CN116686385A - Communication method and device - Google Patents

Abstract

An embodiment of the present application provides a communication method and device, the method including: sending a first message to a network device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding Feedback message, the second message is a message transmitted during the SDT process. Use the first indication information to inform the network device whether there is a corresponding feedback message for the second message transmitted during the SDT process, thereby preventing the network device from releasing the terminal device as a non-connection because it is not clear whether the second message has a corresponding feedback message state, so as to cause unnecessary overhead caused by the subsequent need to re-paging and re-establish connections, effectively saving system resources.

Description

Communication method and device technical field

The present application relates to the communication field, and in particular to a communication method and device.

Background technique

In the field of communication, for the terminal equipment (User Equipment, UE) with small amount of data and low transmission frequency, in order to avoid unnecessary power consumption and signaling consumption, the research of Small Data Transmission (SDT) is currently proposed .

During the SDT process, for some paired messages, after the UE uses SDT to send the uplink message, because the network device does not know that the network element will send the corresponding downlink message to the UE, the UE may be released to the inactive state. If the network element needs to feed back downlink messages to the UE, it needs to page the UE again, and then the UE initiates a connection recovery request to enter the connection state, so as to receive the downlink messages sent by the network.

Therefore, based on the current SDT process, when sending a downlink message to the UE, it is necessary to re-page the UE and establish a connection, which will cause unnecessary overhead.

Contents of the invention

Embodiments of the present application provide a communication method and device, so as to avoid unnecessary overhead of the current SDT process.

In the first aspect, the embodiment of the present application provides a communication method, including:

sending a first message to the network device, where the first message includes first indication information, the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second message is the messages transmitted.

In the second aspect, the embodiment of the present application provides a communication method, including:

receiving the first message sent by the terminal device, wherein the first message includes first indication information, the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second message is messages in the process.

In a third aspect, the embodiment of the present application provides a communication device, including:

A sending module, configured to send a first message to a network device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second Messages are messages transmitted during the SDT.

In a fourth aspect, the embodiment of the present application provides a communication device, including:

A receiving module, configured to receive a first message sent by a terminal device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the first The second message is the message transmitted during the SDT.

In a fifth aspect, the embodiment of the present application provides a terminal device, including: a transceiver, a processor, and a memory;

the memory stores computer-executable instructions;

The processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method as described in the first aspect above.

In a sixth aspect, the embodiment of the present application provides a network device, including: a transceiver, a processor, and a memory;

the memory stores computer-executable instructions;

The processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method as described in the second aspect above.

In the seventh aspect, the embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, they are used to implement the above first aspect or The communication method as described in the second aspect above.

In an eighth aspect, an embodiment of the present application provides a computer program product, including a computer program, wherein, when the computer program is executed by a processor, the communication method described in the first aspect or the second aspect above is implemented.

An embodiment of the present application provides a communication method and device, the method including: sending a first message to a network device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding Feedback message, the second message is a message transmitted during the SDT process. Use the first indication information to inform the network device whether there is a corresponding feedback message for the second message transmitted during the SDT process, thereby preventing the network device from releasing the terminal device as a non-connection because it is not clear whether the second message has a corresponding feedback message state, so as to cause unnecessary overhead caused by the subsequent need to re-paging and re-establish connections, effectively saving system resources.

Description of drawings

FIG. 1 is a schematic diagram of a communication scenario provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a 5G network architecture;

Figure 3 is a schematic diagram of a 5G network architecture based on a service interface in a non-roaming scenario;

FIG. 4 is a schematic diagram of the implementation of the EDT process provided by the embodiment of the present application;

FIG. 5 is a schematic diagram of the process of data transmission using PUR provided by the embodiment of the present application;

FIG. 6 is a flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of the corresponding relationship between the index value carried by the BSR and the byte size provided by the embodiment of the present application;

FIG. 8 is a schematic diagram of an implementation of the BSR proposed in the embodiment of the present application;

FIG. 9 is a schematic diagram of another implementation of the BSR proposed in the embodiment of the present application;

FIG. 10 is a schematic diagram of a possible implementation of the MAC sub-header provided by the embodiment of the present application;

FIG. 11 is a first schematic diagram of implementation of the first indication information in the BSR provided by the embodiment of the present application;

FIG. 12 is a second schematic diagram of the implementation of the second indication information in the BSR provided by the embodiment of the present application;

FIG. 13 is a third schematic diagram of the implementation of the first indication information in the BSR provided by the embodiment of the present application;

FIG. 14 is a schematic diagram 4 of realizing the first indication information in the BSR provided by the embodiment of the present application;

FIG. 15 is a schematic diagram of the fifth implementation of the first indication information in the BSR provided by the embodiment of the present application;

FIG. 16 is a sixth schematic diagram of the implementation of the first indication information in the BSR provided by the embodiment of the present application;

Fig. 17 is a schematic diagram 7 of the implementation of the first indication information in the BSR provided by the embodiment of the present application;

FIG. 18 is an eighth schematic diagram of the implementation of the first indication information in the BSR provided by the embodiment of the present application;

FIG. 19 is a second schematic flow diagram of the communication method provided by the embodiment of the present application;

FIG. 20 is a first structural schematic diagram of a communication device provided by an embodiment of the present application;

FIG. 21 is a second schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 22 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

FIG. 23 is a schematic structural diagram of a network device provided by an embodiment of the present application.

Detailed ways

For ease of understanding, the concepts involved in this application are explained first.

Terminal device: It can be a device that includes wireless transceiver functions and can cooperate with network devices to provide users with communication services. Specifically, the terminal equipment may refer to user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, User Agent or User Device. For example, a terminal device may be a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a Handheld devices with communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in future 5G networks or networks after 5G, etc.

Network equipment: a network equipment may be a device used to communicate with a terminal equipment, for example, it may be a Global System for Mobile Communication (Global System for Mobile Communication, GSM) or a Code Division Multiple Access (Code Division Multiple Access, CDMA) communication system The base station (Base Transceiver Station, BTS), also can be the base station (NodeB, NB) in the wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, can also be the evolved type base station (Evolutional Node) in the LTE system B, eNB or eNodeB), or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network side device in a future 5G network or a network after 5G or a future evolved public land mobile network (Public Land Mobile Network, PLMN) network equipment in the network, etc.

The network device involved in this embodiment of the present application may also be called a radio access network (Radio Access Network, RAN) device. The RAN device is connected with the terminal device, and is used to receive the data of the terminal device and send it to the core network device. RAN equipment corresponds to different equipment in different communication systems. For example, in the 2G system, it corresponds to the base station and the base station controller; in the 3G system, it corresponds to the base station and the radio network controller (Radio Network Controller, RNC); Evolutionary Node B (eNB), which corresponds to the 5G system in the 5G system, such as the access network equipment (eg gNB, centralized unit CU, distributed unit DU) in New Radio (NR).

Below, with reference to FIG. 1 , the applicable scenarios of the communication method in this application will be described.

FIG. 1 is a schematic diagram of a communication scenario provided by an embodiment of the present application. Please refer to FIG. 1 , including a network device 101 and a terminal device 102, wireless communication can be performed between the network device 101 and the terminal device 102, wherein the terminal device 102 can communicate with at least one core via a radio access network (Radio Access Network, RAN) network for communication.

Wherein, the communication system may be a Global System of Mobile communication (GSM for short) system, a Code Division Multiple Access (CDMA for short) system, a Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, for short WCDMA) system, Long Term Evolution (LTE for short) system or 5th-Generation (5G for short) system.

Correspondingly, the network device may be a base station (Base Transceiver Station, BTS for short) in a GSM system or a CDMA system, or a base station (NodeB, NB for short) in a WCDMA system, or an evolved base station in an LTE system (evolved NodeB, eNB for short), access point (access point, AP) or relay station, and may also be a base station in the 5G system, etc., which are not limited herein.

The 5G mobile communication system described in this application includes a non-standalone (NSA) 5G mobile communication system and/or a standalone (standalone, SA) 5G mobile communication system. The technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system. The communication system may also be a PLMN network, a device-to-device (device-to-device, D2D) network, a machine-to-machine (machine-to-machine, M2M) network, an IoT network or other networks.

It can be understood that, if the technical solutions of the embodiments of the present application are applied to other wireless communication networks, corresponding names may also be replaced with names of corresponding functions in other wireless communication networks.

The network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. For the evolution of architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

And the communication method provided by this application can be applied in the 5G system, and can also be applied in the evolved packet system (Evolved Packet System, EPS). A corresponding network architecture may include a UE, an access network (access network, AN), a core network, and a data network (Data Network, DN).

Among them, the access network device is mainly used to realize functions such as wireless physical layer functions, resource scheduling and wireless resource management, wireless access control, and mobility management; core network equipment may include management equipment and gateway equipment, and management equipment is mainly used for terminals Device registration, security authentication, mobility management and location management, etc., the gateway device is mainly used to establish a channel with the terminal device, and forward the data packets between the terminal device and the external data network on this channel; the data network can include the network Devices (such as servers, routers, etc.), the data network is mainly used to provide various data services for terminal devices.

The network architecture may be a 5G network architecture. FIG. 2 is a schematic diagram of a 5G network architecture. The 5G system is also called a new wireless communication system, a new access technology (New Radio, NR) or a next-generation mobile communication system.

As shown in Figure 2, the access network in the 5G system can be a radio access network (radio access network, (R)AN), and the (R)AN equipment in the 5G system can be composed of multiple 5G-(R)AN nodes The 5G-(R)AN node may include: a non-3GPP access network such as an access point (access point, AP) of a WiFi network, a next-generation base station (which may be collectively referred to as a new generation wireless access network node (NG- RAN node), where the next-generation base station includes a new air interface base station (NR nodeB, gNB), a new generation of evolved base station (NG-eNB), a central unit (central unit, CU) and a distributed unit (distributed unit, DU) separated form of gNB, etc.), a transmission receive point (transmission receive point, TRP), a transmission point (transmission point, TP) or other nodes.

