Method and device for multicast broadcast service acquisition
A method for MBS acquisition is provided. The method includes receiving system information from a BS; determining a first CORESET configuration and a second CORESET configuration according to the system information, the first CORESET configuration determining a first set of CORESETs scheduling at least one MCCH, the second CORESET configuration determining a second set of CORESETs scheduling a plurality of MTCHs; receiving an MCCH message on the at least one MCCH provided through a first beam of a plurality of beams associated with the BS; and determining, according to the second CORESET configuration and the MCCH message, a plurality of MBS-specific CORESET groups in the second set of CORESETs, wherein each of the plurality of MBS-specific CORESET groups corresponds to a respective MBS session and includes at least two CORESETs configured to be provided through at least two different beams of the plurality of beams. A UE using the method is also provided.
1. A method performed by a User Equipment (UE) for Multicast/Broadcast Service (MBS) acquisition, the method comprising:
receiving system information from a Base Station (BS);
determining a first Control Resource Set (CORESET) configuration and a second CORESET configuration based on the system information, the first CORESET configuration for determining a first set of CORESETs scheduling at least one Multicast Control Channel (MCCH), the second CORESET configuration for determining a second set of CORESETs scheduling a plurality of Multicast Traffic Channels (MTCHs);
receiving an MCCH message on the at least one MCCH provided through a first beam of a plurality of beams associated with the BS; and
determining based on the second CORESET configuration and the MCCH message, a plurality of MBS-specific CORESET groups in the second set of CORESETs,
wherein;
each of the plurality of MBS-specific CORESET groups corresponds to a respective MBS session and comprises at least two CORESETs configured to be provided through at least two different beams of the plurality of beams,
a first MBS-specific CORESET group of the plurality of MBS-specific CORESET groups schedules a first set of the plurality of MTCHs for receiving data associated with a first MBS session, and
a second MBS-specific CORESET group of the plurality of MBS-specific CORESET groups schedules a second set of the plurality of MTCHs for receiving data associated with a second MBS session.
2. The method of claim 1 , further comprising:
receiving the data associated with the first MBS session on a first MTCH of the first set of the plurality of MTCHs, the first MTCH being provided through a second beam of the plurality of beams; and
receiving the data associated with the second MBS session on a second MTCH of the second set of the plurality of MTCHs, the second MTCH being provided through a third beam of the plurality of beams,
wherein the first beam is different from at least one of the second beam and the third beam.
3. The method of claim 2 , wherein the first beam corresponds to a first Synchronization Signal Block (SSB) with a first index, and the second beam corresponds to a second SSB with a second index that is different from the first index.
4. The method of claim 2 , wherein the first beam corresponds to a first Synchronization Signal Block (SSB) with a first index, and the third beam corresponds to a second SSB with a second index that is the same as the first index.
5. The method of claim 1 , wherein each of the plurality of MBS-specific CORESET groups is within a respective MTCH transmission window determined from the MCCH message.
6. The method of claim 1 , wherein each of the plurality of beams corresponds to a respective Synchronization Signal Block (SSB) received from the BS within a beam-sweeping cycle.
7. A User Equipment (UE) for Multicast/Broadcast Service (MBS) acquisition, the UE comprising:
at least one non-transitory computer-readable medium storing one or more computer executable instructions; and
at least one processor coupled to the at least one non-transitory computer-readable medium and configured to execute the one or more computer-executable instructions to cause the UE:
receive system information from a Base Station (BS);
determine a first Control Resource Set (CORESET) configuration and a second CORESET configuration based on the system information, the first CORESET configuration for determining a first set of CORESETs scheduling at least one Multicast Control Channel (MCCH), the second CORESET configuration for determining a second set of CORESETs scheduling a plurality of Multicast Traffic Channels (MTCHs);
receive an MCCH message on the at least one MCCH provided through a first beam of a plurality of beams associated with the BS; and
determine, based on the second CORESET configuration and the MCCH message, a plurality of MBS-specific CORESET groups in the second set of CORESETs,
wherein:
each of the plurality of MBS-specific CORESET groups corresponds to a respective MBS session and comprises at least two CORESETs configured to be provided through at least two different beams of the plurality of beams,
a first MBS-specific CORESET group of the plurality of MBS-specific CORESET groups schedules a first set of the plurality of MTCHs for receiving data associated with a first MBS session, and
a second MBS-specific CORESET group of the plurality of MBS-specific CORESET groups schedules a second set of the plurality of MTCHs for receiving data associated with a second MBS session.
8. The UE of claim 7 , wherein the at least one processor is further configured to execute the one or more computer-executable instructions to cause the UE:
receive the data associated with the first MBS session on a first MTCH of the first set of the plurality of MTCHs, the first MTCH being provided through a second beam of the plurality of beams; and
receive, by the transmission and reception circuitry, the data associated with the second MBS session on a second MTCH of the second set of the plurality of MTCHs, the second MTCH being provided through a third beam of the plurality of beams,
wherein the first beam is different from at least one of the second beam and the third beam.
9. The UE of claim 8 , wherein the first beam corresponds to a first Synchronization Signal Block (SSB) with a first index, and the second beam corresponds to a second SSB with a second index that is different from the first index.
10. The UE of claim 8 , wherein the first beam corresponds to a first Synchronization Signal Block (SSB) with a first index, and the third beam corresponds to a second SSB with a second index that is the same as the first index.
11. The UE of claim 7 , wherein each of the plurality of MBS-specific CORESET groups is within a respective MTCH transmission window determined from the MCCH message.
12. The UE of claim 7 , wherein each of the plurality of beams corresponds to a respective Synchronization Signal Block (SSB) received from the BS within a beam-sweeping cycle.