Method and apparatus for transmitting MBS service, and terminal device

A terminal device, comprising:

• a processor and a memory, the memory is used to store a computer program, the processor is used to invoke and run the computer program stored in the memory, to cause the terminal device to perform:
• determining a corresponding relationship between a physical downlink control channel PDCCH opportunity and a synchronization signal block SSB index, wherein the PDCCH opportunity is used to transmit an MBS PDCCH;
• and
• receiving the MBS PDCCH based on the correspondence between the PDCCH opportunity and the SSB index,
• wherein the execution causes the terminal device to:
• acquire first configuration information, wherein the first configuration information is used to determine a first time window;
• wherein, within the first time window, the PDCCH opportunity corresponding to the MBS service is numbered from 0,
• wherein, for an n-th MBS data in the first time window, an index of the PDCCH opportunity corresponding to a k-th actually transmitted SSB is:
• (n−1)*S+(k−1);
• wherein, n is a positive integer greater than or equal to 1 and less than or equal to N, k is a positive integer greater than or equal to 1 and less than or equal to S;
• S is a number of SSBs actually transmitted, and N is a number of MBS data transmitted within the first time window,
• wherein the MBS data has H repeated transmissions, and H is a positive integer;
• for an h-th repeated transmission of the n-th MBS data in the first time window, the index of the PDCCH opportunity corresponding to the k-th actually transmitted SSB is:
• (n−1)*S*H+S*(h−1)+(k−1);
• wherein, h is a positive integer greater than or equal to 1 and less than or equal to H, and
• wherein a value of N satisfies the following formula:
• N=floor (total number of PDCCH opportunities in the first time window/(S*H)), wherein floor represents a rounding down operation.

A multicast broadcast service MBS service transmission method, comprising:

• determining, by a terminal device, a corresponding relationship between a physical downlink control channel PDCCH opportunity and a synchronization signal block SSB index, wherein the PDCCH opportunity is used to transmit an MBS PDCCH;
• and
• receiving, by the terminal device, the MBS PDCCH based on the correspondence between the PDCCH opportunity and the SSB index,
• wherein the method further comprises:
• acquiring, by the terminal device, first configuration information, wherein the first configuration information is used to determine a first time window;
• wherein, within the first time window, the PDCCH opportunity corresponding to the MBS service is numbered from 0,
• wherein the method further comprises:
• receiving, by the terminal device, second configuration information or third configuration information sent by a network device, wherein the second configuration information is used to determine a PDCCH opportunity index list, the PDCCH opportunity index list comprises N PDCCH opportunity indexes, and N is a positive integer greater than 1;
• each PDCCH opportunity index in the N PDCCH opportunity indexes is used to indicate a first one PDCCH opportunity corresponding to one MBS data, and wherein the third configuration information is used to determine an MBS data interval, and the MBS data interval is used to indicate a number of PDCCH opportunities between two adjacent MBS data intervals;
• in response to receiving the second configuration information, for the MBS data, an index of the PDCCH opportunity corresponding to a k-th actually transmitted SSB is:
• index of the first PDCCH opportunity corresponding to the MBS data+(k−1);
• wherein, k is a positive integer greater than or equal to 1 and less than or equal to S;
• and S is a number of SSBs actually transmitted, and
• in response to receiving the third configuration information, for an n-th MBS data in the first time window, an index of the PDCCH opportunity corresponding to a k-th actually transmitted SSB is:
• first PDCCH opportunity index+(n−1)*MBS data interval+(k−1);
• wherein, the first PDCCH opportunity index is used to indicate a first one PDCCH opportunity corresponding to the first one MBS data in the first time window, n is a positive integer greater than or equal to 1 and less than or equal to N, and k is a positive integer greater than or equal to 1 and less than or equal to S;
• S is a number of SSBs actually transmitted, and N is a number of MBS data transmitted in the first time window.