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US-12628171-B2 - Method and device for transmitting MAC PDU

US12628171B2US 12628171 B2US12628171 B2US 12628171B2US-12628171-B2

Abstract

A method and device for transmitting a medium access control (MAC) protocol data unit (PDU) is provided. The method includes: identifying, by a hybrid automatic repeat request (HARQ) entity, for an uplink grant, a HARQ process associated with the uplink grant; and obtaining, by the HARQ entity, a MAC PDU to transmit from a HARQ buffer of the identified HARQ process when a particular condition(s) is satisfied. The condition may be that a MAC entity of the HARQ entity is configured with priority based prioritization, the uplink grant is a configured grant, and a previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process.

Inventors

  • Zhe Fu
  • Cong Shi

Assignees

  • GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date
20260512
Application Date
20220228

Claims (16)

  1. 1 . A method for transmitting a medium access control (MAC) protocol data unit (PDU), comprising: identifying, by a hybrid automatic repeat request (HARQ) entity, for an uplink grant, a HARQ process associated with the uplink grant; and obtaining, by the HARQ entity, a MAC PDU to transmit from a HARQ buffer of the identified HARQ process when at least one of following conditions is satisfied: a MAC entity of the HARQ entity is configured with priority based prioritization, and a previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process; the previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process; a previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer had not been successfully transmitted due to overlapping of a physical uplink shared channel (PUSCH) duration of the previous uplink grant with a PUSCH duration of another uplink grant; or the MAC entity is configured with priority based prioritization, the previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer had not been successfully transmitted due to the overlapping; wherein the uplink grant is a configured grant, and the method further comprises: after obtaining the MAC PDU to transmit from the HARQ buffer of the identified HARQ process, delivering, by the HARQ entity, the MAC PDU and the uplink grant and HARQ information of a transport block (TB) to the identified HARQ process; and instructing, by the HARQ entity, the identified HARQ process to trigger a new transmission of which a new data indicator (NDI) bit for the HARQ process is considered as having been toggled, to autonomously retransmit the MAC PDU obtained from the HARQ buffer.
  2. 2 . The method of claim 1 , further comprising: delivering, by the MAC entity, the configured uplink grant and associated HARQ information to the HARQ entity when at least one of following conditions is satisfied: the previous uplink grant delivered to the HARQ entity for the same HARQ process was a configured uplink grant which was de-prioritized; the previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted.
  3. 3 . The method of claim 2 , further comprising: when the HARQ process is configured with a configured grant timer, starting or restarting, by the HARQ entity, the configured grant timer.
  4. 4 . The method of claim 3 , wherein starting or restarting the configured grant timer comprises: starting or restarting the configured grant timer when the MAC entity determines that the transmission is performed.
  5. 5 . The method of claim 1 , wherein when the HARQ process is configured with a configured grant timer, the configured grant timer is not started or restarted when at least one of following conditions is satisfied: the MAC entity is configured with priority based prioritization and the uplink grant is a de-prioritized configured grant; or the MAC entity is configured with priority based prioritization, the uplink grant is a configured uplink grant and the uplink grant is a deprioritized uplink grant.
  6. 6 . A method for transmitting a medium access control (MAC) protocol data unit (PDU), comprising: delivering, by a MAC entity, an uplink grant and associated HARQ information to a HARQ entity of the MAC entity when at least one of following conditions is satisfied: a previous uplink grant delivered to the HARQ entity for a same HARQ process was a configured uplink grant which was de-prioritized; a MAC PDU obtained in a HARQ buffer of the HARQ process had not been successfully transmitted due to overlapping of a physical uplink shared channel (PUSCH) duration of the previous uplink grant with a PUSCH duration of another uplink grant; the previous configured grant for the HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; the MAC entity is configured with priority based prioritization and the previous uplink grant delivered to the HARQ entity for the same HARQ process was a configured uplink grant which was de-prioritized; the MAC entity is configured with priority based prioritization and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; or the MAC entity is configured with priority based prioritization and the previous configured grant for the HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; delivering, by the HARQ entity, the uplink grant and the HARQ information of a transport block (TB) to the HARQ process; and instructing, by the HARQ entity, the HARQ process to trigger an autonomous retransmission, wherein the uplink grant is a configured grant; the method further comprising: identifying, by the HARQ entity, for the uplink grant, the HARQ process associated with the uplink grant; and in response to obtaining a MAC PDU from a HARQ buffer of the identified HARQ process, delivering, by the HARQ entity, the MAC PDU and the uplink grant and HARQ information of the TB to the identified HARQ process; instructing, by the HARQ entity, the identified HARQ process to trigger a new transmission of which a new data indicator (NDI) bit for the HARQ process is considered as having been toggled, to autonomously retransmit the MAC PDU obtained from the HARQ buffer.
