An energy efficient data reaccess scheme for data broadcast in mobile computing environments

Data broadcast approach is an efficient technique for disseminating data in mobile computing environments. To reduce the response time and the power consumption of the data broadcast approach, a mobile client may store frequently accessed data items in its cache. When a cached data item becomes out-of-date, the mobile client has to reaccess the new content of the data item from the broadcast channel. Reaccessing a cached data item may incur significant power consumption and suffer from a long delay. In this paper, we propose a data reaccess scheme which enables a mobile client to efficiently reaccess a cached data item. The strength of the proposed scheme lies in its capability to allow a mobile client to correctly reaccess its cached data items while the server inserts data items into or deletes data items from the broadcast structure in the course of data broadcasting. Our experiment shows that the proposed scheme significantly reduces the tuning time required in reaccessing a cached data item.