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双语推荐：接力切换

TD—SCDMA移动通信系统在上行同步、智能天线和联合检测等一系列最新技术的基础上，采用了接力切换技术，它是TD—SCDMA移动通信系统关键技术之一。但现有的接力切换算法均依据信号差的绝对值设置判决门限。为了应对移动用户移动速度的不同和无线环境的差异情况下对切换决策的不同要求，提出了一种基于信号差值门限斜率的TD—SCDMA系统内切换判决时延算法。通过系统动态仿真，得出在选择合适的门限斜率值时，该切换算法与现有的算法相比更具有较好的切换率和掉线率性能。

Based on up-synchronization, smart antennas and joint detectionand other new technologies, ba-ton handover is adapted, as one of the key techniques in TD-SCDMA mobile communication system. How-ever the existing baton handover algorithms usually set the handover decision threshold in accordance with the absolute value of signals deviation. To cope with variousUE mobile speeds and radio environments, a delay-time algorithmbased on slope of signals deviation for handover decision is proposed. Computer simu-lation indicates the good performance of handover ratio and call-drop ratio is proved.

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切换技术维持着蜂窝移动通信系统中用户通信的连续进行,而其所采用的策略将直接影响切换的效果。根据TD-SCDMA系统的特点,提出了一种基于业务信道信号质量预留信道优先排队接力策略。该策略把移动用户划为业务信道信号质量差和质量好2类,并把业务信道信号质量差的用户排在等待队列中的前面,享有切换的优先权。模拟仿真表明,该策略有效地提高了切换成功率,改善了系统性能。

User equipment can perform a continuous communication maintained by handover technology in cellular mobile commu -nication system.During the process, the strategies adopted will directly affect the effect of handover .A strategy targeted at TD-SCDMA is developed ,which is based on the signal quality of the traffic channel and is called channel reservation with priority queuing .In the strategy, user equipment is divided into two types:one with bad traffic quality and the other with good signal quality , the former wait in front of the queue enjoys priority to handover .Simulation results show that the strategy increases the success rate of handover ,therefore, improves the system performance.