A Time Index Based Approach for Cache Sharing in Mobile Adhoc Networks

Initially wireless networks were fully infrastructure based and hence imposed the necessity to install base station. Base station leads to single point of failure and causes scalability problems. With the advent of mobile adhoc networks, these problems are mitigated, by allowing certain mobile nodes to form a dynamic and temporary communication network without any preexisting infrastructure. Caching is an important technique to enhance the performance in any network. Particularly, in MANETs, it is important to cache frequently accessed data not only to reduce average latency and wireless bandwidth but also to avoid heavy traffic near the data centre. With data being cached by mobile nodes, a request to the data centre can easily be serviced by a nearby mobile node instead of the data centre alone. In this paper we propose a system , Time Index Based Approach that focuses on providing recent data on demand basis. In this system, the data comes along with a time stamp. In our work we propose three policies namely Item Discovery, Item Admission and Item Replacement, to provide data availability even with limited resources. Data consistency is ensured here since if the mobile client receives the same data item with an updated time, the previous content along with time is replaced to provide only recent data. Data availability is promised by mobile nodes, instead of the data server. We enhance the space availability in a node by deploying automated replacement policy.