D. Dhiravida Vasantha Nayaki, G. Mangayarkarasi
A mobile ubiquity services is an important element of cloud computing environments, for the reason it keeps an up-to-date list of presence information of mobile user. If presence updates occur often the number of messages distributed by presence server may lead to scalability problem and buddy list search problem in large-scale mobile presence services. To overcome the scalability problem proposed an efficient and ascendable server architecture called presence cloud. It organizes the presence server into quorum based server-server architecture for efficient searching. When a mobile user joins a network or internet, presence cloud searches the presence information. It also achieves small constant search latency by the directed search algorithm and one-hop caching strategy. Anatomize the performance of presence cloud in terms of search cost and search satisfaction level, without compromising each other.
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