WO2019019982A1 - 一种配置随机接入的方法、网络设备及终端设备 - Google Patents

一种配置随机接入的方法、网络设备及终端设备 Download PDF

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Publication number
WO2019019982A1
WO2019019982A1 PCT/CN2018/096731 CN2018096731W WO2019019982A1 WO 2019019982 A1 WO2019019982 A1 WO 2019019982A1 CN 2018096731 W CN2018096731 W CN 2018096731W WO 2019019982 A1 WO2019019982 A1 WO 2019019982A1
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Prior art keywords
random access
control information
time
downlink control
terminal device
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English (en)
French (fr)
Inventor
庞继勇
朱俊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP18839504.0A priority Critical patent/EP3654714A4/en
Publication of WO2019019982A1 publication Critical patent/WO2019019982A1/zh
Priority to US16/752,202 priority patent/US20200163128A1/en
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    • 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
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • 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
    • H04W72/20—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
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a random access technology applied to an unlicensed frequency band.
  • the random access procedure is a basic process in wireless communication, and its main purpose is to enable the UE to obtain uplink synchronization for uplink transmission.
  • the user For a contention random access procedure, the user needs to select a time-frequency resource for transmitting a random access preamble, where the available time-frequency resource is usually an evolved NodeB (eNB). Configured in a broadcast message in a fixed or semi-static manner.
  • eNB evolved NodeB
  • the time-frequency resources used by the user to transmit the random access preamble and the random access preamble may be specified by the eNB.
  • 5G fifth-generation mobile communication
  • new wireless transmission technology and new architecture are introduced to further explore new spectrum resources, so that 5G systems will be in resource utilization rate, system throughput rate and The spectrum resources are completely beyond the LTE system.
  • how to use the unlicensed frequency band random access resources more efficiently in the 5G system is an urgent problem to be solved.
  • the embodiment of the present application describes a method for configuring random access in an unlicensed frequency band, which aims to improve the communication efficiency of the communication system by rationally configuring the channel occupation time and the time domain resources of the terminal device to transmit the random preamble.
  • the present application provides a method for configuring random access, which is applied to an unlicensed frequency band.
  • the method for configuring the random access includes: the network device performs channel interception and contends to the channel occupation time; if the time-frequency resource for transmitting the random access preamble of the terminal device is configured in the channel occupation time, the network device sends the terminal to the terminal The device sends downlink control information, where the downlink control information is used to indicate that the configuration information of the random access preamble is transmitted on the time-frequency resource.
  • channel snooping is required before the network device transmits data or signaling to determine if the channel is idle.
  • the downlink control information is used to indicate that the terminal device prohibits transmission of the random access preamble on all or part of the time-frequency resources.
  • the sending, by the network device, the downlink control information to the terminal device includes: sending, by the network device, downlink control information to the terminal device at a first time, where the downlink control information is used to indicate the terminal The device prohibits transmission of the random access preamble during the remaining channel occupation time after the first time point.
  • the transmission of the time domain resource is dynamically adjusted by prohibiting the transmission of the random access preamble in all or part of the preset time domain resources in the channel occupation time. Transmission is carried out to improve the efficiency of communication.
  • the present application further provides another method for configuring random access, which is applied to an unlicensed frequency band.
  • the method for configuring the random access includes: receiving, by the terminal device, downlink control information that is sent by the network device, where the downlink control information is sent by the network device after contending for the channel occupation time, and is configured to be useful during the channel occupation time.
  • the transmission terminal device randomly accesses a preamble of the time-frequency resource, where the downlink control information is used to indicate that the configuration information of the random access preamble is transmitted on the time-frequency resource; and the terminal device performs the randomization according to the downlink control information. Access the preamble transmission.
  • the downlink control information is used to configure the terminal device to perform or not perform LBT before transmitting a random access preamble .
  • the downlink control information is used to indicate that the terminal device performs a type of LBT before transmitting a random access preamble, and the LBT type includes a second type LBT (cat. 2LBT).
  • the LBT type includes a second type LBT (cat. 2LBT).
  • cat.2LBT adopts a relatively short clear channel assessment (CCA) duration, which can save LBT time.
  • CCA clear channel assessment
  • the application provides a network device, configured to perform the method for configuring random access provided by the foregoing first aspect.
  • the network device includes: a processor, configured to perform channel interception and compete for channel occupation time; and a transceiver, configured to send downlink control information to one or more terminal devices, where the one or more terminals are configured to be scheduled And transmitting the random preamble on the time domain resource, where the downlink control information is used to indicate that the one or more terminal devices transmit in the channel occupation time when the predetermined time domain resource is in the channel occupation time. Random access preamble configuration information.
  • the present application provides a computer readable storage medium having instructions stored therein that, when run on a computer, execute a method as described in the first aspect above.
  • the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.
  • the application provides a terminal device, configured to perform the method for configuring random access provided by the foregoing second aspect.
  • the terminal device includes a processor and a transceiver: the transceiver is configured to receive downlink control information sent by the network device, where the downlink control information is sent by the network device after competing for a channel occupation time, where Configuring a time-frequency resource for transmitting a random access preamble of the terminal device, the downlink control information is used to indicate configuration information for transmitting a random access preamble on the time-frequency resource, and the processor is configured to: And controlling, according to the downlink control information, the transmission of the random access preamble by the transceiver.
  • the present application provides a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform the method provided by the second aspect above.
  • the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the second aspect described above.
  • FIG. 1 is a schematic diagram of a possible application scenario in the embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a possible resource indication method in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a channel occupation duration in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a channel occupation duration in another embodiment of the present application.
  • FIG. 5 is a schematic diagram of a channel occupation duration in another embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the network architecture may be a network architecture of a wireless communication system, and may include a network device and a terminal device.
  • the network device and the terminal device are connected by using a wireless communication technology.
  • the number and the configuration of the terminal device and the network device shown in FIG. 1 do not constitute a limitation on the embodiments of the present application.
  • one network device can be connected to one or more multiple terminal devices.
  • the network device can also be connected to a core network device, which is not shown in FIG.
  • the wireless communication system mentioned in the embodiments of the present application includes, but is not limited to, a narrow band-internet of things (NB-IoT), and a global system for mobile communications (GSM).
  • GSM global system for mobile communications
  • EDGE Enhanced data rate for GSM evolution
  • WCDMA wideband code division multiple access
  • CDMA2000 code division multiple access
  • TD-SCDMA Time division-synchronization code division multiple access
  • LTE long term evolution
  • future mobile communication system includes, but is not limited to, a narrow band-internet of things (NB-IoT), and a global system for mobile communications (GSM).
  • EDGE Enhanced data rate for GSM evolution
  • WCDMA wideband code division multiple access
  • CDMA2000 code division multiple access
  • TD-SCDMA Time division-synchronization code division multiple access
  • LTE long term evolution
  • future mobile communication system future mobile communication system.
  • the foregoing network device is a device deployed in a radio access network to provide a wireless communication function for the terminal device.
  • the network device may include, but is not limited to, a base station (BS), a network controller, a transmission and reception point (TRP), or a mobile switching center, etc., exemplarily, directly communicating with the terminal device through a wireless channel.
  • the device is usually a base station.
  • the base station may include various forms of macro base stations, micro base stations, relay stations, access points, or Radio Radio Units (RRUs).
  • RRUs Radio Radio Units
  • the wireless communication with the terminal device may also be another network device having a wireless communication function, which is not limited in this application.
