WO2023151482A1

WO2023151482A1 - Communication method and apparatus

Info

Publication number: WO2023151482A1
Application number: PCT/CN2023/073951
Authority: WO
Inventors: 毛颖超; 常俊仁; 酉春华; 唐骥
Original assignee: 华为技术有限公司
Priority date: 2022-02-11
Filing date: 2023-01-31
Publication date: 2023-08-17
Also published as: CN116634488A

Abstract

Provided in the embodiments of the present application are a communication method and apparatus. The method comprises: a terminal device sending a first message, and starting a first timer, wherein the first message comprises a buffer status report (BSR) media access control (MAC) control element (CE); and if the first message is not successfully transmitted, the terminal device stopping the first timer. Therefore, situations in which another random access process is introduced when an SDT process is in progress can be reduced, thereby reducing access anomalies of the terminal device, and a network device identifies and processes the access anomalies of the terminal device, thereby improving the access success rate of SDT.

Description

Communication method and device

This application claims the priority of the Chinese patent application with the application number 202210130567.5 and the invention title "communication method and device" filed with the State Intellectual Property Office of China on February 11, 2022, the entire contents of which are incorporated herein by reference.

technical field

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

Background technique

Non-activated terminal devices support small data transmission (SDT), specifically, small data transmission based on random access (RA), that is, RA-SDT and configuration-based authorization (CG, configured Grant) SDT transmission of type 1 (type1) resources, that is, CG-SDT.

In the RA-SDT process or CG-SDT process, the terminal device sends the second message or the first message to the network device. After the first message can also be called the initial uplink message, it will start the contention resolution timer or physical Downlink control channel (physical downlink control channel, PDCCH) monitoring timer, when the second message or the first message includes buffer status report (buffer status report, BSR) information, for example, BSR media access layer (media access control, MAC) control element (control element, CE), the terminal device starts the retransmission buffer status report timer (retxBSR-Timer), optional, the duration of retxBSR-Timer is longer than the contention resolution timer or PDCCH monitoring timer Duration, when the contention resolution fails, or when the PDCCH monitoring timer times out or does not receive a response message from the network device, that is, the initial uplink message transmission fails, the retxBSR-Timer continues to run until it times out. When the retxBSR-Timer times out, due to logic The channel contains data to be transmitted, and the terminal device will trigger a regular (regular) BSR. Since there is no uplink resource for sending a regular BSR, the terminal device triggers a scheduling request (SR), but in RA-SDT or CG-SDT During the process, the network device will not configure SR resources for the terminal device, and the terminal device will trigger a random access process to obtain resources because there is no physical uplink control channel (PUCCH) resource for SR. However, at this time, the terminal device re-performs the random access process of RA-SDT when the contention resolution fails or re-performs the initial uplink message transmission (ie retransmission) of CG-SDT when the initial uplink message transmission fails. The terminal device has not established a connection with the network device, and the PUCCH resource that is not used for SR is introduced during RA-SDT to trigger the random access process, or the terminal device selects the PUCCH resource that is not used for SR to trigger the random access process. During the RA-SDT process or CG-SDT process, that is, the connection between the terminal device and the network device is not established, a network exception will occur, resulting in RA-SDT or CG-SDT failure.

Contents of the invention

The embodiment of the present application discloses a communication method and device, so as to improve the success rate of SDT access.

The first aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a first message and starts a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; if The transmission of the first message is unsuccessful, and the terminal device stops the first timer.

In the above method, the way of stopping the first timer through the unsuccessful transmission of the first message can reduce the triggering of the regular BSR due to the timeout of the first timer, and further reduce the triggering of the scheduling request SR due to lack of authorization, thereby reducing the In this way, the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving the SDT access success rate.

In a possible implementation manner, the first timer includes a retransmission buffer status report timer retxBSR-Timer.

In a possible implementation manner, the unsuccessful transmission of the first message includes: not receiving the second message before the second timer expires; or receiving the second message but receiving the second message before the second timer expires. The first identifier in the second message does not match the second identifier in the first message; or, the second message is received before the second timer expires, and the second message indicates a negative acknowledgment NACK; wherein, The second message is a response message to the first message.

In yet another possible implementation manner, the unsuccessful transmission of the first message includes: the second timer expires; or, if the second timer is running, the terminal device receives the second message, and the second The first identifier in the message does not match the second identifier in the first message; or, if the second timer is running, the terminal device receives a second message indicating a negative acknowledgment NACK.

In yet another possible implementation manner, the second message is a response message to the first message. For example, in the RA-SDT process, the second message is a contention resolution message; in the CG-SDT process, the second message is a response message or a confirmation message.

In yet another possible implementation manner, the timeout of the second timer 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 following: a contention resolution message, a Physical Downlink Control Channel (PDCCH) transmission message scrambled by the cell wireless network temporary identifier C-RNTI, and a configuration scheduling wireless network A PDCCH transmission message scrambled by a temporary identifier CS-RNTI, or a radio resource control RRC message.

In yet another possible implementation manner, the first timer includes a retransmission buffer status report timer retxBSR-Timer, and the second timer includes a contention resolution timer or a PDCCH monitoring timer.

In another possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; the first message is the terminal during the small data transmission SDT process The first message or the second message sent by the device to the network device; or the first message is the first message transmitted on the physical uplink shared channel PUSCH during the SDT process, and the message transmitted on the PUSCH includes CCCH information.

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; if used The newly transmitted uplink shared channel resource is available and the size of the uplink shared channel resource may include the size of the BSR MAC CE plus its subheader, and the first message includes the BSR MAC CE.

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

In yet another possible implementation manner, the terminal device is in a small data transmission process or an early data transmission process.

The second aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a first message and starts a first timer, the first message includes a buffer status report BSR medium access control MAC control element CE; if The first timer expires, the logical channel of the terminal device contains uplink data, and a first condition is met, the terminal device triggers the first BSR, and the first condition includes: the first timer expires until the The transmission of the first message is successful, or the transmission of the first message is successful until the first timer expires.

In the above method, by triggering the first BSR when the first timer expires, the logical channel contains uplink data, and the first condition is met, it can reduce the number of triggering the first BSR when the connection between the terminal device and the network device is not established. The occurrence of a BSR further reduces the situation of triggering a scheduling request SR due to lack of authorization and triggering random access due to lack of SR resources. In this way, the terminal device continues to perform the current SDT process, thereby reducing the access exception of the terminal device, and The network equipment identifies and handles the abnormal situation of terminal equipment access, thereby improving the success rate of SDT access.

In a possible implementation manner, the successful transmission of the first message includes at least one of the following: the terminal device receives a contention resolution message, and the terminal device receives a message scrambled by a cell radio network temporary identifier C-RNTI The physical downlink control channel PDCCH transmission message, the terminal device receives the PDCCH transmission message scrambled by the configured scheduling radio network temporary identifier CS-RNTI, the terminal device receives the radio resource control RRC message, and the terminal device receives The automatic repeat request confirms the ARQ ACK message, or the terminal device receives the hybrid automatic repeat request confirms the HARQ ACK message.

In yet another possible implementation manner, the method further includes: if the first timer expires, the logical channel of the terminal device contains uplink data, and the first condition is not met, the terminal device does not triggering the first BSR.

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

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

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

The third aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a first message and starts a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; if The first timer expires, the logical channel of the terminal device contains uplink data, and the first condition is not met, the terminal device does not trigger the first BSR, and the first condition includes: the first timing The timer times out until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer times out.

In the above method, by not triggering the first BSR when the first timer expires, the logical channel contains uplink data, and the first condition is not met, it can reduce the number of cases where the connection between the terminal device and the network device is not established. triggering the first BSR, thereby reducing the situation of triggering a scheduling request SR due to lack of authorization, and triggering random access due to lack of SR resources, so that the terminal device continues the current SDT process, thereby reducing the access exception of the terminal device, and The network equipment identifies and handles the abnormal situation of terminal equipment access, thereby improving the success rate of SDT access.

The fourth aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a first message and starts a first timer, the first message includes a buffer status report BSR medium access control MAC control element CE; if The first timer expires, and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report regular BSR; if the regular BSR is triggered, there are no available uplink transmission resources, and The regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process, and the terminal device triggers a scheduling request SR.

In the above method, when the regular BSR is triggered, there are no available uplink transmission resources, and the regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process, the terminal device triggers tone The method of requesting SR can reduce the triggering of the first BSR when the connection between the terminal device and the network device is not established, thereby reducing the triggering of the scheduling request SR due to lack of authorized resources, thereby reducing the triggering of random access due to the absence of SR resources In this way, the terminal device continues to perform the SDT process, thereby reducing the access abnormality of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving the SDT access success rate.

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

In yet another possible implementation manner, the regular BSR is not triggered in the inactive state or is not triggered in the small data transmission process SDT, including: the regular BSR is not triggered in the initial stage of the SDT process Triggered, or the regular BSR is triggered after the contention is successfully resolved during the SDT process, or the regular BSR is triggered when the contention resolution is successfully completed during the SDT process, or the regular BSR is triggered based on random access It is triggered after the incoming 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 The BSR is triggered when the terminal device establishes a connection with the network device, or the regular BSR is triggered after the terminal device receives an acknowledgment message from the network device for the first message Triggered; or 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 when the terminal device receives a response message from the network device It is triggered after the physical downlink control channel PDCCH transmission message scrambled by the radio network temporary identifier C-RNTI of the cell, or the regular BSR is triggered when the terminal device receives the PDCCH scrambled by the configured scheduling radio network temporary identifier CS-RNTI It is triggered after a message is transmitted, 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 are no available uplink transmission resources, and the regular BSR is not triggered in the inactive state or not during the small data transmission SDT process Triggered; the terminal device triggers a scheduling request SR, including: if the regular BSR is triggered, and the delay SR timer is not running, there are no available uplink transmission resources, and the regular BSR is not in an inactive state Triggered or not during SDT, the terminal device triggers SR.

In yet another possible implementation manner, the no available uplink transmission resource includes: no available uplink new transmission resource.

In yet another possible implementation, the method further includes: if the regular BSR is triggered, and the timer for delaying the SR is not running, there are no available uplink transmission resources, and the regular BSR is inactive The state is triggered or is triggered during the SDT process; the terminal device does not trigger the SR.

In yet another possible implementation manner, the regular BSR is triggered in an inactive state or is triggered during the SDT process, including: the regular BSR is triggered at the initial stage of the SDT process, Or the regular BSR is not triggered after the contention resolution is successful during the SDT process, or the regular BSR is not triggered when the contention resolution is successfully completed during the SDT process, or the regular BSR is not triggered during the SDT based on random access is triggered after successful completion, or the regular BSR is not triggered after the first message transmission is successfully completed, or the first message transmission is not successfully completed when the regular BSR is triggered, or the regular BSR It is not triggered when the connection between the terminal device and the network device is established, or the regular BSR is not triggered after the terminal device receives an acknowledgment message from the network device for the first message or the regular BSR is not triggered when the terminal device receives a response message from the network device for the first message, or the regular BSR is not triggered when the terminal device receives - Triggered after the PDCCH transmission message scrambled by the RNTI, or the regular BSR is not triggered after the terminal equipment receives the PDCCH transmission message scrambled by the CS-RNTI, or the regular BSR is not triggered after the It is triggered after the terminal device receives the RRC message.

The fifth aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a first message and starts a first timer, the first message includes a buffer status report BSR medium access control MAC control element CE; if The first timer expires, and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report regular BSR; if the regular BSR is triggered, there are no available uplink transmission resources, and The regular BSR is triggered in an inactive state or during a small data SDT process, and the terminal device does not trigger a scheduling request SR.

In the above method, when the regular BSR is triggered, there are no available uplink transmission resources, and the regular BSR is triggered in the inactive state or is triggered during the SDT process, the terminal device does not trigger the scheduling request The SR method can reduce the triggering of the first BSR when the connection between the terminal device and the network device is not established, thereby reducing the triggering of the scheduling request SR due to lack of authorized resources, thereby reducing the triggering of random access due to the lack of SR resources, so , the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving the success rate of SDT access.

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

In a possible implementation manner, the method further includes: the terminal device sends a first message and starts a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; If the first timer expires and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report regular BSR; or, if there is new uplink data on the first logical channel, the The priority of the first logical channel is higher than the priority of any logical channel containing available uplink data in any 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 a possible implementation manner, the logical channel is a channel associated with the SDT.

In the above method, through the above method, it is possible to reduce the triggering of the first BSR when the connection is not established between the terminal device and the network device, thereby reducing the triggering of the scheduling request SR due to lack of authorized resources, thereby reducing the triggering of random access due to the lack of SR resources. In this way, the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving the success rate of SDT access.

The seventh aspect of the embodiment of the present application discloses a communication method, including: if the scheduling request SR is triggered, the logical channel of the terminal device has uplink data, there is no resource for SR, and the second condition is met, the terminal device triggers Random access procedure; the second condition includes one or more of the following: receiving a contention resolution message, receiving a response message or confirmation message from the network device for the first message, or the first message is successfully transmitted.

