WO2023066383A1 - 数据传输方法、装置及存储介质 - Google Patents

数据传输方法、装置及存储介质 Download PDF

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Publication number
WO2023066383A1
WO2023066383A1 PCT/CN2022/126771 CN2022126771W WO2023066383A1 WO 2023066383 A1 WO2023066383 A1 WO 2023066383A1 CN 2022126771 W CN2022126771 W CN 2022126771W WO 2023066383 A1 WO2023066383 A1 WO 2023066383A1
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WO
WIPO (PCT)
Prior art keywords
base station
terminal
anchor base
data packet
small data
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/CN2022/126771
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English (en)
French (fr)
Inventor
孙建成
傅婧
苗金华
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment 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 Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Priority to EP22882987.5A priority Critical patent/EP4422302A4/en
Priority to US18/698,788 priority patent/US20240414802A1/en
Publication of WO2023066383A1 publication Critical patent/WO2023066383A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0247—Traffic management, e.g. flow control or congestion control based on conditions of the access network or the infrastructure network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to a data transmission method, device and storage medium.
  • RRC Inactive RRC Inactive
  • the goal of the RRC Inactive state is to achieve power saving and acceptable access delay.
  • the UE When the user equipment (User Equipment, UE) is in the RRC Inactive state, from the perspective of the core network, the UE is still in the CM_Connected state (non-access stratum state), and the radio access network (Radio Access Network, RAN) and the UE are both reserved The context of the UE's access layer, but the UE's air interface resources have been released. Similar to the RRC Idle state, the UE can perform cell reselection and receive broadcast system information and paging messages in the RRC Inactive state. The difference is that the UE can quickly recover to the connection state.
  • CM_Connected state non-access stratum state
  • Radio Access Network Radio Access Network
  • the UE needs to first recover from the RRC Inactive state to the RRC Connected state, and then transmit uplink and downlink data packets in the RRC Connected state.
  • Non-access Stratum NAS
  • the current transmission process is too cumbersome and inefficient.
  • the present disclosure provides a data transmission method, device and storage medium, so that the process of downlink small data transmission by a terminal in the RRC Inactive state is more concise and efficient.
  • the present disclosure provides a data transmission method applied to a terminal, and the method includes:
  • the terminal receiving an air interface paging message from the first base station to the terminal, wherein the air interface paging message includes downlink small data transmission SDT indication information, the terminal is in the radio resource control RRC inactive state, and the first base station Be an anchor base station or a non-anchor base station;
  • the recovered SDT related configuration receive the downlink small data packet sent by the first base station.
  • the restoration of the SDT related configuration in the RRC Inactive state includes:
  • the preset SDT-related radio bearer configuration information restore the configuration of the SDT-related radio bearer, and send an RRC recovery request message to the first base station, and the RRC recovery request message is used to request the first base station to restore the SDT-related radio bearer bearer.
  • the preset SDT-related configuration information includes configuration information provided by the anchor base station for SDT when the terminal enters the RRC Inactive state, or preset SDT default configuration information.
  • the downlink small data packet includes downlink SDT data or non-access stratum NAS signaling.
  • the terminal state is restored from the RRC Inactive state to the RRC connection Connected state.
  • the present disclosure provides a data transmission method, which is applied to an anchor base station, and the method includes:
  • the point base station sends an air interface paging message to the terminal; wherein, the RAN paging message and the air interface paging message include downlink small data transmission SDT indication information;
  • the downlink small data packet is sent to the terminal directly or through a non-anchor base station.
  • the sending the downlink small data packet to the terminal through the non-anchor base station includes:
  • the terminal responds to the air interface paging message sent by the non-anchor base station, sending the terminal context information of the terminal to the non-anchor base station;
  • the processed downlink small data packet is sent to the non-anchor base station, so that the non-anchor base station performs the processing on the received terminal context information according to the terminal context information.
  • the processed downlink small data packet is subjected to the second processing and sent to the terminal.
  • the directly sending the downlink small data packet to the terminal includes:
  • the downlink small data packet is sent to the terminal after the first processing and the second processing.
  • the sending the terminal context information of the terminal to the non-anchor base station includes:
  • the terminal context information request message includes the maximum SDT data processing capability of the non-anchor base station
  • the sending the terminal context information of the terminal to the non-anchor base station in response to the terminal context information request message includes:
  • the non-anchor base station determines that the SDT process is used to transmit the downlink small data packet, and send the terminal context information of the terminal to the non-anchor point The base station; wherein the terminal context information includes SDT-related configuration information of the terminal.
  • the terminal context information is SDT-related configuration information of the terminal.
  • the terminal context information is full context information of the terminal, wherein the full context information includes SDT related configuration information of the terminal.
  • the method also includes:
  • the SDT process is not used to transmit the downlink small data packet, and the full amount of terminal context information of the terminal and the downlink small data packet The data packet is sent to the non-anchor base station for anchor transfer.
  • the first processing includes encapsulating the NAS signaling in an RRC message, and performing packet data convergence protocol PDCP processing; or,
  • the first processing includes performing service data adaptation protocol SDAP processing and PDCP processing on the downlink SDT data;
  • the second processing includes at least one of the following: processing at the physical layer, processing at the MAC layer, and processing at the RLC layer.
  • the sending the processed downlink small data packet to the non-anchor base station includes:
  • the downlink small data packet is downlink SDT data
  • the downlink small data packet is NAS signaling, send the processed downlink small data packet to the non-anchor base station through the Xn interface.
  • the method also includes:
  • an RRC release message is generated and transmitted to the terminal, so that the terminal stops receiving the downlink small data packet according to the RRC release message, and enters the RRC Idle state or the RRC Inactive state .
  • the present disclosure provides a data transmission method, which is applied to a non-anchor base station, and the method includes:
  • radio access network RAN paging information sent by the anchor base station where the RAN paging information is sent by the anchor base station to non-anchor base stations in the RNA area;
  • the terminal If it is determined that the terminal responds to the air interface paging message of the non-anchor base station, acquiring terminal context information of the terminal from the anchor base station;
  • the acquiring the terminal context information of the terminal from the anchor base station includes:
  • the terminal context information request message includes the maximum data processing capability of the non-anchor base station
  • the receiving the terminal context information of the terminal sent by the anchor base station according to the terminal context information request message includes:
  • the downlink small data packet is sent to the terminal after first processing and second processing according to the full amount of terminal context information of the terminal.
  • the acquiring the first-processed downlink small data packet from the anchor base station includes:
  • the downlink small data packet is downlink SDT data
  • allocate a downlink SDT data forwarding tunnel to the downlink SDT data and send downlink SDT data forwarding tunnel information to the anchor base station;
  • the downlink small data packet is NAS signaling, receiving the first processed downlink small data packet sent by the anchor base station through the Xn interface.
  • the present disclosure provides a terminal, including a memory, a transceiver, and a processor:
  • the memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:
  • the terminal receiving an air interface paging message from the first base station to the terminal, wherein the air interface paging message includes downlink small data transmission SDT indication information, the terminal is in the radio resource control RRC inactive state, and the first base station Be an anchor base station or a non-anchor base station;
  • the recovered SDT related configuration receive the downlink small data packet sent by the first base station.
  • the processor restores the SDT-related configuration in the RRC Inactive state according to the preset SDT-related configuration information, it is used to:
  • the preset SDT-related radio bearer configuration information restore the configuration of the SDT-related radio bearer, and send an RRC recovery request message to the first base station, and the RRC recovery request message is used to request the first base station to restore the SDT-related radio bearer bearer.
  • the preset SDT-related configuration information includes configuration information provided by the anchor base station for SDT when the terminal enters the RRC Inactive state, or preset SDT default configuration information.
  • the downlink small data packet includes downlink SDT data or non-access stratum NAS signaling.
  • the processor restores the SDT related configuration in the RRC Inactive state, it is also used to:
  • the terminal state is restored from the RRC Inactive state to the RRC connection Connected state.
  • the processor restores the SDT related configuration in the RRC Inactive state, it is also used to:
  • an anchor base station including a memory, a transceiver, and a processor:
  • the memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:
  • the point base station sends an air interface paging message to the terminal; wherein, the RAN paging message and the air interface paging message include downlink small data transmission SDT indication information;
  • the downlink small data packet is sent to the terminal directly or through a non-anchor base station.
  • the processor when the processor sends the downlink small data packet to the terminal through the non-anchor base station, it is configured to:
  • the terminal responds to the air interface paging message sent by the non-anchor base station, sending the terminal context information of the terminal to the non-anchor base station;
  • the processed downlink small data packet is sent to the non-anchor base station, so that the non-anchor base station performs the processing on the received terminal context information according to the terminal context information.
  • the processed downlink small data packet is subjected to the second processing and sent to the terminal.
  • the processor when the processor directly sends the downlink small data packet to the terminal, it is used to:
  • the downlink small data packet is sent to the terminal after the first processing and the second processing.
  • the processor when the processor sends the terminal context information of the terminal to the non-anchor base station, it is configured to:
  • the terminal context information request message includes the maximum SDT data processing capability of the non-anchor base station
  • the processor sends the terminal context information to the non-anchor base station in response to the terminal context information request message, it is configured to:
  • the non-anchor base station determines to use the SDT process to transmit the downlink small data packet, and send the terminal context information to the non-anchor base station.
  • the terminal context information is SDT-related configuration information of the terminal.
  • the terminal context information is full context information of the terminal, wherein the full context information includes SDT related configuration information of the terminal.
  • the processor is also used for:
  • the SDT process is not used to transmit the downlink small data packet, and the full amount of terminal context information of the terminal and the downlink small data packet The data packet is sent to the non-anchor base station for anchor transfer.
  • the second processing includes at least one of the following: processing at the physical layer, processing at the MAC layer, and processing at the RLC layer;
  • the first processing includes encapsulating the NAS signaling in an RRC message, and performing packet data convergence protocol PDCP processing; or,
  • the first processing includes performing service data adaptation protocol SDAP processing and PDCP processing on the downlink SDT data.
  • the processor when the processor sends the processed downlink small data packet to the non-anchor base station, it is configured to:
  • the downlink small data packet is downlink SDT data
  • the downlink small data packet is NAS signaling, send the processed downlink small data packet to the non-anchor base station through the Xn interface.
  • the processor is also used for:
  • an RRC release message is generated and transmitted to the terminal, so that the terminal stops receiving the downlink small data packet according to the RRC release message, and enters the RRC Idle state or the RRC Inactive state .
  • the present disclosure provides a non-anchor base station, including a memory, a transceiver, and a processor:
  • the memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:
  • radio access network RAN paging information sent by the anchor base station where the RAN paging information is sent by the anchor base station to non-anchor base stations in the RNA area;
  • the terminal If it is determined that the terminal responds to the air interface paging message of the non-anchor base station, acquiring terminal context information of the terminal from the anchor base station;
  • the processor when acquiring the terminal context information of the terminal from the anchor base station, the processor is configured to:
  • the terminal context information request message includes the maximum data processing capability of the non-anchor base station
  • the processor When receiving the terminal context information of the terminal sent by the anchor base station according to the terminal context information request message, the processor is configured to:
  • the processor after the processor sends the terminal context information request message to the anchor base station, it is further configured to:
  • the downlink small data packet is sent to the terminal after performing the first processing and the second processing according to the full amount of context information of the terminal.
  • the processor when the processor obtains the first processed downlink small data packet from the anchor base station, it is configured to:
  • the downlink small data packet is downlink SDT data
  • allocate a downlink SDT data forwarding tunnel to the downlink SDT data and send downlink SDT data forwarding tunnel information to the anchor base station;
  • the downlink small data packet is NAS signaling, receiving the first processed downlink small data packet sent by the anchor base station through the Xn interface.
  • the present disclosure provides a terminal, including:
  • the receiving unit is configured to receive an air interface paging message from the first base station to the terminal, wherein the air interface paging message includes downlink small data transmission SDT indication information, and the terminal is in an RRC inactive state,
  • the first base station is an anchor base station or a non-anchor base station;
  • a processing unit configured to restore SDT-related configurations in the RRC Inactive state according to the indication information of the downlink SDT included in the air interface paging message;
  • the receiving unit is further configured to receive the downlink small data packet sent by the first base station according to the recovered SDT related configuration.
  • an anchor base station including:
  • the receiving unit is used to receive the downlink small data packet sent by the core network to the terminal in the RRC Inactive state;
  • the paging unit is configured to send an air interface paging message to the terminal, and/or send a RAN paging message to a non-anchor base station in a notification area RNA based on the radio access network RAN, and the RAN paging message uses Instructing the non-anchor base station to send an air interface paging message to the terminal; wherein, the RAN paging message and the air interface paging message include downlink small data transmission SDT indication information;
  • a sending unit configured to send the downlink small data packet to the terminal directly or through a non-anchor base station if it is determined that the terminal responds to the air interface paging message.
  • the present disclosure provides a non-anchor base station, including:
  • a receiving unit configured to receive radio access network RAN paging information sent by an anchor base station, where the RAN paging information is sent by the anchor base station to non-anchor base stations in the RNA area;
  • the paging unit is configured to initiate air interface paging for the terminal according to the RAN paging message of the anchor base station, wherein the RAN paging message and the air interface paging message include downlink small data transmission SDT indication information, and the terminal In the RRC Inactive state;
  • An acquiring unit configured to acquire the terminal context information of the terminal from the anchor base station if it is determined that the terminal responds to the air interface paging message of the non-anchor base station;
  • the downlink small data packet
  • a sending unit configured to perform a second process on the downlink small data packet according to the terminal context information, and send it to the terminal.
  • the present disclosure provides a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the first aspect, the second aspect or the first aspect. methods described in three respects.
  • the disclosure provides a data transmission method, device, and storage medium.
  • the anchor base station After receiving a downlink small data packet sent by the core network to a terminal in the RRC Inactive state, the anchor base station initiates air interface paging to the terminal, and sends a call to a non-anchor in RNA.
  • the point base station initiates RAN paging; the air interface paging message and RAN paging message include downlink small data transmission SDT indication information; after receiving the paging to air interface paging message, the terminal can, according to the preset SDT related configuration information, In the RRC Inactive state to restore the SDT related configuration, the anchor base station can send the downlink small data packet to the terminal directly or through the non-anchor base station.
  • the terminal when performing downlink small data transmission, the terminal remains in the RRC Inactive state, and only restores the SDT related configuration, so that it can receive the data directly sent by the anchor base station or sent by the non-anchor base station according to the restored SDT related configuration
  • Small downlink data packets make the downlink small data transmission process more concise and efficient.
  • FIG. 1 is a system schematic diagram of a data transmission method provided by an embodiment of the present disclosure
  • FIG. 2 is a flowchart of a data transmission method provided by an embodiment of the present disclosure
  • FIG. 3 is a signaling diagram of a data transmission method provided by an embodiment of the present disclosure.
  • FIG. 4 is a signaling diagram of a data transmission method provided by another embodiment of the present disclosure.
  • FIG. 5 is a signaling diagram of a data transmission method provided by another embodiment of the present disclosure.
  • FIG. 6 is a flowchart of a data transmission method provided by another embodiment of the present disclosure.
  • FIG. 7 is a flowchart of a data transmission method provided by another embodiment of the present disclosure.
  • FIG. 8 is a structural diagram of a terminal provided by an embodiment of the present disclosure.
  • FIG. 9 is a structural diagram of an anchor base station provided by an embodiment of the present disclosure.
  • FIG. 10 is a structural diagram of a non-anchor base station provided by an embodiment of the present disclosure.