  • the names of devices with base station functions may be different in different systems, for example, in an LTE network, called an evolved NodeB (eNB or eNodeB), in the third generation (the In the 3rd generation, 3G) network, it is called Node B (Node B), etc.
  • eNB evolved NodeB
  • Node B Node B
  • 5G base station 5G base station
  • a terminal device also called a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • a handheld device with wireless connectivity an in-vehicle device
  • a wearable device a computing device, or other processing device linked to a wireless modem.
  • terminal devices are: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, enhancements.
  • MIDs mobile internet devices
  • VR virtual reality
  • Augmented reality (AR) equipment wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, smart grid A wireless terminal in a wireless terminal, a wireless terminal in a transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, or the like.
  • AR Augmented reality
  • the wireless communication system involved in various embodiments of the present application can support multi-carrier (waveform signals of different frequencies) operations.
  • Multi-carrier transmitters can simultaneously transmit modulated signals on multiple carriers, for example, each communication connection can carry multi-carrier signals modulated with different wireless technologies.
  • Each modulated signal can be transmitted on different carriers, and can also carry control information (such as reference signals, control channels, etc.), overhead information, data, and the like.
  • the technical solution provided by the present application can be applied to an unlicensed frequency band, especially to a random access procedure on an unlicensed frequency band.
  • LBT Listen Before Talk
  • CCA can be determined based on the channel energy threshold. If the channel is idle, it can be sent; otherwise, it cannot be sent.
  • the LBT type will be different, and the listening duration used will be different.
  • LBT types exist at least, one is a type that needs to perform random backoff and relatively long listening time, and can be called a fourth type of LBT (Cat4LBT); the other is a relatively short listening time that needs to be performed.
  • Cat4LBT the fourth type of LBT
  • Type which can be called the second type of LBT (Cat2LBT). It should be noted that the division of the LBT type is not limited to the embodiment of the present application.
  • Random access is an important process in wireless communication, and its purpose is mainly to enable the terminal device to obtain uplink synchronization for uplink transmission.
  • the main function of the random access preamble is to inform the base station that there is a random access request, so that the base station can estimate the transmission delay between the base station and the terminal device, so that the base station can calibrate the uplink time and notify the terminal device of the calibration information.
  • the base station For contention-based random access, the base station notifies the broadcast access information of the available random access preamble in the broadcast information (there may be multiple preambles conforming to a certain preamble format) and is used to transmit the random access preamble.
  • a collection of time-frequency resources When the terminal device initiates random access, it randomly selects a preamble that conforms to the random access preamble format, and randomly selects a time-frequency resource from the available time-frequency resource set to transmit the selected random access preamble.
  • the base station specifies the time-frequency resource and preamble for the terminal device for random access.
  • the base station may specify random access for the terminal device by using radio resource control (RRC) signaling and/or downlink control information (DCI) in a physical downlink control channel (PDCCH).
  • RRC radio resource control
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • FIG. 2 is a schematic flowchart of a resource indication method according to an embodiment of the present application, which is applied to interaction between a network device and one or more terminal devices.
  • the one or more terminals are allowed to transmit a random preamble on a predetermined time domain resource, ie, the one or more terminals may transmit a random preamble at a predetermined time domain resource.
  • the predetermined time resource may be periodic or non-periodic.
  • Step 201 The network device performs channel interception and competes for channel occupy time (COT).
  • COT channel occupy time
  • the network device When the channel listening result is idle, the network device will contend for the channel occupation time for data or signaling transmission.
  • the unit of the channel occupation time may be a subframe, and each subframe may have a length of 1 ms.
  • the unit of the channel occupation time may be a slot, where each time slot includes 7 or 14 orthogonal frequency division multiplexing (OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • the unit of the channel occupation time may be a mini-slot, wherein each microslot includes OFDM symbols smaller than the number of OFDM symbols included in one slot.
  • time units are merely examples, and those skilled in the art may use other time units to describe the channel occupation time.
  • a time slot is used as a time unit of channel occupation time as an example.
  • the time unit used for channel occupation time is not limited as a method for configuring random access in the present application.
  • the network device contends to the channel at time T0, the start time of the channel occupation is T0, and the end time is T2.
  • the channel occupation time is 6 time slots, including 4 downlink (DL) transmission time slots: time slot 1-DL, time slot 2-DL, time slot 3-DL, time slot 4-DL; 2 uplink (UL) transmission slots: slot 5-UL, slot 6-UL.
  • DL downlink
  • UL uplink
  • the ratio of the time slot of the uplink transmission to the time slot of the downlink transmission may be different within the channel occupancy time.
  • Step 202 If the time-frequency resource for transmitting the random access preamble of the terminal device is configured, the network device sends downlink control information to the terminal device, where the downlink control information is used to indicate that the random transmission is performed on the time-frequency resource. Access the configuration information of the preamble.
  • a terminal device is taken as an example for description. It can be understood that the implementation of the multiple terminal devices can refer to the one terminal device, and details are not described herein again.
  • the downlink control information (in this case, the downlink control information may be referred to as: random access indication information) is used to indicate that the terminal device prohibits transmission of the random access preamble on the time-frequency resource in the channel occupation time. That is, the downlink control information is used to indicate that the terminal device is prohibited from transmitting the random access preamble by using a preset time-frequency resource in the current channel occupation time. Specifically, the downlink control information may indicate that multiple time slots in the current channel occupation time are prohibited from transmitting the random access preamble, or the downlink control information may indicate that a certain time slot in the current channel occupation time prohibits transmission of the random access preamble.
  • the network device can continue to transmit on the time domain resource that transmits the random preamble, and transmit the random preamble in the time domain resource other than the prohibited time domain resource. Dynamically adjust the allocation of time domain resources and flexibly transmit, thereby improving communication efficiency.
  • the time domain resource for the terminal device to transmit the random preamble is preset by the time slot 5-UL, and the network device sends the downlink control information at the time T1 to indicate that the terminal device is prohibited from being in the time slot 5-UL.
  • the random access preamble is transmitted.
  • the time domain resources for transmitting the random access preamble are both the time slot 5-UL and the time slot 6-UL.
  • the downlink control information may indicate that the time slot 5-UL is prohibited, or the time slot 6-
  • the UL transmits a random access preamble, or may also indicate that both the slot 5-UL and the slot 6-UL transmission random access preamble are disabled.
  • the network device sends the downlink control information to the one or more terminal devices at the first time point T1, where the downlink control information is used to indicate how the terminal device transmits the random access preamble in the remaining channel occupation time after the first time point, that is, A configuration indicating the transmission of the random access preamble within the time window of T1 to T2.
  • the time window of T1 to T2 can be represented by an absolute time offset or a relative time offset.
  • the downlink control information may also indicate by default the first time domain resource for transmitting the random access preamble after the time T1 (that is, the time when the downlink control information is sent).
  • the downlink control information (in this case, the downlink control information or the LBT indication information) is used to configure the terminal device to perform or not execute the LBT before transmitting the random access preamble.
  • the terminal device when operating in an unlicensed band, the terminal device needs to perform an LBT to determine whether the channel is idle before transmitting the random access preamble, and can transmit the random access preamble on the predetermined time resource when the channel is confirmed to be idle.
  • the network device can preempt the channel occupation time, the network device can receive, and then the terminal device can be instructed not to perform the LBT.
  • the preset time domain resource is reached, the random preamble is sent to the network device, thereby saving the network device.
  • Access time For example, the network device may carry the identifier of one or more terminal devices in an ⁇ manner, or may implicitly refer to carrying the identifier of one or more terminals to indicate that the terminal device does not perform LBT.