As shown in Figure 2, the 5G core network (5G core/new generation core, 5GC/NGC) includes access and mobility management function (Access and Mobility Management Function, AMF) network elements, session management function (Session Management Function, SMF) ) network element, user plane function (User Plane Function, UPF) network element, authentication server function (Authentication Server Function, AUSF) network element, policy control function (Policy Control Function, PCF) network element, application function (Application Function, AF) network element, unified data management function (unified data management, UDM) network element, network slice selection function (Network Slice Selection Function, NSSF) network element and other functional units.

The AMF network element is mainly responsible for services such as mobility management and access management. Among them, the AMF network element can also be used for positioning between the UE and the location management function (Location management function, LMF) network element, and between the RAN and the LMF network element. Service messages provide transport.

The SMF network element is mainly responsible for session management, UE address management and allocation, dynamic host configuration protocol functions, selection and control of user plane functions, etc. The UPF is mainly responsible for external connection to the data network (data network, DN) and data packet routing and forwarding on the user plane, packet filtering, and performing quality of service (quality of service, QoS) control related functions. AUSF is mainly responsible for the authentication function of the terminal equipment and so on. PCF network elements are mainly responsible for providing a unified policy framework for network behavior management, providing policy rules for control plane functions, and obtaining registration information related to policy decisions. It should be noted that these functional units can work independently, and can also be combined to realize certain control functions, such as access control and mobility management functions such as access authentication for terminal equipment, security encryption, and location registration, as well as user Session management functions such as establishment, release and modification of plane transmission paths.

Each functional unit in 5GC can communicate through the next generation network (next generation, NG) interface. For example, the UE can transmit control plane messages with the AMF network element through the NG interface 1 (N1 for short), and the RAN device can transmit the control plane message through the NG interface 1 (N1 for short). Interface 3 (N3 for short) establishes a user plane data transmission channel with UPF, AN/RAN equipment can establish a control plane signaling connection with AMF network elements through NG interface 2 (N2 for short), and UPF can communicate with The SMF network element performs information exchange, the UPF can exchange user plane data with the data network DN through the NG interface 6 (referred to as N6), and the AMF network element can perform information exchange with the SMF network element through the NG interface 11 (referred to as N11), and the SMF network element can Information exchange is performed with the PCF network element through the NG interface 7 (N7 for short), and the AMF network element can perform information exchange with the AUSF through the NG interface 12 (N12 for short). It should be noted that FIG. 2 is only an exemplary architecture diagram, and besides the functional units shown in FIG. 2 , the network architecture may also include other functional units.

The network architecture shown in Figure 2 is based on a reference point network architecture, and the network architecture is a network architecture in a non-roaming scenario. Of course, the method of the present application can also be applied in a roaming scenario, and the network architecture is not limited to a reference point-based network. architecture, or a network architecture based on service-oriented interfaces.

Figure 3 is a schematic diagram of a 5G network architecture based on a service-based interface in a non-roaming scenario. As shown in Figure 3, in a scenario based on a service-based interface, the core network of the 5G system also includes NEF and NRF network elements. In the scenario based on the service interface, some network elements in the 5G core network are connected through the bus, as shown in Figure 3, AUSF network elements, AMF network elements, SMF network elements, AF network elements, UDM, PCF network elements, network The storage function (Network Repository Function, NRF) network element, the Network Exposure Function (Network Exposure Function, NEF) network element and the NSSF network element are interconnected through a bus, and when the network elements are interconnected through the bus, a service interface is used, for example , the AUSF network element is connected to the bus through the Nausf interface, the AMF network element is connected to the bus through the Namf interface, the SMF network element is connected to the bus through the Nsmf interface, the AF network element is connected to the bus through the NAF network element interface, and the UDM uses the Nudm The interface is connected to the bus, the PCF network element is connected to the bus through the NPCF network element interface, the NRF is connected to the bus through the Nnrf interface, the NEF is connected to the bus through the Nnef interface, and the NSSF is connected to the bus through the Nnssf interface.

The network architecture and business scenarios described above in the embodiments of the present application are for the purpose of more clearly explaining the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. Those of ordinary skill in the art know that With the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

On the basis of the above introduction, the relevant technical background of the application is described below:

In order to enable efficient transmission of small data, LTE introduces an early data transmission (early data transmission, EDT) technology. The UE can perform data transmission in a random access procedure (such as a four-step random access procedure (4-step RACH), that is, a UE in a non-connected state (that is, an idle state or an inactive state) can perform RRC state switching without performing RRC state switching. Data transmission can be completed under certain circumstances, and this kind of data transmission in the random access process is EDT.

During the EDT process, the UE may remain in the idle state (idle) or suspend state (suspend) or inactive state (inactive) to complete the transmission of uplink and/or downlink small data packets. For example, EDT can be understood in conjunction with Figure 4 process, FIG. 4 is a schematic diagram of the implementation of the EDT process provided by the embodiment of the present application.

Wherein, the EDT process, for example, can be completed in a random access (random access, RA) process, see FIG. 4:

1. The UE may send a random access preamble (random access preamble) to the eNB.

Wherein, the random access preamble may also be referred to as a random access preamble sequence, or a preamble, or a preamble sequence.

In a possible implementation manner, the random access preamble and the time-frequency resources occupied by sending the random access preamble are referred to as physical random access channel (physical random access channel, PRACH) resources.

Optionally, the terminal device may select a PRACH resource and select a preamble, and send the selected preamble on the selected PRACH resource. If the random access method is non-contention-based random access, the network device can specify the PRACH resource and preamble, and the network device can estimate the timing advance (timing advance, TA) based on the preamble sent by the terminal device, and the terminal device transmits The uplink authorization size required by Msg3. For example, a network device may broadcast available PRACH resources through system information.

2. The eNB may send a random access response (random access response, RAR) to the UE.

Among them, RAR can include the following information:

The subheader of the RAR includes a back-off indicator (BI), which is used to indicate the back-off time for retransmitting the Msg1.

RAPID in RAR: The preamble index received by the network response.

The payload (payload) of the RAR includes a timing advance group (timing advance group, TAG), which is used to adjust the uplink timing.

Uplink (up link, UL) grant: used to schedule the uplink resource indication of Msg3.

Temporary cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI): used for scrambling the PDCCH of Msg4.

If the terminal device receives the PDCCH scrambled by the RAR-RNTI, and the RAR contains the preamble index sent by itself, the terminal device considers that it has successfully received the random access response.

For random access based on non-contention, after the terminal device successfully receives Msg2, the random access process ends. For contention-based random access, after successfully receiving Msg2, the terminal device needs to continue to transmit Msg3 and receive Msg4.

3. The UE may send an RRC Connection Resume Request (RRCConnectionResumeRequest) to the eNB.

Among them, the RRC connection recovery request includes: recovery ID (resumeID), recovery reason (signaling initiated by the terminal, data originated by the terminal, abnormal data originated by the terminal or terminal call terminated) and short message integrity authentication Code (ShortResumeMAC-I) and other information.

At the same time, the UE may send uplink data (Uplink data) while sending the RRC connection recovery request.

4. The eNB may send an RRC connection release message (RRCConnectionRelease) to the UE.

The RRC connection release message may include: release cause (releaseCause), resume ID (resumeID), and network color code (Network Color Code, NCC).

Meanwhile, the eNB may send downlink data (Downlink data) while sending the RRC connection release message.

It can be understood that after the eNB sends the RRC connection release message to the UE, the UE can enter the inactive state (inactive), so for the above-mentioned EDT process, the UE does not actually enter the connection state, and the small data packet is completed. transmission.

It can be understood that the embodiment of the EDT process at the media access control layer (media access control, MAC) layer mainly affects the random access process. According to the original random access process, message 1 (Msg1) sends a preamble (preamble) for timing advance (timing advance, TA) measurement and request, and message 2 (Msg2) allocates uplink grant (UL grant) and TA , message 3 (Msg3) transmits the uplink common control channel (common control channel, CCCH), and generally in this case is an RRC connection establishment request or RRC connection recovery request, and message 4 (Msg4) performs contention resolution. In EDT, since data transmission without state transition is required, user data is directly sent in Msg3, and downlink data can be sent in Msg4.

In terms of configuration, the network will configure a maximum transmission block size (TB size) that the current network allows transmission on SIB2, where SIB is (system information block, system information block), and the UE can determine the amount of data to be transmitted, for example, If it is smaller than the maximum TB size broadcasted, the UE can initiate EDT transmission; otherwise, the UE uses the normal connection establishment process and enters the connected state to transmit data.

Therefore, EDT can transmit small data (such as automatic reporting of water meters, etc.) through a simple signaling process for UEs in a non-connected state (ie idle state or inactive state) to avoid RRC state changes and RRC Signaling overhead.

The above describes the EDT process in conjunction with FIG. 4 , and the following describes the method for the UE to use the preconfigured uplink resource (Preconfigured Uplink Resource, PUR) for data transmission in the IDLE state.

In LTE Release16, for Narrow Band Internet of Things (NB-IoT) and Enhanced Machine Type Communication (EnhanceMachine Type Communication, eMTC) scenarios, the use of preconfigured uplink resources (Preconfigured Uplink Resource, PUR ) method for data transmission.

Among them, the PUR is only valid in the currently configured cell, that is, when the UE detects a cell change and initiates random access in the new cell, the UE needs to release the PUR configured in the original cell.

It can be understood that the PUR transmission process is similar to the EDT process in LTE described above, except that the process of sending a random access preamble to obtain TA and UL grant (uplink grant) is omitted.

The process of data transmission using PUR can be understood in conjunction with FIG. 5 , which is a schematic diagram of the process of data transmission using PUR provided in the embodiment of the present application.