  • FIG. 11 is a structural diagram of a terminal provided by another embodiment of the present disclosure.
  • FIG. 12 is a structural diagram of an anchor base station provided by another embodiment of the present disclosure.
  • Fig. 13 is a structural diagram of a non-anchor base station provided by another embodiment of the present disclosure.
  • RRC Inactive state based on the RRC Connected state and RRC Idle state for the next generation (such as the fifth generation, 5G) wireless communication network.
  • the goal of the RRC Inactive state is to achieve power saving and acceptable access delay.
  • the UE is still in the CM_Connected state (non-access stratum state), and both the RAN and the UE retain the context of the UE's access stratum, but the UE's air interface resources have been released.
  • the RRC Idle state is similar. The UE can perform cell reselection and receive system information broadcast and paging messages in the RRC Inactive state. The difference is that the UE can quickly return to the connected state.
  • the UE in the RRC Inactive state needs to transmit uplink and downlink data packets
  • the UE needs to first restore the RRC Inactive state to the RRC Connected state, and then transmit the uplink and downlink data packets in the RRC Connected state.
  • the anchor base station is the base station for RRC connection before the terminal enters the RRC Inactive state (the last serving base station). After the terminal enters the RRC Inactive state, the anchor base station still maintains the connection with the core network, that is, from the perspective of the core network, The UE is still in the CM_Connected state (non-access stratum state). At this time, both the anchor base station and the terminal retain the terminal context information during the RRC connection. The terminal is not connected to the anchor base station, and the air interface resources have been released.
  • the terminal can perform cell reselection and receive system information broadcast and paging messages in the RRC Inactive state, and as long as the terminal is within the coverage area of the anchor base station, the anchor base station can quickly recover to RRC Connected state, restore the RRC connection between the terminal and the anchor base station; and if the terminal moves out of the coverage area of the anchor base station, but does not move out of the notification area (RAN Notification Area, RNA) based on RAN (Radio Access Network, radio access network) , the terminal does not need to perform core network tracking area update when moving in the RNA area, the anchor base station can initiate RAN paging in the RNA area, that is, notify the non-anchor base station in the RNA area to initiate air interface paging, if the terminal is in the RNA area If any non-anchor base station in the network responds to the paging, the anchor base station can send the context of the terminal to the non-anchor base station to perform anchor transfer and path switching, and
  • the RRC Inactive state is restored to the RRC Connected state, and if the UE is not under the anchor base station, anchor transfer and path switching are required, resulting in downlink small data packets or NAS
  • the message transmission process is too cumbersome and inefficient.
  • the present disclosure provides a data transmission method.
  • the anchor base station After receiving a downlink small data packet sent by the core network to a terminal in the RRC Inactive state, the anchor base station initiates air interface paging of the terminal, and In the RNA, RAN paging is initiated to the non-anchor base station, so that the non-anchor base station initiates air interface paging of the terminal according to the RAN paging message; the air interface paging message and the RAN paging message include the indication of downlink small data transmission SDT information; after the terminal receives the paging to air interface paging message, it can restore the SDT related configuration in the RRC Inactive state according to the preset SDT related configuration information, and the anchor base station can directly or through the non-anchor base station send the downlink small data packet sent to the terminal.
  • the terminal when performing downlink small data transmission, the terminal remains in the RRC Inactive state, and only restores the SDT related configuration, so that it can receive the data directly sent by the anchor base station or sent by the non-anchor base station according to the restored SDT related configuration
  • Small downlink data packets make the downlink small data transmission process more concise and efficient.
  • An embodiment of the present disclosure provides a data transmission method, which is applicable to the system as shown in FIG. 1 , and the system includes a terminal 11 , an anchor base station 12 , a non-anchor base station 13 , and a core network 14 .
  • the terminal 11 is in the RRC Inactive state.
  • the anchor base station 12 After receiving the small downlink data packet that the core network 14 needs to send to the terminal 11, the anchor base station 12 initiates an air interface paging to the terminal 11, and initiates a paging to the non-anchor base station 13 in the RNA area.
  • the non-anchor base station 13 initiates air interface paging to the terminal 11 according to the RAN paging message;
  • the air interface paging message and the RAN paging message include the instruction information of downlink small data transmission SDT;
  • the terminal 11 receives After paging to the air interface paging message, the SDT related configuration can be restored in the RRC Inactive state according to the preset SDT related configuration information, and the anchor base station 12 can send the downlink small data packet to the terminal directly or through the non-anchor base station 13 11.
  • the terminal 11 can receive the downlink small data packet according to the recovered SDT related configuration.
  • the applicable system may be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet Wireless business (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, Long term evolution advanced (LTE-A) system, universal mobile telecommunications system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G new air interface (New Radio, NR) system, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet Wireless business
  • long term evolution long term evolution
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • FDD frequency division duplex
  • TDD time division duplex
  • LTE-A Long term evolution advanced
  • the terminal device involved in the embodiments of the present disclosure may be a device that provides voice and/or data connectivity to users, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem.
  • the name of the terminal equipment may be different.
  • the terminal equipment may be called User Equipment (User Equipment, UE).
  • the wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via the radio access network (Radio Access Network, RAN), and the wireless terminal equipment can be a mobile terminal equipment, such as a mobile phone (or called a "cellular "telephones) and computers with mobile terminal equipment, such as portable, pocket, hand-held, computer built-in or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network.
  • a mobile terminal equipment such as a mobile phone (or called a "cellular "telephones) and computers with mobile terminal equipment, such as portable, pocket, hand-held, computer built-in or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network.
  • PCS Personal Communication Service
  • SIP Session Initiated Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • Wireless terminal equipment can also be called system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), and user device (user device), which are not limited in the embodiments of the present disclosure.
  • the base station involved in the embodiments of the present disclosure may also be other network devices, where the base station may include multiple cells that provide services for the terminal.
  • the base station can also be called an access point, or it can be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names.
  • the network device can be used to interchange received over-the-air frames with Internet Protocol (IP) packets and act as a router between the wireless terminal device and the rest of the access network, which can include the Internet Protocol (IP) communication network.
  • IP Internet Protocol
  • Network devices may also coordinate attribute management for the air interface.
  • the network equipment involved in the embodiments of the present disclosure may be a network equipment (Base Transceiver Station, BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA) ), it can also be a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or it can be an evolved network device in a long-term evolution (long term evolution, LTE) system (evolutional Node B, eNB or e-NodeB), 5G base station (gNB) in the 5G network architecture (next generation system), can also be a home evolved base station (Home evolved Node B, HeNB), relay node (relay node) , a home base station (femto), a pico base station (pico), etc., are not limited in this embodiment of the present disclosure.
  • a network device may include a centralized unit (centralized unit, CU) node and a distributed unit (distributed unit, DU) node
  • the method and the device are conceived based on the same application. Since the principle of solving problems of the method and the device is similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • FIG. 2 is a flow chart of the data transmission method provided by this embodiment. As shown in FIG. 2, this embodiment provides a data transmission method, and the execution subject is a terminal UE. The specific steps of the method are as follows:
  • S201 Receive an air interface paging message from the first base station to the terminal; wherein the air interface paging message includes downlink small data transmission SDT indication information; the terminal is in an RRC inactive state;
  • the first base station is an anchor base station or a non-anchor base station.
  • the anchor base station can receive the downlink small data packet sent to the terminal, and the downlink small data packet includes a downlink SDT ( Small Data Transmission (small data transmission) data or NAS signaling (for example, including NAS PDU), the anchor base station can initiate air interface paging to the terminal in its coverage area, and initiate RAN to the non-anchor base station in the RNA area Paging, RAN paging is to notify each non-anchor base station in the RNA area to initiate air interface paging to the terminal.
  • SDT Small Data Transmission (small data transmission) data or NAS signaling
  • RAN paging is to notify each non-anchor base station in the RNA area to initiate air interface paging to the terminal.
  • the downlink small data transmission SDT instruction information can be included in the air interface paging message and the RNA paging message , so that the terminal can know that there is a downlink small data packet to be sent to the terminal after receiving the air interface paging message.
  • the terminal if the terminal is within the coverage area of the anchor base station, it can receive the air interface paging message sent by the anchor base station; if the terminal is not within the coverage area of the anchor base station, In the coverage area, the air interface paging message sent by the non-anchor base station can be received.
  • the terminal after receiving the air interface paging message, the terminal knows that there is a downlink small data packet to be received, and can remain in the RRC Inactive state, and only restore the SDT related configuration according to the preset SDT related configuration information.
  • the preset SDT-related configuration information includes the configuration information provided by the anchor base station for SDT when the terminal enters the RRC Inactive state (that is, the configuration information for SDT in the terminal context information), or the preset SDT default configuration information.
  • the SDT-related configuration information is at least SDT DRB (Data Radio Bearer, data radio bearer) configuration.
  • the terminal restores the SDT-related configuration, it can initiate a Resume (resume) process to the first base station, that is, send an RRC recovery request RRCResumeRequest to the first base station, which may include mt-access (response paging) information, representing the terminal
  • RRC recovery request RRCResumeRequest may include mt-access (response paging) information, representing the terminal
  • the first base station is requested to restore the SDT-related radio bearer, and may initiate an access process for downlink small data packets.
  • the first base station can send the downlink small data packet to the terminal, and the terminal can receive the downlink small data packet sent by the first base station according to the restored SDT-related configuration.
  • the specific process is according to Whether the first base station is an anchor base station or a non-anchor base station requires different procedures.
  • the specific process of the anchor base station sending the downlink small data packet to the terminal is as follows:
  • the anchor base station After processing the downlink small data packet, the anchor base station directly sends the downlink small data packet to the terminal according to the terminal context information (including the terminal's SDT-related configuration information).
  • the downlink small data packet is processed, and the downlink small data packet is non-access layer NAS signaling, and the processing may include encapsulating the NAS signaling in an RRC message, and performing PDCP (Packet Data Convergence Protocol, packet data convergence protocol) Processing, and then at least one of the following processing: physical layer processing, MAC (Media Access Control, media access control) layer processing, RLC (Radio Link Control, radio link control) layer processing; and for downlink small data packets
  • the processing may include performing SDAP (Service Data Adaptation Protocol, Service Data Adaptation Protocol) processing and PDCP processing on the downlink SDT data, and then at least one of the following processing: physical layer processing, MAC layer processing, RLC layer processing.
  • the anchor base station can generate an RRC release message and send it to the terminal.
  • the terminal can stop receiving the downlink small data packet according to the RRC release message and enter the RRC Idle state. Or continue to maintain the RRC Inactive state (the SDT-related configuration can be released).
  • the anchor base station can also determine whether to use the above-mentioned SDT process to transmit the downlink small data packet, for example, determine whether the downlink small data packet meets the maximum data processing capacity of the anchor base station Capability, if satisfied, use the above SDT process to transmit the downlink small data packet; if not satisfied, determine not to use the above SDT process to transmit the downlink small data packet, then send the RRC recovery message to the terminal, so that the terminal can recover the message according to the RRC, Restore the full configuration in the RRC Inactive state to restore the RRC Inactive state to the RRC Connected state, and perform data reception in the RRC Connected state.
  • the specific process of the base station sending a downlink small data packet to the terminal is as follows:
  • the anchor base station sends the preset terminal context information to the non-anchor base station; in addition, the anchor base station can perform the first processing on the downlink small data packet, and then send the processed downlink small data packet to the non-anchor base station ; The non-anchor base station performs second processing on the downlink small data packet and sends it to the terminal according to the terminal context information.
  • the preset terminal context information is SDT related configuration information of the terminal; or the preset terminal context information may also be full amount of context information of the terminal, wherein the full amount of context information includes the SDT related configuration information of the terminal.
  • the SDT-related configuration information of the terminal includes at least SDT DRB-related RLC configuration.
  • the processing of downlink small data packets can be partly processed by the anchor base station (such as high-level processing), and another part of the processing (such as bottom-layer processing) can be performed by non-anchor base stations.
  • the anchor base station can encapsulate the NAS signaling in the RRC message, and perform PDCP processing, and then send it to the non-anchor base station for at least one of the following processing: physical layer processing, MAC layer processing, RLC layer processing
  • the anchor base station can perform SDAP processing and PDCP processing on the downlink SDT data, and then send it to the non-anchor base station for at least one of the following processing: physical layer processing, MAC layer processing Processing, RLC layer processing.
  • the anchor base station when the anchor base station sends the downlink small data packet to the non-anchor base station, if the downlink small data packet is downlink SDT data, it can receive the downlink SDT data forwarding tunnel information sent by the non-anchor base station, such as DL SDT DRB The corresponding Xn data forwarding channel information, and then the anchor base station sends the downlink small data packet to the non-anchor base station through the downlink SDT data forwarding tunnel; if the downlink small data packet is NAS signaling, the anchor base station can process it through the Xn interface The subsequent downlink small data packets are sent to the non-anchor base station.
  • the downlink small data packet is downlink SDT data
  • the anchor base station can process it through the Xn interface The subsequent downlink small data packets are sent to the non-anchor base station.
  • the non-anchor base station may send a terminal context information request message to the anchor base station, so that the anchor base station responds to the terminal context information request message and sends the terminal context information to to non-anchor base stations.
  • the maximum SDT data processing capability of the non-anchor base station can be carried in the terminal context information request message, and the anchor base station can judge whether the data volume of the downlink small data packet meets the maximum SDT data processing capability of the non-anchor base station, if satisfied , then it is determined to use the above SDT process to transmit small downlink data packets without anchor point transfer, which can further simplify the downlink small data transmission process and improve transmission efficiency; if not satisfied, then determine not to use the SDT process to transmit downlink small data packets.
  • the anchor base station processes all the downlink small data packets and sends them to the terminal, which can send RRC recovery messages to the terminal, so that the terminal restores the RRC Inactive state to the RRC Connected state for data reception, ensuring stable data transmission.
  • the anchor base station or the non-anchor base station determines that all downlink small data packets have been sent, it can generate an RRC release message and send it to the terminal by the non-anchor base station, The terminal can stop receiving downlink small data packets according to the RRC release message, and enter the RRC Idle state or RRC Inactive state (which can release SDT-related configurations).
  • the anchor base station for a terminal in the RRC Inactive state, after the anchor base station receives the downlink small data packet sent by the core network, it initiates air interface paging for the terminal, and the non-anchor base station in the RNA area Air interface paging for the terminal; the air interface paging message and the RAN paging message include downlink small data transmission SDT indication information; after the terminal receives the paging to air interface paging message, it can configure according to the preset SDT Information, restore SDT related configuration in RRC Inactive state, the anchor base station can send downlink small data packets to the terminal directly or through the non-anchor base station.
  • the terminal when performing downlink small data transmission, the terminal remains in the RRC Inactive state, and only restores the SDT related configuration, so that it can receive the data directly sent by the anchor base station or sent by the non-anchor base station according to the restored SDT related configuration
  • Small downlink data packets make the downlink small data transmission process more concise and efficient.
  • Example 1 The terminal responds to paging under the anchor base station
  • the anchor base station receives the downlink small data packet sent by the core network to the terminal in the RRC Inactive state;
  • the anchor base station initiates air interface paging for the terminal, and initiates RAN paging to the non-anchor base station in the notification area RNA based on the radio access network RAN;
  • the air interface paging message and the RAN paging message include downlink small data Transmission of SDT instruction information;
  • the terminal receives the air interface paging message sent by the anchor base station, and restores the SDT related configuration in the RRC Inactive state according to the preset SDT related configuration information.
