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随着无线自组网的发展,无线自组网提供实时多媒体业务成为重要的应用需求。作为下一代网络NGN中提供多媒体业务的SIP协议,应用于无线自组网时(特别是网络不可用时),会出现不提示用户、提示不及时、误振铃、资源泄漏等问题。通过深入分析发现标准SIP协议的可靠性机制还不够完善,因此设计了proceeding状态超时、180响应重复发送、实时感应、紧急巡查等新的可靠性机制,建议提高180响应的重要性并将可靠临时响应机制运用到180响应,建议有状态SIP服务器必须使用Session Timer(会话保持)机制,由此形成了比较完善的SIP协议可靠性机制。测试结果表明,完善后的SIP协议可靠性机制有效解决了网络不可用时引起的问题,在无线自组网中具有较好的适应性。
With the development of wireless ad hoc networks, wireless ad hoc networks to provide real-time multimedia services has become an important application requirements. As the next-generation network NGN multimedia services to provide SIP protocol, when used in wireless ad hoc network (especially when the network is not available), there will be no prompt users, prompts are not timely, ringing, resource leakage and other issues. Through in-depth analysis found that the standard SIP protocol reliability mechanism is not perfect enough, so the design proceeding state timeout, 180 response repeat sending, real-time sensing, emergency inspection and other new reliability mechanisms, it is recommended to improve the importance of 180 response and reliable temporary The response mechanism is applied to 180 responses. It is suggested that a stateful SIP server must use the Session Timer (Session Hold) mechanism, thus forming a relatively complete SIP protocol reliability mechanism. The test results show that the improved SIP protocol reliability mechanism effectively solves the problems caused when the network is unavailable and has good adaptability in wireless ad hoc networks.