Referring to Figure 5, if the UE has valid PUR resources, the UE can directly send an RRC connection recovery request to the eNB, and the RRC connection recovery request includes information such as recovery ID, recovery reason, and short message integrity authentication code. At the same time, the UE can send uplink data while sending the RRC connection recovery request.

Afterwards, the eNB may send an RRC connection release message to the UE, and the RRC connection release message may include: release reason, recovery ID, and NCC. At the same time, the eNB may send downlink data and a timing advance command (Time Advance Command, TAC) while sending the RRC connection release message.

Therefore, as long as there are valid PUR resources in the UE, the UE can perform data transmission based on the PUR resources. An important prerequisite for the UE to perform data transmission using the PUR is to have an effective timing advance (Time Advance, TA).

Here is a brief introduction to TA. An important feature of uplink transmission is that different UEs perform time-frequency orthogonal multiple access (orthogonal multiple access), that is, uplink transmissions from different UEs in the same cell do not interfere with each other.

In order to ensure the orthogonality of uplink transmission and avoid intra-cell interference, the eNodeB requires that signals from different UEs in the same subframe but with different frequency domain resources (different RBs) arrive at the eNodeB at basically the same time. As long as the eNodeB receives the uplink data sent by the UE within the scope of the CP (Cyclic Prefix), it can correctly decode the uplink data. Therefore, uplink synchronization requires that the signals from different UEs in the same subframe arrive at the eNodeB before the CP. Inside.

In order to ensure time synchronization at the receiving side (eNodeB side), LTE proposes a timing advance (Timing Advance) mechanism.

From the perspective of the UE side, TA is essentially a negative offset (negative offset) between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. By appropriately controlling the offset of each UE, the eNodeB can control the time when uplink signals from different UEs arrive at the eNodeB. For a UE that is farther away from the eNodeB, due to a larger transmission delay, it needs to send uplink data earlier than a UE that is closer to the eNodeB.

Specifically, the UE can receive TAC from the network device side, where TCA is a timing advance command, and the eNB informs the UE of the timing advance (TA) time by sending TAC to the UE, where TA is the specified timing advance, generally used For the UE's uplink transmission, in order to get the UE's uplink packet to reach the eNB at the desired time, estimate the radio frequency transmission experiment caused by the distance, and send the data packet in advance of the corresponding time.

Therefore, the UE can adjust the transmission time of uplink data based on the TAC. The purpose is to eliminate different transmission delays between UEs, align the arrival times of uplink signals of different UEs at the eNB, ensure uplink orthogonality, and reduce intra-cell interference.

Based on the above introduction, it can be determined that an important prerequisite for the UE to perform data transmission using PUR is to have a valid TA. According to the protocol, the conditions for judging whether the TA is valid include at least one of the following:

- TA timer (Timing Advance timer, TAT) is running; and/or

- The change (increase or decrease) of the Reference Signal Receiving Power (RSRP) is not greater than/less than the set threshold;

Wherein, the configuration of the TAT, as a part of the PUR configuration, can be sent to the UE through the RRCConnectionRelease message.

The radio resource control (Radio Resource Control, RRC) layer instructs the MAC layer to apply or release the corresponding configuration according to the configuration information of the TAT. After receiving the RRCConnectionRelease message, RRC judges whether pur-Config (pre-configured uplink resource configuration) is included. If it is not included, the UE will keep the existing configuration unchanged and TAT will not restart; if it is included, RRC will execute according to the pur-Config configuration. One of the following actions:

In a possible implementation, if pur-Config is set to setup (setup), the UE stores or replaces the PUR configuration. Specifically, if pur-Config contains pur-TimeAlignmentTimer (PUR-TA timer), the RRC The layer instructs the lower layer to apply the pur-TimeAlignmentTimer; if there is no pur-TimeAlignmentTimer in the pur-Conig, the RRC layer instructs the lower layer to release the current pur-TimeAlignmentTimer;

In another possible implementation, if the pur-Config is set to release (release), the UE releases the PUR configuration and instructs the lower layers to release the current pur-TimeAlignmentTimer.

Or, if the network does not give a display indication, and the UE currently has pre-configured resources, the default behavior of the UE is to maintain (maintain) the current configuration after receiving the RRC release.

Specifically, the TAT in PUR transmission is maintained by the media access control (media access control, MAC) layer. If the MAC layer receives the pur-TimeAlignmentTimer configured by the upper layer, it starts or restarts the timer; if the MAC layer receives the upper layer and releases the pur -TimeAlignmentTimer indication, stop the timer.

In addition, in addition to starting or restarting the timer according to high-layer instructions, the MAC also needs to start or restart the timer according to the received TAC MAC CE or the time adjustment value indicated by the PDCCH.

The EDT process and the method of data transmission based on PUR resources are introduced above, and the related implementation of Small Data Transmission (SDT) in R17 will be described below.

In the 5G NR system, there are three RRC states, namely: RRC_IDLE (RRC idle state), RRC_INACTIVE (RRC inactive state), and RRC_CONNECTED (RRC connected state).

The RRC_INACTIVE state is a new state introduced by the 5G system from the perspective of energy saving. For the UE in the RRC_INACTIVE state, the radio bearer and all radio resources will be released, but the UE side and the base station side retain the UE access context to quickly restore the RRC connection. Typically, UEs with infrequent data transmission are kept in the RRC_INACTIVE state.

Before Rel-16, the UE in the RRC_INACTIVE state does not support data transmission. When the uplink (Mobile Original, MO) or downlink (Mobile Terminated, MT) data arrives, the UE needs to restore the connection and release it to the INACTIVE state after the data transmission is completed. . For UEs with small amount of data and low transmission frequency, such a transmission mechanism will cause unnecessary power consumption and signaling overhead.

Therefore, Rel-17 set up a project to carry out research on Small Data Transmission (SDT) under RRC_INACTIVE. The project goals mainly have two directions: uplink small data transmission based on random Uplink small data transmission of pre-configured resources (such as CG type1).

The implementation process of the SDT is similar to the implementation process of the EDT introduced above, and will not be repeated here.

R17 positioning enhancements include support for positioning in the inactive state, and the positioning-related location service (location service, LCS) message and LTE positioning protocol (LTE positioning protocol, LPP) message sent by the UE in the inactive state are based on the above SDT technology Transmission. At present, the following conclusions have been reached on the LPP news and LSC news:

- Any uplink LCS or LPP message can be transmitted in RRC_INACTIVE state from RAN2 perspective, but depends on the amount of data supported by the AS layer. That is, RAN2 does not specify restrictions on message types.

- Further study (For Further Study, FFS) if LPP needs to choose transport, i.e. if it needs to submit the message to the lower layer that decides how to deliver the message (SDT, change state, etc.).

- FFS if RRC state is exposed to LPP.

(WA: Any uplink LCS or LPP message can be transported in RRC_INACTIVE from RAN2 perspective, subject to the data volume supported by AS layers. I.e. RAN2 do not specify a restriction on message type.

FFS if LPP needs to select transport, i.e. if the message is just submitted to lower layers which decide how to deliver it (SDT, change state, etc.).

FFS if RRC state is exposed to LPP.)

Based on the relevant content introduced above, the problems existing in the related technologies are explained below:

There are paired messages in the SDT process, such as paired LPP messages and/or paired LCS messages, etc. The paired messages mean that there are corresponding uplink messages and downlink messages for the messages. For these paired messages, after the UE uses SDT to send the uplink, because the network equipment does not know that the network elements of the core network will also send downlink to the UE, the UE may be released to the inactive state.

For example, for paired LPP messages and/or paired LCS messages, the network device does not know that the LMF network element will send corresponding downlink data to the UE, and will release the UE to the inactive state. Then when the LMF feeds back the downlink message to the UE, it needs to go through the RAN paging (RAN paging) method again, such as paging the UE, and then after the UE initiates a resume request to enter the connected state, the network sends the corresponding information, which will cause inconvenience. necessary overhead.

Aiming at the problems in related technologies, this application proposes the following technical idea: by sending a first message to a network device, the first message includes first indication information, and the first indication information is used to indicate whether the second message transmitted by the current SDT is There is a corresponding feedback message. When there is feedback, the network device can keep the terminal device in the SDT process, that is, it does not release the UE to return to the RRC inactive state, thereby avoiding the inconvenience caused by paging and re-establishing the connection. necessary overhead.

The communication method provided by the present application will be described in detail below in combination with specific embodiments, and FIG. 6 is a flow chart of the communication method provided by the embodiment of the present application.

As shown in Figure 6, the method includes:

S601. Send a first message to the network device, where the first message includes first indication information, the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second message is a message transmitted during the SDT process .

In this embodiment, the terminal device may send a first message to the network device, and the first message includes first indication information, and the first indication information may inform the network device whether there is a corresponding feedback message.

Wherein, the second message is a message transmitted during the SDT process, and the second message may be, for example, the LPP message, LCS message, or RRC message introduced above, or any message transmitted during the SDT process. The embodiment does not limit this.

In a possible implementation, the second message may be a paired message, for example, and the first indication information may indicate that there is a corresponding feedback message for the second message, and the terminal device may maintain the current state, that is to say, the terminal device temporarily Do not enter the inactive state, because the terminal device has not entered the inactive state, so the subsequent network device can directly send the feedback message corresponding to the second message to the terminal device, thereby avoiding the need for subsequent paging of the terminal device, and the terminal device still Unnecessary overhead caused by the need to restore the connection.

In another possible implementation, for example, the second message may not be a paired message, for example, the second message is only an uplink message and no corresponding feedback is required, then the first indication information may indicate that the second message does not exist The corresponding feedback message, the network device can release the terminal back to the inactive state, or the terminal device automatically enters the inactive state, because the terminal device does not need to receive the feedback message of the second message in the future, and there is no need to perform the above search. The call has been resumed and other operations.

