Base station apparatus and communication control method

1. A base station apparatus capable of communicating with a plurality of user equipment terminals using a shared channel, the base station apparatus comprising:

a selection unit configured to select user equipment terminals to which radio resources are allocated based on priority levels indicating a priority order of allocating the radio resources for the shared channel; and

a resource determination unit configured to determine a transmission power of a control channel and resources for the control channel, the control channel indicating communications of the shared channel to the selected user equipment terminals, wherein

when a sum of the transmission power of the control channel related to the selected user equipment terminals exceeds a predetermined first threshold value or when a sum of control resources for the control channel related to the selected user equipment terminals exceeds a predetermined second threshold value, the resource determination unit transmits the control channel to some user equipment terminals among the selected user equipment terminals.

2. The base station apparatus according to claim 1 , wherein

the resource determination unit preferentially transmits the control channel to a user equipment terminal having retransmission data.

3. The base station apparatus according to claim 1 , wherein

the resource determination unit preferentially transmits the control channel to a user equipment terminal having data of a higher priority level.

4. The base station apparatus according to claim 1 , wherein

the resource determination unit preferentially transmits the control channel for a common channel.

5. The base station apparatus according to claim 1 , wherein

when the sum of the transmission power of the control channel related to the selected user equipment terminals exceeds a predetermined threshold value, the resource determination unit decreases the transmission power of the control channel so that the sum of the transmission power of the control channel is equal to the predetermined first threshold value.

6. The base station apparatus according to claim 5 , wherein

the resource determination unit does not decrease a transmission power of at least one of a downlink reference signal, a control channel to be transmitted to a user equipment terminal having retransmission data, a control channel to be transmitted to a user equipment terminal having data of a higher priority level, and a control channel for a common channel.

7. A communication control method employed in a base station apparatus capable of communicating with a plurality of user equipment terminals using a shared channel, the method comprising:

a first selection step of selecting user equipment terminals to which radio resources are allocated based on priority levels indicating a priority order of allocating the radio resources for the shared channel;

a determination step of determining a transmission power of a control channel and resources for the control channel, the control channel indicating communications of the shared channel to the selected user equipment terminals;

a second selection step of selecting user equipment terminals to which the radio resources are allocated based on the priority levels indicating the priority order of allocating the radio resources; and

a transmission power control step of controlling a transmission power of the control channel to the selected user equipment terminals, wherein

in the determination step, when a sum of the transmission power of the control channel related to the selected user equipment terminals exceeds a predetermined first threshold value or when a sum of control resources for the control channel related to the selected user equipment terminals exceeds a predetermined second threshold value, the control channel is transmitted to some user equipment terminals among the selected user equipment terminals.