WO2019095944A1 - 通信方法及其终端设备、网络设备 - Google Patents

通信方法及其终端设备、网络设备 Download PDF

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Publication number
WO2019095944A1
WO2019095944A1 PCT/CN2018/111552 CN2018111552W WO2019095944A1 WO 2019095944 A1 WO2019095944 A1 WO 2019095944A1 CN 2018111552 W CN2018111552 W CN 2018111552W WO 2019095944 A1 WO2019095944 A1 WO 2019095944A1
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WIPO (PCT)
Prior art keywords
carrier
uplink
random access
uplink carrier
terminal device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/111552
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English (en)
French (fr)
Inventor
严乐
袁世通
曾清海
彭文杰
耿婷婷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to RU2020119784A priority Critical patent/RU2775832C2/ru
Priority to CN201880073663.2A priority patent/CN111357359B/zh
Priority to KR1020207017214A priority patent/KR102429670B1/ko
Priority to CA3082918A priority patent/CA3082918A1/en
Priority to JP2020526928A priority patent/JP7131751B2/ja
Priority to BR112020009695-4A priority patent/BR112020009695A2/pt
Priority to EP18877862.5A priority patent/EP3709735B1/en
Publication of WO2019095944A1 publication Critical patent/WO2019095944A1/zh
Priority to US16/875,192 priority patent/US11419152B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present application relates to the field of communications, and more specifically to a communication method in the field of communications, as well as a terminal device and a network device.
  • a conventional cell is composed of one downlink carrier and one uplink carrier, and the frequency of the uplink carrier and the downlink carrier are the same or similar in the conventional cell.
  • the new radio (NR) system when the high frequency cell is deployed, the operating frequency band in the high frequency cell is higher and the transmitting power of the terminal device is lower, so that the terminal device in the cell edge area can receive the cell.
  • one or more additional lower frequency uplink frequency bands may be introduced to send uplink signals in addition to the original high frequency uplink frequency band of the cell, and we may call the lower frequency uplink frequency band as supplementary uplink ( Supplemental Uplink (SUL) carrier, because the additional uplink frequency band has smaller signal attenuation, which can improve uplink coverage and make the uplink and downlink coverage consistent.
  • SUL Supplemental Uplink
  • the uplink frequency band of 1.8G and 3.5G can be adopted, and the 3.5G frequency band is adopted for the downlink, but it is not limited thereto, and a deployment scheme of other frequency bands can also be adopted. Therefore, when there are multiple uplink frequency bands in a cell, how to select a carrier (ie, select a resource) when the terminal device accesses the cell, and how the network device performs resource configuration is an urgent problem to be solved.
  • the present application provides a communication method, a terminal device, and a network device, which are capable of selecting an uplink carrier for random access in a cell supporting multiple uplink frequency bands.
  • a communication method comprising:
  • the terminal device receives the indication information that is sent by the network device, where the indication information is used to indicate resource configuration information of the at least one uplink carrier, where the at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, where The first uplink carrier and the at least one second uplink carrier are different uplink carriers in a cell of the network device, and the first uplink carrier and the at least one second uplink carrier correspond to the cell.
  • the terminal device determines, according to the resource configuration information of the at least one uplink carrier, an uplink carrier as the target carrier in the at least one uplink carrier for random access.
  • the first uplink carrier and the at least one second uplink carrier are included in the cell (ie, the target cell) of the network device to which the terminal device is to be switched, and the first uplink carrier and the at least one
  • the network device may send, to the terminal device, resource configuration information including at least one uplink carrier of the first uplink carrier and/or the at least one second uplink carrier, so that the terminal
  • the device may determine, according to the resource configuration information of the at least one uplink carrier, that one uplink carrier is used as the target carrier for random access in the at least one uplink carrier.
  • the communication method of the embodiment of the present application can be applied to a scenario of switching scenarios and dual connectivity.
  • the network device in the handover scenario, is a target network device, and the indication information may be included in the handover request response message and the handover message.
  • the network device in the dual connectivity scenario, is a secondary base station, and the indication information may be included in the secondary station addition request acknowledgement message and the RRC connection reconfiguration message.
  • the first uplink carrier and the second uplink carrier are uplink carriers of different frequency bands, respectively.
  • the first uplink carrier may be an uplink carrier of a high frequency band deployed in a 5G NR system, and the uplink carrier may be referred to as an NR UL carrier, a PUL carrier, a Normal UL carrier, or a common UL carrier.
  • the second uplink carrier is an uplink carrier of another low frequency band (such as an LTE system or other communication system), and may be used for an auxiliary terminal device to perform uplink transmission, and the uplink carrier may be referred to as a SUL carrier.
  • the indication information is carried by a reconfiguration message for performing synchronization, where the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier and configuration information of the second uplink carrier, Or the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier or configuration information of the second uplink carrier.
  • the configuration information of the first uplink carrier includes a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal (SRS) configuration, and an uplink of the first uplink carrier.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • the configuration information of the second uplink carrier includes a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, and a sounding reference signal (SRS) of the second uplink carrier At least one of configuration and uplink power control configuration.
  • the resource configuration information includes a dedicated random access resource
  • the terminal device determines, according to the resource configuration information of the at least one uplink carrier, that one uplink carrier is used as a target carrier for random connection in the at least one uplink carrier.
  • the terminal device Determining, by the terminal device, the at least one uplink carrier corresponding to the dedicated random access resource according to the indication information.
  • the terminal device determines the uplink carrier as the target carrier.
  • the terminal device determines one of the at least two uplink carriers as the target carrier.
  • the terminal device uses the dedicated random access resource to perform non-contention based random access. And specifically, when the number of uplink carriers corresponding to the dedicated random access resource is one, the terminal device performs random access on the uplink carrier by using the dedicated random access resource.
  • the dedicated random access resource corresponds to more than one uplink carrier, the terminal device performs random access on one of the at least two uplink carriers by using the dedicated random access resource.
  • the indication information includes a carrier index corresponding to the dedicated random access resource.
  • the determining, by the terminal device, the at least one uplink carrier corresponding to the dedicated random access resource according to the indication information including:
  • the carrier index can explicitly indicate which uplink carrier or carriers are associated with the dedicated random access resource.
  • the dedicated random access resource has a corresponding relationship with an uplink carrier configured with a physical uplink control channel PUCCH resource.
  • the determining, by the terminal device, the at least one uplink carrier corresponding to the dedicated random access resource according to the indication information including:
  • the indication information may implicitly indicate which uplink carrier or the uplink carrier the dedicated random access resource corresponds to by indicating the correspondence between the dedicated random access resource and the uplink carrier configured with the PUCCH resource.
  • the resource configuration information further includes a PUCCH resource
  • the terminal device determines one of the at least two uplink carriers as the target carrier, including:
  • the terminal device determines one of the uplink carriers configured with the PUCCH resources in the at least two uplink carriers as the target carrier.
  • the terminal device may determine at least two uplink carriers corresponding to the dedicated random access resource according to the foregoing manner, and then configure the at least two uplink carriers.
  • the uplink carrier with the PUCCH resource is determined as the target carrier.
  • the resource configuration information further includes a universal random access resource, where the method further includes:
  • the terminal device performs non-contention based random access failure on the target carrier by using the dedicated random access resource, the terminal device uses the universal random access resource on the target carrier or different from the Contention-based random access is performed on another uplink carrier of the target carrier.
  • the resource configuration information includes a PUCCH resource
  • the terminal device determines, according to the resource configuration information of the at least one uplink carrier, an uplink carrier as the target carrier, and performs random access, including :
  • the terminal device determines one of the uplink carriers configured with the PUCCH resource in the at least one uplink carrier as the target carrier.
  • the terminal device may determine one of the at least one carrier configured with the PUCCH resource as the target carrier, and Contention based random access is performed on the uplink carrier using a universal random access resource.
  • the terminal device determines the uplink carrier configured with the PUCCH resource as the target carrier.
  • the terminal device determines the target carrier according to the measurement result of the cell.
  • the resource configuration information includes a universal random access resource
  • the terminal device determines, according to the resource configuration information of the at least one uplink carrier, an uplink carrier as the target carrier in the at least one uplink carrier, and performs random connection.
  • the terminal device determines, according to the resource configuration information of the at least one uplink carrier, an uplink carrier as the target carrier in the at least one uplink carrier, and performs random connection.
  • the terminal device determines the target carrier in the at least one uplink carrier according to a measurement result of the cell.
  • the network device does not adopt the above
  • the explicit or implicit method described indicates which uplink carrier or carriers are associated with the dedicated random access resource.
  • the indication information sent by the network device may indicate a universal random access resource of the at least one uplink carrier.
  • the terminal device may determine the target carrier in at least one uplink carrier according to the measurement result of the cell.
  • the measurement result of the cell includes a measurement result of the downlink reference signal
  • the downlink reference signal may include a synchronization signal (SS) (wherein the SS includes a primary synchronization signal PSS/secondary synchronization signal SSS) and/or a channel state information reference signal ( Channel State Information Reference Signal (CSI-RS) reference signal and/or Physical Broadcast Channel-Demodulation Reference Signal (PBCH-DMRS) signal.
  • SS synchronization signal
  • CSI-RS Channel State Information Reference Signal
  • PBCH-DMRS Physical Broadcast Channel-Demodulation Reference Signal
  • the terminal device determines the target carrier according to the measurement result of the cell, including:
  • the terminal device determines the first uplink carrier as the target carrier.
  • the terminal device determines the second uplink carrier as the target carrier.
  • the reconfiguration message for performing synchronization further includes the threshold, where the threshold is used by the terminal device to determine the target carrier according to a measurement result of a downlink reference signal.
  • the following three manners may be used to configure the threshold:
  • the threshold may be included in the system message of the target network device.
  • the system message is for example RMSI.
  • the threshold value used in the present application may be the same threshold value as that used in the initial access, that is, the threshold value included in the system message is unique, and may be applicable to the uplink carrier selection at the initial access or to the handover. Uplink carrier selection. Or the threshold may be different from the threshold used in the initial access, that is, the system message includes two thresholds, one for uplink carrier selection during initial access and the other for uplink carrier selection at handover. It can be understood that, at this time, the threshold is not included in the handover message in the embodiment of the present application. At this time, the terminal device may perform uplink carrier selection according to the threshold included in the system message broadcast by the target network device.
  • the threshold value may be included in the handover message sent by the source network device to the terminal device.
  • the threshold may be included in the RMSI, and the RMSI may optionally be included in the handover message.
  • the manner in which the RMSI includes the threshold may be as described in the above manner 1).
  • the terminal device may perform uplink carrier selection according to the threshold included in the handover message.
  • the size of the threshold can be specified in the protocol.
  • the terminal device performs random access on another uplink carrier different from the target carrier, where X, Y, and Z are respectively greater than A positive integer of 1.
  • an embodiment of the present application provides a communication method, including:
  • the network device determines first indication information, where the first indication information is used to indicate resource configuration information of the at least one uplink carrier, where the at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, where The first uplink carrier and the at least one second uplink carrier are different uplink carriers in one cell of the network device, and the first uplink carrier and the at least one second uplink carrier correspond to the cell One of the downlink carriers.
  • the network device sends the first indication information, so that the terminal device determines one uplink carrier as the target carrier for random access in the at least one uplink carrier.
  • the cell (ie, the target cell) of the network device to which the terminal device is to be switched includes the first uplink carrier and the at least one second uplink carrier, and the first uplink carrier and the at least one
  • the network device may send, to the terminal device, resource configuration information including at least one uplink carrier of the first uplink carrier and/or the at least one second uplink carrier, so that the terminal device And determining, according to the resource configuration information of the at least one uplink carrier, one uplink carrier as the target carrier for performing random access in the at least one uplink carrier.
  • the communication method of the embodiment of the present application can be applied to a scenario of switching scenarios and dual connectivity.
  • the network device in the handover scenario, is a target network device, and the indication information may be included in the handover request response and the handover message.
  • the network device in the dual connectivity scenario, is a secondary base station, and the indication information may be included in the secondary station addition request acknowledgement message and the RRC connection reconfiguration message.
  • the first uplink carrier and the second uplink carrier are uplink carriers of different frequency bands, respectively.
  • the first uplink carrier may be an uplink carrier of a high frequency band deployed in a 5G NR system, and the uplink carrier may be referred to as an NR UL carrier, a PUL carrier, a Normal UL carrier, or a common UL carrier.
  • the second uplink carrier is an uplink carrier of another low frequency band (such as an LTE system or other communication system), and may be used for an auxiliary terminal device to perform uplink transmission, and the uplink carrier may be referred to as a SUL carrier.
  • the first indication information is used to indicate resource configuration information of the target carrier.
  • the determining, by the network device, the first indication information includes: receiving, by the network device, a measurement result of the terminal device to the cell.
  • the network device determines the target carrier in the at least one uplink carrier according to the measurement result.
  • the measurement result includes a measurement result of the downlink reference signal, where the network device determines the target carrier in the at least one uplink carrier according to the measurement result, including:
  • the network device determines the first uplink carrier in the at least one uplink carrier as the target carrier.
  • the network device determines the second uplink carrier in the at least one uplink carrier as the target carrier.
  • the target network device may configure a dedicated random access resource for one of the uplink carriers.
  • the target network device may not configure any dedicated random access resources, but configure PUCCH resources for one of the uplink carriers.
  • the resource configuration information includes a dedicated random access resource and/or a PUCCH resource.
  • the first indication information includes a carrier index corresponding to the dedicated random access resource, and a carrier index corresponding to the dedicated random access resource is used to indicate at least one uplink carrier corresponding to the dedicated random access resource;
  • the dedicated random access resource has a corresponding relationship with an uplink carrier configured with a physical uplink control channel PUCCH resource, and the corresponding relationship is used to indicate at least one uplink carrier corresponding to the dedicated random access resource.
  • the first indication information further includes a universal random access resource.
  • the target network device supports two uplink carriers (one common UL carrier and one SUL carrier), and each of the two uplink carriers is configured with a dedicated random access resource.
  • the target network device supports two uplink carriers (one common UL carrier and one SUL carrier), and the target network device does not configure any dedicated random access resources for the two uplink carriers, but configures PUCCH for the two uplink carriers respectively. Configuration.
  • the target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the target network device configures dedicated random access resources for all uplink carriers.
  • the target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device configures the uplink carrier for one or a part of the uplink carrier (ie, part of the at least two uplink carriers) Random access resources.
  • the target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device does not configure any dedicated random access resources, but configures a PUCCH configuration for each uplink carrier.
  • the target network device supports more than two uplink carriers, and the target network device is not configured with any dedicated random access resources, but is configured for PUCCH of one or a part of the uplink carriers.
  • the network device sends the second indication information to the terminal device, where the second indication information is used to indicate that the terminal device initiates X times of random connection in a manner that adopts power ascending order on the target carrier.
  • the terminal device After the entry, or after the terminal device initiates a random access failure Y times on the target carrier, or after the terminal device sends a random access preamble sequence Z times on the target carrier, the terminal The device performs random access on another uplink carrier different from the target carrier, where X, Y, and Z are positive integers greater than 1, respectively.
  • a terminal device for performing the method of any of the above first aspect or any of the possible implementations of the first aspect.
  • the terminal device comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.
  • a network device for performing the method of any of the foregoing second aspect or any of the possible implementations of the second aspect.
  • the apparatus comprises means for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect.
  • a terminal device comprising: a transceiver, a memory, a processor, and a bus system.
  • the transceiver, the memory and the processor are connected by the bus system
  • the memory is for storing instructions for executing instructions stored by the memory to control the transceiver to receive and/or transmit signals
  • the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any of the possible implementations of the first aspect.
  • a network device comprising: a transceiver, a memory, a processor, and a bus system.
  • the transceiver, the memory and the processor are connected by the bus system
  • the memory is for storing instructions for executing instructions stored by the memory to control the transceiver to receive signals and/or transmit signals
  • the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of any of the possible implementations of the second aspect or the second aspect.
  • a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of any of the possible implementations of any of the above aspects.
  • a computer program product comprising: computer program code, a communication unit, a processing unit or a transceiver when the computer program code is communicated by a communication device (eg, a terminal device or a network device) And when the processor is running, causing the communication device to perform the method in any of the possible implementations of any of the above aspects.
  • a communication device eg, a terminal device or a network device
  • a communication chip in which instructions are stored which, when executed on a communication device, cause the communication chip to perform the method of any of the possible implementations of any of the above aspects.
  • a communication system comprising the above terminal device and a network device.
  • FIG. 1 is a schematic diagram of cell deployment in an NR system according to an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of another communication method according to an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of another communication method according to an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of another communication method according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of another communication method according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a terminal device according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another terminal device according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a network device according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of another network device according to an embodiment of the present application.
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • 5G future 5th Generation
  • NR New Radio
  • the terminal device in the embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or User device.
  • the terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the network device in the embodiment of the present application may be a device for communicating with the terminal device, and may be an evolved base station (Evolutional NodeB, eNB or eNodeB) in the LTE system, or may be a cloud radio access network. , CRAN) wireless controller, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, for example, for example
  • the base station device gNB in the NR system may be used in the embodiment of the present application.
  • the source network device in the embodiment of the present application refers to an access network device that the terminal currently accesses or camps on, and the terminal will switch from the access network device to other access network devices.
  • the target network device in the embodiment of the present application refers to an access network device to which the terminal will be handed over.
  • Multiple appearing in the embodiments of the present application means two or more.
  • connection in the embodiment of the present application refers to various connection modes such as a direct connection or an indirect connection, so as to implement communication between devices, which is not limited in this embodiment.
  • FIG. 1 is a schematic diagram of a cell deployment in an NR system according to an embodiment of the present application.
  • the area 1 in FIG. 1 is the downlink coverage of the high frequency cell
  • the area 2 is the uplink coverage of the high frequency cell
  • the size of the area 1 and the area 2 is asymmetric, and the coverage of the area 2 is smaller than the area 1 Coverage.
  • the transmission power of the network device is basically not limited. Therefore, the network device can use a larger transmission power transmission to improve the range of downlink coverage.
  • the terminal device is limited by the maximum transmit power and the like, and the uplink coverage is not improved by increasing the transmit power. Therefore, the uplink coverage of the high-frequency cell is inconsistent with the downlink coverage.
  • the downlink carrier in the area 1 may be an NR Downlink (NR DL) carrier
  • the uplink carrier in the area 2 is an NR Uplink (NR UL) carrier, PUL.
  • Carrier, Normal UL carrier or common UL carrier or Non SUL carrier To describe the method, the following will be described in terms of a common UL carrier.
  • the area 3 in FIG. 1 is the coverage of the SUL carrier, and the coverage of the area 3 is the same or similar to the coverage of the area 1.
  • the SUL carrier has an uplink frequency band lower than the common UL carrier, so that the signal attenuation is smaller in this area, and the terminal device can transmit with a lower transmission power.
  • the terminal device has two segments of spectrum for uplink transmission, that is, the terminal device can use the SUL carrier and the common UL carrier for uplink transmission, that is, the cell supporting the SUL configuration has one downlink carrier and two uplink carriers.
  • the embodiment of the present application is only described by using the application scenario in FIG. 1 as an example.
  • the embodiment of the present application is not limited thereto.
  • the cell may further include other SUL carriers, that is, terminals in a cell supporting SUL configuration.
  • the device can use one common UL carrier and at least one SUL carrier for uplink transmission.
  • FIG. 2 is a flowchart of an interaction of a communication method provided by an embodiment of the present application.
  • the communication method may be used in a process in which a terminal device switches from a source gNB to a target gNB.
  • the embodiment of the present application is described by taking the NR system as an example, but the technical solution of the embodiment of the present application is not limited to the 5G system.
  • the network device/terminal device may perform some or all of the steps in the foregoing embodiments, and the steps or operations are merely examples, and the embodiments of the present invention may also perform other operations or modifications of various operations. Further, the various steps may be performed in a different order as presented in the above embodiments, and it is possible that not all of the operations in the above embodiments are performed.
  • the network device sends indication information to the terminal device, where the indication information is used to indicate resource configuration information of the at least one uplink carrier.
  • the network device is a target network device or a source network device, where the target network device may be a target base station, that is, the target gNB, and the source network device may be a source base station, that is, the source gNB.
  • the indication information may be included in the handover request acknowledgement message sent by the target network device to the source network device, and the source network device sends the handover message to the terminal device, where the handover message includes the indication information.
  • the target network device may first send the indication information to the source network device, and then the source network device transparently transmits the indication information to the terminal device.
  • the indication information may be included in the handover response confirmation message and the handover message.
  • the handover message may be a Radio Resource Control (RRC) connection reconfiguration message including mobility control information, or other used to indicate that the terminal device performs handover/change of serving cell/synchronization reconfiguration. Message.
  • RRC Radio Resource Control
  • the terminal device reports the measurement report to the source network device, and the source network device performs a handover decision according to the measurement report reported by the terminal device or according to other information, and determines the target cell to be handed over. Then, sending a handover request message to the network device (ie, the target network device) to which the target cell belongs, and the target network device performs the admission control (for example, configuring the resource) according to the received handover request message, and then returns the handover to the source network device. After the acknowledgment message is requested, the source network device sends a handover message to the terminal device after receiving the handover request acknowledgement message.
  • the network device ie, the target network device
  • the target network device performs the admission control (for example, configuring the resource) according to the received handover request message, and then returns the handover to the source network device.
  • the source network device sends a handover message to the terminal device after receiving the handover request acknowledgement message.
  • the at least one uplink carrier is an uplink carrier in a target cell to which the terminal device is to be handed over, that is, an uplink carrier in a cell of the target network device to which the terminal device is to be handed over.
  • the at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, where the first uplink carrier and the at least one second uplink carrier are in a target cell to be switched by the terminal device.
  • Different uplink carriers, and the first uplink carrier and the at least one second uplink carrier correspond to one downlink carrier in the target cell.
  • the first uplink carrier and the second uplink carrier are uplink carriers of different frequency bands, respectively.
  • the first uplink carrier may be an uplink carrier of a high frequency band deployed in the NR system, that is, an NR UL carrier, a PUL carrier, a Normal UL carrier, or a common UL carrier described above.
