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.

Live streaming applications become hugely popular in the Internet era. However, these applications place tremendous pressure on video servers. Peer-to-Peer (P2P) communication models are a wise solution to video server pressure due to their scalability and low cost. Many P2P streaming schemes have been proposed and deployed on the Internet. These approaches are mainly based on the tree, mesh, and hybrid overlay structures. However, most overlay structures are proposed for either wired or wireless networks, and their performance was not investigated for both wired and wireless networks. We propose a reputation-based, resilient, delay-resistant hybrid overlay streaming structure called AStream. This hybrid structure aims to multicast videos to peers with the primary goal of delivering video packets before the deadline and maintaining good video quality over both wired and wireless networks. The overlay evolves from tree to a hybrid structure consists of tree and mesh clusters over a period of time. Initially, a tree is constructed using arrival time and location-based approach and is then transformed to a hybrid overlay to reduce delays in video data delivery. Video continuity during peer dynamics is guaranteed by providing multiple parents and auxiliary connections. Simulations are carried out by applying the proposed scheme in both wired and wireless networks. We also investigate the additional delays incurred when the video server is located outside the Wi-Fi network compared to those when the video server is located inside the wireless mesh network. Simulation results show that AStream outperforms the existing overlay structures and delivers faster, better video content with reduced load on the underlying physical network.

Recent advancement in the network technology and infrastructure support video streaming over multiple paths. Realizing high quality video streaming over Mobile Adhoc Networks (MANET) is a very challenging task. This paper proposes an Application Layer Based Capability Aware protocol for single server multi user live streaming application. In wireless network each device has different capability in terms of data-storage, mobility, forwarding data, availability etc., and proposed protocol aims to realize these capabilities and to distribute video chunks in multiple paths by segmenting the stream based on its capacity. This is achieved with the help of Fenwick Tree – a data structure which is integrated in the Application Layer. The system is implemented and tested under various scenarios. The results show there is a considerable increase in throughput and decrease in total transfer time. © Research India Publications