  • the downlink control information may be used to indicate that the one or more terminal devices perform the type of the LBT before transmitting the random access preamble.
  • the type of the LBT includes, but is not limited to, listening with a relatively short clear channel assessment (CCA) duration, such as a second type LBT (cat 2LBT), so that a relatively short time can be used when LBT is required. The length of time increases the efficiency of random access.
  • CCA clear channel assessment
  • the downlink control information may indicate the random access information or the LBT indication information by 2 bits.
  • the time domain resource of the random access preamble preset in the current channel occupation time is not available, and "00" indicates that the random access preamble transmission in the current channel occupation time is preceded by the cat 2LBT, and "01" indicates the current channel.
  • the LBT is not performed before the random access preamble transmission in the occupation time, and "11” is a reservation indication. It is to be understood that the above indications of “10”, “00”, “01”, and “11” are merely examples and are not intended to be limiting. In different embodiments, the contents indicated by the above “10”, “00”, “01”, and “11” may be exchanged.
  • Step 203 The terminal device receives the downlink control information, and performs the transmission of the random access preamble according to the downlink control information.
  • the terminal device can identify its own downlink control information through a descrambling operation.
  • the received signaling may be descrambled according to its own radio network temporary identifier (RNTI) to obtain its own downlink control information;
  • RNTI radio network temporary identifier
  • the plurality of terminal devices may perform descrambling on the received signaling according to the common RNTI to obtain its own downlink control information.
  • a plurality of terminal devices may be divided by a cell or divided by a group, and there is no limitation thereto.
  • the terminal device when the downlink control information indicates that the preset time domain resource in the channel occupation time prohibits transmission of the random access preamble, the terminal device does not transmit the random access preamble in the corresponding time domain resource, but is used to transmit the random access preamble
  • the time domain resource set of the access preamble randomly selects other time domain resources for random access preamble transmission.
  • the terminal device when the downlink control information indicates that the terminal device does not perform the LBT before the random access preamble is transmitted in the channel occupation time, when the preset time domain resource is reached, the terminal device sends the random access preamble to the network device, without Waiting for LBT.
  • the terminal device adopts the indicated LBT type, thereby saving the LBT. time.
  • the allocation of time domain resources can be dynamically adjusted, and the channel occupation time can be reasonably utilized, thereby improving the efficiency of the communication system.
  • the foregoing downlink control information may further include one or more of the following parameters to dynamically notify the terminal device of the time-frequency resources of the random access preamble:
  • Time domain start time used to indicate the starting point of the time-frequency resource in the time domain.
  • the time domain start time is aligned with the boundary of the OFDM symbol, the boundary of the minislot, the boundary of the slot, or the boundary of the subframe.
  • the terminal device can acquire the time domain resource for transmitting the preamble when the time domain start time is indicated.
  • the time domain start time may be implemented in one or more of the following ways:
  • Absolute Offset The start time or end time on the time domain resource occupied by the following row control information is the reference time, indicating the time offset between the reference time and the start time of the time-frequency resource.
  • the 10-bit delay notification control information may indicate a time offset range of [0 to 1023] us;
  • the start symbol or the end symbol on the time domain resource occupied by the following row control information is a reference symbol, indicating the reference symbol and the time-frequency resource of the random access allocated to the terminal device
  • the offset between the start symbols (in symbols). For example, it is assumed that a maximum of 64 symbols are allowed to be spaced between the reference symbol and the time domain start time of the time-frequency resource of the random access allocated to the terminal device. If the indication granularity is 1 symbol, an indication overhead of 6 bits is required; if the indication granularity is 2 symbols, an indication overhead of 5 bits is required.
  • the network device may also indicate an indication granularity of the offset in the downlink control information.
  • the offset is indicated according to the configuration of the frame structure.
  • the configuration of the foregoing frame structure taking the subframe-slot-microslot-symbol grading as an example, indicates the offset of the downlink control information and the time-frequency resource of the random access to be notified in the time dimension.
  • 11100100 means that the offset is 3ms + 2 slots + 1 mini-slot, 00111001 This means that the offset is 3 slots + 2 micro slots + 1 OFDM symbol.
  • the length of one OFDM symbol in the time domain may be variable or non-variable. Taking the length of the OFDM symbol in the time domain as an example, the length of the OFDM symbol varies with the subcarrier spacing. For an OFDM symbol with a regular cyclic prefix (CP), the length of an OFDM symbol with a subcarrier spacing of 15 kHz is equal to the sum of the lengths of two OFDM symbols with a subcarrier spacing of 30 kHz, which is equal to 4 subcarrier spacings of 60 kHz. The sum of the lengths of the OFDM symbols. Therefore, when the OFDM symbol lengths are different, the number of OFDM symbols included in one subframe, slot or minislot is different. In view of this, for the second mode and the third mode, the premise is that the terminal device can learn the parameter configuration corresponding to the OFDM symbol by using the following methods:
  • a method for displaying an indication is that the network device simultaneously indicates a parameter configuration corresponding to the OFDM symbol in downlink control information indicating the foregoing symbol-based relative offset, for example, length, subcarrier spacing, and loop At least one of a cyclic prefix (CP) type or length.
  • another method of displaying the indication is that the network device indicates, in other control signalings other than the downlink control information indicating the foregoing symbol-based relative offset, a parameter configuration corresponding to acquiring the OFDM symbol, for example, length, At least one of a subcarrier spacing, a CP type, or a length.
  • Implicit indication An implicit indication method is that the parameter configuration corresponding to the default OFDM symbol is the same as the parameter configuration used for transmitting the downlink control information; or another implicit indication method is the default OFDM symbol.
  • the corresponding subcarrier spacing is the same as the maximum frequency domain subcarrier spacing allowed for downlink transmission of the network device; or another implicit indication method is that the subcarrier spacing corresponding to the default OFDM symbol is allowed on the time-frequency resource.
  • the subcarrier spacing of the random access preamble corresponding to the random access preamble format is the same.
  • the frequency domain start position is used to indicate the position of the time-frequency resource in the frequency domain.
  • the frequency domain location is measured in units of the frequency domain width of the resource block (RB) (eg, 12 subcarriers).
  • RB resource block
  • the format of the random access preamble determines the RB width in the frequency domain (that is, the number of occupied RBs and consecutively placed between the RBs).
  • the network device provides the frequency domain starting position, and the terminal device can obtain the used All the frequency domain resources of the preamble are transmitted.
  • the frequency domain resources occupied by the uplink data transmission on the unlicensed frequency band are allocated in units of 10 RBs of resource interlace.
  • the starting RB position indicated by the network device is the position of the starting RB of the resource interleaving occupied by the transmission preamble, that is, the index of the resource interleaving.
  • the resource allocation can be flexibly performed to adapt to the first-listening transmission mechanism in the unlicensed frequency band scenario.
  • a structure of a network device includes a processor (or controller) and a transceiver.
  • a communication unit may also be included in the structure of the network device. The communication unit is used to support communication with other network side devices, such as communication with core network nodes.
  • the structure of the network device may further include a memory coupled to the processor for storing necessary program instructions and data of the network device.
  • FIG. 6 illustrates a possible simplified schematic diagram of a network device involved in the above embodiment.
  • the structure of the network device involved in the present application includes a transceiver 601, a processor 602, a memory 603, and a communication unit 604.
  • the transceiver 601, the processor 602, the memory 603, and the communication unit 604 pass Bus connection.