  • the terminal sends an RRC recovery request to the anchor base station, including mt-access information, in response to the air interface paging;
  • the anchor base station processes the downlink small data packet
  • the processing may include encapsulating the NAS signaling in an RRC message, performing PDCP processing, and then performing at least one of the following processing: physical layer processing, MAC layer processing Processing, RLC layer processing; and for the downlink small data packet is downlink SDT data, the processing may include SDAP processing and PDCP processing on the downlink SDT data, and then at least one of the following processing: physical layer processing, MAC layer processing, RLC layer processing;
  • the anchor base station directly sends the downlink small data packet to the terminal according to the terminal context information
  • the terminal context information includes SDT-related configuration information of the terminal
  • the terminal receives the downlink small data packet sent by the anchor base station according to the recovered SDT related configuration.
  • Example 2 The terminal responds to paging under the non-anchor base station, and the anchor base station decides to use the SDT process to transmit small downlink data packets (without anchor transfer):
  • the anchor base station receives the downlink small data packet sent by the core network to the terminal in the RRC Inactive state;
  • the anchor base station initiates air interface paging for the terminal, and initiates RAN paging to the non-anchor base station in the notification area RNA based on the radio access network RAN;
  • the air interface paging message and the RAN paging message include downlink small data Transmission of SDT instruction information;
  • the terminal receives the air interface paging message sent by the non-anchor base station, and restores the SDT related configuration in the RRC Inactive state according to the preset SDT related configuration information.
  • the terminal sends an RRC recovery request to the non-anchor base station, including mt-access information, to respond to the air interface paging;
  • the non-anchor base station sends a terminal context information request message to the anchor base station;
  • the maximum SDT data processing capability of the non-anchor base station can be carried in the terminal context information request message, so that the anchor base station can judge whether the data volume of the downlink small data packet meets the maximum SDT data processing capability of the non-anchor base station;
  • the anchor base station determines to use the SDT process to transmit the downlink small data packet, and does not perform anchor transfer;
  • the anchor base station determines that the data volume of the downlink small data packet satisfies the maximum SDT data processing capability of the non-anchor base station, and determines that the above-mentioned SDT process is used to transmit the downlink small data packet without anchor transfer;
  • the anchor base station sends preset terminal context information to the non-anchor base station
  • the preset terminal context information is the SDT-related configuration information of the terminal; or the preset terminal context information may also be the full amount of context information of the terminal, wherein the full amount of context information includes the SDT-related configuration information of the terminal; optionally, the terminal
  • the SDT-related configuration information includes at least the SDT DRB-related RLC configuration
  • the non-anchor base station sends downlink SDT data forwarding tunnel information to the anchor base station;
  • the anchor base station performs first processing on the downlink small data packet
  • the processing may include SDAP processing and PDCP processing for the downlink SDT data; for the downlink small data packet is non-access stratum NAS signaling, the processing may include encapsulating the NAS signaling in In the RRC message, and perform PDCP processing,
  • the anchor base station sends the first processed downlink small data packet to the non-anchor base station;
  • the anchor base station sends the downlink small data packet to the non-anchor base station through the downlink SDT data forwarding tunnel allocated by the non-anchor base station; if the downlink small data packet is NAS signaling, the anchor base station The processed downlink small data packet can be sent to the non-anchor base station through the Xn interface;
  • the non-anchor base station performs second processing according to the downlink small data packet of the terminal context information
  • the second processing may include at least one of the following processing: physical layer processing, MAC layer processing, and RLC layer processing;
  • the non-anchor base station sends the downlink small data packet to the terminal according to the terminal context information
  • the terminal receives the downlink small data packet sent by the non-anchor base station according to the restored SDT related configuration.
  • Example 3 The terminal responds to paging under the non-anchor base station, and the anchor base station decides to perform normal pre-emptive data transmission (anchor transfer):
  • the anchor base station receives the downlink small data packet sent by the core network to the terminal in the RRC Inactive state;
  • the anchor base station initiates air interface paging for the terminal, and initiates RAN paging to the non-anchor base station in the notification area RNA based on the radio access network RAN;
  • the air interface paging message and the RAN paging message include downlink small data Transmission of SDT instruction information;
  • the terminal receives the air interface paging message sent by the non-anchor base station, and restores the SDT related configuration in the RRC Inactive state according to the preset SDT related configuration information.
  • the terminal sends an RRC recovery request to the non-anchor base station, including mt-access information, to respond to the air interface paging;
  • the non-anchor base station sends a terminal context information request message to the anchor base station;
  • the maximum SDT data processing capability of the non-anchor base station can be carried in the terminal context information request message, so that the anchor base station can judge whether the data volume of the downlink small data packet meets the maximum SDT data processing capability of the non-anchor base station;
  • the anchor base station determines to use normal advance data transmission to perform anchor transfer
  • the anchor base station determines that the data volume of the downlink small data packet does not meet the maximum SDT data processing capability of the non-anchor base station, and determines to use normal advanced data transmission to perform anchor transfer;
  • the anchor base station sends the full context information of the terminal and the downlink small data packet to the non-anchor base station;
  • the non-anchor base station converts to a new anchor base station according to the full amount of context information of the terminal, and sends the RRC recovery message to the terminal;
  • the terminal restores the RRC Inactive state to the RRC Connected state
  • the non-anchor base station processes the downlink small data packet
  • the processing may include encapsulating the NAS signaling in an RRC message, performing PDCP processing, and then performing at least one of the following processing: physical layer processing, MAC layer processing processing, RLC layer processing; and for the downlink small data packet is downlink SDT data, the processing may include SDAP processing and PDCP processing on the downlink SDT data, and then at least one of the following processing: physical layer processing, MAC layer processing, RLC layer processing;
  • the non-anchor base station sends the downlink small data packet to the terminal.
  • FIG. 6 is a flow chart of the data transmission method provided by this embodiment. As shown in Figure 6, this embodiment provides a data transmission method, the execution subject is the anchor base station, and the specific steps of the method are as follows:
  • the terminal responds to the air interface paging message of the anchor base station or the non-anchor base station, send the downlink small data packet to the terminal directly or through the non-anchor base station.
  • the directly sending the downlink small data packet to the terminal in S603 includes:
  • the downlink small data packet is sent to the terminal after the first processing and the second processing.
  • the sending of the downlink small data packet to the terminal through the non-anchor base station in S603 includes:
  • the terminal responds to the air interface paging message of the non-anchor base station, sending the terminal context information of the terminal to the non-anchor base station;
  • the processed downlink small data packet is sent to the non-anchor base station, so that the non-anchor base station can process all the received data packets according to the terminal context information
  • the processed downlink small data packet is subjected to the second processing and sent to the terminal.
  • the sending the terminal context information of the terminal to the non-anchor base station includes:
  • the terminal context information request message includes the maximum SDT data processing capability of the non-anchor base station
  • the sending the terminal context information of the terminal to the non-anchor base station in response to the terminal context information request message includes:
  • the SDT process is used to transmit the downlink small data packet, and send the terminal context information of the terminal to the non-anchor point base station.
  • the terminal context information is SDT-related configuration information of the terminal.
  • the terminal context information is full context information of the terminal, wherein the full context information includes SDT related configuration information of the terminal.
  • the base station sends the small downlink data packet to the terminal after performing the first processing and the second processing.
  • the second processing in the foregoing embodiments includes at least one of the following: processing at the physical layer, processing at the MAC layer, and processing at the RLC layer;
  • the first processing includes encapsulating the NAS signaling in an RRC message, and performing packet data convergence protocol PDCP processing; or,
  • the first processing includes performing service data adaptation protocol SDAP processing and PDCP processing on the downlink SDT data.
  • the sending the processed downlink small data packet to the non-anchor base station includes:
  • the downlink small data packet is downlink SDT data
  • the downlink small data packet is NAS signaling, send the processed downlink small data packet to the non-anchor base station through the Xn interface.
  • an RRC release message is generated and transmitted to the terminal, so that the terminal stops sending the downlink small data packet according to the RRC release message Receive, enter RRC Idle state or RRC Inactive state.
  • the data transmission method provided in this embodiment is the method on the anchor base station side in the above embodiments, and is based on the concept of the same application. Since the principles of the method and the device to solve the problem are similar, the repetitions will not be repeated.
  • FIG. 7 is a flow chart of the data transmission method provided by this embodiment. As shown in Figure 2, this embodiment provides a data transmission method, the execution subject is a non-anchor base station, and the specific steps of the method are as follows:
  • the acquiring the terminal context information of the terminal from the anchor base station in S703 includes:
  • the terminal context information request message includes the maximum data processing capability of the non-anchor base station
  • the receiving the terminal context information of the terminal sent by the anchor base station according to the terminal context information request message includes:
  • the anchor base station after sending the terminal context information request message to the anchor base station, it further includes:
  • the downlink small data packet is sent to the terminal after performing the first processing and the second processing according to the full amount of context information of the terminal.
  • the acquisition of the first processed downlink small data packet from the anchor base station in S704 includes:
  • the downlink small data packet is downlink SDT data
  • allocate a downlink SDT data forwarding tunnel to the downlink SDT data and send downlink SDT data forwarding tunnel information to the anchor base station;
  • the downlink small data packet is NAS signaling, receiving the first processed downlink small data packet sent by the anchor base station through the Xn interface.
  • the data transmission method provided in this embodiment is the method on the side of the non-anchor base station in the above embodiment, and is based on the idea of the same application. Since the principles of the method and the device to solve the problem are similar, the repetitive parts will not be repeated.
  • FIG. 8 is a structural diagram of a terminal according to an embodiment of the present disclosure.
  • the terminal provided in this embodiment can execute the processing flow provided by the method embodiment on the terminal side.
  • the terminal 810 includes a memory 811 , a transceiver 812 , and a processor 813 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 813 and various circuits of the memory represented by the memory 811 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein.
  • the bus interface provides the interface.
  • Transceiver 812 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the processor 813 is responsible for managing the bus architecture and general processing, and the memory 811 can store data used by the processor 813 when performing operations.
  • the processor 813 can be a central processing device (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device , CPLD), the processor can also adopt a multi-core architecture.
  • CPU central processing device
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • CPLD Complex Programmable Logic Device
  • the memory 811 is used to store computer programs; the transceiver 812 is used to send and receive data under the control of the processor 813; the processor 813 is used to read the computer programs in the memory 811 and perform the following operations:
  • the terminal Receiving an air interface paging message from the first base station to the terminal, wherein the air interface paging message includes downlink small data transmission SDT indication information; the terminal is in the radio resource control RRC inactive Inactive state; the first base station Be an anchor base station or a non-anchor base station;
  • the recovered SDT related configuration receive the downlink small data packet sent by the first base station.
  • the processor 813 restores the SDT-related configuration in the RRC Inactive state according to the preset SDT-related configuration information, it is used to:
  • the preset SDT-related radio bearer configuration information restore the configuration of the SDT-related radio bearer, and send an RRC recovery request message to the first base station, so as to request the first base station to restore the SDT-related radio bearer.
  • the preset SDT-related configuration information includes configuration information provided by the anchor base station for SDT when the terminal enters the RRC Inactive state, or preset SDT default configuration information.
  • the small downlink data packet includes downlink SDT data or non-access stratum NAS signaling.
  • the processor 813 restores the SDT related configuration in the RRC Inactive state, it is also used for:
  • the terminal state is restored from the RRC Inactive state to the RRC connection Connected state.
  • the processor 813 restores the SDT related configuration in the RRC Inactive state, it is also used for:
  • the terminal provided by the embodiments of the present disclosure may be specifically used to execute the above-mentioned method embodiments on the terminal side, and specific functions will not be repeated here.
  • FIG. 9 is a structural diagram of an anchor base station provided by an embodiment of the present disclosure.
  • the base station provided in this embodiment can execute the processing flow provided by the method embodiment on the base station side.
  • the base station 820 includes a memory 821 , a transceiver 822 , and a processor 823 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 823 and various circuits of the memory represented by the memory 821 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein.
  • the bus interface provides the interface.
  • the transceiver 822 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the processor 823 is responsible for managing the bus architecture and general processing, and the memory 821 can store data used by the processor 823 when performing operations.
  • the processor 823 can be a central processing device (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device , CPLD), the processor can also adopt a multi-core architecture.
  • CPU central processing device
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • CPLD Complex Programmable Logic Device
  • the memory 821 is used to store computer programs; the transceiver 822 is used to send and receive data under the control of the processor 823; the processor 823 is used to read the computer programs in the memory 821 and perform the following operations:
  • the terminal sends an air interface paging message; wherein, the RAN paging message, and the air interface paging message of the anchor base station and the non-anchor base station include downlink small data transmission SDT indication information;
  • the downlink small data packet is sent to the terminal directly or through the non-anchor base station.
  • the processor 823 when the processor 823 sends the downlink small data packet to the terminal through the non-anchor base station, it is configured to:
  • the terminal responds to the air interface paging message of the non-anchor base station, sending the terminal context information of the terminal to the non-anchor base station;
  • the processed downlink small data packet is sent to the non-anchor base station, so that the non-anchor base station can process all the received data packets according to the terminal context information
  • the processed downlink small data packet is subjected to the second processing and sent to the terminal.
  • the processor 823 when the processor 823 directly sends the downlink small data packet to the terminal, it is configured to:
  • the downlink small data packet is sent to the terminal after the first processing and the second processing.
  • the processor 823 when the processor 823 sends the terminal context information of the terminal to the non-anchor base station, it is configured to:
  • the terminal context information request message includes the maximum SDT data processing capability of the non-anchor base station
  • the processor 823 sends the terminal context information to the non-anchor base station in response to the terminal context information request message, it is configured to:
  • the non-anchor base station determines to use the SDT process to transmit the downlink small data packet, and send the context information of the terminal to the non-anchor base station .
  • the terminal context information is SDT-related configuration information of the terminal.
  • the terminal context information is the full amount of context information of the terminal, wherein the full amount of context information includes the SDT related configuration information of the terminal.
  • the processor 823 is further configured to:
  • the SDT process is not used to transmit the downlink small data packet, and the full amount of terminal context information of the terminal and the downlink small data packet
  • the data packet is sent to the non-anchor base station for anchor transfer, that is, the non-anchor base station is converted to a new anchor base station according to the full amount of terminal context information of the terminal to perform the first downlink small data packet processed and sent to the terminal after the second processing.
  • the second processing includes at least one of the following: processing at the physical layer, processing at the MAC layer, and processing at the RLC layer;
  • the first processing includes encapsulating the NAS signaling in an RRC message, and performing packet data convergence protocol PDCP processing; or,
  • the first processing includes performing service data adaptation protocol SDAP processing and PDCP processing on the downlink SDT data.
  • the processor 823 when the processor 823 sends the processed downlink small data packet to the non-anchor base station, it is configured to:
  • downlink small data packet is downlink SDT data, receiving downlink SDT data forwarding tunnel information sent by the non-anchor base station;
  • the downlink small data packet is NAS signaling, send the processed downlink small data packet to the non-anchor base station through the Xn interface.
  • the processor 823 is further configured to:
  • an RRC release message is generated and transmitted to the terminal, so that the terminal stops receiving the downlink small data packet according to the RRC release message, and enters the RRC Idle state or the RRC Inactive state .
  • the anchor base station provided by the embodiments of the present disclosure may be specifically used to execute the above-mentioned method embodiment on the anchor base station side, and the specific functions will not be repeated here.