In the above method, if the SR is triggered, the logical channel of the terminal device has uplink data, and there are no available uplink transmission resources, the second condition is met, and the random access process is triggered, which can reduce the time between the terminal device and the network device. The first BSR is triggered when the connection is not established, thereby reducing the triggering of the scheduling request SR due to lack of authorized resources, thereby reducing the triggering of random access due to the lack of SR resources, so that the terminal device can continue the current SDT process, thereby It reduces the access abnormality of terminal equipment, and the identification and processing of abnormal terminal equipment access by network equipment, thereby improving the success rate of SDT access.

In a possible implementation manner, the method further includes: the terminal device sends a first message and starts a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; If the first timer expires and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report regular BSR; if the regular BSR is triggered, there are no available uplink transmission resources, The terminal device triggers a scheduling request SR.

The eighth aspect of the embodiment of the present application discloses a communication method, including: if the scheduling request SR is triggered, the logical channel of the terminal device has uplink data, there is no resource for SR, and the second condition is not satisfied, the terminal device The random access process is not triggered; the second condition includes one or more of the following: receiving a contention resolution message, receiving a response message or confirmation message from the network device for the first message, or the transmission of the first message success.

In the above method, if the SR is triggered, the logical channel of the terminal device has uplink data, there is no available uplink transmission resource, the second condition is not met, and the random access process is not triggered, the number of connections between the terminal device and the network device can be reduced. The first BSR is triggered when the connection is not established, thereby reducing the triggering of the scheduling request SR due to lack of authorized resources, thereby reducing the triggering of random access due to the absence of SR resources, so that the terminal device can continue the current SDT process, Thereby, the access abnormality of the terminal equipment is reduced, and the identification and processing of the abnormal access situation of the terminal equipment by the network equipment are reduced, thereby improving the access success rate of the SDT.

In a possible implementation manner, the method further includes: the terminal device sends a first message and starts a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; If the first timer expires and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report regular BSR; if the regular BSR is triggered, there are no available uplink transmission resources, The terminal device triggers an SR.

The ninth aspect of the embodiment of the present application discloses a communication method, including: a terminal device sends a first message, the first message includes a buffer status report BSR medium access control MAC control element CE; if the first message satisfies At least one of the following items, the terminal device starts the first timer; the at least one item includes: the first message is not carried in the common control channel CCCH message; the first message is not carried in the small data transmission SDT process The first message or the second message sent by the terminal device to the network device; the first message is not the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes CCCH message; or the transmission of the first message is successfully completed.

In the above method, the first timer is started by the first message satisfying at least one of the following items, the at least one item includes: the first message is not carried in the common control channel CCCH message; the first message It is not the first message or the second message sent by the terminal device to the network device during the small data transmission SDT process; the first message is not the first message transmitted on the physical uplink shared channel PUSCH during the SDT process, The message transmitted on PUSCH The message includes a CCCH message; or the transmission of the first message is successfully completed; it can reduce the triggering of the first BSR when the terminal device and the network device are not connected, thereby reducing the triggering of the scheduling request SR due to no authorized resources, thereby reducing the In this case, the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving the SDT access success rate.

In a possible implementation manner, the successful completion of the first message transmission includes at least one of the following: the terminal device receives a contention resolution message, and the terminal device receives a cell radio network temporary identifier C-RNTI A scrambled physical downlink control channel PDCCH transmission message, the terminal device receives a PDCCH transmission message scrambled by a configured and scheduled radio network temporary identifier CS-RNTI, or the terminal device receives a radio resource control RRC message.

In yet another possible implementation manner, if the first message satisfies at least one of the following items, the terminal device does not start the first timer; the at least one item includes: the first message is carried in a CCCH message In; the first message is the first message or the second message sent by the terminal device to the network device during the SDT process; the first message is the first physical uplink shared channel PUSCH during the SDT process The message transmitted, the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is not successfully completed.

In a possible implementation manner, the transmission of the first message is not successfully completed, including at least one of the following: the terminal device does not receive a contention resolution message, and the terminal device does not receive a temporary identifier issued by the wireless network of the cell. Physical downlink control channel PDCCH transmission message scrambled by C-RNTI, the terminal device has not received the PDCCH transmission message scrambled by the configured scheduling radio network temporary identifier CS-RNTI, or the terminal device has not received radio resource control RRC information.

In a possible implementation manner, 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 uploaded uplink shared channel resource is available and the size of the uplink shared channel resource may include the size of the BSR MAC CE plus its subheader, and the first message includes the BSR MAC CE.

The tenth aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a first message and starts a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; if The transmission of the first message is unsuccessful, the first timer expires, and the terminal device does not trigger or ignore or give up the first random access.

In the above method, the first message transmission is not successful, the first timer expires, and the terminal device does not trigger or ignore or give up the first random access mode, which can reduce the regular BSR triggered by the first timer overtime, thereby reducing the There is no authorized resource to trigger a scheduling request SR, thereby reducing the situation of triggering random access due to lack of SR resources, so that the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and network equipment to the terminal device Identify and deal with access exceptions, thereby improving the success rate of SDT access.

In yet another possible implementation manner, the unsuccessful transmission of the first message includes: the second timer expires; or, If the second timer is running, the terminal device receives a second message, and the first identifier in the second message does not match the second identifier in the first message; or, if the second timer is running, The terminal device receives a second message, and the second message indicates a negative acknowledgment NACK;

In yet another possible implementation manner, the second message is a response message to the first message. For example, in the RA-SDT process, the second message may be a contention resolution message; in the CG-SDT process, the second message may be a response message or an acknowledgment message.

In yet another possible implementation manner, the terminal device does not trigger or ignore or give up the first random access, including: if the terminal device does not have physical uplink control channel PUCCH resources for scheduling request SR, the terminal device The device does not trigger or ignores or aborts the first random access.

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

In yet another possible implementation manner, the first timer includes a retransmission buffer status report timer retxBSR-Timer; the second timer includes a contention resolution timer or a physical downlink control channel PDCCH monitoring timer.

The eleventh aspect of the embodiment of the present application discloses a communication method, including: the terminal device sends a third message, the third message is a retransmission message of the first message, and the redundancy version RV used in the third message is the same as The RV versions of the first messages are the same.

In the above method, by fixing the redundant version RV number of the autonomous retransmission, the success rate of the autonomous retransmission is improved, thereby increasing the access success rate of the SDT.

In a possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; the first message is the terminal device during the small data transmission SDT process The first message or the second message sent to the network device; or the first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message .

In yet another possible implementation manner, the first message is transmitted on configured authorized resources.

In yet another possible implementation manner, the third message is transmitted on configured authorized resources.

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

The twelfth aspect of the embodiment of the present application discloses a communication device. The communication device may be the terminal device or the chip in the terminal device as described in any one of the first to eleventh aspects above. corresponding to the above method Means or modules. For example, the communication device: includes a processing unit (also referred to as a processing module sometimes) and a communication unit (also referred to as a communication module sometimes), wherein: the processing unit is configured to send a first message through the communication unit, and start the second A timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit is configured to stop the first timing when the transmission of the first message is unsuccessful device.

Wherein: the processing unit is configured to send a first message through the communication unit and start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit, It is used to trigger the first BSR when the first timer expires, the logical channel of the device contains uplink data, and a first condition is met, the first condition includes: the first timer expires until The first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires; or,

Wherein: the processing unit is configured to send a first message through the communication unit and start a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit, When the first timer expires, the logical channel of the device contains uplink data, and the first condition is not met, the first BSR is not triggered, and the first condition includes: the first The timer expires until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires.

Wherein: the processing unit is configured to send a first message through the communication unit and start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit, It is configured to trigger a regular buffer status report regular BSR when the first timer expires and the logical channel of the device contains uplink data; the processing unit is configured to trigger the regular BSR without There are available resources for uplink transmission, and the regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process; trigger a scheduling request SR.

Wherein: the processing unit is configured to send a first message through the communication unit and start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit, It is configured to trigger a regular buffer status report regular BSR when the first timer expires and the logical channel of the device contains uplink data; the processing unit is configured to trigger the regular BSR without resources for uplink transmission are available, and the regular BSR is triggered in the inactive state or is triggered during the small data transmission SDT process, the scheduling request SR is not triggered.

Wherein: the processing unit is used to report that the regular BSR is triggered in the normal buffer status, there are no available uplink transmission resources, and the regular BSR is not triggered in the inactive state or not in the small data transmission SDT process If triggered, a Scheduling Request SR is triggered.

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

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

Wherein: the communication unit is configured to send a first message, and the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit is configured to satisfy at least the following requirements in the first message In the case of one item, start the first timer; the at least one item includes: the first message is not carried in the common control channel CCCH message; the first message is not sent to the network during the small data transmission SDT process The first message sent by the device or the second message; the first message is not the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is successfully completed.

Wherein: the processing unit is configured to send a first message through the communication unit and start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit, For not triggering or ignoring or giving up the first random access when the first message transmission is unsuccessful and the first timer expires; or, wherein: the processing unit is configured to pass the communication The unit sends a third message, where 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.

For another example, the communications apparatus includes: a processor, coupled to a memory, configured to execute instructions in the memory, so as to implement the method performed by the terminal device in any one of the first to seventh aspects above. Optionally, the communication device further includes other components, for example, an antenna, an input and output module, an interface, and the like. These components can be hardware, software, or a combination of software and hardware.

The thirteenth aspect of the embodiment of the present application discloses a communication device, the device includes a memory and a processor, the memory is used to store instructions, and the processor is used to call and run the An instruction, so that the communication device executes any one of the above-mentioned aspects or a possible implementation manner in any one of the aspects.

The fourteenth aspect of the embodiment of the present application discloses a chip system, the chip system includes at least one processor and a communication interface, and the at least one processor is used to execute computer programs or instructions, so as to realize any of the above aspects. method.

The fifteenth aspect of the embodiment of the present application discloses a computer-readable storage medium, where computer instructions are stored in the computer-readable storage medium, and when the computer instructions are run on a processor, to implement the described method.

The sixteenth aspect of the embodiments of the present application discloses a computer program product, the computer program product includes computer program code, and when the computer program code is run on a computer, the method described in any one of the above aspects is implemented.

Description of drawings

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

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

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

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

FIG. 4 is a schematic flowchart of a communication method provided in an embodiment of the present application;

FIG. 5 is a schematic flowchart of another communication method provided by the embodiment of the present application;

FIG. 6 is a schematic flow diagram of another communication method provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 9 is a schematic flowchart of another communication method provided by an embodiment of the present application;

FIG. 10 is a schematic flowchart of another communication method provided by an embodiment of the present application;

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

Fig. 12 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

Detailed ways

Embodiments of the present application are described below with reference to the drawings in the embodiments of the present application.

The technical solution provided by this application can be applied to various communication systems, and the technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system. This application is not limited to this. 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 (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5th Generation, 5G) mobile communication system or new radio access technology (NR). Wherein, the 5G mobile communication system may include non-standalone networking (non-standalone, NSA) and/or standalone networking (standalone, SA).

The technical solution provided by this application can also be applied to machine type communication (machine type communication, MTC), inter-machine communication long-term evolution technology (long term evolution-machine, LTE-M), device-to-device (device-to-device, D2D) A network, a machine to machine (M2M) network, an Internet of things (IoT) network, or other networks. Wherein, the IoT network may include, for example, the Internet of Vehicles. Among them, the communication methods in the Internet of Vehicles system are collectively referred to as vehicle to other devices (vehicle to X, V2X, X can represent anything), for example, the V2X can include: vehicle to vehicle (vehicle to vehicle, V2V) communication, vehicle and Infrastructure (vehicle to infrastructure, V2I) communication, vehicle to pedestrian (vehicle to pedestrian, V2P) or vehicle to network (vehicle to network, V2N) communication, etc.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a communication system 100 applicable to an embodiment of the present application. The communication system 100 includes a network device 111, a terminal device 101, a terminal device 102, a terminal device 103, a terminal device 104, device 105 and terminal device 106. It should be understood that the communication system 100 may include more network devices or more or less terminal devices. Network devices and terminal devices can be hardware, or functionally divided software, or a combination of the above two. Network devices and terminal devices can communicate through other devices or network elements. In this system, the network device 111 can perform data transmission with multiple terminal devices, that is, the network device 111 sends downlink data to the terminal device 101-terminal device 106, of course, the terminal device 101-terminal device 106 can also send uplink data to the network device 111 data. In addition, the terminal device 104, the terminal device 105 and the terminal device 106 can also form a communication system, in which the network device 111 can send downlink data to the terminal device 101, the terminal device 102 and the terminal device 105, and then the terminal device 105 The downlink data is sent 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 equipment, including user equipment (UE), including equipment that provides voice and/or data connectivity to users, specifically, equipment that provides voice to users, or equipment that provides data connectivity to users , or include devices that provide voice and data connectivity to users. Examples may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem. The terminal device can communicate with the core network via a radio access network (radio access network, RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal device may include UE, wireless terminal device, mobile terminal device, device-to-device communication (device-to-device, D2D) terminal device, vehicle-to-everything (V2X) terminal device, machine-to-machine/machine-like Communication (machine-to-machine/machine-type communications, M2M/MTC) terminal equipment, Internet of things (internet of things, IoT) terminal equipment, light terminal equipment (light UE), reduced capability user equipment (reduced capability UE, REDCAP UE), subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access Access terminal (access terminal), user terminal (user terminal), user agent (user agent), or user equipment (user device), etc. For example, it may include mobile phones (or "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer built-in mobile devices, and the like. For example, personal communication service (personal communication service, PCS) telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) telephone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA) and other devices. Also includes constrained devices, such as devices with low power consumption, or devices with limited storage capacity, or computing power devices with limited power, etc. For example, it includes barcodes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning system (global positioning system, GPS), laser scanners and other information sensing devices. The various terminal devices described above, if located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as vehicle-mounted terminal devices. The vehicle-mounted terminal device is also called an on-board unit (OBU). ). In this embodiment of the present application, the terminal device may further include a relay (relay). Or it can be understood that all devices capable of performing data communication with the base station can be regarded as terminal devices.

