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This paper considers the design of cross-layer opportunistic transport for stored video over wireless networks with a slow varying (average) capacity. We focus on two key ideas: (1) scheduling data transmissions when capacity is high; and (2), exploiting knowledge of future capacity variations. The latter is possible when users' mobility is known or predictable, e.g., users riding on public transportation...
In wireless mobile environments, the bandwidth and client capability are limited. Data broadcasting is an efficient and scalable method to disseminate information to a large amount of mobile clients. In recent years, several research has engaged in scheduling dependent data on multiple broadcast channels. However, most of the previous research focused on unordered queries and only few of them on ordered...
In this paper, we have presented an opportunistic multi-server scheduling scheme that distributes traffic on multiple wireless interfaces of a mobile router to improve service guarantees for competing flows during mobility. The proposed adaptive, scalable, multi-server (ASM) scheduling scheme extends guaranteed-rate(GR) service model to ensure bounded service delays for each packet of flows in accordance...
Data broadcasting is an effective way to disseminate information to a large amount of mobile clients in wireless mobile environments. The k nearest neighbor (kNN) search is one of the important location-based services. In this paper, we propose kNN search protocols using data broadcasting. We consider how the server generates the broadcast schedule with a Voronoi diagram and how the client can efficiently...
There have been various broadcast schemes based either on mobile users' data access frequencies or on the semantic relations of data.In this paper, we present a data broadcast scheme based both on the semantic relationship and the access probabilities. The broadcast scheme we propose generates a broadcast sequence according to the semantic relationship and replicates popular data items several times...
Advances in widespread, robust and inexpensive location and wireless communication technologies have resulted in an explosion of activities in the field of mobile services. Timely and relevant information enables informed decision-making and offers improvements for productivity, safety and security. One particular form of mobile service, known as mobile asset management systems (MAMS) has garnered...
Scheduling for multi-item queries is a problem of practical importance in the field of data broadcast. Most previous works solve the problem under the pattern that at each broadcast moment, the server broadcasts a number of data items which constructs a broadcast cycle with fixed length. Within this pattern, if a query is not scheduled in the current cycle, it usually has to wait for quite a long...
Video multicast handoff in wireless networks is challenged by various impairments, such as high bit-error-rate, connection disruption and asynchronous stream concatenation. We tackle this problem by proposing a two-stage multicast approach, where a video stream is distributed to a group of access routers using a regular IP multicast. Within a local subnet, each access router further replicates and...
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