Journal of Information Processing Systems

Korea Information Processing Society (한국정보처리학회)
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An Experimental Implementation of a Cross-Layer Approach for Improving TCP Performance over Cognitive Radio Networks

  • Byun, Sang-Seon (Dept. of Computer Engineering, Catholic University of Pusan)
  • Received : 2014.09.17
  • Accepted : 2015.01.21
  • Published : 2016.03.31
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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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References

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