| Alone with the development of the multimedia communication technology,P2 P and SIP technology have all been widely used now days.It is becoming a research hotspot that how to effectively use the advantages of these two technologies in multimedia communication.A study about the structure and routing of P2 PSIP multimedia communication system is specified in this thesis.In order to improve the speed of users finding resources,a two-way fourth-order Chord lookup algorithm is proposed in this thesis.Meanwhile in order to improve the congestion of multimedia streaming,a MNPSMM routing algorithm is proposed in this thesis.Three mainly parts are included in this thesis which are shown as follow:Firstly,the P2 PSIP multimedia communication system based on the distributed SIP signaling control protocol and independently P2 P network is studied.As the P2 P network has the problem of poor compatibility,lack of resource query and routing timeliness,two improved methods are specified here:(1)In order to improve the compatibility of P2 P network,JXTA network is used as P2 PSIP hosted network which makes different P2 P networks work together.(2)In order to improve the timeliness of real-time communication,a P2P-Relay module is used in designing resource query and routing method.Secondly,in order to improve the speed of information querying in P2 PSIP multimedia communication system,a two-way four-order Chord algorithm is proposed here.This algorithm makes the density of routing table increase to 3Log44 k and simulation results show that it is faster to point the target node.Also the query speed of P2 PSIP system is greatly increased.Finally,in order to improve the congestion of P2 PSIP multimedia streaming,a MNSPMM routing algorithm is carried out based on non-shortest path routing algorithm for multimedia data streams.Comparing with MRowColum and MZigZag algorithms,this algorithms perform better in link congestion degree and path average congestion degree. |
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