附註:Includes bibliographical references (pages 153-163) and index.
Cover -- Table of Contents -- Preface -- 1. INTRODUCTION -- 1.1 Reference Architecture of Wireless Computing Environments -- 1.2 Characteristics of Wireless Computing Environments -- 1.3 Potential, Benefits and Applications -- 1.4 Design Issues in Wireless Data Dissemination -- 2. MODELS FOR INFORMATION DISSEMINATION -- 2.1 Taxonomy of Data Delivery Mechanisms -- 2.2 Performance Metrics -- 3. DATA BROADCAST SCHEDULING -- 3.1 Organization of Broadcast for Push-based Broadcast System -- 3.2 Scheduling Strategies for Pull-based Broadcast System -- 4. INDEXING ON AIR -- 4.1 Data Organization for Selective Tuning -- 4.2 Flat Broadcast Programs with Indexes -- 4.3 Selective Tuning for Skewed Data Access -- 4.4 Non-flat Broadcast Programs with Indexes -- 4.5 Selective Tuning Mechanisms for Pull-Based Model -- 5. FAULT-TOLERANT BROADCAST ORGANIZATION -- 5.1 Fault on Air -- 5.2 Characteristics of Fault Tolerant Index -- 5.3 Inter-Index Schemes -- 5.4 Intra-Index Schemes -- 6. CACHE INVALIDATION MECHANISMS -- 6.1 A Taxonomy of Cache Invalidation Schemes -- 6.2 Cache Invalidation Schemes -- 7. BALANCING PUSH AND PULL -- 7.1 Architecture of Integrated Model -- 7.2 The Case for Dynamism -- 7.3 Adaptive Integrated Models -- 8. SUPPORTING RELATIONAL OPERATIONS -- 8.1 Cache Coherency Strategies in Pull-based Systems -- 8.2 Join Processing in Push-based Systems -- 9. CONCLUSIONS -- 9.1 Summary -- 9.2 Research Directions -- References.
摘要:In our increasingly mobile world the ability to access information on demand at any time and place can satisfy people's information needs as well as confer on them a competitive advantage. The emergence of battery-operated, low-cost and portable computers such as palmtops and PDAs, coupled with the availability and exploitation of wireless networks, have made possible the potential for ubiquitous computing. Through the wireless networks, portable equipments will become an integrated part of existing distributed computing environments, and mobile users can have access to data stored at information servers located at the static portion of the network even while they are on the move. Traditionally, information is retrieved following a request-response model. However, this model is no longer adequate in a wireless computing environment. First, the wireless channel is unreliable and the bandwidth is low compared to the wired counterpart. Second, the environment is essentially asymmetric with a large number of mobile users accessing a small number of servers. Third, battery-operated portable devices can typically operate only for a short time because of the short battery lifespan. Thus, clients are expected to be disconnected most of the time. To overcome these limitations, there has been a proliferation of research efforts on designing data delivery mechanisms to support wireless computing more effectively. Data Dissemination in Wireless Computing Environments focuses on such mechanisms. The purpose is to provide a thorough and comprehensive review of recent advances on energy-efficient data delivery protocols, efficient wireless channel bandwidth utilization, reliable broadcasting and cache invalidation strategies for clients with long disconnection time. Besides surveying existing methods, this book also compares and evaluates some of the more promising schemes.
