Improved 2Tier cooperative caching scheme for internet based vehicular adhoc networks (IVANETs)

IVANETs (Internet Based Vehicular Adhoc Networks) are the adhoc networks formed by moving vehicles without any permanent infrastructure and are characterized by frequent disconnections, frequent topological changes, as vehicles move at very high speed and can take unpredictable turns on their route. So their cached data items become stale, need to be updated from the server and it results in high data traffic and long query delays. In such circumstances, data availability and data consistency becomes very crucial. Availability of consistent and updated data is one of the important requirements in VANETs. Cooperative caching concept is beneficial to reduce the query latency time as well as network traffic as vehicles can share their cached content and uplink connections to the server is reduced. In our paper we are proposing a cooperative caching scheme which is an improvement over existing 2Tier CoCS (2tier Cooperative Caching Scheme).