tailieunhanh - A robusat and efficient data transmission in adhoc networks

Performance of the proposed caching algorithms is evaluated by simulating in NS2 under various ad hoc network scenarios. Simulation results reveal that, proposed solution successfully created data diversity in the adhoc networks which leads to an efficient data access. | ISSN:2249-5789 V Narayanarao et al , International Journal of Computer Science & Communication Networks,Vol 2(4), 543-547 A ROBUST AND EFFICIENT DATA TRANSMISSION IN ADHOC NETWORKS 1 2 , student, Aitam college, Tekkali, India Promod kumar sahu, Associate professor, Aitam college, Tekkali, India 1 2 promod_sahu@ Abstract Recently lot of interest has gained in ad hoc networks which are characterized as networks without any fixed topology due to high mobility. In ad hoc networks due to high mobility and lack of fixed infrastructure network disconnections occur frequently. Hence data accessibility in ad hoc networks is lower than in the fixed infrastructure networks. In this paper, we address cooperative caching mechanism to improve data accessibility in adhoc networks. Proposed solution is based on the size of the cache in nodes. For large-sized caches, nodes take decision independent of each other whether to cache some data and how long. In smallsized caches, a data replacement strategy allows nodes to store newly received data while maintaining the better performance in the data distribution system. Performance of the proposed caching algorithms is evaluated by simulating in NS2 under various ad hoc network scenarios. Simulation results reveal that, proposed solution successfully created data diversity in the adhoc networks which leads to an efficient data access. 1. Introduction In ad hoc networks, nodes communicate each other using multi-hop wireless links. Due to high mobility and lack of fixed infrastructure, each node acts as a router and forwards data to other nodes. Even if the source and the destination nodes are not in communication range to each other, data will be transferred to the destination node by forwarding through intermediate nodes. Since no special infrastructure is required, in various fields such as military affairs and commerce, many applications are expected to be developed in ad .