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引用次数: 3
摘要
本文介绍了一种基于混合自动重复请求(HARQ)传输次数的WCDMA增强型上行链路(E-UL)节点b位外环功率控制(OLPC)算法。该算法不受节点B与无线网络控制器(RNC)之间信令延迟的影响,可以充分利用HARQ协议的优点。然而,当考虑软切换(SHO)情况时,出现的载波干扰比(CIR)漂移问题会影响OLPC的性能,需要一些机制来补偿CIR漂移问题。积极调优的anti-windup功能和基于重传序列号(RSN)的功能都可以处理此问题。在2 ms和10 ms的传输时间间隔(tti)下对提议的节点b位置的OLPC进行评估。可以观察到,位于节点b的OLPC在较低的CIR方面提供增益,并且对于2 ms TTI更有利,因为RNC信令延迟在较短的往返时间(RTT)中具有相当严重的影响。
Outer-loop power control based on hybrid ARQ protocol for WCDMA enhanced uplink
In this article, a node B-located outer-loop power control (OLPC) algorithm for WCDMA enhanced uplink (E-UL) based on the number of hybrid automatic repeat request (HARQ) transmission attempts is introduced. The proposed OLPC algorithm can take full advantage of the HARQ protocol since its operation is not affected by the signaling delay between node B and radio network controller (RNC). However, when the Node B-located OLPC is considered in a soft handover (SHO) situation, the Carrier-to-interference Ratio (CIR)-drift problem that emerges compromises the OLPC performance, and some mechanism to compensate for the CIR-drift problem is required. Both an aggressively tuned anti-windup function and an retransmission sequence number (RSN)-based functionality handle this problem. The proposed Node B-located OLPC is evaluated for 2 ms and 10 ms transmission time intervals (TTIs). It is observed that the Node B-located OLPC provides gains in terms of lower CIR and is more beneficial for 2 ms TTI, since the RNC signaling delay has rather severe impact in a shorter round trip time (RTT).