  • transceiver 601 On the downlink, data or signaling to be transmitted (including the downlink control information described above) is adjusted by the transceiver 601 to output samples and generate a downlink signal, which is transmitted via an antenna to the above-described embodiment. Terminal Equipment.
  • the antenna receives the uplink signal (including the random access preamble described above) transmitted by the terminal device in the above embodiment, and the transceiver 602 adjusts the signal received from the antenna and provides input samples.
  • the service data and the signaling message are processed, for example, data to be transmitted, SC-FDMA symbol generation, and the like. These units are processed according to the radio access technologies employed by the radio access network (e.g., access technologies for LTE, 5G, and other evolved systems).
  • transceiver 602 is integrated by a transmitter and a receiver. In other embodiments, the transmitter and receiver may also be independent of one another.
  • the processor 602 is further configured to perform control and management on the action of the network device, and is used to perform processing performed by the network device in the foregoing embodiment, for example, to control the network device to process downlink control information and/or perform the application. Other processes described by the technology.
  • the processor 602 is configured to support the network device to perform the processing procedure involving the network device in FIGS. 2-6. For example, processor 602 performs channel listening and competes for channel occupancy time.
  • processor 602 performs channel sensing based on signals received by transceiver 602 from the antenna and controls the transceiver to transmit signals from the antenna to occupy the channel.
  • the processor 602 may include one or more processors, for example, including one or more central processing units (CPUs), which may be integrated in the chip, or may be the chip itself. .
  • CPUs central processing units
  • the memory 603 is used to store related instructions and data, as well as program codes and data of the network device.
  • the memory 603 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), and an erasable programmable read-only memory (Erasable Programmable Read). Only Memory, EPROM), or Compact Disc Read-Only Memory (CD-ROM).
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable read-only memory
  • CD-ROM Compact Disc Read-Only Memory
  • Figure 6 only shows a simplified design of the network device.
  • the network device may include any number of transmitters, receivers, processors, memories, etc., and all network devices that can implement the present application are within the scope of the present application.
  • the structure of the terminal device includes a processor (or controller), a transceiver, and a modem processor.
  • the structure of the network device may further include a memory coupled to the processor for storing necessary program instructions and data of the network device.
  • Fig. 7 shows a simplified schematic diagram of one possible design structure of the terminal device involved in the above embodiment.
  • the terminal device includes a transceiver 701, a processor 702, a memory 703 and a modem processor 704, a transceiver 701, a processor 702, a memory 703, and a modem processor 704 connected by a bus.
  • the transceiver 701 conditions (e.g., analog conversion, filtering, amplifying, upconverting, etc.) output samples and generates an uplink signal that is transmitted via an antenna to the network device described in the above embodiments.
  • the antenna receives the downlink signal transmitted by the base station in the above embodiment.
  • Transceiver 70 conditions (eg, filters, amplifies, downconverts, digitizes, etc.) the signals received from the antenna and provides input samples.
  • encoder 7041 receives traffic data and signaling messages to be transmitted on the uplink, and processes and formats traffic data and signaling messages (eg, formatting, encoding, and Interwoven).
  • Modulator 7042 further processes (e.g., symbol maps and modulates) the encoded traffic data and signaling messages and provides output samples.
  • Demodulator 7043 processes (e.g., demodulates) the input samples and provides symbol estimates.