Wherein, an example of a corresponding feedback message for the second message is as follows:

For example, if the second message is a RequestCapabilities message, the corresponding feedback message of the second message can be a ProvideCapabilities message; for another example, the second message is a RequestAssistanceData message, then the first The feedback message corresponding to the two messages may be a provide assistance data message (ProvideAssistanceData message).

It can be understood that there is a corresponding feedback message for the second message. In other words, after sending the uplink message to the network device, the network device needs to give a certain feedback for the uplink message. The specific second message and the second message correspond to The specific implementation manner of the feedback message can be selected according to actual requirements, which is not particularly limited in this embodiment.

Therefore, in this embodiment, by sending the first message including the first indication information to the network device, the first indication information can indicate whether there is a corresponding feedback message for the second message, so that the network device can effectively determine whether the terminal device needs to Entering the inactive state, when there is a corresponding feedback message for the second message, the network device will not instruct the terminal device to enter the inactive state immediately, so that the first message can be received without re-paging and connection restoration. The feedback message corresponding to the second message can save unnecessary overhead.

The communication method provided by the embodiment of the present application includes: sending a first message to a network device, wherein the first message includes first indication information, the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second Messages are messages transmitted during the SDT. Use the first indication information to inform the network device whether there is a corresponding feedback message for the second message transmitted during the SDT process, thereby preventing the network device from releasing the terminal device as a non-connection because it is not clear whether the second message has a corresponding feedback message state, so as to cause unnecessary overhead caused by the subsequent need to re-paging and re-establish connections, effectively saving system resources.

On the basis of the foregoing embodiments, several possible implementation manners of the first message and the first indication information are respectively introduced below.

In a possible implementation manner, the first message may be, for example, a buffer status report (Buffer Status Report, BSR).

Here is a brief introduction to BSR first:

When the UE needs to send data to the network side, it must have an uplink grant resource. If there is no uplink resource, it needs to apply to the network side first. In a possible implementation, the UE can send a BSR to the network side To apply for uplink resources, wherein, the UE can insert a BSR control unit into the MAC layer protocol data unit (Protocol Data Unit, PDU) to tell the network side: how much data does one or some of my logical channel groups currently need? Send, I hope you can allocate some uplink resources to me.

Therefore, the BSR can apply for resources from the network side for data upload by the UE. After receiving the BSR, the network allocates appropriate resources to the UE according to the content carried in the BSR.

At present, in the protocol, the BSR information is encoded in the following manner: using 64 indexes (index) from 0 to 63 to represent different byte ranges. In this way, no matter how much data the UE needs to send, the BSR only needs 6 bits of space, which reduces the number of bits transmitted over the air interface.

The corresponding relationship between the index value carried by the BSR and the byte size is specifically shown in FIG. 7 , and FIG. 7 is a schematic diagram of the corresponding relationship between the index value carried by the BSR and the byte size provided in the embodiment of the present application.

As shown in Figure 7, the value of the buffer size (Buffer Size, BS) corresponding to each index value carried by the BSR is given in Figure 7, where the unit of BS is byte (byte)

For example, referring to FIG. 7, the BS corresponding to index=0 is 0, indicating that a certain logical channel group has no data to be sent, and the BS corresponding to index=63 is greater than 150000, indicating that a certain logical channel group has more than 150K bytes of data to be sent. Then when the UE has 30 bytes of data to send, it only needs to fill in the value of the BSR control element as 8. After decoding the BSR information, the network side finds that the value of the BSR is equal to 8, and knows that the amount of data to be sent by the UE side is between 26 and 31 bytes, which provides a reference for the eNB to allocate resources of an appropriate size to the UE.

At the same time, in order to reduce the number of information bits transmitted in the air interface, the protocol does not bind a BSR value for each logical channel, but binds a BSR value for each logical channel group. Logical Channel Group (Logic Channel Group, LCG for short), as the name implies, is to group one or more logical channels into one group.

Based on the above introduction, it can be determined that the BSR carries 64 index values ranging from 0 to 63, and each index value corresponds to the number of bytes in different ranges. This number of bytes is not all the data to be transmitted by the UE, nor is it The number of data bytes to be transmitted by a logical channel, but the amount of data to be transmitted by a logical channel group. Each logical channel group has a BSR value bound to it. When a certain logical channel group of the UE needs to send data, it can report the BSR value of the logical channel group.

When RRC configures each logical channel attribute parameter (logicalChannelConfig), it can assign a corresponding LCG ID number (logicalChannelGroup) to the logical channel. The ID number ranges from 0 to 7, that is to say, there are 8 logical channel groups in total.

Currently, the BSR control element (control element, CE) reported by the UE can have the following four formats:

Short BSR format (fixed size) (Short BSR format (fixed size));

Long BSR format (variable length) (Long BSR format (variable size));

Short Truncated BSR format (fixed size) (Short Truncated BSR format (fixed size));

Long Truncated BSR format (variable size) (Long Truncated BSR format (variable size)).

Wherein, when the format of the BSR is the short BSR format or the truncated BSR format, the BSR control unit occupies 1 byte and can only carry the BSR information of 1 logical channel group. The logical channel group ID corresponding to the BSR information permanently occupies 2 bits, and takes a value of 0-7, and the BSR field occupies 6 bits, and takes a value of 0-63.

For example, it can be understood with reference to FIG. 8 , which is a schematic diagram of an implementation of a BSR provided in an embodiment of the present application.

As shown in Figure 8, the BSR control unit occupies one byte, that is, 8 bits. In the BSR control unit, the first two bits are the LCG ID (LCG ID), and the last 6 bits are the buffer size (Buffer Size). the corresponding index.

For example, the current value of each bit in the BSR control unit is 01000011, then the first two bits are 0 and 1, and the last 6 bits are 000011, which means that there is 12byte to 14byte data on the logical channel group 1 to be transmitted.

And, when the format of the BSR is the long BSR format or the long truncated BSR format, the number of bytes occupied by the BSR control unit is not fixed, and it can carry BSR information of all logical channel groups. In the current implementation mode, a 1-byte bitmap can be used as the logical channel group indication information, wherein each bit in the bitmap corresponds to a logical channel group, and the value on the bit indicates whether to report the data of the corresponding logical channel group If the number of logical channel groups that need to report the amount of buffered data is m, the length of the BSR control unit is m+1, because the current maximum number of logical channel groups is 8, so the maximum value of m is 8.

For example, it can be understood with reference to FIG. 9 , which is a schematic diagram of another implementation of the BSR provided in the embodiment of the present application.

As shown in Figure 9, the BSR control unit occupies m+1 bytes, where the first byte includes a bitmap, and each bit in the bitmap corresponds to a logical channel group, corresponding to LGC7~LGC0, to indicate whether The data volume of each logical channel group is reported, and the index of the buffer size (BS) corresponding to each logical channel group that needs to report the data volume is included in the following second byte to the m+1th byte.

For example, 1 can be used to indicate that the data volume of the logical channel group needs to be reported, and 0 can be used to indicate that the data volume of the logical channel group does not need to be reported. Assuming that the current bitmap is 11000100, it means that the current BSR control unit includes logical channel group 0 and logical channel group 1 and the buffered data volume of logical channel group 5.

It is worth noting that the truncated BSR described above means that there are currently multiple logical channel group data that need to be reported, but limited to the available filling resources, only part of the logical channel group BSR can be sent, which is called truncation BSR.

Several formats of the BSR have been introduced above. It should also be noted here that the BSR control unit can be included in the MAC PDU, and each MAC PDU corresponds to a MAC sub-header (sub-header). Each MAC sub-header Corresponding to a MAC service data unit (service data unit, SDU), MAC CE (control element) or padding (padding), the type of the BSR can be indicated in the MAC subheader.

The domains and specific meanings contained in each MAC subheader are different. The common domains in the MAC subheader include:

LCID: used to identify the type or padding of the logical channel entity or MAC control element of the MAC SDU.

E (extended field): Indicates whether there is a subsequent field after the MAC subheader located in the MAC header.

R (reserved bit): used for subsequent application expansion, the size is 2bits, because some embodiments of the present invention will utilize reserved bits, so in the embodiments using reserved bits, the bit can be named with different names as required, Such as extended bits and so on.

"F2" and "F" (format field): used to jointly indicate the length of the L field.

L (length indication field): used to indicate the length of the MAC SDU or MAC control unit, the unit is byte.

For example, the MAC subheader can be understood in conjunction with FIG. 10 . FIG. 10 is a schematic diagram of a possible implementation of the MAC subheader provided by the embodiment of the present application.

Referring to FIG. 10 , the MAC subheader may include reserved R bits and extended E bits, and the LCID field in this subheader may be used to indicate the type of the control unit. The four types of BSR introduced above are determined by the LCID value in the subheader.

Figure 10 is only a schematic diagram of a possible implementation of the MAC sub-header. In the actual implementation process, there are other implementations of the MAC sub-header. The specific implementation can be selected according to actual needs. This embodiment does not make special restrictions on this .

Based on the content related to the BSR introduced above, the implementation manner in which the first message is the BSR will be specifically introduced below.

When the first message is a BSR, the first indication information may be implemented in the following ways:

In a possible implementation manner, the preset bit in the BSR is used to indicate the first indication information, and the preset bit is any bit in the reserved bits of the BSR, or the preset bit is the Any one of the extended bits.

Wherein, the reserved bits are the reserved R bits in the MAC subheader introduced above, and the extended bits refer to extending the existing BSR format to add bits for carrying the first indication information. That is, the reserved R bits or extended bits in the BSR format may be used to include the first indication information, wherein, for example, the preset bits may be any one of the reserved bits or extended bits, or the preset bits may also be It may be multiple bits in reserved bits or extended bits, which is not particularly limited in this embodiment.

Wherein, the implementation manner of the first indication information may be, for example:

If the preset bit is the first value, the first indication information indicates that there is a corresponding feedback message for the second message;

If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message.

