Data Transmitting Agent based Multicast Strategy for Effective cache Consistency In Mobile Environment

Abstract

In Mobile Wireless Communication Networks, caching data items at the mobile clients effectively reduces the delay associated by accessing the data. Efficient cache invalidation strategies are used to ensure the consistency between the data in the cache of mobile clients and the database server. Cache Invalidation strategies are used to achieve cache consistency in mobile environment. Conventional schemes for newlinemaintaining cache consistency for mobile environments are based on periodic broadcast of invalidation reports (IR). Servers use IR to inform the updates of data to the mobile clients whenever it is updated. Several newlineapproaches for sending IRs are Broadcasting Timestamp, Amnesic Terminals, Signatures, Bit Sequences, Absolute validity interval, etc. newlineThese approaches have several advantages and disadvantages. The mobile clients can uplink to the server to know the current update of the data in which they are interested. But the uplink requires more bandwidth and hence it is not economical. Wireless Broadcast allows a huge population of clients to receive information without actively newlineparticipating in communication. Although scalable and economical, broadcasting creates a lot of traffic on the network and also it is not sufficiently secure.