A mobile communication system comprising: a base station including a transmitter that provides wireless coverage in a cell, said cell being divided into a center region and a boundary region, said center region being surrounded by said boundary region, an outer edge of said boundary region defining an outer edge of said cell, said transmitter transmitting using first wireless resources allocated to the center region and second wireless resources allocated to the boundary region; and a relay node being configured to relay signals between said base station and a mobile station and including a controller that operates the relay node in one of a plurality of relay modes that are distinguished based on position information of the mobile station and position information of the relay node relative to the boundary region and the center region, each of the plurality of relay modes having predetermined wireless resource assignments for communications between the base station and relay node, and between the relay node and mobile station; said controller sets the relay mode to be one of a first relay mode when the relay node is in the center region and said mobile station is in the boundary region, a second relay mode when both the relay node and the mobile station are in the boundary region, or a third relay mode when both the relay node and the mobile station are in the center region, wherein the first relay mode of the plurality of relay modes specifies combined time division and frequency division multiple wireless resource access in which each of an uplink channel and a downlink channel employ mutually exclusive frequency bands, and the second relay mode and the third relay mode of the plurality of relay modes employ mutually exclusive frequency bands. a base station including a transmitter that provides wireless coverage in a cell, said cell being divided into a center region and a boundary region, said center region being surrounded by said boundary region, an outer edge of said boundary region defining an outer edge of said cell, said transmitter transmitting using first wireless resources allocated to the center region and second wireless resources allocated to the boundary region; and a relay node being configured to relay signals between said base station and a mobile station and including a controller that operates the relay node in one of a plurality of relay modes that are distinguished based on position information of the mobile station and position information of the relay node relative to the boundary region and the center region, each of the plurality of relay modes having predetermined wireless resource assignments for communications between the base station and relay node, and between the relay node and mobile station; said controller sets the relay mode to be one of a first relay mode when the relay node is in the center region and said mobile station is in the boundary region, a second relay mode when both the relay node and the mobile station are in the boundary region, or a third relay mode when both the relay node and the mobile station are in the center region, wherein the first relay mode of the plurality of relay modes specifies combined time division and frequency division multiple wireless resource access in which each of an uplink channel and a downlink channel employ mutually exclusive frequency bands, and the second relay mode and the third relay mode of the plurality of relay modes employ mutually exclusive frequency bands. a controller that operates the relay node in one of a plurality of relay modes that are distinguished based on position information of the mobile station and position information of the relay node relative to the boundary region and the center region, each of the plurality of relay modes having predetermined wireless resource assignments for communications between the base station and relay node, and between the relay node and mobile station; said controller sets the relay mode to be one of a first relay mode when the relay node is in the center region and said mobile station is in the boundary region, a second relay mode when both the relay node and the mobile station are in the boundary region, or a third relay mode when both the relay node and the mobile station are in the center region, wherein the first relay mode of the plurality of relay modes specifies combined time division and frequency division multiple wireless resource access in which each of an uplink channel and a downlink channel employ mutually exclusive frequency bands, and the second relay mode and the third relay mode of the plurality of relay modes employ mutually exclusive frequency bands.