Challenges of Spectrum Handoff in Cognitive Radio Networks (original) (raw)
Cognitive Radio (CR) with Dynamic Spectrum Access (DSA) could alleviate the shortage of radio resources. Secondary Users (SUs) (unlicensed users) could access the spectrum when Primary Users (PUs) (licensed users) are inactive. The service interruption loss arises as secondary users try to handoff the channel to the legitimate users of the channels, the primary user. This new type of loss is different from losses as a result of network congestion and channel errors, experienced also by conventional wireless networks. Transport layer protocols' performance of an SU could be degraded significantly as it tries to handoff channel due to the arrival of a PU. The need to investigate SU's TCP performance during this period of sensing, hand-off, and looking for an alternative channel to continue transmitting is a challenging one. This paper presents a study of the challenges of spectrum handoff as PUs in CR networks appear in the course of an ongoing transmission by the SUs. A TCP rate adapting algorithm that ensures seamless spectrum handoff as PUs appear is proposed.
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