Mobile P2p Network Resource Node Selection Algorithm Research

In this paper we consider the framework of wireless P2P system and propose a novel peer selection algorithm named CF-FCM (Cell First, FCM based) over3G networks environment. The peer selection algorithm runs in the Tracker of the framework of wireless P2P system. Due to the wireless networks environment was complicated, it’s hard to compute the terminal’s service abilities. In order to solve this problem we use the theory of FCM[1]to describe the influence among a lot of factors including uplink bandwidth, delay, radio link quality, energy level, lingering time and moving speed. which also impact the terminal’s service abilities. Besides, the algorithm keeps the rules that it will choose cell first. The cell should has a lowest traffic load. Then the algorithm selects a peer with highest service ability in this cell, and this process will be repeated until the requested number of peers is reached. Simulation results indicate that the CF-FCM scheme can achieve excellent load balance on the cells in3G cellular networks while assuring good peer performance, and compared with other two peer selection schemes our scheme is a favorable. In P2P file sharing systems over mobile cellular networks, the bottleneck of file transfer speed is usually the downlink bandwidth of the receiver rather than the uplink bandwidth of the senders. In this paper we consider the downlink bandwidth limitation and propose two novel peer selection algorithms named DBLC-CF-N and DBLC-CF-B, which are designed for two different cases of the requesting peer’s demand respectively. Our algorithms take the requesting peer’s downlink bandwidth as the target of the sum of the selected peers’ uplink bandwidth, and they also adopt an idea called cell first to ensure load balance. We also provide a Fuzzy Cognitive Map that can be used to estimate peers’service ability in P2P systems over mobile cellular networks. Simulation results show that in respective cases DBLC-CF-N and DBLC-CF-B can both achieve good load balance on cells while ensuring good file transfer speed.