Transport Protocols in Cognitive Radio Networks: A Survey
Xiaoxiong Zhong, Yang Qin, Li Li

TL;DR
This survey reviews the current transport protocols designed for cognitive radio networks, highlighting their unique challenges and comparing existing solutions to improve reliable communication amid spectrum uncertainty.
Contribution
It is the first comprehensive survey focusing on transport protocols in CRNs, detailing their challenges, features, and open research issues.
Findings
Identifies key challenges in CRN transport protocols
Provides a comparative analysis of existing protocols
Discusses open issues and future research directions
Abstract
Cognitive radio networks (CRNs) have emerged as a promising solution to enhance spectrum utilization by using unused or less used spectrum in radio environments. The basic idea of CRNs is to allow secondary users (SUs) access to licensed spectrum, under the condition that the interference perceived by the primary users (PUs) is minimal. In CRNs, the channel availability is uncertainty due to the existence of PUs, resulting in intermittent communication. Transmission control protocol (TCP) performance may significantly degrade in such conditions. To address the challenges, some transport protocols have been proposed for reliable transmission in CRNs. In this paper we survey the state-of-the-art transport protocols for CRNs. We firstly highlight the unique aspects of CRNs, and describe the challenges of transport protocols in terms of PU behavior, spectrum sensing, spectrum changing and…
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