  • the second uplink carrier is an uplink carrier of another low frequency band (such as an LTE system or other communication system), and can be used for the auxiliary terminal device to perform uplink transmission, that is, the SUL carrier described above. Therefore, in the embodiment of the present application, the terminal device may have two segments of spectrum for uplink transmission, and the coverage of the first uplink carrier is smaller than the coverage of the second uplink carrier.
  • the description of the coverage of the first uplink carrier and the coverage of the second uplink carrier may be referred to in FIG. 1 . To avoid repetition, details are not described herein again.
  • the target cell is configured with a downlink carrier, a first uplink carrier, and at least one second uplink carrier, where the first uplink carrier and the at least one second uplink carrier correspond to the A downlink carrier in the target cell may be understood as the coverage of the downlink carrier being the same as or similar to the coverage of one of the at least one SUL carrier corresponding to the downlink carrier.
  • the coverage of the downlink carrier is the same or similar to the coverage of the SUL carrier.
  • the downlink carrier is the same as or similar to the frequency band of the first uplink carrier, and the at least one second uplink carrier is used to assist the terminal device to perform uplink transmission, and the frequency band may be lower than the downlink carrier or the first uplink. Carrier.
  • the indication information is carried by a reconfiguration message for performing synchronization, where the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier and configuration information of the second uplink carrier, Or the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier or configuration information of the second uplink carrier.
  • the configuration information of the first uplink carrier includes a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal (SRS) configuration, and an uplink of the first uplink carrier.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • the configuration information of the second uplink carrier includes a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, and a sounding reference signal (SRS) of the second uplink carrier At least one of configuration and uplink power control configuration.
  • the resource configuration information includes a dedicated random access resource (dedicated RACH resource), and the dedicated random access resource may be used by the terminal device to initiate contention-free random access (contention-free random access, contention-free RA/ CFRA), specifically, the dedicated random access resource includes a preamble index and a time-frequency resource.
  • the dedicated random access resource includes a preamble index and a time-frequency resource.
  • the target network device may simultaneously allocate the same dedicated random access resource to one common UL carrier and/or at least one SUL carrier.
  • the target network device may configure a dedicated random access resource for the common UL carrier and/or the at least one SUL carrier, respectively.
  • the indication information may include a carrier index corresponding to the dedicated random access resource.
  • the carrier index may indicate the corresponding relationship between the random access resource and the uplink carrier, that is, the index number of the uplink carrier corresponding to the dedicated random access resource.
  • the terminal device can determine the uplink carrier corresponding to the dedicated random access resource according to the carrier index corresponding to the dedicated random access resource.
  • the index value of the SUL carrier is 1.
  • the system message or the RRC signaling or protocol specifies (ie, the protocol writes) the index value of the carrier, and the indication information may include A dedicated random access resource, where the configuration information element of the dedicated random access resource includes a carrier index value of 1.
  • the indication information is used to indicate that the uplink carrier corresponding to the dedicated random access resource is the SUL carrier #1.
  • the indication information may include a dedicated random access resource #1, the carrier index of the dedicated random access resource #1 is 0, 2, 3, and the carrier index 0, 2, 3 respectively correspond to the common UL carrier, SUL Carrier #1 and SUL carrier #3.
  • the indication information is used to indicate that the uplink carrier corresponding to the dedicated random access resource #1 is a common UL carrier, a SUL carrier #1, and a SUL carrier #3, that is, the target network device is a common UL carrier, a SUL carrier #1, and a SUL.
  • Carrier #3 is assigned the same dedicated random access resource #1.
  • the indication information includes a dedicated random access resource. 1, #2, #3, wherein: the configuration cell of the dedicated random access resource #1 includes a carrier index value 1, that is, the indication information is used to indicate that the uplink carrier corresponding to the dedicated random access resource #1 is a common UL carrier.
  • the configuration information element of the dedicated random access resource #2 includes the carrier index value 2, that is, the indication information is used to indicate that the uplink carrier corresponding to the dedicated random access resource #2 is the SUL carrier #2; the dedicated random access resource
  • the configuration information of the #3 includes a carrier index value of 4, that is, the indication information is used to indicate that the uplink carrier corresponding to the dedicated random access resource #3 is the SUL carrier #4.
  • the resource configuration information may further include a PUCCH resource.
  • the dedicated random access resource may have a corresponding relationship with the uplink carrier configured with the physical uplink control channel PUCCH resource, that is, the dedicated random access resource corresponds to the uplink carrier configured with the PUCCH resource. That is, the indication information may implicitly indicate which uplink carriers the dedicated random access resource corresponds to.
  • the indication information may include the dedicated random access resource #1, and the network device configures the PUCCH resource for the common UL carrier, the SUL carrier #1, and the SUL carrier #3, and the network device indicates the dedicated random connection by the implicit manner.
  • the uplink carriers corresponding to the incoming resource #1 are the common UL carrier, the SUL carrier #1, and the SUL carrier #3, that is, the target network device allocates the dedicated random access resource #1 for the common UL carrier, the SUL carrier #1, and the SUL carrier #3. .
  • a cell manner such as ra-PRACH-MaskIndex
  • a cell manner such as ra-PRACH-MaskIndex
  • ra-PRACH-MaskIndex may be used to indicate which uplink carrier the dedicated random access resource corresponds to, for example, using a reserved index in the maskindex.
  • a ra-PRACH-MaskIndex may be included in the dedicated random access resource, where the dedicated random access resource configuration information is included in the handover message.
  • the number of mask indexes in the ra-PRACH-MaskIndex may be extended, and an extended mask index is used to indicate which uplink carrier the dedicated random access resource corresponds to.
  • the existing mask index is only 0 to 15, which can be directly specified in the protocol to indicate which mask index is used.
  • the ra-PRACH-MaskIndex may be used to indicate the correspondence between the dedicated random access resource and the uplink carrier.
  • the mask index may be used to correspond to the carrier index.
  • the dedicated random access resource may correspond to any one of the uplink carriers.
  • the target network device can allocate dedicated random access resources for at least one uplink carrier.
  • the terminal device may determine, according to the indication information, at least one uplink carrier corresponding to the dedicated random access resource.
  • the resource configuration information may include a universal random access resource, where the universal random access resource may be used by the terminal device to initiate a contention-based RA (CBRA).
  • the handover message may include a random access channel (RACH) configuration, and the universal random access resource may be included in the RACH configuration.
  • RACH random access channel
  • the universal random access resource corresponds to one common UL carrier and/or at least one SUL carrier.
  • Another possible way is to have multiple universal random access resources corresponding to one common UL carrier and/or at least one SUL carrier.
  • the terminal device preferentially initiates random access on the dedicated random access resource.
  • the terminal device may initiate random access on the universal random access resource.
  • the terminal device determines, according to the resource configuration information of the at least one uplink carrier, that one uplink carrier is used as the target carrier for random access in the at least one uplink carrier. That is, the target carrier is the first uplink carrier or the second uplink carrier in the above, that is, the target carrier is one uplink carrier in the target cell to which the terminal device is to be handed over, that is, the target carrier is a common UL carrier or a SUL carrier. .
  • the terminal device may determine, according to the indication information, the at least one uplink carrier corresponding to the dedicated random access resource.
  • the terminal device determines, as the at least one uplink carrier corresponding to the dedicated random access resource, the carrier indicated by the carrier index corresponding to the dedicated random access resource.
  • the terminal device determines, according to the correspondence between the dedicated random access resource and the uplink carrier configured with the PUCCH resource, the uplink carrier configured with the PUCCH resource to determine at least one uplink carrier corresponding to the dedicated random access resource.
  • the terminal device may determine, according to the Mask Index indication bit in the ra-PRACH-MaskIndex, the at least one uplink carrier corresponding to the dedicated random access resource.
  • the terminal device may default that the dedicated random access resource may correspond to any one of the uplink carriers.
  • the terminal device determines the uplink carrier as the target carrier, and initiates random connection on the target carrier.
  • the target network device configures a dedicated random access resource for only one uplink carrier (ie, a common UL carrier or a SUL carrier), and the terminal device initiates a random connection by using a dedicated random access resource corresponding to the uplink carrier.
  • the terminal device determines one of the at least two uplink carriers as the target carrier, and uses The dedicated random access resource initiates random access on the target carrier. That is, at this time, the target network device configures a dedicated random access resource for a plurality of uplink carriers (ie, one common UL carrier and/or at least one SUL carrier).
  • the terminal device may determine the target carrier according to the PUCCH resource in the resource configuration information. Specifically, the terminal device may determine one of the uplink carriers configured with the PUCCH resources in the at least two uplink carriers as the target carrier.
  • the terminal device adopts a carrier configured with the dedicated random access resource and the PUCCH resource.
  • the corresponding dedicated random access resources are randomly accessed.
  • the target network device configures a plurality of uplink carriers in the uplink carrier configured with the dedicated random access resource with the PUCCH resource
  • the terminal device may adopt and configure the dedicated random access resource and the multiple uplink carriers on the PUCCH resource.
  • a dedicated random access resource corresponding to an uplink carrier performs random access.
  • the terminal device determines one of the uplink carriers configured with the PUCCH resource in the at least one uplink carrier as the target carrier. Specifically, at this time, the dedicated random access resource is not included in the handover request response or the handover message, and the universal random access resource is included in the handover request response or the handover message, and the PUCCH of the uplink carrier is included in the indication information. For the resource, the terminal device uses the universal random access resource to perform contention-based random access on the uplink carrier configured with the PUCCH resource. If the handover request response or the handover message includes the PUCCH resource configured for the multiple uplink carriers, the terminal device may use the universal random access resource to perform the contention-based randomization on one of the plurality of uplink carriers configured on the PUCCH resource. Access.
  • the terminal device may randomly select one uplink carrier as the target carrier in the at least two uplink carriers configured with the PUCCH resources. Performing random access, or the terminal device may be selected according to the order of configuration of the network device, for example, the terminal device may configure the first one of the indication information with an uplink carrier configured with a PUCCH resource (or configured with a dedicated random access resource and a PUCCH resource) It is determined that the target carrier is randomly accessed.
  • the terminal device when the number of uplink carriers configured with the PUCCH resource is at least two, the terminal device is in the at least two uplink carriers configured with PUCCH resources according to the measurement result of the target cell. Determining the target carrier.
  • the resource configuration information includes a universal random access resource
  • the terminal device determines an uplink carrier in the at least one uplink carrier according to the resource configuration information of the at least one uplink carrier.
  • Performing random access as the target carrier includes: determining, by the terminal device, the target carrier in the at least one uplink carrier according to a measurement result of the target cell.
  • the network device does not adopt the above
  • the explicit or implicit method described indicates which uplink carrier or carriers are associated with the dedicated random access resource.
  • the indication information sent by the network device may indicate a universal random access resource of the at least one uplink carrier.
  • the terminal device may determine the target carrier in at least one uplink carrier according to the measurement result of the target cell.
  • the measurement result of the cell is a cell-level measurement result of the cell and/or a signal measurement result of the cell, where the signal measurement result includes a measurement result of the downlink reference signal.
  • the downlink reference signal may include an SS (including a primary synchronization signal PSS/secondary synchronization signal SSS) and/or a CSI-RS and/or a PBCH-DMRS.
  • the measurement follows the existing cell measurement method, such as the cell measurement technology in the LTE system: the terminal device measures the cell-level measurement result of the serving cell and/or the neighboring cell according to the measurement configuration.
  • the cell-level measurement result may be a measurement result obtained by averaging the measurement results of one or more beams in the cell.
  • the measurement result of the downlink reference signal includes reference signal received power (RSRP) and reference signal received quality (RSRQ).
  • the reconfiguration message for performing synchronization further includes the threshold, where the threshold is used by the terminal device to determine the target carrier according to a measurement result of a downlink reference signal.
  • the following three manners may be used to configure the threshold. It is to be understood that the following three modes are merely illustrative and do not constitute any limitation on the embodiments of the present application.
  • the threshold may be included in the system message of the target network device.
  • the system message is for example RMSI.
  • the threshold for the uplink carrier selection in the initial access is included in the system message, and the threshold in the present application may be the same threshold as that used in the initial access, that is, the threshold included in the system message. It is unique and can be applied to the uplink carrier selection at the time of initial access or the uplink carrier selection at the time of handover. Or the threshold may be different from the threshold used in the initial access, that is, the system message includes two thresholds, one for uplink carrier selection during initial access and the other for uplink carrier selection at handover.
  • the threshold is not included in the handover message in the embodiment of the present application.
  • the terminal device may perform uplink carrier selection according to a threshold included in a system message broadcast by the target network device.
  • the threshold value may be included in the handover message sent by the source network device to the terminal device.
  • the threshold may be included in the RMSI, and the RMSI may be optionally included in the handover message.
  • the manner in which the RMSI includes the threshold may be as described in the foregoing manner 1).
  • the terminal device may perform uplink carrier selection according to the threshold included in the handover message.
  • the size of the threshold may be pre-configured to the terminal device.
  • the terminal device determines the first uplink carrier as the target carrier. And if the measurement result of the downlink reference signal is less than the threshold, the terminal device determines the second uplink carrier as the target carrier.
  • the first uplink carrier is the common UL carrier in the above
  • the second uplink carrier is the SUL carrier in the above.
  • the terminal device can perform the selection of the uplink carrier by using the following two methods. It is to be understood that the following two modes are merely illustrative and do not constitute any limitation on the embodiments of the present application.
  • the terminal device performs random access on the first uplink carrier. If the RSRP or RSRQ is less than the threshold, the terminal device performs random access on the second uplink carrier.
  • the at least two uplink carriers are the first uplink carrier and at least two second uplink carriers.
  • the terminal device performs random access on the first uplink carrier.
  • the terminal device performs random access on any one of the at least two second uplink carriers.
  • the terminal device may determine one uplink carrier to perform random access among the multiple uplink carriers according to the two thresholds and the measurement result.
  • the network device may indicate a correspondence between the two thresholds and an uplink carrier selection (which may also be a protocol specification, or an indication in a system message or a handover message).
  • the two thresholds may be a first threshold (threshold 1) and a second threshold (threshold 2), which may include common UL1, SUL1, and SUL2.
  • the RSRP or the RSRQ is less than threshold 1
  • the terminal device selects SUL1 for random access.
  • the terminal device selects SUL2 for random access
  • the terminal device Select common UL1 for random access.
  • the terminal device may use the universal random access resource on the target carrier or different Contention based random access is performed on another uplink carrier of the target carrier.
  • the another uplink carrier may be an uplink carrier other than the target carrier, and optionally, the other uplink carrier may be configured with a PUCCH resource.
  • the terminal device may use the universal random access resource to initiate contention-based random access (CBRA) on the target carrier.
  • CBRA contention-based random access
  • the handover message may further include second indication information, where the second indication information is used to indicate that the terminal device initiates power ramping on the target carrier.
  • the second indication information is used to indicate that the terminal device initiates power ramping on the target carrier.
  • X times of random access ie, when the terminal device performs X-1 power ramping on the target carrier
  • the terminal device initiates random access failure on the target carrier for Y times
  • the terminal device transmits a random access preamble (Z) times on the target carrier
  • the terminal device performs random access on another uplink carrier different from the target carrier, where , X, Y, and Z are positive integers greater than 1, respectively.
  • the terminal device when the terminal device initiates random access by using a power ramping manner on the target carrier, when the terminal device performs random access for the first time, the terminal device may perform random access by using a lower transmit power.
  • the terminal device may increase the transmit power by using the first step, and then perform the second random access on the target carrier with the increased transmit power.
  • the terminal device After the terminal device increases the transmission power by X-1 times in the above manner (that is, X times of random access is performed), the terminal device may perform random access on another uplink carrier different from the target carrier.
  • Y may be the maximum number of times the random access failure is initiated by the protocol.
  • Y may also be a number of times indicated by the second indication information, which may be less than or equal to the maximum number of times the protocol initiates a random access failure.
  • the case that the random access is not successful after multiple power ramping in a certain random access process may be regarded as a failure of the random access process, which is not limited in this embodiment of the present application.
  • the terminal device after the terminal device initiates X times of random access in a power ascending manner on the target carrier, or if the terminal device initiates random access failure on the target carrier for Y times, Or after transmitting the random access preamble sequence Z times on the target carrier, the terminal device performs random access on another uplink carrier different from the target carrier.
  • the terminal device before the terminal device performs random access on another uplink carrier different from the target carrier, the terminal device may have performed on the dedicated random access resource or the universal random access resource. Random access failed.
  • the target cell to which the terminal device is to be handed over includes the first uplink carrier and the at least one second uplink carrier, and the first uplink carrier and the at least one second uplink carrier correspond to the target cell.
  • the network device may send the resource configuration information including the at least one uplink carrier of the first uplink carrier and/or the second uplink carrier to the terminal device, so that the terminal device may use the resource configuration information of the at least one uplink carrier. And determining, by using at least one uplink carrier, an uplink carrier as the target carrier for random access.
  • the network device herein may be a target network device or a source network device.
  • the target network device may send a handover request response including the resource configuration information to the source network device, after the source network device receives the handover request response. And initiating a handover message to the terminal device, where the resource configuration information is included in the handover message.
  • FIG. 3 is a schematic diagram of a schematic interaction of another communication method provided by an embodiment of the present application. It should be understood that FIG. 3 illustrates the steps or operations of the communication method, but these steps or operations are merely examples, and other embodiments of the present application may also perform other operations or variations of the operations in FIG. Moreover, the various steps in FIG. 3 may be performed in a different order than that presented in FIG. 3, and it is possible that not all operations in FIG. 3 are to be performed.
  • the terminal device sends a measurement report to the source network device (eg, the source gNB).
  • the source network device eg, the source gNB
  • the terminal device performs measurement on the serving cell and/or the neighboring cell, and sends a measurement report to the source network device, where the measurement report includes measurement results of the serving cell and/or the neighboring cell.
  • the measurement result of the cell can be referred to the description in FIG. 2. To avoid repetition, details are not described herein again.
  • the source network device performs a handover decision according to the measurement report reported by the terminal device or according to other information, and after determining the target cell, sends a handover request message to the network device to which the target cell belongs, that is, the target network device.
  • the source network device sends a handover request to the target network device, where the handover request includes a measurement result reported by the terminal device in the measurement report, where the measurement result includes a measurement result of the target cell, and optionally includes a signal measurement result of the target cell.
  • the measurement result may be included in an RRC container in the handover request message, or the measurement result may also be an interface cell of the Xn interface, and the cell is included in the handover request message.
  • the target network device determines an uplink carrier configuration according to the threshold and the foregoing measurement result.
  • the uplink carrier configuration includes resource configuration information of the at least one uplink carrier.
  • the at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier (ie, a common UL carrier and at least one SUL carrier).
  • first uplink carrier and the second uplink carrier may be referred to in the foregoing description. To avoid repetition, details are not described herein again.
  • the uplink carrier configuration includes resource configuration information of an uplink carrier, where the resource configuration information may include a dedicated random access resource and/or a PUCCH resource.
  • the target network device may configure a dedicated random access resource for one of the uplink carriers.
  • the target network device when the measurement result RSRP or RSRQ of the target cell is greater than or equal to a threshold, the target network device configures a dedicated random access resource for the first uplink carrier.
  • the target network device configures a dedicated random access resource for one of the at least one second uplink carrier.
  • the network device may also configure a PUCCH resource for the uplink carrier.
  • the target network device when the target network device supports at least two uplink carriers, the target network device may not configure any dedicated random access resources, but configure PUCCH resources for one of the uplink carriers.
  • the target network device when the measurement result RSRP or RSRQ of the target cell is greater than or equal to a threshold, the target network device configures a PUCCH resource for the first uplink carrier.
  • the target network device configures a PUCCH resource for one of the at least one second uplink carrier when the measurement result RSRP or RSRQ of the target cell is less than a threshold.
  • the target network device supports two uplink carriers (one common UL carrier and one SUL carrier), and each of the two uplink carriers is configured with a dedicated random access resource.
  • the target network device supports two uplink carriers (one common UL carrier and one SUL carrier), and the target network device does not configure any dedicated random access resources for the two uplink carriers, but configures PUCCH for the two uplink carriers respectively. Configuration.
  • the target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the target network device configures dedicated random access resources for all uplink carriers.
  • the target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device configures the uplink carrier for one or a part of the uplink carrier (ie, part of the at least two uplink carriers) Random access resources.
  • the target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device does not configure any dedicated random access resources, but configures a PUCCH configuration for each uplink carrier.
  • the target network device supports more than two uplink carriers, and the target network device is not configured with any dedicated random access resources, but is configured for PUCCH of one or a part of the uplink carriers.
  • the handover message may further include second indication information, where the second indication information is used to indicate that the terminal device initiates power ramping on the target carrier.
  • the second indication information is used to indicate that the terminal device initiates power ramping on the target carrier.
  • X times of random access ie, when the terminal device performs X-1 power ramping on the target carrier
  • the terminal device initiates random access failure on the target carrier for Y times
  • the terminal device performs random access on another uplink carrier different from the target carrier, where X, Y, Z are positive integers greater than 1, respectively.
  • the target network device sends a handover request response to the source network device, where the handover request response includes resource configuration information of the uplink carrier determined by the target network device.
  • the source network device sends a handover message to the terminal device, where the handover message includes resource configuration information of the uplink carrier determined by the target network device.
  • resource configuration information in 340 and 350 can be referred to in the description in 330. To avoid repetition, details are not described herein again.
  • the terminal device After receiving the resource configuration information of the at least one uplink carrier sent by the source network device, the terminal device may have corresponding different behaviors corresponding to different situations of resource configuration.
  • the terminal device may preferentially use the dedicated random access resource corresponding to the carrier to perform random access. If the random access fails, the terminal device continues to perform random access on the carrier using the universal random access resource. And, if the terminal device fails the contention based random access using the universal random access resource on the carrier, the terminal device may use the universal random access resource for competition based on another uplink carrier except the carrier. Random access.
  • the resource configuration information of the at least one uplink carrier does not include any dedicated random access resources
  • only the PUCCH configuration of one of the uplink carriers is included.
  • the user terminal can only perform contention-based random access using the universal random access resource on the uplink carrier where the PUCCH configuration exists. If the contention based random access fails, the terminal device may initiate an RRC connection re-establishment procedure or use the universal random access resource of another uplink carrier for random access.
