LTE-A异构网络中上行链路联合功率控制策略
首发时间:2015-12-08
摘要:异构网络技术是LTE-A无线通信系统的关键技术之一,它可以扩大小区的覆盖范围、增大小区的系统容量、延长终端电池的使用寿命。LTE-A异构网络的郊区场景基站之间的距离(1732m)很大,信道条件较差,影响了系统的性能。传统的LTE-A上行功率控制方案仅采用部分功率控制算法,而对于郊区场景,需考虑路径损耗及传输带宽,以提高其系统性能。针对LTE-A异构网络的郊区场景,本文提出了一种联合功率控制策略。首先,对郊区场景按路径损耗阈值分区域;然后对信道条件较好的区域,采用基于路径损耗的闭环功率控制算法;对信道条件较差的区域,采用部分功率控制与自适应传输带宽技术相结合的开环功率控制算法。通过仿真表明,本文所提出的功率控制策略不但可以提高小区的边缘吞吐量和平均吞吐量,而且提高了用户终端电池的使用效率。
关键词: 异构网络 上行 功率控制 路径损耗 自适应传输带宽
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The Combined Uplink Power Control Strategy in LTE-A Heterogeneous Network
Abstract:The Heterogeneous Network (Hetnet) technology is regarded as one of key technologies of the LTE-A (Long Term Evolution Advanced) system. It can expand the area coverage, increase the system capacity and prolong the battery life of the User Equipment (UE). However, the Inter-Site-Distance (ISD, ISD=1732m) of the suburban scenario of the LTE-A HetNet is large, and the situation of the channel conditions is bad, which affects the system performance. The traditional Power Control (PC) scheme of the LTE-A uplink only applies the Fractional Power Control (FPC), but for the suburban scenario, the path loss and transmission bandwidth should be taken into account to improve the system performance. For the suburban scenario, a combined power control strategy is proposed. According to the path loss threshold, the suburban scenario is divided into different areas. For the area of good channel conditions, a closed loop PC scheme based on path loss is introduced; as for the poor channel conditions, an open loop power control scheme which combines the FPC and Adaptive Transmission Bandwidth (ATB) technology is proposed. It is demonstrated by system simulations that the proposed power control stategy can significantly improve the cell edge and average throughput,and takes into account the efficiency of battery power utilization.?
Keywords: Heterogeneous Network Uplink Power Control Path Loss Adaptive Transmission Bandwidth.
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