On Multi-Channel MAC Protocols in Cognitive Radio Networks

A.K.-L. Yau, P. Komisarczuk, Paul D. Teal
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引用次数: 18

Abstract

Cognitive Radio (CR) exploits underutilized licensed spectrums to improve its bandwidth availability. Using CR technology, a node is able to adapt its transmission and reception radio parameters including channel frequency dynamically according to local spectrum availability. For channel access between wireless nodes, a cognitive Medium Access Control (MAC) protocol is necessary to coordinate the CRs. Multi-channel MAC protocol extensions have been proposed in IEEE802.11 to enable a node to operate in multiple channels in order to improve network-wide throughput. These multi-channel MAC protocols have several functions that can be leveraged by cognitive MAC protocols due to their similarities in certain aspects, though the CR has an additional requirement to cope with the existence of licensed users that have higher authority over the channels. Current research in cognitive MAC protocols assumes the availability of a common control channel at all times, which is an approach in the multi-channel MAC protocols. This approach has certain hardware requirements that may not be readily available at CR nodes. Hence, other approached may be necessary. In this paper, various types of multi-channel MAC protocols are reviewed, followed by discussion of their merits and demerits in multi-channel environments. The purpose is to show the additional functionalities and challenges that each multi-channel MAC protocol has to offer and address in order to operate in multihop CR networks. By providing discussion on possible technology leverage from multi-channel to cognitive MAC protocols, we aim to establish a foundation for further research and discussion.
认知无线网络中的多通道MAC协议研究
认知无线电(CR)利用未充分利用的许可频谱来提高其带宽可用性。利用CR技术,节点可以根据本地频谱的可用性动态调整其发送和接收无线电参数,包括信道频率。对于无线节点之间的信道访问,需要一种认知介质访问控制(MAC)协议来协调cr。在IEEE802.11中提出了多通道MAC协议扩展,使节点能够在多个通道中运行,以提高全网吞吐量。由于认知MAC协议在某些方面的相似性,这些多通道MAC协议具有一些可以被认知MAC协议利用的功能,尽管CR有一个额外的要求,以应对在通道上具有更高权限的许可用户的存在。当前认知MAC协议的研究假设在任何时候都有一个共同的控制通道可用,这是多通道MAC协议中的一种方法。这种方法有某些硬件要求,在CR节点上可能不容易获得。因此,可能需要其他方法。本文综述了各种类型的多通道MAC协议,然后讨论了它们在多通道环境中的优缺点。目的是展示为了在多跳CR网络中运行,每个多通道MAC协议必须提供和解决的附加功能和挑战。通过讨论从多渠道到认知MAC协议的可能技术杠杆,我们的目标是为进一步的研究和讨论奠定基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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