In this embodiment, when the preset bit is one bit, the first value can be, for example, 1, and the second value can be, for example, 0. For example, it can be understood in conjunction with FIG. 11 and FIG. 12. FIG. Figure 12 is a schematic diagram of implementing second indication information in the BSR provided by the embodiment of the present application.

Referring to FIG. 11, for example, the preset bit may be the first bit in the reserved R bits. Assuming that the current preset bit is 1, the first indication information indicates that there is a corresponding feedback message for the second message; or,

Referring to FIG. 12 , for example, the preset bit may be the first bit in the reserved R bits. Assuming that the current preset bit is 0, the first indication information indicates that there is no corresponding feedback message for the second message.

Alternatively, the first value and the second value may also be arbitrarily selected preset values, which are not limited in this embodiment.

And, when the preset bits are multiple bits, the first value can be, for example, 11, and the second value can be, for example, 00. For example, it can be understood in conjunction with FIG. 13 and FIG. 14, and FIG. 13 is provided by the embodiment of the present application Schematic diagram 3 for realizing the first indication information in the BSR, and FIG. 14 is a schematic diagram 4 for realizing the first indication information in the BSR provided by the embodiment of the present application.

Referring to FIG. 13, for example, the preset bits may be two bits in the reserved R bits. Assuming that the current preset bits are 11, the first indication information indicates that there is a corresponding feedback message for the second message; or,

Referring to FIG. 14 , for example, the preset bits may be two bits in the reserved R bits. Assuming that the current preset bits are 00, the first indication information indicates that there is no corresponding feedback message for the second message.

Or, for example, the first value can be 01, and the second value can be 10, etc., when the preset bit is a larger number of bits, the first value and the second value can also be adaptively set up.

This embodiment does not limit the implementation of the first value and the second value, as long as the preset bit is set to the first value, the first indication information indicates that there is a corresponding feedback message for the second message, and the preset bit is the first value In the case of two values, the first indication information only needs to indicate that there is no corresponding feedback message for the second message. In the actual implementation process, the specific implementation manners of the first value and the second value can be selected according to actual needs.

When the first message is a BSR, the first indication information may also have the following implementation methods:

In a possible implementation manner, a specific logical channel group identifier may be used to indicate the first indication information, because in the SDT process, only part of the data resource bearer (Data Resource Bearer, DRB)/signaling resource bearer (Signal Resource Bearer) Bearer, SRB) can support the SDT process in the inactive state, that is to say, only some DRBs/SRBs will be resumed in the inactive state to transmit corresponding data or signaling, then the first indication information can be, for example, a DRB that does not support SDT It is represented by the ID of the logical channel group where it is located.

Based on the above introduction, it can be determined that in the existing BSR format, 3 bits can be used to display the logical logical channel group ID, or an 8-bit bitmap can be used to indicate whether the corresponding logical channel group has transmission data.

Then, in a possible implementation manner, when the format of the BSR is the short BSR format or the truncated BSR format, the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR is used to indicate the first indication information.

Wherein, if the logical channel group identifier is the identifier of the first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the first logical channel group is a small Logical channel group for the data transmission SDT process.

For example, it can be understood in conjunction with FIG. 15 , which is a fifth schematic diagram of implementation of the first indication information in the BSR provided in the embodiment of the present application.

The 3bit used to indicate the LGC ID in the BSR in Figure 15 is "010", which means that the logical channel group currently included is logical channel group 3, because there are only DRBs corresponding to logical channels in logical channel group 1 and logical channel group 2 It supports SDT transmission, then when the UE sends the BSR of logical channel group 3, the first indication information can indicate that there is a corresponding feedback message for the second message, and when the network device receives this BSR, based on the logical channel group 3 The identification , it will be considered that the currently received second message has corresponding downlink feedback, and will not instruct the UE to immediately enter the inactive state.

In the actual implementation process, the identifier of any logical channel group that does not support the small data transmission SDT process of the terminal device in the inactive state can be used to indicate that there is a corresponding feedback message for the second message. The specific implementation method can be The selection is made according to actual requirements, which is not particularly limited in this embodiment.

Or, if the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group is an SDT that supports the terminal device in an inactive state The logical channel group for the process.

For example, it can be understood in conjunction with FIG. 16 , which is a sixth schematic diagram of implementation of the first indication information in the BSR provided in the embodiment of the present application.

The 3bit used to indicate the LGC ID in the BSR in Figure 16 is "001", which means that the logical channel group currently included is logical channel group 1, because there are only DRBs corresponding to logical channels in logical channel group 1 and logical channel group 2 It supports SDT transmission, then when the UE sends the BSR of logical channel group 1, the first indication information can indicate that there is no corresponding feedback message for the second message. When the network device receives this BSR, based on the logical channel group 1 ID, it will be considered that the currently received second message has no corresponding downlink feedback, and the network device can release the UE back to the inactive state, or the terminal device will automatically enter the inactive state.

In the actual implementation process, the identification of any logical channel group that supports the small data transmission SDT process of the terminal device in the inactive state can be used to indicate that there is no corresponding feedback message for the second message. The specific implementation method can be The selection is made according to actual requirements, which is not particularly limited in this embodiment.

The above describes the implementation of the short BSR format or the short truncated BSR format. In another possible implementation, when the BSR format is the long BSR format or the long truncated BSR format, the BSR includes each logical channel group Bits corresponding to each identification are identified, and bits corresponding to each logical channel group identification are used to indicate the first indication information.

In a possible implementation manner, if the bit corresponding to any first logical channel group is the third value, the first indication information indicates that there is a corresponding feedback message for the second message, where the first logical channel group is not Logical channel group that supports the SDT process of the terminal equipment in the inactive state.

Assuming that the third value can be 1, for example, it can be understood in conjunction with FIG. 17 , which is a schematic diagram 7 of the implementation of the first indication information in the BSR provided by the embodiment of the present application.

The 8-bit bitmap used to indicate the LGC ID in the BSR in Figure 17 is "00001000", which means that the value of the bit corresponding to the current logical channel group 3 is 1, because there are only logical channels in logical channel group 1 and logical channel group 2 The corresponding DRB supports SDT transmission, then when the UE sends a BSR with bit position 1 of logical channel group 3, the first indication information may indicate that there is a corresponding feedback message for the second message, and when the network device receives this BSR, Based on the identifier of the logical channel group 3, it will be considered that the currently received second message has corresponding downlink feedback, and the UE will not be instructed to immediately enter the inactive state.

In the actual implementation process, any number of bits corresponding to logical channel groups that do not support the small data transmission SDT process of the terminal device in the inactive state can be set to the third value, which is used to indicate that there is corresponding feedback for the second message For example, the bits corresponding to LGC3, LGC4, and LGC5 can also be set to a third value at the same time, and its specific implementation method can be selected according to actual needs. This embodiment does not specifically limit this, and the third value is in addition to In addition to the "1" introduced above, it can also be any preset value, which is not particularly limited in this embodiment, and can be selected according to actual needs.

Alternatively, if the bits corresponding to each first logical channel group are all the fourth value, the first indication information indicates that there is no corresponding feedback message for the second message.

Assuming that the fourth value may be 0, for example, it can be understood in conjunction with FIG. 18 . FIG. 18 is an eighth schematic diagram of implementing the first indication information in the BSR provided by the embodiment of the present application.

The 8-bit bitmap used to indicate the LGC ID in the BSR in Figure 18 is "00000000", which means that the values of the bits corresponding to each logical channel group are all 0, because only the logical channels in logical channel group 1 and logical channel group 2 The DRB corresponding to the channel supports SDT transmission, then when the UE sends a BSR in which the bits of logical channel group 0, logical channel group 3 to logical channel group 7 are all set to 0, the first indication information may indicate that the second message does not There is a corresponding feedback message. When the network device receives this BSR, based on the identification of each logical channel group, it will consider that the second message currently received has no corresponding downlink feedback, and the network device can release the UE back to the inactive state. Or the terminal device automatically enters the inactive state.

In an actual implementation process, the fourth value may be any preset value other than the "0" introduced above, which is not particularly limited in this embodiment, and may be selected according to actual requirements.

In another possible implementation, if the bit corresponding to the preset logical channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message in the second message, wherein the preset logical channel group is not supported The logical channel group of the SDT process of the terminal equipment in the inactive state; or,

If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message.

The current implementation is similar to the implementation of any of the first logical channel groups described above, the difference is that currently a preset logical channel group that does not support the SDT process of the terminal device in the inactive state is selected, The first indication information is indicated according to the bit corresponding to the preset logical channel group.

For example, the selected preset logical channel group is LGC3, for example, the fifth value can be 1, and the sixth value can be 0, then when the bit position corresponding to LGC3 is 1, it can be determined that the first indication information indicates the second message There is a corresponding feedback message; when the bit position corresponding to LGC3 is 0, it can be determined that the first indication information indicates that the second message does not have a corresponding feedback message, and in this implementation, there is no need to care about the remaining bits corresponding to LGC , you only need to pay attention to the bits corresponding to LGC3. The specific selection of the preset logical channel group can be selected according to actual needs, as long as the preset logical channel group is a logical channel group that does not support the SDT process of the terminal device in the inactive state That's it.

In an actual implementation process, the implementation manners of the fifth value and the sixth value can also be selected and expanded according to actual needs, which is not particularly limited in this embodiment.

The above describes various possible implementations of the first indication information when the first message is a BSR. In another possible implementation, the first message may also be an RRC message, or the first message may also be an uplink Control information (uplink control information, UCI).

When the first message is an RRC message, for example, the first indication information may be carried in the RRC message, wherein, if the first indication information in the RRC message is the seventh value, the first indication information indicates that there is corresponding feedback in the second message information;

If the first indication information in the RRC message is the eighth value, the first indication information indicates that there is no corresponding feedback message in the second message.