  • FIG. 10 is a structural diagram of a non-anchor base station provided by an embodiment of the present disclosure.
  • the non-anchor base station provided in this embodiment can execute the processing flow provided by the method embodiment on the side of the non-anchor base station.
  • the non-anchor base station 830 includes a memory 831 , a transceiver 832 , and a processor 833 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 833 and various circuits of the memory represented by the memory 831 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein.
  • the bus interface provides the interface.
  • Transceiver 832 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the processor 833 is responsible for managing the bus architecture and general processing, and the memory 831 can store data used by the processor 833 when performing operations.
  • the processor 833 can be a central processing device (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device , CPLD), the processor can also adopt a multi-core architecture.
  • CPU central processing device
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • CPLD Complex Programmable Logic Device
  • the memory 831 is used to store computer programs; the transceiver 832 is used to send and receive data under the control of the processor 833; the processor 833 is used to read the computer programs in the memory 831 and perform the following operations:
  • radio access network RAN paging information sent by the anchor base station where the RAN paging information is sent by the anchor base station to non-anchor base stations in the RNA area;
  • the RAN paging message and the air interface paging message include downlink small data transmission SDT indication information; the terminal is in the RRC Inactive state;
  • the terminal If it is determined that the terminal responds to the air interface paging message of the non-anchor base station, acquiring terminal context information of the terminal from the anchor base station;
  • the processor 833 acquires the terminal context information of the terminal from the anchor base station, it is configured to:
  • the terminal context information request message includes the maximum data processing capability of the non-anchor base station
  • the processor 833 When receiving the terminal context information of the terminal sent by the anchor base station according to the terminal context information request message, the processor 833 is configured to:
  • the processor 833 after the processor 833 sends the terminal context information request message to the anchor base station, it is further configured to:
  • the downlink small data packet is sent to the terminal after performing the first processing and the second processing according to the full amount of context information of the terminal.
  • the processor 833 when the processor 833 obtains the first-processed downlink small data packet from the anchor base station, it is configured to:
  • the downlink small data packet is downlink SDT data
  • allocate a downlink SDT data forwarding tunnel to the downlink SDT data and send downlink SDT data forwarding tunnel information to the anchor base station;
  • the downlink small data packet is NAS signaling, receiving the first processed downlink small data packet sent by the anchor base station through the Xn interface.
  • the non-anchor base station provided by the embodiments of the present disclosure may be specifically used to execute the above method embodiment on the side of the non-anchor base station, and specific functions will not be repeated here.
  • FIG. 11 is a structural diagram of a terminal provided by an embodiment of the present disclosure.
  • the terminal provided in this embodiment can execute the processing flow provided by the method embodiment on the terminal side.
  • the terminal 910 includes a receiving unit 911 and a processing unit 912 .
  • the receiving unit 911 is configured to receive an air interface paging message from the first base station to the terminal, wherein the air interface paging message includes downlink small data transmission SDT indication information; the terminal is in the radio resource control RRC inactive state ;
  • the first base station is an anchor base station or a non-anchor base station;
  • the processing unit 912 is configured to restore the SDT related configuration in the RRC Inactive state according to the indication information of the downlink SDT in the air interface paging message;
  • the receiving unit 911 is further configured to receive the downlink small data packet sent by the first base station according to the recovered SDT related configuration.
  • the processing unit 912 restores the SDT related configuration in the RRC Inactive state according to the preset SDT related configuration information, it is used to:
  • the preset SDT-related configuration information includes configuration information provided by the anchor base station for SDT when the terminal enters the RRC Inactive state, or preset SDT default configuration information.
  • the small downlink data packet includes downlink SDT data or non-access stratum NAS signaling.
  • the receiving unit 911 is further configured to receive an RRC recovery message sent by the first base station;
  • the processing unit 912 is further configured to restore the terminal state from the RRC Inactive state to the RRC Connected state according to the RRC recovery message.
  • the receiving unit 911 is further configured to receive an RRC release message sent by the first base station;
  • the processing unit 912 is further configured to, according to the RRC release message, stop receiving the SDT downlink small data packet, enter the RRC idle state or maintain the RRC Inactive state.
  • the terminal provided by the embodiments of the present disclosure may be specifically used to execute the above-mentioned method embodiments on the terminal side, and specific functions will not be repeated here.
  • FIG. 12 is a structural diagram of an anchor base station provided by an embodiment of the present disclosure.
  • the anchor base station provided in this embodiment can execute the processing flow provided by the method embodiment on the anchor base station side.
  • the anchor base station 920 includes a receiving unit 921 , a paging unit 922 , and a sending unit 923 .
  • the receiving unit 921 is used to receive the downlink small data packet sent by the core network to the terminal in the RRC Inactive state;
  • the paging unit 922 is configured to send an air interface paging message to the terminal, and/or send a RAN paging message to a non-anchor base station in a notification area RNA based on the radio access network RAN, so that the non-anchor base station Send an air interface paging message to the terminal according to the RAN paging message; wherein, the RAN paging message, and the air interface paging message of the anchor base station and the non-anchor base station include downlink small data transmission SDT indication information;
  • the sending unit 923 is configured to send the downlink small data packet to the terminal directly or through the non-anchor base station if it is determined that the terminal responds to the air interface paging message of the anchor base station or the non-anchor base station.
  • the sending unit 923 when the sending unit 923 sends the downlink small data packet to the terminal through the non-anchor base station, it is configured to:
  • the terminal responds to the air interface paging message of the non-anchor base station, sending the terminal context information of the terminal to the non-anchor base station;
  • the processed downlink small data packet is sent to the non-anchor base station, so that the non-anchor base station can process all the received data packets according to the terminal context information
  • the processed downlink small data packet is subjected to the second processing and sent to the terminal.
  • the sending unit 923 directly sends the downlink small data packet to the terminal, it is used to:
  • the downlink small data packet is sent to the terminal after the first processing and the second processing.
  • the receiving unit 921 when sending the terminal context information of the terminal to the non-anchor base station, the receiving unit 921 receives a terminal context information request message sent by the non-anchor base station;
  • the sending unit 923 sends the terminal context information of the terminal to the non-anchor base station in response to the terminal context information request message.
  • the terminal context information request message includes the maximum SDT data processing capability of the non-anchor base station
  • the sending unit 923 sends the terminal context information of the terminal to the non-anchor base station in response to the terminal context information request message, it is configured to:
  • the SDT process is used to transmit the downlink small data packet, and send the terminal context information of the terminal to the non-anchor point base station.
  • the terminal context information is SDT-related configuration information of the terminal.
  • the terminal context information is full context information of the terminal, wherein the full context information includes SDT related configuration information of the terminal.
  • the sending Unit 923 sends the full amount of terminal context information and downlink small data packets of the terminal to the non-anchor base station for anchor transfer, that is, the non-anchor base station uses the full amount of terminal context information of the terminal.
  • the information conversion is that the new anchor base station performs the first processing and the second processing on the downlink small data packet and sends it to the terminal.
  • the second processing includes at least one of the following: processing at the physical layer, processing at the MAC layer, and processing at the RLC layer;
  • the first processing includes encapsulating the NAS signaling in an RRC message, and performing packet data convergence protocol PDCP processing; or,
  • the first processing includes performing service data adaptation protocol SDAP processing and PDCP processing on the downlink SDT data.
  • the sending unit 923 when the sending unit 923 sends the processed downlink small data packet to the non-anchor base station, it is configured to:
  • downlink small data packet is downlink SDT data, receiving downlink SDT data forwarding tunnel information sent by the non-anchor base station;
  • the downlink small data packet is NAS signaling, send the processed downlink small data packet to the non-anchor base station through the Xn interface.
  • the sending unit 923 is further configured to, after determining that the downlink small data packet is sent, generate an RRC release message and transmit it to the terminal, so that the terminal can Release the message, stop receiving downlink small data packets, and enter the RRC Idle state or RRC Inactive state.
  • the anchor base station provided by the embodiments of the present disclosure may be specifically used to execute the above-mentioned method embodiment on the anchor base station side, and the specific functions will not be repeated here.
  • FIG. 13 is a structural diagram of a non-anchor base station provided by an embodiment of the present disclosure.
  • the data transmission device provided in this embodiment can execute the processing flow provided by the method embodiment on the non-anchor base station side. As shown in FIG. Receiving unit 934.
  • the receiving unit 934 is configured to receive radio access network RAN paging information sent by the anchor base station, where the RAN paging information is sent by the anchor base station to non-anchor base stations in the RNA area;
  • the paging unit 931 is configured to initiate air interface paging for the terminal according to the RAN paging message of the anchor base station; wherein, the RAN paging message and the air interface paging message include downlink small data transmission SDT indication information; the The terminal is in the RRC Inactive state;
  • the obtaining unit 932 is configured to obtain the terminal context information of the terminal from the anchor base station if it is determined that the terminal responds to the air interface paging message of the non-anchor base station; The processed downlink small data packet;
  • the sending unit 933 is configured to perform second processing on the downlink small data packet according to the terminal context information, and send it to the terminal.
  • the obtaining unit 932 obtains the terminal context information of the terminal from the anchor base station, it is configured to:
  • the terminal context information request message includes the maximum data processing capability of the non-anchor base station
  • the acquiring unit 932 When receiving the terminal context information of the terminal sent by the anchor base station according to the terminal context information request message, the acquiring unit 932 is configured to:
  • the acquiring unit 932 after the acquiring unit 932 sends the terminal context information request message to the anchor base station, it is further configured to receive the data of the downlink small data packet determined by the anchor base station The full amount of context information and downlink small data packets of the terminal sent after the amount does not meet the maximum data processing capability of the non-anchor base station;
  • the sending unit 933 is also configured to switch to a new anchor base station according to the full amount of context information of the terminal, and send an RRC recovery message to the terminal, so that the terminal restores the RRC Inactive state to the RRC Connected state;
  • the full amount of context information of the terminal is sent to the terminal after the first processing and the second processing are performed on the downlink small data packet.
  • the obtaining unit 932 obtains the first-processed downlink small data packet from the anchor base station, it is configured to:
  • the downlink small data packet is downlink SDT data
  • allocate a downlink SDT data forwarding tunnel to the downlink SDT data and send downlink SDT data forwarding tunnel information to the anchor base station;
  • the downlink small data packet is NAS signaling, receiving the first processed downlink small data packet sent by the anchor base station through the Xn interface.
  • the data transmission device provided by the embodiments of the present disclosure may be specifically used to execute the method embodiments on the base station side described above, and the specific functions will not be repeated here.
  • each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a processor-readable storage medium.
  • the technical solution of the present disclosure is essentially or part of the contribution to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the methods described in various embodiments of the present disclosure.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disc and other media that can store program codes. .
  • Another embodiment of the present disclosure further provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and the computer program is used to enable a processor to execute a data transmission method on the side of a terminal or an anchor base station or a non-anchor base station.
  • the computer-readable storage medium may be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (such as CD , DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc.
  • magnetic storage such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.
  • optical storage such as CD , DVD, BD, HVD, etc.
  • semiconductor memory such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)
  • Another embodiment of the present disclosure further provides a computer program product, including a computer program, and the computer program is used to cause a processor to execute a data transmission method on the side of a terminal or an anchor base station or a non-anchor base station.
  • the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Accordingly, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) having computer-usable program code embodied therein.
  • processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the processor-readable memory produce a manufacturing product, the instruction device realizes the functions specified in one or more procedures of the flow chart and/or one or more blocks of the block diagram.
  • processor-executable instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented
  • the executed instructions provide steps for implementing the functions specified in the procedure or procedures of the flowchart and/or the block or blocks of the block diagrams.

