摘要
现网有60%以上重选是双模终端在TD-SCDMA网络驻留,进行语音通话,通话过程中由3G切换到2G,在2G挂断业务后又由2G网络重选至3G网络。按标准方案,挂机后,双模终端首选驻留2G网络,在IDLE态进行测量并重选3G网络,该流程时间较长,增加了终端呼叫不可及的概率。Fast Return方案针对这一场景进行重选时延优化,降低重选时延95%以上,大幅度缩小终端呼叫不可及时延,提升用户感受。目前FR方案有3种不同的实现方法,各有其不同优缺点,包括升级改造要求、重选时延优化性能、标准化情况等。本文着重介绍不同Fast Return方案原理,对比各种方案的优缺点,结合现网测试增益及升级改造要求,探讨不同方案对网络影响,为后续Fast Return方案应用策略的制定提供参考。
About 60 percent inter-system reselection is from the GSM / TD-SCDMA dual-mode terminals,which make voice calls on TD-SCDMA network,then handover to 2G network and reselect to TD-SCDMA network when hanging up.According to general scheme,the terminal should stay on 2G network and measure in idle state,then reselect to 3G network.The time for this process is very long and the user can not be paged.Fast Return is a method for inter-system reselection in this special scene,which can reduce the time for inter-system reselection about 95 percent and enhance the experience of user.There are three schemes realizing Fast Return,which have different advantages and disadvantages,including the request of equipment upgrading,the performance and the standardization.The paper introduces the principle of different schemes and contrast the advantages and disadvantages,combining with the performance and request of equipment,which make sense of application of Fast Return.
出处
《电信工程技术与标准化》
2011年第8期37-40,共4页
Telecom Engineering Technics and Standardization
