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http://dx.doi.org/10.14372/IEMEK.2014.9.6.353

Improving TCP Performance Over Cognitive Radio Networks  

Byun, Sang-Seon (Catholic University of Pusan)
Publication Information
IEMEK Journal of Embedded Systems and Applications / v.9, no.6, 2014 , pp. 353-360 More about this Journal
Abstract
In cognitive radio networks (CRNs), SU (secondary user)'s transmissions are frequently disrupted by PU (primary user)'s transmission. Therefore SU expereiences consecutive retransmission timeout and its exponential backoff, and subsequently, the TCP of SU does not proceed with the transmission even after the disruption is over or the SU succeeds to hold an idle channel. In order to solve this problem, we propose a cross-layer approach called TCP-Freeze-CR. Moreover we consider a practical scenario where either secondary transmitter (ST) or secondary receiver (SR) detects PU's transmission, which results in the need of spectrum synchronization mechanism. All of our proposals are implemented and verified with a real CRN testbed consisting of 6 software radios called USRP. The experimental results illustrate that standard TCP suffers from significant performance degradation and show that TCP-Freeze-CR greatly mitigates the degradation.
Keywords
TCP; TCP-Freeze-CR; Cognitive radio networks; Universal software radio peripheral (USRP); GNU radio;
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