Mobility

A Channel-Aggregation Diversity Based MAC Protocol in Power-Constrained Cognitive Ad Hoc Networks

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Executive Summary

One of the major challenges in the Medium Access Control (MAC) protocol design over Cognitive Ad Hoc Networks (CAHNs) is how to efficiently utilize multiple opportunistic channels, which vary dynamically and are subject to limited power resources. To overcome this challenge, in this paper, the authors first propose a novel diversity technology called Channel-Aggregation Diversity (CAD), allowing each secondary node to use multiple channels simultaneously with only one data radio per node under the upper-bounded power. Using the proposed CAD, they develop a CAD based MAC (CAD-MAC) protocol, which can efficiently utilize available channel resources through joint power-channel allocation while guaranteeing the transmission-time fairness.

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