  • the decoder 7044 processes (e.g., deinterleaves and decodes) the symbol estimate and provides decoded data and signaling messages that are sent to the terminal device.
  • Encoder 7041, modulator 7042, demodulator 7043, and decoder 7044 may be implemented by a composite modem processor 704. These units are processed according to the radio access technologies employed by the radio access network (e.g., access technologies for LTE, 5G, and other evolved systems).
  • the transceiver 701 is integrated by a transmitter and a receiver. In other embodiments, the transmitter and receiver may also be independent of one another.
  • the processor 702 controls and manages the actions of the terminal device for performing the processing performed by the terminal device in the above embodiment. For example, it is used to control the transmission of the random access preamble by the terminal device according to the received downlink control information and/or other processes of the techniques described in the present invention.
  • the processor 702 is configured to support the terminal device to perform the processing procedure involving the terminal device in FIGS. 2-5.
  • the transceiver 701 is configured to receive downlink control information sent by the network device by using an antenna, and the processor 702 is configured to control, according to the downlink control information, the transceiver to send or not send the random access preamble through the antenna.
  • processor 702 can include one or more processors, for example, including one or more CPUs, which can be integrated into the chip or can be the chip itself.
  • the memory 703 is used to store related instructions and data, as well as program codes and data of the terminal device.
  • the memory 703 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), and an erasable programmable read only memory (Erasable Programmable Read). Only Memory, EPROM), or Compact Disc Read-Only Memory (CD-ROM).
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable read only memory
  • CD-ROM Compact Disc Read-Only Memory
  • Figure 7 only shows a simplified design of the terminal device.
  • the terminal device may include any number of transmitters, receivers, processors, memories, etc., and all terminal devices that can implement the present application are within the scope of the present application.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本申请涉及无线通信技术领域，尤其涉及非授权频段上的随机接入技术。在一种配置随机接入的方法中，网络设备进行信道侦听并竞争到信道占用时间；若在网络设备竞争到的信道占用时间内，配置有用于传输终端设备随机接入前导的时频资源，则网络设备向终端设备发送下行控制信息，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息。通过本申请提供的方案，可以动态地对信道占用时间内的传输随机接入前导的时频资源进行配置，从而灵活地利用信道占用时间，提高在非授权频段上的通信效率。

Description

一种配置随机接入的方法、网络设备及终端设备
本申请要求于2017年7月28日提交中国专利局、申请号为201710630629.8、申请名称为“一种配置随机接入的方法、网络设备及终端设备”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
本申请涉及无线通信技术领域，尤其涉及一种应用于非授权频段上的随机接入技术。
背景技术
随机接入过程是无线通信中的一个基本过程，其主要的目的是使得UE获得上行同步从而进行上行的传输。其中，随机接入过程主要有两种方式：1)基于竞争的随机接入过程；2)基于非竞争的随机接入过程。
对于竞争的随机接入过程，用户需要自己选择用于传输随机接入前导(random access preamble)的时频资源，其中可供选择的时频资源通常是由演进型网络基站(evolved NodeB，eNB)在广播消息中以固定或者半静态的方式配置的。对于非竞争的随机接入过程，用户用于传输随机接入前导的时频资源以及随机接入前导，都可以由eNB指定。
在第五代移动通信(5th-generation，5G)系统的研究中，引入新的无线传输技术和新的体系架构，进一步挖掘新的频谱资源，使得5G系统将在资源利用率、系统吞吐率及频谱资源上全面超越LTE系统。随之而来的，如何在5G系统中更为高效地利用非授权频段随机接入资源是一个亟待解决的问题。
发明内容
本申请实施例描述了一种应用于非授权频段的配置随机接入的方法，旨在通过对信道占用时间及终端设备传输随机前导的时域资源的合理配置，提升通讯系统的通讯效率。
第一方面，本申请提供一种配置随机接入的方法，应用于非授权频段。该配置随机接入的方法包括：网络设备进行信道侦听并竞争到信道占用时间；若在所述信道占用时间内，配置有用于传输终端设备随机接入前导的时频资源，网络设备向终端设备发送下行控制信息，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息。
在非授权频段上，在网络设备传输数据或信令之前需要进行信道侦听以判断信道是否空闲。通过对落入信道占用时间内的预设的传输随机接入前导时域资源进行灵活的配置，可以合理利用已经竞争到的信道占用时间，提升通讯效率。
在一种可能的设计中，所述下行控制信息用于指示终端设备在全部或部分的所述时频资源上禁止传输随机接入前导。
在另一种可能的设计中，所述网络设备向终端设备发送下行控制信息包括：所述网络设备在第一时间点向终端设备发送下行控制信息，所述下行控制信息用于指示所述终端设 备在所述第一时间点之后剩余的信道占用时间内禁止传输随机接入前导。
从而，在网络设备需要传输的数据量或者信令较多时，通过禁止在信道占用时间内的全部或部分预设的时域资源内传输随机接入前导，动态地调整时域资源的分配，灵活地进行传输，提高通讯的效率。
第二方面，本申请还提供另一种配置随机接入的方法，应用于非授权频段。所述配置随机接入的方法包括：终端设备接收网络设备发送的下行控制信息，所述下行控制信息是所述网络设备在竞争到信道占用时间后发送的，在所述信道占用时间内配置有用于传输终端设备随机接入前导的时频资源，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息；根据所述下行控制信息，所述终端设备进行随机接入前导的传输。
基于上述第一方面或第二方面的配置随机接入的方法，在又一种可能的设计中，所述下行控制信息用于配置所述终端设备在传输随机接入前导之前执行或不执行LBT。
在又一种可能的设计中，当执行LBT时，所述下行控制信息用于指示所述终端设备在传输随机接入前导之前执行LBT的类型，所述LBT类型包括第二类型LBT(cat.2LBT)。其中，cat.2LBT采用相对较短空闲信道评估(clear channel assessment,CCA)时长，从而可以节约LBT的时间。