  • the terminal device may adopt any one of the following four methods:
  • the terminal device makes another decision according to the threshold and the measurement result of the target cell. .
  • the dedicated random access resource corresponding to the first uplink carrier common UL carrier
  • the dedicated random access resource corresponding to the second uplink carrier SUL carrier
  • the terminal device makes another decision according to the threshold value in the RMSI and the measurement result of the target cell.
  • the target network device supports two uplink carriers (NR UL carrier and SUL carrier), the target network device is not configured with any dedicated random access resources, but respectively
  • the two uplink carriers are configured with the PUCCH configuration, and the terminal device can adopt any one of the following four methods:
  • the terminal device makes another decision according to the threshold and the measurement result of the target cell. .
  • the target network device provides another threshold (independent of the threshold for the network side to make a decision, such as the handover request response message and the handover message contains another threshold)
  • the terminal device makes another decision according to the threshold and the measurement result of the target cell. Specifically, when the measurement result RSRP or RSRQ of the downlink signal of the target cell is greater than or equal to the threshold, the universal random access resource corresponding to the first uplink carrier (common UL carrier) is used for random access. If the measurement result of the downlink signal of the target cell, RSRP or RSRQ, is smaller than the threshold, the random access is performed by using the corresponding universal random access resource of the second uplink carrier (SUL carrier). Alternatively, when the handover request response message/handover message is not configured with a threshold, the terminal device makes another decision according to the threshold value in the RMSI and the measurement result of the target cell.
  • the target network device supports more than two uplink carriers (one NR UL carrier and at least one SUL carrier), the target network device is configured with dedicated for all uplink carriers.
  • the terminal device can adopt any of the following four methods:
  • the threshold may include a threshold or a plurality of thresholds .
  • the protocol specifies a threshold, or a threshold is included in the system message or the handover message
  • the measurement result RSRP or RSRQ of the downlink signal of the target cell is greater than or equal to the threshold
  • the random connection corresponding to the first uplink carrier is used. Incoming resources initiate random access.
  • the random access resource of any one of the remaining uplink carriers is used to initiate random access.
  • the network device may indicate the correspondence between the two thresholds and the uplink carrier selection (which may also be in a protocol specification or in a system message or in a handover message). Instructions). For example, all uplink carriers supported by the network device include: common UL1, SUL1, and SUL2, and the multiple thresholds are: threshold 1 and threshold 2. When RSRP or RSRQ is less than threshold1, the terminal device selects SUL1 for random access. When RSRP or RSRQ is greater than threshold 1 and less than threshold 2, the terminal device selects SUL2 for random access. When RSRP or RSRQ is greater than threshold 2, the terminal device selects common UL1 for random access.
  • the target network device supports more than two uplink carriers, and the target network device configures dedicated random access resources for one or more uplink carriers.
  • the terminal device preferentially uses the dedicated random access resource for random access. If there are multiple dedicated random access resources corresponding to multiple uplink carriers, the terminal device may adopt any one of the following three modes:
  • the universal random access resource is used instead to continue random access on the carrier.
  • the terminal device may perform random access according to the second indication information sent by the network device, that is, the terminal device initiates random access on the universal random access resource to perform X times power ramping (upwardly increasing the random access message in a stepwise manner) After 1 transmission power), another uplink carrier is used for random access. Or, after the terminal device initiates random access failure Y times on the universal random access resource, the other uplink carrier is used for random access.
  • the terminal device when the terminal device initiates random access by using the universal random access resource on the uplink carrier configured with the PUCCH resource, the terminal device may adopt the following three manners. Any one:
  • the target network device if the target network device indicates that there are more than two uplink carriers, the target network device does not configure any dedicated random access resources, but configures one or a part of the uplink carriers.
  • the terminal device can adopt any one of the following three methods:
  • the target cell to which the terminal device is to be handed over includes the first uplink carrier and the at least one second uplink carrier, and the first uplink carrier and the at least one second uplink carrier correspond to the target cell.
  • the target network device may determine the resource configuration information of the at least one uplink carrier according to the measurement result and the threshold value sent by the terminal device, and send the resource configuration information to the terminal device, so that the terminal device may be according to the at least one
  • the resource configuration information of the uplink carrier determines, in the at least one uplink carrier, an uplink carrier as the target carrier for random access.
  • FIG. 4 is a schematic diagram of a schematic interaction of another communication method provided by an embodiment of the present application. It should be understood that FIG. 4 illustrates the steps or operations of the communication method, but these steps or operations are merely examples, and other embodiments of the present application may also perform other operations or variations of the operations in FIG. Moreover, the various steps in FIG. 4 may be performed in a different order than that presented in FIG. 4, and it is possible that not all operations in FIG. 4 are to be performed.
  • the target network device eg, Target gNB
  • sends a threshold to the source network device eg, Source gNB
  • the threshold here can be referred to the description of the threshold in the above, and to avoid repetition, details are not described herein again.
  • the terminal device sends a measurement report to the source network device.
  • the measurement report can be referred to the description above, and to avoid repetition, details are not described herein again.
  • step 410 and step 420 may be interchanged, that is, the target network device sending the threshold to the source network device may occur before the terminal device sends the measurement report to the source network device, or the terminal device may send the measurement to the source network device. After the report.
  • the source network device determines the target carrier in the at least one uplink carrier according to the threshold and the measurement result reported by the terminal device.
  • At least one uplink carrier belongs to a target cell of the target network device (ie, a cell to which the terminal device is to be handed over).
  • the at least one uplink carrier includes a first uplink carrier and at least one second uplink carrier, where the target carrier is a first uplink carrier or a second uplink carrier.
  • the first uplink carrier and the target carrier may be referred to in the foregoing description. To avoid repetition, details are not described herein again.
  • the source network device sends a handover request to the target network device, where the handover request includes information about the target carrier determined in 430, that is, the handover request may include indicating that the target network device is the first uplink carrier or the second uplink carrier. Resource configuration information.
  • the target network device performs resource configuration for the first uplink carrier or the second uplink carrier according to the information that is used to indicate that the target network device performs resource configuration for the first uplink carrier or the second uplink carrier, and
  • the source network device sends a handover request response, where the handover request response includes the determined resource configuration information of the target carrier.
  • the source network device sends a handover message to the terminal device.
  • the terminal device may have corresponding different behaviors according to the specific situation of the resource configuration information in the handover message.
  • the specific behavior of the terminal device can be referred to the description above. To avoid repetition, details are not described herein again.
  • the target cell to which the terminal device is to be handed over includes the first uplink carrier and the at least one second uplink carrier, and the first uplink carrier and the at least one second uplink carrier correspond to the target cell.
  • the source network device may determine, according to the measurement result sent by the terminal device and the threshold value sent by the target network device, the at least one uplink carrier that the target network device needs to perform resource configuration, and indicate that the target network device is the determined at least one uplink.
  • the carrier is configured for resources.
  • the target network device performs resource configuration for the determined at least one uplink carrier according to the indication information included in the handover request message, and the determined resource configuration information of the at least one uplink carrier is included in the handover request response message and sent to the source network device.
  • the source network device sends the resource configuration information to the terminal device, so that the terminal device determines, according to the resource configuration information of the at least one uplink carrier, an uplink carrier as the target carrier for random access in the at least one uplink carrier.
  • the handover message may include a bandwidth part (BWP) and an associated cell of the SUL carrier.
  • BWP bandwidth part
  • the handover message may include downlink (DL) configuration information, where the DL configuration information includes DL common configuration information and downlink BWP configuration information.
  • the downlink BWP configuration information includes at least one of the following information: a frequency point, a bandwidth, and a frequency offset.
  • the downlink BWP configuration information may further include a physical information configuration, for example, including at least one of a PDCCH configuration and a PDSCH configuration.
  • the handover message may include uplink UL configuration information.
  • the above uplink carrier includes a common UL carrier and a SUL as an example for description.
  • the system message and the dedicated RRC message may include an index value of a common UL carrier and a SUL carrier, or an index value of a common UL carrier and a SUL carrier directly in the protocol.
  • common UL carrier corresponds to index0
  • SUL carrier corresponds to index1.
  • the handover message may include a dedicated random access channel (RACH) configuration, and the dedicated RACH configuration may be used to indicate the association between the dedicated random access resource and the uplink carrier, such as including the carrier index in the dedicated RACH configured cell.
  • RACH dedicated random access channel
  • the dedicated RACH configuration includes a carrier index value index0.
  • the SUL carrier and the common UL carrier may support one or more BWPs (specifically, the BWP index value may be configured by using a dedicated RRC message or a system message).
  • the common UL carrier supports one or more BWPs
  • the dedicated random access resource corresponds to the BWP1 of the NR UL carrier
  • the dedicated RACH configuration needs to include the BWP index value BWP1 in addition to the carrier index value index0.
  • the terminal device may perform random access by using a dedicated random access resource corresponding to the BWP1 frequency band of the common UL carrier.
  • the handover message may include common configuration information of the common UL carrier and the SUL carrier, and dedicated configuration information of the common UL carrier and the SUL carrier, in addition to the dedicated RACH configuration.
  • the common configuration information may include at least one of a PUCSH configuration, a PUCCH configuration, an SRS configuration, an uplink power control configuration, and the like.
  • the dedicated configuration information may include at least one of a PUCSH configuration, a PUCCH configuration, an SRS configuration, an uplink power control configuration, and the like.
  • the handover message may include uplink UL configuration information, where the UL configuration information includes common configuration information of the common UL carrier and common configuration information of the SUL carrier, and dedicated configuration information of the common UL carrier. Dedicated configuration information for the SUL carrier.
  • the SUL carrier and the common UL carrier can support one or more BWPs, and the BWP configuration can also be included in the dedicated configuration information.
  • the index value of the BWP may be configured by using a dedicated RRC message or a system message.
  • the uplink BWP configuration may include at least one of the following: a frequency point, a bandwidth, a frequency offset, a PUCSH configuration, a PUCCH configuration, an SRS configuration, and an uplink power control configuration.
  • the common UL carrier supports BWP1 and BWP2, and the SUL carrier supports BWP1' and BWP2'.
  • the dedicated RACH configuration may be included in the configuration of the BWP.
  • the dedicated RACH configuration may be included in the BWP1 configuration of the NR UL carrier, and the terminal device performs random access by using a dedicated random access resource corresponding to the BWP1 frequency band of the common UL carrier.
  • the dedicated RACH configuration may be included in the common configuration information of the common UL.
  • the dedicated RACH configuration may be included in the dedicated configuration of the common UL carrier, and the terminal device adopts the corresponding common UL carrier. Dedicated random access resources for random access.
  • the uplink configuration may further include a Semi-Persistent Scheduling (SPS) configuration and/or a Grant Free (GF) configuration.
  • SPS Semi-Persistent Scheduling
  • GF Grant Free
  • the GF/SPS resource is configured on the common UL carrier and the SUL carrier for the same terminal device, the GF/SPS resources configured on the common UL carrier and the SUL carrier are required to be staggered in the time domain.
  • the GF/SPS resource is configured on only one UL carrier and the other UL carrier is not configured, for example, the GF/SPS resource is configured on the SUL, and the common UL is not configured, the common UL is configured.
  • the terminal device performs scheduling, it is necessary to avoid the time slot corresponding to the GF/SPS resource configured on the SUL.
  • the secondary station when the secondary station is added in a dual connectivity (DC) scenario, the secondary station here supports the SUL carrier.
  • the primary and secondary cells of the secondary station, the PSCell (or the secondary cell SCell), are equipped with the SUL carrier,
  • the terminal device is configured by using an RRC reconfiguration message.
  • the specific configuration manner of the RRC reconfiguration message is the same as the configuration manner of the foregoing handover message.
  • the method of the embodiment of the present application is also applicable to a scenario of dual connectivity.
  • the source network device in the handover scenario may correspond to the primary base station in the dual connectivity scenario
  • the target network device in the handover scenario may correspond to the secondary base station in the dual connectivity scenario.
  • the corresponding two devices can perform the same or similar operations.
  • the handover message in the handover scenario and the RRC connection reconfiguration message in the dual connectivity scenario may each include the indication information described above.
  • FIG. 5 is a schematic flowchart of a method for secondary station addition provided by an embodiment of the present application. It should be understood that FIG. 5 illustrates steps or operations of a method of adding a secondary station, but these steps or operations are merely examples, and other embodiments of the present application may also perform other operations or variations of the various operations in FIG. 5. Moreover, the various steps in FIG. 5 may be performed in a different order than that presented in FIG. 5, and it is possible that not all operations in FIG. 5 are to be performed.
  • the terminal device sends a measurement report to a master node (MN).
  • MN master node
  • the MN may be a primary base station MgNB of the NR system or a primary base station MeNB of the LTE system.
  • the measurement report includes measurement results of the terminal device to the serving cell and/or the neighboring cell.
  • the measurement result can be referred to the description of the measurement result in the above, and to avoid repetition, details are not described herein again.
  • the MN sends a secondary station addition request message to the secondary node (SN).
  • the SN may be a secondary base station SgNB of the NR system.
  • the MN after receiving the measurement report sent by the terminal device, the MN sends a secondary station addition request to the SN, where the secondary station addition request message includes the measurement result reported by the terminal device in the foregoing step 510, and the measurement result includes the cell belonging to the SN.
  • the secondary station addition request message includes the measurement result reported by the terminal device in the foregoing step 510, and the measurement result includes the cell belonging to the SN.
  • the SN determines a configuration of a secondary cell group (SCG) according to a threshold used for selecting an uplink carrier and a measurement result.
  • SCG secondary cell group
  • the SCG may be configured according to the following two modes.
  • the SN only configures the radio resource configuration for the SUL carrier.
  • the SN only configures a dedicated RACH configuration for the SUL carrier, the dedicated RACH configuration includes a preamble index and a time-frequency resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.
  • SN performs radio resource configuration for both SUL carrier and common UL carrier.
  • the SCG can be configured in the following two ways.
  • the SN only configures the radio resource configuration for the common UL carrier.
  • the dedicated RACH configuration includes a preamble index and a time-frequency resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.
  • the SN sends a secondary station add request response to the MN, where the request response includes a related configuration of the corresponding uplink carrier.
  • the MN sends an RRC connection reconfiguration message to the terminal device, where the request response includes a related configuration of the corresponding uplink carrier.
  • the secondary station addition request confirmation message includes the radio resource configuration corresponding to the SUL carrier.
  • the MN includes the radio resource configuration of the corresponding SUL carrier in the first RRC connection reconfiguration message.
  • the terminal device After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN by using the radio resource configuration of the corresponding SUL carrier (for example, using the dedicated RACH configuration corresponding to the SUL carrier and the PSCell of the primary and secondary cells under the secondary station for random access, using SUL
  • the carrier's PUCCH/PUSCH configuration and the secondary station perform data transmission, and establish a DC mode with the MN and the SN.
  • the MN/SN sends a second reconfiguration message to the terminal device (for example, the second reconfiguration message includes the updated radio resource configuration of the corresponding SUL carrier (if more than one SUL, the SUL is changed) Only one SUL configures the SUL with a new radio resource configuration) or contains the radio resource configuration corresponding to the common UL carrier (the following measurement results become better (above the threshold).
  • the network side decides to let the terminal device use the corresponding UL carrier.
  • the radio resource configuration communicates with the SN)), the terminal device communicates with the SN using the new configuration after receiving the second reconfiguration message.
  • the SN For the second configuration mode when the measurement result is lower than the threshold, the SN carries the radio resource configuration corresponding to the common UL carrier and the SUL carrier in the secondary station addition request acknowledgement message, and the SN instructs the terminal device to use the radio resource configuration of the corresponding SUL carrier.
  • the SN establishes an RRC connection, and after receiving the secondary station addition request acknowledgement message, the MN carries the radio resource configuration corresponding to the common UL carrier and the SUL carrier in the first RRC connection reconfiguration message, and optionally, may be used to indicate the use of the terminal device.
  • Corresponding information for establishing a connection between the radio resource configuration of the SUL carrier and the SN Corresponding information for establishing a connection between the radio resource configuration of the SUL carrier and the SN.
  • the secondary station addition request acknowledgement message/RRC connection reconfiguration message includes a threshold for selecting an uplink carrier, and after receiving the RRC connection reconfiguration message, the terminal device detects a cell belonging to the secondary station (PSCell and / Or the downlink measurement result RSRP of the Scell is higher than the threshold, and the terminal device can change, and communicate with the SN by using the radio resource configuration corresponding to the common UL carrier.
  • the MN/SN sends a second reconfiguration message to the terminal device (eg, the reconfiguration message carries the updated corresponding SUL (if there is more than one SUL, the SUL is changed, or only one SUL is configured to configure the SUL with a new wireless).
  • the terminal device receives the reconfiguration After the message, the new configuration is used to communicate with the SN.
  • the terminal device adopts the first The radio resource configuration of the corresponding SUL carrier included in the RRC Connection Reconfiguration message communicates with the SN.
  • the secondary station addition request acknowledgement message includes the radio resource configuration corresponding to the common UL carrier, and after receiving the secondary station addition request acknowledgement message, the MN connects to the first RRC connection.
  • the configuration message includes a radio resource configuration corresponding to the common UL carrier.
  • the terminal device After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN by using the radio resource configuration of the corresponding common UL carrier (for example, a dedicated RACH configuration and a secondary station using the common UL carrier)
  • the PSCell of the primary and secondary cells performs random access, uses the PUCCH/PUSCH configuration of the common UL carrier to perform data transmission with the secondary station, and establishes a DC mode with the MN and the SN.
  • the MN/SN sends a second reconfiguration message to the terminal device (for example, the second reconfiguration message includes the updated radio resource configuration of the corresponding common UL carrier (for example, configuring a new set for the common UL carrier) Radio resource configuration) or radio resource configuration including the corresponding SUL carrier (when the common UL carrier overload or downlink measurement result is worse (below the threshold), the network side decides to let the terminal device communicate with the SN using the radio resource configuration of the corresponding SUL carrier.
  • the second reconfiguration message includes the updated radio resource configuration of the corresponding common UL carrier (for example, configuring a new set for the common UL carrier) Radio resource configuration) or radio resource configuration including the corresponding SUL carrier (when the common UL carrier overload or downlink measurement result is worse (below the threshold)
  • each SUL carrier is equipped with its own radio resource configuration, and the network device (MN/SN) specifies which SUL carrier radio resource configuration the terminal device uses or the terminal device selects itself)
  • the terminal device After receiving the second reconfiguration message, the terminal device communicates with the SN by using the corresponding configuration.
  • the SN For the second configuration mode when the measurement result is higher than the threshold, the SN carries the radio resource configuration corresponding to the common UL carrier and the SUL carrier in the secondary station addition request acknowledgement message, and the SN indicates which carrier is used by the terminal device (is the SUL carrier still The radio resource configuration of the common UL carrier establishes an RRC connection with the SN.
  • the MN After receiving the secondary station addition request acknowledgement message, the MN carries the dedicated radio resource configuration corresponding to the common UL carrier and the SUL carrier in the first RRC connection reconfiguration message, and optionally, the MN may be configured to indicate which carrier is used by the terminal device.
  • the radio resource configuration indicates the connection information with the SN.
  • the secondary station addition request acknowledgement message/the first RRC connection reconfiguration message includes a threshold for selecting an uplink carrier, and after receiving the first RRC connection reconfiguration message, the terminal device obtains the threshold based on the threshold and the measurement The downlink measurement results of the station's cell (PSCell and/or Scell) are further determined. If it is lower than the threshold, the terminal device communicates with the SN using the radio resource configuration corresponding to the SUL carrier. Alternatively, the MN/SN sends a second reconfiguration message to the terminal device (eg, the reconfiguration message includes the updated corresponding SUL (if there is more than one SUL, the SUL is changed, or only one SUL is configured to configure the SUL with a new set of wireless).
  • the reconfiguration message includes the updated corresponding SUL (if there is more than one SUL, the SUL is changed, or only one SUL is configured to configure the SUL with a new set of wireless).
  • the case of the resource configuration) and/or the updated radio resource configuration of the common UL carrier, and the radio resource configuration including the indication information for indicating which carrier is used by the terminal device to establish a connection with the SN, after the terminal device receives the reconfiguration message Use the new configuration to communicate with the SN as directed.
  • the secondary base station when the secondary station supports the SUL carrier (for example, when the primary and secondary cells of the secondary station, the PSCell or the Scell, are configured with the SUL carrier), the secondary base station may measure the cell of the secondary base station according to the terminal device. And a threshold for resource configuration, the resource configuration including resource configuration information of at least one uplink carrier, where the at least one uplink carrier includes a common UL carrier or a SUL carrier. After receiving the resource configuration information of the at least one uplink carrier, the terminal device may determine that one target carrier is accessed in the at least one uplink carrier, and implement dual connectivity with the MN and the SN.
  • the SUL carrier for example, when the primary and secondary cells of the secondary station, the PSCell or the Scell, are configured with the SUL carrier
  • the secondary base station may measure the cell of the secondary base station according to the terminal device. And a threshold for resource configuration, the resource configuration including resource configuration information of at least one uplink carrier, where the at least one uplink carrier includes a common UL carrier or
  • FIG. 6 is a schematic flowchart of a method for secondary station addition provided by an embodiment of the present application. It should be understood that FIG. 6 illustrates steps or operations of the method of adding a secondary station, but these steps or operations are merely examples, and other embodiments of the present application may also perform other operations or variations of the various operations in FIG. 6. Moreover, the various steps in FIG. 6 may be performed in a different order than that presented in FIG. 6, and it is possible that not all operations in FIG. 6 are to be performed. In the embodiment of the present application, the MN and the SN may be the same or similar functions as those in FIG. 5.
  • the SN sends a threshold to the MN.
  • the SN may send a threshold for selecting the uplink carrier to the MN in advance through the X2/Xn interface.
  • the threshold here can be referred to the description of the threshold in the above, and to avoid repetition, details are not described herein again.
  • the terminal device sends a measurement report to the MN.
  • the measurement report can be referred to the description above, and to avoid repetition, details are not described herein again.
