Scheduling apparatus and scheduling method
A scheduling apparatus and a scheduling method, wherein the amount of signaling for frequency resource allocation information can be reduced while maintaining system throughput performance. In a base station apparatus ( 100 ), a scheduling section ( 113 ) allocates frequency resources to frequency allocation target terminals based on set frequency allocation units, and a frequency allocation parameter setting section ( 112 ) adjusts the set frequency allocation units set in the scheduling section ( 113 ) based on cluster numbers. Due to this, in each cluster number, frequency resources can be allocated based on the most suitable frequency allocation units with respect to the signaling bit number. As a result, the amount of signaling for frequency resource allocation information can be reduced. Further, system throughput can be maintained by making the cluster number, which is a parameter having little effect on system throughput, a setting parameter for frequency allocation units.
1. A communication apparatus, comprising:
a receiver which, in operation, receives control information that includes cluster information that specifies a number of clusters which is a number of frequency resources allocated to a user equipment, each cluster being located on a separate position from other cluster(s) on a frequency axis; and
a mapper which, in operation, sets a resource block group size for allocating one or more frequency resources according to both a system bandwidth and the number of clusters, wherein the resource block group size is a number of resource blocks included in a resource block group, each of the clusters comprising one or more resource block groups of the resource group size, and maps data to the one or more frequency resources, in one or more units of the resource block size.
2. The communication apparatus according to claim 1 wherein a common signaling format is used for both continuous frequency resource allocation where the number of clusters is one, and non-continuous frequency resource allocation where the number of clusters is two or more.
3. The communication apparatus according to claim 2 wherein the common signaling format includes a type bit indicative of the number of clusters and allocation information indicative of the frequency resource allocation.
4. The communication apparatus according to claim 3 wherein the allocation information has N bits calculated according to a following equation:
N =┌log 2 ((┌ N RB /P┐+ 1) C (2 N Cluster ))┐
wherein, N RB is the system bandwidth, P is the resource block group size, N Cluster is the number of clusters, and C means a number of combinations of selecting 2*N CLuster cluster starting and ending positions out of ┌N RB /P┐+1 number of possible cluster starting and ending positions, and ┌ ┐ represents a ceiling function.
5. The communication apparatus according to claim 3 wherein the type bit is indicative of a restricted number of clusters.
6. The communication apparatus according to claim 1 wherein a total number of bits in a signaling format used for continuous frequency resource allocation where the number of clusters is one is equal to a total number of bits in a signaling format used for non-continuous frequency resource allocation where the number of clusters is two or more.
7. The communication apparatus according to claim 1 wherein the resource block group size is set to a larger number as the number of clusters grows larger.
8. A communication method, comprising:
receiving control information that includes cluster information that specifies a number of clusters which is a number of frequency resources allocated to a user equipment, each cluster being located on a separate position from other cluster(s) on a frequency axis;
setting a resource block group size for allocating one or more frequency resources according to both a system bandwidth and the number of clusters, wherein the resource block group size is a number of resource blocks included in a resource block group, each of the clusters comprising one or more resource block groups of the resource group size; and
mapping data to the one or more frequency resources, in one or more units of the resource block size.
9. The communication method according to claim 8 wherein a common signaling format is used for both continuous frequency resource allocation where the number of clusters is one, and non-continuous frequency resource allocation where the number of clusters is two or more.
10. The communication method according to claim 9 wherein the common signaling format includes a type bit indicative of the number of clusters and allocation information indicative of the frequency resource allocation.
11. The communication method according to claim 10 wherein the allocation information has N bits calculated according to a following equation:
N =┌log 2 ((┌ N RB /P┐+ 1) C (2 N Cluster ))┐
wherein, N RB is the system bandwidth, P is the resource block group size, N Cluster is the number of clusters, and C means a number of combinations of selecting 2*N Cluster cluster starting and ending positions out of ┌N RB /P┐+1 number of possible cluster starting and ending positions, and ┌ ┐ represents a ceiling function.
12. The communication method according to claim 10 wherein the type bit is indicative of a restricted number of clusters.
13. The communication method according to claim 8 wherein a total number of bits in a signaling format used for continuous frequency resource allocation where the number of clusters is one is equal to a total number of bits in a signaling format used for non-continuous frequency resource allocation where the number of clusters is two or more.
14. The communication method according to claim 8 wherein the resource block group size is set to a larger number as the number of clusters grows larger.