CN116634488A

CN116634488A - Communication method and device

Info

Publication number: CN116634488A
Application number: CN202210130567.5A
Authority: CN
Inventors: 毛颖超; 常俊仁; 酉春华; 唐骥
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2023-08-22
Also published as: WO2023151482A1

Abstract

The embodiment of the application provides a communication method and a device, wherein the method comprises the following steps: the terminal equipment sends a first message and starts a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first message transmission is unsuccessful, the terminal device stops the first timer, so that the situation that another random access process is introduced when the SDT process is in progress can be reduced, the access abnormality of the terminal device is reduced, the network device recognizes and processes the access abnormality of the terminal device, and the access success rate of the SDT is further improved.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

The terminal device in the inactive state supports small data transmissions (small data transmission, SDT), in particular Random Access (RA) based small data transmissions, i.e. RA-SDT and Configured Grant (CG) based SDT transmissions of type1 (type 1) resources, i.e. CG-SDT.

In the RA-SDT procedure or CG-SDT procedure, the terminal device sends a second message or a first message to the network device, where the first message may also be referred to as an initial uplink message, and starts a contention resolution Timer or a physical downlink control channel (physical downlink control channel, PDCCH) listening Timer, when the second message or the first message includes buffer status report (buffer status report, BSR) information, for example, BSR medium access layer (media access control, MAC) Control Element (CE), the terminal device starts a retransmission buffer status report Timer (retxBSR-Timer), optionally, the duration of retxBSR-Timer is longer than the duration of the contention resolution Timer or PDCCH listening Timer, and when the contention resolution Timer fails, or when the PDCCH listening Timer does not receive a response message from the network device, that is, the initial uplink message is failed to be transmitted, the retxBSR continues to run until time out, after the time out, since the logical channel contains data to be transmitted, the regular BSR is triggered, and the terminal device does not have a random resource to trigger (e.g. the BSR is not used for the BSR) since the BSR is configured in the network device, but the random SR is not triggered by the network device (35, the SR is configured to trigger the network device). However, the terminal device re-performs the RA-SDT random access procedure or the CG-SDT initial uplink message transmission (i.e., re-transmission) when the contention resolution fails, and the terminal device and the network device do not establish a connection at this time, and in the RA-SDT process, PUCCH resources not used for SR are introduced to trigger the random access procedure, or the terminal device selects PUCCH resources not used for SR to trigger the random access procedure, which may cause network abnormality due to the RA-SDT process or the CG-SDT process, i.e., the terminal device and the network device do not establish a connection, thereby failing RA-SDT or CG-SDT.

Disclosure of Invention

The embodiment of the application discloses a communication method and a communication device for improving the access success rate of SDT.

The first aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the terminal equipment sends a first message and starts a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); and if the first message transmission is unsuccessful, stopping the first timer by the terminal equipment.

In the method, by means of the first timer being not successfully stopped in the first message transmission, the triggering of the regular BSR due to the overtime of the first timer can be reduced, and further the triggering of the scheduling request SR due to the lack of authorization is reduced, so that the occurrence of the triggering of random access due to the lack of SR resources is reduced, and therefore, the terminal equipment can continue to perform the current SDT process, the access abnormality of the terminal equipment is reduced, the identification and the processing of the access abnormality of the terminal equipment by the network equipment are reduced, and the access success rate of the SDT is further improved.

In one possible implementation, the first Timer includes a retransmission buffer status report Timer retxbr-Timer.

In one possible implementation, the first message transmission is unsuccessful, including: the second message is not received before the second timer times out; or, receiving a second message before a second timer expires, but the first identity in the second message does not match the second identity in the first message; or, receiving a second message before the second timer expires, the second message indicating a negative acknowledgement, NACK; wherein the second message is a response message to the first message.

In yet another possible implementation, the first message transmission is unsuccessful, including: the second timer times out; or if a second timer runs, the terminal equipment receives a second message, wherein a first identifier in the second message is not matched with a second identifier in the first message; or if the second timer runs, the terminal device receives a second message, wherein the second message indicates negative acknowledgement NACK.

In yet another possible implementation, the second message is a response message to the first message. For example, in the RA-SDT procedure, the second message is a contention resolution message; in CG-SDT procedures, the second message is a response message or an acknowledgement message.

In yet another possible implementation, the second timer timeout includes: the second timer expires and the terminal device does not receive the second message.

In yet another possible implementation, the second message includes at least one of: the contention resolution message is a Physical Downlink Control Channel (PDCCH) transmission message scrambled by a cell radio network temporary identity (C-RNTI), a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identity (CS-RNTI), or a Radio Resource Control (RRC) message.

In yet another possible implementation, the first Timer includes a retransmission buffer status report Timer retxbr-Timer and the second Timer includes a contention resolution Timer or a PDCCH listening Timer.

In yet another possible implementation, the first message satisfies at least one of: the first message is carried in a Common Control Channel (CCCH) message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process of small data transmission; or the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message.

In yet another possible implementation, the first message includes a buffer status report BSR medium access control MAC control element CE, including: the BSR corresponding to the BSR MAC CE is triggered and not cancelled; the first message includes the BSR MAC CE if uplink shared channel resources for a new transmission are available and the size of the uplink shared channel resources may include the BSR MAC CE plus the size of its sub-header.

In yet another possible implementation, the terminal device is in an RRC inactive state or an RRC idle state.

In a further possible implementation, the terminal device is in a small data transmission procedure or a data early transmission procedure.

The second aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the method comprises the steps that a terminal device sends a first message, and a first timer is started, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer times out, the logical channel of the terminal device includes uplink data, and a first condition is satisfied, the terminal device triggers a first BSR, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

In the method, by means of triggering the first BSR when the first timer is overtime and the logic channel contains uplink data and meets the first condition, the occurrence of triggering the first BSR when the terminal equipment and the network equipment are not connected can be reduced, further, the condition that a Scheduling Request (SR) is triggered due to no authorization and random access is triggered due to no SR resource is reduced, so that the terminal equipment continues to perform the current SDT process, the access abnormality of the terminal equipment is reduced, the network equipment identifies and processes the access abnormality of the terminal equipment, and the access success rate of the SDT is further improved.

In one possible implementation, the first message transmission success includes at least one of: the terminal equipment receives the contention resolution message, the terminal equipment receives the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI, the terminal equipment receives the PDCCH transmission message scrambled by the configuration scheduling radio network temporary identifier CS-RNTI, the terminal equipment receives the radio resource control RRC message, the terminal equipment receives the automatic retransmission request acknowledgement ARQ ACK message or the terminal equipment receives the hybrid automatic retransmission request acknowledgement HARQ ACK message.

In yet another possible implementation, the method further includes: if the first timer times out, the logical channel of the terminal device includes uplink data, and the first condition is not satisfied, and the terminal device does not trigger the first BSR.

In yet another possible implementation, the logical channel corresponds to an SDT radio bearer RB.

In yet another possible implementation, the first Timer includes a retransmission buffer status report Timer retxbr-Timer.

In yet another possible implementation, the first BSR includes a regular BSR.

The third aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the method comprises the steps that a terminal device sends a first message, and a first timer is started, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer times out, the logical channel of the terminal device includes uplink data, and a first condition is not satisfied, the terminal device does not trigger the first BSR, and the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

In the method, by means that the first BSR is not triggered when the first timer is overtime and the logic channel contains uplink data and does not meet the first condition, triggering of the first BSR under the condition that the connection between the terminal equipment and the network equipment is not established can be reduced, further triggering of the scheduling request SR due to no authorization is reduced, and triggering of random access due to no SR resource is performed, so that the terminal equipment continues to perform the current SDT process, thereby reducing access abnormality of the terminal equipment, identifying and processing of the access abnormality of the terminal equipment by the network equipment, and further improving the access success rate of the SDT.

The fourth aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the method comprises the steps that a terminal device sends a first message, and a first timer is started, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer is overtime and the logic channel of the terminal equipment contains uplink data, the terminal equipment triggers a regular Buffer Status Report (BSR); if the regular BSR is triggered, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT, the terminal device triggers a scheduling request SR.

In the method, by triggering the regular BSR without available uplink transmission resources and triggering the scheduling request SR by the terminal equipment under the condition that the regular BSR is not triggered in an inactive state or is not triggered in a small data transmission SDT process, triggering of the first BSR under the condition that connection is not established between the terminal equipment and the network equipment can be reduced, and further triggering of the scheduling request SR due to the fact that no authorized resources exist is reduced, so that the condition that random access is triggered due to the fact that no SR resources exist is reduced, and therefore the terminal equipment continues to perform the SDT process, access abnormality of the terminal equipment is reduced, and recognition and processing of the access abnormality of the terminal equipment by the network equipment are further improved.

In one possible implementation, the method further includes: and if the terminal equipment triggers the SR and the Physical Uplink Control Channel (PUCCH) resource for the SR does not exist, the terminal equipment triggers random access.

In yet another possible implementation manner, the regular BSR is not triggered in an inactive state or is not triggered in a small data transfer procedure SDT, including: the regular BSR is not triggered at an initial stage in the SDT procedure, or the regular BSR is triggered after contention resolution is successful in the SDT procedure, or the regular BSR is triggered when contention resolution is successfully completed in the SDT procedure, or the regular BSR is triggered after random access-based SDT is successfully completed, or the regular BSR is triggered after the first message transmission is successfully completed, or the first message transmission is successfully completed when the regular BSR is triggered, or the regular BSR is triggered in case that the terminal device and the network device establish a connection, or the regular BSR is triggered after the terminal device receives an acknowledgement message for the first message from the network device; the regular BSR is triggered when the terminal device receives a response message from the network device for the first message, or the regular BSR is triggered after the terminal device receives a physical downlink control channel PDCCH transmission message scrambled by a cell radio network temporary identity C-RNTI, or the regular BSR is triggered after the terminal device receives a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identity CS-RNTI, or the regular BSR is triggered after the terminal device receives a radio resource control RRC message.

In yet another possible implementation, if the regular BSR is triggered, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or triggered during a small data transmission SDT; the triggering of the scheduling request SR by the terminal device includes: if the regular BSR is triggered and the timer of the delay SR is not running, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered in an SDT procedure, the terminal device triggers the SR.

In another possible implementation manner, the resources of the uplink transmission that are not available include: there are no available uplink newly transmitted resources.

In yet another possible implementation, the method further includes: if the regular BSR is triggered and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is triggered in an inactive state or triggered in an SDT procedure; the terminal device does not trigger an SR.

In yet another possible implementation, the regular BSR is triggered in an inactive state or triggered in an SDT procedure, including: the regular BSR is triggered at an initial stage in the SDT procedure, or the regular BSR is not triggered after contention resolution is successful in the SDT procedure, or the regular BSR is not triggered when contention resolution is successfully completed in the SDT procedure, or the regular BSR is not triggered after random access-based SDT is successfully completed, or the regular BSR is not triggered after successful completion of the first message transmission, or the first message transmission is not successfully completed when the regular BSR is triggered, or the regular BSR is not triggered in case the terminal device and the network device establish a connection, or the regular BSR is not triggered after the terminal device receives an acknowledgement message for the first message from the network device; the regular BSR is not triggered by the terminal device upon receiving a response message from the network device for the first message, or the regular BSR is not triggered after the terminal device receives a PDCCH transmission message scrambled by a C-RNTI, or the regular BSR is not triggered after the terminal device receives a PDCCH transmission message scrambled by a CS-RNTI, or the regular BSR is not triggered after the terminal device receives an RRC message.

The fifth aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the method comprises the steps that a terminal device sends a first message, and a first timer is started, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer is overtime and the logic channel of the terminal equipment contains uplink data, the terminal equipment triggers a regular Buffer Status Report (BSR); if the regular BSR is triggered, there is no available uplink resource, and the regular BSR is triggered in an inactive state or triggered during a small data SDT procedure, the terminal device does not trigger a scheduling request SR.

In the method, by triggering the regular BSR without available uplink resources and in the case that the regular BSR is triggered in an inactive state or triggered in an SDT process, the terminal device does not trigger the scheduling request SR, which can reduce triggering of the first BSR when the terminal device and the network device are not connected, thereby reducing triggering of the scheduling request SR due to lack of authorized resources, and reducing triggering of random access due to lack of SR resources.

The sixth aspect of the embodiment of the application discloses a communication method, which comprises the following steps: if a regular buffer status report, regular BSR, is triggered, there are no available uplink transmission resources and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission, SDT, the terminal device triggers a scheduling request, SR.

In one possible implementation, the method further includes: the terminal equipment sends a first message, and starts a first timer, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer is overtime and the logic channel of the terminal equipment contains uplink data, the terminal equipment triggers a regular Buffer Status Report (BSR); or if there is new uplink data on the first logical channel, the priority of the first logical channel is higher than the priority of any one logical channel containing available uplink data in any one logical channel group, and the terminal device triggers a regular buffer status report (regular BSR), wherein the first logical channel is any one of the logical channels of the terminal device or any one of the logical channels associated with the SDT.

In one possible implementation, the logical channel is a channel associated with an SDT.

In the method, the triggering of the first BSR under the condition that the connection between the terminal equipment and the network equipment is not established can be reduced, and further, the triggering of the scheduling request SR due to the lack of authorized resources is reduced, and the triggering of the random access due to the lack of SR resources is reduced.

The seventh aspect of the embodiment of the application discloses a communication method, which comprises the following steps: if the scheduling request SR is triggered, the logic channel of the terminal equipment has uplink data, no resource is used for the SR, and the second condition is met, and the terminal equipment triggers a random access process; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

In the method, if the SR is triggered, the logic channel of the terminal device has uplink data, no available uplink transmission resource exists, the second condition is met, and the method of triggering the random access procedure can reduce triggering of the first BSR under the condition that the terminal device and the network device are not connected, thereby reducing triggering of the scheduling request SR due to the lack of authorized resources, and further reducing triggering of the random access due to the lack of SR resources.

