Cooperative pilot power control in relay based cellular network

Relay based cellular network (RBCN) is a kind of hybrid cellular network working under OFDMA technology. It is a promising network to support high transmitting data-rate, throughput, capacity, flexibility and resource efficiency. Normally QoS offered to mobile user (MS) is improved in RBCN by using relay station (RS) to enhance Base station (BS) radio coverage. But in reality, QoS is affected by service congestion problem caused by MS un-balance distribution and limited capacity and mobility of BS and RS. So this paper introduces an algorithm to cooperatively control the pilot power at the BSs and RSs of a RBCN for geography load balance to release this service congestion problem. The performance of the algorithm is evaluated using a WiMAX simulator and the results are compared to a state of art greedy algorithm in literature and the conventional RBCN.