MBS data transmission method, base station, MBS data receiving method, and user equipment
The present invention relates to a method and apparatus for signaling, to user equipment, the number and position of frequency resources allocated to each of the plurality of E-MBS zones, using a zone allocation bitmap including bits corresponding to the number of resources allocated for one or more E-MBS zones. The method and apparatus of the present invention are advantageous in that signaling overheads required for specifying the number and position of frequency resources allocated to each of E-MBS zones can be reduced.
1. A method of transmitting, by a base station, MBS (multicast and broadcast service) data in a wireless communication system, comprising:
transmitting an allocation bitmap for indicating subbands allocated to one or more MBS zones from among a plurality of subbands included in a downlink frequency band;
transmitting the MBS data via at least one subband allocated to the one or more MBS zones,
wherein the subbands allocated to the one or more MBS zones are subbands having lowest indexes from among the plurality of subbands; and
wherein the allocation bitmap includes a plurality of bits, each of which corresponds to two adjacent subbands in the plurality of subbands and indicates whether the two adjacent subbands belong to a same MBS zone.
2. The method of claim 1 , wherein the rest of the plurality of subbands except the subbands allocated to the one or more MBS zones is allocated to a unicast zone for unicast data.
3. The method of claim 2 , wherein in the allocation bitmap, a bit corresponding to two adjacent subbands allocated to different MBS zones or corresponding to a last subband of the subbands allocated to the one or more MBS zones is set to a 1 st value and a bit corresponding to two adjacent subbands allocated to one MBS zone or corresponding to two adjacent subbands allocated to the unicast zone is set to a 2 nd value.
4. The method of claim 3 , wherein the number of bits set to the 1 st value in the allocation bitmap is equal to the number of the MBS zones.
5. The method of claim 3 , wherein the number of bits set to the 1 st value in the allocation bitmap is smaller by one than a sum of the number of the one or more MBS zones and the number of unicast zone and wherein the base station further transmits information indicating a boundary between the one or more MBS zones and the unicast zone or information indicating the number of the one or more MBS zones.
6. A method of receiving, by a user equipment, MBS (multicast and broadcast service) data in a wireless communication system, comprising:
receiving, from a base station, an allocation bitmap for indicating subbands allocated to one or more MBS zones from among a plurality of subbands included in a downlink frequency band;
receiving, from the base station, the MBS data via at least one subband allocated to the one or more MBS zones based on the allocation bitmap,
wherein the subbands allocated to the one or more MBS zones are subbands having lowest indexes from among the plurality of subbands; and
wherein the allocation bitmap includes a plurality of bits, each of which corresponds to two adjacent subbands in the plurality of subbands and indicates whether the two adjacent subbands belong to a same MBS zone.
7. The method of claim 6 , wherein unicast data is received on the rest of the plurality of subbands except the n-subbands allocated to the one or more MBS zones.
8. The method of claim 7 , wherein a bit set to a 1 st value in the allocation map indicates two adjacent subbands allocated to different MBS zones or a last subband of then subbands allocated to the one or more MBS zones and wherein a bit set to a 2 nd value indicates two adjacent subbands allocated to one MBS zone or two adjacent subbands allocated to the unicast data.
9. The method of claim 8 , wherein the number of bits set to the 1 st value in the allocation bitmap is equal to the number of the one or more MBS zones.
10. The method of claim 8 , wherein the number of bits set to the 1 st value in the allocation bitmap is smaller by one than a sum of the number of the one or more MBS zones and the number of unicast zone for the unicast data and wherein the user equipment further receives information indicating a boundary between the one or more MBS zones and the unicast zone or information indicating the number of the one or more MBS zone.
11. A base station of transmitting MBS (multicast and broadcast service) data in a wireless communication system, comprising:
a transmitter; and
a processor, connected to the transmitter, configured to control the transmitter to transmit an allocation bitmap for indicating subbands allocated to one or more MBS zones from among plurality of subbands included in a downlink frequency band and configured to control the transmitter to transmit the MBS data via at least one subband allocated to the one or more MBS zones,
wherein the subbands allocated to the one or more MBS zones are subbands having lowest indexes from among the plurality of subbands; and
wherein the allocation bitmap includes a plurality of bits, each of which corresponds to two adjacent subbands in the plurality of subbands and indicates whether the two adjacent subbands belong to a same MBS zone.
12. The base station of claim 11 , wherein the processor controls the transmitter to transmit unicast data via the rest of the plurality of subbands except the n-subbands allocated to the one or more MBS zones.
13. The base station of claim 12 , wherein the processor is configured to set a bit corresponding to two adjacent subbands allocated to different MBS zones or corresponding to a last subband of the subbands allocated to the one or more MBS zones to a 1 st value and wherein the processor is configured to set a bit corresponding to two adjacent subbands allocated to one MBS zone or corresponding to two adjacent subbands allocated to the unicast data to a 2 nd value.
14. The base station of claim 13 , wherein the processor is configured to set a last bit of the allocation bitmap to the 1 st value such that the number of bits set to the 1 st value in the allocation bitmap is equal to the number of the one or more MBS zones.
15. The base station of claim 13 , wherein the processor is configured to set a bit corresponding between two MBS zones or between the one or more MBS zones and a unicast zone for the unicast data to the 1 st value such that the number of bits set to the 1 st value in the allocation bitmap is smaller by one than a sum of the number of the one or more MBS zones and the number of the unicast zone and wherein the processor controls the transmitter to further transmit information indicating a boundary between the one or more MBS zones and the unicast zone or information indicating the number of the one or more MBS zones.
16. A user equipment of receiving MBS (multicast and broadcast service) data in a wireless communication system, comprising:
a receiver; and
a processor, connected to the receiver, configured to control the receiver to receive, from a base station, an allocation bitmap for indicating subbands allocated to one or more MBS zones from among a plurality of subbands included in a downlink frequency band, control the receiver to receive, from the base station, the MBS data via at least one subband allocated to the one or more MBS zones based on the allocation bitmap,
wherein the subbands allocated to the one or more MBS zones are subbands having lowest indexes from among the plurality of subbands; and
wherein the allocation bitmap includes a plurality of bits, each of which corresponds to two adjacent subbands in the plurality of subbands and indicates whether the two adjacent subbands belong to a same MBS zone.
17. The user equipment of claim 16 , wherein the processor control the receiver to receive unicast data on the rest of the plurality of subbands except the subbands allocated to the one or more MBS zones.
18. The user equipment of claim 17 , wherein the processor determines that a bit set to a 1 st value in the allocation map indicates two adjacent subbands allocated to different MBS zones or a last subband of the subbands allocated to the one or more MBS zones and wherein the processor determines that a bit set to a 2 nd value indicates two adjacent subbands allocated to one MBS zone or two adjacent subbands allocated to the unicast data.
19. The user equipment of claim 18 , wherein the processor determines the number of the one or more MBS zones based on the number of the bits set to the 1 st value in the allocation bitmap and wherein the number of the bits set to the 1 st value in the allocation bitmap is equal to the number of the one or more MBS zones.
20. The user equipment of claim 18 , wherein the receiver further receives information indicating a boundary between the one or more MBS zones and a unicast zone for the unicast data or information indicating the number of the one or more MBS zones, wherein the processor determines the number of the one or more MBS zones based on the information indicating the boundary or the information indicating the number of the one or more MBS zones and the number of the bits set to the 1st value in the allocation bitmap, and wherein the number of the bits set to the 1st value is smaller by one than a sum of the number of the one or more MBS zones and the number of the unicast zone.