Design And Implementation Of Special Mobile Integrated Communication System Based On WMN

Wireless Mesh networks(WMNs)which is known as the "multi hop(multi-hop)network is a wireless broadband network technology based on IP protocol.WMNs have the multipoint to multipoint reticular structure and the advantages of self-organized,multi hop,flexible structure,convenience installation and so on.This makes the application value of wireless mesh network increasing and expanding.According to the actual application requirements,a mobile IP mobility access method is proposed.The method is suitable for certain-scale lattice structures WMN networks,which could keep the service connection when the terminals are moving and support mobile PTT service or other IP service.This paper mainly focuses on the following two parts:1.A IP mobility access scheme based on WMN is researched and designed.Based on a comprehensive analysis of the main methods of support terminal mobility and mobility management technology,and combined with the characteristics of the construction of mobile access network based on WMN,a scheme that can achieve the objectives and requirements of the IP mobile access is proposed.The scheme has the advantages of low delay,convenient access and no triangle routing.The software development of this program is realized on the Linux platform;2.A PTT service technology system scheme for the mobile IP access terminal based on WMN is studied and designed.Based on the comprehensive study of the existing trunking communication technology,and combined with the construction and characteristics of the mobile IP access network based on WMN,a system scheme that is based on application layer multicast technology is proposed to support the mobile terminal PTT communication.The software development of this scheme is realized in the end.On the Linux platform,the key technology and function system of the special wireless mesh network is designed and implemented,which include the gateway,the access front end,the central mapping server and the service agent.Based on the experimental network environment,the key technologies of mobile PTT service support system are tested and verified.The research results show that the design for mobile IP access network and the PTT technology application system based on WMN have the validity and rationality.