As an example but not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc., which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes wait. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

In this embodiment of the present application, the device for realizing the function of the terminal device may be the terminal device, or may be a device capable of supporting the terminal device to realize the function, such as a chip system, and the device may be installed in the terminal device. In the embodiment of the present application, the system-on-a-chip may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by taking the terminal equipment as an example for realizing the terminal functions.

2) Network equipment, for example including access network (access network, AN) equipment, such as base stations (for example, access points), can refer to equipment in the access network that communicates with wireless terminal equipment through one or more cells through the air interface , or for example, a network device in a vehicle-to-everything (V2X) technology is a road side unit (RSU). The base station can be used to convert received over-the-air frames to and from IP packets, acting as a router between the terminal device and the rest of the access network, which can include an IP network. The RSU can be a fixed infrastructure entity supporting V2X applications, and can exchange messages with other entities supporting V2X applications. The network device can also coordinate the attribute management of the air interface. For example, the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in the LTE system or long term evolution-advanced (LTE-A), or may also include the fifth generation mobile The next generation node B (next generation node B, gNB) in the communication technology (the 5th generation, 5G) NR system (also referred to as NR system) may also include the cloud access network (cloud radio access network, Cloud RAN) system The centralized unit (centralized unit, CU) and distributed unit (distributed unit, DU) in the present application are not limited.

The network device may also include a core network device, and the core network device includes, for example, an access and mobility management function (access and mobility management function, AMF), a user plane function (user plane function, UPF) or a session management function (session management function, SMF) wait.

In the embodiment of the present application, the device for realizing the function of the network device may be a network device, or a device capable of supporting the network device to realize the function, such as a chip system, and the device may be installed in the network device. In the technical solution provided by the embodiment of the present application, the technical solution provided by the embodiment of the present application is described by taking the network device as an example for realizing the function of the network device.

In the description of this application, words such as "first", "second", "S401", or "S402" are only used for the purpose of distinguishing the description and the convenience of the context, and the different sequence numbers themselves have no specific technical meaning , can not be understood as indicating or implying relative importance, nor can it be understood as indicating or implying the execution order of operations. The execution order of each process should be determined by its function and internal logic.

The term "and/or" in this application is just an association relationship describing associated objects, which means that there may be three relationships, for example, "A and/or B" can mean: A exists alone, A and B exist simultaneously, and There are three cases of B, where A and B can be singular or plural. In addition, the character "/" in this article indicates that the contextual objects are an "or" relationship.

In this application, "transmission" may include the following three situations: sending of data, receiving of data, or sending of data and receiving of data. In this application, "data" may include service data and/or signaling data.

The terms "comprising" or "having" and any variations thereof in this application are intended to cover a non-exclusive inclusion, for example, a process/method comprising a series of steps, or a system/product/equipment comprising a series of units, without necessarily limiting Instead, other steps or elements not explicitly listed or inherent to the process/method/product/apparatus may be included.

In the description of the present application, unless otherwise specified, the number of nouns means "singular noun or plural noun", that is, "one or more". "At least one" means one or more. "Including at least one of the following: A, B, C." means that it may include A, or include B, or include C, or include A and B, or include A and C, or include B and C, or include A, B, and c. Among them, A, B, and C can be single or multiple.

First of all, some terms used in this application are explained to facilitate the understanding of those skilled in the art.

Terminal devices in the inactive (RRC_INACTIVE) state support SDT, specifically, support RA-based small data transmission, that is, RA-SDT and SDT transmission based on configured grant (CG, configured grant) type 1 (type1) resources, that is, CG -SDT.

(1) The RA-SDT process, as shown in Figure 2, is as follows:

Step 0: The network device sends a radio resource control release (RRCRelease) message to the terminal device in the RRC_INACTIVE state or the connected (RRC_CONNECTED) state, and correspondingly, the terminal device receives the RRCRelease message from the network device. This message includes information such as radio bearers (radio bearers, RB) configuration for small data transmission in the inactive state. For example, radio bearers for small data transmission include data radio bearers (data radio bearers, DRB) and signaling radio Bearer (signaling radio bearers, SRB). Optionally, the message may also include configuration information for configuration authorization for small data transmission in the RRC_INACTIVE state. The message may also include a data volume threshold for small data transmission, and/or a Reference Signal Received Power (RSRP) threshold. Correspondingly, after receiving the RRCRelease message, the terminal device enters the RRC_INACTIVE state. When the terminal device in the RRC_INACTIVE state meets the small data transmission conditions and selects small data transmission based on random access based on the SDT selection standard, the terminal device initiates the RA-SDT process. Wherein, the small data transmission conditions include: 1) the amount of data is less than a first threshold, the first threshold is configured by the network device in the system information or in the RRCRelease message; 2) reference signal receiving power (reference signal receiving power , RSRP) is greater than the second threshold, the second threshold is configured by the network device in the system information or configured in the RRCRelease message; 3) all data to be sent are mapped to the radio bearer used for SDT. In addition, for small data transmission conditions based on random access, it also includes the availability of random access resources for SDT.

Step 1: The terminal device sends a random access preamble (preamble) to the network device, and correspondingly, the network device receives the preamble from the network device. Specifically, the terminal device sends a random access preamble (preamble) on a physical random access channel (physical random access channel, PRACH), and this message may be called message 1 (message 1, msg1). Among them, the main 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 itself and the terminal device. The estimated delay value is included in the random access response, used It is used to adjust the uplink sending time of the terminal equipment. Usually, the network device notifies the terminal device of the time-frequency resource set of the PRACH that the current cell can use for small data transmission preamble through the system message, the terminal device selects the PRACH resource in the time-frequency resource set, and then sends the preamble on the selected PRACH resource, that is, 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 called message 2 (message 2, msg2). After sending the random access preamble, the terminal device starts a random access response window to receive a random access response RAR message from the network device. Wherein, the RAR message includes preamble identification information, timing advance (timing advance, TA) information, uplink grant (uplink grant, UL grant) information. Optionally, the RAR message may also include temporary cell radio network temporary identity (TC-RNTI) information of the terminal device. 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 step 1, and if they are the same, it is considered that the RAR message is received successfully .

Step 3: The terminal device sends an initial uplink message to the network device, and correspondingly, the network device receives the initial uplink message from the terminal device. It should be understood that the initial uplink message is the first uplink message except the random access preamble in the RA-SDT process. Specifically, the terminal device sends an initial uplink message to the network device through a physical uplink shared channel (PUSCH) on the corresponding uplink resource according to the uplink authorization information in the RAR message. The initial uplink message can also be called the first Uplink message, the message may be called message 3 (message 3, msg3). The first uplink message includes a radio resource control (radio resource control, RRC) message, for example, an RRC resume request (RRCResumeRequest) message. The message includes identification information of the terminal device, such as cell-radio network temporary identifier (C-RNTI) or small data transmission-radio network temporary identifier (SDT-RNTI) Or TC-RNTI or inactive-radio network temporary identifier (I-RNTI) or fifth-generation system temporary mobile subscriber identity (5G system-temporary mobile subscriber identity, 5G-S-TMSI) or random value . Optionally, according to the logical channel priority, the initial uplink message may also include one or more of the following: data on the radio bearer configured for small data transmission, BSR MAC CE, power headroom report (power headroom report, PHR) MAC CE, small data transmission assistance information (SDT assistance information, SAI) MAC CE, padding bits.

After sending message 3, the terminal device starts a contention resolution timer, and the terminal device monitors the PDCCH to obtain a contention resolution response message from the network device. The duration of the contention resolution timer can be 8 milliseconds (ms), 16ms, 24ms, 32ms, 40ms, 48ms, 56ms, 64ms. Optionally, the terminal device sends an initial uplink message, and the terminal device recovers configured RBs for SDT, including DRBs and/or SRBs. It can also restore the packet data convergence protocol (PDCP) configuration and the mapping of the quality of service (QoS) flow to the DRB; it can also restore the logical channel configuration; it can also restore the RRC configuration, radio link control (radio link control, RLC) configuration, etc. Optionally, if the initial uplink message includes BSR MAC CE, the terminal device will start the retransmission buffer status report timer (retxBSR-Timer) after sending the initial uplink message to the network device, for example, the duration of the retxBSR-Timer is 80ms .

Step 4: The network device sends a contention resolution message to the terminal device. Correspondingly, the terminal device receives the contention resolution message from the network device. The contention resolution message may be called message 4 (message 4, msg4).

Since message 3 carries the identification information of the terminal device, in the contention resolution mechanism, the network device will carry the identification information of the terminal device through msg4 to designate the winning terminal device in the contention resolution. Specifically, if the contention resolution received by the terminal device If the message matches the information in message 3, it is considered that the contention resolution is successful; or the terminal device judges whether the contention resolution is successful by receiving the PDCCH scrambled by the C-RNTI. Specifically, if the terminal device receives the PDCCH scrambled by the C-RNTI PDCCH, the contention resolution is successful. When the contention of the terminal device is resolved successfully, the identification information of the terminal device is upgraded 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 a 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, it is considered that the contention resolution fails . Optionally, the terminal device initiates the RA-SDT process from step 1 again. In this embodiment of the application, the initial stage of SDT may refer to In the process, the terminal device sends an initial uplink message to the network device and receives a contention resolution message from the network device.

Step 5: The network device sends the authorized resource or message to the terminal device, and accordingly, the terminal device receives the authorized resource or message from the network device. Specifically, the authorization resource may be an uplink authorization 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, downlink control information (downlink control information, DCI) message, etc.; it should be understood that when the contention is successfully resolved, if message 3 includes BSR MAC CE and/or SAI MAC CE, which indicates that there is still subsequent data to be transmitted, the network device can schedule the subsequent transmission authorization through dynamic scheduling The resource is used for subsequent data transmission, including subsequent uplink transmission and/or downlink transmission.

The follow-up data has the following situations: (1) The initial data of the terminal device is larger than the data that can be accommodated by the first uplink grant (that is, the initial uplink grant allocated in message 2). In this case, the terminal device needs to For the segmented data, the remaining data after sending on the first uplink authorization resource is the follow-up data. (2) During the current SDT data transmission process, new SDT data arrives, and this data can also be called follow-up data.

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

It should be understood that if in step 3, the auxiliary information of the terminal device, such as BSR or SAI, indicates that there is no subsequent data transmission, step 5 and step 6 are not performed.

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

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

Step 0: The network device sends an RRCRelease message to the terminal device in the inactive state or the connected state, and correspondingly, the terminal device in the inactive state or the connected state receives the RRCRelease message from the network device. The message includes configuration information of configuration authorization for small data transmission in the inactive state and information such as signaling radio bearer configuration for small data transmission in the inactive state, where the radio bearer includes DRB and/or SRB. Optionally, the message may also include a data amount threshold for small data transmission, and/or a reference signal received power (RSRP) threshold. Correspondingly, after receiving the RRCRelease message, the terminal device enters the RRC_INACTIVE state. When the terminal device in the RRC_INACTIVE state meets the small data transmission conditions and selects the CG-based small data transmission based on the CG-SDT selection standard, the terminal device initiates the CG-SDT process. Wherein, the small data transmission conditions may refer to the small data transmission conditions in the RA-SDT process, which will not be repeated here. In addition, for small data transmission conditions based on configuration authorization, it also includes the availability of CG resources for SDT.