In one possible implementation, the method further includes: the terminal equipment sends a first message, and starts a first timer, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer is overtime and the logic channel of the terminal equipment contains uplink data, the terminal equipment triggers a regular Buffer Status Report (BSR); if the regular BSR is triggered, there is no available uplink transmission resource, and the terminal device triggers a scheduling request SR.

An eighth aspect of the embodiment of the present application discloses a communication method, including: if the scheduling request SR is triggered, the logic channel of the terminal equipment has uplink data, does not have resources for SR and does not meet the second condition, and the terminal equipment does not trigger a random access process; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

In the above method, if the SR is triggered, the logical channel of the terminal device has uplink data, no available uplink transmission resource does not meet the second condition, and the manner of not triggering the random access procedure is not satisfied, so that the triggering of the first BSR under the condition that the terminal device and the network device are not connected can be reduced, and further, the triggering of the scheduling request SR due to the lack of authorized resources is reduced, thereby reducing the triggering of the random access due to the lack of SR resources, and in this way, the terminal device can continue the current SDT procedure, thereby reducing the access abnormality of the terminal device, and the recognition and processing of the access abnormality of the network device to the terminal device, and further, the access success rate of the SDT is improved.

In one possible implementation, the method further includes: the terminal equipment sends a first message, and starts a first timer, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first timer is overtime and the logic channel of the terminal equipment contains uplink data, the terminal equipment triggers a regular Buffer Status Report (BSR); if the regular BSR is triggered, there is no available uplink transmission resource, and the terminal device triggers an SR.

The ninth aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the method comprises the steps that a terminal device sends a first message, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first message meets at least one of the following items, the terminal equipment starts a first timer; the at least one item includes: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent by the terminal equipment to the network equipment in the SDT process of small data transmission; the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed.

In the above method, the means for starting the first timer by the first message satisfies at least one of: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent by the terminal equipment to the network equipment in the SDT process of small data transmission; the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed; the method and the device can reduce triggering of the first BSR under the condition that connection is not established between the terminal equipment and the network equipment, further reduce triggering of the scheduling request SR due to the fact that no authorized resource exists, and further reduce triggering of random access due to the fact that no SR resource exists.

In one possible implementation, the first message transmission is successfully completed, including at least one of: the terminal equipment receives the contention resolution message, the terminal equipment receives the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI, the terminal equipment receives the PDCCH transmission message scrambled by the configuration scheduling radio network temporary identifier CS-RNTI, or the terminal equipment receives the radio resource control RRC message.

In yet another possible implementation, the terminal device does not start a first timer if the first message meets at least one of; the at least one item includes: the first message is carried in a CCCH message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is not completed successfully.

In one possible implementation, the first message is not successfully completed, including at least one of the following: the terminal equipment does not receive the contention resolution message, the terminal equipment does not receive the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI, the terminal equipment does not receive the PDCCH transmission message scrambled by the configuration scheduling radio network temporary identifier CS-RNTI, or the terminal equipment does not receive the radio resource control RRC message.

In one possible implementation, the first message includes a buffer status report BSR medium access control MAC control element CE, including: the BSR corresponding to the BSR MAC CE is triggered and not cancelled; the first message includes the BSR MAC CE if uplink shared channel resources for a new transmission are available and the size of the uplink shared channel resources may include the BSR MAC CE plus the size of its sub-header.

The tenth aspect of the embodiment of the application discloses a communication method, which comprises the following steps: the terminal equipment sends a first message and starts a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); if the first message transmission is unsuccessful, the first timer times out, and the terminal equipment does not trigger or ignore or discard the first random access.

In the method, through the way that the first message transmission is unsuccessful and the first timer is overtime, the terminal equipment does not trigger or neglect or abandon the first random access, the triggering of the regular BSR due to the overtime of the first timer can be reduced, and further, the triggering of the scheduling request SR due to the fact that no authorized resource exists is reduced, so that the condition that the random access is triggered due to the fact that no SR resource exists is reduced, the terminal equipment can continue to carry out the current SDT process, the access abnormality of the terminal equipment is reduced, the identification and the processing of the access abnormality of the terminal equipment by the network equipment are reduced, and the access success rate of the SDT is further improved.

In yet another possible implementation, the first message transmission is unsuccessful, including: the second timer times out; or if a second timer runs, the terminal equipment receives a second message, wherein a first identifier in the second message is not matched with a second identifier in the first message; or if a second timer runs, the terminal equipment receives a second message, wherein the second message indicates negative acknowledgement NACK;

in yet another possible implementation, the second message is a response message to the first message. The second message may be a contention resolution message, for example in the RA-SDT procedure; in CG-SDT procedures, the second message may be a response message or an acknowledgement message.

In yet another possible implementation manner, the terminal device does not trigger or ignore or discard the first random access, including: and if the terminal equipment does not have the Physical Uplink Control Channel (PUCCH) resource for Scheduling Request (SR), the terminal equipment does not trigger or ignore or discard the first random access.

In yet another possible implementation, the first message is sent during a small data transfer SDT based on a second random access; wherein the priority of the first random access is lowest; or the priority of the first random access is lower than the priority of the second random access.

In yet another possible implementation, the first Timer includes a retransmission buffer status report Timer retxbr-Timer; the second timer comprises a contention resolution timer or a Physical Downlink Control Channel (PDCCH) listening timer.

An eleventh aspect of the embodiment of the present application discloses a communication method, including: and the terminal equipment sends a third message, wherein the third message is a retransmission message of the first message, and the redundancy version RV used by the third message is the same as the RV version of the first message.

In the method, the success rate of autonomous retransmission is improved by fixing the RV number of the redundancy version of autonomous retransmission, and the access success rate of SDT is further improved.

In one possible implementation, the first message satisfies at least one of: the first message is carried in a Common Control Channel (CCCH) message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process of small data transmission; or the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message.

In yet another possible implementation, the first message is transmitted on a configured grant resource.

In yet another possible implementation, the third message is transmitted on a configured grant resource.

In yet another possible implementation manner, the redundancy version RV number of the third message is a positive integer.

A twelfth aspect of the embodiments of the present application discloses a communication device, which may be a terminal device or a chip in a terminal device according to any of the first to eleventh aspects above, the terminal device comprising corresponding means (means) or modules for performing the above method. For example, the communication device: comprising a processing unit (sometimes also called processing module) and a communication unit (sometimes also called communication module), wherein: the processing unit is used for sending a first message through the communication unit and starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit is configured to stop the first timer when the first message transmission is unsuccessful.

Wherein: the processing unit is used for sending a first message through the communication unit and starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit is configured to trigger a first BSR when the first timer expires, where a logical channel of the apparatus includes uplink data, and a first condition is satisfied, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out; or alternatively, the process may be performed,

wherein: the processing unit is configured to send a first message through the communication unit, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit is configured to, when the first timer expires, not trigger the first BSR if a logical channel of the apparatus includes uplink data and a first condition is not satisfied, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

Wherein: the processing unit is used for sending a first message through the communication unit and starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit is configured to trigger a regular buffer status report (regular BSR) when the first timer expires and a logical channel of the apparatus includes uplink data; the processing unit is configured to, when the regular BSR is triggered, have no available uplink transmission resources, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT; triggering a scheduling request SR.

Wherein: the processing unit is used for sending a first message through the communication unit and starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit is configured to trigger a regular buffer status report (regular BSR) when the first timer expires and a logical channel of the apparatus includes uplink data; the processing unit is configured to not trigger a scheduling request SR when the regular BSR is triggered, there is no available uplink resource, and the regular BSR is triggered in an inactive state or triggered during a small data transmission SDT.

Wherein: the processing unit is configured to trigger a scheduling request SR when a regular Buffer Status Report (BSR) is triggered, there is no available uplink resource, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT.

Wherein: the processing unit is configured to trigger a random access procedure when the scheduling request SR is triggered, a logical channel of the device has uplink data, no resource is used for the SR, and a second condition is satisfied; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

Wherein: the processing unit is configured to, when the scheduling request SR is triggered, not trigger a random access procedure if a logical channel of the device has uplink data, no resource for SR, and does not satisfy a second condition; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

Wherein: the communication unit is configured to send a first message, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit is used for starting a first timer in the case that the first message meets at least one of the following items; the at least one item includes: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent to the network device in the process of Small Data Transfer (SDT); the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed.

Wherein: the processing unit is used for sending a first message through the communication unit and starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit is configured to not trigger or ignore or discard a first random access if the first message transmission is unsuccessful and the first timer expires; alternatively, wherein: the processing unit is configured to send a third message through the communication unit, where the third message is a retransmission message of the first message, and a redundancy version RV used by the third message is the same as an RV version of the first message.

For another example, the communication device includes: a processor, coupled to the memory, for executing instructions in the memory to implement a method performed by the terminal device in any of the first to seventh aspects. Optionally, the communication device further comprises other components, such as an antenna, an input-output module, an interface, etc. These components may be hardware, software, or a combination of software and hardware.

A thirteenth aspect of the embodiments of the present application discloses a communication device, the device including a memory for storing instructions and a processor for calling and executing the instructions from the memory, so that the communication device performs any one of the above or a possible implementation manner of any one of the above.

A fourteenth aspect of the embodiments of the present application discloses a chip system, which includes at least one processor and a communication interface, where the at least one processor is configured to execute a computer program or instructions to implement the method according to any one of the above aspects.

A fifteenth aspect of the embodiments of the present application discloses a computer readable storage medium having stored therein computer instructions which, when run on a processor, implement the method of any of the above aspects.

A sixteenth aspect of an embodiment of the application discloses a computer program product comprising computer program code for implementing the method according to any of the preceding aspects, when said computer program code is run on a computer.

Drawings

The drawings used in the embodiments of the present application are described below.

Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an RA-SDT procedure provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a CG-SDT process provided by an embodiment of the application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

FIG. 5 is a flow chart of yet another communication method according to an embodiment of the present application;

FIG. 6 is a flow chart of yet another communication method according to an embodiment of the present application;

FIG. 7 is a flow chart of yet another communication method according to an embodiment of the present application;

FIG. 8 is a flow chart of yet another communication method according to an embodiment of the present application;

FIG. 9 is a flow chart of yet another communication method according to an embodiment of the present application;

FIG. 10 is a flow chart of yet another communication method according to an embodiment of the present application;

Fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

The technical scheme provided by the application can be applied to various communication systems, and can also be applied to future communication systems, such as a sixth generation mobile communication system and the like. The application is not limited in this regard. For example: long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) telecommunications system, fifth generation (5th Generation,5G) mobile telecommunications system, or new radio access technology (new radio access technology, NR). The 5G mobile communication system may include a non-independent Networking (NSA) and/or an independent networking (SA), among others.

The technical scheme provided by the application can be also applied to machine type communication (machine type communication, MTC), inter-machine communication long term evolution (long term evolution-machine, LTE-M), device-to-device (D2D) network, machine-to-machine (machine to machine, M2M) network, internet of things (internet of things, ioT) network or other networks. The IoT network may include, for example, an internet of vehicles. The communication modes in the internet of vehicles system are generally called as vehicle to other devices (V2X, X may represent anything), for example, the V2X may include: vehicle-to-vehicle (vehicle to vehicle, V2V) communication, vehicle-to-infrastructure (vehicle to infrastructure, V2I) communication, vehicle-to-pedestrian communication (vehicle to pedestrian, V2P) or vehicle-to-network (vehicle to network, V2N) communication, etc.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a communication system 100 according to an embodiment of the present application, where the communication system 100 includes a network device 111 and a terminal device 101, a terminal device 102, a terminal device 103, a terminal device 104, a terminal device 105, and a terminal device 106. It should be understood that communication system 100 may include more network devices or more or fewer terminal devices. The network device and the terminal device may be hardware, or may be functionally divided software, or a combination of both. Communication between the network device and the terminal device may be through other devices or network elements. In this system, the network device 111 may perform data transmission with a plurality of terminal devices, that is, the network device 111 transmits downlink data to the terminal device 101-terminal device 106, and of course, the terminal device 101-terminal device 106 may also transmit uplink data to the network device 111. In addition, the terminal device 104, the terminal device 105, and the terminal device 106 may also constitute a communication system in which the network device 111 may transmit downlink data to the terminal device 101, the terminal device 102, and the terminal device 105, and then the terminal device 105 transmits the downlink data to the terminal device 104 or the terminal device 106. The method in the embodiment of the present application may be applied to the communication system 100 shown in fig. 1.