  • step 610 and step 620 may be interchanged, that is, the SN sending the threshold to the MN may occur before the terminal device sends the measurement report to the MN, or after the terminal device sends the measurement report to the MN.
  • the MN determines the SN configuration according to the threshold and the measurement result.
  • the MN After receiving the measurement report sent by the terminal device and the threshold sent by the SN, the MN determines the configuration of the SN according to the threshold and the measurement result.
  • the measurement result includes RSRP and/or RSRQ at the cell level, or a measurement result RSRP and/or RSRQ including a beam level of the cell.
  • the MN may instruct the SN to configure the radio resource configuration only for the SUL carrier.
  • the MN may instruct the SN to configure the radio resource configuration only for the common UL carrier.
  • the MN may instruct the SN to perform radio resource configuration for both the SUL carrier and the common UL carrier.
  • the MN sends a secondary station addition request to the SN.
  • the MN When the MN indicates that the SN only configures the radio resource configuration for the SUL carrier, the MN carries the indication information in the secondary station addition request message, where the indication information is used to indicate that the SN only configures the radio resource configuration for the SUL carrier.
  • the MN When the MN indicates that the SN only configures the radio resource configuration for the common UL carrier, the MN carries the indication information in the secondary station addition request, where the indication information is used to indicate that the SN only configures the radio resource configuration for the common UL carrier.
  • the MN When the MN indicates that the SN performs radio resource configuration for both the SUL carrier and the common UL carrier, the MN carries the indication information in the secondary station addition request, where the indication information is used to indicate that the SN performs radio resource configuration for both the SUL carrier and the common UL carrier.
  • the SN sends a secondary station add request response to the MN.
  • the secondary station addition request message includes the indication information for indicating that the SN only configures the radio resource configuration for the SUL carrier
  • the SN configures the radio resource configuration only for the SUL carrier
  • the radio resource configuration includes, for example, a dedicated RACH configuration
  • the dedicated RACH configuration includes the preamble
  • the index and the time-frequency resource may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.
  • the SN carries the radio resource configuration of the corresponding SUL carrier in the secondary station addition request acknowledgement message.
  • the secondary station addition request message includes the indication information for indicating that the SN only configures the radio resource configuration for the common UL carrier
  • the SN configures the radio resource configuration only for the common UL carrier
  • the radio resource configuration includes, for example, a dedicated RACH configuration, and a dedicated RACH configuration.
  • the preamble index and the time-frequency resource may also include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.
  • the SN carries the radio resource configuration of the common UL carrier in the secondary station addition request acknowledgement message.
  • the SN When the secondary station addition request message includes the indication information for instructing the SN to configure the radio resource configuration for the SUL carrier and the common UL carrier, the SN carries the radio resource configuration corresponding to the common UL carrier and the SUL carrier in the secondary station addition request acknowledgement message,
  • the radio resource configuration includes, for example, a dedicated RACH configuration including a preamble index and a time-frequency resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.
  • the SN instructs the terminal device to establish an RRC connection with the SN using a radio resource configuration corresponding to which carrier (SUL carrier or common UL carrier).
  • the MN sends an RRC connection reconfiguration message to the terminal device.
  • the MN carries the radio resource configuration of the corresponding SUL carrier in the first RRC connection reconfiguration message.
  • the terminal device After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN by using the radio resource configuration of the corresponding SUL carrier. If the dedicated RACH configuration of the SUL carrier is used for random access with the primary and secondary cells PSCell under the secondary station, the PUCCH/PUSCH configuration of the SUL carrier is used for data transmission with the secondary station, and the DC mode is established with the MN and the SN.
  • the MN or the SN sends a second reconfiguration message to the terminal device.
  • the second reconfiguration message includes the updated radio resource configuration of the corresponding SUL carrier, such as the case of changing the SUL carrier when there is more than one SUL carrier, or the case where only one SUL carrier is configured to configure a new radio resource configuration for the SUL carrier.
  • the network side decides to let the terminal device communicate with the SN using the radio resource configuration corresponding to the common UL carrier), and the terminal device receives After the second reconfiguration message, the new configuration is used to communicate with the SN.
  • the radio resource configuration of the common UL carrier is included in the first RRC connection reconfiguration message.
  • the terminal device After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN by using the radio resource configuration of the corresponding common UL carrier. For example, the dedicated RACH configuration of the common UL carrier and the PSCell of the primary and secondary cells under the secondary station are used for random access, and the PUCCH/PUSCH configuration of the common UL carrier is used for data transmission with the secondary station, and the DC mode is established with the MN and the SN.
  • the MN/SN sends a second reconfiguration message to the terminal device.
  • the second reconfiguration message includes the updated radio resource configuration of the corresponding common UL carrier, such as configuring a new radio resource configuration for the common UL carrier, or including a radio resource configuration corresponding to the SUL carrier.
  • the network side decides to let the terminal device communicate with the SN using the radio resource configuration of the corresponding SUL carrier. If there is more than one SUL carrier, multiple SUL carriers are configured, and each SUL carrier is configured with its own radio resource configuration, and the network specifies which SUL carrier radio resource configuration or the terminal device selects itself. After receiving the second reconfiguration message, the terminal device communicates with the SN by using the corresponding configuration.
  • the dedicated radio resource configuration corresponding to the common UL carrier and the SUL carrier is included in the first RRC connection reconfiguration message, and optionally, It may also include indication information for instructing the terminal device to establish a connection with the SN using a radio resource configuration corresponding to which carrier.
  • the secondary station addition request acknowledgement message or the first RRC connection reconfiguration message includes a threshold for selecting the UL carrier.
  • the terminal device After receiving the first RRC connection reconfiguration message, the terminal device performs further determination based on the threshold and the measured downlink measurement result of the cell (PSCell and/or Scell) belonging to the secondary station. If it is lower than the threshold, the terminal device communicates with the SN using the radio resource configuration corresponding to the SUL carrier. Alternatively, the MN/SN sends a second reconfiguration message to the terminal device.
  • the reconfiguration message includes an updated corresponding SUL carrier (eg, when more than one SUL carrier is changed, a SUL carrier is changed, or only one SUL carrier is configured to configure a new radio resource configuration for the SUL carrier) and/or updated The radio resource configuration of the common UL carrier, and the radio resource configuration for indicating which carrier is used by the terminal device to establish connection indication information with the SN.
  • the terminal device After receiving the reconfiguration message, the terminal device communicates with the SN according to the indication according to the new configuration.
  • the MN may use the measurement result of the terminal device to the SN cell.
  • the threshold sent by the SN selects at least one carrier, and indicates that the SN configures the at least one carrier.
  • the SN determines resource configuration information for the at least one uplink carrier, where the at least one uplink carrier determined by the SN includes a common UL carrier and/or a SUL carrier.
  • the terminal device may determine that one target carrier is accessed in the at least one uplink carrier, and implement dual connectivity with the MN and the SN.
  • FIG. 7 is a schematic block diagram of a terminal device 700 provided by an embodiment of the present application.
  • the terminal device 700 includes a receiving unit 710 and a processing unit 720.
  • the receiving unit 710 is configured to receive indication information that is sent by the network device, where the indication information is used to indicate resource configuration information of the at least one uplink carrier, where the at least one uplink carrier includes the first uplink carrier and/or the at least one second uplink carrier.
  • the first uplink carrier and the at least one second uplink carrier are different uplink carriers in one cell of the network device, and the first uplink carrier and the at least one second uplink carrier correspond to One downlink carrier in the cell.
  • the indication information is used to indicate resource configuration information of the first uplink carrier or the second uplink carrier, where the first uplink carrier and the second uplink carrier are different uplinks in a cell of the network device.
  • a carrier, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in the cell.
  • the processing unit 720 is configured to determine, according to the resource configuration information of the at least one uplink carrier, one uplink carrier as the target carrier in the at least one uplink carrier for random access.
  • the processing unit 720 is configured to determine a target carrier according to the indication information, and the processing unit 720 is further configured to initiate random access by using the target carrier.
  • the indication information is carried by a reconfiguration message for performing synchronization, where the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier and configuration information of the second uplink carrier,
  • the processing unit is specifically configured to:
  • the first uplink carrier is the target carrier if it is determined that the measurement result of the downlink reference signal is greater than or equal to the threshold;
  • the configuration information of the first uplink carrier and the configuration information of the second uplink carrier include respective physical uplink shared channel PUSCH configuration, physical uplink control channel PUCCH configuration, sounding reference signal SRS configuration, and uplink power. Control at least one of the configurations.
  • the reconfiguration message for performing synchronization further includes the threshold.
  • the resource configuration information includes a dedicated random access resource
  • the processing unit 720 is specifically configured to:
  • the number of the at least one uplink carrier is at least two, one of the at least two uplink carriers is determined as the target carrier.
  • the indication information includes a carrier index corresponding to the dedicated random access resource
  • the processing unit 720 is specifically configured to: determine, as the carrier indicated by the carrier index corresponding to the dedicated random access resource, as a carrier At least one uplink carrier corresponding to the dedicated random access resource.
  • the dedicated random access resource has a corresponding relationship with an uplink carrier configured with a physical uplink control channel PUCCH resource
  • the processing unit 720 is specifically configured to: according to the dedicated random access resource and configuration Determining a correspondence between uplink carriers of the PUCCH resource, and determining at least one uplink carrier corresponding to the dedicated random access resource.
  • the resource configuration information further includes a PUCCH resource, where the processing unit 720 is specifically configured to:
  • One of the uplink carriers in which the PUCCH resources are configured in the at least two uplink carriers is determined as the target carrier.
  • the resource configuration information further includes a universal random access resource, where the terminal device performs non-contention based random access failure on the target carrier by using the dedicated random access resource, where the terminal device Contention based random access is performed on the target carrier or another uplink carrier different from the target carrier using the universal random access resource.
  • the resource configuration information includes a PUCCH resource
  • the processing unit 720 is specifically configured to:
  • One of the uplink carriers in which the PUCCH resources are configured in the at least one uplink carrier is determined as the target carrier.
  • the processing unit 720 is specifically configured to: when the number of uplink carriers configured with the PUCCH resource is one, the terminal device determines the uplink carrier configured with the PUCCH resource as the target carrier;
  • the terminal device determines the target carrier according to the measurement result of the cell.
  • the resource configuration information includes a universal random access resource
  • the processing unit 720 is specifically configured to:
  • the terminal device determines the target carrier in the at least one uplink carrier according to a measurement result of the cell.
  • the measurement result includes a measurement result of the downlink reference signal, where the processing unit 720 is specifically configured to:
  • the terminal device determines the first uplink carrier as the target carrier
  • the terminal device determines the second uplink carrier as the target carrier.
  • the terminal device performs random access on another uplink carrier different from the target carrier, where X, Y, and Z are respectively greater than A positive integer of 1.
  • the receiving unit 710 may be implemented by a transceiver
  • the processing unit 720 may be implemented by a processor.
  • the terminal device 800 can include a processor 810, a memory 820, and a transceiver 830.
  • the memory 820 can be used to store code and the like executed by the processor 810, and the processor 810 can be used to process data or programs.
  • each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 810 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 820, and the processor 810 reads the information in the memory 820 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the terminal device 700 shown in FIG. 7 or the terminal device 800 shown in FIG. 8 can implement various processes corresponding to the foregoing method embodiments. Specifically, the terminal device 700 or the terminal device 800 can refer to the description above, in order to avoid duplication. I won't go into details here.
  • FIG. 9 is a schematic block diagram of a network device 900 provided by an embodiment of the present application.
  • Network device 900 can include processing unit 910 and transmitting unit 920.
  • the processing unit 910 is configured to determine first indication information, where the first indication information is used to indicate resource configuration information of the at least one uplink carrier, where the at least one uplink carrier includes the first uplink carrier and/or the at least one second uplink carrier
  • the first uplink carrier and the at least one second uplink carrier are different uplink carriers in one cell of the network device 900, and the first uplink carrier and the at least one second uplink carrier Corresponding to one downlink carrier in the cell.
  • the first indication information is used to indicate resource configuration information of the first uplink carrier or the second uplink carrier, where the first uplink carrier and the second uplink carrier are different in a cell of the device.
  • An uplink carrier, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in the cell.
  • the sending unit 920 is configured to send the first indication information, so that the terminal device determines, in the at least one uplink carrier, an uplink carrier as a target carrier for random access.
  • the first indication information is carried by a reconfiguration message for performing synchronization, where the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier and configuration of the second uplink carrier.
  • the information, or the reconfiguration message for performing synchronization includes configuration information of the first uplink carrier or configuration information of the second uplink carrier.
  • the configuration information of the first uplink carrier includes a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal (SRS) configuration, and an uplink of the first uplink carrier.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • the configuration information of the second uplink carrier includes a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, and a sounding reference signal (SRS) of the second uplink carrier At least one of configuration and uplink power control configuration.
  • the reconfiguration message for performing synchronization further includes a threshold, where the threshold is used by the terminal device to determine the target carrier according to a measurement result of a downlink reference signal.
  • the first indication information is used to indicate resource configuration information of the target carrier.
  • the network device 900 further includes a receiving unit, configured to receive a measurement result of the terminal device to the cell;
  • the processing unit 910 is specifically configured to determine the target carrier in the at least one uplink carrier according to the measurement result received by the receiving unit.
  • the measurement result includes a measurement result of the downlink reference signal, where the processing unit 910 is specifically configured to:
  • the measurement result of the downlink reference signal is greater than or equal to a threshold, determining the first uplink carrier in the at least one uplink carrier as the target carrier;
  • the resource configuration information includes a dedicated random access resource and/or a PUCCH resource
  • the first indication information includes a carrier index corresponding to the dedicated random access resource, and a carrier index corresponding to the dedicated random access resource is used to indicate at least one uplink carrier corresponding to the dedicated random access resource;
  • the dedicated random access resource has a corresponding relationship with an uplink carrier configured with a physical uplink control channel PUCCH resource, and the corresponding relationship is used to indicate at least one uplink carrier corresponding to the dedicated random access resource.
  • the first indication information further includes a universal random access resource.
  • the sending unit 920 is further configured to send the second indication information to the terminal device, where the second indication information is used to indicate that when the terminal device adopts power ascending order on the target carrier, After X times of random access, or after the terminal device initiates a random access failure Y times on the target carrier, or after the terminal device transmits a random access preamble sequence Z times on the target carrier The terminal device performs random access on another uplink carrier different from the target carrier, where X, Y, and Z are positive integers greater than 1, respectively.
  • the processing unit 910 may be implemented by a processor, and the sending unit 920 may be implemented by a transceiver.
  • network device 1000 can include a processor 1010, a memory 1020, and a transceiver 1030.
  • the memory 1020 can be used to store code and the like executed by the processor 1010, and the processor 1010 can be used to process data or programs.
  • each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 1010 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1020, and the processor 1010 reads the information in the memory 1020 and performs the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the network device 900 shown in FIG. 9 or the network device 1000 shown in FIG. 10 can implement various processes corresponding to the foregoing method embodiments. Specifically, the network device 900 or the network device 1000 can refer to the description above, in order to avoid duplication. I won't go into details here.
  • the embodiment of the present application further provides a computer readable medium for storing a computer program, where the computer program includes instructions for executing a method corresponding to a terminal device or a network device in the foregoing method embodiment.
  • the embodiment of the present application further provides a computer program product, comprising: computer program code, when the computer program code is communicated by a communication unit (for example, a terminal device or a network device), a processing unit, or a transceiver When the processor is running, the communication device is caused to perform the method corresponding to the terminal device or the network device in the foregoing method embodiment.
  • a communication unit for example, a terminal device or a network device
  • a processing unit for example, a terminal device or a network device
  • transceiver When the processor is running, the communication device is caused to perform the method corresponding to the terminal device or the network device in the foregoing method embodiment.
  • the embodiment of the present application further provides a communication chip in which an instruction is stored, and when it is run on a communication device, the communication chip is caused to execute a method corresponding to the terminal device or the network device in the foregoing method embodiment.
  • the embodiment of the present application further provides a communication system, where the communication system includes the foregoing terminal device and a network device.
  • the communication system in the embodiment of the present application may be in a handover scenario or a dual connectivity scenario, where the communication system includes the terminal device, the source network device, and the target network device described above when in the handover scenario.