The selection of CG-based small data transmission by the terminal device also includes that the terminal device is configured with CG-SDT on the selected carrier, and the configured authorized resource is valid. If the configured CG-SDT resource is based on the reference signal received power (synchronization signal based reference signal received power, ss-RSRP) is higher than the fifth threshold, and the terminal device selects CG-SDT. Wherein, the configured resources are valid may include: compared with the downlink path loss reference RSRP value stored in the last uplink transmission of the terminal device, the RSRP does not increase or decrease by more than the sixth threshold; where the fifth threshold is set by the network device in the system information Configured in the RRCRelease message or configured in the RRCRelease message, the threshold used for SSB selection; the sixth threshold is configured by the network device in the system information or configured in the RRCRelease message, used for CG valid judgment or CG timing ahead of TA Validation threshold.

The terminal device initiates the CG-based small data transmission process, and the terminal device selects a value higher than the fifth threshold according to the fifth threshold A synchronization signal and a PBCH block (synchronization signal and PBCH block, SSB), and a CG configuration or a CG resource associated with the SSB.

Step 1: The terminal device sends an initial uplink message to the network device, and correspondingly, 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, refer to the description in step 3 in the RA-SDT process. Correspondingly, after the terminal device sends an initial uplink message to the network device, it will start the PDCCH monitoring timer and monitor the PDCCH to receive a response or confirmation message from the network device; wherein, the PDCCH monitoring timer is used for the terminal device to monitor during the CG-SDT process. Addressed to the PDCCH of the C-RNTI; the optional PDCCH monitoring timer is configured in the RRCRelease message. Optionally, if the initial uplink message includes BSR MAC CE, the terminal device will start retxBSR-Timer after sending the initial uplink message to the network device. Optionally, the terminal device may restore configured RBs for SDT, including DRBs and SRBs. It can also restore PDCP configuration and the mapping of QoS flow to DRB; it can also restore logical channel configuration; it can also restore RRC configuration, RLC configuration, etc.

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

It should be understood that, if the terminal device receives the response message from the network device before the PDCCH monitoring timer times out or expires, the terminal device considers that the transmission of the initial uplink message is successful. If the PDCCH monitoring timer expires or expires, and the terminal device does not receive a response message from the network device, it is considered that the initial uplink message transmission fails. Specifically, the response message may be an uplink authorization or downlink assignment for new transmission, or a DCI or RRC message, etc.; correspondingly, the terminal device will retransmit the initial uplink message. It can be further understood that the CG-SDT transmission is restarted from step 1. It should be understood that the response message of the network device may be a confirmation message of the network device.

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

Step 3: Optionally, the network device sends the 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 authorization resource may be an uplink authorization 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, etc.; it should be understood that when the initial uplink The message transmission is successful. If the initial uplink message includes BSR MAC CE, PHR MAC CE, and/or SAI MAC CE, which indicates that there is still subsequent data to be transmitted, the network device can schedule the authorized resources for subsequent transmission through dynamic scheduling. for subsequent data transfers. Regarding the situation of subsequent data, reference may be made to the description in step 5 in the above-mentioned RA-SDT process.

Step 4: The terminal device transmits subsequent data on the authorized resource. Optionally, the terminal device can perform data transmission on the authorized resource dynamically scheduled by the network device; in addition, the terminal device can also use the CG resource for subsequent data transmission in the subsequent transmission, specifically, send the data at the next available opportunity of the CG resource follow-up data.

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

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

(3) Buffer status report BSR: It is a way for terminal equipment to apply for uplink resources from network equipment. When the terminal is set When the device and the network device need to exchange data, the terminal device needs to inform the network device of the 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 sent. However, the terminal device needs uplink resources to send BSR to the network device. If the terminal device does not have uplink resources, it cannot send the BSR MAC CE to the network device. The terminal device can apply for resources in the following two ways, namely SR and random access. The method of applying for uplink resources through scheduling requests can only notify the network device that there is data to be sent, that is, there is a request for resource application, but the size of the requested resource is unknown, and the terminal device still needs to tell the network device the requested resource size through BSR , usually after the network device receives the SR, the allocated resources can at least satisfy the sending of the BSR. The way to obtain uplink resources through random access is to tell the network device the required resource information by carrying the BSR MAC CE in the random access message 3 . Wherein, the priority of BSR is higher than that of SR, and the priority of SR is higher than that of random access.

(4) Retransmission buffer status report timer (retxBSR-Timer): reduce the sending of the situation where the terminal device has sent a BSR but has not received the UL grant from the network device for a long time. Optionally, during the SDT process, the BSR is configured through a default (default) MAC cell group configuration. In this configuration, the duration of the retxBSR-Timer is 80 subframes, that is, 80ms. If at least one BSR is triggered and has not been cancelled, and if resources for uplink new transmission are available and can accommodate the BSR MAC CE plus its subheader, the terminal device starts or restarts the timer retxBSR-Timer. The retxBSR-Timer is restarted when a grant for a new transmission is received from a network device on any uplink shared channel (UL-SCH). When the retxBSR-Timer times out and any logical channel in any logical channel group (logic channel group, LCG) of the terminal device has data to transmit, the BSR will be triggered, and the BSR can also be called a regular (regular) BSR . When a regular BSR is triggered and the timer for delaying SR transmission is not running, if there are no resources for uplink transmission, the terminal device triggers an SR. Because in the SDT process, the network device will not configure SR resources, that is, because there are no resources for SR, the terminal device will trigger a random access process.

(5) Radio resource control RRC state, the terminal device has three RRC states: RRC connected state (RRC_CONNECTED state), RRC idle state (RRC_IDLE state) and RRC inactive state (RRC_INACTIVE state). RRC connection state (or, can also be referred to as connection state for short. In this article, "connection state" and "RRC connection state" are the same concept, and the two terms can be interchanged): the terminal device has established an RRC connection with the network, and can for data transfer. RRC idle state (or, can also be referred to as idle state for short. In this article, "idle state" and "RRC idle state" are the same concept, and the two terms can be interchanged): the terminal device has not established an RRC connection with the network, and the base station No context is stored for this end device. If the terminal device needs to enter the RRC connected state from the RRC idle state, it needs to initiate an RRC connection establishment process. RRC inactive state (or, can also be referred to as inactive state for short. In this article, "deactivated state", "deactivated state", "inactive state", "RRC inactive state" and "RRC deactivated state" , are the same concept, these types of names can be interchanged): the terminal device entered the RRC connection state before, and then the network device released the RRC connection, but the network device saved the context of the terminal device. If the terminal device needs to enter the RRC connection state again from the RRC inactive state, it needs to initiate an RRC connection restoration process. Compared with the RRC establishment process, the RRC recovery process has shorter delay and less signaling overhead. However, the network device needs to save the context of the terminal device, which will occupy the storage overhead of the base station.

In RA-SDT or CG-SDT, the terminal device sends the second message or the first message to the network device. After the first message can be called the initial uplink message, it will start the contention resolution timer or PDCCH monitoring timer , when the second message or the first message includes BSR information, for example, BSR MAC CE, the terminal device starts the retransmission buffer status report timer (retxBSR-Timer), optionally, the duration of retxBSR-Timer is longer than the contention The duration of the resolution timer or the duration of the PDCCH monitoring timer. If the contention resolution fails, or the PDCCH monitoring timer expires or the response message from the network device is not received, that is, the initial uplink message transmission fails, the retxBSR-Timer continues to run until Timeout, when the retxBSR-Timer times out, because the logical channel contains data to be transmitted, the terminal device will trigger a regular (regular) BSR, Since there is no uplink resource for sending regular BSR, the terminal device triggers SR, but in the process of RA-SDT or CG-SDT, the network device does not configure SR resources for the terminal device, then the terminal device will PUCCH resources to trigger a random access procedure to obtain resources. However, at this time, the terminal device re-performs the random access process of RA-SDT when the contention resolution fails or re-performs the initial uplink message transmission (ie retransmission) of CG-SDT when the initial uplink message transmission fails. The terminal device has not established a connection with the network device, and the PUCCH resource that is not used for SR is introduced during RA-SDT to trigger the random access process, or the terminal device selects the PUCCH resource that is not used for SR to trigger the random access process. In the RA-SDT process or CG-SDT process, that is, the connection between the terminal device and the network device is not established, and a network abnormality will occur, resulting in RA-SDT or CG-SDT failure. Therefore, in order to solve the above problems, the embodiment of this application proposes the following solution plan.

Please refer to Figure 4, Figure 4 is a communication method provided by the embodiment of this application, which includes but is 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 to start a first timer.

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

Specifically, the first message may satisfy at least one of the following: the first message is carried in a common control channel (common control channel, CCCH) message; the first message is the first message sent by the terminal device to the network device during the SDT process or The second message; or the first message is the first message transmitted on the PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message, wherein the CCCH message may be an RRC recovery request message. When the first message is the first message or the second message sent by the terminal device to the network device during the SDT process, the number of transmissions of the first message is not limited here, and it can be transmitted once or multiple times. The second time, 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 during the SDT process. Wherein, the first message may be an initial uplink message in the CG-SDT process, and the second message may be message 3 (msg3) in the RA-SDT process. The alternative description that the first message can satisfy each of the following at least one item can be: the first message is the message transmitted by the first transport block (transport block, TB) in the SDT process; the first message is the message transmitted in the SDT process The initial transmission message; the first message is the message included in the initial transmission message in the SDT process; or the first message is the initial PUSCH transmission message in the SDT process.

Specifically, the first message may include BSR MAC CE. The details are as follows: if at least one BSR is triggered and has not been canceled, optionally, the at least one BSR is the BSR corresponding to the BSR MAC CE of the logical channel of the SDT or the logical channel group; if the uplink shared channel resource for the new transmission is available , and according to the logical channel priority result, the size of the uplink shared channel resource may include the size of the BSR MAC CE plus its subheader, and 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 subheader 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 subheader. Optionally, the first message may be BSR MAC CE. Optionally, the first message may also include PHR MAC CE and SAI MAC CE. The first message includes the BSR MAC CE indicating the cached data margin in the SDT process, the network device can determine the data volume of the terminal device based on the BSR MAC CE, and the subsequent transmission situation.

Optionally, the first message may be replaced by a BSR, that is, the terminal device sends a BSR to the network device to start 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 transmission of the first message is unsuccessful, the terminal device stops the first timer.

Specifically, unsuccessful transmission of the first message may be an optional condition. The unsuccessful transmission of the first message may refer to the second The timer expires, or, the second message is received before the second timer expires but the first identifier in the second message does not match the second identifier in the first message, or, the second message is received before the second timer expires A second message is received but the second message indicates a negative acknowledgment (negative-acknowledgment, NACK), where the second message may be a response message or an acknowledgment message of the first message. Wherein, the timeout of the second timer can be understood as that the terminal device does not receive the second message before the second timer expires, or the terminal device does not receive the second message until the second timer expires. Optionally, after the terminal device sends the first message, the terminal device starts the second timer. The second timer may include a contention resolution timer or a PDCCH monitoring timer. For example, in the RA-SDT process, the second timer is a contention resolution timer; in the CG-SDT process, the second timer is a PDCCH monitoring timer. When the second timer is a PDCCH monitoring timer, the second timer is used for the terminal device to monitor the PDCCH to receive a response message or confirmation message from the network device. For example, the PDCCH monitoring timer may be a contention resolution timer, or CG-SDT The small data transmission timer (cg-SDT-Timer) based on configuration authorization in the process. It can be understood that when the PDCCH monitoring timer is running, the terminal device monitors or receives DCI, or physical downlink control channel PDCCH or layer 1 feedback, or uplink grant, or downlink feedback, or hybrid automatic repeat query (hybrid automatic repeat query, HARQ) message or automatic repeat query (automatic repeat query, ARQ) message or RRC message. Optionally, if the PDCCH monitoring timer is running, the terminal device monitors the PDCCH. Optionally, the duration of the first timer is longer than the duration of the second timer. The timeout of the second timer can be understood as exceeding the agreed duration or configured duration of the second timer. For example, the duration of the second timer is 64ms. When the second timer starts to count until the 64th ms, the second timer does not expire. Timeout, when it is greater than 64ms, the second timer times out. It should be understood that the expiry of the second timer may also be referred to as the expiry of the second timer.