1) Terminal devices, including User Equipment (UE), include devices that provide voice and/or data connectivity to a user, and in particular, include devices that provide voice to a user, or include devices that provide data connectivity to a user, or include devices that provide voice and data connectivity to a user. For example, may include a handheld device having wireless connectivity, or a processing device connected to a wireless modem. The terminal device may communicate with the core network via a radio access network (radio access network, RAN), exchange voice or data with the RAN, or interact voice and data with the RAN. The terminal devices may include UEs, wireless terminal devices, mobile terminal devices, device-to-device (D2D) terminal devices, vehicle-to-everything (vehicle to everything, V2X) terminal devices, machine-to-machine/machine-type communications, M2M/MTC) terminal devices, internet of things (internet of things, ioT) terminal devices, lightweight terminal devices (light UEs), reduced capability user devices (reduced capability UEs, remote UEs), subscriber units (subscriber stations (subscriber station), mobile stations (mobile stations), remote stations (access points (APs), remote terminals (access terminals), user terminals (user agents), or user equipment (user devices), and the like. For example, mobile telephones (or "cellular" telephones) computers with mobile terminal devices, portable, pocket, hand-held, computer-built mobile devices, and the like may be included. Such as personal communication services (personal communication service, PCS) phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDAs), and the like. But also limited devices such as devices with lower power consumption, or devices with limited memory capabilities, or devices with limited computing capabilities, etc. Examples include bar codes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning systems (global positioning system, GPS), laser scanners, and other information sensing devices. While the various terminal devices described above, if located on a vehicle (e.g., placed in a vehicle or mounted in a vehicle), may be considered as in-vehicle terminal devices, for example, also referred to as in-vehicle units (OBUs). In the embodiment of the application, the terminal equipment can also comprise a relay. Or it is understood that all that is capable of data communication with a base station can be seen as a terminal device.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device or an intelligent wearable device, and is a generic name for intelligently designing daily wear and developing wearable devices, such as glasses, gloves, watches, clothes, shoes, and the like, by applying wearable technology. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

In the embodiment of the present application, the device for implementing the function of the terminal device may be the terminal device, or may be a device capable of supporting the terminal device to implement the function, for example, a chip system, and the device may be installed in the terminal device. In the embodiment of the application, the chip system can be composed of chips, and can also comprise chips and other discrete devices. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the terminal is a terminal device, which is described in the technical solution provided in the embodiment of the present application.

2) A network device, for example comprising AN Access Network (AN) device, such as a base station (e.g. AN access point), may refer to a device in the access network that communicates over the air with a wireless terminal device through one or more cells, or a network device in a vehicle-to-infrastructure (V2X) technology, for example, is a Road Side Unit (RSU). The base station may be configured to inter-convert the received air frames with IP packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting V2X applications, which may exchange messages with other entities supporting V2X applications. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in an LTE system or advanced long term evolution (long term evolution-advanced, LTE-a), or may also include a next generation node B (next generation node B, gNB) in a fifth generation mobile communication technology (the 5th generation,5G) NR system (also simply referred to as an NR system) or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud access network (Cloud radio access network, cloud RAN) system, and embodiments of the present application are not limited.

The network devices may also include core network devices including, for example, access and mobility management functions (access and mobility management function, AMF), user plane functions (user plane function, UPF), or session management functions (session management function, SMF), etc.

In the embodiment of the present application, the means for implementing the function of the network device may be the network device, or may be a means capable of supporting the network device to implement the function, for example, a chip system, and the apparatus may be installed in the network device. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the network device is exemplified by the network device, and the technical solution provided in the embodiment of the present application is described.

In the description of the present application, terms such as "first," "second," "S401," or "S402" are used merely for convenience of description and context, and different order numbers do not themselves have a specific technical meaning, and are not to be construed as indicating or implying relative importance, nor as indicating or implying an order of execution of operations, which should be determined by their functions and inherent logic.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, "a and/or B" may indicate: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.

In the present application, "transmission" may include the following three cases: data transmission, data reception, or both data transmission and data reception. In the present application, "data" may include traffic data, and/or signaling data.

The terms "comprises" or "comprising" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process/method comprising a series of steps, or a system/article/apparatus that comprises a list of elements is not necessarily limited to those steps or elements expressly listed or inherent to such process/method/article/apparatus, but may include other steps or elements not expressly listed or inherent to such process/method/article/apparatus.

In the description of the present application, with respect to the number of nouns, unless otherwise indicated, reference is made to "a singular noun or plural noun", i.e. "one or more". "at least one" means one or more. "includes at least one of: a, B and C. "means may include A, or B, or C, or A and B, or A and C, or B and C, or A, B and C. Wherein A, B and C can be single or multiple.

First, some terms in the present application will be explained in order to be understood by those skilled in the art.

Terminal devices in an INACTIVE (rrc_inactive) state support SDT, in particular RA-based small data transmission, i.e. RA-SDT, and SDT transmission based on Configured Grant (CG) type1 (type 1) resources, i.e. CG-SDT.

(1) The RA-SDT procedure, as shown in FIG. 2, is specifically as follows:

step 0: the network device sends a radio resource control release (radio resource control release, RRCRelease) message to a terminal device in rrc_inactive state or in CONNECTED (rrc_connected) state, and the terminal device receives the RRCRelease message from the network device, accordingly. The message includes information such as Radio Bearers (RB) configuration for small data transmissions in the inactive state, e.g., the radio bearers for small data transmissions include data radio bearers (data radio bearers, DRB) and signaling radio bearers (signaling radio bearers, SRB). Optionally, the message may further include configuration information for configuration authorization for small data transmission in rrc_inactive state. The message may also include a data amount threshold for small data transmissions, and/or a reference signal received power RSRP threshold. Correspondingly, after receiving the RRCRelease message, the terminal device enters an rrc_inactive state. When the terminal device in the rrc_inactive state satisfies the small data transmission condition and selects small data transmission based on random access based on the SDT selection criteria, the terminal device initiates an RA-SDT procedure. Wherein, the small data transmission conditions include: 1) The amount of data is less than a first threshold configured by the network device in the system information or in the RRCRelease message; 2) The reference signal received power (reference signal receiving power, RSRP) is greater than a second threshold configured by the network device in the system information or in the RRCRelease message; 3) All data to be sent is mapped onto the radio bearer for the SDT. Furthermore, for small data transmission conditions based on random access, random access resources for SDT are also included.

Step 1: the terminal device sends a random access preamble (preamble) to the network device, and the network device receives the preamble from the network device. Specifically, the terminal device transmits a random access preamble (preamble) on a physical random access channel (physical random access channel, PRACH), which message may be referred to as message 1 (msg 1). The primary function of the preamble is that the terminal device tells the network device that there is a random access request, and enables the network device to estimate the transmission delay between the network device and the terminal device, where the delay estimated value is included in the random access response and is used to adjust the uplink transmission time of the terminal device. In general, the network device informs the terminal device of the time-frequency resource set of PRACH available for the small data transmission preamble in the current cell through the system message, the terminal device selects PRACH resources in the time-frequency resource set, and then sends a preamble on the selected PRACH resources, i.e. initiates random access.

Step 2: the terminal device receives a random access response (random access response, RAR) message from the network device, which may be referred to as message 2 (msg 2). After the terminal equipment sends the random access preamble, a random access response window is started to receive the random access response RAR message of the network equipment. The RAR message includes preamble identification information, timing Advance (TA) information, and uplink grant (UL grant) information. Optionally, temporary cell radio network temporary identifier (temporary cell radio network tempory identity, TC-RNTI) information of the terminal device may also be included in the RAR message. Correspondingly, after receiving the RAR message from the network device, the terminal device determines whether the preamble identification information in the RAR message is the same as the random access preamble sent by the terminal device in the step 1, and if so, the RAR message is considered to be successfully received.

Step 3: the terminal device sends an initial uplink message to the network device, and the network device receives the initial uplink message from the terminal device. It should be appreciated that the initial uplink message is the first uplink message in the RA-SDT procedure except for the random access preamble. Specifically, the terminal device sends an initial uplink message, which may also be referred to as a first uplink message, to the network device through a physical uplink shared channel (physical uplink shared channel, PUSCH) on a corresponding uplink resource according to the uplink grant information in the RAR message, where the message may be referred to as message 3 (msg 3). The first uplink message includes a radio resource control (radio resource control, RRC) message, for example, an RRC resume request (rrcresmerequest) message. The message includes identification information of the terminal equipment, such as a cell radio network temporary identifier (cell-radio network temporary identifier, C-RNTI) or a small data transmission radio network temporary identifier (small data transmission-radio network temporary identifier, SDT-RNTI) or a TC-RNTI or an inactive radio network temporary identifier (I-radio network temporary identifier, I-RNTI) or a fifth generation system temporary mobile subscriber identity (5G system-temporary mobile subscriber identity, 5G-S-TMSI) or a random value. Optionally, the initial uplink message may further include one or more of the following according to the logical channel priority: data on a radio bearer configured for small data transmission, BSR MAC CE, power headroom report (power headroom report, PHR) MAC CE, small data transmission auxiliary information (SDT assistance information, SAI) MAC CE, padding bits.

After the terminal device sends the message 3, starting a contention resolution timer, and the terminal device monitors the PDCCH to acquire a contention resolution response message of the network device. The contention resolution timer may have a duration of 8 milliseconds (ms), 16ms,24ms,32ms,40ms,48ms,56ms,64ms. Optionally, the terminal device sends an initial uplink message, and the terminal device recovers the configured RB for SDT, including DRB and/or SRB. The packet data convergence protocol (packet data convergence protocol, PDCP) configuration can also be restored, as well as the mapping of quality of service (quality of service, qoS) flows to DRBs; logical channel configuration may also be restored; RRC configuration, radio link control (radio link control, RLC) configuration, etc. may also be restored. Optionally, if the initial uplink message includes a BSR MAC CE, the terminal device starts a retransmission buffer status report Timer (retbsr-Timer) after sending the initial uplink message to the network device, for example, the duration of the retbsr-Timer is 80ms.

Step 4: the network device sends a contention resolution message to the terminal device, and the terminal device receives the contention resolution message from the network device, which may be referred to as message 4 (msg 4).

Because the message 3 carries the identification information of the terminal equipment, the network equipment can carry the identification information of the terminal equipment through msg4 in the contention resolution mechanism to designate the terminal equipment which wins the contention resolution, and specifically, if the contention resolution message received by the terminal equipment is matched with the information in the message 3, the contention resolution is considered to be successful; or the terminal equipment judges whether the contention resolution is successful or not by receiving the PDCCH scrambled by the C-RNTI, and specifically, if the terminal equipment receives the PDCCH scrambled by the C-RNTI, the contention resolution is successful. When the contention resolution of the terminal equipment is successful, the identification information of the terminal equipment is updated from TC-RNTI to C-RNTI. At this point, the terminal device is still in an inactive state. If the contention resolution timer expires or expires, the terminal device does not receive the response message from the network device or the identification information in the response message received by the terminal device does not match the identification information of the terminal device in message 3, the contention resolution is considered to be failed. Optionally, the terminal device initiates the RA-SDT procedure again from step 1. In the embodiment of the present application, the initial stage of SDT may refer to a process in which the terminal device sends an initial uplink message to the network device and receives a contention resolution message from the network device in the RA-SDT process.

Step 5: the network device sends the authorized resources or messages to the terminal device, and the terminal device receives the authorized resources or messages from the network device. Specifically, the grant resource may be an uplink grant resource for the terminal device to send uplink data, and the message may be a downlink allocation resource or a downlink message scheduled by the network device, including a downlink RRC message, a downlink control information (downlink control information, DCI) message, and the like; it should be appreciated that when contention resolution is successful, if the BSR MAC CE, and/or SAI MAC CE is included in message 3, indicating that there is further subsequent data to be transmitted, the network device may schedule grant resources for subsequent transmissions of the data, including subsequent uplink and/or downlink transmissions, by means of dynamic scheduling.

The following data are as follows: (1) The initial data of the terminal device is a larger data volume than the data that can be accommodated by the first uplink grant (i.e. the initial uplink grant allocated in message 2), in which case the initial data of the terminal device needs to be segmented, and for the segmented data, the remaining data after the transmission on the first uplink grant resource is the subsequent data. (2) In the process of transmitting the current SDT data, new SDT data arrives, and the data can be called subsequent data.

Step 6: the terminal device transmits the subsequent data on the authorized resource.

It should be understood that if the assistance information of the terminal device, e.g., BSR or SAI, indicates no subsequent data transmission in step 3, steps 5 and 6 are not performed.

Step 7: the terminal device sends an RRCRelease message to the network device, terminating the RA-SDT procedure. Specifically, when the network device determines that the message 3 does not include the BSR MAC CE and/or the SAI MAC CE, that is, it is determined that there is no subsequent data to be transmitted, or the terminal device indicates that there is no subsequent small data to be transmitted based on the BSR or the SAI, the network device sends an RRCRelease message to the terminal device, and terminates the RA-SDT procedure. Correspondingly, the terminal equipment terminates the RA-SDT process after receiving the RRCRelease message, and suspends all configurations for small data transmission. The terminal device may continue to remain in the inactive state or enter the IDLE state (rrc_idle state).

(2) The CG-SDT process, as shown in fig. 3, is specifically as follows:

step 0: the network device sends the RRCRelease message to the terminal device in the inactive state or the connected state, and the terminal device in the inactive state or the connected state receives the RRCRelease message from the network device. The message includes configuration information for configuration authorization of small data transmission in an inactive state, signaling radio bearer configuration for small data transmission in an inactive state, and the like, and the radio bearer includes DRB and/or SRB. Optionally, the message may further comprise a data amount threshold for small data transmissions, and/or a reference signal received power RSRP threshold. Correspondingly, after receiving the RRCRelease message, the terminal device enters an rrc_inactive state. When the terminal device in the RRC_INACTIVE state satisfies the small data transmission condition and selects the CG-based small data transmission based on the CG-SDT selection criteria, the terminal device initiates a CG-SDT procedure. The small data transmission conditions include those that can be referred to in the RA-SDT procedure, and will not be described herein. In addition, CG resources for SDT are also included as available for small data transfer conditions based on configuration grants.

