LTE-A上行链路联合功率控制方案

Joint power control scheme for LTE-A uplink

LTE-A上行功率控制技术在补偿用户小区内路径损耗和降低小区间干扰方面发挥很大的作用。针对PUSCH(physical uplink shared channel,物理上行共享信道)功率控制方案进行了研究,考虑到边缘用户功率过小出现的解错问题,提出一种改进的开环和闭环联合控制的功率控制方案。闭环功率控制方案中,对基于上报的功率余量处理方案进行改进,改进方案考虑了每个资源块功率余量,并合理地设置了目标信干噪比的取值范围;同时,对开环功率控制中两个开环参数部分路损补偿因子α和小区特定参数p_0的选取作了进一步的规范。实验结果表明,改进的方案在小区吞吐量方面性能更优。

Power control for uplink in LTE-A played a significant role in compensating the path loss of intra-ce11 users and mitigating inter-cell interference. Considering the lower power value of edge users might lead to the wrong demodulation of resource block（RB） in uplink, this paper proposed an improved power control scheme combined with open loop power control and closed loop power control in PUSCH. With the closed looppower control scheme, this work improved the power headroom report-based algorithm, which took the power margin for each RB into consideration. And it also set the range of target signal to interference plus noise ratio reasonably. While this paper also further specified the two open loop parameters that path loss compensation factor and a cell-specific parameter. Experimental results show that in terms of cell throughput, the improved program performs better.