  7. 7 . The method of claim 6 , wherein: when the HARQ process is configured with a configured grant timer, the configured grant timer is started or restarted when at least one of following conditions is satisfied: the MAC entity is configured with priority based prioritization and the uplink grant is a de-prioritized configured grant; or the MAC entity is configured with priority based prioritization, the uplink grant is a configured uplink grant and the uplink grant is a deprioritized uplink grant.
  8. 8 . The method of claim 6 , further comprising: when the HARQ process is configured with a configured grant timer, starting or restarting the configured grant timer when the MAC entity determines that the transmission is performed.
  9. 9 . A device for transmitting a medium access control (MAC) protocol data unit (PDU), a memory and a processor, wherein the memory is configured to store instructions executable by the processor, and the processor is configured to execute the instructions stored in the memory to perform operations of a hybrid automatic repeat request (HARQ) entity, wherein the HARQ entity is configured to: identify, for an uplink grant, a HARQ process associated with the uplink grant; and obtain a MAC PDU to transmit from a HARQ buffer of the identified HARQ process when at least one of following conditions is satisfied: a MAC entity of the HARQ entity is configured with priority based prioritization, and a previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process; the previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process; a previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer had not been successfully transmitted due to overlapping of a physical uplink shared channel (PUSCH) duration of the previous uplink grant with a PUSCH duration of another uplink grant; or the MAC entity is configured with priority based prioritization, the previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer had not been successfully transmitted due to the overlapping; wherein the uplink grant is a configured grant, and the HARQ entity is further configured to: after obtaining the MAC PDU to transmit from the HARQ buffer of the identified HARQ process, deliver the MAC PDU and the uplink grant and HARQ information of a transport block (TB) to the identified HARQ process; and instruct the identified HARQ process to trigger a new transmission of which a new data indicator (NDI) bit for the HARQ process is considered as having been toggled, to autonomously retransmit the MAC PDU obtained from the HARQ buffer.
  10. 10 . The device of claim 9 , wherein the MAC entity of the HARQ entity is configured to: deliver the configured uplink grant and associated HARQ information to the HARQ entity when at least one of following conditions is satisfied: the previous uplink grant delivered to the HARQ entity for the same HARQ process was a configured uplink grant which was de-prioritized; the previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted.
  11. 11 . The device of claim 10 , wherein when the HARQ process is configured with a configured grant timer, the HARQ entity is further configured to: start or restart the configured grant timer.
  12. 12 . The device of claim 11 , wherein the HARQ entity is configured to start or restart the configured grant timer when the MAC entity determines that the transmission is performed.
  13. 13 . The device of claim 9 , wherein when the HARQ process is configured with a configured grant timer, the configured grant timer is not started or restarted when at least one of following conditions is satisfied: the MAC entity is configured with priority based prioritization and the uplink grant is a de-prioritized configured grant; or the MAC entity is configured with priority based prioritization, the uplink grant is a configured uplink grant and the uplink grant is a deprioritized uplink grant.
  14. 14 . A device for transmitting a medium access control (MAC) protocol data unit (PDU), a memory and a processor, wherein the memory is configured to store instructions executable by the processor, and the processor is configured to execute the instructions stored in the memory to perform operations of a MAC entity, the MAC entity comprising a hybrid automatic repeat request (HARQ) entity, wherein: the MAC entity is configured to deliver an uplink grant and associated HARQ information to the HARQ entity when at least one of following conditions is satisfied: a previous uplink grant delivered to the HARQ entity for a same HARQ process was a configured uplink grant which was de-prioritized; a MAC PDU obtained in a HARQ buffer of the HARQ process had not been successfully transmitted due to overlapping of a physical uplink shared channel (PUSCH) duration of the previous uplink grant with a PUSCH duration of another uplink grant; the previous configured grant for the HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; the MAC entity is configured with priority based prioritization and the previous uplink grant delivered to the HARQ entity for the same HARQ process was a configured uplink grant which was de-prioritized; the MAC entity is configured with priority based prioritization and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; or the MAC entity is configured with priority based prioritization and the previous configured grant for the HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; the HARQ entity is configured to: deliver the uplink grant and the HARQ information of a transport block (TB) to the HARQ process; and instruct the HARQ process to trigger an autonomous retransmission, wherein the uplink grant is a configured grant; wherein the HARQ entity is further configured to: identify, for the uplink grant, the HARQ process associated with the uplink grant; and in response to obtaining a MAC PDU from a HARQ buffer of the identified HARQ process, deliver the MAC PDU and the uplink grant and HARQ information of the TB to the identified HARQ process; instruct the identified HARQ process to trigger a new transmission of which a new data indicator (NDI) bit for the HARQ process is considered as having been toggled, to autonomously retransmit the MAC PDU obtained from the HARQ buffer.