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Abstract

本公开提供一种数据传输方法、装置及存储介质，锚点基站接收到核心网向RRC Inactive状态的终端发送的下行小数据包后发起对终端的空口寻呼、及在RNA中向非锚点基站发起RAN寻呼；在空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；终端接收到寻呼到空口寻呼消息后，在RRC Inactive状态下恢复SDT相关配置，锚点基站直接或通过非锚点基站将下行小数据包发送给终端。在进行下行小数据传输时终端保持在RRC Inactive状态，仅恢复SDT相关配置，这样可根据恢复的SDT相关配置接收锚点基站直接发送的或通过非锚点基站发送的下行小数据包，使得下行小数据传输过程更加简洁高效。

Description

数据传输方法、装置及存储介质
本公开要求于2021年10月22日提交中国专利局、申请号为202111236396.6、申请名称为“数据传输方法、装置及存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及通信技术领域，尤其涉及一种数据传输方法、装置及存储介质。
背景技术
第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)对于下一代(例如第五代，5G)无线通信网络在无线资源控制(Radio Resource Control，RRC)连接状态(RRC Connected)和空闲状态(RRC Idle)的基础上，提出了一种新的RRC状态：RRC非激活(RRC Inactive)状态。RRC Inactive状态的目标是要达到省电以及可接受的接入延迟。
当用户设备(User Equipment，UE)在RRC Inactive状态时，从核心网来看，UE仍处于CM_Connected状态(非接入层状态)，无线接入网(Radio Access Network，RAN)和UE都保留了UE的接入层的上下文，但UE的空口资源已释放，与RRC Idle状态类似，UE可以在RRC Inactive状态下进行小区重选、接收广播的系统信息和寻呼消息，区别是UE可以快速恢复到连接状态。
现有技术中，对于RRC Inactive状态的UE，若需要进行上下行数据包的传输，需要UE先由RRC Inactive状态恢复到RRC Connected状态，在RRC Connected状态下进行上下行数据包的传输。
现有技术中针对少许的下行小数据包或非接触层(Non-access Stratum，NAS)消息的传输，也需要将RRC Inactive状态恢复到RRC Connected状态；此外，若UE不在锚点基站下，还需要进行锚点转移以及路径转换。目前的传输过程过于繁琐，效率也低。
发明内容
本公开提供一种数据传输方法、装置及存储介质，以使得RRC Inactive状态的终端进行下行小数据传输的过程更加简洁高效。
第一方面，本公开提供一种数据传输方法，应用于终端，该方法包括：
接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据 传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态，所述第一基站为锚点基站或非锚点基站；
根据所述空口寻呼消息中包含的所述下行SDT的指示信息，在所述RRC Inactive状态下恢复SDT相关配置；
根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
在一种可能的设计中，所述在RRC Inactive状态下恢复SDT相关配置，包括：
根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，所述RRC恢复请求消息用于请求所述第一基站恢复SDT相关无线承载。
在一种可能的设计中，所述预设的SDT相关配置信息包括所述终端进入RRC Inactive状态时锚点基站针对SDT提供的配置信息、或者预设的SDT默认配置信息。
在一种可能的设计中，所述下行小数据包包括下行SDT数据或者非接入层NAS信令。
在一种可能的设计中，所述在RRC Inactive状态下恢复SDT相关配置后，还包括：
接收所述第一基站发送的RRC恢复消息；
根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected状态。
在一种可能的设计中，所述在RRC Inactive状态下恢复SDT相关配置后，还包括：
接收所述第一基站发送的RRC释放消息；
根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
第二方面，本公开提供一种数据传输方法，应用于锚点基站，该方法包括：
接收核心网向RRC Inactive状态的终端发送的下行小数据包；
向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，所述RAN寻呼消息用于指示所述非锚点基站向所述终端发送空口寻呼消息；其中，所述RAN寻呼消息以及所述空口寻呼消息中包括下行小数据传输SDT的指示信息；
若确定所述终端响应所述空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
在一种可能的设计中，所述通过非锚点基站将下行小数据包发送给所述终端，包括：
若确定所述终端响应非锚点基站发送的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以使所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
在一种可能的设计中，所述直接将下行小数据包发送给所述终端，包括：
若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
在一种可能的设计中，所述将所述终端的终端上下文信息发送给所述非锚点基站，包括：
接收所述非锚点基站发送的终端上下文信息请求消息；
响应于所述终端上下文信息请求消息，将所述终端上下文信息发送给所述非锚点基站。
在一种可能的设计中，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
所述响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站，包括：
若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的终端上下文信息发送给所述非锚点基站；其中所述终端上下文信息中包含所述终端的SDT相关配置信息。
在一种可能的设计中，所述终端上下文信息为所述终端的SDT相关配置信息；或者，
所述终端上下文信息为所述终端的全量上下文信息，其中全量上下文信息中包括所述终端的SDT相关配置信息。
在一种可能的设计中，所述方法还包括：
若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移。
在一种可能的设计中，若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，
若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理；
在一种可能的设计中，所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理。
在一种可能的设计中，所述将处理后的下行小数据包发送给所述非锚点基站，包括：
若下行小数据包为下行SDT数据，则通过所述非锚点基站分配的下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
在一种可能的设计中，所述方法还包括：
在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态或者RRC Inactive状态。
第三方面，本公开提供一种数据传输方法，应用于非锚点基站，该方法包括：
接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼，其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息，所述终端处于RRC Inactive状态；
若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；
从所述锚点基站获取经过第一处理的下行小数据包；
根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
在一种可能的设计中，所述从所述锚点基站获取所述终端的终端上下文信息，包括：
向所述锚点基站发送终端上下文信息请求消息；
接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
在一种可能的设计中，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
所述接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息，包括：
接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力后发送的所述终端的终端上下文信息。
在一种可能的设计中，所述向所述锚点基站发送终端上下文信息请求消息后，还包括：
接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量的终端上下文信息以及下行小数据包；
根据所述终端的全量的终端上下文信息转换为新锚点基站，并向所述终端发送RRC 恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；
根据所述终端的全量的终端上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
在一种可能的设计中，所述从所述锚点基站获取经过第一处理的下行小数据包，包括：
若下行小数据包为下行SDT数据，对下行SDT数据分配下行SDT数据转发隧道，并将下行SDT数据转发隧道信息发送给所述锚点基站；
接收所述锚点基站通过所述下行SDT数据转发隧道发送的经过第一处理的下行小数据包；或者
若下行小数据包为NAS信令，则接收所述锚点基站通过Xn接口发送的经过第一处理的下行小数据包。
第四方面，本公开提供一种终端，包括存储器，收发机，处理器：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态，所述第一基站为锚点基站或非锚点基站；
根据所述空口寻呼消息中包含的所述下行SDT的指示信息，在所述RRC Inactive状态下恢复SDT相关配置；
根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
在一种可能的设计中，所述处理器在根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置时，用于：
根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，所述RRC恢复请求消息用于请求所述第一基站恢复SDT相关无线承载。
在一种可能的设计中，所述预设的SDT相关配置信息包括所述终端进入RRC Inactive状态时锚点基站针对SDT提供的配置信息、或者预设的SDT默认配置信息。
在一种可能的设计中，所述下行小数据包包括下行SDT数据或者非接入层NAS信令。
在一种可能的设计中，所述处理器在RRC Inactive状态下恢复SDT相关配置后，还用于：
接收所述第一基站发送的RRC恢复消息；
根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected 状态。
在一种可能的设计中，所述处理器在RRC Inactive状态下恢复SDT相关配置后，还用于：
接收所述第一基站发送的RRC释放消息；
根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
第五方面，本公开提供一种锚点基站，包括存储器，收发机，处理器：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
接收核心网向RRC Inactive状态的终端发送的下行小数据包；
向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，所述RAN寻呼消息用于指示所述非锚点基站向所述终端发送空口寻呼消息；其中，所述RAN寻呼消息以及所述空口寻呼消息中包括下行小数据传输SDT的指示信息；
若确定所述终端响应所述空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
在一种可能的设计中，所述处理器在通过非锚点基站将下行小数据包发送给所述终端时，用于：
若确定所述终端响应非锚点基站发送的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以使所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
在一种可能的设计中，所述处理器在直接将下行小数据包发送给所述终端时，用于：
若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
在一种可能的设计中，所述处理器在将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
接收所述非锚点基站发送的终端上下文信息请求消息；
响应于所述终端上下文信息请求消息，将所述终端上下文信息发送给所述非锚点基站。
在一种可能的设计中，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT 数据处理能力；
所述处理器在响应于所述终端上下文信息请求消息，将所述终端上下文信息发送给所述非锚点基站时，用于：
若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端上下文信息发送给所述非锚点基站。
在一种可能的设计中，所述终端上下文信息为所述终端的SDT相关配置信息；或者，
所述终端上下文信息为所述终端的全量上下文信息，其中全量上下文信息中包括所述终端的SDT相关配置信息。
在一种可能的设计中，所述处理器还用于：
若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移。
在一种可能的设计中，所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理；
若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，
若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理。
在一种可能的设计中，所述处理器在将处理后的下行小数据包发送给所述非锚点基站时，用于：
若下行小数据包为下行SDT数据，则通过所述非锚点基站分配的下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
在一种可能的设计中，所述处理器还用于：
在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态或者RRC Inactive状态。
第六方面，本公开提供一种非锚点基站，包括存储器，收发机，处理器：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼，其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息，所述终端处于RRC Inactive状态；
若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；
从所述锚点基站获取经过第一处理的下行小数据包；
根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
在一种可能的设计中，所述处理器在从所述锚点基站获取所述终端的终端上下文信息时，用于：
向所述锚点基站发送终端上下文信息请求消息；
接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
在一种可能的设计中，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
所述处理器在接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息时，用于：
接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力后发送的所述终端的终端上下文信息。
在一种可能的设计中，所述处理器在向所述锚点基站发送终端上下文信息请求消息后，还用于：
接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
根据所述终端的全量上下文信息转换为新锚点基站，并向所述终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；
根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
在一种可能的设计中，所述处理器在从所述锚点基站获取经过第一处理的下行小数据包时，用于：
若下行小数据包为下行SDT数据，对下行SDT数据分配下行SDT数据转发隧道，并将下行SDT数据转发隧道信息发送给所述锚点基站；
接收所述锚点基站通过所述下行SDT数据转发隧道发送的经过第一处理的下行小数据包；或者
若下行小数据包为NAS信令，则接收所述锚点基站通过Xn接口发送的经过第一处理的下行小数据包。
第七方面，本公开提供一种终端，包括：
接收单元，用于接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态，所述第一基站为锚点基站或非锚点基站；
处理单元，用于根据所述空口寻呼消息中包含的所述下行SDT的指示信息，在所述RRC Inactive状态下恢复SDT相关配置；
所述接收单元还用于，根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
第八方面，本公开提供一种锚点基站，包括：
接收单元，用于接收核心网向RRC Inactive状态的终端发送的下行小数据包；
寻呼单元，用于向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，所述RAN寻呼消息用于指示所述非锚点基站向所述终端发送空口寻呼消息；其中，所述RAN寻呼消息以及所述空口寻呼消息中包括下行小数据传输SDT的指示信息；
发送单元，用于若确定所述终端响应所述空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
第九方面，本公开提供一种非锚点基站，包括：
接收单元，用于接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
寻呼单元，用于根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼，其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息，所述终端处于RRC Inactive状态；
获取单元，用于若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；从所述锚点基站获取经过第一处理的下行小数据包；
发送单元，用于根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
第十方面，本公开提供一种处理器可读存储介质，所述处理器可读存储介质存储有计 算机程序，所述计算机程序用于使所述处理器执行第一方面、第二方面或第三方面所述的方法。
本公开提供一种数据传输方法、装置及存储介质，锚点基站接收到核心网向RRC Inactive状态的终端发送的下行小数据包后，发起对终端的空口寻呼、以及在RNA中向非锚点基站发起RAN寻呼；在空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；终端接收到寻呼到空口寻呼消息后，可根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置，锚点基站可直接或通过非锚点基站将下行小数据包发送给终端。本公开的数据传输方法在进行下行小数据传输时，终端保持在RRC Inactive状态，仅恢复SDT相关配置，这样可根据恢复的SDT相关配置接收锚点基站直接发送的或通过非锚点基站发送的下行小数据包，使得下行小数据传输过程更加简洁高效。
应当理解，上述发明内容部分中所描述的内容并非旨在限定本公开的实施例的关键或重要特征，亦非用于限制本公开的范围。本公开的其它特征将通过以下的描述变得容易理解。
附图说明
为了更清楚地说明本公开或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本公开一实施例提供的数据传输方法的系统示意图；
图2为本公开一实施例提供的数据传输方法的流程图；
图3为本公开一实施例提供的数据传输方法的信令图；
图4为本公开另一实施例提供的数据传输方法的信令图；
图5为本公开另一实施例提供的数据传输方法的信令图；
图6为本公开另一实施例提供的数据传输方法的流程图；
图7为本公开另一实施例提供的数据传输方法的流程图；
图8为本公开一实施例提供的终端的结构图；
图9为本公开一实施例提供的锚点基站的结构图；
图10为本公开一实施例提供的非锚点基站的结构图；
图11为本公开另一实施例提供的终端的结构图；
图12为本公开另一实施例提供的锚点基站的结构图；
图13为本公开另一实施例提供的非锚点基站的结构图。
具体实施方式
本公开中术语“和/或”，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。字符“/”一般表示前后关联对象是一种“或”的关系。
本公开实施例中术语“多个”是指两个或两个以上，其它量词与之类似。
3GPP对于下一代(例如第五代，5G)无线通信网络在RRC Connected状态和RRC Idle状态的基础上，提出了一种新的RRC状态：RRC Inactive状态。RRC Inactive状态的目标是要达到省电以及可接受的接入延迟。当UE在RRC Inactive状态时，从核心网来看，UE仍处于CM_Connected状态(非接入层状态)，RAN和UE都保留了UE的接入层的上下文，但UE的空口资源已释放，与RRC Idle状态类似，UE可以在RRC Inactive状态下进行小区重选、以及接收系统信息广播和寻呼消息，区别是UE可以快速恢复到连接状态。
现有技术中，对于RRC Inactive状态的UE，若需要进行上下行数据包的传输，需要UE先将RRC Inactive状态恢复到RRC Connected状态，在RRC Connected状态下进行上下行数据包的传输。
其中，锚点基站是终端进入RRC Inactive状态前(最后一个服务基站)进行RRC连接的基站，终端进入RRC Inactive状态后，锚点基站仍保持与核心网的连接，也即从核心网来看，UE仍处于CM_Connected状态(非接入层状态)，此时锚点基站和终端均保留了RRC连接时的终端上下文信息，终端不与锚点基站连接，空口资源已释放，与RRC Idle状态类似，但终端可以在RRC Inactive状态下进行小区重选、以及接收系统信息广播和寻呼消息，并且终端只要在锚点基站覆盖区域内，锚点基站可通过对终端的空口寻呼就可以快速恢复到RRC Connected状态，恢复终端与锚点基站的RRC连接；而若终端移出锚点基站的覆盖区域，但未移出基于RAN(Radio Access Network，无线接入网)的通知区域(RAN Notification Area，RNA)，终端在RNA区域内移动可以不用执行核心网跟踪区域更新，锚点基站可以在RNA区域内发起RAN寻呼，也即通知RNA区域内的非锚点基站发起空口寻呼，若终端在RNA区域内的任一非锚点基站响应了寻呼，则锚点基站可将终端的上下文发送给非锚点基站，进行锚点转移和路径转换，由非锚点基站作为新的锚点基站，建立与终端的RRC连接以及与核心网的连接。
然而，在RRC Inactive状态是否可以进行小数据传输以及如何进行小数据传输，在5G NR初期进行了一些讨论，主要是在空口的数据传输方法方面，但没有明确的方案，基站 侧如何处理小数据传输尚没有明确的方案。正常的RRC Inactive状态下，终端的上行数据或下行数据到达，都会触发终端从RRC Inactive状态切换到RRC Connected状态，在RRC Connected状态完成数据的发送。