The terminal device selects CG-based small data transmission, further includes the terminal device configuring CG-SDT on the selected carrier, and the configured grant resources are valid, and if the configured CG-SDT resources are higher than a fifth threshold value based on a reference signal received power (synchronization signal based reference signal received power, ss-RSRP) of the synchronization signal, the terminal device selects CG-SDT. Wherein, the configured resource validity may include: the RSRP is not increased or decreased beyond a sixth threshold compared to the stored downlink path loss reference RSRP value at the last uplink transmission by the terminal device; wherein the fifth threshold is a threshold configured by the network device in system information or in an RRCRelease message for SSB selection; the sixth threshold is a threshold configured by the network device in the system information or in the RRCRelease message for CG validity determination or timing advance TA verification of the CG.

The terminal device initiates a CG-based small data transfer process, the terminal device selecting, according to a fifth threshold, synchronization signals and PBCH blocks (synchronization signal and PBCH block, SSB) above the fifth threshold, and CG configuration or CG resources associated with the SSB.

Step 1: the terminal device sends an initial uplink message to the network device, and the network device receives the initial uplink message from the terminal device. Specifically, the terminal device sends an initial uplink message on the selected CG resource. For the initial uplink message, reference may be made to the description in step 3 in the RA-SDT procedure. Correspondingly, after the terminal equipment sends the initial uplink message to the network equipment, a PDCCH monitoring timer is started to monitor the PDCCH so as to receive a response or a confirmation message from the network equipment; the PDCCH monitoring timer is used for the terminal equipment to monitor the PDCCH addressed to the C-RNTI in the CG-SDT process; an optional PDCCH listening timer is configured in the RRCRelease message. Optionally, if the initial uplink message includes a BSR MAC CE, the terminal device starts the retxBSR-Timer after sending the initial uplink message to the network device. Alternatively, the terminal device may recover the configured RBs for SDT, including DRBs and SRBs. PDCP configuration may also be restored, as well as mapping of QoS flows to DRBs; logical channel configuration may also be restored; RRC configuration, RLC configuration, etc. may also be restored.

Step 2: the network device sends a response message to the terminal device, and the terminal device receives the response message from the network device.

It should be appreciated that before the PDCCH listening timer expires or expires, the terminal device receives a response message from the network device, and the terminal device considers the initial uplink message transmission to be successful. If the PDCCH monitoring timer is overtime or expired, the terminal equipment does not receive the response message from the network equipment, and the initial uplink message transmission is considered to be failed. Specifically, the response message may be uplink grant or downlink allocation for new transmission, or may be DCI or RRC message, etc.; correspondingly, the terminal device retransmits the initial uplink message. It can be further understood that the CG-SDT transfer is resumed from step 1. It should be appreciated that the response message of the network device may be an acknowledgement message of the network device.

In the embodiment of the present application, the initial stage of SDT may refer to a process in which, in the CG-SDT process, the terminal device sends an initial uplink message to the network device, and receives a response message from the network device.

Step 3: optionally, the network device sends an authorized resource or message to the terminal device, and correspondingly, the terminal device receives the authorized resource or message from the network device. Specifically, the grant resource may be an uplink grant resource for the terminal device to send uplink data, and the message may be a downlink allocation resource or a downlink message scheduled by the network device, including a downlink RRC message, a DCI message, and the like; it should be appreciated that when the initial uplink message is successfully transmitted, if the initial uplink message includes a BSR MAC CE, a PHR MAC CE, and/or an SAI MAC CE, which indicates that there is further subsequent data to be transmitted, the network device may schedule the grant resources of the subsequent transmission for the subsequent data transmission in a dynamic scheduling manner. For the case of subsequent data, reference may be made to the description in step 5 in the RA-SDT procedure described above.

Step 4: the terminal device transmits the subsequent data on the authorized resource. Optionally, the terminal device may perform data transmission on an authorized resource dynamically scheduled by the network device; in addition, the terminal device may also use CG resources to perform subsequent data transmission in subsequent transmission, and specifically, send subsequent data on a next available opportunity of CG resources.

It should be understood that if in step 1, the assistance information of the terminal device, e.g. BSR or SAI, indicates that there is no subsequent data transmission, steps 3 and 4 are not performed.

Step 5: the network device sends an RRCRelease message to the terminal device, terminating the CG-SDT process. Specifically, when the network device determines that the message 3 does not include the BSR MAC CE and/or the SAI MAC CE, that is, it is determined that there is no subsequent data to be transmitted, or the terminal device indicates that there is no subsequent small data to be transmitted based on the BSR or the SAI, the network device sends an RRCRelease message to the terminal device, and terminates the CG-SDT procedure. Correspondingly, the terminal equipment terminates the CG-SDT process after receiving the RRCRelease message, and suspends all configurations for small data transmission. The terminal device may continue to remain in the inactive state or enter an IDLE state (RRC IDLE state) from the inactive state.

(3) Buffer status report BSR: is a way for the terminal device to apply uplink resources to the network device. When the terminal device and the network device need to perform data interaction, the terminal device needs to tell the network device about a request for data transmission, so that the network device can allocate uplink resources for the terminal device, and the terminal device also needs to tell the network device how much data needs to be transmitted. However, if the terminal device does not have uplink resources, the terminal device cannot send BSR MAC CE to the network device, and the terminal device may apply for resources in the following two ways, i.e., SR and random access. The network device can only be informed that data are needed to be sent by the network device in a mode of applying uplink resources by scheduling requests, namely, a request for applying resources is needed, but the size of the resources required to be applied is unknown, the terminal device also needs to tell the size of the resources applied to the network device in a BSR mode, and generally, after the network device receives the SR, the allocated resources at least can meet the transmission of the BSR. The way to acquire uplink resources through random access is to tell the network device the needed resource information by carrying BSR MAC CE in the random access message 3. The priority of the BSR is higher than the priority of the SR, and the priority of the SR is higher than the priority of the random access.

(4) Retransmission buffer status report Timer (retxBSR-Timer): the transmission of the case where the terminal device transmitted the BSR without receiving the UL grant from the network device late is reduced. Optionally, in the SDT procedure, the BSR is configured by default (default) MAC cell group configuration. In this configuration, the duration of the retxBSR-Timer is 80 subframes, i.e., 80ms. If at least one BSR is triggered and not cancelled, the terminal device starts or restarts the Timer retxBSR-Timer if resources for uplink new transmission are available and the BSR MAC CE plus its subheader can be accommodated. The retbsr-Timer is restarted when an grant for a new transmission is received from the network device on any uplink shared channel (uplink shared channel, UL-SCH). When the retxBSR-Timer times out and any one of the logical channels in any one of the logical channel groups (logic channel group, LCG) of the terminal device has data to transmit, a BSR, which may also be referred to as a regular BSR, is triggered. When the regular BSR is triggered and the timer delaying the SR transmission is not running, the terminal device triggers the SR if there is no resource for uplink transmission. Since the network device will not configure SR resources in the SDT procedure, i.e. since there are no resources for SR, the terminal device will trigger the random access procedure.

(5) Radio resource control, RRC, state, the terminal device has 3 RRC states: an RRC CONNECTED state (rrc_connected state), an RRC IDLE state (rrc_idle state), and an RRC INACTIVE state (rrc_inactive state). The "connected state" and "RRC connected state" are the same concept, and the two designations are interchangeable herein): the terminal device establishes an RRC connection with the network, and can perform data transmission. Herein, "idle state" and "RRC idle state", are the same concept, and the two designations are interchangeable): the terminal device does not establish an RRC connection with the network and the base station does not store the context of the terminal device. If the terminal device needs to enter the RRC connected state from the RRC idle state, an RRC connection establishment procedure needs to be initiated. Herein, "deactivation dynamics", "deactivation state", "RRC deactivation state" and "RRC deactivation state", are the same concept, and these several designations are interchangeable): the terminal device has previously entered the RRC connected state and then the network device releases the RRC connection, but the network device maintains the context of the terminal device. If the terminal device needs to enter the RRC connected state again from the RRC inactive state, an RRC connection recovery procedure needs to be initiated. Compared with the RRC establishment process, the RRC recovery process has shorter time delay and smaller signaling overhead. But the network device needs to save the context of the terminal device, which occupies the memory overhead of the base station.

In RA-SDT or CG-SDT, after the terminal device sends a second message or a first message to the network device, where the first message may be referred to as an initial uplink message, a contention resolution Timer or a PDCCH listening Timer may be started, when the second message or the first message includes BSR information, for example, BSR MAC CE, the terminal device starts a retransmission buffer status report Timer (retxbr-Timer), optionally, the duration of the retxbr-Timer is longer than the duration of the contention resolution Timer or the duration of the PDCCH listening Timer, in case of contention resolution failure, or in case of a timeout of the PDCCH listening Timer or in case of not receiving a response message from the network device, that is, in case of an initial uplink message transmission failure, the retxbr-Timer continues to run until the timeout, after the timeout of the retxbr-Timer, since the logical channel contains data to be transmitted, the terminal device triggers a regular (regular) BSR, but in case of no random resources for transmitting the BSR, the terminal device triggers an SR, in case of no random resources are configured for the terminal device in the SDT or the network device, and the terminal device does not access to the SR. However, the terminal device re-performs the RA-SDT random access procedure or the initial uplink message transmission (i.e. re-transmission) of the CG-SDT when the contention resolution fails, and the terminal device does not establish a connection with the network device, and the RA-SDT is in progress and introduces PUCCH resources not used for SR to trigger the random access procedure, or the terminal device selects PUCCH resources not used for SR to trigger the random access procedure, which may cause network abnormality due to the RA-SDT procedure or the CG-SDT procedure, i.e. the terminal device does not establish a connection with the network device, so the embodiments of the present application propose the following solutions in order to solve the above problems.

Referring to fig. 4, fig. 4 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S401: the terminal device sends a first message and starts a first timer.

Optionally, the terminal device sends a first message to the network device, and starts a first timer.

Specifically, the terminal device is in an RRC inactive state or an RRC idle state, and the terminal device is in an SDT process or an early data transmission (early data transmission, EDT) process, which may also be understood that the execution of step S401 and step S402 is in an SDT process or an EDT process.

Specifically, the first message may satisfy at least one of: the first message is carried in a common control channel (common control channel, CCCH) message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; or the first message is the first message transmitted on PUSCH in the SDT procedure, and the message transmitted on PUSCH includes a CCCH message, where the CCCH message may be an RRC recovery request message. When the first message is a first message or a second message sent by the terminal device to the network device in the SDT process, the number of times of transmission of the first message is not limited, and the first message may be transmitted one or more times, and if the first message is transmitted multiple times, the first message may be a retransmission message of the first message or a retransmission message of the second message sent by the terminal device to the network device in the SDT process. The first message may be an initial uplink message in the CG-SDT process, and the second message may be message 3 (msg 3) in the RA-SDT process. The first message may satisfy an alternate description of each of at least one of: the first message is a message transmitted by a first Transport Block (TB) in the SDT process; the first message is an initial transfer message in the SDT process; the first message is a message contained in an initial transmission message in the SDT procedure; or the first message is a message of an initial PUSCH transmission in the SDT procedure.

Specifically, the first message may include a BSR MAC CE. The method comprises the following steps: if at least one BSR is triggered and not cancelled, optionally, the at least one BSR is a BSR corresponding to a BSR MAC CE of a logical channel or a logical channel group of the SDT; if uplink shared channel resources for a new transmission are available and the size of the uplink shared channel resources may include the BSR MAC CE plus the size of its sub-header according to the logical channel priority result, the first message may include the BSR MAC CE. Optionally, the size of the uplink shared channel resource may include the size of the BSR MAC CE plus its sub-header, which may mean that the size of the uplink shared channel resource is greater than or equal to the size of the BSR MAC CE plus its sub-header. Alternatively, the first message may be a BSR MAC CE. Optionally, the first message may further include PHR MAC CE, SAI MAC CE. The first message includes a buffer data allowance in the SDT process indicated by the BSR MAC CE, and the network device may determine a data amount of the terminal device based on the BSR MAC CE, and a subsequent transmission condition.

Alternatively, the first message may be replaced by a BSR, i.e. the terminal device sends the BSR to the network device, starting the first timer.

Specifically, the first Timer may be a retxBSR-Timer. For example, the duration of the retxBSR-Timer may be 80ms.

Step S402: if the first message transmission is unsuccessful, the terminal device stops the first timer.

Specifically, the unsuccessful transmission of the first message may be an optional condition. The unsuccessful transmission of the first message may mean that the second timer times out, or that the second message is received before the second timer times out but the first identifier in the second message does not match the second identifier in the first message, or that the second message is received before the second timer times out but the second message indicates a negative-acknowledgement (NACK), wherein the second message may be a response message or an acknowledgement message of the first message. The second timer timeout may be understood as that the terminal device does not receive the second message before the second timer expires or until the second timer expires. Alternatively, the terminal device may start the second timer after sending the first message. The second timer may be a contention resolution timer or a PDCCH listening timer. For example, in the RA-SDT procedure, the second timer is a contention resolution timer; in the CG-SDT process, the second timer is a PDCCH listening timer. When the second Timer is a PDCCH listening Timer, the second Timer is used for the terminal device to listen to the PDCCH to receive a response message or an acknowledgement message of the network device, for example, the PDCCH listening Timer may be a contention resolution Timer, or a configuration grant based small data transmission Timer (CG-SDT-Timer) in CG-SDT procedure. It can be appreciated that when the PDCCH listening timer runs, the terminal device listens to or receives DCI, or a physical downlink control channel PDCCH or layer 1 feedback, or uplink grant, or downlink feedback, or a hybrid automatic repeat request (hybrid automatic repeat query, HARQ) message, or an automatic repeat request (automatic repeat query, ARQ) message, or an RRC message. Optionally, if the PDCCH monitoring timer runs, the terminal device monitors the PDCCH. Optionally, the time period of the first timer is longer than the time period of the second timer. The second timer timeout may be understood as exceeding a contracted or configured length of the second timer, e.g. the length of the second timer is 64ms, the second timer does not timeout until 64ms when starting from the time the second timer starts, and the second timer times out when greater than 64 ms. It should be appreciated that the second timer timeout may also be referred to as the expiration of the second timer.

