Communication method for improving reliability of MBS service transmission

1 . A communication method for improving reliability of MBS service transmission performed at a UE side, comprising:

receiving, on a physical downlink shared channel, transport blocks of an MBS service;

decoding the transport blocks, and according to a decoding state and a configured feedback mode, sending a feedback to a base station, wherein the configured feedback mode is an ACK/NACK mode or a NACK mode; wherein the ACK/NACK mode is that if it is decoded correctly, ACK is fed back, or otherwise NACK is fed back, the NACK mode is that if it is determined that the feedback is all the ACK, the UE does not send ACK/NACK information;

wherein the configured feedback mode is determined according to a number of UEs in a group, when the number of UEs in the group is less than a preset threshold value, the configured feedback mode is the ACK/NACK mode, and the UE uses feedback resources of independent physical uplink control channels to send the ACK or the NACK to the base station; and when the number of UEs in the group is greater than or equal to the preset threshold value, the configured feedback mode is the NACK mode, and the UE shares the same feedback resource of the physical uplink control channel to send the NACK to the base station;

wherein if the feedback sent to the base station is NACK, receiving a retransmission of all or a part of the transport block, the retransmission is performed according to a HARQ configuration and a HARQ enablement; wherein the HARQ enablement is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.

2 . The communication method according to claim 1 , wherein sending the feedback to the base station further comprises:

sending the feedback to the base station through a feedback resource of a physical uplink control channel.

3 . The communication method according to claim 2 , wherein the feedback resource of the physical uplink control channel shares the same feedback resource of the physical uplink control channel as a unicast service.

4 . The communication method according to claim 2 , wherein the feedback resource of the physical uplink control channel is configured separately, and the feedback resource of the physical uplink control channel is not shared with a unicast service.

5 . The communication method according to claim 2 , wherein the UE uses feedback resources of independent physical uplink control channels to send the ACK or the NACK to the base station.

6 . The communication method according to claim 2 , wherein the UE uses feedback resources of independent physical uplink control channels to send the NACK to the base station, or the UE shares the same feedback resource of the physical uplink control channel to send the NACK to the base station.

7 . The communication method according to claim 1 , wherein according to the configured feedback mode, sending the feedback to the base station further comprises:

a configuration of the feedback mode is determined by a number of UEs in a group, when the number of UEs in the group is less than a preset threshold value, the configuration of the feedback mode is the ACK/NACK mode; when the number of UEs in the group is greater than or equal to the preset threshold value, the configuration of the feedback mode is the NACK mode.

8 . The communication method according to claim 7 , wherein the configuration of the feedback mode is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.

9 . The communication method according to claim 1 , wherein the HARQ configuration is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.

10 . A communication method for improving reliability of MBS service transmission performed at a base station side, comprising:

sending, on a physical downlink shared channel, transport blocks of an MBS service;

receiving a feedback from the UE, wherein the feedback is formed by the UE decoding the transport blocks according to a decoding state and a configured feedback mode, the configured feedback mode is an ACK/NACK mode or a NACK mode;

wherein the ACK/NACK mode is that if it is decoded correctly, ACK is fed back, or otherwise NACK is fed back, the NACK mode is that if it is determined that the feedback is all the ACK, the UE does not send ACK/NACK information;

wherein the base station determines a configured feedback mode according to a number of UEs in a group, when the number of UEs in the group is less than a preset threshold value, the configured feedback mode is an ACK/NACK mode, and the base station configures feedback resources of independent physical uplink control channels for the UEs to respectively transmit ACKs or NACKs; and when the number of UEs in the group is greater than or equal to the preset threshold value, the configured feedback mode is a NACK mode, and the base station configures the UEs to share a same feedback resource of a physical uplink control channel for transmitting NACKs;

wherein if the feedback received by the base station is NACK, sending a retransmission of all or a part of the transport block, the retransmission is performed according to a HARQ configuration and a HARQ enablement; wherein the HARQ enablement is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.

11 . The communication method according to claim 10 , wherein receiving the feedback from the UE further comprises:

receiving the feedback from the UE through a feedback resource of a physical uplink control channel.

12 . The communication method according to claim 11 , wherein the feedback resource of the physical uplink control channel shares the same feedback resource of the physical uplink control channel as a unicast service.

13 . The communication method according to claim 11 , wherein the feedback resource of the physical uplink control channel is configured separately, and the feedback resource of the physical uplink control channel is not shared with a unicast service.

14 . The communication method according to claim 11 , wherein the base station receives the ACK or the NACK sent from the UE using feedback resources of independent physical uplink control channels.

15 . The communication method according to claim 11 , wherein the base station receives the NACK sent from the UE using feedback resources of independent physical uplink control channels, or receiving the NACK sent from the UE sharing the same feedback resource of the physical uplink control channel.

16 . The communication method according to claim 10 , wherein according to the configured feedback mode, sending the feedback to the base station further comprises:

a configuration of the feedback mode is determined by a number of UEs in a group, when the number of UEs in the group is less than a preset threshold value, the configuration of the feedback mode is the ACK/NACK mode; when the number of UEs in the group is greater than or equal to the preset threshold value, the configuration of the feedback mode is the NACK mode.

17 . The communication method according to claim 10 , wherein the configuration of the feedback mode is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.

18 . The communication method according to claim 10 , wherein the HARQ configuration is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.

19 . A user equipment, comprising a processor and a communication circuit, wherein the processor is connected to the communication circuit;

wherein the user equipment is configured to:

receive, on a physical downlink shared channel, transport blocks of an MBS service;

decode the transport blocks, and according to a decoding state and a configured feedback mode, send a feedback to a base station, wherein the configured feedback mode is an ACK/NACK mode or a NACK mode; wherein the ACK/NACK mode is that if it is decoded correctly, ACK is fed back, or otherwise NACK is fed back, the NACK mode is that if it is determined that the feedback is all the ACK, the user equipment does not send ACK/NACK information;

wherein the configured feedback mode is determined according to a number of UEs in a group, when the number of UEs in the group is less than a preset threshold value, the configured feedback mode is the ACK/NACK mode, and the UE uses feedback resources of independent physical uplink control channels to send the ACK or the NACK to the base station; and when the number of UEs in the group is greater than or equal to the preset threshold value, the configured feedback mode is the NACK mode, and the UE shares the same feedback resource of the physical uplink control channel to send the NACK to the base station;

wherein the ACK/NACK mode is that if it is decoded correctly, ACK is fed back, or otherwise NACK is fed back, the NACK mode is that if it is determined that the feedback is all the ACK, the UE does not send ACK/NACK information; wherein if the feedback sent to the base station is NACK, receiving a retransmission of all or a part of the transport block, the retransmission is performed according to a HARQ configuration and a HARQ enablement; wherein the HARQ enablement is configured by adding an information element through a radio resource control, configured by adding a logical channel identifier through a control element of a media access control, or configured through an indication field in a downlink control information.