Wherein, the seventh value may be, for example, 1, and the eighth value may be, for example, 0, or they may also be set according to actual needs. This embodiment does not limit the implementation of the seventh value and the eighth value.

In this embodiment, the RRC message may be, for example, an RRC resume request (RRC resume request message), and then, for example, the first indication information carried in the RRC message may be understood in conjunction with the following content, which is the content included in the RRC resume request:

Based on the above content, it can be determined that the requireDLfeedback field is included in the RRC resume request, and this field can be the first indication information. When this field is true, it can indicate, for example, that the first indication information indicates that there is a corresponding feedback message in the second message. and, when this field is false, for example, it may indicate that the first indication information indicates that there is no corresponding feedback message for the second message.

Alternatively, the first indication information carried in the RRC signaling may also be endTransaction. Similarly, for example, when the first indication information is 1, it means that there is a corresponding feedback message for the second message; when the first indication information is 0, it means There is no corresponding feedback message for the second message.

In an actual implementation process, the RRC message may be any possible RRC message other than the RRC resume request described above, and is not limited to the RRC signaling type.

When the first message is an RRC message, in addition to carrying the first indication information in the RRC message described above, in another possible implementation manner, the RRC message may also include a transmission identifier.

If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message;

If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, where the second preset message is a message for which there is no corresponding feedback message.

It can be understood that whether there is a corresponding feedback message for each second message can be determined in advance, then the transmission identifier of each second message can be included in the RRC message, and the network device determines the current transmission by identifying the transmission identifier. When the identifier is the transmission identifier of the second message that has a corresponding feedback message, it will be considered that the currently received second message has a corresponding downlink feedback, and it will not instruct the terminal device to enter the inactive state immediately; or, after determining the current When the transmission identifier is the transmission identifier of the second message that does not have a corresponding feedback message, it will be considered that the currently received second message has no corresponding downlink feedback, and the terminal can be released back to the inactive state, or the terminal device automatically enters the inactive state.

In the actual implementation process, the specific implementation manner of the first message and the specific implementation manner of the first indication information included in the first message can be selected according to actual requirements, and this embodiment does not specifically limit this.

When the first message is UCI, for example, the first indication information may be carried in the UCI information field, wherein if the first indication information in the UCI information field is the seventh value, the first indication information indicates that the second message exists corresponding feedback messages;

If the first indication information in the information field of the UCI is the eighth value, the first indication information indicates that there is no corresponding feedback message for the second message.

Wherein, the seventh value may be, for example, 1, and the eighth value may be, for example, 0, or they may also be set according to actual needs. This embodiment does not limit the implementation of the seventh value and the eighth value.

When the first message is UCI, in addition to carrying the first indication information in the UCI information field described above, in another possible implementation manner, the transmission identifier may also be included in the UCI information field.

If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message;

If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, where the second preset message is a message for which there is no corresponding feedback message.

The UCI in this embodiment may be, for example, a UL grant, or any other possible UCI. When the first message is UCI, its various possible implementations are similar to the implementation of the above RRC message. , which will not be repeated here.

On the basis of the above described embodiments, the communication method provided by this application also includes the following content:

When the first indication information indicates that there is no corresponding feedback message for the second message, the terminal device may directly enter the inactive state, for example, the terminal device may return to the inactive state based on the release of the network device, that is, the network device determines When there is a corresponding feedback message, the terminal device can be released to the inactive state, or the terminal device can also automatically enter the inactive state;

Alternatively, when the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device may enter the inactive state after a preset period of time. Similarly, for example, the terminal device may return to the inactive state based on the release of the network device, that is, It means that when the network device determines that there is a corresponding feedback message for the second message, it releases the terminal device to the inactive state after a preset period of time, or the terminal device can also automatically enter the inactive state.

In a possible implementation, it may be determined based on a timer when the terminal device is released to the inactive state. For example, after the network device receives the second message, it may start the timer. If it is determined that the second message has corresponding feedback message, the network device will not release the UE back to the inactive/idle state during the running of the timer. In this implementation mode, the running of the timer depends on the first indication information, and only when the first indication information indicates that the second message exists When the corresponding feedback message is received, the terminal device enters the inactive state after the first preset time period; otherwise, the terminal device can directly enter the inactive state without waiting for the first preset time period.

In another possible implementation, after the network device receives the second message, the network device starts a timer. During the running of the timer, the network device will not release the UE back to the inactive/idle state. In this implementation In this way, the operation of the timer does not depend on the first indication information, that is to say, no matter whether the first indication information indicates whether there is a corresponding feedback message for the current second message, the terminal device will enter the inactive state after the second preset time length. .

The configuration of the timer may be configured by the network side, and jointly maintained by the UE and the network side, such as being carried in an RRC release message. It can also be implemented by the network side itself. For example, the network determines the preset duration based on the transmission delay between different entities/network elements (gNB, TRP, LMF, etc.) and the processing delay of each network element. There is no limit to the specific implementation of the duration, which can be selected and expanded according to actual needs.

In this embodiment, it is set that when the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device can enter the inactive state after the first preset time period, in order to ensure that the first message after receiving the second message Keep the terminal device from entering the inactive state within the preset time period, or directly set it within the second preset time period after the network device receives the second message, keep the terminal device from entering the inactive state, so as to send the second message The corresponding feedback message of the device has a certain data transmission time, which avoids the need to perform paging and connection recovery operations when the feedback message needs to be sent later. At the same time, when the preset time period arrives, if the first For the feedback message corresponding to the second message, in order to avoid the waiting time process, it is still necessary to release the terminal device to an inactive state.

Therefore, there is another possibility that, during the running of the timer, that is to say, when the first preset duration or the second preset duration is not over, if the network device sends a feedback message corresponding to the second message to the terminal device , the network device may also release the terminal device back to the inactive/idle state after sending the feedback message, because the feedback message corresponding to the second message has been sent to the terminal device at this time, and there is no need to wait any longer.

Meanwhile, the first message in this application is a message transmitted during the SDT process.

In a possible implementation manner, the first message and the second message may be messages sent together, that is to say, they are included in the same message, or the first message and the second message may also be messages sent separately Messages, that is to say, are two independent messages. When they are two independent messages, in principle, the second message should be sent first, and then the first message. In the actual implementation process, the first message And the specific sending manner of the second message may be selected according to actual needs, which is not particularly limited in this embodiment.

And the resources used for transmitting the first message in this application are any of the following: pre-configured resource (Configured grant-SDT, CG-SDT) resources for small data transmission, random access resources for small data transmission (RA-SDT resources), dynamic scheduling resources, and random access resources.

The above-mentioned embodiments introduce the implementation on the terminal device side. The implementation on the network device side will be introduced below with reference to FIG. 19 .

As shown in Figure 19, the method includes:

S1901. Receive the first message sent by the terminal device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second message is transmitted during the SDT process information.

In this embodiment, the network device may receive the first message sent by the terminal device, and may determine whether there is a corresponding feedback message in the second message according to the first indication information in the first message.

If the first indication information indicates that there is no corresponding feedback message for the second message, releasing the terminal device to an inactive state;

If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device is released into an inactive state after a preset period of time.

Various possible implementation manners on the network device side are similar to the foregoing implementation manners on the terminal equipment side, and will not be repeated here.

The communication method provided by the embodiment of the present application includes: receiving a first message sent by a terminal device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message. The second message is the message transmitted during the SDT. By receiving the first message sent by the terminal device, and according to the first indication information in the first message, it is determined whether there is a corresponding feedback message for the second message transmitted during the SDT process, so as to avoid unclear whether there is a corresponding feedback message for the second message The feedback message of the terminal device is released to the non-connected state, which will cause unnecessary overhead caused by subsequent re-paging and re-establishment of the connection, effectively saving system resources.

FIG. 20 is a first structural schematic diagram of a communication device provided by an embodiment of the present application. Referring to FIG. 20, the communication device 200 may include a sending module 2001 and a processing module 2002, wherein,

The sending module 2001 is configured to send a first message to a network device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the first The second message is the message transmitted during the SDT.

In a possible implementation manner, the first message is a buffer status report (BSR).

In a possible implementation manner, the preset bit in the BSR is used to indicate the first indication information, and the preset bit is a bit in the reserved bits of the BSR, or, the The preset bits are bits in the extended bits of the BSR.

In a possible implementation manner, if the preset bit is a first value, the first indication information indicates that there is a corresponding feedback message in the second message;

If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message.

In a possible implementation manner, the format of the BSR is a short BSR format or a truncated BSR format, and the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR is used to indicate the the first instruction information.

In a possible implementation manner, if the logical channel group identifier is an identifier of a first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, where the first The logical channel group is a logical channel group that does not support the small data transmission SDT process of the terminal device in the inactive state; or,

If the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group supports terminal equipment in Logical channel group of the SDT process in the inactive state.

In a possible implementation manner, the format of the BSR is a long BSR format or a long truncated BSR format, and the BSR includes bits corresponding to each logical channel group identifier, and each logical channel group identifier corresponds to a The bits of are used to indicate the first indication information.

In a possible implementation manner, if the bit corresponding to any first logical channel group is a third value, the first indication information indicates that there is a corresponding feedback message for the second message, where the first A logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or,

If the bits corresponding to each of the first logical channel groups have the fourth value, the first indication information indicates that there is no corresponding feedback message for the second message.

In a possible implementation manner, if the bit corresponding to the preset logic channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the preset logic The channel group is a logical channel group that does not support the SDT process of the terminal device in the inactive state; or,

If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message.

In a possible implementation manner, the first message is a radio resource control RRC message, or the first message is UCI.

In a possible implementation manner, if the first indication information in the first message is a seventh value, the first indication information indicates that there is a corresponding feedback message in the second message;

If the first indication information in the first message is the eighth value, the first indication information indicates that there is no corresponding feedback message in the second message.

