论文部分内容阅读
在LTE的覆盖盲区,4G高清语音需要切换技术保证语音连续性。SRVCC通过在2G网络重建会话实现切换,但切换延迟太大影响用户体验。e SRVCC改变了SRVCC重建完整通路的方式,只重建漫游方专用承载,从而大大改善了切换时延问题。本文从信令协议与实测排障,对eSRVCC的原理与SDP协商过程进行解析并提出改进建议。
In the coverage area of LTE, 4G HD voice requires handoff technology to ensure voice continuity. The SRVCC implements the handover by reconstructing the session over the 2G network, but the handover delay is too large to affect the user experience. e SRVCC changes the way that SRVCC rebuilds the complete path and reconstructs only the roaming-side dedicated bearers, greatly improving the handover latency. This paper analyzes the principle of eSRVCC and the process of SDP negotiation from the signaling protocol and actual measurement troubleshooting and puts forward suggestions for improvement.