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US-12621906-B2 - Packet data convergence protocol status reporting method, packet data convergence protocol status receiving method, terminal and device

US12621906B2US 12621906 B2US12621906 B2US 12621906B2US-12621906-B2

Abstract

Disclosed are a packet data convergence protocol status reporting method, a packet data convergence protocol status receiving method, a terminal and devices. The method at the terminal side includes: in case of receiving the MBS, triggering to report a packet data convergence protocol (PDCP) status according to a preset condition; transmitting a PDCP status report on a predetermined uplink channel.

Inventors

  • Li Chen

Assignees

  • DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.

Dates

Publication Date
20260505
Application Date
20210916
Priority Date
20201023

Claims (15)

  1. 1 . A packet data convergence protocol (PDCP) status reporting method, performed by a terminal, comprising: in case of receiving multicast and broadcast services (MBS), triggering to report a PDCP status according to a preset condition; transmitting a PDCP status report on a predetermined uplink channel; wherein the preset condition includes at least one of the following: the terminal receives a PDCP status report poll transmitted by a network side; when the terminal undergoes cell handover; or, the terminal receives an MBS service bearer reconfiguration message; wherein the reconfiguration message carries a data recovery indication, and the reconfiguration message includes reconfiguration from multicast point-to-multipoint (PTM) transmission to unicast point-to-point (PTP) transmission, or MBS Radio Bearer (MRB) reconfiguration for multicast PTM transmission.
  2. 2 . The method according to claim 1 , wherein the terminal receiving the PDCP status report poll transmitted by the network side, includes one of the following: receiving a PDCP protocol data unit (PDU) transmitted by the network side on a multicast downlink channel, and obtaining a poll bit from the PDCP PDU; or, receiving a PDCP PDU transmitted by the network side on a unicast downlink channel, and obtaining a poll bit from the PDCP PDU.
  3. 3 . The method according to claim 2 , wherein the PDCP status report poll transmitted to the terminal on the unicast downlink channel, includes: PDCP status report poll for multicast PTM transmission; or, PDCP status report poll for unicast PTP transmission; or, all PDCP status report poll for multicast PTM transmissions and unicast PTP transmissions.
  4. 4 . The method according to claim 1 , wherein the predetermined uplink channel includes at least one of the following: an uplink RLC AM channel corresponding to a downlink RLC AM on a network side in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) acknowledged mode (AM); an uplink RLC UM channel corresponding to a downlink RLC UM on the network side in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) unacknowledged mode (UM); or, in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) unacknowledged mode (UM), for the MBS service, when multicast PTM and unicast PTP transmission modes are simultaneously configured for the terminal, an uplink RLC UM channel of PTP transmission mode.
  5. 5 . The method according to claim 1 , wherein the PDCP status report includes: a sequence number of an unsuccessfully received PDCP PDU.
  6. 6 . The method according to claim 1 , wherein the method further includes: receiving retransmission of PDCP PDU transmitted by the network side on a multicast PTM transmission channel of MRB; or, receiving retransmission of PDCP PDU transmitted by the network side on a unicast PTP transmission channel of the MRB.
  7. 7 . A packet data convergence protocol (PDCP) status receiving method, performed by a network side, comprising: receiving a PDCP status report reported by a terminal according to a preset condition when the terminal receives multicast and broadcast services (MBS); wherein the PDCP status report is transmitted on a predetermined uplink channel; transmitting retransmission of PDCP protocol data unit (PDU) to the terminal; wherein the preset condition includes at least one of the following: the network side transmits a PDCP status report poll; when the terminal undergoes cell handover; or, the network side configures MBS service bearer reconfiguration message; wherein the reconfiguration message carries a data recovery indication, and the reconfiguration message includes reconfiguration from multicast point-to-multipoint (PTM) transmission to unicast point-to-point (PTP) transmission, or MBS Radio Bearer (MRB) reconfiguration for multicast PTM transmission.
  8. 8 . The method according to claim 7 , wherein the network side transmitting the PDCP status report poll, includes one of the following: transmitting, by the network side, PDCP PDU on a multicast downlink channel, wherein the PDCP PDUs include a polling bit; transmitting, by the network side, the PDCP status report poll to the terminal on a unicast downlink channel, wherein the PDCP PDU includes a polling bit.
  9. 9 . The method according to claim 8 , wherein the PDCP status report poll transmitted to the terminal on the unicast downlink channel, includes: PDCP status report poll for multicast PTM transmission; or, PDCP status report poll for unicast PTP transmission; or, all PDCP status report poll for multicast PTM transmissions and unicast PTP transmissions.
  10. 10 . The method according to claim 7 , wherein the predetermined uplink channel includes at least one of the following: an uplink RLC AM channel corresponding to a downlink RLC AM on the network side in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) acknowledged mode (AM); an uplink RLC UM channel corresponding to a downlink RLC UM on the network side in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) unacknowledged mode (UM); or, in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) unacknowledged mode (UM), for the MBS service, when multicast PTM and unicast PTP transmission modes are simultaneously configured for the terminal, an uplink RLC UM channel of PTP transmission mode.
  11. 11 . The method according to claim 7 , wherein the PDCP status report includes: a sequence number of an unsuccessfully received PDCP PDU.
  12. 12 . The method according to claim 7 , wherein the transmitting retransmission of PDCP PDU to the terminal, includes: transmitting retransmission of PDCP PDU through a multicast PTM transmission channel of the MRB; or, transmitting retransmission of PDCP PDU on a unicast PTP transmission channel of MRB, in the case that the MBS service is simultaneously mapped to multicast PTM and unicast PTP transmission.
