Random access transmit power control algorithm of LTE system in relay network

Random access process of LTE (long term evolution) system is carried out exploiting the superior correlation property of random access code. Each user unit transmits randomly selected random access code, and the Node B (base station) detects each code by correlating the received signal with all possible random access codes. By comparing the correlation output power to the threshold, randomly selected codes are identified. This paper considers random access process of LTE system in relay network. A problem caused by the introduction of relay network is addressed, and a solution is provided. The proposed solution includes the power control strategy for both downlink broadcast signal and uplink random access signal. Simulation results show that the addressed problem is overcome by the proposed power control algorithm while the backward compatibility is maintained.