基于SIP的VoWLAN漫游时延优化方法研究

An Optimization Method of Reducing Roaming Delay in SIP-Based VoWLAN

针对现有基于SIP的VoWLAN环境下漫游时延过长和漫游成功率不高的问题,本文提出了一种新的漫游管理服务器解决方案。此方案中由漫游控制服务器控制整个漫游过程,采用资源预申请和应用层预漫游以及对SIP_EYE的支持,减少漫游时延和提高漫游成功率,从而进一步减少漫游时延。通过网络仿真,证明了此方案在减少漫游时延和提高漫游成功率上的有效性和可行性,具有一定的实际应用价值。

To solve the problem of roaming delay and the low-efficiency roaming in sip-based VoWLAN, a new method, in this paper, is designed. In fact, the aspect of roaming should consider： channel detect and access,WLAN authentication,Network layer roaming,Application layer support of mobility etc. The whole roaming procedure needs each layers cooperating. This paper analyzes the current solution and proposes a new Roaming Manager Server （RMS） solution. The new solution can be proved efficiency and success by network simulation.