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. An integrated circuit comprising:
control circuitry which, in operation, controls:
setting, using setting circuitry of the control circuitry, a resource block group size for allocating one or more frequency resources for a user equipment according to both a system bandwidth and a number of clusters which is a number of frequency resources allocated to the user equipment, wherein the resource block group size is a number of resource block included in a resource block group, each cluster of the number of clusters comprises one or more resource block groups of the resource block group size, and each cluster of the number of clusters is located on a separate position from other clusters of the number of clusters on a frequency axis;
allocating one or more frequency resources to the user equipment, in one or more units of the set resource block group size that is set by the setting circuitry; and
transmitting to the user equipment control information that includes cluster information that specifies the number of clusters; and
at least one output coupled to the control circuitry, which, in operation, outputs a signal.
2. The integrated circuit according to claim 1 , wherein a common signaling format is used for both continuous frequency resource allocation in a case where the number of clusters is one, and non-continuous frequency resource allocation in a case where the number of clusters is two or more.
3. The integrated circuit 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 integrated circuit 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.
5. The integrated circuit according to claim 3 , wherein the type bit is indicative of a restricted number of clusters.
6. The integrated circuit according to claim 1 , wherein a total number of bits in a signaling format used for continuous frequency resource allocation in a case 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 in a case where the number of clusters is two or more.
7. The integrated circuit according to claim 1 , wherein the resource block group size is set to a larger number as the number of clusters is larger.