Resource Allocation for Downlink Control Channel in LTE Systems

3GPP Long Term Evolution (LTE) is a packet based all IP wireless wideband access technology, which promise high data transmission rates with high spectrum efficiency, low latency and less costs. The efficiency of wireless wideband access system is mainly determined by the efficiency of resource allocation for downlink control channel, especially for the LTE system, which the feedback almost is fixed and simplified. It is hard to design an efficient reliable physical downlink control channels (PDCCHs) scheduling algorithm with low complexity, While the wideband wireless channel is time variable, time and/or frequency selective. In this paper, we focus on a few low complexity reformative minimum aggregation level algorithm (MAL) based on mathematical analysis and simulations. The conclusion shows that the algorithm could get most multi-user diversity gain with low complexity algorithm.