Research On Key Technology Of All IP Broadband Mobile P2P Network

To satisfy people's increasing desire for multimedia services, the mobile network is evolving to be broadband and all IP based, but there is still some harassment such as complex architecture and long periodical time of exploiting a new service in the proceeding of evolution. However, P2P is one of the most effective applications in the internet which is famous for a planate overlay and good expansibility. Therefore, researching on P2P in All IP Broadband Mobile network is a new important task. This dissertation focus on the key technology of all IP broadband Mobile P2P (AIM-P2P) network, and provides the schemes to solve the problems. Main work and contributions of this dissertation are outlined as follows:1. The Architecture of AIM-P2P is designed. The hybrid structure of P2P is most suitable to All IP Broadband Mobile Network. A two dimensional overlay is built up by adding distributed subscriber servers (DSS) on Packet Data Network Gateway (P-GW) which is one of key components in SAE. The core P2P layer combined with access layer and control layer forms the whole architecture of AIM-P2P. The bearing process of P2P application is designed according to the architecture. AIM-P2P network is proved to have low system cost by analysis in theory.2. An adaptive threshold hybrid Peer-to-Peer search algorithm (AHSA) is put forward based on the overlay of AIM-P2P network. The popularity of resource and its keywords is selected as the verdict parameters to improve its accuracy. The initial threshold is defined by utilizing the improved grey analysis method. An adaptive threshold scheme is proposed based on verdict parameters feedback which is adaptive to the dynamic environment. Simulation results show that AHSA has more advantage at the aspects of average latency and preciseness compared with classic hybrid search in the internet.3. A corporative Cache scheme is proposed. The concept of Cache Pool is defined on the basis of P-GW Pool in SAE. The Cache Pool optimizes the large flow of P2P services. A chunk based and type based storage scheme is utilized by analyzing the distribution of resource popularity. The scheme enhances the capacity and reliability. The three states of resource are defined according to the trend of popularity. The replacing scheme is put forward to basing on the state. Finally, the downloading period is analyzed using fluid model, the results show the scheme shorten the period of downloading effectively.