GSM: gateway selection mechanism for strengthening inter-cluster coordination in cognitive radio ad hoc networks

Najam Ul Hasan,Waleed Ejaz,Hyung Seok Kim,Kamran Manzoor

doi:10.1186/1687-1499-2013-171

Najam Ul Hasan, Waleed Ejaz + Show 2 more

Open Access

https://doi.org/10.1186/1687-1499-2013-171

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Abstract

Abstract In the open access spectrum paradigm, the dynamics of the available spectrum heterogeneity due to the geographical location of various cognitive radio/secondary users (SUs) and primary users (PUs) prevent the assignment of a single common control channel to every SU. Thus, depending on channel availability, SUs are forced to form clusters to solve the problem of control channel assignment. However, the sudden appearance of a PU may lead to loss of intra-cluster or inter-cluster connectivity among SUs. This problem can be resolved by improving the cluster formation process and selecting suitable gateway nodes for inter-cluster coordination. In this paper, our goal is to improve inter-cluster connectivity by selecting more appropriate gateway nodes for inter-cluster coordination. We therefore propose an inter-cluster gateway node selection mechanism that strengthens inter-cluster coordination. Our scheme shows significant improvement in terms of inter-cluster connectivity compared with related work.

Highlights

Cognitive radio (CR) networks have gained much attention in the research community in the last decade and have emerged as a promising approach to solving the issues of spectrum scarcity [1]
gateway selection mechanism (GSM)′ performance is comparable with spectrum opportunity-based clustering (SOC), but lower than GSM because it has less number of common channels designated for intra-cluster communication, which results in the reduction of degree of the candidate gateway nodes, which is based on the number of channels which a node can have common with the common channel designated in the neighboring cluster
We looked at the effect of spectrum heterogeneity and primary users (PUs) dynamic force in the formation of a group-based control channel assignment for cognitive radio ad hoc network (CRAHN)

Summary

Introduction

Cognitive radio (CR) networks have gained much attention in the research community in the last decade and have emerged as a promising approach to solving the issues of spectrum scarcity [1]. To account for PU dynamics and spectrum heterogeneity issues, several researchers have proposed cluster-based approaches for control channel design of CRAHNs [5-8]. To avoid frequent re-clustering in response to PU activity and spectrum heterogeneity, the concept of backup control channels has been introduced. In [12], Liu et al extended this concept of backup control channel in CRAHNs by proposing a cluster-based control channel allocation scheme called spectrum opportunity-based clustering (SOC). In the case of a cluster-based control channel design for a CRAHN, the cluster head node is responsible for allocating a set of control channels out of the set of channels available to every member of that cluster.

Problem statement and system model

Findings

Conclusion