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Unsaturated throughput analysis of physical-layer network coding based on IEEE 802.11 distributed coordination function
LIN Shijun 1 * #,FU Liqun 2
1.Department of Communication Engineering, Xiamen University, Xiamen 361005
2.Institute of Network Coding, The Chinese University of Hong Kong, Hong Kong
*Correspondence author
#Submitted by
Subject:
Funding: the Natural Science Foundation ofChina （No.No. 61201195）, This work waspartially supported by the Specialized Research Fund for theDoctoral Program of Higher Education of China （No.No.20110121120019）, the Natural Science Foundation of Fujian Province of China（No.No.2011J01372 and No.2012J01292）
Opened online:12 September 2013
Accepted by: none
Citation: LIN Shijun,FU Liqun.Unsaturated throughput analysis of physical-layer network coding based on IEEE 802.11 distributed coordination function[OL]. [12 September 2013] http://en.paper.edu.cn/en_releasepaper/content/4558083
 
 
In this paper, we investigate the throughputperformance of physical-layer network coding (PNC) under the IEEE802.11 distributed coordination function (DCF). We consider thewireless network that two client groups communicate with each otheracross one relay node, and focus on the unsaturated network case.The difficulty in modeling the relay systems under the IEEE 802.11DCF is that the minimum contention window sizes of the client nodesand the relay node may be different, which makes the traditionalthroughput analysis methods for the non-relay wireless networksinapplicable. Fortunately, we find that the relay system can bedecomposed into four parts and respectively modeled. Analyticalresults show that the throughput gain of PNC scheme is heavilyaffected by the probability that a transmitted network-coding (NC)packet contains the information of two packets. The implication isthat the throughput benefit of PNC is more significant forbidirectional isochronous traffic with rate requirements. We furtherderive an approximate closed-form solution of the optimaltransmission probability of client nodes that maximizes the PNCnetwork throughput. We validate our analytical model throughextensive simulations and discuss the relationship between the PNCnetwork throughput and other system parameters, such as the minimumcontention window sizes of both the client nodes and the relaynode.
Keywords:Communication and Informationsystem; Physical-layer network coding; IEEE 802.11; unsaturatedthroughput analysis
 
 
 

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