A Construction And Stability Of Application Layer Multicast Coverage Model Based On HMTP In Mobile Environment

Recent years, with the rapid development of wireless communication technology, intelligent terminals form an explosive growth, and related mobile applications also show explosive growth trend, and people’s demands on the mobile network have increased. Research in the field of Application Layer Multicast conform to the trend and recommended to the study on mobile environment. The increasing user demands prompted researchers to propose more and more diversified strategy at the Application Layer Multicast on the mobile environment to continue improving network performance.Application Layer Multicast in mobile environment continues the characteristic in non-mobile environment, in which the terminals systems undertake the tasks of receiving and forwarding. Network models could show a greater diversity and functional performance differences due to the different strategies. Application Layer Multicast in mobile environment also has its own characteristics, differences and instability of terminals system could lead to system delays and worse transmission efficiency and so on. The stability and delay of network model and sending and receiving performance of client would seriously affect the efficiency of entire group broadcast network and users’ experience. Therefore, the study on how to build and optimize the Application Layer Multicast network in mobile environment became the issues researchers focused on, so that the network can complete data receiving and forwarding faster and more stable, and provide users with better services. Exploring its future development has important significance.By studying related algorithms and models of the Application Layer Multicast, this paper proposes Parent-Child High-Continuity Swap Strategy (PC-HCSS) and Partition Synchronous Recovery Strategy (PSRS) based on Application Layer Multicast in small-scale mobile environment.Firstly, the paper is based on a multicast tree constructed on the traditional HMTP protocol. By detecting nodes’ parameters periodically in multicast tree and under the premise of minimizing disconnected data transfer connection, the tree exchange some father node and his son node for acquiring better multicast tree topology and performance. The paper used OverSim overlay network simulation framework based OMNET++4.3 network simulation environment to build simulation and demonstrated the advantages of the model conducted by PC-HCSS model on the average delay by comparing with the previous model. In addition, in order to prove that the strategy can ensure high data continuity, the paper compared it to general strategy of switching nodes. The simulation result shows that PC-HCSS has a good advantage in small-scale mobile environment.Secondly, by analyzing the instability factors of terminals system in the actual environment, the paper proposed Partition Synchronous Recovery Strategy and simulate in the same premise and environment to previous PC-HCSS simulation. With respect to the traditional recovery strategy, the simulation certificated that the strategy can effectively improve the speed of malfunction recovery and the data transmission stability of terminals system and so on, so as to improve network efficiency and user experience.