Specifically, the fact that the first identifier in the second message does not match the second identifier in the first message or that the second message indicates a negative response may mean that before the second timer expires or while the second timer is running, the second message The first identifier in the message does not match the second identifier in the first message or the second message indicates NACK. The first ID and the second ID can be used to identify the terminal device. The first ID and the second ID can be the same or different. The mismatch between the first ID and the second ID can mean that the values of the first ID and the second ID are different. , or, some values in the first identifier may be different from the second identifier. Wherein, the second identifier may be a unique identifier of the terminal device, such as 5G-S-TMSI, C-RNTI or a random value, and the second identifier may also be a CCCH service data unit (service data unit, SDU). For example, in an example, in the RA-SDT process, for the four-step random access process, the first message may be message 3, the second message may be message 4, and message 3 contains the second identifier, that is, C- RNTI, message 4 contains the first identifier, that is, the contention resolution identifier, wherein the contention resolution identifier in message 4 is different from the C-RNTI contained in message 3, for example, the C-RNTI value in message 3 is in hexadecimal 0001, and the contention resolution identifier in message 4 is hexadecimal 0002, it is considered that the first identifier, that is, hexadecimal 0002, does not match the second identifier, hexadecimal 0001; if message 3 contains the second identifier, namely CCCH SDU, message 4 contains the first identifier, that is, the contention resolution identifier, wherein, the contention resolution identifier in message 4 is different from the first 48 bits of the CCCH SDU in message 3, then it is considered that the first identifier, that is, the contention resolution identifier and the second identifier That is, the CCCH SDUs do not match. In yet another example, in the two-step random access process, the first message may be a msgA message, the second message may be a MsgB message, the msgA message includes the second identifier, that is, the CCCH SDU, and the MsgB message includes the first identifier , that is, the contention resolution identification, wherein, if the 48 bits of the contention resolution identification MAC CE in the MsgB message are not exactly the same as the first 48 bits of the CCCH SDU sent in the msgA message, then it is considered that the first identification does not match the second identification. In yet another example, in the CG-SDT process, the PDCCH received by the terminal device is not scrambled by the C-RNTI of the terminal device in the current cell, which can also be understood as the first identifier in the second message and the first identifier in the second message. The second identifier in a message does not match. Among them, the msgA message in the two-step random access process can be understood as message 1 and message 3 in the four-step random access process, and the MsgB message in the two-step random access process can be understood as message 1 and message 3 in the four-step random access process. Message 2 and Message 4.

Specifically, the second message may include at least one of the following: contention resolution message, PDCCH scrambled by C-RNTI The transmission message is a PDCCH transmission message scrambled by a configured scheduling radio network temporary identity (CS-RNTI), or a radio resource control RRC message. Wherein, when the second message includes the contention resolution message, it can be understood that the second message may be message 4 (msg4) or message B (MsgB) in the RA-SDT process. 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 the RA-SDT process or in the CG-SDT During the process, 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 the CG-SDT process, and optionally, the PDCCH transmission message scrambled by the CS-RNTI may indicate the use of Uplink authorization or downlink allocation for retransmission. Optionally, 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 a HARQ feedback, or an ARQ feedback, or a message transmitted on a physical downlink shared channel PDSCH .

Optionally, if the first message is successfully transmitted, 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 expires, or the second message is received before the second timer expires and the first identifier in the second message is the same as that in the first message. or the second message is received before the second timer expires and the second message indicates an acknowledgment (acknowledgment, ACK), where the second message is a response message or an acknowledgment message of the first message. Specifically, the successful transmission of the first message includes at least one of the following: the terminal device receives a contention resolution message, the terminal device receives a PDCCH transmission message scrambled by a C-RNTI, and the terminal device receives a PDCCH transmission message scrambled by a CS-RNTI message, or the terminal device receives an RRC message. The reception of the contention resolution message by the terminal device may be interpreted as the terminal device receiving message 4 (msg4) or message B (MsgB) from the network device during the RA-SDT process. The terminal device receiving the PDCCH transmission message scrambled by C-RNTI can be understood as the terminal device listening to the PDCCH transmission message scrambled by CS-RNTI, and the terminal device can be in the process of RA-SDT or in the process of CG-SDT , optionally, the PDCCH message scrambled by the C-RNTI may indicate uplink grant or downlink allocation for new transmission. The terminal device receiving the PDCCH transmission message scrambled by the CS-RNTI can be understood as the terminal device listening to the PDCCH transmission message scrambled by the CS-RNTI. Optionally, the terminal device may be in the process of CG-SDT. Optionally, The PDCCH transmission message scrambled by the CS-RNTI may indicate uplink grant or downlink allocation for retransmission. Optionally, an alternative description that the first message transmission successfully includes at least one of the following items may be: the terminal device receives the DCI, the terminal device receives a layer 1 feedback message, and the terminal device receives an ARQ acknowledgment (acknowledgment, ACK ) message, or the terminal device receives a HARQ confirmation message. For example, for the RA-SDT process, the transmission of the first message is successful, including but not limited to, if the terminal device receives the C-RNTI scrambled PDCCH, the terminal device considers the contention resolution successful; or if the msg3 message carries The identification information of the message matches the information in the msg4 message, or the identification information carried by the terminal device in the msgA message matches the information in the MsgB message. For example, in the CG-SDT process, the successful transmission of the first message can be understood as the terminal device receiving an acknowledgment message for the first message from the network device, which can further be understood to include but not limited to: the terminal device’s PDCCH monitoring timer expires Before receiving a dynamically scheduled uplink grant from a network device, or a dynamically scheduled downlink assignment from a network device, or DCI or MAC CE, or layer 1 ACK, or downlink feedback information (DFI) or ARQ ACK.

In the above method, a new condition for stopping the first timer is introduced. By stopping the first timer unsuccessfully in the first message transmission, it can reduce the regular BSR triggered by the timeout of the first timer, and further reduce the The scheduling request SR is triggered, thereby reducing the occurrence of triggering random access due to lack of SR resources. In this way, the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device and the network device's interaction with the terminal device. Identify and deal with access exceptions, thereby improving the success rate of SDT access.

Please refer to Figure 5, Figure 5 is a communication method provided by the embodiment of this application, which includes but is not limited to the following steps:

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

For details, reference may be made to step S401, which will not be repeated here.

Step S502: If the first timer expires, the logical channel of the terminal device contains uplink data, and the first condition is met, the terminal device triggers a first BSR.

Specifically, the timeout of the first timer can be understood as exceeding the agreed duration or configured duration of the first timer. For example, the duration of the first timer is 80ms. None of the timers has timed out, and when it is greater than the 80th ms, the first timer has timed out. The fact that the logical channel contains uplink data may refer to data to be transmitted on the logical channel or buffered data on the logical channel. Optionally, the logical channel corresponds to the SDT RB, which can be one-to-one or one-to-many, which is not limited here. Wherein, the replacement description corresponding to the logical channel and the SDT RB may 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 that the first timer expires until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires. It can be understood that the first BSR is not triggered until the first timer expires until the first message is successfully transmitted after the first timer expires. It can further be understood that: if the first timer expires, the logical channel contains uplink data, and the transmission of the first uplink message is successful, and the terminal device triggers a first BSR. Wherein, the first timer times out before the first uplink message is successfully transmitted. In an example, the first timer expires at time T1, and the first message is successfully transmitted at time T2, where time T2 is after time T1 in time, then the terminal device does not trigger the first BSR at time T1 until T2 The first BSR is triggered after time T2 or time T2. Optionally, the first BSR includes a regular BSR. The first message is successfully transmitted until the first timer expires. It can be understood that the first message is transmitted successfully and then the first BSR is not triggered until the first timer expires. It can be further understood as: if the first timer expires, and the The first timer times out after the first uplink message is successfully transmitted, the logical channel contains uplink data, and the terminal device triggers the first BSR. In another example, the first message is successfully transmitted at time T3, and the first timer expires at time T4, where time T3 is before time T4, then the terminal device may trigger the first message at time T4 or after time T4. a BSR.

Specifically, the successful transmission of the first message includes at least one of the following: the terminal device receives a contention resolution message, the terminal device receives a PDCCH transmission message scrambled by a C-RNTI, and the terminal device receives a PDCCH transmission message scrambled by a CS-RNTI message, or the terminal device receives an RRC message. For details, reference may be made to related descriptions in step S402, which will not be repeated here.

Optionally, if the first timer expires, the logical channel of the terminal device contains uplink data, and the first condition is not met, the terminal device does not trigger the first BSR.

In the above method, a new condition for triggering BSR is introduced. By triggering the first BSR when the first timer expires, the logical channel contains uplink data, and the first condition is met, the number of terminal devices and network devices can be reduced. Trigger the occurrence of the first BSR when the connection is not established, thereby reducing the situation of triggering the scheduling request SR due to no authorization, and triggering random access due to the lack of SR resources. In this way, the terminal device can continue the current SDT process, thereby It reduces the access abnormality of terminal equipment, and the identification and processing of abnormal terminal equipment access by network equipment, thereby improving the success rate of SDT access.

Please refer to Figure 6, Figure 6 is a communication method provided by the embodiment of this application, which includes but is 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 the RRC inactive state or the RRC idle state, and the terminal device is in the SDT process or the EDT process, and it can also be understood that the execution of steps S601-S603 is in the SDT process or the EDT process.

Specifically, the first message may include the BSR MAC CE. For details, please refer to the description in step S401. Let me repeat.

Specifically, the first message may satisfy at least one of the following: the first message is carried in the CCCH message; the first message is the first message or the second message sent by the terminal device to the network device during the SDT process; or the first message It is the first message transmitted on the PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message, wherein the CCCH message may be an RRC recovery request message. For details, reference may be made to the description in step S401, which will not be repeated here.

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

Specifically, the timeout of the first timer can be understood as exceeding the agreed duration or the configured duration of the first timer. For details, reference can be made to the description in step S502, which will not be repeated here. The fact that the logical channel contains uplink data may refer to data to be transmitted on the logical channel or buffered data on the logical channel. Optionally, the logical channel corresponds to the SDT RB, which can be one-to-one or one-to-many, which is not limited here. Wherein, the replacement description corresponding to the logical channel and the SDT RB may 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 are no available uplink transmission resources, and if the regular BSR is not triggered in the inactive state or not triggered during the SDT process, the terminal device triggers a scheduling request SR.

Specifically, if the regular BSR is triggered and there are no available uplink transmission resources, optionally, the regular BSR is not triggered in the RRC inactive state or is not triggered during the SDT process, the terminal device triggers a scheduling request SR. Further, if the regular BSR is triggered, optionally, the delayed SR timer is not running, there are no resources for uplink transmission available, and optionally, the regular BSR is not triggered in the inactive state or is not triggered during the SDT Yes, the terminal device triggers an SR. Optionally, no available uplink transmission resources may refer to no available uplink new transmission resources. No resources for uplink transmission available may refer to no resources, or resources but not available.

Specifically, the regular BSR is not triggered in the inactive state or is not triggered during the SDT process, which may mean that the regular BSR is not triggered at the initial stage of the SDT process, or the regular BSR is during the SDT process It is triggered after the contention resolution is successful, or the regular BSR is triggered when the contention resolution is successfully completed during the SDT process, or the regular BSR is triggered after the RA-SDT random access process is successfully completed, or the regular The 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 when the terminal device establishes a connection with the network device , or the regular BSR is triggered after the terminal device receives an acknowledgment message from the network device for the first message; or the regular BSR is triggered when the terminal device receives a confirmation message for the first message from the network device response message, or the regular BSR is triggered after the terminal equipment receives the PDCCH transmission message scrambled by the C-RNTI, or the regular BSR is triggered when the terminal equipment receives the PDCCH transmission message scrambled by the CS-RNTI The scrambled PDCCH transmission message is triggered, or the regular BSR is triggered after the terminal device receives the RRC message, or the regular BSR is triggered after the terminal device receives DCI or DFI or HARQ or ARQ, Optionally, the DCI or DFI or HARQ or ARQ is a response message or confirmation message for the first message of the terminal device. Wherein, the regular BSR is triggered after the terminal device receives the confirmation message for the first message from the network device. It can also be understood that the regular BSR is triggered after the terminal device receives the confirmation message for the first message from the network device Triggered when a message is acknowledged. The regular BSR is triggered when the terminal device receives a response message from the network device for the first message. triggered after a response message, and/or the regular BSR is triggered when the terminal device receives a response message from the network device for the first message triggered. 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 is triggered. 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 is triggered. The regular BSR is triggered after the terminal device receives the RRC message, and it can also be understood that the regular BSR is triggered when the terminal device receives the RRC message.

It should be noted that, in this embodiment of the present application, optionally, "after" can also be interpreted as "in the case of", or "not before", or "at the time of". For example, the regular BSR is triggered after the contention is successfully resolved during the SDT process. It can be understood that the regular BSR is triggered when the contention is successfully resolved during the SDT process, or the regular BSR is not competitive during the SDT process. It is triggered before the resolution is successful, or the regular BSR is triggered when the competition is successfully resolved during the SDT process.

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

Among them, whether the regular BSR is triggered in the inactive state or is triggered in the SDT process is a negative description of whether the regular BSR is not triggered in the inactive state or is not triggered in the SDT process. For details, please refer to the above The regular BSR is not triggered in the inactive state or is not triggered during the SDT process, and will not be described here.

In the above method, a new condition for triggering SR is introduced. By being triggered on the regular BSR, there are no available uplink transmission resources, and the regular BSR is not triggered in the inactive state or not in the small data transmission SDT process. When triggered, the way the terminal device triggers the scheduling request SR can reduce the triggering of the first BSR when the connection between the terminal device and the network device is not established, and further reduce the triggering of the scheduling request SR due to no authorized resources, thereby reducing the In this case, the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving the SDT access success rate.

Please refer to Figure 7, Figure 7 is a communication method provided by the embodiment of this application, the method includes but is not limited to the following steps:

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

For details, reference may be made to the description in step S601, which will not be repeated here.