然而，对于少许的下行小数据包或NAS消息的传输，将RRC Inactive状态恢复到RRC Connected状态，并且若UE不在锚点基站下还需进行锚点转移以及路径转换，导致下行小数据包或NAS消息的传输过程过于繁琐，效率很低。
为了解决上述技术问题，本公开提供了一种数据传输方法，锚点基站接收到核心网向某一RRC Inactive状态的终端发送的下行小数据包后，发起对该终端的空口寻呼、以及在RNA中向非锚点基站发起RAN寻呼，使得非锚点基站根据RAN寻呼消息发起对该终端的空口寻呼；在空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；终端接收到寻呼到空口寻呼消息后，可根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置，锚点基站可直接或通过非锚点基站将下行小数据包发送给终端。本公开的数据传输方法在进行下行小数据传输时，终端保持在RRC Inactive状态，仅恢复SDT相关配置，这样可根据恢复的SDT相关配置接收锚点基站直接发送的或通过非锚点基站发送的下行小数据包，使得下行小数据传输过程更加简洁高效。
本公开实施例提供的提供一种数据传输方法，其适用于如图1所述的系统中，该系统包括终端11、锚点基站12、非锚点基站13、核心网14。终端11处于RRC Inactive状态，锚点基站12接收到核心网14需要发送给终端11的下行小数据包后，发起对终端11的空口寻呼，以及发起在RNA区域中向非锚点基站13发起RAN寻呼，使得非锚点基站13根据RAN寻呼消息发起对该终端11的空口寻呼；在空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；终端11接收到寻呼到空口寻呼消息后，可根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置，锚点基站12可直接或通过非锚点基站13将下行小数据包发送给终端11，终端11可根据恢复的SDT相关配置接收下行小数据包。
本公开实施例提供的技术方案可以适用于多种系统，尤其是5G系统。例如适用的系统可以是全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)通用分组无线业务(general packet radio service，GPRS)系统、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)系统、高级长期演进(long term evolution advanced，LTE-A)系统、通用移动系统(universal mobile telecommunication system，UMTS)、 全球互联微波接入(worldwide interoperability for microwave access，WiMAX)系统、5G新空口(New Radio,NR)系统等。这多种系统中均包括终端设备和网络设备。系统中还可以包括核心网部分，例如演进的分组系统(Evolved Packet System,EPS)、5G系统(5GS)等。
本公开实施例涉及的终端设备，可以是指向用户提供语音和/或数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备等。在不同的系统中，终端设备的名称可能也不相同，例如在5G系统中，终端设备可以称为用户设备(User Equipment，UE)。无线终端设备可以经无线接入网(Radio Access Network,RAN)与一个或多个核心网(Core Network,CN)进行通信，无线终端设备可以是移动终端设备，如移动电话(或称为“蜂窝”电话)和具有移动终端设备的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(Personal Communication Service，PCS)电话、无绳电话、会话发起协议(Session Initiated Protocol，SIP)话机、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal Digital Assistant，PDA)等设备。无线终端设备也可以称为系统、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、移动台(mobile)、远程站(remote station)、接入点(access point)、远程终端设备(remote terminal)、接入终端设备(access terminal)、用户终端设备(user terminal)、用户代理(user agent)、用户装置(user device)，本公开实施例中并不限定。
本公开实施例涉及的基站，也可以是其他的网络设备，其中该基站可以包括多个为终端提供服务的小区。根据具体应用场合不同，基站又可以称为接入点，或者可以是接入网中在空中接口上通过一个或多个扇区与无线终端设备通信的设备，或者其它名称。网络设备可用于将收到的空中帧与网际协议(Internet Protocol，IP)分组进行相互更换，作为无线终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)通信网络。网络设备还可协调对空中接口的属性管理。例如，本公开实施例涉及的网络设备可以是全球移动通信系统(Global System for Mobile communications，GSM)或码分多址接入(Code Division Multiple Access，CDMA)中的网络设备(Base Transceiver Station，BTS)，也可以是带宽码分多址接入(Wide-band Code Division Multiple Access，WCDMA)中的网络设备(NodeB)，还可以是长期演进(long term evolution，LTE)系统中的演进型网络设备(evolutional Node B，eNB或e-NodeB)、5G网络架构(next generation system)中的5G基站(gNB)，也可以是家庭演进基站(Home evolved Node B，HeNB)、中继节点(relay node)、家庭基站(femto)、微微基站(pico)等，本公开实施例中并不限定。在一些网络结构中，网络设备可以包括集中单元(centralized unit，CU)节点和分布单元 (distributed unit，DU)节点，集中单元和分布单元也可以地理上分开布置。
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，并不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
其中，方法和装置是基于同一申请构思的，由于方法和装置解决问题的原理相似，因此装置和方法的实施可以相互参见，重复之处不再赘述。
图2为本实施例提供的数据传输方法的流程图。如图2所示，本实施例提供一种数据传输方法，执行主体为终端UE，该方法具体步骤如下：
S201、接收第一基站对所述终端的空口寻呼消息；其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息；所述终端处于无线资源控制RRC非激活Inactive状态；
其中，所述第一基站为锚点基站或非锚点基站。
在本实施例中，对于处于RRC Inactive状态的终端，由于锚点基站仍保持与核心网的连接，因此锚点基站可以接收到向终端发送的下行小数据包，下行小数据包包括下行SDT(Small Data Transmission，小数据传输)数据或者NAS信令(例如可包括NAS PDU)，锚点基站可在其覆盖区域内发起对终端的空口寻呼，以及在RNA区域中向非锚点基站发起RAN寻呼，RAN寻呼即通知RNA区域内各非锚点基站发起对终端的空口寻呼，本实施例中，可在空口寻呼消息和RNA寻呼消息中包括下行小数据传输SDT的指示信息，以便终端在收到空口寻呼消息后，可获知有下行小数据包需要发送给终端。
需要说明的是，终端在锚点基站的覆盖区域内，则可接收到锚点基站发送的空口寻呼消息；若终端不在锚点基站的覆盖区域内，但在RNA区域的非锚点基站的覆盖区域内，则可接收到非锚点基站发送的空口寻呼消息。
S202、根据所述空口寻呼消息的所述下行SDT的指示信息，在RRC Inactive状态下恢复SDT相关配置。
在本实施例中，终端在接收到空口寻呼消息后，获知有下行小数据包需要接收，可保持在RRC Inactive状态下，根据预设的SDT相关配置信息仅恢复SDT相关配置。
其中，可选的，预设的SDT相关配置信息包括终端进入RRC Inactive状态时锚点基站针对SDT提供的配置信息(也即终端上下文信息中的针对SDT的配置信息)、或者预设的SDT默认配置信息。可选的，SDT相关配置信息至少是SDT DRB(Data Radio Bearer，数据无线承载)配置。相较于终端由RRC Inactive状态恢复到RRC Connected状态时需要恢 复终端上下文信息全部配置，本实施例终端仅仅恢复了SDT相关配置，可以保持在RRC Inactive状态，不需要恢复至RRC Connected状态，过程更加简化、效率更高。
进一步的，终端在恢复SDT相关配置后，可向第一基站发起Resume(恢复)过程，也即向第一基站发送RRC恢复请求RRCResumeRequest，其中可包括mt-access(响应寻呼)信息，代表终端收到寻呼，请求第一基站恢复SDT相关无线承载，可以发起针对下行小数据包的接入过程。
S203、根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
在本实施例中，在终端恢复的SDT相关配置后，第一基站可向终端发送下行小数据包，终端可根据恢复的SDT相关配置接收第一基站发送的下行小数据包，其具体过程根据第一基站是锚点基站还是非锚点基站需要进行不同的过程。
对于第一基站是锚点基站的情况(也即终端在锚点基站响应了寻呼)，锚点基站向终端发送下行小数据包的具体过程如下所示：
锚点基站对下行小数据包进行处理后，根据终端上下文信息(包括终端的SDT相关配置信息)将下行小数据包直接发送给终端。
其中对下行小数据包进行处理，对于下行小数据包为非接入层NAS信令，处理可包括将NAS信令封装在RRC消息中，并进行PDCP(Packet Data Convergence Protocol，分组数据汇聚协议)处理，然后进行以下至少一项处理：物理层的处理、MAC(Media Access Control，媒体访问控制)层的处理、RLC(Radio Link Control，无线链路控制)层的处理；而对于下行小数据包为下行SDT数据，处理可包括对下行SDT数据进行SDAP(Service Data Adaptation Protocol，服务数据适配协议)处理和PDCP处理，然后进行以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理。
可选的，在锚点基站确定所有的下行小数据包完成发送后，可生成RRC释放消息，并发送给终端，终端可根据RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态，或者继续保持RRC Inactive状态(可释放SDT相关配置)。
可选的，锚点基站在接收到核心网发送的下行小数据包后，还可判断是否采用上述的SDT过程传输下行小数据包，例如判断下行小数据包是否满足锚点基站的最大数据处理能力，若满足，则采用上述的SDT过程传输下行小数据包；若不满足，确定不采用上述的SDT过程传输下行小数据包，则向终端发送RRC恢复消息，以使终端根据RRC恢复消息，恢复RRC Inactive状态下的全量配置，以将RRC Inactive状态恢复至RRC Connected状态，在RRC Connected状态下进行数据接收。
对于第一基站是非锚点基站的情况(也即终端在非锚点基站响应了寻呼)，基站向终 端发送下行小数据包的具体过程如下所示：
锚点基站将预设的终端上下文信息发送给所述非锚点基站；此外，锚点基站可对下行小数据包进行第一处理后，将处理后的下行小数据包发送给非锚点基站；由非锚点基站根据终端上下文信息，对下行小数据包进行第二处理以及发送给终端。
其中，预设的终端上下文信息为终端的SDT相关配置信息；或者预设的终端上下文信息也可以是终端的全量上下文信息，其中全量上下文信息中包括终端的SDT相关配置信息。可选的，终端的SDT相关配置信息至少包括SDT DRB相关的RLC配置。
其中，对于下行小数据包的处理可由锚点基站进行一部分处理(例如高层处理)，由非锚点基站进行另一部分处理(例如底层处理)，具体的，对于下行小数据包为非接入层NAS信令，锚点基站可将NAS信令封装在RRC消息中，并进行PDCP处理，然后发送给非锚点基站进行以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理；而对于下行小数据包为下行SDT数据，锚点基站可对下行SDT数据进行SDAP处理和PDCP处理，然后发送给非锚点基站进行以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理。
可选的，锚点基站在将下行小数据包发送给非锚点基站时，若下行小数据包为下行SDT数据，可接收非锚点基站发送的下行SDT数据转发隧道信息，例如DL SDT DRB对应的Xn数据转发通道信息，进而锚点基站通过下行SDT数据转发隧道，将下行小数据包发送给非锚点基站；若下行小数据包为NAS信令，锚点基站可通过Xn接口将处理后的下行小数据包发送给非锚点基站。
可选的，非锚点基站在接收到终端对空口寻呼的响应后，可向锚点基站发送终端上下文信息请求消息，从而使得锚点基站响应于终端上下文信息请求消息，将终端上下文信息发送给非锚点基站。可选的，终端上下文信息请求消息中可携带非锚点基站的最大SDT数据处理能力，锚点基站可判断下行小数据包的数据量是否满足非锚点基站的最大SDT数据处理能力，若满足，则确定采用上述的SDT过程传输下行小数据包，不进行锚点转移，可进一步简化下行小数据传输过程，提高传输效率；若不满足，则确定不采用SDT过程传输下行小数据包，需要进行锚点转移和路径转换，也即将终端的全量上下文信息以及下行小数据包发送给非锚点基站，以由非锚点基站根据所述终端的全量上下文信息转换为新锚点基站，由新锚点基站对下行小数据包进行全部的处理后发送给终端，可向终端RRC恢复消息，使终端将RRC Inactive状态恢复至RRC连接Connected状态进行数据接收，保证了数据稳定传输。
可选的，在上述实施例的基础上，若在锚点基站或非锚点基站在确定所有的下行小数 据包完成发送后，可生成RRC释放消息，并由非锚点基站发送给终端，终端可根据RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态，或者RRC Inactive状态(可释放SDT相关配置)。
本实施例提供的数据传输方法，针对RRC Inactive状态的终端，锚点基站接收到核心网发送的下行小数据包后，发起对所述终端的空口寻呼、以及由RNA区域中非锚点基站对所述终端的空口寻呼；在空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；终端接收到寻呼到空口寻呼消息后，可根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置，锚点基站可直接或通过非锚点基站将下行小数据包发送给终端。本公开的数据传输方法在进行下行小数据传输时，终端保持在RRC Inactive状态，仅恢复SDT相关配置，这样可根据恢复的SDT相关配置接收锚点基站直接发送的或通过非锚点基站发送的下行小数据包，使得下行小数据传输过程更加简洁高效。
为了进一步介绍上述的数据传输方法，本公开实施例还提供以下示例进行详细的举例说明。
示例一：终端在锚点基站下响应寻呼
本示例提供的数据传输方法的信令图如图3所示，该方法具体步骤如下：
S301、锚点基站接收核心网向RRC Inactive状态的终端发送的下行小数据包；
S302、锚点基站发起对终端的空口寻呼、以及在基于无线接入网RAN的通知区域RNA中向非锚点基站发起RAN寻呼；空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；
S303、终端接收到锚点基站发送的空口寻呼消息，根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置。
S304、终端向锚点基站发送RRC恢复请求，其中包括mt-access信息，以响应空口寻呼；
S305、锚点基站对下行小数据包进行处理；
其中，对于下行小数据包为非接入层NAS信令，处理可包括将NAS信令封装在RRC消息中，并进行PDCP处理，然后进行以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理；而对于下行小数据包为下行SDT数据，处理可包括对下行SDT数据进行SDAP处理和PDCP处理，然后进行以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理；
S306、锚点基站根据终端上下文信息将下行小数据包直接发送给终端；
其中，终端上下文信息包括终端的SDT相关配置信息；
S307、终端根据恢复的SDT相关配置接收锚点基站发送的下行小数据包。
示例二：终端在非锚点基站下响应寻呼、锚点基站决定采用SDT过程传输下行小数据包(不进行锚点转移)：
本示例提供的数据传输方法的信令图如图4所示，该方法具体步骤如下：
S401、锚点基站接收核心网向RRC Inactive状态的终端发送的下行小数据包；
S402、锚点基站发起对终端的空口寻呼、以及在基于无线接入网RAN的通知区域RNA中向非锚点基站发起RAN寻呼；空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；
S403、终端接收到非锚点基站发送的空口寻呼消息，根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置。
S404、终端向非锚点基站发送RRC恢复请求，其中包括mt-access信息，以响应空口寻呼；
S405、非锚点基站向锚点基站发送终端上下文信息请求消息；
终端上下文信息请求消息中可携带非锚点基站的最大SDT数据处理能力，以供锚点基站判断下行小数据包的数据量是否满足非锚点基站的最大SDT数据处理能力；
S406、锚点基站确定采用SDT过程传输下行小数据包，不进行锚点转移；
锚点基站确定下行小数据包的数据量满足非锚点基站的最大SDT数据处理能力，确定采用上述的SDT过程传输下行小数据包，不进行锚点转移；
S407、锚点基站将预设的终端上下文信息发送给所述非锚点基站；
其中，预设的终端上下文信息为终端的SDT相关配置信息；或者预设的终端上下文信息也可以是终端的全量上下文信息，其中全量上下文信息中包括终端的SDT相关配置信息；可选的，终端的SDT相关配置信息至少包括SDT DRB相关的RLC配置；
S408、针对下行SDT数据，非锚点基站向锚点基站发送下行SDT数据转发隧道信息；
当然，对于下行NAS信令，则不需要非锚点基站分配下行SDT数据转发隧道以及向锚点基站发送下行SDT数据转发隧道信息；
S409、锚点基站对下行小数据包进行第一处理；
其中，而对于下行小数据包为下行SDT数据，处理可包括对下行SDT数据进行SDAP处理和PDCP处理；对于下行小数据包为非接入层NAS信令，处理可包括将NAS信令封装在RRC消息中，并进行PDCP处理，
S410、锚点基站将经过第一处理的下行小数据包发送给非锚点基站；
若下行小数据包为下行SDT数据，锚点基站通过非锚点基站分配的下行SDT数据转 发隧道将下行小数据包发送给非锚点基站；若下行小数据包为NAS信令，锚点基站可通过Xn接口将处理后的下行小数据包发送给非锚点基站；
S4011、非锚点基站根据终端上下文信息的下行小数据包进行第二处理；
其中，第二处理可包括以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理；
S4012、非锚点基站根据终端上下文信息将下行小数据包发送给终端；
S4013、终端根据恢复的SDT相关配置接收非锚点基站发送的下行小数据包。
示例三：终端在非锚点基站下响应寻呼、锚点基站决定进行正常先行数据传输(进行锚点转移)：
本示例提供的数据传输方法的信令图如图5所示，该方法具体步骤如下：
S501、锚点基站接收核心网向RRC Inactive状态的终端发送的下行小数据包；
S502、锚点基站发起对终端的空口寻呼、以及在基于无线接入网RAN的通知区域RNA中向非锚点基站发起RAN寻呼；空口寻呼消息和RAN寻呼消息中包括下行小数据传输SDT的指示信息；
S503、终端接收到非锚点基站发送的空口寻呼消息，根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置。
S504、终端向非锚点基站发送RRC恢复请求，其中包括mt-access信息，以响应空口寻呼；
S505、非锚点基站向锚点基站发送终端上下文信息请求消息；
终端上下文信息请求消息中可携带非锚点基站的最大SDT数据处理能力，以供锚点基站判断下行小数据包的数据量是否满足非锚点基站的最大SDT数据处理能力；
S505、锚点基站确定采用进行正常先行数据传输，进行锚点转移；
锚点基站确定下行小数据包的数据量不满足非锚点基站的最大SDT数据处理能力，确定采用进行正常先行数据传输，进行锚点转移；
S506、锚点基站将将终端的全量上下文信息以及下行小数据包发送给非锚点基站；
S507、非锚点基站根据终端的全量上下文信息转换为新锚点基站，向终端RRC恢复消息；
S508、终端将RRC Inactive状态恢复至RRC Connected状态；
S509、非锚点基站对下行小数据包进行处理；
其中，对于下行小数据包为非接入层NAS信令，处理可包括将NAS信令封装在RRC消息中，并进行PDCP处理，然后进行以下至少一项处理：物理层的处理、MAC层的处 理、RLC层的处理；而对于下行小数据包为下行SDT数据，处理可包括对下行SDT数据进行SDAP处理和PDCP处理，然后进行以下至少一项处理：物理层的处理、MAC层的处理、RLC层的处理；
S5010、非锚点基站将下行小数据包发送给终端。
需要说明的是，上述示例仅仅是可选实施方式，并不限制各步骤的先后顺序，在合理范围内可对各步骤进行调整，包括执行先后顺序调整、步骤的增加、删除、修改等。
图6为本实施例提供的数据传输方法的流程图。如图6所示，本实施例提供一种数据传输方法，执行主体为锚点基站，该方法具体步骤如下：
S601、接收核心网向RRC Inactive状态的终端发送的下行小数据包；
S602、向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，以使非锚点基站根据RAN寻呼消息向所述终端发送空口寻呼消息；其中，RAN寻呼消息、以及锚点基站和非锚点基站的空口寻呼消息包括下行小数据传输SDT的指示信息；
S603、若确定所述终端响应锚点基站或非锚点基站的空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
在一种可选实施例中，S603所述直接将下行小数据包发送给所述终端，包括：
若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
在另一种可选实施例中，S603所述通过非锚点基站将下行小数据包发送给所述终端，包括：
若确定所述终端响应非锚点基站的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以由所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
进一步的，所述将所述终端的终端上下文信息发送给所述非锚点基站，包括：
接收所述非锚点基站发送的终端上下文信息请求消息；
响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站。
在上述实施例的基础上，可选的，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
所述响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站，包括：
若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的终端上下文信息发送给所述非锚点基站。
在上述任一实施例的基础上，所述终端上下文信息为所述终端的SDT相关配置信息；或者，
所述终端上下文信息为所述终端的全量上下文信息，其中全量上下文信息中包括所述终端的SDT相关配置信息。
在一种可选实施例中，若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移，也即由所述非锚点基站根据所述终端的全量的终端上下文信息转换为新锚点基站对下行小数据包进行第一处理和第二处理后发送给所述终端。