第三方面，本申请提供一种网络设备，用于执行上述第一方面所提供的配置随机接入的方法。其中，网络设备包括：处理器，用于进行信道侦听并竞争到信道占用时间；收发器，用于向一个或多个终端设备发送下行控制信息，所述一个或多个终端已配置在预定的时域资源上传输随机前导，当所述预定的时域资源在所述信道占用时间内时，所述下行控制信息用于指示所述一个或多个终端设备在所述信道占用时间内传输的随机接入前导的配置信息。
第四方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，是的计算机执行上述第一方面所述的方法。
第五方面，本申请提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面所述的方法。
第六方面，本申请提供一种终端设备，用于执行上述第二方面所提供的配置随机接入的方法。其中，终端设备包括处理器和收发器：所述收发器，用于接收网络设备发送的下行控制信息，所述下行控制信息是所述网络设备在竞争到信道占用时间后发送的，在所述信道占用时间内配置有用于传输终端设备随机接入前导的时频资源，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息；所述处理器，用于根据所述下行控制信息，控制所述收发器进行随机接入前导的传输。
第七方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第二方面所提供的方法。
第八方面，本申请提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第二方面所述的方法。
附图说明
下面将参照所示附图对本申请实施例进行更详细的描述。
图1为本申请实施例中的一种可能的应用场景示意图；
图2为本申请实施例中的一种可能的资源指示方法的流程示意图；
图3为本申请实施例中的信道占用时长的示意图；
图4为本申请另一实施例中的信道占用时长的示意图；
图5为本申请又一实施例中的信道占用时长的示意图；
图6为本申请实施例中的一种网络设备的简化结构示意图；
图7为本申请实施例中的一种终端设备的简化结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
请参见图1，是应用本申请实施例的网络架构的简化示意图，该网络架构可以是无线通信系统的网络架构，可以包括网络设备和终端设备，网络设备与终端设备之间通过无线通信技术连接。需要说明的是，图1所示的终端设备和网络设备的数量和形态并不构成对本申请实施例的限定。在不同的实施方式中，一个网络设备可以连接一个或多个多个终端设备。网络设备还可以连接到核心网设备，核心网设备未在图1中示出。
需要说明的是，本申请实施例提及的无线通信系统包括但不限于：窄带物联网系统(narrow band-internet of things，NB-IoT)、全球移动通信系统(global system for mobile communications，GSM)、增强型数据速率GSM演进系统(enhanced data rate for GSM evolution，EDGE)、宽带码分多址系统(wideband code division multiple access，WCDMA)、码分多址2000系统(code division multiple access，CDMA2000)、时分同步码分多址系统(time division-synchronization code division multiple access，TD-SCDMA)，长期演进系统(long term evolution，LTE)、第五代移动通信系统以及未来移动通信系统。
本申请实施例中，上述网络设备是一种部署在无线接入网中，为终端设备提供无线通信功能的装置。网络设备可以包括但不限于基站(Base Station，BS)、网络控制器、传输接收点(transmission and reception point，TRP)或移动交换中心等，示例性地，通过无线信道与终端设备进行直接通信的装置通常是基站。所述基站可以包括各种形式的宏基站、微基站、中继站、接入点或射频拉远单元(Remote Radio Unit，RRU)等。当然，与终端设备进行无线通信的也可以是其他具有无线通信功能的网络设备，本申请对此不做唯一限定。需要说明的是，在不同系统中，具备基站功能的设备的名称可能会有所不同，例如在LTE网络中，称为演进的节点B(evolved NodeB，eNB或eNodeB)，在第三代(the 3rd Generation，3G)网络中，称为节点B(Node B)等，在5G网络中，称为5G基站(NR NodeB，gNB)。
终端设备，又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是一种向用户提供语音和/或数据连通信的设备，例如，具有无线连接功能的手持式设备、车载设备、可穿戴设备、计算设备或链接到无线调制解调器的其他处理设备。目前，一些终端设备的举例为：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote  medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
本申请中，名词“网络”和“系统”可能会交替使用，但本领域的技术人员可以理解其含义。另外，本文中的部分英文简称是以LTE系统为例对本申请实施例进行的描述，其可能随着网络的演进发生变化，具体演进可以参考相应标准中的描述。
本申请各个实施例所涉及的无线通信系统可以支持多载波(multi-carrier)(不同频率的波形信号)操作。多载波发射器可以在多个载波上同时发射调制信号，例如，每一个通信连接都可以承载利用不同无线技术调制的多载波信号。每一个调制信号均可以在不同的载波上发送，也可以承载控制信息(例如参考信号、控制信道等)，开销信息(Overhead Information)，数据等等。
前面已经提及本申请所提供的技术方案可以应用于非授权频段，尤其是应用于非授权频段上的随机接入过程。对于支持非授权频段的无线通信网络而言，在非授权频段上进行传输前通常需要遵守先听后说(listen before talk，LBT)规则，即在发送之前需要先侦听信道，进行空闲信道评估(clear channel assessment，CCA)，CCA可以基于信道能量门限来确定。如果信道空闲，则可以发送；反之，则不能发送。根据不同的应用场景，LBT类型会有所不同，其所采用的侦听持续时间也不同。示例性地，LBT类型至少存在，一类是需要执行随机退避和相对较长侦听时间的类型，可称为第四类LBT(Cat4LBT)；另一类是需要执行相对较短侦听时间的类型，可称为第二类LBT(Cat2LBT)。需要说明的是，对于LBT类型的划分并不作为对本申请实施方式的限定。
接下来，对随机接入进行一些说明。随机接入是无线通信中的一个重要的过程，其目的主要是使得终端设备能够获得上行同步从而进行上行的传输。随机接入过程主要有两种方式：1)基于竞争的随机接入；2)基于非竞争的随机接入。不管是基于竞争的随机接入，还是基于非竞争的随机接入，终端设备都需要向基站发送随机接入前导(random access preamble)。随机接入前导的主要作用是通知基站有一个随机接入请求，从而基站能估计其与终端设备之间的传输时延，以便基站校准上行时间并将校准信息通知终端设备。
对于基于竞争的随机接入而言，基站会在广播信息中通知本小区可用的随机接入前导的格式(符合某一种前导格式的前导可能会有多个)和用于传输随机接入前导的时频资源集合。终端设备发起随机接入时，会随机选择一个符合随机接入前导格式的前导，并从可用的时频资源集合中随机选择一个时频资源来发送所选择的随机接入前导。
对于基于非竞争的随机接入而言，基站会为终端设备指定其用于随机接入的时频资源和前导。基站会通过无线资源控制(radio resource control,RRC)信令和/或物理下行控制信道(physical downlink control channel,PDCCH)中的下行控制信息(downlink control information，DCI)来为终端设备指定随机接入前导或者传输该随机接入前导的时频资源，从而可以避免终端设备之间的随机接入冲突。
下面将结合图2至图5对本申请实施例提供的资源指示方法进行详细说明。
请参见图2，是本申请实施例提供的一种资源指示方法的流程示意图，其应用于网络设备与一个或者多个终端设备的交互中。该一个或多个终端被允许在预定的时域资源上传输随机前导，即，该一个或多个终端在预定的时域资源可以传输随机前导。其中，预定的 时间资源可以是周期性的也可以是非周期性的。上述资源指示方法至少包括以下步骤：
步骤201：网络设备进行信道侦听并竞争到信道占用时间(channel occupy time，COT)。
网络设备在信道侦听结果为空闲时，会竞争到信道占用时间，以进行数据或信令的传输。
示例性地，该信道占用时间的单位可以为子帧(subframe)，每一子帧的长度可以为1ms。
或者，该信道占用时间的单位可以为时隙(slot)，其中每一时隙包含7个或14个正交频分复用(orthogonal frequency division multiplexing,OFDM)符号。
或者，该信道占用时间的单位可以为微时隙(mini-slot)，其中每一微时隙所包含的OFDM符号数要小于一个时隙所包含的OFDM符号数。
上述时间单位仅仅为示例，本领域的技术人员可以采用其他的时间单位来描述信道占用时间。在以下实施方式中，以时隙作为信道占用时间的时间单位为例进行说明，但信道占用时间采用何种时间单位并不作为对本申请配置随机接入的方法的限定。
示例性地，请参照图3，在本实施方式中，网络设备在T0时刻竞争到信道，信道占用的起始时刻为T0，结束时刻为T2。信道占用时间为6个时隙，其中包括4个下行链路(downlink,DL)传输的时隙：时隙1-DL、时隙2-DL、时隙3-DL、时隙4-DL；2个上行链路(uplink，UL)传输的时隙：时隙5-UL、时隙6-UL。在其他的实施例中，上行链路传输的时隙与下行链路传输的时隙在信道占用时间内的比例可以不同。
