Coexistence-Aware Spectrum Sharing for Homogeneous Cognitive Radio Networks

Abstract

Horizontal coexistence is one of the two representative coexistence problems in wireless networks, which is further divided into homogeneous and heterogeneous coexistence, as introduced in Chap. 1. In this chapter, we propose an inter-BS Coexistence-aware Spectrum Sharing (CASS) protocol for horizontal coexistence of homogeneous CR networks. CASS has the following noteworthy features: (1) it supports both non-exclusive and exclusive spectrum sharing and can dynamically switch between the two to minimize self-interference while keeping control overhead (induced by channel contentions) under control; (2) it uses a new channel selection algorithm that utilizes spectrum sensing results in order to minimize the likelihood of interference to incumbent transmissions; and (3) it uses an inter-BS channel contention procedure that enables a BS in need of more channels to borrow channels from its neighboring cells more readily (compared to 802.22’s ODSC).