In particular, a first identity in the second message not matching a second identity in the first message or the second message indicating a negative acknowledgement may refer to the first identity in the second message not matching the second identity in the first message or the second message indicating a NACK before or during the second timer has timed out. The first identifier and the second identifier may be used to identify the terminal device, and the first identifier and the second identifier may be the same or different, and a mismatch between the first identifier and the second identifier may mean that the values of the first identifier and the second identifier are different, or that a part of the values in the first identifier may be different from the second identifier. The second identifier may be a unique identifier of the terminal device, such as a 5G-S-TMSI, a C-RNTI, or a random value, or may be a CCCH service data unit (service data unit, SDU). For example, in one example, in the RA-SDT procedure, for a four-step random access procedure, the first message may be message 3, the second message may be message 4, the message 3 includes a second identity, i.e., a C-RNTI, and the message 4 includes a first identity, i.e., a contention resolution identity, where the contention resolution identity in the message 4 is different from the C-RNTI included in the message 3, e.g., the C-RNTI value in the message 3 is hexadecimal 0001, and the contention resolution identity in the message 4 is hexadecimal 0002, and then the first identity, i.e., hexadecimal 0002, is considered to be mismatched with the second identity hexadecimal 0001; if the message 3 contains a second identifier, i.e. a CCCH SDU, and the message 4 contains a first identifier, i.e. a contention resolution identifier, wherein the contention resolution identifier in the message 4 is different from the first 48 bits of the CCCH SDU in the message 3, the first identifier, i.e. the contention resolution identifier, is considered to be not matched with the second identifier, i.e. the CCCH SDU. In yet another example, in the two-step random access procedure, the first message may be an msgA message, the second message may be an msgA message, the msgA message includes a second identifier, i.e., a CCCH SDU, and the MsgB message includes a first identifier, i.e., a contention resolution identifier, where the 48 bits in the msgA message in the contention resolution identifier MAC CE are not identical to the first 48 bits of the CCCH SDU sent in the msgA message, and the first identifier and the second identifier are considered to be not matched. In yet another example, in the CG-SDT procedure, the PDCCH received by the terminal device is not scrambled by the C-RNTI of the terminal device in the current cell, but may also be understood as the first identity in the second message does not match the second identity in the first message. The msgA message in the two-step random access process can be understood as a message 1 and a message 3 in the four-step random access process, and the MsgB message in the two-step random access process can be understood as a message 2 and a message 4 in the four-step random access process.

Specifically, the second message may include at least one of: contention resolution messages, PDCCH transmission messages scrambled by a C-RNTI, PDCCH transmission messages scrambled by a configuration scheduling radio network temporary identity (configured scheduling radio network tempory identity, CS-RNTI), or radio resource control, RRC, messages. Where the second message comprises a contention resolution message, it is understood that the second message may be message 4 (msg 4) or message B (MsgB) in the RA-SDT procedure. Optionally, when the second message includes a PDCCH transmission message scrambled by the C-RNTI or the second message is a PDCCH transmission message scrambled by the C-RNTI, the terminal device may be in RA-SDT or CG-SDT, and optionally, when the second message is a PDCCH message scrambled by the C-RNTI, the PDCCH message scrambled by the C-RNTI may indicate uplink grant or downlink allocation for new transmission. When the second message includes a PDCCH transmission message scrambled by the CS-RNTI, optionally, the terminal device may be in CG-SDT procedure, and optionally, the uplink grant or downlink allocation for retransmission may be indicated in the PDCCH transmission message scrambled by the CS-RNTI. Alternatively, the second message may include an alternative description of each of at least one of the following: the second message may be: DCI, or a layer 1 feedback message or HARQ feedback or ARQ feedback or a message of physical downlink shared channel PDSCH transmission.

Optionally, if the first message transmission is successful, the terminal device stops the first timer. The successful transmission of the first message may mean that the second message is received before the second timer times out, or that the second message is received before the second timer times out and the first identifier in the second message matches the second identifier in the first message, or that the second message is received before the second timer times out and the second message indicates an Acknowledgement (ACK), where the second message is a response message or an acknowledgement message of the first message. Specifically, the first message transmission success includes at least one of: the terminal device receives the contention resolution message, the terminal device receives the PDCCH transmission message scrambled by the C-RNTI, the terminal device receives the PDCCH transmission message scrambled by the CS-RNTI, or the terminal device receives the RRC message. The terminal device receiving the contention resolution message may be understood as the terminal device receiving message 4 (msg 4) or message B (MsgB) from the network device in the RA-SDT procedure. The terminal device receiving the PDCCH transmission message scrambled by the C-RNTI may be understood as that the terminal device monitors the PDCCH transmission message scrambled by the CS-RNTI, and the terminal device may be in the RA-SDT process or in the CG-SDT process, or may alternatively be in the CG-SDT process, where the C-RNTI-scrambled PDCCH message may indicate uplink grant or downlink allocation for a new transmission. The terminal device receiving the PDCCH transmission message scrambled by the CS-RNTI may be understood as that the terminal device monitors the PDCCH transmission message scrambled by the CS-RNTI, optionally, the terminal device may be in the CG-SDT process, and optionally, the PDCCH transmission message scrambled by the CS-RNTI may indicate uplink grant or downlink allocation for retransmission. Optionally, the first message transmission success may include an alternative description of each of at least one of: the terminal device receives DCI, the terminal device receives a layer 1 feedback message, the terminal device receives an ARQ Acknowledgement (ACK) message, or the terminal device receives an HARQ acknowledgement message. For example, for the RA-SDT procedure, the first message transmission is successful, and it can be understood that it includes, but is not limited to, if the terminal device receives the C-RNTI scrambled PDCCH, the terminal device considers the contention resolution successful; or if the identification information carried by the terminal equipment in the msg3 message is matched with the information in the msg4 message, or the identification information carried by the terminal equipment in the msgA message is matched with the information in the MsgB message. For example, in CG-SDT procedure, the success of the first message transmission may be understood as the terminal device receiving an acknowledgement message for the first message from the network device, and may further be understood as including, but not limited to: before the PDCCH monitoring timer is overtime, the terminal device receives the uplink authorization of the dynamic scheduling of the network device, or receives the downlink allocation of the dynamic scheduling of the network device, or DCI or MAC CE, or layer 1ACK, or downlink feedback information (downlink feedback information, DFI) or ARQ ACK.

In the method, a new condition for stopping the first timer is introduced, and the first timer is not successfully stopped by the first message transmission, so that the triggering of the regular BSR due to the overtime of the first timer can be reduced, and further, the triggering of the scheduling request SR due to the lack of authorized resources is reduced, and the occurrence of the condition of triggering the random access due to the lack of SR resources is reduced.

Referring to fig. 5, fig. 5 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S501: the terminal device sends a first message and starts a first timer.

Specific reference may be made to step S401, and details thereof are not repeated here.

Step S502: if the first timer times out, the logical channel of the terminal device contains uplink data, and the first condition is satisfied, the terminal device triggers the first BSR.

Specifically, the first timer timeout may be understood as exceeding a predetermined duration or a configured duration of the first timer, for example, the duration of the first timer is 80ms, when the first timer starts to count until the 80ms first timer is not timed out, and when the first timer is greater than 80ms, the first timer is timed out. The logic channel containing uplink data may refer to data to be transmitted by the logic channel or buffered data by the logic channel. Alternatively, the logical channels may correspond to the SDT RBs in a one-to-one or one-to-many manner, which is not limited herein. Wherein, the alternative description corresponding to the SDT RB by the logic channel can be: the logical channel is a channel related to the SDT RB, and the logical channel is a channel for the SDT.

Specifically, the first condition includes the first timer timing out until the first message transmission is successful, or the first message transmission is successful until the first timer timing out. The first timer timeout until the first message transmission is successful may be understood as the first timer first timeout until the first message transmission is successful triggering the first BSR, and may be further understood as: if the first timer times out, the logic channel contains uplink data, and the first uplink message is successfully transmitted, and the terminal equipment triggers a first BSR. Wherein the first timer times out before the first uplink message is successfully transmitted. In one example, the first timer times out at time T1 and the first message is successfully transmitted at time T2, wherein time T2 is temporally after time T1, then the terminal device does not trigger the first BSR at time T1 until time T2 or after time T2. Optionally, the first BSR includes a regular BSR. The first message is successfully transmitted until the first timer expires, which may be understood as that the first message is successfully transmitted before the first timer expires to trigger the first BSR, which may be further understood as: if the first timer times out and the first timer times out after the first uplink message is successfully transmitted, the logic channel comprises uplink data, and the terminal equipment triggers a first BSR. In another example, the first message transmission is successful at time T3 and the first timer times out at time T4, where time T3 precedes time T4 in time, then the terminal device may trigger the first BSR at time T4 or after time T4.

Specifically, the first message transmission success includes at least one of: the terminal device receives the contention resolution message, the terminal device receives the PDCCH transmission message scrambled by the C-RNTI, the terminal device receives the PDCCH transmission message scrambled by the CS-RNTI, or the terminal device receives the RRC message. Specific reference may be made to the description of step S402, and details are not repeated here.

Optionally, if the first timer times out, the logical channel of the terminal device includes uplink data, and the first condition is not satisfied, and the terminal device does not trigger the first BSR.

In the method, a new condition for triggering the BSR is introduced, and by means of triggering the first BSR when the first timer is overtime and the logic channel contains uplink data and the first condition is met, the occurrence of triggering the first BSR when the terminal equipment and the network equipment are not connected can be reduced, further, the condition that a Scheduling Request (SR) is triggered due to no authorization and random access is triggered due to no SR resource is reduced, so that the terminal equipment can continue to perform the current SDT process, the access abnormality of the terminal equipment is reduced, the identification and the processing of the access abnormality of the network equipment to the terminal equipment are further improved, and the access success rate of the SDT is further improved.

Referring to fig. 6, fig. 6 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S601: the terminal device sends a first message and starts a first timer.

Specifically, the terminal device is in an RRC inactive state or an RRC idle state, and the terminal device is in an SDT process or an EDT process, which may also be understood that the execution of steps S601-S603 is in an SDT process or an EDT process.

Specifically, the first message may include a BSR MAC CE. Reference may be made specifically to the description in step S401, and no further description is given here.

Specifically, the first message may satisfy at least one of: the first message is carried in a CCCH message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; or the first message is the first message transmitted on PUSCH in the SDT procedure, and the message transmitted on PUSCH includes a CCCH message, where the CCCH message may be an RRC recovery request message. Reference may be made specifically to the description in step S401, and no further description is given here.

Step S602: if the first timer times out and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report, regular BSR.

Specifically, the first timer timeout may be understood as a duration exceeding the agreed duration or the configured duration of the first timer, and the description in step S502 may be referred to, which is not repeated herein. The logic channel containing uplink data may refer to data to be transmitted by the logic channel or buffered data by the logic channel. Alternatively, the logical channels may correspond to the SDT RBs in a one-to-one or one-to-many manner, which is not limited herein. Wherein, the alternative description corresponding to the SDT RB by the logic channel can be: the logical channel is a channel related to the SDT RB, and the logical channel is a channel for the SDT.

Step S603: if the regular BSR is triggered, there is no available uplink resource, and if the regular BSR is not triggered in an inactive state or is not triggered in an SDT procedure, the terminal device triggers a scheduling request SR.

Specifically, if the regular BSR is triggered, there is no available uplink resource, and optionally, the regular BSR is not triggered in the RRC inactive state or is not triggered in the SDT procedure, the terminal device triggers the scheduling request SR. Further, if the regular BSR is triggered, optionally, a timer delaying the SR is not running, there are no available uplink transmission resources, optionally, the regular BSR is not triggered in an inactive state or is not triggered during the SDT, and the terminal device triggers the SR. Alternatively, the resource without available uplink transmission may refer to the resource without available uplink new transmission. The resource of the uplink transmission not being available may refer to either no resource or a resource but not available.

Specifically, the regular BSR is not triggered in an inactive state or triggered in an SDT procedure, which may mean that the regular BSR is not triggered in an initial stage in the SDT procedure, or that the regular BSR is triggered after contention resolution is successful in the SDT procedure, or that the regular BSR is triggered when contention resolution is successfully completed in the SDT procedure, or that the regular BSR is triggered after random access procedure of RA-SDT is successfully completed, or that the regular BSR is triggered after the first message transmission is successfully completed, or that the first message transmission is successfully completed when the regular BSR is triggered, or that the regular BSR is triggered in case that the terminal device and the network device establish a connection, or that the regular BSR is triggered after the terminal device receives an acknowledgement message for the first message from the network device; or the regular BSR is triggered by the terminal device upon receipt of a response message from the network device for the first message, or the regular BSR is triggered after the terminal device receives a PDCCH transmission message scrambled by a C-RNTI, or the regular BSR is triggered after the terminal device receives a PDCCH transmission message scrambled by a CS-RNTI, or the regular BSR is triggered after the terminal device receives an RRC message, or the regular BSR is triggered after the terminal device receives a DCI or DFI or HARQ or ARQ, optionally the DCI or DFI or HARQ or ARQ is a response message or acknowledgement message for the terminal device first message. Wherein the regular BSR is triggered after the terminal device receives an acknowledgement message from the network device for the first message, it is also understood that the regular BSR is triggered when the terminal device receives an acknowledgement message from the network device for the first message. The regular BSR being triggered by the terminal device upon receipt of a response message from the network device for the first message may include the regular BSR being triggered by the terminal device upon receipt of a response message from the network device for the first message, and/or the regular BSR being triggered by the terminal device upon receipt of a response message from the network device for the first message. The regular BSR is triggered after the terminal device receives the PDCCH transmission message scrambled by the C-RNTI, and it can also be understood that the regular BSR is triggered when the terminal device receives the PDCCH transmission message scrambled by the C-RNTI. The regular BSR is triggered after the terminal device receives the PDCCH transmission message scrambled by the CS-RNTI, and it can also be understood that the regular BSR is triggered when the terminal device receives the PDCCH transmission message scrambled by the CS-RNTI. The regular BSR is triggered after the terminal device receives the RRC message, and it may be understood that the regular BSR is triggered when the terminal device receives the RRC message.