可选的，上述各实施例中所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理；
若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，
若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理。
在上述任一实施例的基础上，所述将处理后的下行小数据包发送给所述非锚点基站，包括：
若下行小数据包为下行SDT数据，则通过所述非锚点基站分配的下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
在上述任一实施例的基础上，在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态或者RRC Inactive状态。
本实施例中提供的数据传输方法，是上述实施例中锚点基站侧的方法，是基于同一申请构思的，由于方法和装置决问题的原理相似，因此，重复之处不再赘述。
图7为本实施例提供的数据传输方法的流程图。如图2所示，本实施例提供一种数据 传输方法，执行主体为非锚点基站，该方法具体步骤如下：
S701、接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
S702、根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼；其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息；所述终端处于RRC Inactive状态；
S703、若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；
S704、从所述锚点基站获取经过第一处理的下行小数据包；
S705、根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
可选的，S703所述从所述锚点基站获取所述终端的终端上下文信息，包括：
向所述锚点基站发送终端上下文信息请求消息；
接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
可选的，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
进一步的，所述接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息，包括：
接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力后发送的所述终端的终端上下文信息。
在一种可选实施例中，所述向所述锚点基站发送终端上下文信息请求消息后，还包括：
接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
根据所述终端的全量上下文信息转换为新锚点基站，并向所述终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；
根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述实施例的基础上，S704所述从所述锚点基站获取经过第一处理的下行小数据包，包括：
若下行小数据包为下行SDT数据，对下行SDT数据分配下行SDT数据转发隧道，并将下行SDT数据转发隧道信息发送给所述锚点基站；
接收所述锚点基站通过所述下行SDT数据转发隧道发送的经过第一处理的下行小数 据包；或者
若下行小数据包为NAS信令，则接收所述锚点基站通过Xn接口发送的经过第一处理的下行小数据包。
本实施例中提供的数据传输方法，是上述实施例中非锚点基站侧的方法，是基于同一申请构思的，由于方法和装置决问题的原理相似，因此，重复之处不再赘述。
图8为本公开实施例终端的结构图。本实施例提供的终端可以执行终端侧的方法实施例提供的处理流程，如图8所示，所述终端810包括存储器811，收发机812，处理器813。
其中，在图8中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器813代表的一个或多个处理器和存储器811代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机812可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器813负责管理总线架构和通常的处理，存储器811可以存储处理器813在执行操作时所使用的数据。
处理器813可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
存储器811，用于存储计算机程序；收发机812，用于在所述处理器813的控制下收发数据；处理器813，用于读取所述存储器811中的计算机程序并执行以下操作：
接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息；所述终端处于无线资源控制RRC非激活Inactive状态；所述第一基站为锚点基站或非锚点基站；
根据所述空口寻呼消息的所述下行SDT的指示信息，在RRC Inactive状态下恢复SDT相关配置；
根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
在上述任一实施例的基础上，所述处理器813在根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置时，用于：
根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，以请求所述第一基站恢复SDT相关无线承载。
在上述任一实施例的基础上，所述预设的SDT相关配置信息包括所述终端进入RRC  Inactive状态时锚点基站针对SDT提供的配置信息、或者预设的SDT默认配置信息。
在上述任一实施例的基础上，所述下行小数据包包括下行SDT数据或者非接入层NAS信令。
在上述任一实施例的基础上，所述处理器813在RRC Inactive状态下恢复SDT相关配置后，还用于：
接收所述第一基站发送的RRC恢复消息；
根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected状态。
在上述任一实施例的基础上，所述处理器813在RRC Inactive状态下恢复SDT相关配置后，还用于：
接收所述第一基站发送的RRC释放消息；
根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
本公开实施例提供的终端可以具体用于执行上述终端侧的方法实施例，具体功能此处不再赘述。
图9为本公开实施例提供的锚点基站的结构图。本实施例提供的基站可以执行基站侧的方法实施例提供的处理流程，如图9所示，所述基站820包括存储器821，收发机822，处理器823。
其中，在图9中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器823代表的一个或多个处理器和存储器821代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机822可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器823负责管理总线架构和通常的处理，存储器821可以存储处理器823在执行操作时所使用的数据。
处理器823可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
存储器821，用于存储计算机程序；收发机822，用于在所述处理器823的控制下收发数据；处理器823，用于读取所述存储器821中的计算机程序并执行以下操作：
接收核心网向RRC Inactive状态的终端发送的下行小数据包；
向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，以使非锚点基站根据RAN寻呼消息向所述终端发送空口寻呼消息；其中，RAN寻呼消息、以及锚点基站和非锚点基站的空口寻呼消息包括下行小数据传输SDT的指示信息；
若确定所述终端响应锚点基站或非锚点基站的空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
在上述任一实施例的基础上，所述处理器823在通过非锚点基站将下行小数据包发送给所述终端时，用于：
若确定所述终端响应非锚点基站的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以由所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
在上述任一实施例的基础上，所述处理器823在直接将下行小数据包发送给所述终端时，用于：
若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述任一实施例的基础上，所述处理器823在将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
接收所述非锚点基站发送的终端上下文信息请求消息；
响应于所述终端上下文信息请求消息，将所述终端上下文信息发送给所述非锚点基站。
在上述任一实施例的基础上，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
所述处理器823在响应于所述终端上下文信息请求消息，将所述终端上下文信息发送给所述非锚点基站时，用于：
若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的上下文信息发送给所述非锚点基站。
在上述任一实施例的基础上，所述终端上下文信息为所述终端的SDT相关配置信息；或者，
所述终端上下文信息为所述终端的全量上下文信息，其中全量上下文信息中包括所述 终端的SDT相关配置信息。
在上述任一实施例的基础上，所述处理器823还用于：
若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移，也即由所述非锚点基站根据所述终端的全量的终端上下文信息转换为新锚点基站对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述任一实施例的基础上，所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理；
若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，
若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理。
在上述任一实施例的基础上，所述处理器823在将处理后的下行小数据包发送给所述非锚点基站时，用于：
若下行小数据包为下行SDT数据，接收所述非锚点基站发送的下行SDT数据转发隧道信息；
通过所述下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
在上述任一实施例的基础上，所述处理器823还用于：
在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态或者RRC Inactive状态。
本公开实施例提供的锚点基站可以具体用于执行上述锚点基站侧的方法实施例，具体功能此处不再赘述。
图10为本公开实施例提供的非锚点基站的结构图。本实施例提供的非锚点基站可以执行非锚点基站侧的方法实施例提供的处理流程，如图10所示，所述非锚点基站830包括存储器831，收发机832，处理器833。
其中，在图10中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器833代表的一个或多个处理器和存储器831代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机832可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器833负责管理总线架构和通常的处理，存储器831可以存储处理器833在执行操作时所使用的数据。
处理器833可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
存储器831，用于存储计算机程序；收发机832，用于在所述处理器833的控制下收发数据；处理器833，用于读取所述存储器831中的计算机程序并执行以下操作：
接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼；其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息；所述终端处于RRC Inactive状态；
若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；
从所述锚点基站获取经过第一处理的下行小数据包；
根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
在上述任一实施例的基础上，所述处理器833在从所述锚点基站获取所述终端的终端上下文信息时，用于：
向所述锚点基站发送终端上下文信息请求消息；
接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
在上述任一实施例的基础上，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
所述处理器833在接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息时，用于：
接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数 据处理能力后发送的所述终端的终端上下文信息。
在上述任一实施例的基础上，所述处理器833在向所述锚点基站发送终端上下文信息请求消息后，还用于：
接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
根据所述终端的全量上下文信息转换为新锚点基站，并向所述终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；
根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述任一实施例的基础上，所述处理器833在从所述锚点基站获取经过第一处理的下行小数据包时，用于：
若下行小数据包为下行SDT数据，对下行SDT数据分配下行SDT数据转发隧道，并将下行SDT数据转发隧道信息发送给所述锚点基站；
接收所述锚点基站通过所述下行SDT数据转发隧道发送的经过第一处理的下行小数据包；或者
若下行小数据包为NAS信令，则接收所述锚点基站通过Xn接口发送的经过第一处理的下行小数据包。
本公开实施例提供的非锚点基站可以具体用于执行上述非锚点基站侧的方法实施例，具体功能此处不再赘述。
图11为本公开实施例提供的终端的结构图。本实施例提供的终端可以执行终端侧的方法实施例提供的处理流程，如图11所示，该终端910包括接收单元911、处理单元912。
接收单元911，用于接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息；所述终端处于无线资源控制RRC非激活Inactive状态；所述第一基站为锚点基站或非锚点基站；
处理单元912，用于根据所述空口寻呼消息的所述下行SDT的指示信息，在RRC Inactive状态下恢复SDT相关配置；
所述接收单元911还用于，根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
在上述任一实施例的基础上，所述处理单元912在根据预设的SDT相关配置信息，在RRC Inactive状态下恢复SDT相关配置时，用于：
根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，以请求所述第一基站恢复SDT相关无线承载。
在上述任一实施例的基础上，所述预设的SDT相关配置信息包括所述终端进入RRC Inactive状态时锚点基站针对SDT提供的配置信息、或者预设的SDT默认配置信息。
在上述任一实施例的基础上，所述下行小数据包包括下行SDT数据或者非接入层NAS信令。
在上述任一实施例的基础上，在RRC Inactive状态下恢复SDT相关配置后，所述接收单元911还用于，接收所述第一基站发送的RRC恢复消息；
所述处理单元912还用于，根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected状态。
在上述任一实施例的基础上，在RRC Inactive状态下恢复SDT相关配置后，所述接收单元911还用于，接收所述第一基站发送的RRC释放消息；
所述处理单元912还用于，根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
本公开实施例提供的终端可以具体用于执行上述终端侧的方法实施例，具体功能此处不再赘述。
图12为本公开实施例提供的锚点基站的结构图。本实施例提供的锚点基站可以执行锚点基站侧的方法实施例提供的处理流程，如图12所示，该锚点基站920包括接收单元921、寻呼单元922、发送单元923。
接收单元921，用于接收核心网向RRC Inactive状态的终端发送的下行小数据包；
寻呼单元922，用于向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，以使非锚点基站根据RAN寻呼消息向所述终端发送空口寻呼消息；其中，RAN寻呼消息、以及锚点基站和非锚点基站的空口寻呼消息包括下行小数据传输SDT的指示信息；
发送单元923，用于若确定所述终端响应锚点基站或非锚点基站的空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
在上述任一实施例的基础上，所述发送单元923在通过非锚点基站将下行小数据包发送给所述终端时，用于：
若确定所述终端响应非锚点基站的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以由所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
在上述任一实施例的基础上，所述发送单元923在直接将下行小数据包发送给所述终端时，用于：
若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述任一实施例的基础上，在将所述终端的终端上下文信息发送给所述非锚点基站时，通过所述接收单元921接收所述非锚点基站发送的终端上下文信息请求消息；
所述发送单元923响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站。
在上述任一实施例的基础上，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
所述发送单元923在响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的终端上下文信息发送给所述非锚点基站。
在上述任一实施例的基础上，所述终端上下文信息为所述终端的SDT相关配置信息；或者，
所述终端上下文信息为所述终端的全量上下文信息，其中全量上下文信息中包括所述终端的SDT相关配置信息。
在上述任一实施例的基础上，若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，所述发送单元923将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移，也即由所述非锚点基站根据所述终端的全量的终端上下文信息转换为新锚点基站对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述任一实施例的基础上，所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理；
若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，
若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据 适配协议SDAP处理和PDCP处理。
在上述任一实施例的基础上，所述发送单元923在将处理后的下行小数据包发送给所述非锚点基站时，用于：
若下行小数据包为下行SDT数据，接收所述非锚点基站发送的下行SDT数据转发隧道信息；
通过所述下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
在上述任一实施例的基础上，所述发送单元923还用于，在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle状态或者RRC Inactive状态。
本公开实施例提供的锚点基站可以具体用于执行上述锚点基站侧的方法实施例，具体功能此处不再赘述。
图13为本公开实施例提供的非锚点基站的结构图。本实施例提供的数据传输装置可以执行非锚点基站侧的方法实施例提供的处理流程，如图13所示，该非锚点基站930包括寻呼单元931、获取单元932、发送单元933、接收单元934。
接收单元934，用于接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
寻呼单元931，用于根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼；其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息；所述终端处于RRC Inactive状态；
获取单元932，用于若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；从所述锚点基站获取经过第一处理的下行小数据包；
发送单元933，用于根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
在上述任一实施例的基础上，所述获取单元932在从所述锚点基站获取所述终端的终端上下文信息时，用于：
向所述锚点基站发送终端上下文信息请求消息；
接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
在上述任一实施例的基础上，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
所述获取单元932在接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息时，用于：
接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力后发送的所述终端的终端上下文信息。
在上述任一实施例的基础上，所述获取单元932在向所述锚点基站发送终端上下文信息请求消息后，还用于，接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
所述发送单元933还用于，根据所述终端的全量上下文信息转换为新锚点基站，并向所述终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
在上述任一实施例的基础上，所述获取单元932在从所述锚点基站获取经过第一处理的下行小数据包时，用于：
若下行小数据包为下行SDT数据，对下行SDT数据分配下行SDT数据转发隧道，并将下行SDT数据转发隧道信息发送给所述锚点基站；
接收所述锚点基站通过所述下行SDT数据转发隧道发送的经过第一处理的下行小数据包；或者
若下行小数据包为NAS信令，则接收所述锚点基站通过Xn接口发送的经过第一处理的下行小数据包。
本公开实施例提供的数据传输装置可以具体用于执行上非锚点述基站侧的方法实施例，具体功能此处不再赘述。
需要说明的是，本公开上述实施例中对单元的划分是示意性的，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。另外，在本公开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。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元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 以存储在一个处理器可读取存储介质中。基于这样的理解，本公开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全部或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)或处理器(processor)执行本公开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。
