DocumentCode :
61414
Title :
Spectrum Assignment and Sharing for Delay Minimization in Multi-Hop Multi-Flow CRNs
Author :
Xiaomeng Shi ; Medard, Muriel ; Lucani, Daniel E.
Author_Institution :
Res. Lab. of Electron., Massachusetts Inst. of Technol., Cambridge, MA, USA
Volume :
31
Issue :
11
fYear :
2013
fDate :
Nov-13
Firstpage :
2483
Lastpage :
2493
Abstract :
The throughput benefits of random linear network codes have been studied extensively for wirelined and wireless erasure networks. It is often assumed that all nodes within a network perform coding operations. In energy-constrained systems, however, coding subgraphs should be chosen to control the number of coding nodes while maintaining throughput. In this paper, we explore the strategic use of network coding in the wireless packet erasure relay channel according to both throughput and energy metrics. In the relay channel, a single source communicates to a single sink through the aid of a half-duplex relay. The fluid flow model is used to describe the case where both the source and the relay are coding, and Markov chain models are proposed to describe packet evolution if only the source or only the relay is coding. In addition to transmission energy, we take into account coding and reception energies. We show that coding at the relay alone while operating in a rateless fashion is neither throughput nor energy efficient. Given a set of system parameters, our analysis determines the optimal amount of time the relay should participate in the transmission, and where coding should be performed.
Keywords :
Markov processes; linear codes; network coding; random codes; relay networks (telecommunication); telecommunication power management; Markov chain model; coding energy; coding node; coding subgraph; energy constrained systems; energy efficiency; fluid flow model; half duplex relay; network coding; packet evolution; random linear network code; reception energy; wireless packet erasure relay channel; Encoding; Markov processes; Network coding; Relays; Throughput; Wireless communication; Wireless sensor networks; Cognitive radio networks; delay minimization; spectrum assignment; spectrum sharing;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.2013.131103
Filename :
6338378
Link To Document :
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