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, or retransmission is transmitted in a point to point, PTP, mode; characterized in: scheduling, by the network device, new transmission of first service data in the PTM mode, comprising: 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/or scheduling, by the network device, retransmission of the first service data in the PTP mode, comprising: 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; wherein the first DL scheduling information and the third DL scheduling information each carry a first hybrid automatic repeat request, HARQ, process identity, ID, and the first HARQ process ID corresponds to the first service data. 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, or retransmission is transmitted in a point to point, PTP, mode; characterized in: scheduling, by the network device, new transmission of first service data in the PTM mode, comprising: 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/or scheduling, by the network device, retransmission of the first service data in the PTP mode, comprising: 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; wherein the first DL scheduling information and the third DL scheduling information each carry a first hybrid automatic repeat request, HARQ, process identity, ID, and the first HARQ process ID corresponds to the first service data. scheduling, by the network device, new transmission of first service data in the PTM mode, comprising: 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/or scheduling, by the network device, retransmission of the first service data in the PTP mode, comprising: 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; wherein the first DL scheduling information and the third DL scheduling information each carry a first hybrid automatic repeat request, HARQ, process identity, ID, and the first HARQ process ID corresponds to the first service data.