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. <EOS>