It should be noted that, in the embodiment of the present application, alternatively, "after …" may be understood as "in the case of …", or "not before …", or "at …". For example, it is understood that the regular BSR is triggered after the contention resolution in the SDT process is successful, that the regular BSR is triggered in case of the contention resolution in the SDT process is successful, or that the regular BSR is not triggered before the contention resolution in the SDT process is successful, or that the regular BSR is triggered when the contention resolution in the SDT process is successful.

In one possible implementation, the method further includes: if the terminal equipment triggers the SR and there is no PUCCH resource for the SR, the terminal equipment triggers random access.

In one possible implementation, if the regular BSR is triggered, optionally, the timer delaying the SR is not running, there are no available uplink resources, optionally, the regular BSR is triggered in an inactive state or triggered during the SDT, and the terminal device does not trigger the SR.

The negative description that the regular BSR is triggered in the inactive state or in the SDT process is that the regular BSR is not triggered in the inactive state or in the SDT process may refer to the above mentioned description that the regular BSR is not triggered in the inactive state or in the SDT process, and will not be repeated here.

In the method, a new condition for triggering the SR is introduced, by triggering the regular BSR, no available uplink transmission resource exists, and the manner that the terminal device triggers the scheduling request SR is not triggered in an inactive state or in the process of small data transmission SDT, the manner that the terminal device triggers the scheduling request SR is reduced under the condition that the terminal device and the network device are not connected, and further the condition that the scheduling request SR is triggered due to the fact that no authorized resource exists is reduced, and further the condition that random access is triggered due to the fact that no SR resource exists is reduced, so that the terminal device can continue to perform the current SDT process, the access abnormality of the terminal device is reduced, the recognition and the processing of the access abnormality of the terminal device by the network device are further improved, and the access success rate of the SDT is further improved.

Referring to fig. 7, fig. 7 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S701: the terminal device sends a first message and starts a first timer.

Reference may be made specifically to the description in step S601, and no further description is given here.

Step S702: if the first timer times out and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report, regular BSR.

Reference may be made specifically to the description in step S602, and no further description is given here.

Step S703: if the regular BSR is triggered, there is no available uplink transmission resource, and the terminal device triggers a scheduling request SR.

Alternatively, the resource without available uplink transmission may refer to the resource without available uplink new transmission. The resource of the uplink transmission not being available may refer to either no resource or a resource but not available.

Step S704: if the SR is triggered, the logic channel of the terminal device has uplink data, no resource is used for the SR, and the terminal device triggers a random access process when the second condition is met.

Specifically, the logic channel includes uplink data may refer to data to be transmitted by the logic channel or buffered data of the logic channel. Alternatively, the logical channels may correspond to the SDT RBs in a one-to-one or one-to-many manner, which is not limited herein. Wherein, the alternative description corresponding to the SDT RB by the logic channel can be: the logical channel is a channel related to the SDT RB, and the logical channel is a channel for the SDT.

Specifically, the resource not used for SR may refer to PUCCH resource not used for SR. The second condition may include one or more of: the terminal equipment receives the competition resolving message, receives a response message or an acknowledgement message for the first message from the network equipment, and the first message is successfully transmitted and the SDT is successfully transmitted in the initial stage. The terminal device receiving the contention resolution message may be understood as successful contention resolution in the RA-SDT procedure. When the terminal device receives a response message or an acknowledgement message for the first message from the network device, the physical downlink shared channel (physical downlink shared channel, PDSCH) or RRC message, etc. is optionally DCI, HARQ, ARQ, DFI, PDCCH. The success of the first message transmission may be understood as the terminal device receiving a response message or an acknowledgement message for the first message from the network device, e.g. optionally DCI, HARQ, ARQ, DFI, PDCCH, PDSCH or RRC message, etc. The successful transmission at the initial stage of the SDT may be understood as a process in which the terminal device transmits a first message to the network device and receives a contention resolution message from the network device in the RA-SDT process; or, in the CG-SDT process, the terminal device sends the first message to the network device, and receives a response message from the network device.

In the method, a new random access triggering condition is introduced, if the SR is triggered, the logic channel of the terminal equipment has uplink data and no available uplink transmission resource, and if the first message meets the second condition, the mode of triggering the random access process can reduce the triggering of the first BSR by the terminal equipment and the network equipment under the condition that the connection is not established, thereby reducing the triggering of the scheduling request SR due to the fact that the SR resource is not authorized, and further reducing the condition that the random access is triggered due to the fact that the SR resource is not available.

Referring to fig. 8, fig. 8 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S801: the terminal device sends a first message.

Specifically, the terminal device is in an RRC inactive state or an RRC idle state, and the terminal device is in an SDT process or an EDT process, which may also be understood that the execution of step S801 and step S802 is in an SDT process or an EDT process.

Optionally, the terminal device sends the first message to the network device.

Specifically, the first message includes the BSR MAC CE, and specific reference may be made to the description related to step S401, which is not described herein.

Step S802: the terminal device starts a first timer if the first message satisfies at least one of the following.

Optionally, if it is determined that at least one BSR is triggered and not cancelled, if an uplink shared channel resource for a new transmission is available, and the size of the uplink shared channel resource may include the size of the BSR MAC CE plus its subheader according to the logical channel priority result, the terminal device generates the BSR MAC CE in the multiplexing and assembling process, and if the terminal device satisfies at least one of the following, the first timer is started.

Specifically, at least one item includes: the first message is not carried in a CCCH message; the first message is not a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; the first message is not the first message transmitted on PUSCH in the SDT process, and the message transmitted on PUSCH includes a CCCH message, where the CCCH message may be an RRC resume request message; or the first message transmission is completed successfully. Specifically, the description of at least one item may be described with reference to step S401, which is not repeated here. The first message transmission success includes at least one of: the terminal equipment receives the contention resolution message, the terminal equipment receives the PDCCH transmission message scrambled by the C-RNTI, the terminal equipment receives the PDCCH transmission message scrambled by the CS-RNTI, and the terminal equipment receives the RRC message. The explanation about the success of the first message transmission may be specifically described with reference to step S502, and will not be repeated here.

Alternatively, the first message may be replaced by a BSR, i.e. the terminal device starts the first timer if the BSR satisfies at least one of the following.

In one possible implementation, the terminal device does not start the first timer if the first message meets at least one of: the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; the first message is a first message transmitted on a PUSCH in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is not completed successfully; specific reference may be made to step S401, and details are not repeated here. The first message not being successfully transmitted includes at least one of: the terminal equipment does not receive the contention resolution message, the terminal equipment does not receive the PDCCH transmission message scrambled by the C-RNTI, the terminal equipment does not receive the PDCCH transmission message scrambled by the CS-RNTI, or the terminal equipment does not receive the RRC message; specifically, the description of at least one item may be described with reference to step S401, which is not repeated here.

The alternative description of step S802 may be: if the first message is triggered in the SDT process, starting or restarting a first timer if the initial uplink transmission of the SDT is successfully completed; otherwise, if the first message is not triggered during the SDT process, the first timer is started or restarted.

Specifically, the first message includes or is a BSR MAC CE. Optionally, the first message satisfies at least one of: the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; the first message is a first message transmitted on a PUSCH in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is not completed successfully. Specific reference may be made to step S401, and details are not repeated here.

Alternatively, the initial uplink transmission success of the SDT may be understood as that the alternative description may be that the terminal device receives the contention resolution message, or the terminal device receives the PDCCH transmission message scrambled by the C-RNTI, or the terminal device receives the PDCCH transmission message scrambled by the CS-RNTI, or the terminal device receives the RRC message. It can also be understood that the terminal device receives DCI, or a layer 1 feedback message or HARQ feedback or ARQ feedback or a message of physical downlink shared channel PDSCH transmission.

In the method, a new condition for starting the first timer is introduced, and the first timer is started by the first message to meet at least one of the following conditions, so that the triggering of the first BSR by the terminal equipment and the network equipment under the condition that connection is not established can be reduced, further, the triggering of the scheduling request SR due to the fact that no authorized resource exists is reduced, and the triggering of random access due to the fact that no SR resource exists is reduced.

Referring to fig. 9, fig. 9 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S901: the terminal device sends a first message and starts a first timer.

Specific reference may be made to step S401, and details are not repeated here.

Step S902: if the first message transmission is unsuccessful, the terminal device does not trigger or ignore or discard the first random access if the first timer expires.

Specifically, the unsuccessful transmission of the first message may be an optional condition, and the detailed description of the step S402 may be referred to for details, which are not repeated here. The first timer timeout may refer to the description in step S502, and will not be described herein. The first random access refers to triggering a random access procedure since there is no PUCCH resource for SR.

Specifically, the terminal device does not trigger or ignore or discard the first random access, including: if the terminal device does not have PUCCH resources for SR, the terminal device does not trigger or ignore or discard the first random access. Optionally, the first message is sent during a random access procedure based on a second random access SDT, i.e. RA-SDT; wherein the priority of the first random access is lowest; or the priority of the first random access is lower than the priority of the second random access. That is, the priority of triggering random access due to no PUCCH resource for SR is lower than that of random access in RA-SDT procedure. It can also be understood that, in the random access procedure of RA-SDT being performed, if the random access procedure is triggered due to no SR resource, the random access triggered due to no SR resource has a lower priority than the random access procedure of RA-SDT, the terminal device ignores or discards the random access triggered due to no SR resource and continues the current RA-SDT procedure; it should be understood that the terminal device triggers another random access while it is performing the RA-SDT random access procedure, and the terminal device chooses to continue the current RA-SDT procedure by way of implementation.

Optionally, the first message is sent during CG-SDT. The terminal device, by way of implementation, chooses to discard or ignore random access triggered by the lack of resources for SR, while continuing the current CG-SDT procedure.

In the method, through the way that the first message transmission is unsuccessful and the first timer is overtime, the terminal equipment does not trigger or ignore or discard the first random access, the situation that the random access is triggered due to the fact that the SR resource is not available is reduced under the condition that the network equipment and the terminal equipment are not connected, so that the terminal equipment can continue to perform the current SDT process, the access abnormality of the terminal equipment is reduced, the identification and the processing of the access abnormality of the terminal equipment by the network equipment are reduced, and the access success rate of the SDT is further improved. Further, for RA-SDT, the occurrence of the RA-SDT suspension condition caused by another random access trigger in the random access process of RA-SDT is reduced; for CG-SDT, the occurrence of suspension or abnormal situation of CG-SDT caused by random access triggered by no SR resource is reduced under the condition that CG-SDT is not successfully accessed, and the access success rate of the small data transmission process is further improved.

Referring to fig. 10, fig. 10 is a communication method according to an embodiment of the present application, including but not limited to the following steps:

step S1001: the terminal device sends a first message.

Alternatively, the terminal device may send the first message to the network device.

Optionally, the first message may satisfy at least one of: the first message is carried in a CCCH message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process; or the first message is a first message transmitted on a PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.

Optionally, the first message is transmitted on a configured grant resource.

Step S1002: the terminal device sends a third message.

Alternatively, the terminal device may send a third message to the network device. The third message may be a retransmission message of the first message. For example, in step 3 in fig. 2 or in step 1 in fig. 3, the terminal device sends an initial uplink message to the network device, and if the initial uplink message fails to be transmitted, for example, a response message of the network device is not received within a preset time, the terminal device needs to retransmit the initial uplink message, optionally, needs to transmit multiple times, and the terminal device sends a third message, that is, a retransmission message of the initial uplink message. For example, in the embodiment described in fig. 4-9, the third message is a retransmission message of the first message.

Optionally, the first message is an initial transmission message in a CG-SDT process, and the third message is an autonomous retransmission message of the initial transmission, where autonomous transmission of the third message on a configured grant resource in the CG-SDT process uses a fixed RV number. Optionally, the fixed RV of the third message is the same as the RV of the first message.

Specifically, the redundancy version (redundancy version, RV) used by the third message is the same as the RV version of the first message or the initial upstream message. Optionally, the redundancy version RV number of the third message is a positive integer, for example 0, or 1, or 2, or 3, or 4.

Optionally, the third message is transmitted on a configured grant resource.

It should be noted that the embodiments of the present application may be applied to a small data transmission process based on two-step random access. Any combination can be performed between different embodiments in the present application; any combination of steps of the same embodiment can be adopted; steps of different embodiments can be arbitrarily combined; wherein fig. 2 or 3 may be combined with any of fig. 4-10. Fig. 2 or fig. 3 may be combined with any of the steps in fig. 4 to fig. 9, for example, the method shown in fig. 2 may be combined with the method shown in fig. 4, for example, S401 may be step 3 in fig. 2, or step 1 in fig. 2, steps 2 and S401 in fig. 2, S402 may form a scheme, or any one or more steps in fig. 2 and any one or more steps in fig. 4 may be combined into a scheme. The steps of the different figures, and the different embodiments, may also be partially combined, and the application is not limited thereto. Certain steps in embodiments of the application are not necessarily performed in exact order. In some cases, the order between the different steps is not sequential, (i.e., it is understood that steps may be performed sequentially in an alternate embodiment); different steps may also be performed simultaneously; the application is not limited in this regard. The embodiments of the communication method provided by the present application are illustrative only and not limiting in any way. For example, some or some of the steps in any of the embodiments of the communication method above may be omitted, i.e., the device (e.g., terminal device or network device) may not perform the omitted steps.