  • the communication system includes the terminal device, the primary base station, and the secondary base station described above.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请提供了一种通信方法以及终端设备、网络设备，能够在支持多个上行频段的小区中选择上行载波进行随机接入。该通信方法包括：终端设备接收网络设备发送的指示信息，所述指示信息用于指示至少一个上行载波的资源配置信息，所述至少一个上行载波包括第一上行载波和/或至少一个第二上行载波，其中，所述第一上行载波和所述至少一个第二上行载波为所述网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述至少一个第二上行载波对应于所述小区中的一个下行载波。所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。

Description

通信方法及其终端设备、网络设备
本申请要求于2017年11月17日提交中国专利局、申请号为201711147611.9、申请名称为“通信方法及其终端设备、网络设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体的，涉及通信领域中的一种通信方法以及终端设备、网络设备。
背景技术
传统的小区由一个下行载波和一个上行载波组成，并且，在传统小区中上行载波与下行载波的频率是相同的或相近的。但是，由于在新无线(New Radio，NR)系统中，部署高频小区时，高频小区中运行频段较高且终端设备的发射功率较低，使得处于小区边缘区域的终端设备可以接收到小区中基站的信号，但是基站无法接收到边缘区域中的终端设备的信号，即存在上下行覆盖不对称的问题。为了解决这个问题，可以在小区原有的高频上行频段之外，引入一个或多个额外的更低频率的上行频段来发送上行信号，我们可以称该更低频率的上行频段为补充上行(Supplemental Uplink，SUL)载波，由于该额外的上行频段具有更小的信号衰减，从而能够提高上行覆盖，使得上下行覆盖达到一致。例如，在实际部署时，可以采用1.8G和3.5G的上行频段，下行采用3.5G频段，但不局限于此，也可以采用其他频段的部署方案。因此，当小区存在多个上行频段，终端设备在接入该小区时如何选择载波(即选择资源)，以及网络设备如何进行资源配置是一个亟待解决的问题。
发明内容
本申请提供一种通信方法以及终端设备、网络设备，能够在支持多个上行频段的小区中选择上行载波进行随机接入。
第一方面，提供了一种通信方法，包括：
终端设备接收网络设备发送的指示信息，所述指示信息用于指示至少一个上行载波的资源配置信息，所述至少一个上行载波包括第一上行载波和/或至少一个第二上行载波，其中，所述第一上行载波和所述至少一个第二上行载波为所述网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述至少一个第二上行载波对应于所述小区中的一个下行载波。
所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
因此，本发明实施例中，当终端设备要切换到的所述网络设备的该小区(即目标小区) 中包括第一上行载波和至少一个第二上行载波，且该第一上行载波和至少一个第二上行载波对应于该目标小区中的一个下行载波时，网络设备可以向终端设备发送包括第一上行载波和/或至少一个第二上行载波中的至少一个上行载波的资源配置信息，使得终端设备可以根据该至少一个上行载波的资源配置信息，在至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
本申请实施例的通信方法可以应用于切换场景和双连接的场景中。具体的，在切换场景中，该网络设备为目标网络设备，并且该指示信息可以包含在切换请求响应消息和切换消息中。在双连接场景中，该网络设备为辅基站，并且该指示信息可以包含在辅站添加请求确认消息和RRC连接重配置消息中。
应理解，第一上行载波和第二上行载波分别为不同频段的上行载波。例如第一上行载波可以为5G NR系统中部署的高频频段的上行载波，该上行载波可以称为NR UL载波、PUL载波、Normal UL载波或common UL载波。第二上行载波为另一段低频频段(如LTE系统或其他通信系统)的上行载波，可以用于辅助终端设备进行上行传输，该上行载波可以称为SUL载波。
可选的，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息，或者，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息或所述第二上行载波的配置信息。
可选的，所述第一上行载波的配置信息包括所述第一上行载波的物理上行共享信道(PUSCH)配置、物理上行链路控制信道(PUCCH)配置、探测参考信号(SRS)配置、上行功率控制配置的至少一种；所述第二上行载波的配置信息包括所述第二上行载波的物理上行共享信道(PUSCH)配置、物理上行链路控制信道(PUCCH)配置、探测参考信号(SRS)配置、上行功率控制配置的至少一种。
可选的，所述资源配置信息包括专用随机接入资源，所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入，包括：
所述终端设备根据所述指示信息，确定所述专用随机接入资源对应的所述至少一个上行载波。
如果所述至少一个上行载波的数量为一个，所述终端设备将所述上行载波确定为所述目标载波。
如果所述至少一个上行载波的数量为至少两个，所述终端设备将所述至少两个上行载波中的一个确定为所述目标载波。
这样，当指示信息中的资源配置信息包含专用随机接入资源，且专用随机接入资源对应有上行载波时，终端设备使用该专用随机接入资源进行基于非竞争的随机接入。并且具体的，当专用随机接入资源对应的上行载波的数量为一个时，终端设备在使用该专用随机接入资源在该上行载波上进行随机接入。当专用随机接入资源对应的上行载波的大于一个时，终端设备在使用该专用随机接入资源在该至少两个上行载波中的一个上进行随机接入。
可选的，所述指示信息中包括所述专用随机接入资源对应的载波索引。
其中，所述终端设备根据所述指示信息，确定所述专用随机接入资源对应的所述至少一个上行载波，包括：
所述终端设备将所述专用随机接入资源对应的载波索引指示的载波确定为所述专用随机接入资源对应的至少一个上行载波。
这样，通过载波索引可以显式地指示该专用随机接入资源对应哪些或哪个上行载波。
可选的，所述专用随机接入资源与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系。
其中，所述终端设备根据所述指示信息，确定所述专用随机接入资源对应的所述至少一个上行载波，包括：
所述终端设备根据所述专用随机接入资源与配置有所述PUCCH资源的上行载波的对应关系，确定所述专用随机接入资源对应的至少一个上行载波。
这样，该指示信息通过指示专用随机接入资源与配置有PUCCH资源的上行载波的对应关系，可以隐式指示该专用随机接入资源对应哪些或哪个上行载波。
可选的，所述资源配置信息还包括PUCCH资源，所述终端设备将所述至少两个上行载波中的一个确定为所述目标载波，包括：
所述终端设备将所述至少两个上行载波中配置有PUCCH资源的上行载波中的一个确定为所述目标载波。
也就是说，当资源配置信息包括专用随机接入资源和PUCCH资源时，终端设备可以根据上述方式确定该专用随机接入资源对应的至少两个上行载波，然后将该至少两个上行载波中配置有PUCCH资源的上行载波确定为目标载波。
可选的，所述资源配置信息还包括通用随机接入资源，所述方法还包括：
如果所述终端设备使用所述专用随机接入资源在所述目标载波上进行基于非竞争的随机接入失败，所述终端设备使用所述通用随机接入资源在所述目标载波或不同于所述目标载波的另一个上行载波上进行基于竞争的随机接入。
可选的，所述资源配置信息包括PUCCH资源，所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入，包括：
所述终端设备将所述至少一个上行载波中配置有PUCCH资源的上行载波中的一个确定为所述目标载波。
也就是说，本申请实施例中，当资源配置信息不包括专用随机接入资源，包括PUCCH资源的情况下，终端设备可以将配置有PUCCH资源的至少一个载波中的一个确定为目标载波，并使用通用随机接入资源在该上行载波上进行基于竞争的随机接入。
可选的，当配置有PUCCH资源的上行载波的数量为一个时，所述终端设备将所述配置有PUCCH资源的上行载波确定为所述目标载波。
当配置有PUCCH资源的上行载波数量为至少两个，所述终端设备根据对所述小区的测量结果，确定所述目标载波。
可选的，所述资源配置信息包括通用随机接入资源，所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入，包括：
所述终端设备根据对所述小区的测量结果，在所述至少一个上行载波中确定所述目标载波。
也就是说，当资源配置信息没有包含专用随机接入资源或PUCCH资源，即资源配置信息仅包含通用随机接入资源，或者资源配置信息包含专用随机接入资源，但是网络设备没有采用上文所述的显式或隐式的方法指示该专用随机接入资源对应哪些或哪个上行载波。这时，网络设备发送的指示信息可以指示至少一个上行载波的通用随机接入资源。终端设备可以根据对所述小区的测量结果，在至少一个上行载波中确定所述目标载波。
这里，小区的测量结果包括下行参考信号的测量结果，下行参考信号可以包括同步信号(synchronization signal，SS)(其中SS包括主同步信号PSS/辅同步信号SSS)和/或信道状态信息参考信号(Channel State Information Reference signal，CSI-RS)参考信号和/或物理广播信道-解调参考信号(Physical Broadcast Channel-Demodulation reference signal,PBCH-DMRS)信号。
可选的，所述终端设备根据对所述小区的测量结果，确定所述目标载波，包括：
如果所述下行参考信号的测量结果大于或等于阈值，所述终端设备将所述第一上行载波确定为所述目标载波。
如果所述下行参考信号的测量结果小于所述阈值，所述终端设备将所述第二上行载波确定为所述目标载波。
可选的，所述用于进行同步的重配置消息还包括所述阈值，该阈值用于所述终端设备根据下行参考信号的测量结果确定所述目标载波。
本申请实施例中，可以采用下面3种方式进行阈值的配置：
1)、目标网络设备的系统消息中可以包含该阈值。该系统消息例如为RMSI。本申请中的该阈值可以与初始接入时使用的阈值为同一阈值，即系统消息中包含的该阈值是唯一的，既可以适用于初始接入时的上行载波选择，也可以适用于切换时的上行载波选择。或者该阈值可以与初始接入时使用的阈值为不同的阈值，即系统消息中包含两个阈值，一个用于初始接入时的上行载波选择，另一个用于切换时的上行载波选择。可理解，此时，本申请实施例中的切换消息中不包括该阈值。这时，终端设备可以根据目标网络设备广播的系统消息中所包含的该阈值进行上行载波的选择。
2)、源网络设备向终端设备发送的切换消息中可以包括该阈值。具体的，该阈值可以包含在RMSI中，RMSI可选包含在切换消息中。具体地，RMSI包含阈值的方式可以如上述方式1)所述。这时，终端设备可以根据切换消息中包括的该阈值进行上行载波的选择。
3)、协议中可以规定该阈值的大小。
可选的，如果所述终端设备在所述目标载波上采用功率升序的方式发起了X次随机接入之后，或，如果所述终端设备在所述目标载波上发起随机接入失败Y次之后，或在所述目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
第二方面，本申请实施例提供了一种通信方法，包括：
网络设备确定第一指示信息，所述第一指示信息用于指示至少一个上行载波的资源配置信息，所述至少一个上行载波包括第一上行载波和/或至少一个第二上行载波，其中， 所述第一上行载波和所述至少一个第二上行载波为所述网络设备的一个小区中的不同的上行载波，且所述第一上行载波和所述至少一个第二上行载波对应于所述小区中的一个下行载波。
所述网络设备发送所述第一指示信息，使得终端设备在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
因此，本发明实施例中，当终端设备要切换到的所述网络设备的小区(即目标小区)中包括第一上行载波和至少一个第二上行载波，且该第一上行载波和至少一个第二上行载波对应于该目标小区中的一个下行载波时，网络设备可以向终端设备发送包括第一上行载波和/或至少一个第二上行载波中的至少一个上行载波的资源配置信息，使得终端设备可以根据该至少一个上行载波的资源配置信息，在至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
本申请实施例的通信方法可以应用于切换场景和双连接的场景中。具体的，在切换场景中，该网络设备为目标网络设备，并且该指示信息可以包含在切换请求响应和切换消息中。在双连接场景中，该网络设备为辅基站，并且该指示信息可以包含在辅站添加请求确认消息和RRC连接重配置消息中。
应理解，第一上行载波和第二上行载波分别为不同频段的上行载波。例如第一上行载波可以为5G NR系统中部署的高频频段的上行载波，该上行载波可以称为NR UL载波、PUL载波、Normal UL载波或common UL载波。第二上行载波为另一段低频频段(如LTE系统或其他通信系统)的上行载波，可以用于辅助终端设备进行上行传输，该上行载波可以称为SUL载波。
可选的，所述第一指示信息用于指示所述目标载波的资源配置信息；
其中，所述网络设备确定第一指示信息，包括：所述网络设备接收所述终端设备对所述小区的测量结果。
所述网络设备根据所述测量结果，在所述至少一个上行载波中确定所述目标载波。
可选的，所述测量结果包括下行参考信号的测量结果，其中，所述网络设备根据所述测量结果，在所述至少一个上行载波中确定所述目标载波，包括：
如果所述下行参考信号的测量结果大于或等于阈值，所述网络设备将所述至少一个上行载波中的所述第一上行载波确定为所述目标载波。
如果所述下行参考信号的测量结果小于所述阈值，所述网络设备将所述至少一个上行载波中的所述第二上行载波确定为所述目标载波。
具体的，当目标网络设备支持至少两个上行载波时，目标网络设备可以为其中一个上行载波配置专用随机接入资源。或者，当目标网络设备支持至少两个上行载波时，目标网络设备可以没有配置任何专用随机接入资源，但为其中一个上行载波配置PUCCH资源。
可选的，所述资源配置信息包括专用随机接入资源和/或PUCCH资源。
其中，所述第一指示信息中包括所述专用随机接入资源对应的载波索引，所述专用随机接入资源对应的载波索引用于指示所述专用随机接入资源对应的至少一个上行载波；或
所述专用随机接入资源与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系，所述对应关系用于指示所述专用随机接入资源对应的至少一个上行载波。
可选的，所述第一指示信息中还包括通用随机接入资源。
可选的，目标网络设备为终端设备配置的随机接入资源还有以下6种可能的情况。
1)、目标网络设备支持两个上行载波(一个common UL carrier和一个SUL carrier)，且为这两个上行载波中的每个上行载波都配置了专用随机接入资源。
2)、目标网络设备支持两个上行载波(一个common UL carrier和一个SUL carrier)，目标网络设备没有为这两个上行载波配置任何专用随机接入资源，但分别为这两个上行载波配置PUCCH配置。
3)、目标网络设备支持大于两个上行载波(一个common UL carrier和至少一个SUL carrier)，目标网络设备为所有上行载波都配置了专用随机接入资源。
4)、目标网络设备支持大于两个上行载波(一个common UL carrier和至少一个SUL carrier)，第二网络设备为其中一个或一部分(即该至少两个上行载波中的部分)上行载波配置了专用随机接入资源。
5)、目标网络设备支持大于两个上行载波(一个common UL carrier和至少一个SUL carrier)，第二网络设备没有配置任何专用随机接入资源，但分别为每个上行载波配置PUCCH配置。
6)、目标网络设备支持大于两个上行载波，目标网络设备没有配置任何专用随机接入资源，但为其中一个或一部分上行载波的PUCCH配置。
可选的，所述网络设备向所述终端设备发送第二指示信息，所述第二指示信息用于指示当所述终端设备在所述目标载波上采用功率升序的方式发起了X次随机接入之后，或，当所述终端设备在所述目标载波上发起随机接入失败Y次之后，或当所述终端设备在所述目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
第三方面，提供了一种终端设备，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。具体地，该终端设备包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的单元。
第四方面，提供了一种网络设备，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。具体地，该装置包括用于执行上述第二方面或第二方面的任意可能的实现方式中的方法的单元。
第五方面，提供了一种终端设备，该终端设备包括：收发器、存储器、处理器和总线系统。其中，该收发器、该存储器和该处理器通过该总线系统相连，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制收发器接收和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第一方面或第一方面的任意可能的实现方式中的方法。
第六方面，提供了一种网络设备，该网络设备包括：收发器、存储器、处理器和总线系统。其中，该收发器、该存储器和该处理器通过该总线系统相连，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制收发器接收信号和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第二方面或第二方面的任意可能的实现方式中的方法。
第七方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行上述任一方面的任意可能的实现方式中的方法的指令。
第八方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被通信设备(例如，终端设备或网络设备)的通信单元、处理单元或收发器、处理器运行时，使得通信设备执行上述任一方面的任意可能的实现方式中的方法。
第九方面，提供了一种通信芯片，其中存储有指令，当其在通信装置上运行时，使得所述通信芯片执行上述任一方面的任意可能的实现方式中的方法。
第十方面，提供了一种通信系统，该通信系统包括上述终端设备和网络设备。
附图说明
图1是本申请实施例的NR系统中的小区部署的示意图。
图2是本申请实施例的一种通信方法的示意性流程图。
图3是本申请实施例的另一种通信方法的示意性流程图。
图4是本申请实施例的另一种通信方法的示意性流程图。
图5是本申请实施例的另一种通信方法的示意性流程图。
图6是本申请实施例的另一种通信方法的示意性流程图。
图7是本申请实施例的一种终端设备的示意性流程图。
图8是本申请实施例的另一种终端设备的示意性流程图。
图9是本申请实施例的一种网络设备的示意性流程图。
图10是本申请实施例的另一种网络设备的示意性流程图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、未来的第五代(5th Generation，5G)系统，例如新无线(New Radio，NR)系统等。
本申请实施例中的终端设备可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，PLMN)中的终端设备等，本申请实施例对此并不限定。
本申请实施例中的网络设备可以是用于与终端设备通信的设备，可以是LTE系统中的演进型基站(Evolutional NodeB，eNB或eNodeB)，还可以是云无线接入网络(Cloud Radio Access Network，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备，以及未来5G网络中的网络设备或者未来演进的PLMN网 络中的网络设备等，例如可以是NR系统中的基站设备gNB，本申请实施例并不限定。
本申请实施例中所述的源网络设备是指终端当前接入或驻留的接入网设备，且终端将从该接入网设备切换至其他接入网设备。对应地，本申请实施例中所述的目标网络设备是指终端将切换到的接入网设备。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/“，表示前后关联对象是一种“或”的关系。
本申请实施例中出现的“多个”是指两个或两个以上。
本申请实施例中出现的第一、第二等描述，仅作示意与区分描述对象之用，没有次序之分，也不表示本申请实施例中对设备个数的特别限定，不能构成对本申请实施例的任何限制。
本申请实施例中出现的“连接”是指直接连接或者间接连接等各种连接方式，以实现设备间的通信，本申请实施例对此不做任何限定。
图1是本申请实施例的NR系统中的一种小区部署的示意图。图1中区域1部分为高频小区的下行覆盖范围，区域2部分为高频小区的上行覆盖范围，且区域1部分和区域2部分的大小不对称，并且，区域2的覆盖范围小于区域1的覆盖范围。具体的，对于高频小区的下行传输而言，网络设备的发射功率基本不受限，因此，网络设备可以使用更大的发射功率发送来提高下行覆盖的范围。但是终端设备受限于最大发射功率等原因无法通过提高发射功率来提高上行覆盖范围，因此会造成高频小区的上行覆盖范围与下行覆盖范围不一致。本申请实施例中，可以称该区域1中的下行载波为NR下行(NR Downlink，NR DL)载波(carrier)，称区域2中的上行载波为NR上行(NR Uplink，NR UL)载波、PUL载波、Normal UL载波或common UL载波或Non SUL载波。为了描述方法，下文将统一以common UL载波进行描述。
图1中的区域3部分为SUL载波的覆盖范围，并且区域3的覆盖范围与区域1的覆盖范围相同或相近。SUL载波具有比common UL载波更低频率的上行频段，因此在该区域中信号衰减更小，终端设备可以采用较低的发射功率进行信号发送。这时，终端设备拥有两段频谱进行上行传输，即终端设备可以采用SUL载波和common UL载波进行上行传输，也就是说，支持SUL配置的小区有一个下行载波和两个上行载波。
可理解，本申请实施例仅以图1中的应用场景为例进行说明，但本申请实施例并不限于此，例如该小区还可以包括其他的SUL载波，即支持SUL配置的小区中的终端设备可以使用一个common UL载波和至少一个SUL载波进行上行传输。
图2示出了本申请实施例提供的一种通信方法的交互流程图，该通信方法可以用于终端设备从源基站(source gNB)切换到目标基站(target gNB)的过程中。应理解，本申请实施例以NR系统为例进行描述，但是本申请实施例的技术方案并不限于5G系统。并且，本申请实施例中，网络设备/终端设备可以执行上述实施例中的部分或全部步骤，这些步骤或操作仅是示例，本发明实施例还可以执行其它操作或者各种操作的变形。此外，各个步骤可以按照上述实施例呈现的不同的顺序来执行，并且有可能并非要执行上述实施例中的全部操作。
210，网络设备向终端设备发送指示信息，该指示信息用于指示至少一个上行载波的 资源配置信息。
这里，该网络设备为目标网络设备或源网络设备，其中，目标网络设备可以是目标基站，即上述target gNB，源网络设备可以是源基站，即上述source gNB。具体而言，该指示信息可以包含在目标网络设备向源网络设备发送的切换请求确认消息中，源网络设备再发给终端设备切换消息，该切换消息中包含该指示信息。换句话说，目标网络设备可以先将该指示信息发送给源网络设备，再由源网络设备将该指示信息透传至终端设备。
也就是说，本申请实施例中，该指示信息可以包含在切换响应确认消息以及切换消息中。具体的，该切换消息可以为包含移动控制信息(mobility control info)的无线资源控制(Radio Resource Control，RRC)连接重配置消息，或其他用于指示终端设备进行切换/改变服务小区/同步重配置的消息。
具体而言，终端设备向源网络设备上报测量报告，源网络设备根据终端设备上报的测量报告或根据其他信息，进行切换判决，并确定出切换到的目标小区。然后，向所述目标小区所属的网络设备(即目标网络设备)发送切换请求消息，目标网络设备根据收到的切换请求消息进行准入控制(例如，配置资源)后，给源网络设备回复切换请求确认消息，源网络设备收到该切换请求确认消息后给终端设备发送切换消息。
本申请实施例中，该至少一个上行载波为终端设备的要切换到的目标小区中的上行载波，即终端设备要切换到的目标网络设备的小区中的上行载波。并且更具体的，该至少一个上行载波包括第一上行载波和/或至少一个第二上行载波，该第一上行载波和至少一个第二上行载波为所述终端设备的要切换到的目标小区中的不同的上行载波，且所述第一上行载波和所述至少一个第二上行载波对应于所述目标小区中的一个下行载波。
