B. Uma Maheswari

Streaming video content to the end users with less delay and at the same time delivering content without compromising on the quality is a challenging task in peer to peer network. In this paper, a novel algorithm for constructing a scalable and robust hybrid overlay structure for video streaming is proposed. Peers are arranged in three layers namely mesh, tree and mesh cluster. They are connected to any of the layers on the basis of its reputation; the peers have reputation above a certain threshold are connected in meshor tree structure otherwise connected to mesh cluster. It supports more number of peers by connecting high reputed peers near streaming server and robustness of the proposed overlay structure to peer churn is achieved by the usage of mesh structure. Simulation results exhibit the characteristics of the proposed three-layer hybrid video streaming architecture and its performance with respect to end to end delay. It takes 19.41% less delay than mTreebone to stream video.

To fulfill the end-users demand for access to the Internet “anywhere-anytime” and ensure quality of service, is the WiMAX (Worldwide Interoperability for Microwave Access) technology standardized based on IEEE 802.16 that provides efficient packet radio interface enabling transmission of high data rates. WiMAX network became popular and receives growing acceptance as a Broadband Wireless Access (BWA) system which is the solution of “last mile” wireless broadband. WiMAX has potential success and is gaining hike all over the world for deployment of the network in its line-of-sight (LOS) and non-line-of-sight (NLOS) conditions for both fixed operation below 11GHz and Mobile operation below 6 GHz frequency range. In the first step of cell planning and deployment of wireless network, estimation of path loss is very important in turn to get better signal strength to access Internet. In this work, we have used well-structured propagation models for analysis and comparison at different terrain areas, the models are - COST231 Hata model, COST231 Walfisch-Ikegami model, ECC-33 model, Ericsson model, and SUI model for SIMO (Single-input Multiple-output) channels. Using environmental parameters and some correction factors path loss is calculated for all terrain (urban, suburban, and rural) conditions. This provides guidelines for cell planning of mobile WiMAX at cellular frequency between 2-6 GHz.