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Sensor nodes in Cognitive Sensor Networks (CSNs) can work on different frequency bands (or channels) according to dynamically available wireless resources. This paper proposes a spectrum-aware routing scheme for CSNs, which jointly considers traffic balance, route configuration and power control for reliable end-to-end communications. Bayesian learning method is used to estimate the number of neighboring...
As a newly rising topic in network multicast Held, application layer multicast is widely concerned. Analyze and compare technical proposal of application layer multicast protocols Narada, NICE and HMTP, etc. used by typical wide P2P streaming media service model, make an outlook on study prospect of P2P streaming media and summarize study status and its existing problems of P2P streaming media, which...
This paper studies how to design distributed resource allocation in multi-radio multi-channel wireless mesh networks with the objective of maximizing the network utility. We address the problem via a cross-layer approach with a joint consideration of multi-path routing, congestion control, scheduling, radio allocation and channel assignment. The problem is formulated as a mixed-integer non-linear...
In this paper, we study the joint optimization problem on channel coding, power allocation, and route planning in wireless sensor networks (WSN) using dynamic programming (DP). Each sensor node has multiple antennas and applies orthogonal space time block codes (OSTBC) in order to improve the transmission reliability. A decode-and-forward protocol is adopted to relay the signals. The objective function...
Channel capacity and node energy represent resources and constraints in designing efficient routing schemes for Wireless Sensor Networks(WSNs). To delivery more data, a higher rate is desirable, which however consumes more energy and may demand more bandwidth. Hence, data transmission in WSNs should take into account both limited capacity and constrained energy. In this paper, we propose an utility-based...
In a cognitive wireless mesh network (CogMesh), each cognitive radio (CR) enabled mesh node can sense and opportunistically access the under-utilized spectrums in the primary system. Since the unoccupied spectrum is location- dependent and time-dependent, the available spectrums in each mesh node are different. With this spectrum heterogeneity, each node shall have the knowledge of spectrum, scheduling,...
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