步骤202：若在信道占用时间内，配置有用于传输终端设备随机接入前导的时频资源，网络设备向终端设备发送下行控制信息，该下行控制信息用于指示在该时频资源上传输随机接入前导的配置信息。
在本实施方式中，先以一个终端设备为例进行说明，可以理解的是，多个终端设备的实施方式可以参照该一个终端设备，在此不再赘述。
下行控制信息(此时，下行控制信息或可称为：随机接入指示信息)用于指示终端设备在信道占用时间内的时频资源上禁止传输随机接入前导。即，该下行控制信息用于指示禁止终端设备在当前信道占用时间内的预设的时频资源传输随机接入前导。具体而言，该下行控制信息可以指示当前信道占用时间内的多个时隙禁止传输随机接入前导，或者，该下行控制信息可以指示当前信道占用时间内某一时隙禁止传输随机接入前导。从而，在信道占用时间内需要传输数据量或者信令较多时，网络设备可以利用传输随机前导的时域资源上继续进行传输，而在被禁止的时域资源以外的其它时域资源传输随机前导，动态地调整时域资源的分配，灵活地进行传输，从而提高通讯的效率。
请参照图4，以时隙5-UL为预设的用于终端设备传输随机前导的时域资源，网络设备在T1时刻发送下行控制信息，用于指示禁止该终端设备在时隙5-UL传输随机接入前导。
请参照图5，以时隙5-UL和时隙6-UL均为传输随机接入前导的时域资源为例，该下行控制信息可以指示分别禁止时隙5-UL，或者时隙6-UL传输随机接入前导，或者还可以指示同时禁止时隙5-UL和时隙6-UL传输随机接入前导。
网络设备在第一时间点T1向一个或多个终端设备发送下行控制信息，其中该下行控制信息用于指示终端设备在第一时间点之后剩余的信道占用时间内如何传输随机接入前导，即指示T1到T2的时间窗口内随机接入前导的传输的配置。在不同的实施方式中，T1到T2的时间窗口可以通过绝对时间偏移量或者相对时间偏移量来表示。
在其他的实施方式中，下行控制信息内还可以默认指示的是T1时刻(即，发送下行控制信息的时刻)之后第一个用于传输随机接入前导的时域资源。
在又一个实施方式中，下行控制信息(此时，下行控制信息或称为：LBT指示信息)用于配置终端设备在传输随机接入前导之前执行或不执行LBT。前面已经说明，工作在非授权频段时，终端设备在发送随机接入前导之前需要进行LBT以确定信道是否空闲，在确认信道空闲时，才能够在预定的时间资源上传输随机接入前导。然而，在网络设备已经抢占到信道占用时间时，网络设备可以进行接收，那么也可以指示终端设备不执行LBT，当到达预设的时域资源时，向网络设备发送随机前导，从而可节约了接入时间。示例性地，网络设备可以通过眀式方式携带一个或多个终端设备的标识，或者可以通过隐式方式指携带一个或多个终端的标识，以指示该终端设备不执行LBT。
在其他的实施方式中，当需要进行LBT时，下行控制信息可以用于指示一个或多个终端设备在传输随机接入前导之前执行LBT的类型。该LBT的类型包括但不限于：采用相对较短空闲信道评估(clear channel assessment,CCA)时长进行侦听，例如第二类型LBT(cat 2LBT)，从而在需要进行LBT时，可以采用相对较短的时长，提高随机接入效率。
示例性地，下行控制信息可以通过2比特来指示上述随机接入信息，或者上述LBT指示信息。以“10”指示当前信道占用时间内的随机接入前导预设的时域资源不可用，“00”指示当前信道占用时间内的随机接入前导传输之前采用cat 2LBT，“01”指示当前信道占用时间内的随机接入前导传输之前不进行LBT，“11”为预留指示。可以理解的是，上述“10”、“00”、“01”、“11”的指示仅仅为示例，并不作为限定。在不同的实施方式中，上述“10”、“00”、“01”、“11”所指示的内容可以交换。
步骤203：终端设备接收下行控制信息，并根据下行控制信息进行随机接入前导的传输。
终端设备可以通过解扰操作识别出自身的下行控制信息。示例性，针对一个终端设备的场景，其可以根据自身的无线网络临时标识(radio network temporary identifier，RNTI)对接收到的信令进行解扰获得自身的下行控制信息；针对多个终端设备的场景，多个终端设备可以根据公共RNTI对接收到的信令进行解扰获得自身的下行控制信息。多个终端设备可以是以小区来划分的，或者是以小组来划分的，对此不作限制。
示例性地，当下行控制信息指示在信道占用时间内的预设的时域资源禁止传输随机接入前导时，终端设备在相应的时域资源不传输随机接入前导，而在用于传输随机接入前导的时域资源集合中随机选择其他的时域资源进行随机接入前导的传输。
示例性地，当下行控制信息指示终端设备在信道占用时间内传输随机接入前导前不执行LBT时，在到达预设的时域资源时，终端设备向网络设备发送随机接入前导，而不必等待LBT。
示例性地，当下行控制信息指示终端在信道占用时间内传输随机接入前导前执行LBT类型时，在到达预设的时域资源时，终端设备采用所指示的LBT类型，从而可以节省LBT的时间。
通过应用上述配置随机接入的方法，能够动态地调整时域资源的分配，合理利用信道占用时间，从而提高通讯系统的效率。
在其他的实施方式中，上述下行控制信息中还可以包含如下几种参数中的一种或者多 种，以向终端设备动态地通知随机接入前导的时频资源：
1.时域起始时刻，用于指示时频资源在时域上的起始点。一般地，时域起始时刻与OFDM符号的边界、微时隙的边界、时隙的边界或子帧的边界对齐。需要说明的是，由于前导的格式决定了前导传输需要的时间，因此，在指示了上述时域起始时刻时，终端设备就可以获取用于传输前导的时域资源。示例性地，上述时域起始时刻，可以采用以下几种方式中的一种或者多种来实现：
1)绝对偏移量：以下行控制信息所占用的时域资源上的起始时刻或结束时刻为基准时刻，指示基准时刻与上述时频资源的起始时刻之间的时间偏移量。例如，以微秒(us)为单位，10bits的通知下行控制信息可以表示的时间偏移量范围是[0～1023]us；
2)基于符号的相对偏移量：以下行控制信息所占用的时域资源上的起始符号或者结束符号为基准符号，指示基准符号与分配给终端设备的随机接入的时频资源的起始符号之间的偏移量(以符号为单位)。例如，假设最多允许基准符号与分配给终端设备的随机接入的时频资源的时域起始时刻之间间隔64个符号。如果指示粒度为1个符号时，需要6bits的指示开销；如果指示粒度为2个符号时，需要5bits的指示开销。网络设备还可以在下行控制信息中指示偏移量的指示粒度。
3)基于帧结构分级的相对偏移量：按照帧结构的配置，来指示偏移量。例如，前述帧结构的配置，以子帧-时隙-微时隙-符号分级为例，指示下行控制信息与所要通知的随机接入的时频资源在时间维度上的偏移量。假定分别采用2bits来表示子帧、时隙、微时隙和符号的4种不同单位的时间偏移量，则11100100就表示偏移量为3ms+2个时隙+1个微时隙，00111001就表示偏移量为3个时隙+2个微时隙+1个OFDM符号。
需要说明的是，在不同的无线通讯系统中，一个OFDM符号在时域上的长度可以是可变的，也可以是不可变的。以OFDM符号在时域上的长度为不固定的为例，OFDM符号的长度会随着子载波间隔的变化而变化。对于具备常规循环前缀(cyclic prefix,CP)的OFDM符号而言，一个子载波间隔为15KHz的OFDM符号的长度等于2个子载波间隔为30KHz的OFDM符号的长度之和，等于4个子载波间隔为60KHz的OFDM符号的长度之和。因此，OFDM符号长度不同时，一个子帧、时隙或者微时隙中所包含的OFDM符号数目不同。鉴于此，针对第2)方式和第3)种方式，其前提在于终端设备可以通过如下几种方法获知OFDM符号所对应的参数配置：
1)显示指示：一种显示指示的方法是，网络设备在指示前述基于符号的相对偏移量的下行控制信息中同时指示该OFDM符号所对应的参数配置，例如，长度、子载波间隔、循环前缀(cyclic prefix，CP)类型或者长度中的至少一项。或者，另一种显示指示的方法是，网络设备在指示前述基于符号的相对偏移量的下行控制信息之外的其他控制信令中指示获取该OFDM符号所对应的参数配置，例如，长度、子载波间隔、CP类型或者长度中的至少一项。
2)隐式指示：一种隐式指示的方法为，默认OFDM符号所对应的参数配置与发送下行控制信息所采用的参数配置相同；或者，另一种隐式指示的方法为，默认OFDM符号所对应的子载波间隔与网络设备下行传输允许采用的最大频域子载波间隔相同；或者，又一种隐式指示的方法为，默认OFDM符号所对应的子载波间隔与时频资源上允许的随机接入前导格式所对应的随机接入前导的子载波间隔相同。
2.频域起始位置，用于指示时频资源在频域上的位置。一般地，频域位置是以资源块(resource block，RB)的频域宽度(例如，12个子载波)为单位来衡量的。随机接入前导的格式决定了其在频域上的RB宽度(即，所占用的RB数目，RB之间连续放置)，此时，网络设备提供频域起始位置，终端设备可以获取用于传输前导的全部频域资源。
另外，在非授权频段上，用于传输前导的多个RB在频域上等间隔非连续放置(例如，在LTE版本14中所引入的增强型授权辅助接入(enhanced licensed assisted access，eLAA)技术中，非授权频段上的上行数据传输所占用的频域资源以10个RB为间隔的资源交错(interlace)为单位分配)。此时，网络设备所指示的起始RB位置就是传输前导所占用的资源交错的起始RB的位置，即该资源交错的索引(index)。
通过动态地指示传输随机接入前导的时频资源，可以灵活地进行资源分配，以适应非授权频段场景下的先听后说传输机制。
上面详细阐述了本申请的配置随机接入方法的实施方式，下面将继续阐述本申请的网络设备及终端设备的实施方式。
先说明网络设备的实施方式，在一个具体的示例中，网络设备的结构中包括处理器(或称：控制器)和收发器。在一个可能的示例中，网络设备的结构中还可以包括通信单元。该通信单元用于支持与其他网络侧设备之间的通信，如与核心网节点之间的通信。在一个可能的示例中，所述网络设备的结构中还可以包括存储器，所述存储器与处理器耦合，用于保存网络设备必要的程序指令和数据。
请参照图6，其示出了上述实施方式中所涉及的网络设备的一种可能的简化结构示意图。在图6所对应的示例中，本申请所涉及的网络设备的结构中包括收发器601、处理器602、存储器603和通信单元604，收发器601、处理器602、存储器603和通信单元604通过总线连接。
