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Issue No. 07 - July (2015 vol. 26)
ISSN: 1045-9219
pp: 1999-2008
Qiang Ma , School of Software and TNList, Tsinghua University, Beijing, China
Kebin Liu , School of Software and TNList, Tsinghua University, Beijing, China
Zhichao Cao , School of Software and TNList, Tsinghua University, Beijing, China
Tong Zhu , School of Software and TNList, Tsinghua University, Beijing, China
Xin Miao , School of Software and TNList, Tsinghua University, Beijing, China
Yunhao Liu , School of Software and TNList, Tsinghua University, Beijing, China
ABSTRACT
How to shorten the time for channel waiting is critical to avoid network contention. Traditional MAC protocols with CSMA often assume that a transmission must be deferred if the channel is busy, so they focus more on the optimization of serial transmission performance. Recent advances in physical layer, however, allows a receiver to reengage onto a stronger incoming signal from an ongoing transmission or interference, and thus shows the potential of parallel transmissions. Indeed, even if the channel is busy, a node has opportunities to carry out a successful transmission. In this study, we propose opportunistic concurrency (OPC), a new MAC layer scheme, which enables sensor nodes to capture the opportunistic concurrency and carry out parallel transmissions instead of always waiting for a clear channel. Based on local concurrency map, which encodes the interactions among different links, OPC utilizes concurrency control algorithm to make transmission decision distributedly. Our experiments on a testbed consisting of 60 TelosB sensor motes identify the transmission opportunities in WSNs with OPC. Evaluation results show that OPC achieves a 17 percent reduction in packet latency, a 9.4 percent addition in throughput and a 10 percent reduction in power consumption compared with existing approaches.
INDEX TERMS
Interference, Concurrent computing, Signal to noise ratio, Receivers, Multiaccess communication, Wireless sensor networks, Media Access Protocol,wireless sensor networks, Concurrent MAC protocol
CITATION
Qiang Ma, Kebin Liu, Zhichao Cao, Tong Zhu, Xin Miao, Yunhao Liu, "Opportunistic Concurrency: A MAC Protocol for Wireless Sensor Networks", IEEE Transactions on Parallel & Distributed Systems, vol. 26, no. , pp. 1999-2008, July 2015, doi:10.1109/TPDS.2014.2329307
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