应理解，第一上行载波和第二上行载波分别为不同频段的上行载波。例如第一上行载波可以为NR系统中部署的高频频段的上行载波，即上文中所述的NR UL载波、PUL载波、Normal UL载波或common UL载波。第二上行载波为另一段低频频段(如LTE系统或其他通信系统)的上行载波，可以用于辅助终端设备进行上行传输，即上文中所述的SUL载波。因此，本申请实施例中，终端设备可以拥有两段频谱进行上行传输，并且，第一上行载波的覆盖范围小于第二上行载波的覆盖范围。具体的，第一上行载波的覆盖范围和第二上行载波的覆盖范围的描述可以参见图1中的描述，为避免重复，这里不再赘述。
另外，本申请实施例中，该目标小区配置有一个下行载波、第一上行载波和至少一个第二上行载波，其中，所述第一上行载波和所述至少一个第二上行载波对应于所述目标小区中的一个下行载波，可以理解为该下行载波的覆盖范围与该下行载波对应的至少一个SUL载波中的一个SUL载波的覆盖范围相同或相近。例如，当只有一个SUL载波时，下行载波的覆盖范围与该SUL载波的覆盖范围相同或相近。并且，该下行载波与该第一上行载波的频段相同或相近，而该至少一个第二上行载波是用于辅助终端设备进行上行传输的载波，其频段可以低于该下行载波或该第一上行载波。
可选的，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息，或者，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息或所述第二上行载波的配置信息。
可选的，所述第一上行载波的配置信息包括所述第一上行载波的物理上行共享信道 (PUSCH)配置、物理上行链路控制信道(PUCCH)配置、探测参考信号(SRS)配置、上行功率控制配置的至少一种；所述第二上行载波的配置信息包括所述第二上行载波的物理上行共享信道(PUSCH)配置、物理上行链路控制信道(PUCCH)配置、探测参考信号(SRS)配置、上行功率控制配置的至少一种。
可选的，该资源配置信息包括专用随机接入资源(dedicated RACH resource)，该专用随机接入资源可以供终端设备发起基于非竞争的随机接入(contention-free random access，contention-free RA/CFRA)，具体地，该专用随机接入资源包括前导码索引(preamble index)和时频资源。
具体的，当该资源配置信息包括专用随机接入资源时，目标网络设备可以将同一份专用随机接入资源同时配置给一个common UL载波和/或至少一个SUL载波。或者，目标网络设备可以分别给common UL载波和/或至少一个SUL载波配置专用随机接入资源。
在一个具体的实现方式中，上述指示信息中可以包括所述专用随机接入资源对应的载波索引(carrier index)。具体而言，该载波索引可以显式指示该随机接入资源与上行载波的对应关系，即显式指示该专用随机接入资源对应的上行载波的索引号。这样，终端设备可以根据专用随机接入资源对应的载波索引，确定该专用随机接入资源对应的上行载波。
例如，考虑只有一个SUL载波的场景，该SUL载波的索引值为1，具体地，系统消息或RRC信令或协议规定(即协议写死)该载波的索引值，所述指示信息中可以包括专用随机接入资源，该专用随机接入资源的配置信元中包含载波索引值1。此时，该指示信息用于指示专用随机接入资源对应的上行载波为SUL载波#1。
又例如，指示信息中可以包括专用随机接入资源#1，该专用随机接入资源#1的载波索引为0、2、3，并且，载波索引0、2、3分别对应common UL载波、SUL载波#1和SUL载波#3。此时，该指示信息用于指示专用随机接入资源#1对应的上行载波为common UL载波、SUL载波#1和SUL载波#3，即目标网络设备为common UL载波、SUL载波#1和SUL载波#3分配了相同的专用随机接入资源#1。
又例如，考虑common UL载波#1、SUL载波#2和SUL载波#4的场景，具体地，系统消息或RRC信令或协议写死载波的索引值，指示信息中包括专用随机接入资源#1、#2、#3，其中：专用随机接入资源#1的配置信元中包含载波索引值1，即该指示信息用于指示专用随机接入资源#1对应的上行载波为common UL载波#1；专用随机接入资源#2的配置信元中包含载波索引值2，即该指示信息用于指示专用随机接入资源#2对应的上行载波为SUL载波#2；专用随机接入资源#3的配置信元中包含载波索引值4，即该指示信息用于指示专用随机接入资源#3对应的上行载波为SUL载波#4。
在另一个具体的实现方式中，该资源配置信息还可以包括PUCCH资源。这时，所述专用随机接入资源可以与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系，即专用随机接入资源对应配置有PUCCH资源的上行载波。也就是说，该指示信息可以隐式指示该专用随机接入资源对应哪些上行载波。
例如，指示信息中可以包括专用随机接入资源#1，并且，网络设备为common UL载波、SUL载波#1和SUL载波#3配置了PUCCH资源，网络设备通过该隐式的方式指示专用随机接入资源#1对应的上行载波为common UL载波、SUL载波#1和SUL载波#3，即目标网络设备为common UL载波、SUL载波#1和SUL载波#3分配了专用随机接入资源 #1。
在另一个具体的实现方式中，可以采用信元的方式，例如ra-PRACH-MaskIndex，来指示专用随机接入资源对应哪个上行载波，例如利用maskindex中的预留(reserved)的索引(index)进行指示。可选地，ra-PRACH-MaskIndex可以包含在所述专用随机接入资源中，该专用随机接入资源配置信息包括在上述切换消息中。
或者，可以扩展ra-PRACH-MaskIndex中的mask index的数量，并采用扩展的mask index来指示专用随机接入资源对应哪个上行载波。具体的，现有的mask index只有0～15，可以在协议中直接规定采用哪些mask index来进行指示。
或者，可以利用ra-PRACH-MaskIndex指示专用随机接入资源与上行载波的对应关系，例如，可以用mask index对应载波索引。
在另一个具体的实现方式中，可以在协议中规定默认该专用随机接入资源可以对应任意一个上行载波。
这样，通过采用上述几种方式，目标网络设备可以为至少一个上行载波分配的专用随机接入资源。相应的，终端设备可以根据该指示信息，确定该专用随机接入资源对应的至少一个上行载波。
可选的，该资源配置信息可以包括通用随机接入资源，该通用随机接入资源可以供终端设备发起基于竞争的随机接入(contention-based RA，CBRA)。具体的，切换消息可以包含随机接入信道(RACH)配置，RACH配置中可以包括该通用随机接入资源。一种可能的方式是，该通用随机接入资源对应一个common UL载波和/或至少一个SUL载波。另一种可能的方式是，有多个通用随机接入资源，分别对应一个common UL载波和/或至少一个SUL载波。
具体的，当资源配置信息包括专用随机接入资源时，终端设备优先在专用随机接入资源上发起随机接入。当资源配置信息不包括专用随机接入资源，或终端设备在专用随机接入资源上发起非竞争的随机接入失败时，终端设备可以在通用随机接入资源上发起随机接入。
220，所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。也就是说，这里该目标载波为上文中的第一上行载波或第二上行载波，即目标载波为终端设备要切换到的目标小区中的一个上行载波，即目标载波为common UL载波或SUL载波。
在一个具体的实施方式中，当资源配置信息包括专用随机接入资源时，终端设备可以根据该指示信息，确定该专用随机接入资源对应的至少一个上行载波。
作为一例，终端设备将所述专用随机接入资源对应的载波索引指示的载波确定为所述专用随机接入资源对应的至少一个上行载波。
作为另一例，终端设备根据所述专用随机接入资源与配置有所述PUCCH资源的上行载波的对应关系，将配置有PUCCH资源的上行载波确定所述专用随机接入资源对应的至少一个上行载波。
作为另一例，终端设备可以根据ra-PRACH-MaskIndex中的Mask Index指示比特位来确定该专用随机接入资源对应的至少一个上行载波。
作为另一例，终端设备可以默认该专用随机接入资源可以对应任意一个上行载波。
本申请实施例中，当所述专用随机接入资源对应的至少一个上行载波的数量为一个时，所述终端设备将该上行载波确定为所述目标载波，并在该目标载波上发起随机接入。也就是说，此时，目标网络设备仅为一个上行载波(即common UL载波或SUL载波)配置了专用随机接入资源，则终端设备采用与该上行载波对应的专用随机接入资源发起随机接入。
当所述专用随机接入资源对应的至少一个上行载波的数量为至少两个(即多个)时，所述终端设备将该至少两个上行载波中的一个确定为所述目标载波，并使用该专用随机接入资源在该目标载波上发起随机接入。也就是说，此时目标网络设备为多个上行载波(即一个common UL载波和/或至少一个SUL载波)配置专用随机接入资源。
这时，终端设备可以根据资源配置信息中的PUCCH资源来确定目标载波。具体的，终端设备可以将所述至少两个上行载波中配置有PUCCH资源的上行载波中的一个确定为所述目标载波。
具体而言，此时如果目标网络设备只给配置有专用随机接入资源的上行载波中的一个上行载波配置有PUCCH资源，则终端设备采用与配置有专用随机接入资源和PUCCH资源的载波所对应的专用随机接入资源进行随机接入。如果目标网络设备给配置有专用随机接入资源的上行载波中的多个上行载波配置有PUCCH资源，则终端设备可以采用与配置有专用随机接入资源和PUCCH资源上的多个上行载波中的一个上行载波所对应的专用随机接入资源进行随机接入。
作为另一个具体的实施例，当资源配置信息包括PUCCH资源时，所述终端设备将所述至少一个上行载波中配置有PUCCH资源的上行载波中的一个确定为所述目标载波。具体而言，此时，没有在切换请求响应或切换消息中包含专用随机接入资源，而在切换请求响应或切换消息中包括通用随机接入资源，如果指示信息中包含了一个上行载波的PUCCH资源，则终端设备在配置有PUCCH资源的上行载波上采用通用随机接入资源进行基于竞争的随机接入。如果切换请求响应或切换消息中包含给多个上行载波配置有PUCCH资源，则终端设备可以在配置有PUCCH资源上的多个上行载波中的一个上行载波上采用通用随机接入资源进行基于竞争随机接入。
可选的，本申请实施例中，当配置有PUCCH资源的上行载波的数量为至少两个时，终端设备可以在该至少两个配置有PUCCH资源的上行载波中随机选择一个上行载波作为目标载波进行随机接入，或者，终端设备可以按照网络设备配置的顺序选择，例如终端设备可以将指示信息中的第一个配置有PUCCH资源(或者配置有专用随机接入资源和PUCCH资源)的上行载波确定为目标载波进行随机接入。
可选的，本申请实施例中，当配置有PUCCH资源的上行载波数量为至少两个，所述终端设备根据对目标小区的测量结果，在所述至少两个配置有PUCCH资源的上行载波中确定所述目标载波。
可选的，本申请实施例中，所述资源配置信息包括通用随机接入资源，所述终端设备根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入，包括：所述终端设备根据对所述目标小区的测量结果，在所述至少一个上行载波中确定所述目标载波。
也就是说，当资源配置信息没有包含专用随机接入资源或PUCCH资源，即资源配置 信息仅包含通用随机接入资源，或者资源配置信息包含专用随机接入资源，但是网络设备没有采用上文所述的显式或隐式的方法指示该专用随机接入资源对应哪些或哪个上行载波。这时，网络设备发送的指示信息可以指示至少一个上行载波的通用随机接入资源。终端设备可以根据对目标小区的测量结果，在至少一个上行载波中确定所述目标载波。
这里，小区的测量结果为所述小区的小区级测量结果和/或所述小区的信号测量结果，其中，所述信号测量结果包括下行参考信号的测量结果。下行参考信号可以包括SS(包括主同步信号PSS/辅同步信号SSS)和/或CSI-RS和/或PBCH-DMRS。一种方式中，测量遵循现有的小区测量方法，如LTE系统中的小区测量技术：终端设备根据测量配置测出服务小区和/或邻区的小区级测量结果。另一种可能的方式中，由于5G新技术中引入波束概念，小区级测量结果可能是对小区中的一个或多个波束的测量结果取平均值所获得的测量结果。具体的，下行参考信号的测量结果包括参考信号接收功率(reference signal received power，RSRP)和参考信号接收质量(reference signal received quality，RSRQ)。
可选的，本申请实施例中，用于进行同步的重配置消息还包括所述阈值，该阈值用于所述终端设备根据下行参考信号的测量结果确定所述目标载波。
本申请实施例中，可以采用下面3种方式进行阈值的配置。可以理解，下述3种方式仅为举例说明，不构成对本申请实施例的任何限定。
1)、目标网络设备的系统消息中可以包含该阈值。该系统消息例如为RMSI。目前，标准中将初始接入时用于进行上行载波选择的阈值包含在系统消息中，本申请中的该阈值可以与初始接入时使用的阈值为同一阈值，即系统消息中包含的该阈值是唯一的，既可以适用于初始接入时的上行载波选择，也可以适用于切换时的上行载波选择。或者该阈值可以与初始接入时使用的阈值为不同的阈值，即系统消息中包含两个阈值，一个用于初始接入时的上行载波选择，另一个用于切换时的上行载波选择。
可理解，此时，本申请实施例中的切换消息中不包括该阈值。这时，终端设备可以根据目标网络设备广播的系统消息中所包含的阈值进行上行载波的选择。
2)、源网络设备向终端设备发送的切换消息中可以包括该阈值。具体的，该阈值可以包含在RMSI中，RMSI可选包含在切换消息中，具体地，RMSI包含阈值的方式可以如上述方式1)所述。这时，终端设备可以根据切换消息中包括的该阈值进行上行载波的选择。
3)、该阈值的大小可以预先配置给终端设备。
本申请实施例中，如果所述下行参考信号的测量结果大于或等于阈值，所述终端设备将所述第一上行载波确定为所述目标载波。如果所述下行参考信号的测量结果小于所述阈值，所述终端设备将所述第二上行载波确定为所述目标载波。这里，第一上行载波即上文中的common UL载波，第二上行载波即为上文中的SUL载波。
可选地，终端设备可以采用以下2种方法进行上行载波的选择。可以理解，下述2种方式仅为举例说明，不构成对本申请实施例的任何限定。
1)、对于有两个上行载波(且该两个上行载波为第一上行载波和第二上行载波)的情况。
如果RSRP或RSRQ大于或等于阈值，则终端设备在第一上行载波上进行随机接入。如果RSRP或RSRQ小于阈值，则终端设备在第二上行载波上进行随机接入。
2)、对于有大于两个上行载波(该至少两个上行载波为第一上行载波和至少两个第二上行载波)的情况。
如果预先配置了一个阈值，或者系统消息或切换消息中包括一个阈值，则当RSRP或RSRQ大于或等于该阈值时，终端设备在第一上行载波上进行随机接入。当RSRP或RSRQ小于阈值时，则终端设备在至少两个第二上行载波中的任意一个进行随机接入。
如果协议中规定了两个阈值，或者系统消息中包括两个阈值，则终端设备可以根据该两个阈值与测量结果，在该多个上行载波中确定一个上行载波进行随机接入。具体的，网络设备可以指示该两个阈值与上行载波选择的对应关系(也可以是协议规定，或系统消息或切换消息中指示)。例如，该两个阈值可以为第一阈值(threshold 1)和第二阈值(threshold2)，该大于两个上行载波可以包括common UL1、SUL1和SUL2。当RSRP或RSRQ小于threshold 1时，终端设备选择SUL1进行随机接入，当RSRP或RSRQ大于threshold 1且小于threshold 2时，终端设备选择SUL2进行随机接入，RSRP或RSRQ大于threshold 2时，终端设备选择common UL1进行随机接入。
如果所述终端设备使用所述专用随机接入资源在所述目标载波上进行基于非竞争的随机接入失败，所述终端设备可以使用所述通用随机接入资源在所述目标载波或不同于所述目标载波的另一个上行载波上进行基于竞争的随机接入。具体的，该另一个上行载波可以为除所述目标载波之外的其他上行载波，并且可选的，该另一上行载波可以配置有PUCCH资源。
当资源配置信息中不包括专用随机接入资源，而包括通用随机接入资源时，终端设备可以采用该通用随机接入资源在该目标载波上发起基于竞争的随机接入(CBRA)。
可选的，本申请实施例中，切换消息中还可以包含第二指示信息，该第二指示信息用于指示当所述终端设备在所述目标载波上采用功率升序(power ramping)的方式发起了X次随机接入(即当所述终端设备在所述目标载波上进行了X-1次power ramping)之后，或，当所述终端设备在所述目标载波上发起随机接入失败Y次之后，或当所述终端设备在所述目标载波上发送随机接入前导序列(preamble)Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
可理解，当所述终端设备在所述目标载波上采用功率升序(power ramping)的方式发起随机接入时，终端设备第一次进行随机接入时，可以采用较低的发射功率进行随机接入。当第一次随机接入失败时，终端设备可以以第一步长增大发射功率，然后以该增大后的发射功率在该目标载波上进行第二次随机接入。当终端设备按照上述方式将发射功率增大了X-1次(即进行了X次随机接入)之后，终端设备可以在不同于所述目标载波的另一个上行载波上进行随机接入。
另外，当终端设备在所述目标载波上发起随机接入失败Y次时，Y可以为协议规定的发起随机接入失败的最大次数。或者，Y也可以为该第二指示信息所指示的一个次数，该次数可以小于或者等于协议规定的发起随机接入失败的最大次数。并且，可以将某次随机接入过程中进行多次power ramping后随机接入没有成功的情形视为一次随机接入过程失败，本申请实施例对此不限定。
对应的，如果所述终端设备在所述目标载波上采用功率升序的方式发起了X次随机接入之后，或，如果所述终端设备在所述目标载波上发起随机接入失败Y次之后，或在所述 目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入。
应注意，本申请实施例中，在终端设备在不同于所述目标载波的另一个上行载波上进行随机接入之前，该终端设备可以已经在专用随机接入资源或通用随机接入资源上进行随机接入失败。
因此，本申请实施例中，当终端设备要切换到的目标小区中包括第一上行载波和至少一个第二上行载波，且该第一上行载波和至少一个第二上行载波对应于该目标小区中的一个下行载波时，网络设备可以向终端设备发送包括第一上行载波和/或第二上行载波中的至少一个上行载波的资源配置信息，使得终端设备可以根据该至少一个上行载波的资源配置信息，在至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
应理解，这里的网络设备可以为目标网络设备或源网络设备，具体而言，目标网络设备可以向源网络设备发送包含该资源配置信息的切换请求响应，源网络设备收到该切换请求响应之后，向终端设备发起切换消息，该切换消息中包括该资源配置信息。
图3示出了本申请实施例提供的另一种通信方法的示意性交互流程图。应理解，图3示出了该通信方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图3中的各个操作的变形。此外，图3中的各个步骤可以按照与图3呈现的不同的顺序来执行，并且有可能并非要执行图3中的全部操作。
310，终端设备向源网络设备(例如源gNB)发送测量报告。
具体的，终端设备对服务小区和/或邻区进行测量，向源网络设备发送测量报告，该测量报告包括服务小区和/或邻区的测量结果。具体的，小区的测量结果可以参见图2中的描述，为避免重复，这里不再赘述。
源网络设备根据终端设备上报的测量报告或根据其他信息，进行切换判决，确定出目标小区后，向目标小区所属的网络设备即目标网络设备发送切换请求消息。
320，源网络设备向目标网络设备发送切换请求，该切换请求包含终端设备在测量报告中上报的测量结果，该测量结果包括目标小区的测量结果，可选包括目标小区的信号测量结果。
具体的，该测量结果可以包含在切换请求消息中的RRC容器(RRC container)中，或者该测量结果也可以是Xn接口的一个接口信元，并且该信元包含在切换请求消息中。
330，目标网络设备根据阈值和上述测量结果，确定上行载波配置。
具体的，上行载波配置包括至少一个上行载波的资源配置信息。这里，该至少一个上行载波包括第一上行载波和/或至少一个第二上行载波(即common UL载波和至少一个SUL载波)。具体的，第一上行载波和第二上行载波的描述可以参见上文中的描述，为避免重复，这里不再赘述。
本申请实施例中，上行载波配置包括一个上行载波的资源配置信息，该资源配置信息可以包括专用随机接入资源和/或PUCCH资源。
具体的，当目标网络设备支持至少两个上行载波时，目标网络设备可以为其中一个上行载波配置专用随机接入资源。在一种具体的实现方式中，当目标小区的测量结果RSRP或RSRQ大于或等于阈值时，目标网络设备为第一上行载波配置专用随机接入资源。当目标小区的测量结果RSRP或RSRQ小于阈值时，目标网络设备为至少一个第二上行载波中 的一个配置专用随机接入资源。可选的，此时网络设备还可以为该上行载波配置PUCCH资源。
或者，当目标网络设备支持至少两个上行载波时，目标网络设备可以没有配置任何专用随机接入资源，但为其中一个上行载波配置PUCCH资源。在一种具体的实现方式中，当对目标小区的测量结果RSRP或RSRQ大于或等于阈值时，目标网络设备为第一上行载波配置PUCCH资源。当对目标小区的测量结果RSRP或RSRQ小于阈值时，目标网络设备为至少一个第二上行载波中的一个配置PUCCH资源。
可选的，目标网络设备为终端设备配置的随机接入资源还有以下6种可能的情况。
1)、目标网络设备支持两个上行载波(一个common UL carrier和一个SUL carrier)，且为这两个上行载波中的每个上行载波都配置了专用随机接入资源。
2)、目标网络设备支持两个上行载波(一个common UL carrier和一个SUL carrier)，目标网络设备没有为这两个上行载波配置任何专用随机接入资源，但分别为这两个上行载波配置PUCCH配置。
3)、目标网络设备支持大于两个上行载波(一个common UL carrier和至少一个SUL carrier)，目标网络设备为所有上行载波都配置了专用随机接入资源。
4)、目标网络设备支持大于两个上行载波(一个common UL carrier和至少一个SUL carrier)，第二网络设备为其中一个或一部分(即该至少两个上行载波中的部分)上行载波配置了专用随机接入资源。
5)、目标网络设备支持大于两个上行载波(一个common UL carrier和至少一个SUL carrier)，第二网络设备没有配置任何专用随机接入资源，但分别为每个上行载波配置PUCCH配置。
6)、目标网络设备支持大于两个上行载波，目标网络设备没有配置任何专用随机接入资源，但为其中一个或一部分上行载波的PUCCH配置。
可选的，本申请实施例中，切换消息中还可以包含第二指示信息，该第二指示信息用于指示当所述终端设备在所述目标载波上采用功率升序(power ramping)的方式发起了X次随机接入(即当所述终端设备在所述目标载波上进行了X-1次power ramping)之后，或，当所述终端设备在所述目标载波上发起随机接入失败Y次之后，或当所述终端设备在所述目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
340，目标网络设备向源网络设备发送切换请求响应，该切换请求响应中包含目标网络设备确定的上行载波的资源配置信息。
350，源网络设备向终端设备发送切换消息，该切换消息包含目标网络设备确定的上行载波的资源配置信息。
具体的，340和350中的资源配置信息可以参见330中的描述，为避免重复，这里不再赘述。
终端设备在接收到源网络设备发送的至少一个上行载波的资源配置信息之后，对应于资源配置的不同情况可以有相应的不同的行为。
作为一例，如果至少一个上行载波的资源配置信息包括一个上行载波的专用随机接入资源时，终端设备可以优先使用与该载波对应的该专用随机接入资源进行随机接入。如果 随机接入失败，终端设备则使用通用随机接入资源继续在该载波上进行随机接入。并且，如果终端设备在该载波上采用通用随机接入资源进行的基于竞争的随机接入失败，则终端设备可以在除该载波之外的另一个上行载波上使用通用随机接入资源进行基于竞争的随机接入。
作为另一例，如果至少一个上行载波的资源配置信息不包括任何专用随机接入资源，只包含其中一个上行载波的PUCCH配置。用户终端仅能在存在PUCCH配置的上行载波上使用通用随机接入资源进行基于竞争的随机接入。如果基于竞争的随机接入失败，终端设备可以发起RRC连接重建立流程，或使用另一上行载波的通用随机接入资源进行随机接入。
作为另一例，对于上述6种情况中的第1)种情况，如果目标网络设备为两个上行载波都配置了专用随机接入资源，则终端设备可以采用以下4种方式中的任意一种：
1)根据目标网络设备配置的顺序进行选择。
2)随机进行选择。
3)优先使用最先到达的专用随机接入资源并选择该专用随机接入资源所对应的上行载波。
4)如果目标网络设备提供了另外的阈值(独立于网络侧进行判决的阈值，如切换请求响应消息和切换消息中包含另一阈值)，终端设备根据阈值与目标小区的测量结果再进行一次判决。具体的，当目标小区的下行信号的测量结果RSRP或RSRQ大于或等于阈值时，使用第一上行载波(common UL载波)相应的专用随机接入资源进行随机接入。如果目标小区的下行信号的测量结果RSRP或RSRQ小于阈值，使用第二上行载波(SUL载波)相应的专用随机接入资源进行随机接入。或者，当切换请求响应消息/切换消息没有包含阈值时，终端设备根据RMSI中的阈值与目标小区的测量结果再进行一次判决。
作为另一例，对于上述6种情况中的第2)种情况，如果目标网络设备支持两个上行载波(NR UL carrier和SUL carrier)，目标网络设备没有配置任何专用随机接入资源，但分别为两个上行载波配置PUCCH配置，则终端设备可以采用以下4种方式中的任意一种：