本公开另一实施例还提供一种计算机可读存储介质，计算机可读存储介质存储有计算机程序，计算机程序用于使处理器执行终端或锚点基站或非锚点基站侧的数据传输方法。
其中，计算机可读存储介质可以是处理器能够存取的任何可用介质或数据存储设备，包括但不限于磁性存储器(例如软盘、硬盘、磁带、磁光盘(MO)等)、光学存储器(例如CD、DVD、BD、HVD等)、以及半导体存储器(例如ROM、EPROM、EEPROM、非易失性存储器(NAND FLASH)、固态硬盘(SSD))等。
本公开另一实施例还提供一种计算机程序产品，包括计算机程序，计算机程序用于使处理器执行终端或锚点基站或非锚点基站侧的数据传输方法。
本领域内的技术人员应明白，本公开的实施例可提供为方法、系统、或计算机程序产品。因此，本公开可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本公开是参照根据本公开实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机可执行指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机可执行指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些处理器可执行指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的处理器可读存储器中，使得存储在该处理器可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些处理器可执行指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (52)

  1. 一种数据传输方法，其中，应用于终端，该方法包括：
    接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态，所述第一基站为锚点基站或非锚点基站；
    根据所述空口寻呼消息中包含的所述下行SDT的指示信息，在所述RRC Inactive状态下恢复SDT相关配置；
    根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
  2. 根据权利要求1所述的方法，其中，所述在RRC Inactive状态下恢复SDT相关配置，包括：
    根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，所述RRC恢复请求消息用于请求所述第一基站恢复SDT相关无线承载。
  3. 根据权利要求1或2所述的方法，其中，所述在RRC Inactive状态下恢复SDT相关配置后，还包括：
    接收所述第一基站发送的RRC恢复消息；
    根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected状态。
  4. 根据权利要求1所述的方法，其中，所述在RRC Inactive状态下恢复SDT相关配置后，还包括：
    接收所述第一基站发送的RRC释放消息；
    根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
  5. 一种数据传输方法，其中，应用于锚点基站，该方法包括：
    接收核心网向RRC Inactive状态的终端发送的下行小数据包；
    向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，所述RAN寻呼消息用于指示所述非锚点基站向所述终端发送空口寻呼消息；其中，所述RAN寻呼消息以及所述空口寻呼消息中包括下行小数据传输SDT的指示信息；
    若确定所述终端响应所述空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
  6. 根据权利要求5所述的方法，其中，所述通过非锚点基站将下行小数据包发送给所述终端，包括：
    若确定所述终端响应非锚点基站发送的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
    对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以使所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
  7. 根据权利要求5所述的方法，其中，所述直接将下行小数据包发送给所述终端，包括：
    若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
  8. 根据权利要求6或7所述的方法，其中，若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理；
    所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理。
  9. 根据权利要求6所述的方法，其中，所述将所述终端的终端上下文信息发送给所述非锚点基站，包括：
    接收所述非锚点基站发送的终端上下文信息请求消息；
    响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站。
  10. 根据权利要求9所述的方法，其中，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
    所述响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站，包括：
    若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的终端上下文信息发送给所述非锚点基站；其中所述终端上下文信息中包含所述终端的SDT相关配置信息。
  11. 根据权利要求10所述的方法，其中，所述接收所述非锚点基站发送的终端上下文信息请求消息后，还包括：
    若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移。
  12. 根据权利要求6所述的方法，其中，所述将处理后的下行小数据包发送给所述非锚点基站，包括：
    若下行小数据包为下行SDT数据，则通过所述非锚点基站分配的下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
    若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
  13. 根据权利要求5-7任一项所述的方法，其中，还包括：
    在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle或者保持RRC Inactive状态。
  14. 一种数据传输方法，其中，应用于非锚点基站，该方法包括：
    接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
    根据锚点基站的RAN寻呼消息发起对终端的空口寻呼，其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息，所述终端处于RRC Inactive状态；
    若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息以及经过第一处理的下行小数据包；
    根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
  15. 根据权利要求14所述的方法，其中，所述从所述锚点基站获取所述终端的终端上下文信息，包括：
    向所述锚点基站发送终端上下文信息请求消息；
    接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
  16. 根据权利要求15所述的方法，其中，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
    所述接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息，包括：
    接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数 据处理能力后发送的所述终端的终端上下文信息。
  17. 根据权利要求15所述的方法，其中，所述向所述锚点基站发送终端上下文信息请求消息后，还包括：
    接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
    根据所述终端的全量上下文信息转换为新锚点基站，并向所述终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；
    根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
  18. 一种终端，其中，包括存储器，收发机，处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态，所述第一基站为锚点基站或非锚点基站；
    根据所述空口寻呼消息中包含的所述下行SDT的指示信息，在所述RRC Inactive状态下恢复SDT相关配置；
    根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
  19. 根据权利要求18所述的终端，其中，所述处理器在RRC Inactive状态下恢复SDT相关配置时，用于：
    根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，所述RRC恢复请求消息用于请求所述第一基站恢复SDT相关无线承载。
  20. 根据权利要求18或19所述的终端，其中，所述处理器在RRC Inactive状态下恢复SDT相关配置后，还用于：
    接收所述第一基站发送的RRC恢复消息；
    根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected状态。
  21. 根据权利要求18所述的终端，其中，所述处理器在RRC Inactive状态下恢复SDT相关配置后，还用于：
    接收所述第一基站发送的RRC释放消息；
    根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
  22. 一种锚点基站，其中，包括存储器，收发机，处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    接收核心网向RRC Inactive状态的终端发送的下行小数据包；
    向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，所述RAN寻呼消息用于指示所述非锚点基站向所述终端发送空口寻呼消息；其中，所述RAN寻呼消息以及所述空口寻呼消息中包括下行小数据传输SDT的指示信息；
    若确定所述终端响应所述空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
  23. 根据权利要求22所述的锚点基站，其中，所述处理器在通过非锚点基站将下行小数据包发送给所述终端，用于：
    若确定所述终端响应非锚点基站发送的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
    对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以使所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
  24. 根据权利要求22所述的锚点基站，其中，所述处理器在直接将下行小数据包发送给所述终端时，用于：
    若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
  25. 根据权利要求23或24所述的锚点基站，其中，若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理；
    所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理。
  26. 根据权利要求23所述的锚点基站，其中，所述处理器在将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
    接收所述非锚点基站发送的终端上下文信息请求消息；
    响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站。
  27. 根据权利要求26所述的锚点基站，其中，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
    所述处理器在响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
    若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的终端上下文信息发送给所述非锚点基站；其中所述终端上下文信息中包含所述终端的SDT相关配置信息。
  28. 根据权利要求27所述的锚点基站，其中，所述处理器在接收所述非锚点基站发送的终端上下文信息请求消息后，还用于：
    若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移。
  29. 根据权利要求23所述的锚点基站，其中，所述处理器在将处理后的下行小数据包发送给所述非锚点基站时，用于：
    若下行小数据包为下行SDT数据，则通过所述非锚点基站分配的下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
    若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非锚点基站。
  30. 根据权利要求22-24任一项所述的锚点基站，其中，所述处理器还用于：
    在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle或者保持RRC Inactive状态。
  31. 一种非锚点基站，其中，包括存储器，收发机，处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
    根据锚点基站的RAN寻呼消息发起对终端的空口寻呼，其中，RAN寻呼消息和空口 寻呼消息中包括下行小数据传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态；
    若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；
    从所述锚点基站获取经过第一处理的下行小数据包；
    根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
  32. 根据权利要求31所述的非锚点基站，其中，所述处理器在从所述锚点基站获取所述终端的终端上下文信息时，用于：
    向所述锚点基站发送终端上下文信息请求消息；
    接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
  33. 根据权利要求32所述的非锚点基站，其中，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
    所述处理器在接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息时，用于：
    接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力后发送的所述终端的终端上下文信息。
  34. 根据权利要求32所述的非锚点基站，其中，所述处理器在向所述锚点基站发送终端上下文信息请求消息后，还用于：
    接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
    根据所述终端的全量上下文信息转换为新锚点基站，并向所述终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；
    根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
  35. 一种终端，其中，包括：
    接收单元，用于接收第一基站对所述终端的空口寻呼消息，其中，所述空口寻呼消息包括下行小数据传输SDT的指示信息，所述终端处于无线资源控制RRC非激活Inactive状态，所述第一基站为锚点基站或非锚点基站；
    处理单元，用于根据所述空口寻呼消息中包含的所述下行SDT的指示信息，在所述RRC Inactive状态下恢复SDT相关配置；
    所述接收单元还用于，根据恢复的SDT相关配置，接收所述第一基站发送的下行小数据包。
  36. 根据权利要求35所述的终端，其中，所述处理单元在RRC Inactive状态下恢复SDT相关配置时，用于：
    根据预设的SDT相关无线承载配置信息，恢复SDT相关无线承载的配置，并向所述第一基站发送RRC恢复请求消息，所述RRC恢复请求消息用于请求所述第一基站恢复SDT相关无线承载。
  37. 根据权利要求35或36所述的终端，其中，在RRC Inactive状态下恢复SDT相关配置后，所述接收单元还用于，接收所述第一基站发送的RRC恢复消息；
    所述接收单元还用于，根据所述RRC恢复消息，将终端状态由RRC Inactive状态恢复至RRC连接Connected状态。
  38. 根据权利要求35所述的终端，其中，在RRC Inactive状态下恢复SDT相关配置后，所述接收单元还用于，接收所述第一基站发送的RRC释放消息；
    所述处理单元还用于，根据所述RRC释放消息，停止SDT下行小数据包的接收，进入RRC空闲Idle状态或者保持RRC Inactive状态。
  39. 一种锚点基站，其中，包括：
    接收单元，用于接收核心网向RRC Inactive状态的终端发送的下行小数据包；
    寻呼单元，用于向所述终端发送空口寻呼消息，和/或，向基于无线接入网RAN的通知区域RNA中的非锚点基站发送RAN寻呼消息，所述RAN寻呼消息用于指示所述非锚点基站向所述终端发送空口寻呼消息；其中，所述RAN寻呼消息以及所述空口寻呼消息中包括下行小数据传输SDT的指示信息；
    发送单元，用于若确定所述终端响应所述空口寻呼消息，则直接或通过非锚点基站将下行小数据包发送给所述终端。
  40. 根据权利要求39所述的锚点基站，其中，所述发送单元在通过非锚点基站将下行小数据包发送给所述终端时，用于：
    若确定所述终端响应非锚点基站发送的空口寻呼消息，则将所述终端的终端上下文信息发送给所述非锚点基站；
    对所述下行小数据包进行第一处理后，将处理后的下行小数据包发送给所述非锚点基站，以使所述非锚点基站根据所述终端上下文信息，对接收到的所述处理后的下行小数据包进行第二处理，并发送给所述终端。
  41. 根据权利要求39所述的锚点基站，其中，所述发送单元在直接将下行小数据包 发送给所述终端时，用于：
    若确定所述终端响应锚点基站的空口寻呼消息，则对下行小数据包进行第一处理和第二处理后发送给所述终端。
  42. 根据权利要求40或41所述的锚点基站，其中，若下行小数据包为非接入层NAS信令，所述第一处理包括将NAS信令封装在RRC消息中，并进行分组数据汇聚协议PDCP处理；或者，若下行小数据包为下行SDT数据，所述第一处理包括对下行SDT数据进行服务数据适配协议SDAP处理和PDCP处理；
    所述第二处理包括以下至少一项：物理层的处理、媒体访问控制MAC层的处理、无线链路控制RLC层的处理。
  43. 根据权利要求40所述的锚点基站，其中，所述发送单元在将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
    通过所述接收单元接收所述非锚点基站发送的终端上下文信息请求消息；
    所述发送单元用于响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站。
  44. 根据权利要求43所述的锚点基站，其中，所述终端上下文信息请求消息包括所述非锚点基站的最大SDT数据处理能力；
    所述发送单元在响应于所述终端上下文信息请求消息，将所述终端的终端上下文信息发送给所述非锚点基站时，用于：
    若确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力，则确定采用SDT过程传输下行小数据包，将所述终端的终端上下文信息发送给所述非锚点基站；其中所述终端上下文信息中包含所述终端的SDT相关配置信息。
  45. 根据权利要求44所述的锚点基站，其中，所述接收所述非锚点基站发送的终端上下文信息请求消息后，所述发送单元还用于：
    若确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力，则确定不采用SDT过程传输下行小数据包，将所述终端的全量的终端上下文信息以及下行小数据包发送给所述非锚点基站，以进行锚点转移。
  46. 根据权利要求40所述的锚点基站，其中，所述发送单元在将处理后的下行小数据包发送给所述非锚点基站时，用于：
    若下行小数据包为下行SDT数据，则通过所述非锚点基站分配的下行SDT数据转发隧道，将处理后的下行小数据包发送给所述非锚点基站；或者
    若下行小数据包为NAS信令，则通过Xn接口将处理后的下行小数据包发送给所述非 锚点基站。
  47. 根据权利要求39-41任一项所述的锚点基站，其中，所述发送单元还用于，
    在确定下行小数据包完成发送后，生成RRC释放消息，并传输至所述终端，以使所述终端根据所述RRC释放消息，停止下行小数据包的接收，进入RRC Idle或者保持RRC Inactive状态。
  48. 一种非锚点基站，其中，包括：
    接收单元，用于接收锚点基站发送的无线接入网RAN寻呼信息，所述RAN寻呼信息为所述锚点基站向RNA区域中的非锚点基站发送的；
    寻呼单元，用于根据锚点基站的RAN寻呼消息发起对所述终端的空口寻呼，其中，RAN寻呼消息和空口寻呼消息中包括下行小数据传输SDT的指示信息，所述终端处于RRC Inactive状态；
    获取单元，用于若确定所述终端响应所述非锚点基站的空口寻呼消息，则从所述锚点基站获取所述终端的终端上下文信息；从所述锚点基站获取经过第一处理的下行小数据包；
    发送单元，用于根据所述终端上下文信息，对下行小数据包进行第二处理，并发送给所述终端。
  49. 根据权利要求48所述的方法，其中，所述获取单元在从所述锚点基站获取所述终端的终端上下文信息时，用于：
    向所述锚点基站发送终端上下文信息请求消息；
    接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息。
  50. 根据权利要求49所述的方法，其中，所述终端上下文信息请求消息包括所述非锚点基站的最大数据处理能力；
    所述获取单元在接收所述锚点基站根据所述终端上下文信息请求消息发送的所述终端的终端上下文信息时，用于：
    接收所述锚点基站在确定所述下行小数据包的数据量满足所述非锚点基站的最大数据处理能力后发送的所述终端的终端上下文信息。
  51. 根据权利要求49所述的方法，其中，所述获取单元在向所述锚点基站发送终端上下文信息请求消息后，还用于：
    接收所述锚点基站在确定所述下行小数据包的数据量不满足所述非锚点基站的最大数据处理能力后发送的所述终端的全量上下文信息以及下行小数据包；
    所述发送单元还用于，根据所述终端的全量上下文信息转换为新锚点基站，并向所述 终端发送RRC恢复消息，以使所述终端将RRC Inactive状态恢复至RRC Connected状态；根据所述终端的全量上下文信息对下行小数据包进行第一处理和第二处理后发送给所述终端。
  52. 一种处理器可读存储介质，其中，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行权利要求1-4、5-13或14-17任一项所述的方法。
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