A Multi-Channel Diversity Based MAC Protocol for Power-Constrained Cognitive Ad Hoc Networks

TL;DR

This paper introduces a novel Multi-Channel Diversity (MCD) technology and a MAC protocol for cognitive ad hoc networks, enabling efficient multi-channel use with limited power and improving network throughput.

Contribution

It proposes the MCD technology and a MAC protocol that jointly optimize power and channel allocation using a knapsack problem approach, which is a novel solution in this context.

Findings

Significantly increases network throughput compared to existing protocols.

Efficiently utilizes multiple channels with a single radio per node.

Optimizes power-channel allocation through dynamic programming.

Abstract

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 we first propose a novel diversity technology called \emph{Multi-Channel Diversity} (MCD), allowing each secondary node to use multiple channels simultaneously with only one radio per node under the upperbounded power. Using the proposed MCD, we develop a MCD based MAC (MCD-MAC) protocol, which can efficiently utilize available channel resources through joint power-channel allocation. Particularly, we convert the joint power-channel allocation to the Multiple-Choice Knapsack Problem, such that we can obtain the optimal transmission strategy to maximize the network throughput through dynamic programming. Simulation results show that our proposed MCD-MAC protocol can significantly increase the network throughput as compared to the existing protocols.