Adv Advantages And Disadvantages

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AODV COMPARISONS AND IMPROVEMENTS

Comparing AODV to DSR and improving AODV

Amal Raj
Ashu Grover
Gaurav Tyagi
Rahul Verma

Maharaja Surajmal Institute Of Technology (Computer Science Department)

AODV COMPARISONS AND IMPROVEMENTS

Abstract

Networking is the core for computer science technology and it is incomplete without the presence of various routing protocols present, which help in data transfer throughout the vast network of millions of computers present globally.
An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration.
Depending upon various factors different protocols
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That is, the sender knows the complete hop - by-hop route to the destination. These routes are stored in a route cache. The data packets carry the source route in the packet header. When a node in the ad hoc network attempts to send a data packet to a destination for which it does not already know the route, it uses a route discovery process to dynamically determine such a route. Route discovery works by flooding the network with route request (RREQ) packets. Each node receiving an RREQ rebroadcasts it, unless it is the destination or it has a route to the destination in its route cache. Such a node replies to the RREQ with a route reply (RREP) packet that is routed back to the original source. RREQ and RREP packets are also source routed. The RREQ builds up the path traversed across the network. The RREP routes itself back to the source by traversing this path backwards. The route carried back by the RREP packet is cached at the source for future use. If any link on a source route is broken, the source node is notified using a route error (RERR) packet. The source removes any route using this link from its cache. A new route discovery process must be initiated by the source if this route is still needed. DSR makes very aggressive use of source routing and route…show more content…
When there is a substantial increase in the degree of mobility of the wireless network more link errors are likely to occur. When this happens, route repair is typically performed to establish a new route. Such route repair mechanisms suffers with the problems like high control overhead and long packet delay making them inefficient due to frequent failures of intermediate connections in an end-to-end communication. When there is a breakage in the intermediate link, it is favorable to discover a new route locally without resorting to an end-to-end route discovery. In this paper we propose an improved AODV, an algorithm based on local route repair (LRR) mechanism such that the repair is confined to the vicinity of the broken

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