IMPROVEMENT OF WIRELESS NETWORK EFFICIENCY

Abstract

quotFrom its modest beginnings, the Internet has emerged as an imperative infrastructure servicing the data communication demands of the new generation. Both the proliferation of IEEE 802.11 based hand-held wireless terminals (e.g. laptops, PDAs, advanced cellular phones etc.) and the growing popularity of wireless Internet applications, led to the extensive deployment of wireless communication networks like WLAN in public domain. newlineNow a day networks are facing problem with Intermittent Connectivity, Long or Variable Delay, asymmetric data rates and High Error Rates. Delay Tolerant Network (DTN) may overcome these problems by using sore and forward message switching. The storage places can hold messages indefinitely. They are called persistence storage, as opposed to very short term storage provided by memory chips. DTN routers need persistence storage to store the packet until the next hope information is available with it. newline newlineDTN will allow BUNDLE layer on the top of transport layer. This will give node to node retransmissions by means of custody transfers. Such transfers are arranged between the bundle layers of successive nodes, at the initial request of the source application. newline newlineThe aim of this research is to enhance the performance of DTN routing protocols. This benefits the networks with either long delays or very lossy links. For path containing many lossy links, retransmission requirements are much lower for hop by hop retransmissions than for end to end retransmissions. newline newlineTo apply the same DTN protocols in the network in which vehicles are moving very fast and changing the topology after every second, Vehicular Delay Tolerant Network (VDTN) is developed. newlineIn VDTN, spray and wait protocol is giving better performance in any condition. To enhance the performance of Spray and Wait protocol the proposed algorithm is to transmit 70% of data to the nearby node instead of sending 50% data. This enables the node to transmit more data compared to the previous algorithm.