DefinePK

Abstract

Social network applications are flattering progressively more familiar on mobile network. A mobile presence application is an imperative constituent of a social network application because it manages each mobile user’s occurrence information, such as the current standing (online/offline), GPS locality and network address, and also updates the user’s network friends with the information frequently. If updates occur habitually, the enormous number of messages distributed by servers may lead to a scalability problem in a large-scale mobile presence service. By avoiding the problem, we put forward efficient and scalable server structural design, called Presence Cloud; this enables mobile presence services to support large-scale social network applications. When a mobile user comes under a network, Presence Cloud searches for the presence of his/her friends and notifies them of his/her advent. Presence Cloud organizes quorum-based server-to-server architecture to improve searching performance. A directed search algorithm and a one-hop caching strategy to accomplish small constant search latency. We are going to analyze the performance of Presence Cloud in terms of the search cost and search satisfaction level. The search cost is depending on the total number of messages leaved by the presence server when a user arrives; and search satisfaction level is depend on the time takes to search for the arriving user’s friend list. The results of simulations exhibit that Presence Cloud achieves performance gains in the search cost without compromising search satisfaction.