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

For details, reference may be made to the description in step S602, which will not be repeated here.

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

Optionally, no available uplink transmission resources may refer to no available uplink new transmission resources. No resources for uplink transmission available may refer to no resources, or resources but not available.

Step S704: If SR is triggered, the logical channel of the terminal device has uplink data, there is no resource for SR, and the second condition is satisfied, the terminal device triggers a random access procedure.

Specifically, the logical channel containing uplink data may refer to data to be transmitted on the logical channel or buffered data on the logical channel. Optionally, the correspondence between logical channels and SDT RBs can be one-to-one or one-to-many, which is not limited here. Wherein, the alternative description corresponding to the logical channel and the SDT RB may be: the logical channel is a channel related to the SDT RB, and the logical channel is the channel for SDT.

Specifically, resources not used for SR may refer to PUCCH resources not used for SR. The second condition may include one or more of the following: the terminal device receives a contention resolution message, the terminal device receives a response message or confirmation message from the network device for the first message, the first message is successfully transmitted, and the SDT initial stage transmission is successful . The reception of the contention resolution message by the terminal device may be interpreted as successful contention resolution during the RA-SDT process. When the terminal device receives a response message or confirmation message for the first message from the network device, optionally, DCI, HARQ, ARQ, DFI, PDCCH, physical downlink shared channel (physical downlink shared channel, PDSCH) or RRC message, etc. is a response message or confirmation message for the first message of the terminal device. The successful transmission of the first message can be understood as that the terminal device receives a response message or confirmation message for the first message from the network device, for example, optionally, a DCI, HARQ, ARQ, DFI, PDCCH, PDSCH or RRC message. The successful transmission in the initial stage of SDT can be understood as the process in which the terminal device sends the first message to the network device and receives the contention resolution message from the network device during the RA-SDT process; or, in the CG-SDT process, the terminal device sends the first message to the network device; A process in which the network device sends the first message and receives a response message from the network device.

In the above method, a new random access trigger condition is introduced. If the SR is triggered, the logical channel of the terminal device has uplink data, and there is no available uplink transmission resource. If the first message satisfies the second condition, random access is triggered. The way of the access process can reduce the triggering of the first BSR when the connection between the terminal device and the network device is not established, thereby reducing the triggering of the scheduling request SR due to lack of authorized resources, thereby reducing the triggering of random access due to the lack of SR resources In this way, the terminal device can continue the current SDT process, thereby reducing the access abnormality of the terminal device, and the network device's identification and processing of the terminal device access abnormality, thereby improving the SDT access success rate.

Please refer to Figure 8, Figure 8 is a communication method provided by the embodiment of this application, the method includes but is not limited to the following steps:

Step S801: the terminal device sends a first message.

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

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

Specifically, the first message includes the BSR MAC CE, for details, reference may be made to the related description in step S401, which will not be repeated here.

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

Optionally, if it is determined that at least one BSR is triggered and has not been canceled, if the uplink shared channel resource for new transmission is available, and according to the logical channel priority result, the size of the uplink shared channel resource can include the BSR MAC CE plus The size of the subheader, the terminal device generates BSR MAC CE during the multiplexing and assembly process, if the terminal device meets at least one of the following, start the first timer.

Specifically, at least one item includes: the first message is not carried in the CCCH message; the first message is not the first message or the second message sent by the terminal device to the network device during the SDT process; the first message is not The first message transmitted on the PUSCH in the SDT process, the message transmitted on the PUSCH includes a CCCH message, where the CCCH message may be an RRC recovery request message; or the transmission of the first message is successfully completed. Specifically, for the relevant description of at least one item, reference may be made to the description in step S401, which will not be repeated here. The successful transmission of the first message includes at least one of the following: 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, the terminal The device receives an RRC message. For details about the successful transmission of the first message, please refer to the description in step S502, which will not be repeated here.

Optionally, the first message may be replaced by a BSR, that is, if the BSR meets at least one of the following items, the terminal device starts the first timer.

In a possible implementation, if the first message satisfies at least one of the following items, the terminal device does not start the first timing device, at least one of the following includes: the first message is the first message or the second message sent by the terminal device to the network device during the SDT process; the first message is the first message transmitted on the PUSCH during the SDT process , the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message has not been successfully completed; for details, please refer to the description in step S401, which will not be repeated here. The unsuccessful transmission of the first message includes at least one of the following: the terminal device does not receive the contention resolution message, the terminal device does not receive the PDCCH transmission message scrambled by the C-RNTI, and the terminal device does not receive the PDCCH scrambled by the CS-RNTI The message is transmitted, or the terminal device does not receive the RRC message; specifically, for the relevant description of at least one item, reference may be made to step S401, which will not be repeated here.

An alternative description of step S802 may be: if the first message is triggered during the SDT process, if the initial uplink transmission of the SDT is successfully completed, start or restart the first timer; otherwise, if the first message is not triggered during the SDT process , to start or restart the first timer.

Specifically, the first message includes the BSR MAC CE, or the first message is the BSR MAC CE. Optionally, the first message satisfies at least one of the following: the first message is the first message or the second message sent by the terminal device to the network device in the SDT process; the first message is the first message in the SDT process A message transmitted on the PUSCH, the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is not successfully completed. For details, reference may be made to the description in step S401, which will not be repeated here.

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

In the above method, a new condition for starting the first timer is introduced, and the first message meets at least one of the following items to start the first timer, which can reduce the triggering of the terminal device and the network device when no connection is established. The first BSR, thereby reducing the triggering of scheduling request SR due to lack of authorized resources, thereby reducing the situation of triggering random access due to lack of SR resources. In this way, the terminal device can continue the current SDT process, thereby reducing the access of the terminal device Abnormalities, as well as network equipment identification and processing of terminal equipment access abnormalities, thereby improving the success rate of SDT access.

Please refer to Figure 9, Figure 9 is a communication method provided by the embodiment of this application, which includes but is not limited to the following steps:

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

For details, reference may be made to the description in step S401, which will not be repeated here.

Step S902: If the transmission of the first message is not successful, if the first timer expires, the terminal device does not trigger or ignore or give up the first random access.

Specifically, unsuccessful transmission of the first message may be an optional condition. For details of unsuccessful transmission of the first message, reference may be made to the description in step S402, which will not be repeated here. For the timeout of the first timer, reference may be made to the description in step S502, which will not be repeated here. The first random access refers to triggering a random access procedure because there is no PUCCH resource for SR.

Specifically, the terminal device not triggering or ignoring or giving up the first random access includes: if the terminal device has no PUCCH resource for SR, the terminal device does not trigger or ignore or give up the first random access. Optionally, the first message is sent during the random access process based on the second random access SDT, that is, RA-SDT; wherein, the priority of the first random access is the lowest; or the first random access The priority of random access is lower than that of the second random access. That is to say, the priority of triggering random access because there is no PUCCH resource for SR is lower than the priority of random access in the RA-SDT process. It can also be understood that during the random access process of RA-SDT, if the random access process is triggered due to lack of SR resources, the random access priority triggered due to lack of SR resources is lower than that of the random access process of RA-SDT. In the access process, the terminal device ignores or gives up the random access triggered due to lack of SR resources, and continues the current RA-SDT process; it should be The solution is that the terminal device triggers another random access while the RA-SDT random access process is in progress, and the terminal device chooses to continue the current RA-SDT process by means of implementation.

Optionally, the first message is sent during the CG-SDT process. The terminal device chooses to give up or ignore the random access triggered because there is no resource for SR through implementation, and continues the current CG-SDT process.

In the above method, the first message transmission is not successful, the first timer expires, and the terminal device does not trigger or ignore or give up the first random access mode, which can reduce the situation that the network device and the terminal device are not connected, and reduce the due to Random access is triggered due to lack of SR resources. In this way, the terminal device can continue the current SDT process, thereby reducing the access exception of the terminal device, and the identification and processing of the abnormal access of the terminal device by the network device, thereby improving SDT access success rate. Further, for RA-SDT, the occurrence of RA-SDT suspension caused by another random access trigger during the random access process of RA-SDT is reduced; for CG-SDT, the failure of CG-SDT to access successfully Under certain circumstances, the suspension of CG-SDT or the occurrence of abnormal situations caused by random access triggered by lack of SR resources are reduced, thereby improving the access success rate of the small data transmission process.

Please refer to Figure 10, Figure 10 is a communication method provided by the embodiment of this application, which includes but is not limited to the following steps:

Step S1001: the terminal device sends a first message.

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

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

Optionally, the first message is transmitted on configured authorized resources.

Step S1002: the terminal device sends a third message.

Optionally, the terminal device may send the third message to the network device. The third message may be a retransmission message of the first message. For example, in step 3 in Figure 2 or in step 1 in Figure 3, the terminal device sends an initial uplink message to the network device, if the transmission of the initial uplink message fails, for example, no response message from the network device is received within a preset time , the terminal device needs to retransmit the initial uplink message. Optionally, multiple transmissions are required, and the terminal device sends a third message, which is a retransmission message of the initial uplink message. For example, in the embodiments described in FIGS. 4-9 , the third message is a retransmission message of the first message.

Optionally, the first message is an initial transmission message in the CG-SDT process, and the third message is an autonomous retransmission message for the initial transmission, wherein, in the CG-SDT process, the third message is a Autonomous transfers use 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 uplink message. Optionally, the redundancy version RV number of the third message is a positive integer, such as 0, or 1, or 2, or 3, or 4.

Optionally, the third message is transmitted on configured authorized resources.

It should be noted that the embodiments in this application can be applied to the small data transmission process based on two-step random access. Any combination can be made between different embodiments in this application; any combination can be made between the steps of the same embodiment; any combination can be made between the steps of different embodiments; wherein, Fig. 2 or Fig. 3 can be combined arbitrarily with Fig. 4-Fig. 10 . Figure 2 or Figure 3 can be combined with any steps in Figure 4-Figure 9, for example, the method shown in Figure 2 above can be combined with the method shown in Figure 4 above Applicable, for example, S401 can be step 3 in Fig. 2, or step 1 in Fig. 2, step 2 in Fig. 2 and S401, S402 form a scheme, or any one or more steps in Fig. 2 and Fig. 4 Any one or more steps can be arbitrarily combined into a scheme. Different figures and steps between different embodiments may also be partially combined, which is not limited in this application. Certain steps in the embodiments of the present application are not necessarily executed in strict order. In some cases, the order of different steps is not in particular order, (that is, it can be understood that the steps in the embodiment can be adjusted); different steps can also be performed simultaneously; this application does not limit this. The embodiments of the communication method provided in this application are only for illustration and do not constitute any limitation. For example, one or several steps in any one of the foregoing communication method embodiments may be omitted, that is, the device (eg, terminal device or network device) may not perform the omitted steps.

The method of the embodiment of the present application has been described in detail above, and the device of the embodiment of the present application is provided below.

Please refer to FIG. 11 . FIG. 11 is a schematic structural diagram of a communication device 1100 provided by an embodiment of the present application. The communication device 1100 may include a communication unit 1101 and a processing unit 1102 , where each unit is described in detail as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101 to start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 , configured to stop the first timer when the transmission of the first message is unsuccessful.

In yet another possible implementation manner, the communication unit 1101 is further configured to not receive the second message before the second timer expires; or, to receive the second message before the second timer expires but the The first identifier in the second message does not match the second identifier in the first message; or, the second message is received before the second timer expires, and the second message indicates a negative acknowledgment 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, and the second message in the second message The first identifier does not match the second identifier in the first message; or, when the second timer is running, a second message is received, and the second message indicates a negative acknowledgment NACK.

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

In yet another possible implementation manner, the communication unit 1101 is configured to not receive the second message when the second timer expires.

In yet another possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; the first message is sent to the The first message or the second message sent by the network device; or the first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.

In yet another possible implementation, the BSR corresponding to the BSR MAC CE is triggered and not canceled; if the uplink shared channel resource for new transmission is available and the size of the uplink shared channel resource can include the BSR MAC CE plus the size of its subheader, the first message includes the BSR MAC CE.

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

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

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

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101 and start a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 , configured to trigger the first BSR when the first timer expires, the logical channel of the device contains uplink data, and a first condition is met, the first condition includes: the first timer expires until the first message is successfully transmitted, or until the first message is successfully transmitted until the first timer times out.

In a possible implementation manner, the successful transmission of the first message includes at least one of the following: 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 configured and scheduled wireless network temporary identifier CS-RNTI, receiving a radio resource control RRC message, the terminal device receiving an automatic repeat request confirmation ARQ ACK message, or the terminal device receiving Hybrid Automatic Repeat Request acknowledges HARQ ACK messages.

In yet another possible implementation manner, the processing unit 1102 is further configured to: when the first timer expires, the logical channel of the device contains uplink data, and the first condition is not met, The first BSR is not triggered.

