An Experimental Implementation of a Cross-Layer Approach for Improving TCP Performance over Cognitive Radio Networks

Sang-Seon Byun
Volume: 12, No: 1, Page: 73 ~ 82, Year: 2016
10.3745/JIPS.03.0041
Keywords: Cognitive Radio Networks, Congestion Control, TCP, USRP
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Abstract
In cognitive radio networks (CRNs), the performance of the transmission control protocol (TCP) at the secondary user (SU) severely drops due to the mistrigger of congestion control. A long disruption is caused by the transmission of primary user, leading to the mistrigger. In this paper, we propose a cross-layer approach, called a CR-aware scheme that enhances TCP performance at the SU. The scheme is a sender side addition to the standard TCP (i.e., TCP-NewReno), and utilizes an explicit cross-layer signal delivered from a physical (or link) layer and the signal gives an indication of detecting the primary transmission (i.e., transmission of the primary user). We evaluated our scheme by implementing it onto a software radio platform, the Universal Software Radio Peripheral (USRP), where many parts of lower layer operations (i.e., operations in a link or physical layer) run as user processes. In our implementation, we ran our CR-aware scheme over IEEE 802.15.4. Furthermore, for the purpose of comparison, we implemented a selective ACK-based local recovery scheme that helps TCP isolate congestive loss from a random loss in a wireless section.

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Cite this article
IEEE Style
Sang-Seon Byun, "An Experimental Implementation of a Cross-Layer Approach for Improving TCP Performance over Cognitive Radio Networks," Journal of Information Processing Systems, vol. 12, no. 1, pp. 73~82, 2016. DOI: 10.3745/JIPS.03.0041.

ACM Style
Sang-Seon Byun, "An Experimental Implementation of a Cross-Layer Approach for Improving TCP Performance over Cognitive Radio Networks," Journal of Information Processing Systems, 12, 1, (2016), 73~82. DOI: 10.3745/JIPS.03.0041.