1)根据目标网络设备配置的顺序进行选择；
2)随机进行选择；
3)优先使用最先到达的通用随机接入资源并选择该通用随机接入资源所对应的上行载波。
4)如果目标网络设备提供了另外的阈值(独立于网络侧进行判决的阈值，如切换请求响应消息和切换消息中包含另一阈值)，终端设备根据阈值与目标小区的测量结果再进行一次判决。具体的，当目标小区的下行信号的测量结果RSRP或RSRQ大于或等于阈值时，使用第一上行载波(common UL载波)相应的通用随机接入资源进行随机接入。如果目标小区的下行信号的测量结果RSRP或RSRQ小于阈值，使用第二上行载波(SUL载波)相应的通用随机接入资源进行随机接入。或者，当切换请求响应消息/切换消息没有配置阈值时，终端设备根据RMSI中的阈值与目标小区的测量结果再进行一次判决。
作为另一例，对于上述6种情况中的第3)种情况，如果目标网络设备支持大于两个上行载波(一个NR UL carrier和至少一个SUL carrier)，目标网络设备为所有上行载波都配置了专用随机接入资源，则终端设备可以采用以下4种方式中的任意一种：
1)根据目标网络设备配置的顺序进行选择；
2)随机进行选择；
3)优先使用最先到达的专用随机接入资源并选择该资源所对应的上行载波。
4)如果目标网络设备提供了另外的阈值(独立于网络侧进行判决的阈值，如切换请求响应消息和切换消息中包含另一阈值)，则所述阈值可以包括一个阈值或多个阈值的情况。
此时，如果协议规定了一个阈值，或系统消息或切换消息中包含了一个阈值，则当目标小区的下行信号的测量结果RSRP或RSRQ大于或等于阈值时，使用第一上行载波对应的随机接入资源发起随机接入。当目标小区的下行信号的测量结果RSRP或RSRQ小于阈值时，使用其余上行载波中任意一个的随机接入资源发起随机接入。
如果协议规定了多个阈值，或系统消息中或切换消息中包含多个阈值，网络设备可以指示这两个阈值与上行载波选择的对应关系(也可以是协议规定或系统消息中或切换消息中指示)。例如，网络设备支持的所有的上行载波包括：common UL1、SUL1和SUL2，该多个阈值为：threshold 1和threshold 2。当RSRP或RSRQ小于threshold1时，终端设备选择SUL1进行随机接入。当RSRP或RSRQ大于threshold 1且小于threshold 2时，终端设备选择SUL2进行随机接入。当RSRP或RSRQ大于threshold 2时，终端设备选择common UL1进行随机接入。
作为另一例，对于上述6种情况中的第4)种情况，由于目标网络设备支持大于两个上行载波，且目标网络设备为一个或多个上行载波配置了专用随机接入资源。此时终端设备优先使用专用随机接入资源进行随机接入。如果有多个专用随机接入资源对应多个上行载波，则终端设备可以采用以下3种方式中的任意一种：：
1)根据目标网络设备配置的顺序进行选择；
2)随机进行选择；
3)优先使用最先到达的专用随机接入资源并选择该资源所对应的上行载波进行随机接入。
在这种情况下，如果采用专用资源进行随机接入失败，则改用通用随机接入资源继续在该载波上进行随机接入。
这时，终端设备还可以根据网络设备发送的第二指示信息进行随机接入，即终端设备在通用随机接入资源上发起随机接入进行X次power ramping(以步进方式提升随机接入消息1的发送功率)后，使用另一个上行载波进行随机接入。或，终端设备在通用随机接入资源上发起随机接入失败Y次后，使用另一个上行载波进行随机接入。
作为另一例，对于上述6种情况中的第5)种情况，终端设备在配置有PUCCH资源的上行载波上采用通用随机接入资源发起随机接入时，终端设备可以采用以下3种方式中的任意一种：
1)根据目标网络设备配置的顺序进行选择；
2)随机进行选择；
3)优先使用最先到达的PUCCH资源并选择该资源所对应的上行载波进行随机接入。
作为另一例，对于上述6种情况中的第6)种情况，如果目标网络设备指出大于两个上行载波，目标网络设备没有配置任何专用随机接入资源，但为其中一个或一部分上行载 波的配置了PUCCH资源，终端设备可以采用以下3种方式中的任意一种：
1)随机选择上行载波；
2)按照目标网络设备配置的上行载波的顺序进行选择；
3)根据目标网络预配置的阈值进行判决，从而决定进行随机接入的上行载波。
因此，本申请实施例中，当终端设备要切换到的目标小区中包括第一上行载波和至少一个第二上行载波，且该第一上行载波和至少一个第二上行载波对应于该目标小区中的一个下行载波时，目标网络设备可以根据终端设备发送的测量结果和阈值确定该至少一个上行载波的资源配置信息，并将该资源配置信息发送给终端设备，使得终端设备可以在根据该至少一个上行载波的资源配置信息，在该至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
图4示出了本申请实施例提供的另一种通信方法的示意性交互流程图。应理解，图4示出了该通信方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图4中的各个操作的变形。此外，图4中的各个步骤可以按照与图4呈现的不同的顺序来执行，并且有可能并非要执行图4中的全部操作。
410目标网络设备(例如Target gNB)向源网络设备(例如Source gNB)发送阈值，该阈值用于进行上行载波的选择。具体的，这里的阈值可以参见上文中对阈值的描述，为避免重复，这里不再赘述。
420，终端设备向源网络设备发送测量报告。具体的，该测量报告可以参见上文中的描述，为避免重复，这里不再赘述。
这里，步骤410和步骤420的逻辑顺序可以互换，即目标网络设备向源网络设备发送阈值可以发生在终端设备向源网络设备发送测量报告之前，也可以发生在终端设备向源网络设备发送测量报告之后。
430，源网络设备根据阈值和终端设备上报的测量结果，在至少一个上行载波中确定目标载波。
这里，至少一个上行载波属于目标网络设备的目标小区(即终端设备即将要切换到的小区)。具体的，该至少一个上行载波包括第一上行载波和至少一个第二上行载波，该目标载波即为第一上行载波或第二上行载波。具体的，至少一个第一上行载波和目标载波可以参见上文中的描述，为避免重复，这里不再赘述。
440，源网络设备向目标网络设备发送切换请求，该切换请求中包括430中确定的目标载波的信息，即切换请求中可以包括用于指示目标网络设备为第一上行载波或第二上行载波进行资源配置的信息。
450，目标网络设备根据切换请求消息中包括的用于指示目标网络设备为第一上行载波或第二上行载波进行资源配置的信息，为第一上行载波或第二上行载波进行资源配置，且向源网络设备发送切换请求响应，切换请求响应中包含确定的目标载波的资源配置信息。
具体的，切换请求响应可以参见上文中的切换请求响应的描述，为避免重复，这里不再赘述。
460，源网络设备向终端设备发送切换消息。
具体的，切换消息可以参见步骤450中的切换请求响应的描述，为避免重复，这里不 再赘述。
并且，终端设备在接收到源网络设备发送的切换消息之后，根据切换消息中的资源配置信息的具体情况，可以有相应的不同行为。具体的，终端设备的具体行为可以参见上文中的描述，为避免重复，这里不再赘述。
因此，本发明实施例中，当终端设备要切换到的目标小区中包括第一上行载波和至少一个第二上行载波，且该第一上行载波和至少一个第二上行载波对应于该目标小区中的一个下行载波时，源网络设备可以根据终端设备发送的测量结果和目标网络设备发送的阈值确定目标网络设备需要进行资源配置的至少一个上行载波，并且指示目标网络设备为确定的该至少一个上行载波进行资源配置。然后目标网络设备根据切换请求消息中包括的指示信息，为确定的至少一个上行载波进行资源配置，且将确定的至少一个上行载波的资源配置信息包含在切换请求响应消息中发送给源网络设备，源网络设备将该资源配置信息发送给终端设备，使得终端设备根据该至少一个上行载波的资源配置信息，在该至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
本申请实施例中，切换消息中可以包含带宽部分(Bandwidth Part，BWP)和SUL carrier的相关的信元。
具体的，对于下行传输，切换消息中可以包含下行链路(downlink，DL)配置信息，DL配置信息包括DL公共配置信息和下行BWP配置信息。其中，所述下行BWP配置信息包括以下信息中的至少一种：频点、带宽、频偏。进一步的，下行BWP配置信息中还可以包括物理信息配置，例如包括PDCCH配置和PDSCH配置中的至少一种。
对于上行传输，切换消息中可以包含上行链路UL配置信息。具体的，这里以上行载波包括一个common UL载波和一个SUL为例进行说明。
在一种可能的实现方式中，系统消息、专用RRC消息中可以包含common UL载波和SUL载波的索引值，或直接在协议中规定common UL载波和SUL载波的索引值。例如common UL carrier对应index0，SUL carrier对应index1。此时，切换消息中可以包含专用随机接入信道RACH配置，专用RACH配置可以用于指示专用随机接入资源与上行载波的关联关系，如在专用RACH配置的信元中包含载波索引(carrier index)，例如，专用随机接入资源对应common UL carrier，则专用RACH配置中包含载波索引值index0。
另外，本申请实施例中，由于SUL carrier以及common UL carrier可能支持一个或多个BWP(具体的可以采用专用RRC消息或系统消息配置BWP索引值)。
作为一例，当common UL carrier支持一个或多个BWP时，需要指示对应common UL carrier的专用随机接入资源对应该载波下的哪个BWP。例如，专用随机接入资源对应NR UL carrier的BWP1，则专用RACH配置中除包含载波索引值index0外，还需要包含BWP索引值BWP1。这样，终端设备在接收到切换消息之后，可以采用对应common UL carrier的BWP1频段的专用随机接入资源进行随机接入。
可理解，以上是以common UL carrier为例进行说明，本申请实施例的配置方法同样可以适用于SUL carrier。
并且，可选的，切换消息中除了包括专用RACH配置之外，还可以包括common UL载波和SUL载波的公共配置信息，以及common UL载波和SUL载波的专用配置信息。具体的，公共配置信息可以包括PUCSH配置、PUCCH配置、SRS配置、上行功率控制 配置等中的至少一种。专用配置信息可以包括PUCSH配置、PUCCH配置、SRS配置、上行功率控制配置等中的至少一种。
在另一种可能的实施方式中，切换消息中可以包含上行链路UL配置信息，UL配置信息包括common UL载波的公共配置信息和SUL载波的公共配置信息，以及common UL载波的专用配置信息和SUL载波的专用配置信息。
这里，SUL carrier以及common UL carrier可以支持一个或多个BWP，此时专用配置信息中还可以包括BWP配置。具体的，可以采用专用RRC消息或系统消息来配置BWP的索引值。可选的，所述上行BWP配置可以包括以下至少一种：频点、带宽、频偏、PUCSH配置、PUCCH配置、SRS配置和上行功率控制配置。
作为一例，common UL carrier支持BWP1和BWP2，SUL carrier支持BWP1’和BWP2’。此时，可选地，专用RACH配置可以包含在BWP的配置中。例如，专用RACH配置可以包含在NR UL carrier的BWP1配置中，则终端设备采用对应common UL carrier的BWP1频段的专用随机接入资源进行随机接入。可选的，如果common UL carrier不支持BWP，专用RACH配置可以包含在common UL的专用配置信息中，例如专用RACH配置可以包含在common UL carrier的专用配置中，则终端设备采用对应common UL carrier的专用随机接入资源进行随机接入。
可理解，以上是以NR UL carrier为例，上述的配置方法同样适用于SUL carrier。
可选地，本申请实施例中，上行配置还可以包括半静态调度(Semi－Persistent Scheduling,SPS)配置和/或免授权(Grant Free，GF)配置。具体的，如果为同一个终端设备在common UL载波和SUL载波上都配置了GF/SPS资源，则需要保证common UL载波和SUL载波上配置的GF/SPS资源在时域上错开。如果只在一个UL载波上配置了GF/SPS资源，而另一个UL载波上没有配置，例如，在SUL上配置了GF/SPS资源，而common UL上没有配置，则在common UL上对所述终端设备进行调度时需要避开SUL上配置的GF/SPS资源所对应的时隙。
同样的，在双连接(dual connectivity，DC)场景下进行辅站添加时，这里的辅站支持配SUL carrier，如辅站的主辅小区PSCell(或辅小区SCell)配有SUL carrier，则可以采用RRC重配置消息配置终端设备。同样地，RRC重配置消息的具体配置方式同上述的切换消息的配置方式。
上文中结合图2至图4，详细描述了在切换场景下如何选择上行载波进行随机接入。应注意，本申请实施例的方法同样适用于双连接的场景。具体的，切换场景下的源网络设备可以对应于双连接场景下的主基站，切换场景下的目标网络设备可以对应于双连接场景下的辅基站。应理解，这里相对应两个设备可以执行相同或相似的操作。并且，切换场景下的切换消息与双连接场景下的RRC连接重配置消息均可以包括上文中所述的各个指示信息。
下文将结合图5和图6，详细描述在双连接DC场景下进行辅站添加时，如何对辅站的上行载波进行配置的方法。
图5示出了本申请实施例提供的用于辅站添加的方法的示意性流程图。应理解，图5示出了添加辅站的方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图5中的各个操作的变形。此外，图5中的各个步骤可以按照与图5呈 现的不同的顺序来执行，并且有可能并非要执行图5中的全部操作。
510，终端设备向主节点(Master Node，MN)发送测量报告。
其中，MN可以为NR制式的主基站MgNB或LTE制式的主基站MeNB。
具体的，该测量报告包括终端设备对服务小区和/或邻区的测量结果。具体的，该测量结果可以参见上文中对测量结果的描述，为避免重复，这里不再赘述。
520，MN向辅节点(Secondary Node，SN)发送辅站添加请求消息。
其中，SN可以是NR制式的辅基站SgNB。
具体的，MN在收到终端设备发送的测量报告之后，向SN发送辅站添加请求，该辅站添加请求消息中包含上述510步骤中终端设备上报的测量结果，该测量结果包括属于SN的小区的小区级的RSRP和/或RSRQ，或者包括该小区的信号测量结果RSRP和/或RSRQ)。
530，SN根据用于选择上行载波的阈值和测量结果，确定辅小区组(Secondary Cell Group，SCG)的配置。
具体的，若测量结果低于该阈值，可以基于以下2中方式配置SCG。
1)、SN只给SUL carrier配置无线资源配置。
例如，SN只为SUL carrier配置专用RACH配置，该专用RACH配置包括前导码序列索引(preamble index)和时频资源，还可以包括PUCCH配置、PUSCH配置、上行功率控制配置中的至少一种。
2)、SN为SUL carrier和common UL carrier都进行无线资源配置，
若测量结果高于该阈值，可以基于以下两种方式配置SCG。
1)、SN只给common UL carrier配置无线资源配置。该专用RACH配置包括前导码序列索引(preamble index)和时频资源，还可以包括PUCCH配置、PUSCH配置、上行功率控制配置中的至少一种。
2)、SN为SUL carrier和common UL carrier都进行无线资源配置
540，SN向MN发送辅站添加请求响应，该请求响应中包含相应的上行载波的相关配置。
550，MN向终端设备发送RRC连接重配置消息，该请求响应中包含相应的上行载波的相关配置。
具体的，对于测量结果低于阈值时的第1)种配置方式，在辅站添加请求确认消息中包含对应SUL carrier的无线资源配置。MN收到辅站添加请求确认消息后，在第一RRC连接重配置消息中包含对应SUL carrier的无线资源配置。终端设备收到第一重配置消息后采用对应SUL carrier的无线资源配置与SN建立RRC连接(如采用与SUL carrier对应的专用RACH配置与辅站下的主辅小区PSCell进行随机接入，采用SUL carrier的PUCCH/PUSCH等配置与辅站进行数传)，与MN和SN建立DC模式。
若网络侧改变配置策略，MN/SN给终端设备发送第二重配置消息(如，第二重配消息中包含更新的对应SUL carrier的无线资源配置(如不止一个SUL时，换SUL的情形或只有一个SUL给该SUL配置一套新的无线资源配置的情形)或者包含对应common UL carrier的无线资源配置(如下行测量结果变好(高于阈值)网络侧决定让终端设备使用对应UL carrier的无线资源配置与SN进行通信))，终端设备收到第二重配置消息后使用 新的配置与SN进行通信。
对于测量结果低于阈值时的第2)种配置方式，SN在辅站添加请求确认消息中携带对应common UL carrier和SUL carrier的无线资源配置且SN指示终端设备使用对应SUL carrier的无线资源配置与SN建立RRC连接，MN收到辅站添加请求确认消息后，在第一RRC连接重配置消息中携带对应common UL carrier和SUL carrier的无线资源配置，且可选，可以包括用于指示终端设备使用对应SUL carrier的无线资源配置与SN建立连接的指示信息。
可选地，辅站添加请求确认消息/RRC连接重配置消息中包含用于选择上行carrier的阈值，终端设备在收到RRC连接重配置消息后，若检测到属于辅站的小区(PSCell和/或Scell)的下行测量结果RSRP高于该阈值，终端设备可以进行改变，使用对应common UL carrier的无线资源配置与SN进行通信。或者，MN/SN给终端设备发送第二重配置消息(如，重配消息中携带更新的对应SUL(如不止一个SUL时，换SUL的情形或只有一个SUL给该SUL配置一套新的无线资源配置的情形)和/或common UL carrier的无线资源配置，以及携带指示信息用于指示终端设备使用对应SUL carrier/common UL carrier的无线资源配置与SN建立连接)，终端设备收到该重配置消息后使用新的配置与SN进行通信。
这时，若属于辅站的小区(PSCell和/或Scell)的下行测量结果RSRP仍然低于第一重配置消息中的阈值或终端设备没有收到第二重配置消息，则终端设备采用第一RRC连接重配置消息中包含的对应SUL carrier的无线资源配置与SN进行通信。
对于测量结果高于阈值时的第1)种配置方式，在辅站添加请求确认消息中包含对应common UL carrier的无线资源配置，MN收到辅站添加请求确认消息后，在第一RRC连接重配置消息中包含对应common UL carrier的无线资源配置，终端设备收到第一重配置消息后采用对应common UL carrier的无线资源配置与SN建立RRC连接(如采用common UL carrier的专用RACH配置与辅站下的主辅小区PSCell进行随机接入，采用common UL carrier的PUCCH/PUSCH等配置与辅站进行数传)，与MN和SN建立DC模式。
若网络侧改变配置策略，MN/SN给终端设备发送第二重配置消息(如，第二重配消息中包含更新的对应common UL carrier的无线资源配置(如给该common UL carrier配置一套新的无线资源配置)或者包含对应SUL carrier的无线资源配置(当common UL carrier超负荷或下行测量结果变差(低于阈值)网络侧决定让终端设备使用对应SUL carrier的无线资源配置与SN进行通信，若不止一个SUL，则为多个SUL进行配置，每个SUL carrier配有自己的无线资源配置，网络设备(MN/SN)指定终端设备使用哪个SUL carrier的无线资源配置或终端设备自己选择))，终端设备收到第二重配置消息后使用相应的配置与SN进行通信。
对于测量结果高于阈值时的第2)种配置方式，SN在辅站添加请求确认消息中携带对应common UL carrier和SUL carrier的无线资源配置且SN指示终端设备使用对应哪个carrier(是SUL carrier还是common UL carrier)的无线资源配置与SN建立RRC连接。MN收到辅站添加请求确认消息后，在第一RRC连接重配置消息中携带对应common UL carrier和SUL carrier的专用无线资源配置，且可选的，可以包含用于指示终端设备使用对应哪个carrier的无线资源配置与SN建立连接的指示信息。
可选地，辅站添加请求确认消息/第一RRC连接重配置消息中包含用于选择上行 carrier的阈值，终端设备在收到第一RRC连接重配置消息后，基于阈值和测量得到的属于辅站的小区(PSCell和/或Scell)的下行测量结果进行进一步判决。若低于该阈值，终端设备使用对应SUL carrier的无线资源配置与SN进行通信。或者，MN/SN给终端设备发送第二重配置消息(如，重配消息中包含更新的对应SUL(如不止一个SUL时，换SUL的情形或只有一个SUL给该SUL配置一套新的无线资源配置的情形)和/或更新的common UL carrier的无线资源配置，以及包含指示信息用于指示终端设备使用对应哪个carrier的无线资源配置与SN建立连接)，终端设备收到该重配置消息后根据指示使用新的配置与SN进行通信。
因此，本申请实施例中，在DC场景下，当辅站支持SUL载波(如辅站的主辅小区PSCell或Scell配置有SUL载波时)，辅基站可以根据终端设备对辅基站的小区的测量结果和阈值来进行资源配置，该资源配置包括至少一个上行载波的资源配置信息，这里该至少一个上行载波包括common UL载波或SUL载波。终端设备接收到该至少一个上行载波的资源配置信息之后，可以在该至少一个上行载波中确定一个目标载波进行接入，实现与MN和SN的双连接。
图6示出了本申请实施例提供的用于辅站添加的方法的示意性流程图。应理解，图6示出了添加辅站的方法的步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其他操作或者图6中的各个操作的变形。此外，图6中的各个步骤可以按照与图6呈现的不同的顺序来执行，并且有可能并非要执行图6中的全部操作。本申请实施例中，MN和SN可以与图5中为具有相同或相似功能的设备。
610，SN向MN发送阈值。
具体的，SN可以通过X2/Xn接口提前将用于选择上行载波的阈值发送给MN。具体的，这里的阈值可以参见上文中对阈值的描述，为避免重复，这里不再赘述。
620，终端设备向MN发送测量报告。具体的，该测量报告可以参见上文中的描述，为避免重复，这里不再赘述。
这里，步骤610和步骤620的逻辑顺序可以互换，即SN向MN发送阈值可以发生在终端设备向MN发送测量报告之前，也可以发生在终端设备向MN发送测量报告之后。
630，MN根据阈值和测量结果确定SN配置。
MN收到终端设备发送的测量报告和SN发送的阈值之后，根据该阈值和测量结果确定SN的配置。这里，该测量结果包括小区级的RSRP和/或RSRQ，或者包括该小区的波束(beam)级的测量结果RSRP和/或RSRQ)。
具体的，若测量结果低于阈值，则MN可以指示SN只给SUL载波配置无线资源配置。
若测量结果高于阈值，则MN可以指示SN只为common UL载波配置无线资源配置。或者，MN可以指示SN为SUL载波和common UL载波都进行无线资源配置。
640，MN向SN发送辅站添加请求。
当MN指示SN只给SUL载波配置无线资源配置时，MN在辅站添加请求消息中携带指示信息，该指示信息用于指示SN只为SUL carrier配置无线资源配置。
当MN指示SN只为common UL载波配置无线资源配置时，MN在辅站添加请求中携带指示信息，该指示信息用于指示SN只为common UL载波配置无线资源配置。
当MN指示SN为SUL载波和common UL载波都进行无线资源配置时，MN在辅站添加请求中携带指示信息，该指示信息用于指示SN为SUL载波和common UL载波都进行无线资源配置。
650，SN向MN发送辅站添加请求响应。
当辅站添加请求消息中包括用于指示SN只为SUL carrier配置无线资源配置的指示信息时，SN只为SUL carrier配置无线资源配置，该无线资源配置例如包括专用RACH配置，专用RACH配置包括preamble index和时频资源，还可以包括PUCCH配置、PUSCH配置、上行功率控制配置中的至少一种。相应的，SN在辅站添加请求确认消息中携带对应SUL carrier的无线资源配置。
当辅站添加请求消息中包括用于指示SN只为common UL carrier配置无线资源配置的指示信息时，SN只为common UL carrier配置无线资源配置，该无线资源配置例如包括专用RACH配置，专用RACH配置包括preamble index和时频资源，还可以包括PUCCH配置、PUSCH配置、上行功率控制配置中的至少一种。相应的，SN在辅站添加请求确认消息中携带common UL carrier的无线资源配置。
当辅站添加请求消息中包括用于指示SN为SUL carrier和common UL carrier配置无线资源配置的指示信息时，SN在辅站添加请求确认消息中携带对应common UL carrier和SUL carrier的无线资源配置，该无线资源配置例如包括专用RACH配置，专用RACH配置包括preamble index和时频资源，还可以包括PUCCH配置、PUSCH配置、上行功率控制配置中的至少一种。且SN指示终端设备使用对应哪个carrier(SUL carrier还是common UL carrier)的无线资源配置与SN建立RRC连接。
