LTE CSFB语音方案与性能分析

调查了业界关注的几种LTE语音方案现状,重点对目前运营商比较关注的CSFB语音方案进行了研究,包括CSFB信令流程和关键技术,例如联合附着、回落机制和MTRF等。最后针对各种回落机制对CSFB的性能影响进行了分析研究,结果表明当LTE回落到UMTS时,PS HO是最优方案,而当LTE回落到GSM网络时,R9 RRC Release with SIB是最优方案。

The Solution and Performance Analysis for LTE CSFB

Several voice solutions of LTE were introduced in this article. The CSFB solution which was attractive to telecommunication operator was addressed in detail, including CSFB signaling flow and key technologies, such as com- bined attach, fallback scheme and MTRF. At last, the performance of CSFB on different fallback scheme was analyzed. The results show that PS HO was the optimum solution when LTE UE fallback to UMTS network. However, RRC release with SIB fallback scheme is the optimum solution when LTE UE fallback to GSM network.