Cache Invalidation and Replacement Strategies for Location-Dependent Data in Mobile Environments
IEEE Transactions on Computers
ICALP '02 Proceedings of the 29th International Colloquium on Automata, Languages and Programming
Caching and Scheduling for Broadcast Disk Systems
Journal of Experimental Algorithmics (JEA)
Performance Evaluation of an Optimal Cache Replacement Policy for Wireless Data Dissemination
IEEE Transactions on Knowledge and Data Engineering
Broadcast program generation for webcasting
Data & Knowledge Engineering
Adaptive multiversion data broadcast organizations
Information Systems - Special issue: ADBIS 2002: Advances in databases and information systems
Circular arrangements and cyclic broadcast scheduling
Journal of Algorithms
Web Caching in Broadcast Mobile Wireless Environments
IEEE Internet Computing
Efficient location-based decision-supporting content distribution to mobile groups
IEEE/ACM Transactions on Networking (TON)
Agent-based Mobile Data Caching Strategies Using Data Significance
Journal of Integrated Design & Process Science
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Broadcast disks are an emerging paradigm for massive data dissemination. In a broadcast disk, data is divided into n equal-sized pages, and pages are broadcast in a round-robin fashion by a server. Broadcast disks are effective because many clients can simultaneously retrieve any transmitted data. Paging is used by the clients to improve performance, much as in virtual memory systems. However, paging on broadcast disks differs from virtual memory paging in at least two fundamental aspects: A page fault in the broadcast disk model has a variable cost that depends on the requested page as well as the current state of the broadcast. Prefetching is both natural and a provably essential mechanism for achieving significantly better competitive ratios in broadcast disk paging. In this paper, we design a deterministic algorithm that uses prefetching to achieve an O(n log k) competitive ratio for the broadcast disk paging problem, where k denotes the size of the client's cache. We also show a matching lower bound of $\Omega(n\log k)$ that applies even when the adversary is not allowed to use prefetching. In contrast, we show that when prefetching is not allowed, no deterministic online algorithm can achieve a competitive ratio better than $\Omega(nk)$. Moreover, we show a lower bound of $\Omega(n \log k)$ on the competitive ratio achievable by any nonprefetching randomized algorithm against an oblivious adversary. These lower bounds are trivially matched from above by known results about deterministic and randomized marking algorithms for paging. An interpretation of our results is that in the broadcast disk paging, prefetching is a perfect substitute for randomization.