660，MN向终端设备发送RRC连接重配置消息。
当辅站添加请求确认消息指示SN只为SUL carrier配置无线资源配置时，MN在第一RRC连接重配置消息中携带对应SUL carrier的无线资源配置。终端设备收到第一重配置消息后采用对应SUL carrier的无线资源配置与SN建立RRC连接。如采用SUL carrier的专用RACH配置与辅站下的主辅小区PSCell进行随机接入，采用SUL carrier的PUCCH/PUSCH等配置与辅站进行数传，与MN和SN建立DC模式。
若网络侧改变配置策略，MN或SN给终端设备发送第二重配置消息。例如，第二重配消息中包含更新的对应SUL carrier的无线资源配置，如不止一个SUL载波时，换SUL载波的情形或只有一个SUL载波给该SUL载波配置一套新的无线资源配置的情形。或者，包含对应common UL carrier的无线资源配置(当下行测量结果变好(高于阈值)，网络侧决定让终端设备使用对应common UL carrier的无线资源配置与SN进行通信))，终端设备收到第二重配置消息后使用新的配置与SN进行通信。
当辅站添加请求确认消息指示SN只为common UL carrier配置无线资源配置时，在第一RRC连接重配置消息中包含common UL carrier的无线资源配置。终端设备收到第一重配置消息后采用对应common UL carrier的无线资源配置与SN建立RRC连接。如采用common UL carrier的专用RACH配置与辅站下的主辅小区PSCell进行随机接入，采用common UL carrier的PUCCH/PUSCH等配置与辅站进行数传)，与MN和SN建立DC模式。
若网络侧改变配置策略，MN/SN给终端设备发送第二重配置消息。例如，第二重配 消息中包含更新的对应common UL carrier的无线资源配置，如给该common UL carrier配置一套新的无线资源配置，或者包含对应SUL carrier的无线资源配置。当common UL carrier超负荷或下行测量结果变差(低于阈值)网络侧决定让终端设备使用对应SUL carrier的无线资源配置与SN进行通信。若不止一个SUL载波，则为多个SUL载波进行配置，每个SUL carrier配有自己的无线资源配置，网络指定终端设备使用哪个SUL carrier的无线资源配置或终端设备自己选择。终端设备收到第二重配置消息后使用相应的配置与SN进行通信。
当辅站添加请求确认消息指示SN为SUL carrier和common UL carrier配置无线资源配置时，在第一RRC连接重配置消息中包含对应common UL carrier和SUL carrier的专用无线资源配置，且可选地，还可以包含用于指示终端设备使用对应哪个carrier的无线资源配置与SN建立连接的指示信息。
可选地，辅站添加请求确认消息或第一RRC连接重配置消息中包含用于选择UL carrier的阈值。终端设备在收到第一RRC连接重配置消息后，基于阈值和测量得到的属于辅站的小区(PSCell和/或Scell)的下行测量结果进行进一步判决。若低于该阈值，终端设备使用对应SUL carrier的无线资源配置与SN进行通信。或者，MN/SN给终端设备发送第二重配置消息。例如，重配消息中包含更新的对应SUL载波(如不止一个SUL载波时，换SUL载波的情形或只有一个SUL载波给该SUL载波配置一套新的无线资源配置的情形)和/或更新的common UL carrier的无线资源配置，以及包含用于指示终端设备使用对应哪个carrier的无线资源配置与SN建立连接指示信息。终端设备收到该重配置消息后根据指示使用新的配置与SN进行通信。
因此，本申请实施例中，在DC场景下，当辅站支持SUL载波(如辅站的主辅小区PSCell或Scell配置有SUL载波时)，MN可以根据终端设备对SN的小区的测量结果和SN发送的阈值选至少一个载波，并指示SN为该至少一个载波进行配置。然后SN确定该至少一个上行载波的资源配置信息，这里SN确定的该至少一个上行载波包括common UL载波和/或SUL载波。终端设备接收到确定的该至少一个上行载波的资源配置信息之后，可以在该至少一个上行载波中确定一个目标载波进行接入，实现与MN和SN的双连接。
图7示出了本申请实施例提供的一种终端设备700的示意性框图，该终端设备700包括接收单元710和处理单元720。
接收单元710，用于接收网络设备发送的指示信息，所述指示信息用于指示至少一个上行载波的资源配置信息，所述至少一个上行载波包括第一上行载波和/或至少一个第二上行载波，其中，所述第一上行载波和所述至少一个第二上行载波为所述网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述至少一个第二上行载波对应于所述小区中的一个下行载波。
例如，所述指示信息用于指示第一上行载波或者第二上行载波的资源配置信息，其中，所述第一上行载波和所述第二上行载波为所述网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述第二上行载波对应于所述小区中的一个下行载波。
处理单元720，用于根据所述至少一个上行载波的资源配置信息，在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
例如，所述处理单元720用于根据所述指示信息确定目标载波，所述处理单元720还 用于以所述目标载波发起随机接入。
可选的，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息，当所述资源配置信息没有包含专用随机接入资源时，所述处理单元具体用于：
如果确定下行参考信号的测量结果大于或等于阈值，确定所述第一上行载波为所述目标载波；或
如果确定下行参考信号的测量结果小于阈值，确定所述第二上行载波为所述目标载波。
可选的，所述第一上行载波的配置信息和所述第二上行载波的配置信息包括各自的物理上行共享信道PUSCH配置、物理上行链路控制信道PUCCH配置、探测参考信号SRS配置、上行功率控制配置的至少一种。
可选的，所述用于进行同步的重配置消息还包括所述阈值。
可选的，所述资源配置信息包括专用随机接入资源，所述处理单元720具体用于：
根据所述指示信息，确定所述专用随机接入资源对应的所述至少一个上行载波；
如果所述至少一个上行载波的数量为一个，将所述上行载波确定为所述目标载波；
如果所述至少一个上行载波的数量为至少两个，将所述至少两个上行载波中的一个确定为所述目标载波。
可选的，所述指示信息中包括所述专用随机接入资源对应的载波索引；其中，所述处理单元720具体用于：将所述专用随机接入资源对应的载波索引指示的载波确定为所述专用随机接入资源对应的至少一个上行载波。
可选的，所述专用随机接入资源与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系；其中，所述处理单元720具体用于：根据所述专用随机接入资源与配置有所述PUCCH资源的上行载波的对应关系，确定所述专用随机接入资源对应的至少一个上行载波。
可选的，所述资源配置信息还包括PUCCH资源，所述处理单元720具体用于：
将所述至少两个上行载波中配置有PUCCH资源的上行载波中的一个确定为所述目标载波。
可选的，所述资源配置信息还包括通用随机接入资源，如果所述终端设备使用所述专用随机接入资源在所述目标载波上进行基于非竞争的随机接入失败，所述终端设备使用所述通用随机接入资源在所述目标载波或不同于所述目标载波的另一个上行载波上进行基于竞争的随机接入。
可选的，所述资源配置信息包括PUCCH资源，所述处理单元720具体用于：
将所述至少一个上行载波中配置有PUCCH资源的上行载波中的一个确定为所述目标载波。
可选的，所述处理单元720具体用于：当配置有PUCCH资源的上行载波的数量为一个时，所述终端设备将所述配置有PUCCH资源的上行载波确定为所述目标载波；
当配置有PUCCH资源的上行载波数量为至少两个，所述终端设备根据对所述小区的测量结果，在确定所述目标载波。
可选的，所述资源配置信息包括通用随机接入资源，所述处理单元720具体用于：
所述终端设备根据对所述小区的测量结果，在所述至少一个上行载波中确定所述目标载波。
可选的，所述测量结果包括下行参考信号的测量结果，其中，所述处理单元720具体用于：
如果所述下行参考信号的测量结果大于或等于阈值，所述终端设备将所述第一上行载波确定为所述目标载波；
如果所述下行参考信号的测量结果小于所述阈值，所述终端设备将所述第二上行载波确定为所述目标载波。
可选的，如果所述终端设备在所述目标载波上采用功率升序的方式发起了X次随机接入之后，或，如果所述终端设备在所述目标载波上发起随机接入失败Y次之后，或在所述目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
应注意，本发明实施例中，接收单元710可以由收发器实现，处理单元720可以由处理器实现。如图8所示，终端设备800可以包括处理器810、存储器820和收发器830。其中，存储器820可以用于存储处理器810执行的代码等，处理器810可以用于对数据或程序进行处理。
在实现过程中，上述方法的各步骤可以通过处理器810中的硬件的集成逻辑电路或者软件形式的指令完成。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器820，处理器810读取存储器820中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
图7所示的终端设备700或图8所示的终端设备800能够实现前述方法实施例对应的各个过程，具体的，该终端设备700或终端设备800可以参见上文中的描述，为避免重复，这里不再赘述。
图9示出了本申请实施例提供的一种网络设备900的示意性框图。网络设备900可以包括处理单元910和发送单元920。
处理单元910，用于确定第一指示信息，所述第一指示信息用于指示至少一个上行载波的资源配置信息，所述至少一个上行载波包括第一上行载波和/或至少一个第二上行载波，其中，所述第一上行载波和所述至少一个第二上行载波为所述网络设备900的一个小区中的不同的上行载波，且所述第一上行载波和所述至少一个第二上行载波对应于所述小区中的一个下行载波。
例如，所述第一指示信息用于指示第一上行载波或者第二上行载波的资源配置信息，其中，所述第一上行载波和所述第二上行载波为所述装置的一个小区中不同的上行载波，且所述第一上行载波和所述第二上行载波对应于所述小区中的一个下行载波。
发送单元920，用于发送所述第一指示信息，使得终端设备在所述至少一个上行载波中确定一个上行载波作为目标载波进行随机接入。
可选的，所述第一指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息，或者， 所述用于进行同步的重配置消息包括所述第一上行载波的配置信息或所述第二上行载波的配置信息。
可选的，所述第一上行载波的配置信息包括所述第一上行载波的物理上行共享信道(PUSCH)配置、物理上行链路控制信道(PUCCH)配置、探测参考信号(SRS)配置、上行功率控制配置的至少一种；所述第二上行载波的配置信息包括所述第二上行载波的物理上行共享信道(PUSCH)配置、物理上行链路控制信道(PUCCH)配置、探测参考信号(SRS)配置、上行功率控制配置的至少一种。
可选的，所述用于进行同步的重配置消息还包括阈值，所述阈值用于所述终端设备根据下行参考信号的测量结果确定所述目标载波。
可选的，所述第一指示信息用于指示所述目标载波的资源配置信息；
所述网络设备900还包括接收单元，用于接收所述终端设备对所述小区的测量结果；
所述处理单元910具体用于根据所述接收单元接收的所述测量结果，在所述至少一个上行载波中确定所述目标载波。
可选的，所述测量结果包括下行参考信号的测量结果，其中，所述处理单元910具体用于：
如果所述下行参考信号的测量结果大于或等于阈值，将所述至少一个上行载波中的所述第一上行载波确定为所述目标载波；
如果所述下行参考信号的测量结果小于所述阈值，将所述至少一个上行载波中的所述第二上行载波确定为所述目标载波。
可选的，所述资源配置信息包括专用随机接入资源和/或PUCCH资源；
其中，所述第一指示信息中包括所述专用随机接入资源对应的载波索引，所述专用随机接入资源对应的载波索引用于指示所述专用随机接入资源对应的至少一个上行载波；或
所述专用随机接入资源与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系，所述对应关系用于指示所述专用随机接入资源对应的至少一个上行载波。
可选的，所述第一指示信息中还包括通用随机接入资源。
可选的，所述发送单元920还用于向所述终端设备发送第二指示信息，所述第二指示信息用于指示当所述终端设备在所述目标载波上采用功率升序的方式发起了X次随机接入之后，或，当所述终端设备在所述目标载波上发起随机接入失败Y次之后，或当所述终端设备在所述目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
应注意，本发明实施例中，处理单元910可以由处理器实现，发送单元920可以由收发器实现。如图10所示，网络设备1000可以包括处理器1010、存储器1020和收发器1030。其中，存储器1020可以用于存储处理器1010执行的代码等，处理器1010可以用于对数据或程序进行处理。
在实现过程中，上述方法的各步骤可以通过处理器1010中的硬件的集成逻辑电路或者软件形式的指令完成。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1020，处理器1010读取存储器1020中的 信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
图9所示的网络设备900或图10所示的网络设备1000能够实现前述方法实施例对应的各个过程，具体的，该网络设备900或网络设备1000可以参见上文中的描述，为避免重复，这里不再赘述。
本申请实施例还提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行上述方法实施例中终端设备或网络设备对应的方法的指令。
本申请实施例还提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被通信设备(例如，终端设备或网络设备)的通信单元、处理单元或收发器、处理器运行时，使得通信设备执行上述方法实施例中终端设备或网络设备对应的方法。
本申请实施例还提供了一种通信芯片，其中存储有指令，当其在通信装置上运行时，使得所述通信芯片执行上述方法实施例中终端设备或网络设备对应的方法。
本申请实施例还提供了一种通信系统，该通信系统包括上述终端设备和网络设备。并且，本申请实施例中的该通信系统可以处于切换场景或双连接场景，其中，当处于切换场景时，该通信系统中包括上文中所述的终端设备、源网络设备和目标网络设备，当处于双连接场景时，该通信系统包括上文中所述的终端设备、主基站和辅基站。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而 前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    终端设备接收网络设备发送的指示信息，所述指示信息用于指示第一上行载波或者第二上行载波的资源配置信息，其中，所述第一上行载波和所述第二上行载波为所述网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述第二上行载波对应于所述小区中的一个下行载波；
    所述终端设备根据所述指示信息确定目标载波；
    所述终端设备以所述目标载波发起随机接入。
  2. 根据权利要求1所述的方法，其特征在于，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息，当所述资源配置信息没有包含专用随机接入资源时，所述终端设备确定目标载波包括：
    如果所述终端设备确定下行参考信号的测量结果大于或等于阈值，确定所述第一上行载波为所述目标载波；或
    如果所述终端设备确定下行参考信号的测量结果小于阈值，确定所述第二上行载波为所述目标载波。
  3. 根据权利要求2所述的方法，其特征在于，所述第一上行载波的配置信息和所述第二上行载波的配置信息包括各自的物理上行共享信道PUSCH配置、物理上行链路控制信道PUCCH配置、探测参考信号SRS配置、上行功率控制配置的至少一种。
  4. 根据权利要求2或3所述的方法，其特征在于，所述用于进行同步的重配置消息还包括所述阈值。
  5. 根据权利要求1所述的方法，其特征在于，所述资源配置信息包括专用随机接入资源，所述终端设备根据所述指示信息确定所述目标载波包括：
    所述终端设备根据所述指示信息，确定所述专用随机接入资源对应的所述第一上行载波或所述第二上行载波为所述目标载波。
  6. 根据权利要求5所述的方法，其特征在于，所述指示信息中包括所述专用随机接入资源对应的载波索引；
    其中，所述终端设备根据所述指示信息确定目标载波包括：
    所述终端设备将所述专用随机接入资源对应的载波索引指示的载波确定为所述目标载波。
  7. 根据权利要求5或6所述的方法，其特征在于，所述资源配置信息还包括通用随机接入资源，所述方法还包括：
    如果所述终端设备使用所述专用随机接入资源在所述目标载波上进行基于非竞争的随机接入失败，所述终端设备使用所述通用随机接入资源在所述目标载波或不同于所述目标载波的另一个上行载波上进行基于竞争的随机接入。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，所述方法还包括：
    如果所述终端设备在所述目标载波上采用功率升序的方式发起了X次随机接入之后， 或，如果所述终端设备在所述目标载波上发起随机接入失败Y次之后，或在所述目标载波上发送随机接入前导序列Z次之后，所述终端设备在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
  9. 一种通信方法，其特征在于，包括：
    网络设备确定指示信息，所述指示信息用于指示第一上行载波或者第二上行载波的资源配置信息，其中，所述第一上行载波和所述第二上行载波为所述网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述第二上行载波对应于所述小区中的一个下行载波；
    所述网络设备向终端设备发送所述指示信息，使得所述终端设备根据所述指示信息确定目标载波。
  10. 根据权利要求9所述的方法，其特征在于，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息。
  11. 根据权利要求10所述的方法，其特征在于，所述第一上行载波的配置信息和所述第二上行载波的配置信息包括各自的物理上行共享信道PUSCH配置、物理上行链路控制信道PUCCH配置、探测参考信号SRS配置、上行功率控制配置的至少一种。
  12. 根据权利要求10或11所述的方法，其特征在于，所述用于进行同步的重配置消息还包括阈值，所述阈值用于所述终端设备根据下行参考信号的测量结果确定所述目标载波。
  13. 根据权利要求9所述的方法，其特征在于，所述指示信息用于指示所述目标载波的资源配置信息；
    其中，所述网络设备确定指示信息，包括：
    所述网络设备接收所述终端设备对所述小区的测量结果；
    所述网络设备根据所述测量结果，确定所述目标载波。
  14. 根据权利要求13所述的方法，其特征在于，所述测量结果包括下行参考信号的测量结果，其中，所述网络设备根据所述测量结果，确定所述目标载波，包括：
    如果所述下行参考信号的测量结果大于或等于阈值，所述网络设备将所述第一上行载波确定为所述目标载波；
    如果所述下行参考信号的测量结果小于所述阈值，所述网络设备将所述第二上行载波确定为所述目标载波。
  15. 根据权利要求9-14任一项所述的方法，其特征在于，所述资源配置信息包括专用随机接入资源和/或PUCCH资源；
    其中，所述指示信息中包括所述专用随机接入资源对应的载波索引，所述专用随机接入资源对应的载波索引用于指示所述目标载波；或
    所述专用随机接入资源与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系，所述对应关系用于指示所述目标载波。
  16. 一种通信装置，其特征在于，包括：
    接收单元，用于接收网络设备发送的指示信息，所述指示信息用于指示第一上行载波或者第二上行载波的资源配置信息，其中，所述第一上行载波和所述第二上行载波为所述 网络设备的一个小区中不同的上行载波，且所述第一上行载波和所述第二上行载波对应于所述小区中的一个下行载波；
    处理单元，用于根据所述指示信息确定目标载波；
    所述处理单元还用于以所述目标载波发起随机接入。
  17. 根据权利要求16所述的装置，其特征在于，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息，当所述资源配置信息没有包含专用随机接入资源时，所述处理单元具体用于：
    如果确定下行参考信号的测量结果大于或等于阈值，确定所述第一上行载波为所述目标载波；或
    如果确定下行参考信号的测量结果小于阈值，确定所述第二上行载波为所述目标载波。
  18. 根据权利要求17所述的装置，其特征在于，所述第一上行载波的配置信息和所述第二上行载波的配置信息包括各自的物理上行共享信道PUSCH配置、物理上行链路控制信道PUCCH配置、探测参考信号SRS配置、上行功率控制配置的至少一种。
  19. 根据权利要求17或18所述的装置，其特征在于，所述用于进行同步的重配置消息还包括所述阈值。
  20. 根据权利要求16所述的装置，其特征在于，所述资源配置信息包括专用随机接入资源，所述处理单元具体用于：
    根据所述指示信息，确定所述专用随机接入资源对应的所述第一上行载波或所述第二上行载波为所述目标载波。
  21. 根据权利要求20所述的装置，其特征在于，所述指示信息中包括所述专用随机接入资源对应的载波索引；
    其中，所述处理单元具体用于：
    将所述专用随机接入资源对应的载波索引指示的载波确定为所述专用随机接入资源对应的至少一个上行载波。
  22. 根据权利要求20或21所述的装置，其特征在于，所述资源配置信息还包括通用随机接入资源，所述处理单元还用于：
    如果使用所述专用随机接入资源在所述目标载波上进行基于非竞争的随机接入失败，使用所述通用随机接入资源在所述目标载波或不同于所述目标载波的另一个上行载波上进行基于竞争的随机接入。
  23. 根据权利要求16-22任一项所述的装置，其特征在于，所述处理单元还用于：
    如果在所述目标载波上采用功率升序的方式发起了X次随机接入之后，或，如果在所述目标载波上发起随机接入失败Y次之后，或在所述目标载波上发送随机接入前导序列Z次之后，在不同于所述目标载波的另一个上行载波上进行随机接入，其中，X，Y，Z分别为大于1的正整数。
  24. 一种通信装置，其特征在于，包括：
    处理单元，用于确定指示信息，所述指示信息用于指示第一上行载波或者第二上行载波的资源配置信息，其中，所述第一上行载波和所述第二上行载波为所述装置的一个小区 中不同的上行载波，且所述第一上行载波和所述第二上行载波对应于所述小区中的一个下行载波；
    发送单元，用于向终端设备发送所述指示信息，使得所述终端设备根据所述指示信息确定目标载波。
  25. 根据权利要求24所述的装置，其特征在于，所述指示信息通过用于进行同步的重配置消息携带，所述用于进行同步的重配置消息包括所述第一上行载波的配置信息和所述第二上行载波的配置信息。
  26. 根据权利要求25所述的装置，其特征在于，所述第一上行载波的配置信息和所述第二上行载波的配置信息包括各自的物理上行共享信道PUSCH配置、物理上行链路控制信道PUCCH配置、探测参考信号SRS配置、上行功率控制配置的至少一种。
  27. 根据权利要求25或26所述的装置，其特征在于，所述用于进行同步的重配置消息还包括阈值，所述阈值用于所述终端设备根据下行参考信号的测量结果确定所述目标载波。
  28. 根据权利要求24所述的装置，其特征在于，所述指示信息用于指示所述目标载波的资源配置信息；
    其中，所述处理单元具体用于：
    接收所述终端设备对所述小区的测量结果；
    根据所述测量结果，在所述至少一个上行载波中确定所述目标载波。
  29. 根据权利要求28所述的装置，其特征在于，所述测量结果包括下行参考信号的测量结果，其中，所述处理单元具体用于：
    如果所述下行参考信号的测量结果大于或等于阈值，将所述至少一个上行载波中的所述第一上行载波确定为所述目标载波；
    如果所述下行参考信号的测量结果小于所述阈值，将所述至少一个上行载波中的所述第二上行载波确定为所述目标载波。
  30. 根据权利要求24-29任一项所述的装置，其特征在于，所述资源配置信息包括专用随机接入资源和/或PUCCH资源；
    其中，所述指示信息中包括所述专用随机接入资源对应的载波索引，所述专用随机接入资源对应的载波索引用于指示所述专用随机接入资源对应的至少一个上行载波；或
    所述专用随机接入资源与配置有物理上行控制信道PUCCH资源的上行载波具有对应关系，所述对应关系用于指示所述专用随机接入资源对应的至少一个上行载波。
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