The foregoing details of the method according to the embodiments of the present application and the apparatus according to the embodiments of the present application are provided below.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a communication device 1100 according to an embodiment of the present application, where the communication device 1100 may include a communication unit 1101 and a processing unit 1102, and the details of the respective units are as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101, and start a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit 1102 is configured to stop the first timer if the first message transmission is unsuccessful.

In a further possible implementation, the communication unit 1101 is further configured to not receive the second message before the second timer expires; or, receiving a second message before a second timer expires, but the first identity in the second message does not match the second identity in the first message; or, receiving a second message before the second timer expires, the second message indicating a negative acknowledgement, NACK; wherein the second message is a response message to the first message.

In yet another possible implementation manner, the second timer times out, or the communication unit 1101 is configured to receive a second message when the second timer is running, where a first identifier in the second message does not match a second identifier in the first message; alternatively, in case the second timer is running, a second message is received, said second message indicating a negative acknowledgement, NACK.

In yet another possible implementation, the second message is a response message to the first message.

In a further possible implementation, the communication unit 1101 is configured to not receive the second message if the second timer expires.

In yet another possible implementation, the first message satisfies at least one of: the first message is carried in a Common Control Channel (CCCH) message; the first message is a first message or a second message sent to the network equipment in the SDT process of small data transmission; or the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message.

In yet another possible implementation, the BSR corresponding to the BSR MAC CE is triggered and not cancelled; the first message includes the BSR MAC CE if uplink shared channel resources for a new transmission are available and the size of the uplink shared channel resources may include the BSR MAC CE plus the size of its sub-header.

In yet another possible implementation, the apparatus is in an RRC inactive state or an RRC idle state.

In yet another possible implementation, the apparatus is in a small data transmission process or a data early transmission process.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 4.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is configured to trigger a first BSR when the first timer expires, where a logical channel of the apparatus includes uplink data, and a first condition is satisfied, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

In one possible implementation, the first message transmission success includes at least one of: and receiving a contention resolution message, receiving a Physical Downlink Control Channel (PDCCH) transmission message scrambled by a cell radio network temporary identifier (C-RNTI), receiving a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identifier (CS-RNTI), receiving a Radio Resource Control (RRC) message, and receiving an automatic repeat request acknowledgement (ARQ ACK) message by the terminal equipment or receiving a hybrid automatic repeat request acknowledgement (HARQ ACK) message by the terminal equipment.

In yet another possible implementation, the processing unit 1102 is further configured to, when the first timer expires, not trigger the first BSR if a logical channel of the apparatus includes uplink data and the first condition is not satisfied.

In yet another possible implementation, the first BSR includes a regular BSR.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 5.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is configured to, when the first timer expires, not trigger the first BSR if the logical channel of the apparatus includes uplink data and a first condition is not satisfied, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is configured to trigger a regular buffer status report, regular BSR, when the first timer expires and a logical channel of the device includes uplink data; the processing unit 1102 is configured to, when the regular BSR is triggered, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT; triggering a scheduling request SR.

In a possible implementation manner, the processing unit 1102 is further configured to trigger random access when the SR is triggered and there is no physical uplink control channel PUCCH resource for the SR.

In yet another possible implementation manner, the regular BSR is not triggered in an inactive state or is not triggered during a small data transfer SDT, including: the regular BSR is not triggered at an initial stage in the SDT procedure, or the regular BSR is triggered after contention resolution is successful in the SDT procedure, or the regular BSR is triggered when contention resolution is successfully completed in the SDT procedure, or the regular BSR is triggered after random access-based SDT is successfully completed, or the regular BSR is triggered after the first message transmission is successfully completed, or the first message transmission is successfully completed when the regular BSR is triggered, or the regular BSR is triggered in case the apparatus and the network device establish a connection, or the regular BSR is triggered after the apparatus receives an acknowledgement message for the first message from the network device; or the regular BSR is triggered by the apparatus upon receiving a response message from the network device for the first message, or the regular BSR is triggered after the apparatus receives a physical downlink control channel PDCCH transmission message scrambled by a cell radio network temporary identity C-RNTI, or the regular BSR is triggered after the apparatus receives a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identity CS-RNTI, or the regular BSR is triggered after the apparatus receives a radio resource control RRC message.

In yet another possible implementation manner, the processing unit 1102 is configured to trigger when the regular BSR is triggered, and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered in an SDT procedure; triggering the SR.

In yet another possible implementation manner, the processing unit 1102 is further configured to trigger when the regular BSR is triggered, and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is triggered in an inactive state or triggered in an SDT procedure; the SR is not triggered.

In yet another possible implementation, the regular BSR is triggered in an inactive state or triggered in an SDT procedure, including: the regular BSR is triggered at an initial stage in the SDT procedure, or the regular BSR is not triggered after contention resolution is successful in the SDT procedure, or the regular BSR is not triggered when contention resolution is successfully completed in the SDT procedure, or the regular BSR is not triggered after random access-based SDT is successfully completed, or the regular BSR is not triggered after successful completion of the first message transmission, or the first message transmission is not successfully completed when the regular BSR is triggered, or the regular BSR is not triggered in case the apparatus and the network device establish a connection, or the regular BSR is not triggered after the apparatus receives an acknowledgement message for the first message from the network device; or the regular BSR is not triggered by the apparatus upon receiving a response message from the network device for the first message, or the regular BSR is not triggered after the apparatus receives a PDCCH transmission message scrambled by a C-RNTI, or the regular BSR is not triggered after the apparatus receives a PDCCH transmission message scrambled by a CS-RNTI, or the regular BSR is not triggered after the apparatus receives an RRC message.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 6.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101, and start a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit 1102 is configured to trigger a regular buffer status report, regular BSR, when the first timer expires and a logical channel of the device includes uplink data; the processing unit 1102 is configured to not trigger a scheduling request SR when the regular BSR is triggered, there is no available uplink resource, and the regular BSR is triggered in an inactive state or triggered during a small data transmission SDT.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to trigger a scheduling request SR when a regular buffer status report, regular BSR, is triggered, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT.

In a possible implementation manner, the processing unit 1102 is further configured to send a first message through the communication unit 1101, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is further configured to trigger a regular buffer status report, regular BSR, when the first timer expires and a logical channel of the device includes uplink data; or when there is new uplink data on the first logical channel, where the first logical channel priority is higher than the priority of any one logical channel in any one logical channel group including the available uplink data, triggering a regular buffer status report, or BSR, where the first logical channel is any one of the logical channels of the apparatus or any one of the logical channels associated with the SDT.

In one possible implementation, the logical channel is a logical channel associated with an SDT.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to trigger a random access procedure when the scheduling request SR is triggered, the logical channel of the terminal device has uplink data, no resource is used for SR, and a second condition is satisfied; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

In a possible implementation manner, the processing unit 1102 is configured to send a first message, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is configured to trigger a regular buffer status report, regular BSR, when the first timer expires and a logical channel of the device includes uplink data; the processing unit 1102 is configured to trigger a scheduling request SR when the regular BSR is triggered and there is no available uplink transmission resource.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 7.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to, when the scheduling request SR is triggered, not trigger a random access procedure if the logical channel of the terminal device has uplink data, no resource for SR, and the second condition is not satisfied; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The communication unit 1101 is configured to send a first message, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is configured to start a first timer if the first message meets at least one of the following; the at least one item includes: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent to the network device in the process of Small Data Transfer (SDT); the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed.

In one possible implementation, the first message transmission is successfully completed, including at least one of: the contention resolution message is received, the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI is received, the PDCCH transmission message scrambled by the configuration scheduling radio network temporary identifier CS-RNTI is received, or the radio resource control RRC message is received.

In a further possible implementation manner, the processing unit 1102 is configured to not start the first timer if the first message meets at least one of the following; the at least one item includes: the first message is carried in a CCCH message; the first message is a first message or a second message sent by the device to the network equipment in the SDT process; the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is not completed successfully.

In yet another possible implementation manner, the first message is not successfully completed, including at least one of the following: the contention resolution message is not received, the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI is not received, the PDCCH transmission message scrambled by the configuration scheduling radio network temporary identifier CS-RNTI is not received, or the radio resource control RRC message is not received.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 8.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101, and start a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processing unit 1102 is configured to not trigger or ignore or discard the first random access if the first message transmission is unsuccessful and the first timer expires.

In a possible implementation, the communication unit 1101 is configured to not receive the second message before the second timer expires; or, receiving a second message before a second timer expires, but the first identity in the second message does not match the second identity in the first message; or, receiving a second message before the second timer expires, the second message indicating a negative acknowledgement, NACK; wherein the second message is a response message to the first message.

In yet another possible implementation, the second timer times out; or, the communication unit 1101 is configured to receive a second message when a second timer runs, where a first identifier in the second message does not match a second identifier in the first message; or, the communication unit is configured to receive a second message when the second timer is running, where the second message indicates a negative acknowledgement NACK.

In yet another possible implementation manner, the processing unit 1102 is configured to not trigger or ignore or discard the first random access if the apparatus does not have a physical uplink control channel PUCCH resource for the scheduling request SR.

In yet another possible implementation, the first message satisfies at least one of: the first message is carried in a Common Control Channel (CCCH) message; the first message is a first message or a second message sent by the device to the network equipment in the SDT process of small data transmission; or the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 9.

Alternatively, a detailed description of the respective units in the communication apparatus 1100 may be as follows. The processing unit 1102 is configured to send a third message through the communication unit 1101, where the third message is a retransmission message of the first message, and a redundancy version RV used by the third message is the same as an RV version of the first message.

It should be noted that the implementation and beneficial effects of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 10.

Referring to fig. 12, fig. 12 shows a communication device 1200 according to an embodiment of the present application, where the communication device 1200 includes at least one processor 1201 and a communication interface 1203, and optionally, a memory 1202, and the processor 1201, the memory 1202 and the communication interface 1203 are connected to each other through a bus 1204.

Memory 1202 includes, but is not limited to, random access memory (random access memory, RAM), read-only memory (ROM), erasable programmable read-only memory (erasable programmable read only memory, EPROM), or portable read-only memory (compact disc read-only memory, CD-ROM), with memory 1202 for associated computer programs and data. The communication interface 1203 is used to receive and transmit data.

The processor 1201 may be one or more central processing units (central processing unit, CPU), and in the case where the processor 1201 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: sending a first message through the communication interface 1203, starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processor 1201 is configured to stop the first timer if the first message transmission is unsuccessful.

In yet another possible implementation, the processor 1201 is configured to not receive a second message through the communication interface 1203 before the second timer expires; or, receiving a second message before a second timer expires, but the first identity in the second message does not match the second identity in the first message; or, receiving a second message before the second timer expires, the second message indicating a negative acknowledgement, NACK; wherein the second message is a response message to the first message.

In yet another possible implementation, the second timer times out, or the processor 1201 is configured to receive, through the communication interface 1203, a second message when the second timer is running, where a first identifier in the second message does not match a second identifier in the first message; alternatively, in case the second timer is running, a second message is received, said second message indicating a negative acknowledgement, NACK.

In yet another possible implementation, the processor 1201 is configured to not receive a second message through the communication interface 1203 if the second timer expires.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 4.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: transmitting a first message through the communication interface 1203, starting a first timer, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processor 1201 is configured to trigger a first BSR when the first timer expires, where a logical channel of the apparatus includes uplink data, and a first condition is satisfied, the first condition including: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

In one possible implementation, the first message transmission success includes at least one of: and receiving a contention resolution message, receiving a Physical Downlink Control Channel (PDCCH) transmission message scrambled by a cell radio network temporary identifier (C-RNTI), receiving a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identifier (CS-RNTI), or receiving a Radio Resource Control (RRC) message, wherein the terminal equipment receives an automatic retransmission request acknowledgement (ARQ ACK) message or the terminal equipment receives a hybrid automatic retransmission request acknowledgement (HARQ ACK) message.

In yet another possible implementation, the processor 1201 is further configured to, when the first timer expires, not trigger the first BSR if a logical channel of the apparatus includes uplink data and the first condition is not satisfied.

In yet another possible implementation, the first BSR includes a regular BSR.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 5.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: transmitting a first message through the communication interface 1203, starting a first timer, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); when the first timer times out, the logical channel of the device includes uplink data, and the first BSR is not triggered if a first condition is not satisfied, the first condition including: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: transmitting a first message through the communication interface 1203, starting a first timer, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); the processor 1201 is configured to trigger a regular buffer status report, regular BSR, when the first timer expires and the logical channel of the apparatus includes uplink data; the processor 1201 is configured to, when the regular BSR is triggered, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT; triggering a scheduling request SR.

In a possible implementation manner, the processor 1201 is further configured to trigger random access in a case where the SR is triggered and there is no physical uplink control channel PUCCH resource for the SR.

In yet another possible implementation, the processor 1201 is configured to trigger when the regular BSR is triggered and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or triggered in an SDT procedure; triggering the SR.

