Communication control method

1. A communication control method using a relay apparatus configured to relay uplink data transmitted from user equipment to a donor base station in a mobile communication system, the communication control method comprising:

receiving, by the relay apparatus, a first scheduling request of requesting allocation of an uplink radio resource to a lower apparatus from the lower apparatus;

after the relay apparatus receiving the first scheduling request from the lower apparatus, allocating, by the relay apparatus, the uplink radio resource to the lower apparatus, and

after the relay apparatus allocating the uplink radio resource to the lower apparatus, transmitting, by the relay apparatus, a second scheduling request of requesting allocation of uplink radio resource to the relay apparatus to an upper apparatus before receiving the uplink data from the lower apparatus, wherein

the lower apparatus is the user equipment, or a lower relay apparatus being interposed between the user equipment and the relay apparatus, and

the upper apparatus is the donor base station, or an upper relay apparatus being interposed between the donor base station and the relay apparatus.

2. The communication control method according to claim 1 , further comprising

allocating, by the relay apparatus, the uplink radio resource used for transmission of a buffer status report to the lower apparatus, in response to reception of the first scheduling request, wherein

the second scheduling request is transmitted after the relay apparatus allocates the uplink radio resource to the lower apparatus.

3. A relay apparatus configured to relay uplink data transmitted from user equipment to a donor base station in a mobile communication system, the relay apparatus comprising a processor and a memory coupled to the processor, the processor configured to:

receive a first scheduling request of requesting allocation of an uplink radio resource to a lower apparatus from the lower apparatus;

after receiving the first scheduling request from the lower apparatus, allocate, the uplink radio resource to the lower apparatus; and

after allocating the uplink radio resource to the lower apparatus, transmit a second scheduling request of requesting allocation of uplink radio resource to the relay apparatus to an upper apparatus before receiving the uplink data from the lower apparatus, wherein

the lower apparatus is the user equipment, or a lower relay apparatus being interposed between the user equipment and the relay apparatus, and

the upper apparatus is the donor base station, or an upper relay apparatus being interposed between the donor base station and the relay apparatus.

4. A chipset for a relay apparatus configured to relay uplink data transmitted from user equipment to a donor base station in a mobile communication system, the chipset comprising a processor and a memory coupled to the processor, the processor configured to:

receive a first scheduling request of requesting allocation of an uplink radio resource to a lower apparatus from the lower apparatus;

after receiving the first scheduling request from the lower apparatus, allocate, the uplink radio resource to the lower apparatus; and

after allocating uplink radio resource to the lower apparatus, transmit a second scheduling request of requesting allocation of uplink radio resource to the relay apparatus to an upper apparatus before receiving the uplink data from the lower apparatus, wherein

the lower apparatus is the user equipment, or a lower relay apparatus being interposed between the user equipment and the relay apparatus, and

the upper apparatus is the donor base station, or an upper relay apparatus being interposed between the donor base station and the relay apparatus.

5. A non-transitory computer-readable medium comprising, stored thereupon, computer program instructions for execution by a relay apparatus configured to relay uplink data transmitted from user equipment to a donor base station in a mobile communication system, the computer program instructions being configured to cause the relay apparatus to execute processing of:

receiving a first scheduling request of requesting allocation of an uplink radio resource to a lower apparatus from the lower apparatus;

after receiving the first scheduling request from the lower apparatus, allocating the uplink radio resource to the lower apparatus; and

after allocating the uplink radio resource to the lower apparatus, transmitting a second scheduling request of requesting allocation of uplink radio resource to the relay apparatus to an upper apparatus before receiving the uplink data from the lower apparatus, wherein

the lower apparatus is the user equipment, or a lower relay apparatus being interposed between the user equipment and the relay apparatus, and

the upper apparatus is the donor base station, or an upper relay apparatus being interposed between the donor base station and the relay apparatus.

6. A mobile communication system comprising:

a relay apparatus configured to relay uplink data transmitted from user equipment to a donor base station, wherein

the relay apparatus is configured to:

receive a first scheduling request of requesting allocation of an uplink radio resource to a lower apparatus from the lower apparatus;

after receiving the first scheduling request from the lower apparatus, allocate the uplink radio resource to the lower apparatus, and

after the relay apparatus allocating the uplink radio resource to the lower apparatus, transmit, a second scheduling request of requesting allocation of uplink radio resource to the relay apparatus to an upper apparatus before receiving the uplink data from the lower apparatus, wherein the lower apparatus is the user equipment, or a lower relay apparatus being interposed between the user equipment and the relay apparatus, and

the upper apparatus is the donor base station, or an upper relay apparatus being interposed between the donor base station and the relay apparatus.