Design and development of cooperative caching framework for improving data accessibility in wireless AD HOC networks

Abstract

Mobile Ad Hoc networks are wireless network established by a group of mobile devices on a shared wireless channel without any infrastructure. The rapid development and self organizing nature make these type of network completely different from any other type of networks However, low bandwidth and frequent disconnections caused by node mobility makes high data accessibility a challenging problem in mobile ad hoc networks. Caching is a technique that has been deployed in networks to reduce network traffic and provide better response time for data accesses. The dynamic nature of ad hoc networks poses new problem for reliable cache management. As the nodes move arbitrarily, disconnection and network division occur frequently. In addition, the mobile devices have relatively limited computing resources and battery life. Therefore an effective caching technique should consider these issues to arrive at an optimal solution. A variety of cooperative caching protocols were proposed for MANETs to address the problem of data accessibility. Most of the available literature is cooperative caching concentrates in improving the user response time. However, in most of these studies, they have neglected the cache overhead and network scalability issues. An important requirement for the successful implementation off corporative caching in ad hoc networks is to make a balanced use of computation and communication resources. In the light of this, the purpose of the research work is to focus on several aspects of cooperative caching and particular to device a cooperative caching scheme that achieves high data accessibility with reduced cache overhead. The proposed scheme address cache management and cache discovery problem of cooperative caching. For cache management, a new cache replacement algorithm to improve cache hit ratio is presented and a cache placement policy to enhance the effective capacity of cooperative cache is proposed. The main goal of the cache discovery algorithm introduced is to get data correctly and efficiently with minimum overhead and bandwidth consumption. Another important criterion in cooperation caching is network scalability. The performance of various cooperative caching schemes degrades when the network sixe increases. The present work focuses as this issue and presents a scalable solution for cooperative caching. The performance of the proposed cooperative caching scheme was compared with the existing technique. newlineDesign and development of cooperative caching Framework for Improving Data accessibility in Wireless Ad Hoc Networks newline newline