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This paper proposes a novel design of Publish/Subscribe (Pub/Sub) based system for event-driven video surveillance over wireless networks. Different from the previous Pub/Sub works, the proposed system considers the real-time requirement together with the system scalability. We study the problem of selecting an optimal subset of brokers for subscription forwarding in a large scale delay constrained...
Using multiple paths to transmit data simultaneously in wireless sensor networks is regarded to reduce end-to-end delay and achieve higher throughput. However, the interference between these multiple paths causes a significant reduction in the overall performance. Previous methods tried to solve this problem either with the aid of special hardware or under unrealistic assumption, such as the interference...
The performance of traditional TCP congestion control protocol degrades when congestion and contention increase in ad hoc networks that use the IEEE 802.11 DCF. Many of the problems result from medium contention at the media access control (MAC) layer. In this paper, we present a new contention-based congestion control (CBCC) method according to a novel congestion information from MAC layer. This...
With the development of both economy and society,service always requires higher and higher security and quality.However, since security services always induce extra resource consumption, QoS may descend evidently. It is important and essential to find optimal solutions that can not only achieve enough level of security, but also meet as high QoS as system can. In this paper, we propose an entity,...
A contention-based geographic routing (CGR) protocol for mobile ad hoc networks is proposed, which operates in two schemes: greedy-forwarding scheme and void-handling scheme. The greedy-forwarding scheme consists of basic mode and optional mode. In the basic mode, when receiving a data packet from upstream node, intermediate nodes within its forwarding area contend to relay it by waiting for a dynamic...
We present and verify the epsiv-optimal approximation scheme for on-demand multipath routing in ad hoc networks (epsiv-AOMDV), an extension to the well-studied ad hoc on distance vector (AODV). By introducing the hop count limiting parameter -epsiv, we modify the route update conditions and route discovery processes. The proposed protocol selects and maintains the multiple paths that are shorter than...
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