In yet another possible implementation manner, the processor 1201 is further configured to trigger when the regular BSR is triggered, and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is triggered in an inactive state or triggered in an SDT procedure; the SR is not triggered.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 6.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: sending a first message through the communication interface 1203, starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); triggering a regular Buffer Status Report (BSR) if the first timer times out and a logical channel of the device includes uplink data; in case the regular BSR is triggered, there are no available uplink transmission resources, and the regular BSR is triggered in an inactive state or triggered during a small data transmission SDT, the scheduling request SR is not triggered.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: in case the regular buffer status report regular BSR is triggered, there are no available uplink transmission resources, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT, the scheduling request SR is triggered.

In a possible implementation manner, the processor 1201 is further configured to send a first message through the communication interface 1203, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; the processor 1201 is further configured to trigger a regular buffer status report (regular BSR) when the first timer expires and a logical channel of the apparatus includes uplink data; or when there is new uplink data on the first logical channel, where the first logical channel priority is higher than the priority of any one logical channel in any one logical channel group including the available uplink data, triggering a regular buffer status report, or BSR, where the first logical channel is any one of the logical channels of the apparatus or any one of the logical channels associated with the SDT.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: triggering a random access process when a Scheduling Request (SR) is triggered, a logic channel of the device has uplink data, resources for the SR are not used, and a second condition is met; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

In a possible implementation, the processor 1201 is configured to send a first message through the communication interface 1203, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE; triggering a regular Buffer Status Report (BSR) if the first timer times out and a logical channel of the device includes uplink data; and triggering a Scheduling Request (SR) under the condition that the regular BSR is triggered and no uplink transmission resource is available.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 7.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: when a Scheduling Request (SR) is triggered, a logic channel of the device has uplink data, resources for the SR are not used, and a random access process is not triggered under the condition that a second condition is not met; the second condition includes one or more of: a contention resolution message is received, a response message or an acknowledgement message for a first message is received from a network device, or the first message is transmitted successfully.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: transmitting a first message through the communication interface 1203, the first message comprising a buffer status report BSR medium access control MAC control element CE; the processor 1201 is configured to start a first timer if the first message meets at least one of the following; the at least one item includes: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent to the network device in the process of Small Data Transfer (SDT); the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed.

In yet another possible implementation, the processor 1201 is configured to not start a first timer if the first message meets at least one of the following; the at least one item includes: the first message is carried in a CCCH message; the first message is a first message or a second message sent by the device to the network equipment in the SDT process; the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is not completed successfully.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 8.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: sending a first message through the communication interface 1203, starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE); in case the first message transmission is unsuccessful, the first timer times out, the first random access is not triggered or ignored or abandoned.

In one possible implementation, the processor 1201 is configured to not receive the second message before the second timer expires; or, receiving a second message before a second timer expires, but the first identity in the second message does not match the second identity in the first message; or, receiving a second message before the second timer expires, the second message indicating a negative acknowledgement, NACK; wherein the second message is a response message to the first message.

In yet another possible implementation, the second timer times out; or, the processor 1201 is configured to receive a second message when a second timer runs, where a first identifier in the second message does not match a second identifier in the first message; or, the communication unit is configured to receive a second message when the second timer is running, where the second message indicates a negative acknowledgement NACK.

In yet another possible implementation, the processor 1201 is configured to not receive the second message if the second timer expires.

In yet another possible implementation manner, the processor 1201 is configured to not trigger or ignore or discard the first random access if the apparatus does not have a physical uplink control channel PUCCH resource for the scheduling request SR.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 9.

The processor 1201 in the communication apparatus 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: and sending a third message through the communication interface 1203, wherein the third message is a retransmission message of the first message, and the redundancy version RV used by the third message is the same as the RV version of the first message.

It should be noted that the implementation and beneficial effects of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 10.

It is to be appreciated that the processor in embodiments of the application may be a CPU, but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSPs), application specific integrated circuits (Application Specific Integrated Circuit, ASICs), field programmable gate arrays (Field Programmable Gate Array, FPGAs) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by executing software instructions by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory, flash memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a base station or terminal. The processor and the storage medium may reside as discrete components in a base station or terminal.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as digital video discs; but also semiconductor media such as solid state disks. The computer readable storage medium may be volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage medium.

In various embodiments of the application, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.

Claims

1. A method of communication, comprising:

the terminal equipment sends a first message and starts a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE);

and if the first message transmission is unsuccessful, stopping the first timer by the terminal equipment.

2. The method of claim 1, wherein the first message transmission is unsuccessful, comprising:

the second timer times out; or alternatively, the process may be performed,

a second timer is running, the terminal equipment receives a second message, and a first identifier in the second message is not matched with a second identifier in the first message; or alternatively, the process may be performed,

a second timer is running and the terminal device receives a second message indicating a negative acknowledgement, NACK.

3. The method of claim 2, wherein the second message comprises at least one of: the contention resolution message is a Physical Downlink Control Channel (PDCCH) transmission message scrambled by a cell radio network temporary identity (C-RNTI), a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identity (CS-RNTI), or a Radio Resource Control (RRC) message.

4. A method according to claim 2 or 3, characterized in that,

the first Timer comprises a retransmission buffer status report Timer retxBSR-Timer, and the second Timer comprises a contention resolution Timer or a PDCCH listening Timer.

5. The method of any of claims 1-4, wherein the first message satisfies at least one of:

the first message is carried in a Common Control Channel (CCCH) message; the first message is a first message or a second message sent by the terminal equipment to the network equipment in the SDT process of small data transmission; or the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message.

6. The method according to any one of claims 1 to 5, wherein,

the terminal device is in an RRC inactive state or an RRC idle state.

7. A method of communication, comprising:

the method comprises the steps that a terminal device sends a first message, and a first timer is started, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE);

if the first timer times out, the logical channel of the terminal device includes uplink data, and a first condition is satisfied, the terminal device triggers a first BSR, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

8. The method of claim 7, wherein the first message transmission success comprises at least one of:

the terminal equipment receives the contention resolution message, the terminal equipment receives the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI, the terminal equipment receives the PDCCH transmission message scrambled by the configuration scheduling radio network temporary identifier CS-RNTI, or the terminal equipment receives the radio resource control RRC message.

9. The method according to claim 7 or 8, wherein the first message satisfies at least one of:

10. The method according to any one of claims 7 to 9, wherein,

the logical channel corresponds to an SDT radio bearer RB.

11. The method according to any of claims 7-10, wherein the first Timer comprises a retransmission buffer status report Timer retxbr-Timer.

12. The method of any of claims 7-11, wherein the first BSR comprises a regular BSR.

13. The method according to any one of claims 7 to 12, wherein,

the terminal device is in an RRC inactive state or an RRC idle state.

14. A method of communication, comprising:

if the first timer is overtime and the logic channel of the terminal equipment contains uplink data, the terminal equipment triggers a regular Buffer Status Report (BSR);

if the regular BSR is triggered, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT, the terminal device triggers a scheduling request SR.

15. The method of claim 14, wherein the method further comprises:

and if the terminal equipment triggers the SR and the Physical Uplink Control Channel (PUCCH) resource for the SR does not exist, the terminal equipment triggers random access.

16. The method according to claim 14 or 15, wherein if the regular BSR is triggered, there are no available uplink transmission resources, and the regular BSR is not triggered in an inactive state or triggered during a small data transmission, SDT; the triggering of the scheduling request SR by the terminal device includes:

if the regular BSR is triggered and a timer of a delay SR is not running, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or is not triggered in an SDT procedure; the terminal device triggers an SR.

17. The method according to any one of claims 14-16, further comprising:

if the regular BSR is triggered and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is triggered in an inactive state or triggered in an SDT procedure; the terminal device does not trigger an SR.

18. The method according to any one of claims 14 to 17, wherein,

the terminal device is in an RRC inactive state or an RRC idle state.

19. A method of communication, comprising:

The method comprises the steps that a terminal device sends a first message, wherein the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE);

if the first message meets at least one of the following items, the terminal equipment starts a first timer; the at least one item includes: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent by the terminal equipment to the network equipment in the SDT process of small data transmission; the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed.

20. The method of claim 19, wherein the first message comprises a buffer status report, BSR, medium access control, MAC, control element, CE, comprising:

the BSR corresponding to the BSR MAC CE is triggered and not cancelled; the first message includes the BSR MAC CE if uplink shared channel resources for a new transmission are available and the size of the uplink shared channel resources may include the BSR MAC CE plus the size of its sub-header.

21. The method according to claim 19 or 20, wherein the first Timer comprises a retransmission buffer status report Timer retbsr-Timer.

22. The method according to any one of claims 19 to 21, wherein,

the terminal device is in an RRC inactive state or an RRC idle state.

23. A communication device is characterized by comprising a communication unit and a processing unit,

the processing unit is used for sending a first message through the communication unit and starting a first timer; the first message comprises a Buffer Status Report (BSR) Media Access Control (MAC) Control Element (CE);

the processing unit is configured to stop the first timer when the first message transmission is unsuccessful.

24. The apparatus of claim 23, wherein the device comprises a plurality of sensors,

the second timer times out; or alternatively, the process may be performed,

the communication unit is used for receiving a second message under the condition that a second timer is running, and a first identifier in the second message is not matched with a second identifier in the first message; or alternatively, the process may be performed,

the communication unit is configured to receive a second message, where the second timer is running, the second message indicating a negative acknowledgement NACK.

25. The apparatus of claim 23, wherein the second message comprises at least one of: the contention resolution message is a Physical Downlink Control Channel (PDCCH) transmission message scrambled by a cell radio network temporary identity (C-RNTI), a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identity (CS-RNTI), or a Radio Resource Control (RRC) message.

26. The apparatus of claim 24 or 25, wherein the device comprises a plurality of sensors,

27. The apparatus according to any of claims 23-26, wherein the first message satisfies at least one of:

the first message is carried in a Common Control Channel (CCCH) message; the first message is a first message or a second message sent to the network equipment in the SDT process of small data transmission; or the first message is a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message.

28. The apparatus according to any of claims 23-27, wherein the apparatus is in an RRC inactive state or an RRC idle state.

29. A communication device, comprising: a communication unit and a processing unit,

the processing unit is configured to send a first message through the communication unit, and start a first timer, where the first message includes a buffer status report BSR medium access control MAC control element CE;

the processing unit is configured to trigger a first BSR when the first timer expires, where a logical channel of the apparatus includes uplink data, and a first condition is satisfied, where the first condition includes: the first timer times out until the first message transmission is successful, or the first message transmission is successful until the first timer times out.

30. The apparatus of claim 29, wherein the first message transmission success comprises at least one of:

and receiving a contention resolution message, receiving a Physical Downlink Control Channel (PDCCH) transmission message scrambled by a cell radio network temporary identifier (C-RNTI), receiving a PDCCH transmission message scrambled by a configuration scheduling radio network temporary identifier (CS-RNTI), and receiving a Radio Resource Control (RRC) message.

31. The apparatus of claim 29 or 30, wherein the first message satisfies at least one of:

32. The device according to any one of claims 29-31, wherein,

the logical channel corresponds to an SDT radio bearer RB.

33. The apparatus of any of claims 29-32, wherein the first Timer comprises a retransmission buffer status report Timer retxbr-Timer.

34. The apparatus of any of claims 29-33, wherein the first BSR comprises a regular BSR.

35. The apparatus of any one of claims 29-34, wherein,

the device is in an RRC inactive state or an RRC idle state.

36. A communication device, comprising: a communication unit and a processing unit,

The processing unit is configured to trigger a regular buffer status report (regular BSR) when the first timer expires and a logical channel of the apparatus includes uplink data;

the processing unit is configured to, when the regular BSR is triggered, have no available uplink transmission resources, and the regular BSR is not triggered in an inactive state or is not triggered during a small data transmission SDT; triggering a scheduling request SR.

37. The apparatus of claim 36, wherein the device comprises a plurality of sensors,

the processing unit is further configured to trigger random access when the SR is triggered and there is no physical uplink control channel PUCCH resource for the SR.

38. The apparatus of claim 36 or 37, wherein the device comprises a plurality of sensors,

the processing unit is configured to trigger when the regular BSR is not running and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is not triggered in an inactive state or triggered in an SDT procedure; triggering the SR.

39. The apparatus of any one of claims 36-38, wherein,

the processing unit is further configured to, when the regular BSR is triggered, and a timer for delaying SR is not running, there is no available uplink transmission resource, and the regular BSR is triggered in an inactive state or triggered in an SDT procedure; the SR is not triggered.

40. The apparatus of any one of claims 36-39, wherein,

the device is in an RRC inactive state or an RRC idle state.

41. A communication device, comprising: a communication unit and a processing unit,

the communication unit is configured to send a first message, where the first message includes a buffer status report BSR medium access control MAC control element CE;

the processing unit is used for starting a first timer in the case that the first message meets at least one of the following items; the at least one item includes: the first message is not carried in a common control channel CCCH message; the first message is not a first message or a second message sent to the network device in the process of Small Data Transfer (SDT); the first message is not a first message transmitted on a Physical Uplink Shared Channel (PUSCH) in the SDT process, and the message transmitted on the PUSCH comprises a CCCH message; or the first message transmission is successfully completed.

42. The apparatus of claim 41, wherein the device comprises,

43. The apparatus of claim 41 or 42, wherein the first Timer comprises a retransmission buffer status report Timer retbsr-Timer.

44. The device of any one of claims 41-43, wherein,

the device is in an RRC inactive state or an RRC idle state.

45. A communication device, comprising:

a memory for storing instructions;

a processor for invoking and executing the instructions from the memory to cause the communication device to perform the method of any of claims 1-22.

46. A computer readable storage medium having instructions stored therein which, when run on a processor, implement the method of any of claims 1-22.