In a possible implementation manner, the first message includes a transmission identifier;

If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message;

If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, wherein the second preset message is that there is no corresponding feedback message information.

In a possible implementation manner, the RRC message is an RRC connection recovery request message.

In a possible implementation manner, the device also includes:

Processing module 2002, for:

If the first indication information indicates that there is no corresponding feedback message for the second message, the terminal device enters an inactive state;

If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device enters an inactive state after a preset time period.

In a possible implementation manner, the processing module 2002 is further configured to:

After the network device receives the second message for a second preset time period, the terminal device enters an inactive state.

In a possible implementation manner, the first message is a message transmitted during the SDT process.

In a possible implementation manner, the second message is any one of the following: Long Term Evolution Positioning Protocol LPP message, Location Service LCS message, and RRC message.

In a possible implementation manner, the resources used for transmitting the first message are any of the following: pre-configured resources CG-SDT resources for small data transmission, random access resources for small data transmission RA-SDT resources, dynamic scheduling resources, and random access resources.

The communication device provided in the embodiment of the present application can execute the technical solutions shown in the above method embodiments, and its implementation principles and beneficial effects are similar, and will not be repeated here.

FIG. 21 is a second structural schematic diagram of a communication device provided by an embodiment of the present application. Referring to FIG. 21, the communication device 210 may include a receiving module 2101 and a processing module 2102, wherein,

The receiving module 2101 is configured to receive a first message sent by a terminal device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the The second message is a message transmitted during the SDT.

In a possible implementation manner, the first message is a BSR.

In a possible implementation manner, the preset bit in the BSR is used to indicate the first indication information, and the preset bit is a bit in the reserved bits of the BSR, or, the The preset bits are bits in the extended bits of the BSR.

In a possible implementation manner, if the preset bit is a first value, the first indication information indicates that there is a corresponding feedback message in the second message;

If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message.

In a possible implementation manner, the format of the BSR is a short BSR format or a truncated BSR format, and the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR is used to indicate the the first instruction information.

In a possible implementation manner, if the logical channel group identifier is an identifier of a first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, where the first The logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or,

If the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group supports terminal equipment in Logical channel group of the SDT process in the inactive state.

In a possible implementation manner, the format of the BSR is a long BSR format or a long truncated BSR format, and the BSR includes bits corresponding to each logical channel group identifier, and each logical channel group identifier corresponds to a The bits of are used to indicate the first indication information.

In a possible implementation manner, if the bit corresponding to any first logical channel group is a third value, the first indication information indicates that there is a corresponding feedback message for the second message, where the first A logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or,

If the bits corresponding to each of the first logical channel groups have the fourth value, the first indication information indicates that there is no corresponding feedback message for the second message.

In a possible implementation manner, if the bit corresponding to the preset logic channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the preset logic The channel group is a logical channel group that does not support the SDT process of the terminal device in the inactive state; or,

If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message.

In a possible implementation manner, the first message is an RRC message, or, the first message is UCI.

In a possible implementation manner, if the first indication information in the first message is a fifth value, the first indication information indicates that there is a corresponding feedback message in the second message;

If the first indication information in the first message is the sixth value, the first indication information indicates that there is no corresponding feedback message in the second message.

In a possible implementation manner, the first message includes a transmission identifier;

If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message;

If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, wherein the second preset message is that there is no corresponding feedback message information.

In a possible implementation manner, the RRC message is an RRC connection recovery request message.

In a possible implementation manner, the device also includes:

Processing module 2102, for:

If the first indication information indicates that there is no corresponding feedback message for the second message, releasing the terminal device to an inactive state;

If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device is released into an inactive state after a preset period of time.

In a possible implementation manner, the processing module 2102 is also configured to:

After the network device receives the second message for a second preset time period, the terminal device is released into an inactive state.

In a possible implementation manner, the first message is a message transmitted during the SDT process.

In a possible implementation manner, the second message is any one of the following: an LPP message, an LCS message, and an RRC message.

In a possible implementation manner, the resources used for transmitting the first message are any of the following: CG-SDT resources, RA-SDT resources, dynamic scheduling resources, and random access resources.

The communication device provided in the embodiment of the present application can execute the technical solutions shown in the above method embodiments, and its implementation principles and beneficial effects are similar, and will not be repeated here.

FIG. 22 is a schematic structural diagram of a terminal device provided by an embodiment of the present application. Referring to FIG. 22 , a terminal device 220 may include: a transceiver 21 , a memory 22 , and a processor 23 . The transceiver 21 may include: a transmitter and/or a receiver. The transmitter may also be called a transmitter, a transmitter, a sending port, or a sending interface, and similar descriptions, and the receiver may also be called a receiver, a receiver, a receiving port, or a receiving interface, or similar descriptions. Exemplarily, the transceiver 21 , the memory 22 , and the processor 23 are connected to each other through a bus 24 .

The memory 22 is used to store program instructions;

The processor 23 is configured to execute the program instructions stored in the memory, so as to enable the terminal device 20 to execute any communication method shown above.

Wherein, the receiver of the transceiver 21 can be used to perform the receiving function of the terminal device in the above communication method.

FIG. 23 is a schematic structural diagram of a network device provided by an embodiment of the present application. Referring to FIG. 23 , the network device 230 may include: a transceiver 31 , a memory 32 , and a processor 33 . The transceiver 31 may include: a transmitter and/or a receiver. The transmitter may also be called a transmitter, a transmitter, a sending port, or a sending interface, and similar descriptions, and the receiver may also be called a receiver, a receiver, a receiving port, or a receiving interface, or similar descriptions. Exemplarily, the transceiver 31 , the memory 32 , and the processor 33 are connected to each other through a bus 34 .

The memory 32 is used to store program instructions;

The processor 33 is configured to execute the program instructions stored in the memory, so as to enable the terminal device 20 to execute any communication method shown above.

Wherein, the receiver of the transceiver 31 can be used to perform the receiving function of the terminal device in the above communication method.

An embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, the foregoing communication method is implemented.

An embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, the foregoing communication method is implemented.

The embodiment of the present application may further provide a computer program product, the computer program product may be executed by a processor, and when the computer program product is executed, any communication method performed by the terminal device or network device shown above may be implemented.

The communication device, computer-readable storage medium, and computer program product of the embodiments of the present application can execute the communication method performed by the above-mentioned terminal device and network device. For the specific implementation process and beneficial effects, refer to the above, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present application 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.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it implements the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (76)

