Partial Channel State Information Based Cooperative Relaying and Partner Selection

In this paper, the issue of partial channel state information (CSI) based cooperative relaying and partner selection is discussed. First, we propose a new selection relaying scheme which switches between two fixed modes: direct transmission, and regenerative relaying cooperation. Unlike the existing scheme which employs instantaneous source-relay channel gain as criteria of the switching, we utilize only the geographical information of source, relay and destination terminals. Then, in order to apply our proposed scheme to large-scale networks, a cooperative partner selection protocol based on min-max criteria is introduced. We consider the scenario that all the nodes try to transmit packets to the same access point (AP) in a round-robin manner, and the AP tries to select a cooperative partner for each node utilizing the geographical information of nodes. Numerical simulation results show that the proposed selection relaying scheme can efficiently minimize the outage probability by properly choosing the dominant transmission mode. And our partner selection protocol based on the min-max criteria outperforms both the random partner selection strategy and the fixed non-cooperative strategy in terms of outage probability while ensuring fairness among users.