cdma2000 1xEV-DO Rev A系统切换服务延时性能

Analysis of Handoff Serving Delay in cdma2000 1xEV-DO Rev A

通信系统中时延是一项重要的服务质量(QoS)参数。讨论了cdma2000 1xEVDO系统中的虚拟软切换过程,分析了产生切换服务延时的原因,说明调度方法和小区中服务用户数量不仅会影响吞吐率,也会影响切换服务延时。因此,当用户数量较多时,可优先调用处于切换状态的实时用户,以满足实时业务的QoS需求。

Delay is an important QoS attritue in communication systems. In the downlink of cdma2000 1xEV-DO system, virtual soft handoff technology is implemented through sector selection among related sectors. This paper discusses in detail the procedure of virtual soft handoff, analyzes the reasons of service delay caused by handoff. Simulation results show that scheduling scheme and the number of users in the cell will not only impact on total throughput, but also impact on the handoff serving delay. In order to provide QoS, the data queue of realtime traffic when corresponding user is in handoff state could be allocated higher priority if the number of users is large.