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Internet phone service quality assurance mechanism

Author: GuoFengJiang
Tutor: LiaoXiaoFei
School: Huazhong University of Science and Technology
Course: Computer Software and Theory
Keywords: Internet telephony Quality of Service Find redundancy Dynamic switching Sessions link recovery
CLC: TP393.02
Type: Master's thesis
Year: 2011
Downloads: 16
Quote: 2
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Abstract


P2P network has good openness and scalability, also has great dynamics and differences. It is this characteristic, making the introduction of P2P technology such as VoIP network environment requires a higher application brings the overall system performance at the same time, the user calls the service reliability is difficult to be guaranteed, mainly reflected in: the user can not ensure complete transit node of the application process; transit node service state a greater impact on the call quality of service; signaling in P2P network transmission can not be guaranteed. VoIP service quality assurance mechanisms designed to address P2P VoIP network environment, the system changes the system how to ensure quality of service issues. System by constructing P2P SIP session signaling network to achieve the P2P technology, is about the traditional centralized SIP server functionality using P2P networks. System by the super-node, end node, transit node boot, transit service node and transit nodes. Transit overlay network using multi-boot nodes and real-time updates of the way to ensure that the transit server and transit nodes join and search process effectiveness; user application initialization that is redundant relay server, transfer a call using redundant lookup algorithm and node selection algorithm to apply for transit node; when the client needs to make a call via transit mode, the system automatically detects during a session of both voice quality. The current session link poor call quality, the system can realize a call request reissue switching node and maintaining the call transfer function; multiplexing and backup forwarding SIP messages in the current super-node in case of failure over dynamically select successor servers, to ensure the reliability of signaling transmission. After the actual deployment of the system functional test, the results show that when the network environment changes, the system can dynamically select Switch calls transparently link to provide good quality of service sessions. In terms of performance, conducted through NS2 simulation results show that the current super-node failure, the call completion rate of over 99%; relay node selection algorithm, the average hit rate of 70% to 90%, and in the dynamic switching transit node, switching delay is small when the network will remain at less than 150ms. Test results show that the service quality assurance mechanism for the network to provide a good phone and reliability of fault tolerance is based on the feasibility of having.

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