A communication method applied to a terminal device, characterized in that it includes: sending a first message to the network device, where the first message includes first indication information, the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second message is the messages transmitted. The method according to claim 1, wherein the first message is a buffer status report (BSR). The method according to claim 2, wherein a preset bit in the BSR is used to indicate the first indication information, and the preset bit is a bit in the reserved bits of the BSR , or, the preset bits are bits in the extended bits of the BSR. The method according to claim 3, wherein if the preset bit is a first value, the first indication information indicates that there is a corresponding feedback message for the second message; If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message. The method according to claim 2, wherein the format of the BSR is a short BSR format or a truncated BSR format, the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR used to indicate the first indication information. The method according to claim 5, wherein if the logical channel group identifier is the identifier of the first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, wherein, The first logical channel group is a logical channel group that does not support the small data transmission SDT process of the terminal device in the inactive state; or, If the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group supports terminal equipment in Logical channel group of the SDT process in the inactive state. The method according to claim 2, wherein the format of the BSR is a long BSR format or a long truncated BSR format, and the BSR includes bits corresponding to each logical channel group identifier, and each logical channel The bits corresponding to each of the group identifiers are used to indicate the first indication information. The method according to claim 7, wherein if the bit corresponding to any one of the first logical channel groups is a third value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein , the first logical channel group is a logical channel group that does not support the SDT process of the terminal device in an inactive state; or, If the bits corresponding to each of the first logical channel groups have the fourth value, the first indication information indicates that there is no corresponding feedback message for the second message. The method according to claim 7, wherein if the bit corresponding to the preset logical channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the The preset logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or, If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message. The method according to claim 1, wherein the first message is a radio resource control (RRC) message, or the first message is uplink control information (UCI). The method according to claim 10, wherein, if the first indication information in the first message is the seventh value, the first indication information indicates that there is a corresponding feedback message in the second message; If the first indication information in the first message is the eighth value, the first indication information indicates that there is no corresponding feedback message in the second message. The method according to claim 10, wherein the first message includes a transmission identifier; If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message; If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, wherein the second preset message is that there is no corresponding feedback message information. The method according to any one of claims 10-12, wherein the RRC message is an RRC connection recovery request message. The method according to any one of claims 1-13, wherein the method further comprises: If the first indication information indicates that there is no corresponding feedback message for the second message, the terminal device enters an inactive state; If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device enters an inactive state after a first preset time period. The method according to any one of claims 1-13, wherein the method further comprises: After the network device receives the second message for a second preset time period, the terminal device enters an inactive state. The method according to any one of claims 1-15, wherein the first message is a message transmitted during the SDT process. The method according to any one of claims 1-16, wherein the second message is any one of the following: Long Term Evolution Technology Positioning Protocol (LPP) message, Location Service LCS message, RRC message. The method according to any one of claims 1-17, wherein the resources used for transmitting the first message are any of the following: preconfigured resources for small data transmission CG-SDT resources, Random access resources RA-SDT resources, dynamic scheduling resources, and random access resources for small data transmission. A communication method applied to network equipment, characterized in that it includes: receiving the first message sent by the terminal device, wherein the first message includes first indication information, the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second message is messages in the process. The method according to claim 19, wherein the first message is a BSR. The method according to claim 20, wherein the preset bit in the BSR is used to indicate the first indication information, and the preset bit is a bit in the reserved bits of the BSR , or, the preset bits are bits in the extended bits of the BSR. The method according to claim 21, wherein if the preset bit is a first value, the first indication information indicates that there is a corresponding feedback message for the second message; If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message. The method according to claim 20, wherein the format of the BSR is a short BSR format or a truncated BSR format, the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR used to indicate the first indication information. The method according to claim 23, wherein if the logical channel group identifier is the identifier of the first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, wherein, The first logical channel group is a logical channel group that does not support the SDT process of the terminal device in the inactive state; or, If the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group supports terminal equipment in Logical channel group of the SDT process in the inactive state. The method according to claim 20, wherein the format of the BSR is a long BSR format or a long truncated BSR format, and the BSR includes bits corresponding to each logical channel group identifier, and each logical channel The bits corresponding to each of the group identifiers are used to indicate the first indication information. The method according to claim 25, wherein if the bit corresponding to any one of the first logical channel groups is a third value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein , the first logical channel group is a logical channel group that does not support the SDT process of the terminal device in an inactive state; or, If the bits corresponding to each of the first logical channel groups have the fourth value, the first indication information indicates that there is no corresponding feedback message for the second message. The method according to claim 25, wherein if the bit corresponding to the preset logical channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the The preset logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or, If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message. The method according to claim 19, wherein the first message is an RRC message, or the first message is UCI. The method according to claim 28, wherein, if the first indication information in the first message is a fifth value, the first indication information indicates that there is a corresponding feedback message in the second message; If the first indication information in the first message is the sixth value, the first indication information indicates that there is no corresponding feedback message in the second message. The method according to claim 28, wherein the first message includes a transmission identifier; If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message; If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, wherein the second preset message is that there is no corresponding feedback message information. The method according to any one of claims 28-30, wherein the RRC message is an RRC connection recovery request message. The method according to any one of claims 19-31, further comprising: If the first indication information indicates that there is no corresponding feedback message for the second message, releasing the terminal device to an inactive state; If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device is released into an inactive state after a first preset time period. The method according to any one of claims 19-31, wherein the method further comprises: After the network device receives the second message for a second preset time period, the terminal device is released into an inactive state. The method according to any one of claims 19-33, wherein the first message is a message transmitted during the SDT process. The method according to any one of claims 19-34, wherein the second message is any one of the following: LPP message, LCS message, RRC message. The method according to any one of claims 19-35, wherein the resources used to transmit the first message are any of the following: CG-SDT resources, RA-SDT resources, dynamic scheduling resources, random Access resources. A communication device applied to terminal equipment, characterized in that it includes: A sending module, configured to send a first message to a network device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the second Messages are messages transmitted during the SDT. The device according to claim 37, wherein the first message is a buffer status report (BSR). The device according to claim 38, wherein the preset bit in the BSR is used to indicate the first indication information, and the preset bit is a bit in the reserved bits of the BSR , or, the preset bits are bits in the extended bits of the BSR. The device according to claim 39, wherein if the preset bit is the first value, the first indication information indicates that there is a corresponding feedback message for the second message; If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message. The device according to claim 38, wherein the format of the BSR is a short BSR format or a truncated BSR format, the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR used to indicate the first indication information. The device according to claim 41, wherein if the logical channel group identifier is the identifier of the first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, wherein, The first logical channel group is a logical channel group that does not support the small data transmission SDT process of the terminal device in the inactive state; or, If the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group supports terminal equipment in Logical channel group of the SDT process in the inactive state. The device according to claim 38, wherein the format of the BSR is a long BSR format or a long truncated BSR format, and the BSR includes bits corresponding to each logical channel group identifier, and each logical channel The bits corresponding to each of the group identifiers are used to indicate the first indication information. The device according to claim 43, wherein if the bit corresponding to any one of the first logical channel groups is a third value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein , the first logical channel group is a logical channel group that does not support the SDT process of the terminal device in an inactive state; or, If the bits corresponding to each of the first logical channel groups have the fourth value, the first indication information indicates that there is no corresponding feedback message for the second message. The device according to claim 43, wherein if the bit corresponding to the preset logical channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the The preset logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or, If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message. The device according to claim 37, wherein the first message is a radio resource control (RRC) message, or the first message is UCI. The device according to claim 46, wherein, if the first indication information in the first message is the seventh value, the first indication information indicates that there is a corresponding feedback message in the second message; If the first indication information in the first message is the eighth value, the first indication information indicates that there is no corresponding feedback message in the second message. The device according to claim 46, wherein the first message includes a transmission identifier; If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message; If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, wherein the second preset message is that there is no corresponding feedback message information. The device according to any one of claims 46-48, wherein the RRC message is an RRC connection recovery request message. The device according to any one of claims 37-49, wherein the device further comprises: Processing modules for: If the first indication information indicates that there is no corresponding feedback message for the second message, the terminal device enters an inactive state; If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device enters an inactive state after a first preset time period. The device according to any one of claims 37-49, wherein the processing module is further configured to: After the network device receives the second message for a second preset time period, the terminal device enters an inactive state. The device according to any one of claims 37-51, wherein the first message is a message transmitted during the SDT process. The device according to any one of claims 37-52, wherein the second message is any one of the following: a Long Term Evolution Positioning Protocol (LPP) message, a Location Service LCS message, and an RRC message. The device according to any one of claims 37-53, wherein the resources used for transmitting the first message are any of the following: pre-configured resources for small data transmission CG-SDT resources, Random access resources RA-SDT resources, dynamic scheduling resources, and random access resources for small data transmission. A communication device applied to network equipment, characterized in that it includes: A receiving module, configured to receive a first message sent by a terminal device, wherein the first message includes first indication information, and the first indication information is used to indicate whether there is a corresponding feedback message for the second message, and the first The second message is the message transmitted during the SDT. The apparatus according to claim 55, wherein the first message is a BSR. The device according to claim 56, wherein the preset bit in the BSR is used to indicate the first indication information, and the preset bit is a bit in the reserved bits of the BSR , or, the preset bits are bits in the extended bits of the BSR. The device according to claim 57, wherein if the preset bit is the first value, the first indication information indicates that there is a corresponding feedback message for the second message; If the preset bit is the second value, the first indication information indicates that there is no corresponding feedback message for the second message. The device according to claim 56, wherein the format of the BSR is a short BSR format or a truncated BSR format, the BSR includes a logical channel group identifier, and the logical channel group identifier in the BSR used to indicate the first indication information. The device according to claim 59, wherein if the logical channel group identifier is the identifier of the first logical channel group, the first indication information indicates that there is a corresponding feedback message for the second message, wherein, The first logical channel group is a logical channel group that does not support the SDT process of the terminal device in the inactive state; or, If the logical channel group identifier is the identifier of the second logical channel group, the first indication information indicates that there is no corresponding feedback message for the second message, where the second logical channel group supports terminal equipment in Logical channel group of the SDT process in the inactive state. The device according to claim 56, wherein the format of the BSR is a long BSR format or a long truncated BSR format, and the BSR includes bits corresponding to each logical channel group identifier, and each logical channel The bits corresponding to each of the group identifiers are used to indicate the first indication information. The device according to claim 61, wherein if the bit corresponding to any one of the first logical channel groups is a third value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein , the first logical channel group is a logical channel group that does not support the SDT process of the terminal device in an inactive state; or, If the bits corresponding to each of the first logical channel groups are all fourth values, the first indication information indicates that there is no corresponding feedback message for the second message. The device according to claim 61, wherein if the bit corresponding to the preset logical channel group is the fifth value, the first indication information indicates that there is a corresponding feedback message for the second message, wherein the The preset logical channel group is a logical channel group that does not support the SDT process of the terminal equipment in the inactive state; or, If the bit corresponding to the preset logical channel group is the sixth value, the first indication information indicates that there is no corresponding feedback message for the second message. The device according to claim 55, wherein the first message is an RRC message, or the first message is UCI. The device according to claim 64, wherein if the first indication information in the first message is a fifth value, the first indication information indicates that there is a corresponding feedback message in the second message; If the first indication information in the first message is the sixth value, the first indication information indicates that there is no corresponding feedback message in the second message. The device according to claim 64, wherein the first message includes a transmission identifier; If the transmission identifier is the transmission identifier of the first preset message, the first indication information indicates that there is a corresponding feedback message for the second message, where the first preset message is a message for which there is a corresponding feedback message; If the transmission identifier is the transmission identifier of the second preset information, the first indication information indicates that there is no corresponding feedback message for the second message, wherein the second preset message is that there is no corresponding feedback message information. The apparatus according to any one of claims 64-66, wherein the RRC message is an RRC connection recovery request message. The device according to any one of claims 55-67, wherein the device further comprises: Processing modules for: If the first indication information indicates that there is no corresponding feedback message for the second message, releasing the terminal device to an inactive state; If the first indication information indicates that there is a corresponding feedback message for the second message, the terminal device is released into an inactive state after a first preset time period. The device according to any one of claims 55-67, wherein the processing module is further used for: After the network device receives the second message for a second preset time period, the terminal device is released into an inactive state. The device according to any one of claims 55-69, wherein the first message is a message transmitted during the SDT process. The device according to any one of claims 55-70, wherein the second message is any one of the following: LPP message, LCS message, and RRC message. The device according to any one of claims 55-71, wherein the resources used to transmit the first message are any of the following: CG-SDT resources, RA-SDT resources, dynamic scheduling resources, random Access resources. A terminal device, characterized in that it includes: a transceiver, a processor, and a memory; the memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method according to any one of claims 1 to 18. A network device, characterized by comprising: a transceiver, a processor, and a memory; the memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor executes the communication method according to any one of claims 19 to 36. A computer-readable storage medium, characterized in that, computer-executable instructions are stored in the computer-readable storage medium, and when the computer-readable instructions are executed by a processor, they are used to implement claims 1 to 18 or 19 to 36 The communication method described in any one. A computer program product, comprising a computer program, characterized in that, when the computer program is executed by a processor, the communication method according to any one of claims 1 to 18 or 19 to 36 is implemented.