  13. 13 . A terminal, comprising: a transceiver, a processor and a memory; wherein the memory stores a program executable by the processor, and the processor executes the program to perform: in case of receiving multicast and broadcast services (MBS), triggering to report a packet data convergence protocol (PDCP) status according to a preset condition; transmitting a PDCP status report on a predetermined uplink channel; wherein the preset condition includes at least one of the following: the terminal receives a PDCP status report poll transmitted by a network side; when the terminal undergoes cell handover; or, the terminal receives an MBS service bearer reconfiguration message; wherein the reconfiguration message carries a data recovery indication, and the reconfiguration message includes reconfiguration from multicast point-to-multipoint (PTM) transmission to unicast point-to-point (PTP) transmission, or MBS Radio Bearer (MRB) reconfiguration for multicast PTM transmission.
  14. 14 . A network device for performing the method according to claim 8 , comprising: a transceiver, a processor and a memory; wherein the memory stores a program executable by the processor, and the processor executes the program to perform: receiving a packet data convergence protocol (PDCP) status report reported by a terminal according to a preset condition when the terminal receives multicast and broadcast services (MBS), wherein the PDCP status report is transmitted on a predetermined uplink channel; transmitting retransmission of PDCP protocol data unit (PDU) to the terminal; wherein the preset condition includes at least one of the following: the network side transmits a PDCP status report poll; when the terminal undergoes cell handover; or, the network side configures MBS service bearer reconfiguration message; wherein the reconfiguration message carries a data recovery indication, and the reconfiguration message includes reconfiguration from multicast point-to-multipoint (PTM) transmission to unicast point-to-point (PTP) transmission, or MBS Radio Bearer (MRB) reconfiguration for multicast PTM transmission.
  15. 15 . A non-transitory processor-readable storage medium, comprising processor-executable instructions stored thereon; wherein the processor-executable instructions are configured to cause a processor to perform the method according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is the U.S. national phase of PCT Application PCT/CN2021/118769 filed on Sep. 16. 2021, which claims the priority of priority to the Chinese Application No. 202011144474.5, filed on Oct. 23, 2020, the disclosure of which is incorporated in its entirety by reference herein. the disclosures of which are incorporated in their entireties by reference herein. TECHNICAL FIELD The present disclosure relates to the field of communication technologies, and in particular to a packet data convergence protocol status reporting method, a packet data convergence protocol status receiving method, a terminal and devices. BACKGROUND Multimedia broadcast multicast service (MBMS) services have existed for a long time in the 3G and 4G technologies. Due to requirements of multicast and broadcast services, MBMS services are introduced in the 5G technology, and are referred as multicast and broadcast services (MBS) in 5G. 5G MBS services are transmitted independently in each cell. A service that needs to perform broadcast multicast transmission is mapped to broadcast and multicast channels and transmitted to multiple terminals, which may be referred to as point-to-multipoint (PTM) transmission. One terminal can be configured with both PTM and point to point (PTP) transmissions, as shown in FIG. 1. In order to ensure reliability of data transmission, there are various retransmission mechanisms in unicast transmission. The basis of the unicast retransmission mechanism is that transmission channels and feedback channels are in one-to-one correspondence between a base station and a terminal, and different terminals have their own independent transmission channels and feedback channels. PTM is point-to-multipoint transmission, and multiple terminals receive the same PDCP PDU, but in related art, it is impossible to ensure that each terminal successfully receives the PDCP PDU. Meanwhile, for multicast transmission, in the related art, there is no feedback channel available for the point-to-multipoint channel. SUMMARY The present disclosure provides a packet data convergence protocol status reporting method, a packet data convergence protocol status receiving method, a terminal and devices, which can realize reliable transmission of MBS services transmitted in PTM at a PDCP layer. In order to solve the above technical problems, the technical solutions provided in embodiments of the present disclosure are as follows. A packet data convergence protocol (PDCP) status reporting method, performed by a terminal which receives multicast and broadcast services (MBS) transmission, including: in case of receiving the MBS, triggering to report a packet data convergence protocol (PDCP) status according to a preset condition;transmitting a PDCP status report on a predetermined uplink channel. Optionally, the preset condition includes at least one of the following: when the terminal counts the number of packet data convergence protocol (PDCP) packet data unit (PDU) packet loss, and determines that the number of PDCP PDU packet loss reaches a preset threshold;the terminal receives a PDCP status report poll transmitted by a network side;when the terminal undergoes cell handover; or,the terminal receives an MBS service bearer reconfiguration message; wherein the reconfiguration message carries a data recovery indication, and the reconfiguration message includes reconfiguration from multicast PTM transmission to unicast PTP transmission, or MRB reconfiguration for multicast PTM transmission. Optionally, the terminal receiving the PDCP status report poll transmitted by the network side, includes one of the following: receiving a PDCP PDU transmitted by the network side on a multicast downlink channel, and obtaining a poll bit from the PDCP PDU; or,receiving a PDCP PDU transmitted by the network side on a unicast downlink channel, and obtaining a poll bit from the PDCP PDU. Optionally, the PDCP status report poll transmitted to the terminal on the unicast downlink channel, includes: PDCP status report poll for multicast PTM transmission; or,PDCP status report poll for unicast PTP transmission; or,all PDCP status report poll for multicast PTM transmissions and unicast PTP transmissions. Optionally, the predetermined uplink channel includes at least one of the following: an uplink RLC AM channel corresponding to a downlink RLC AM on a network side in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) acknowledged mode (AM);an uplink RLC UM channel corresponding to a downlink RLC UM on the network side in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) unacknowledged mode (UM); or,in case that a downlink bearer of multicast PTM transmission is configured as radio link control (RLC) unacknowledged mode (UM), for the MBS service, when multicast PTM and unicast PTP transmission modes are simultaneously conf