Patent ID: 8169919

Claim:
A terminal device, comprising: an order setting unit to set a test order of a plurality of relay nodes; a measurement unit to measure an output signal to noise ratio (SNR) of a leading relay node from among the plurality of relay nodes based on the test order; and a selection unit to compare the output SNR and a threshold value, and select the leading relay node as a relay node to perform a cooperative communication in response to the output SNR being greater than the threshold value, wherein the measurement unit measures an output SNR of a subsequent relay node based on the test order in response to the output SNR of the leading relay node being equal to or less than the threshold value, and the selection unit compares the output SNR of the subsequent relay node and the threshold value and selects the subsequent relay node as the relay node to perform the cooperative communication in response to the output SNR of the subsequent relay node being greater than the threshold value; and wherein in response to the relay node being selected, the remaining relay nodes are discontinued to be measured.