It should be noted that the implementation and beneficial effects of each unit may also refer to corresponding descriptions of the method embodiment shown in FIG. 5 .

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101 and start a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 , used to not trigger the first BSR when the first timer expires, the logical channel of the device contains uplink data, and the first condition is not met, and the first condition includes: the first condition A timer expires until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires.

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101 and start a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 , for when the first timer expires, And when the logical channel of the device contains uplink data, a regular buffer status report regular BSR is triggered; the processing unit 1102 is configured to trigger the regular BSR and there are no available uplink transmission resources, and the When the regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process; trigger the 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 the inactive state or is not triggered during the small data transmission SDT process, including: the regular BSR is not triggered during the initial stage of the SDT process Triggered, or the regular BSR is triggered after the contention is successfully resolved during the SDT process, or the regular BSR is triggered when the contention resolution is successfully completed during the SDT process, or the regular BSR is triggered based on random access It is triggered after the incoming 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 The BSR is triggered when the device establishes a connection with the network device, or the regular BSR is triggered after the device receives an acknowledgment message from the network device for the first message ; or the regular BSR is triggered when the device receives a response message from the network device for the first message, or the regular BSR is triggered when the device receives a temporary It is triggered after the physical downlink control channel PDCCH transmission message scrambled by C-RNTI is identified, or the regular BSR is triggered after the device receives a PDCCH transmission message scrambled by the configured scheduling wireless network temporary identification CS-RNTI , or the regular BSR is triggered after the device receives a radio resource control RRC message.

In yet another possible implementation manner, the processing unit 1102 is configured to be triggered when the regular BSR is triggered, and the timer for delaying the SR is not running, there is no available uplink transmission resource, and the regular BSR is not Inactive is triggered or not during SDT; triggers SR.

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

In yet another possible implementation manner, the regular BSR is triggered in the inactive state or during the SDT process, including: the regular BSR is triggered at the initial stage of the SDT process, Or the regular BSR is not triggered after the contention resolution is successful during the SDT process, or the regular BSR is not triggered when the contention resolution is successfully completed during the SDT process, or the regular BSR is not triggered during the SDT based on random access was triggered after successful completion, or the regular BSR was not triggered after the first message transmission was successfully completed, or the first message transmission was not successfully completed when the regular BSR was triggered, or the regular BSR It is not triggered when the connection between the device and the network device is established, or the regular BSR is not triggered after the device receives an acknowledgment message from the network device for the first message; or the regular BSR is not triggered when the device receives a response message from the network device for the first message, or the regular BSR is not triggered when the device receives a scrambled by C-RNTI is triggered after the PDCCH transmission message, or the regular BSR is not triggered after the device receives the PDCCH transmission message scrambled by CS-RNTI, or the regular BSR is not triggered after the device receives the RRC message triggered afterwards.

It should be noted that the implementation and beneficial effects of each unit can also refer to the corresponding description of the method embodiment shown in FIG. 6 .

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

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to report that the regular BSR is triggered when there is no available uplink transmission resource, and the regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process In the case of a trigger, a scheduling request SR is triggered.

In a possible implementation manner, the processing unit 1102 is further configured to send a first message through the communication unit 1101 to start a first timer, and the first message includes a buffer status report BSR media 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 the logical channel of the device contains uplink data; or, at There is new uplink data on a logical channel, and when the priority of the first logical channel is higher than that of any logical channel containing available uplink data in any logical channel group, a regular buffer status report is triggered BSR, wherein the first logical channel is any one of the logical channels of the device or any one of the logical channels associated with the SDT.

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

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to trigger a random access process when a scheduling request SR is triggered, the logical channel of the terminal device has uplink data, there is no resource for SR, and the second condition is met; the The second condition includes one or more of the following: a contention resolution message is received, a response message or confirmation message for the first message is received from the network device, or the first message is successfully transmitted.

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 The processing unit 1102 is configured to trigger a regular buffer status report regular BSR when the first timer expires and the logical channel of the device contains uplink data; The BSR is triggered, and when there are no available uplink transmission resources, a scheduling request SR is triggered.

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

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to not trigger a random access process when the scheduling request SR is triggered, the logical channel of the terminal device has uplink data, there is no resource for SR, and the second condition is not met; The second condition includes one or more of the following: a contention resolution message is received, a response message or confirmation message for the first message is received from the network device, or the first message is successfully transmitted.

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The communication unit 1101 is configured to send a first message, and the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 is configured to satisfy at least the following requirements in the first message: In the case of one item, start the first timer; the at least one item includes: the first message is not carried in the common control channel CCCH message; the first message is not sent to the network during the small data transmission SDT process The first message or the second message sent by the device; the first message is not the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message; or the first message A message transmission completed successfully.

In a possible implementation manner, the successful completion of the first message transmission includes at least one of the following: receiving a contention resolution message, receiving a physical downlink control channel PDCCH scrambled by a cell radio network temporary identifier C-RNTI For transmitting a message, a PDCCH transmission message scrambled by a configured and scheduled radio network temporary identifier CS-RNTI is received, or a radio resource control RRC message is received.

In yet another possible implementation manner, the processing unit 1102 is configured to not start the first timer when the first message satisfies at least one of the following items; the at least one item includes: the first A message is carried in the CCCH message; the first message is the first message or the second message sent by the device to the network device in the SDT process; the first message is the first message in the SDT process A message transmitted on the physical uplink shared channel PUSCH, where the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is not successfully completed.

In yet another possible implementation manner, the transmission of the first message is not successfully completed, including at least one of the following: no contention resolution message is received, no physical message scrambled by the cell radio network temporary identifier C-RNTI is received For the downlink control channel PDCCH transmission message, the PDCCH transmission message scrambled by the CS-RNTI configured and scheduled radio network temporary identifier 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 refer to the corresponding description of the method embodiment shown in FIG. 8 .

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to send a first message through the communication unit 1101 to start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE; the processing unit 1102 , configured to not trigger or ignore or give up the first random access when the transmission of the first message fails and the first timer expires.

In a possible implementation manner, the communication unit 1101 is configured to not receive the second message before the second timer expires; or, receive the second message but the second The first identifier in the message does not match the second identifier in the first message; or, a second message is received before the second timer expires, and the second message indicates a negative acknowledgment NACK; wherein, the first 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, and the first message in the second message An identifier does not match the second identifier in the first message; or, the communication unit is configured to receive a second message when the second timer is running, and the second message indicates a negative acknowledgment NACK .

In yet another possible implementation manner, the processing unit 1102 is configured not to trigger or ignore or give up the first random access when the device has no physical uplink control channel PUCCH resource for scheduling request SR enter.

In yet another possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; The first message or the second message sent to the network device; or the first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message .

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

Optionally, the detailed description of each unit in the communication device 1100 may also be as follows. The processing unit 1102 is configured to send a third message through the communication unit 1101, 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 that of the first message The RV version of the same.

In a possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; the first message is the terminal device during the small data transmission SDT process to the network The first message or the second message sent by the device; or the first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.

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

Please refer to FIG. 12. FIG. 12 is a communication device 1200 provided by an embodiment of the present application. The communication device 1200 includes at least one processor 1201 and a communication interface 1203. Optionally, it also includes a memory 1202. 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 (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), the memory 1202 is used for related computer programs and data. The communication interface 1203 is used to receive and send data.

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

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, start a first timer; the first message It includes a buffer status report BSR medium access control MAC control element CE; the processor 1201 is configured to stop the first timer when the transmission of the first message is unsuccessful.

In yet another possible implementation manner, the processor 1201 is configured to not receive the second message through the communication interface 1203 before the second timer expires; or, receive the second message before the second timer expires. Two messages but the first identifier in the second message does not match the second identifier in the first message; or, a second message is received before the second timer expires, and the second message indicates a negative acknowledgment 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 processor 1201 is configured to receive a second message through the communication interface 1203 when the second timer is running, and the the first identifier in the second message does not match the second identifier in the first message; or, with the second timer running, a second message is received indicating a negative acknowledgment NACK.

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

In yet another possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; the first message is sent to the sent by the network device A message or a second message; or the first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.

It should be noted that the implementation and beneficial effects of each operation may also refer to corresponding descriptions of the method embodiment shown in FIG. 4 .

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, start a first timer, and the first message Including a buffer status report BSR media access control MAC control element CE; the processor 1201 is configured to: when the first timer expires, the logical channel of the device contains uplink data, and the first condition is met , triggering the first BSR, where the first condition includes: the first timer expires until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires.

In a possible implementation manner, the successful transmission of the first message includes at least one of the following: 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 configured and scheduled wireless network temporary identifier CS-RNTI, or receiving a radio resource control RRC message, the terminal device receives an automatic repeat request confirmation ARQ ACK message, or the terminal device receives To Hybrid Automatic Repeat Request Acknowledgment HARQ ACK message.

In yet another possible implementation manner, the processor 1201 is further configured to: when the first timer expires, the logical channel of the device contains uplink data, and the first condition is not met, The first BSR is not triggered.

It should be noted that the implementation and beneficial effects of each operation may also refer to corresponding descriptions of the method embodiment shown in FIG. 5 .

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, start a first timer, and the first message Including a buffer status report BSR media access control MAC control element CE; when the first timer expires, the logical channel of the device contains uplink data, and the first condition is not met, the first timer is not triggered. BSR, the first condition includes: the first timer expires until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires.

It should be noted that the implementation and beneficial effects of each operation can also refer to the corresponding method embodiment shown in FIG. 5 should be described.

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, start a first timer, and the first message Including a buffer status report BSR media access control MAC control element CE; the processor 1201 is configured to trigger a normal buffer when the first timer expires and the logical channel of the device contains uplink data Status report regular BSR; the processor 1201 is configured to be triggered when the regular BSR has no uplink transmission resources available, and the regular BSR is not triggered in the inactive state or not in the SDT process of small data transmission In the case of being triggered; a scheduling request SR is triggered.

In a possible implementation manner, the processor 1201 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 processor 1201 is configured to be triggered when the regular BSR is triggered, and the timer for delaying the SR is not running, there are no available uplink transmission resources, and the regular BSR is not Inactive is triggered or not during SDT; triggers SR.

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

In yet another possible implementation manner, the regular BSR is triggered in an inactive state or is triggered during the SDT process, including: the regular BSR is triggered at the initial stage of the SDT process, Or the regular BSR is not triggered after the contention resolution is successful during the SDT process, or the regular BSR is not triggered when the contention resolution is successfully completed during the SDT process, or the regular BSR is not triggered during the SDT based on random access is triggered after successful completion, or the regular BSR is not triggered after the first message transmission is successfully completed, or the first message transmission is not successfully completed when the regular BSR is triggered, or the regular BSR is not triggered when the connection between the device and the network device is established, or the regular BSR is not triggered after the device receives an acknowledgment message from the network device for the first message; Or the regular BSR is not triggered when the device receives a response message from the network device for the first message, or the regular BSR is not triggered when the device receives a scrambled by C-RNTI is triggered after the PDCCH transmission message, or the regular BSR is not triggered after the device receives the PDCCH transmission message scrambled by CS-RNTI, or the regular BSR is not triggered after the device receives the RRC message triggered afterwards.

It should be noted that, the implementation and beneficial effects of each operation may also refer to corresponding descriptions of the method embodiment shown in FIG. 6 .

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, start a first timer; the first message Include a buffer status report BSR media access control MAC control element CE; when the first timer expires and the logical channel of the device contains uplink data, trigger a regular buffer status report regular BSR; in the When the regular BSR is triggered and there are no available uplink transmission resources, and the regular BSR is triggered in the inactive state or is triggered during the small data transmission SDT process, the scheduling request SR is not triggered.

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: when the regular buffer status report regular BSR is triggered, there is no available uplink transmission resource, and the When the regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process, a 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 to start a first timer, where the first message includes a buffer status report BSR media 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 the logical channel of the device contains uplink data; or, at There is new uplink data on a logical channel, and when the priority of the first logical channel is higher than that of any logical channel containing available uplink data in any logical channel group, a regular buffer status report is triggered BSR, wherein the first logical channel is any one of the logical channels of the device or any one of the logical channels associated with the SDT.

The processor 1201 in the communication device 1200 is used to read the computer program code stored in the memory 1202, and perform the following operations: when the scheduling request SR is triggered, the logical channel of the device has uplink data, and there is no SR resources, and when the second condition is met, the random access process is triggered; the second condition includes one or more of the following: receiving a contention resolution message, receiving a response message from the network device for the first message or A confirmation message, or the transmission of the first message is successful.

In a possible implementation manner, 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; when the first timer expires and the logical channel of the device contains uplink data, trigger a regular buffer status report regular BSR; when the regular BSR is triggered, there is no available uplink transmission In the case of resources, a Scheduling Request SR is triggered.

In yet another possible implementation, the BSR corresponding to the BSR MAC CE is triggered and not cancelled; if the uplink shared channel resource for new transmission is available and the size of the uplink shared channel resource can include the BSR MAC CE plus the size of its subheader, the first message includes the BSR MAC CE.

