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Wireless Personal Communications: An International Journal
Overhaul of ieee 802.11 modeling and simulation in ns-2
Proceedings of the 10th ACM Symposium on Modeling, analysis, and simulation of wireless and mobile systems
CCMAC: coordinated cooperative MAC for wireless LANs
Proceedings of the 11th international symposium on Modeling, analysis and simulation of wireless and mobile systems
Practical relay networks: a generalization of hybrid-ARQ
IEEE Journal on Selected Areas in Communications
CoopMAC: A Cooperative MAC for Wireless LANs
IEEE Journal on Selected Areas in Communications
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This paper considers the impact of node mobility on the selection of tilIe lowest bit error rate (BER) relay path from access point to destination node in a downlink data transmission scenario. The access point uses link signal to noise ratio (SNR) measurements provided by the mobile nodes to select the path either as direct or two-hop via a mobile relay. The impact of delays in the measurement collection procedure in this scheme is analyzed in comparison to an ideal selection and an always direct scheme. An ns-2 and matlab based simulation framework is used to investigate effects of varying scenario parameters on the achieved average BER of data transmissions. The SNR measurement collection is based on periodic hello broadcasts. Results show that increasing node speed can lead to performance that is worse than always transmitting directly. The hello broadcast rate Clm mitigate this effect, however, at the cost of an increase in signaling overhead. We find that discarding old measurements can significantly improve the BER performance without increasing the signaling overhead. This result establishes the importance of joint tuning of the hello broadcast rate and the measurement storage time.