  15. 15 . The device of claim 14 , wherein when the HARQ process is configured with a configured grant timer, the HARQ entity is further configured to: start or restart the configured grant timer when at least one of following conditions is satisfied: the MAC entity is configured with priority based prioritization and the uplink grant is a de-prioritized configured grant; or the MAC entity is configured with priority based prioritization, the uplink grant is a configured uplink grant and the uplink grant is a deprioritized uplink grant.
  16. 16 . The device of claim 14 , wherein when the HARQ process is configured with a configured grant timer, the HARQ entity is configured to start or restart the configured grant timer when the MAC entity determines that the transmission is performed.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is a continuation application of International Application No. PCT/CN2020/130826, filed on Nov. 23, 2020, which claims the priority of US provisional application U.S. 62/938,922, filed on Nov. 21, 2019. The present application claims priority and the benefit of the above-identified applications and the above-identified applications are incorporated by reference herein in their entireties. TECHNICAL FIELD The present application relates to the field of communication technology, and in particular, to a method and device for transmitting a medium access control (MAC) protocol data unit (PDU). BACKGROUND In order to satisfy the increasingly higher requirement for communication in various aspects, a fifth generation (5G) New Radio (NR) wireless communication system has been developed. A Hybrid Automatic Repeat reQuest (HARQ) mechanism is generally applied in a packet data transmission system to improve reliability of data transmission. Particularly, a HARQ process of a MAC layer of a receiving end feeds back an acknowledgement (ACK) to that of a sending end if a MAC PDU from the sending end is successfully received at the receiving end, and feeds back a negative acknowledgement (NACK) to that of the sending end if the MAC PDU is not successfully received, so that a retransmission of the MAC PDU can be performed. The HARQ mechanism is also applied in the NR communication system, and there is a need for further improvement in methods for transmitting MAC PDUs by utilizing the HARQ mechanism in the NR communication system. SUMMARY Implementations of the present disclosure provide a method and device for transmitting a medium access control (MAC) protocol data unit (PDU). In a first aspect, a method for transmitting a MAC PDU is provided. The method includes: identifying, by a hybrid automatic repeat request (HARQ) entity, for an uplink grant, a HARQ process associated with the uplink grant; and obtaining, by the HARQ entity, a MAC PDU to transmit from a HARQ buffer of the identified HARQ process when at least one of following conditions is satisfied: a MAC entity of the HARQ entity is configured with priority based prioritization, the uplink grant is a configured grant, and a previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process; the uplink grant is a configured grant, the previous uplink grant for the HARQ process was de-prioritized and the MAC PDU had already been obtained for the HARQ process, a previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer had not been successfully transmitted due to overlapping of a physical uplink shared channel (PUSCH) duration of the previous uplink grant with a PUSCH duration of another uplink grant; or the MAC entity is configured with priority based prioritization, the previous configured grant for the identified HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer had not been successfully transmitted due to the overlapping. In a second aspect, a method for transmitting a MAC PDU is provided. The method includes: delivering, by a MAC entity, a configured uplink grant and associated HARQ information to a HARQ entity of the MAC entity when at least one of following conditions is satisfied: a previous uplink grant delivered to the HARQ entity for a same HARQ process was a configured uplink grant which was de-prioritized; a MAC PDU obtained in a HARQ buffer of the HARQ process had not been successfully transmitted due to overlapping of a PUSCH duration of the previous uplink grant with a PUSCH duration of another uplink grant; the previous configured grant for the HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; the MAC entity is configured with priority based prioritization and the previous uplink grant delivered to the HARQ entity for the same HARQ process was a configured uplink grant which was de-prioritized; the MAC entity is configured with priority based prioritization and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; or the MAC entity is configured with priority based prioritization and the previous configured grant for the HARQ process was de-prioritized and the MAC PDU obtained in the HARQ buffer of the HARQ process had not been successfully transmitted due to the overlapping; delivering, by the HARQ entity, the uplink grant and the HARQ information of a transport block (TB) to the HARQ process; and instructing, by the HARQ entity, the HARQ process to trigger a retransmission. In a third aspect, a device for transmitting a MAC PDU is provided. The device includes a HARQ entity configured to: identify, for an uplink grant, a HARQ process associated with the uplink grant; a