It should be noted that, the implementation and beneficial effect of each operation may also refer to the corresponding description of the method embodiment shown in FIG. 7 .

The processor 1201 in the communication device 1200 is used to read the computer program code stored in the memory 1202, and perform the following operations: when the scheduling request SR is triggered, the logical channel of the device has uplink data, and there is no SR resources, and the random access process is not triggered if the second condition is not met; the second condition includes one or more of the following: receiving a contention resolution message, receiving a response to the first message from a network device message or confirmation message, or that the first message was successfully transmitted.

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, and the first message includes a buffer status report BSR A medium access control MAC control element CE; the processor 1201 is configured to start a first timer when the first message satisfies at least one of the following items; the at least one item includes: the first message Not carried in the common control channel CCCH message; the first message is not the first message or the second message sent to the network device during the small data transmission SDT process; the first message is not the first message during the SDT process A message transmitted on the physical uplink shared channel PUSCH, where the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is successfully completed.

In yet another possible implementation manner, the processor 1201 is configured to not start the first timer when the first message satisfies at least one of the following items; the at least one item includes: the first A message is carried in the CCCH message; the first message is the first message or the second message sent by the device to the network device in the SDT process; the first message is the first message in the SDT process A message transmitted on the physical uplink shared channel PUSCH, where the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is not successfully completed.

It should be noted that the implementation and beneficial effects of each operation can also refer to the corresponding method embodiment shown in FIG. 8 should be described.

The processor 1201 in the communication device 1200 is configured to read the computer program code stored in the memory 1202, and perform the following operations: send a first message through the communication interface 1203, start a first timer; the first message It includes a buffer status report BSR medium access control MAC control element CE; when the first message transmission is unsuccessful and the first timer expires, the first random access is not triggered or ignored or abandoned.

In a possible implementation manner, the processor 1201 is configured to not receive the second message before the second timer expires; or, receive the second message but the second The first identifier in the message does not match the second identifier in the first message; or, a second message is received before the second timer expires, and the second message indicates a negative acknowledgment NACK; wherein, the first The second message is a response message to the first message.

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

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

In yet another possible implementation manner, the processor 1201 is configured to not trigger or ignore or give up the first random access when the device has no physical uplink control channel PUCCH resource for scheduling request SR. enter.

It should be noted that the implementation and beneficial effects of each operation may also refer to corresponding descriptions of the method embodiment shown in FIG. 9 .

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

In a possible implementation manner, the first message satisfies at least one of the following: the first message is carried in a common control channel CCCH message; the first message is the terminal device during the small data transmission SDT process The first message or the second message sent to the network device; or the first message is the first physical uplink shared signal in the SDT process A message transmitted on the PUSCH, where the message transmitted on the PUSCH includes a CCCH message.

It should be noted that the implementation and beneficial effects of each operation may also refer to corresponding descriptions of the method embodiment shown in FIG. 10 .

It can be understood that the processor in the embodiments of the present application may be a CPU, or other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. Software instructions can be composed of corresponding software modules, and software modules can 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 hard 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. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC can be located in the base station or the terminal. Certainly, the processor and the storage medium may also exist in the base station or the terminal as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits 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 or a data center integrating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; or it may be a semiconductor medium, such as a solid state disk. The computer readable storage medium may be a volatile or a nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

Claims

A communication method, characterized in that, comprising:

The terminal device sends a first message to start a first timer; the first message includes a buffer status report BSR medium access control MAC control element CE;

If the transmission of the first message is not successful, the terminal device stops the first timer.
The method according to claim 1, wherein the unsuccessful transmission of the first message comprises:

the second timer expires; or,

The second timer is running, the terminal device receives a second message, and the first identifier in the second message does not match the second identifier in the first message; or,

The second timer is running, and the terminal device receives a second message indicating a negative acknowledgment NACK.
The method according to claim 2, wherein the second message includes at least one of the following: a contention resolution message, a physical downlink control channel (PDCCH) transmission message scrambled by the cell wireless network temporary identifier C-RNTI, configured by Scheduling a PDCCH transmission message scrambled by the radio network temporary identifier CS-RNTI, or a radio resource control RRC message.
The method according to claim 2 or 3, characterized in that,

The first timer includes a retransmission buffer status report timer retxBSR-Timer, and the second timer includes a contention resolution timer or a PDCCH monitoring timer.
The method according to any one of claims 1-4, wherein the first message satisfies at least one of the following:

The first message is carried in the common control channel CCCH message; the first message is the first message or the second message sent by the terminal device to the network device during the SDT process of small data transmission; or the The first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.
The method according to any one of claims 1-5, characterized in that,

The terminal equipment is in an RRC inactive state or an RRC idle state.
A communication method, characterized in that, comprising:

The terminal device sends a first message to start a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE;

If the first timer expires, the logical channel of the terminal device contains uplink data, and the first condition is met, the terminal device triggers the first BSR, and the first condition includes: the first timer expires until The first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires.
The method according to claim 7, wherein the successful transmission of the first message includes at least one of the following:

The terminal device receives the contention resolution message, the terminal device receives the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI, and the terminal device receives the radio network temporary identifier specified by the configuration scheduling A PDCCH transmission message scrambled by the CS-RNTI, or the terminal device receives a radio resource control RRC message.
The method according to claim 7 or 8, wherein the first message satisfies at least one of the following:

The first message is carried in the common control channel CCCH message; the first message is the first message or the second message sent by the terminal device to the network device during the SDT process of small data transmission; or the The first message is the first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.
The method according to any one of claims 7-9, characterized in that,

The logical channel corresponds to the SDT radio bearer RB.
The method according to any one of claims 7-10, wherein the first timer includes a retransmission buffer status report timer retxBSR-Timer.
The method according to any one of claims 7-11, wherein the first BSR includes a conventional regular BSR.
The method according to any one of claims 7-12, characterized in that,

The terminal equipment is in an RRC inactive state or an RRC idle state.
A communication method, characterized in that, comprising:

The terminal device sends a first message to start a first timer, and the first message includes a buffer status report BSR medium access control MAC control element CE;

If the first timer expires and the logical channel of the terminal device contains uplink data, the terminal device triggers a regular buffer status report regular BSR;

If the regular BSR is triggered, there are no available uplink transmission resources, and the regular BSR is not triggered in the inactive state or is not triggered during the small data transmission SDT process, the terminal device triggers a scheduling request SR .
The method according to claim 14, characterized in that the method further comprises:

If the terminal device triggers the SR and there is no PUCCH resource for the SR, the terminal device triggers random access.
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 not in a small Triggered during data transmission SDT; the terminal device triggers a scheduling request SR, including:

If the regular BSR is triggered, and the delay SR timer is not running, there are no uplink transmission resources available, and the regular BSR is not triggered in the inactive state or is not triggered during the SDT process; the The terminal device triggers an SR.
The method according to any one of claims 14-16, wherein the method further comprises:

If the regular BSR is triggered, and the timer for delaying the SR is not running, there are no resources for uplink transmission available, and the regular BSR is triggered in an inactive state or during the SDT process; the End devices do not trigger SRs.
The method according to any one of claims 14-17, characterized in that,

The terminal equipment is in an RRC inactive state or an RRC idle state.
A communication method, characterized in that, comprising:

The terminal device sends a first message, where the first message includes a buffer status report BSR medium access control MAC control element CE;

If the first message meets at least one of the following items, the terminal device 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 The first message or the second message sent by the terminal device to the network device during the small data transmission SDT process; the first message is not the first message transmitted on the physical uplink shared channel PUSCH during the SDT process, so The message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is successfully completed.
The method according to claim 19, wherein 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 source is available and the size of the uplink shared channel resource may include the size of the BSR MAC CE plus its subheader, and the first message includes the BSR MAC CE.
The method according to claim 19 or 20, wherein the first timer includes a retransmission buffer status report timer retxBSR-Timer.
The method according to any one of claims 19-21, wherein,

The terminal equipment is in an RRC inactive state or an RRC idle state.
A communication device, characterized in that it includes a communication unit and a processing unit,

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

The processing unit is configured to stop the first timer when the transmission of the first message is unsuccessful.
The device according to claim 23, characterized in that,

the second timer expires; or,

The communication unit is configured to receive a second message when the second timer is running, and the first identifier in the second message does not match the second identifier in the first message; or,

The communication unit is configured to receive a second message when the second timer is running, and the second message indicates a negative acknowledgment NACK.
The device according to claim 23, wherein the second message includes at least one of the following: a contention resolution message, a physical downlink control channel (PDCCH) transmission message scrambled by the cell wireless network temporary identifier C-RNTI, configured by Scheduling a PDCCH transmission message scrambled by the radio network temporary identifier CS-RNTI, or a radio resource control RRC message.
Apparatus according to claim 24 or 25, characterized in that

The first timer includes a retransmission buffer status report timer retxBSR-Timer, and the second timer includes a contention resolution timer or a PDCCH monitoring timer.
The device according to any one of claims 23-26, wherein the first message satisfies at least one of the following:

The first message is carried in the common control channel CCCH message; the first message is the first message or the second message sent to the network device during the small data transmission SDT process; or the first message is The first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.
The device according to any one of claims 23-27, wherein the device is in an RRC inactive state or an RRC idle state.
A communication device, characterized in that it includes: a communication unit and a processing unit,

The processing unit is configured to send a first message through the communication unit, start a first timer, and 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, the logical channel of the device contains uplink data, and a first condition is met, and the first condition includes: the first A timer expires until the first message is successfully transmitted, or the first message is successfully transmitted until the first timer expires.
The device according to claim 29, wherein the successful transmission of the first message includes at least one of the following:

Receive the contention resolution message, receive the physical downlink control channel PDCCH transmission message scrambled by the cell radio network temporary identifier C-RNTI, receive the PDCCH transmission message scrambled by the configured scheduling radio network temporary identifier CS-RNTI, and receive Radio Resource Control RRC message.
The device according to claim 29 or 30, wherein the first message satisfies at least one of the following:

The first message is carried in the common control channel CCCH message; the first message is the first message or the second message sent to the network device during the small data transmission SDT process; or the first message is The first message transmitted on the physical uplink shared channel PUSCH in the SDT process, and the message transmitted on the PUSCH includes a CCCH message.
The device according to any one of claims 29-31, characterized in that,

The logical channel corresponds to the SDT radio bearer RB.
The device according to any one of claims 29-32, wherein the first timer includes a retransmission buffer status report timer retxBSR-Timer.
The device according to any one of claims 29-33, wherein the first BSR comprises a regular regular BSR.
The device according to any one of claims 29-34, characterized in that,

The device is in an RRC inactive state or an RRC idle state.
A communication device, characterized in that it includes: a communication unit and a processing unit,

The processing unit is configured to send a first message through the communication unit, start a first timer, and the first message includes a buffer status report BSR medium 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 the logical channel of the device contains uplink data;

The processing unit is configured to be used when the 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 the small data transmission SDT process ; Trigger a scheduling request SR.
Apparatus according to claim 36, characterized in that,

The processing unit is further configured to trigger random access when the SR is triggered and there is no PUCCH resource for the SR.
Apparatus according to claim 36 or 37, characterized in that

The processing unit is configured to be triggered when the regular BSR is triggered, and the timer for delaying the SR is not running, there are no available uplink transmission resources, and the regular BSR is not triggered in an inactive state or is not in the SDT process Triggered in; Trigger SR.
The device according to any one of claims 36-38, characterized in that,

The processing unit is further configured to be triggered when the regular BSR is triggered, and the timer for delaying the SR is not running, there are no resources for uplink transmission available, and the regular BSR is triggered in the inactive state or in the SDT Triggered during the process; SR is not triggered.
Apparatus according to any one of claims 36-39, characterized in that,

The device is in an RRC inactive state or an RRC idle state.
A communication device, characterized in that it includes: a communication unit and a processing unit,

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

The processing unit is configured to start a first timer when the first message satisfies 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 the first message or the second message sent to the network device during the small data transmission SDT process; the first message is not the first message transmitted on the physical uplink shared channel PUSCH during the SDT process , the message transmitted on the PUSCH includes a CCCH message; or the transmission of the first message is successfully completed.
The apparatus of claim 41 wherein,

The BSR corresponding to the BSR MAC CE is triggered and has not been canceled; if the uplink shared channel resource for new transmission is available and the size of the uplink shared channel resource can include the size of the BSR MAC CE plus its subheader, The first message includes the BSR MAC CE.
The device according to claim 41 or 42, wherein the first timer includes a retransmission buffer status report timer retxBSR-Timer.
The device according to any one of claims 41-43, characterized in that,

The device is in an RRC inactive state or an RRC idle state.
A communication device, characterized by comprising:

memory for storing instructions;

A processor, configured to call and execute the instruction from the memory, so that the communication device executes the method according to any one of claims 1-22.
A computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when executed on a processor, the method according to any one of claims 1-22 is implemented.