Base station apparatus and reception processing method thereof

1. A base station apparatus that wirelessly communicates with a wireless terminal, the base station apparatus comprising:

a plurality of antenna units that form a plurality of wireless zones, converts a received signal from the wireless zone into a baseband signal, and outputs the baseband signal; and

a plurality of signal processors that are provided corresponding to the plurality of antenna units, and processes the baseband signal,

wherein the signal processor is coupled at least to a corresponding antenna unit and another antenna unit, and

the signal processor includes:

a controller that allocates a part of resources for processing a baseband signal converted by the corresponding antenna unit to processing of a baseband signal converted by the other antenna unit; and

a multi-antenna reception processor that performs multi-antenna reception processing of baseband signals converted by the corresponding antenna unit and the other antenna unit from the wireless terminal using the resources.

2. The base station apparatus according to claim 1 , wherein the multi-antenna reception processor is configured as a diversity/MIMO reception processor that performs diversity or MIMO reception processing of the received signals.

3. The base station apparatus according to claim 2 , wherein the diversity/MIMO reception processor is configured to select diversity or MIMO reception processing based on a notification signal from the wireless terminal.

4. The base station apparatus according to claim 1 , wherein the controller includes:

a determining unit that determines whether the baseband signals are signals from the wireless terminal that is located in the vicinity of a boundary between different wireless zones; and

a first setting unit that allocates a part of the resources to processing of a baseband signal converted by the other antenna unit when the determining unit determines that the baseband signals are signals from the wireless terminal that is located in the vicinity of a boundary between different wireless zones.

5. The base station apparatus according to claim 1 , further comprising a malfunction monitoring unit that monitors a malfunction occurring in any of the signal processor,

wherein the controller unit includes a second setting unit that allocates a part of the resources to processing of a baseband signal converted by the other antenna unit when the malfunction monitoring unit detects a malfunction occurring in another signal processor.

6. The base station apparatus according to claim 1 , wherein the base station apparatus is a base station apparatus in a cellular communication system, and

the antenna unit and the signal processor are provided for each sector as the wireless zone.

7. A reception processing method of a base station apparatus that wirelessly communicates with a wireless terminal, the base station apparatus including a plurality of antenna units that form a plurality of wireless zones, converts a received signal from the wireless zone into a baseband signal, and outputs the baseband signal and a plurality of signal processors that are provided corresponding to the plurality of antenna units, and processes the baseband signal, the signal processor being coupled at least to a corresponding antenna unit and another antenna unit, the reception processing method comprising:

at the signal processor,

allocating a part of resources for processing a baseband signal converted by the corresponding antenna unit to processing of a baseband signal converted by the other antenna unit; and

performing multi-antenna reception processing of the baseband signals converted by the corresponding antenna unit and the other antenna unit from the wireless terminal using the resources.

8. The reception processing method according to claim 7 , wherein the signal processor performs diversity or MIMO reception processing of the received signals.

9. The reception processing method according to claim 8 , wherein the signal processor performs diversity or MIMO reception processing based on a notification signal from the wireless terminal.

10. The reception processing method according to claim 7 , further comprising:

determining whether the baseband signals are signals from the wireless terminal that is located in the vicinity of a boundary between different wireless zones; and

allocating a part of the resources to processing of a baseband signal converted by the other antenna unit when determined that the baseband signals are signals from the wireless terminal that is located in the vicinity of a boundary between different wireless zones.

11. The reception processing method according to claim 7 , further comprising:

monitoring a malfunction occurring in any of the signal processors, and

allocating a part of the resources to processing of a baseband signal converted by the other antenna unit when a malfunction occurring in another signal processor is detected by the monitoring.

12. The reception processing method according to claim 7 , wherein the base station apparatus is a base station apparatus in a cellular communication system, and

the antenna unit and the signal processor are provided for each sector as the wireless zone.