在下行链路上，待发送的数据或信令(包括上述下行控制信息)经过收发器601调节输出采样并生成下行链路信号，该下行链路信号经由天线发射给上述实施例中所述的终端设备。在上行链路上，天线接收上述实施例中终端设备发射的上行链路信号(包括上述随机接入前导)，收发器602调节从天线接收的信号并提供输入采样。在处理器602中，对业务数据和信令消息进行处理，例如对待发送的数据进行调制、SC-FDMA符号生成等。这些单元根据无线接入网采用的无线接入技术(例如，LTE、5G及其他演进系统的接入技术)来进行处理。在图6所示的实施方式中，收发器602由发射器和接收器集成。在其他的实施方式中，发射器和接收器也可以相互独立。
所述处理器602还用于对网络设备的动作进行控制管理，用于执行上述实施例中由网络设备进行的处理，例如用于控制网络设备对下行控制信息进行处理和/或进行本申请所描述的技术的其他过程。作为示例，处理器602用于支持网络设备执行图2～图6中涉及网络设备的处理过程。例如，处理器602进行信道侦听并竞争到信道占用时间。具体地，处理器602基于收发器602从天线所接收到的信号来进行信道侦听，并控制收发器从天线发送信号来占用信道。在不同的实施方式中，处理器602可以包括一个或多个处理器，例如包括一个或多个中央处理器(Central Processing Unit，CPU)，处理器602可以集成于芯片中，或者可以为芯片本身。
存储器603用于存储相关指令及数据，以及所述网络设备的程序代码和数据。在不同 的实施方式中，存储器603包括但不限于是随机存储记忆体(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、或便携式只读存储器(Compact Disc Read-Only Memory，CD-ROM)。
可以理解的是，图6仅仅示出了所述网络设备的简化设计。在实际应用中，所述网络设备可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本申请的网络设备都在本申请的保护范围之内。
接下来，说明终端设备的实施方式，在一个具体的实例中，终端设备的结构中包括处理器(或称：控制器)、收发器和调制解调处理器。在一个可能的示例中，所述网络设备的结构中还可以包括存储器，所述存储器与处理器耦合，用于保存网络设备必要的程序指令和数据。
图7示出了上述实施例中所涉及的终端设备的一种可能的设计结构的简化示意图。终端设备包括收发器701，处理器702，存储器703和调制解调处理器704，收发器701，处理器702，存储器703和调制解调处理器704通过总线连接。
收发器701调节(例如，模拟转换、滤波、放大和上变频等)输出采样并生成上行链路信号，该上行链路信号经由天线发射给上述实施例中所述的网络设备。在下行链路上，天线接收上述实施例中基站发射的下行链路信号。收发器70调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。示例性地，在调制解调处理器704中，编码器7041接收要在上行链路上发送的业务数据和信令消息，并对业务数据和信令消息进行处理(例如，格式化、编码和交织)。调制器7042进一步处理(例如，符号映射和调制)编码后的业务数据和信令消息并提供输出采样。解调器7043处理(例如，解调)该输入采样并提供符号估计。解码器7044处理(例如，解交织和解码)该符号估计并提供发送给终端设备的已解码的数据和信令消息。编码器7041、调制器7042、解调器7043和解码器7044可以由合成的调制解调处理器704来实现。这些单元根据无线接入网采用的无线接入技术(例如，LTE、5G及其他演进系统的接入技术)来进行处理。在图7所示的实施方式中，收发器701由发射器和接收器集成。在其他的实施方式中，发射器和接收器也可以相互独立。
处理器702对终端设备的动作进行控制管理，用于执行上述实施例中由终端设备进行的处理。例如用于控制终端设备根据接收到的下行控制信息进行随机接入前导的传输和/或本发明所描述的技术的其他过程。作为示例，处理器702用于支持终端设备执行图2～5中涉及终端设备的处理过程。例如，收发器701用于通过天线接收网络设备发送的下行控制信息，处理器702用于根据下行控制信息，控制收发器通过天线发送或者不发送随机接入前导。在不同的实施方式中，处理器702可以包括一个或多个处理器，例如包括一个或多个CPU，处理器702可以集成于芯片中，或者可以为芯片本身。
存储器703用于存储相关指令及数据，以及终端设备的程序代码和数据。在不同的实施方式中，存储器703包括但不限于是随机存储记忆体(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、或便携式只读存储器(Compact Disc Read-Only Memory，CD-ROM)。
可以理解的是，图7仅仅示出了所述终端设备的简化设计。在实际应用中，所述终端 设备可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本申请的终端设备都在本申请的保护范围之内。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。

Claims (18)

  1. 一种配置随机接入的方法，其特征在于，应用于非授权频段，所述配置随机接入的方法包括：
    网络设备进行信道侦听并竞争到信道占用时间；
    若在所述信道占用时间内，配置有用于传输终端设备随机接入前导的时频资源，网络设备向终端设备发送下行控制信息，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息。
  2. 如权利要求1所述的方法，其特征在于，所述下行控制信息用于指示所述终端设备在全部或部分所述时频资源上禁止传输随机接入前导。
  3. 如权利要求2所述的方法，其特征在于，所述网络设备向终端设备发送下行控制信息包括：
    所述网络设备在第一时间点向终端设备发送下行控制信息，所述下行控制信息用于指示所述终端设备在所述第一时间点之后剩余的信道占用时间内禁止传输随机接入前导。
  4. 如权利要求1所述的方法，其特征在于，所述下行控制信息用于配置所述终端设备在传输随机接入前导之前执行或不执行LBT。
  5. 如权利要求4所述的方法，其特征在于，当执行LBT时，所述下行控制信息用于指示所述一个或多个终端设备在传输随机接入前导之前执行LBT的类型，所述LBT类型包括第二类型LBT。
  6. 一种配置随机接入的方法，其特征在于，应用于非授权频段，包括：
    终端设备接收网络设备发送的下行控制信息，所述下行控制信息是所述网络设备在竞争到信道占用时间后发送的，在所述信道占用时间内配置有用于传输终端设备随机接入前导的时频资源，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息；
    根据所述下行控制信息，所述终端设备进行随机接入前导的传输。
  7. 一种网络设备，其特征在于，可应用于非授权频段，所述网络设备包括处理器和收发器：
    所述处理器，用于进行信道侦听并竞争到信道占用时间；
    若在所述信道占用时间内，配置有用于传输终端设备随机接入前导的时频资源，所述收发器，用于向终端设备发送下行控制信息，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息。
  8. 如权利要求7所述的网络设备，其特征在于，所述下行控制信息用于指示所述终端设备在所述信道占用时间内禁止传输随机接入前导。
  9. 如权利要求8所述的网络设备，其特征在于，所述收发器用于：
    在第一时间点向终端发送下行控制信息，所述下行控制信息用于指示所述终端设备在所述第一时间点之后剩余的信道占用时间内禁止传输随机接入前导。
  10. 如权利要求7所述的网络设备，其特征在于，所述下行控制信息用于配置所述一个或多个终端设备在传输随机接入前导之前执行或不执行LBT。
  11. 如权利要求10所述的网络设备，其特征在于，当执行LBT时，所述下行控制信息用于指示所述一个或多个终端设备在传输随机接入前导之前执行LBT的类型，所述LBT类型包括第二类型LBT。
  12. 一种终端设备，其特征在于，可应用于非授权频段，所述终端设备包括处理器和收发器：
    所述收发器，用于接收网络设备发送的下行控制信息，所述下行控制信息是所述网络设备在竞争到信道占用时间后发送的，在所述信道占用时间内配置有用于传输终端设备随机接入前导的时频资源，所述下行控制信息用于指示在所述时频资源上传输随机接入前导的配置信息；
    所述处理器，用于根据所述下行控制信息，控制所述收发器进行随机接入前导的传输。
  13. 一种计算机存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1-5任意一项所述的方法。
  14. 一种计算机存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求6所述的方法。
  15. 一种网络设备，其特征在于，所述网络设备包括存储器和一个或多个处理器，所述存储器与所述一个或多个处理器耦合，所述一个或多个处理器用于执行如权利要求1-5任意一项所述的方法。
  16. 一种网络设备，其特征在于，所述网络设备包括一个或多个处理器，所述一个或多个处理器与存储器耦合，读取所述存储器中的指令并根据所述指令执行如权利要求1-5任一项所述的方法。
  17. 一种终端设备，其特征在于，所述终端设备包括存储器和一个或多个处理器，所述存储器与所述一个或多个处理器耦合，所述一个或多个处理器用于执行如权利要求6所述的方法。
  18. 一种终端设备，其特征在于，所述网络设备包括一个或多个处理器，所述一个或多个处理器与存储器耦合，读取所述存储器中的指令并根据所述指令执行如权利要求6所述的方法。
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