MOBILE CACHING SYNCHRONOUS CACHING TECHNIQUES FOR STATELESS SERVER

Abstract

In mobile computing environment, a large number of users equipped with low powered palmtop machines will query databases over the wireless channels. Caching of frequently accessed data items is an important technique to reduce contention on the narrow bandwidth wireless channel. For caching to be effective, the cache content must be consistent with that stored in the server. However this is difficult to implement due to Iow battery power (energy) which results in frequent disconnection of mobile clients. This dissertation demonstrates the importance of tuning the data for mobile caching. schemes which helps in reducing the amount of energy consumed. A new scheme named Tuned Double Report Scheme which reduces the amount of energy consumed using selective tuning is also proposed. It is compared with the existing three schemes namely Bit Sequences, Double Report and Bit Sequences with counters. The former two schemes do not consider energy while the later takes energy into consideration. Tuned Double Report Scheme is the modified version of Double Report Scheme. Simulation is done using C on windows environment. Tuned Report Scheme works better than others in most cases while Bit Sequences with Counters Scheme works better when the update rate is low or high