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In this paper,we investigate the coverage optimization for LTE networks considering the network load.The network coverage is defined as the number of served users of evolved Node B (eNB) which is determined by eNBs’ antenna tilt angles (ATA).The coverage is optimized by optimizing the number of served users based on the Modified Particle Swarm Optimization (MPSO) algorithm.Simulation results show that both the number of served users by each eNB and the system throughput are significantly increased.As well,the average load and the bandwidth efficiency of the network are improved.