Method for improving reliability of MBS service and network device

1 . A method for improving reliability of multicast broadcast service (MBS) service, comprising:

determining, by a network device, that a transmission mode of an MBS service is: new transmission is transmitted in a point to multipoint (PTM) mode, and retransmission is transmitted in a point to point (PTP) mode; and

scheduling, by the network device, transmission of the MBS service based on the transmission mode of the MBS service, comprising:

scheduling, by the network device, new transmission of first service data in the PTM mode, wherein the first service data is service data of the MBS service; and/or

scheduling, by the network device, retransmission of the first service data in the PTP mode,

wherein scheduling, by the network device, new transmission of the first service data in the PTM mode comprises:

sending, by the network device, first downlink (DL) scheduling information scrambled by a group radio network temporary identity (G-RNTI), wherein the first DL scheduling information is used for scheduling new transmission of the first service data, and the first DL scheduling information carries a first hybrid automatic repeat request (HARQ) process identity (ID).

2 . The method of claim 1 , wherein scheduling, by the network device, retransmission of the first service data in the PTP mode comprises:

sending, by the network device, third DL scheduling information scrambled by a cell RNTI (C-RNTI), wherein the third DL scheduling information is used for scheduling retransmission of the first service data, and the third DL scheduling information carries the first HARQ process ID.

3 . The method of claim 2 , wherein a new data indication (NDI) carried in the third DL scheduling information is the same as an NDI carried in the first DL scheduling information.

4 . The method of claim 1 , wherein scheduling, by the network device, retransmission of the first service data in the PTP mode comprises:

scheduling, by the network device, retransmission of the first service data in the PTP mode to each of at least one terminal device, wherein the at least one terminal device is at least one terminal device in an MBS group.

5 . The method of claim 4 , wherein the at least one terminal device comprises:

at least one terminal device that feeds back HARQ negative acknowledgement (NACK) information regarding the first service data; and/or

at least one terminal device that does not feed back HARQ feedback information regarding the first service data.

6 . The method of claim 1 , further comprising:

scheduling, by the network device, new transmission of second service data in the PTM mode when HARQ ACK information regarding the first service data fed back by all terminal devices in an MBS group is received by the network device, wherein the second service data is data to be transmitted next to the first service data.

7 . A network device, comprising:

a transceiver;

a processor; and

a memory storing computer programs which, when executed by the processor, are operable with the processor to:

determine that a transmission mode of a multicast broadcast service (MBS) service is: new transmission is transmitted in a point to multipoint (PTM) mode, and retransmission is transmitted in a point to point (PTP) mode; and

schedule transmission of the MBS service based on the transmission mode of the MBS service, wherein the processor is configured to: schedule new transmission of first service data in the PTM mode, wherein the first service data is service data of the MBS service; and/or schedule retransmission of the first service data in the PTP mode;

wherein the processor configured to schedule new transmission of the first service data in the PTM mode is configured to:

cause the transceiver to send first downlink (DL) scheduling information scrambled by a group radio network temporary identity (G-RNTI), wherein the first DL scheduling information is used for scheduling new transmission of the first service data, and the first DL scheduling information carries a first hybrid automatic repeat request (HARQ) process identity (ID).

8 . The network device of claim 7 , wherein the transceiver is configured to:

send third DL scheduling information scrambled by a cell RNTI (C-RNTI), wherein the third DL scheduling information is used for scheduling retransmission of the first service data, and the third DL scheduling information carries the first HARQ process ID.

9 . The network device of claim 8 , wherein a new data indication (NDI) carried in the third DL scheduling information is the same as an NDI carried in the first DL scheduling information.

10 . The network device of claim 7 , wherein the processor configured to schedule retransmission of the first service data in the PTP mode is configured to:

schedule retransmission of the first service data in the PTP mode to each of at least one terminal device, wherein the at least one terminal device is at least one terminal device in an MBS group.

11 . The network device of claim 10 , wherein the at least one terminal device comprises:

at least one terminal device that feeds back HARQ negative acknowledgement (NACK) information regarding the first service data; and/or

at least one terminal device that does not feed back HARQ feedback information regarding the first service data.

12 . The network device of claim 7 , wherein the processor is further configured to:

schedule new transmission of second service data in the PTM mode when HARQ ACK information regarding the first service data fed back by all terminal devices in an MBS group is received by the network device, wherein the second service data is data to be transmitted next to the first service data.