Performance of Joint Spectrum Sensing and MAC Algorithms for Multichannel Opportunistic Spectrum Access Ad Hoc Networks

摘要

We present an analytical framework to assess the link layer throughput ofmultichannel Opportunistic Spectrum Access (OSA) ad hoc networks. Specifically,we focus on analyzing various combinations of collaborative spectrum sensingand Medium Access Control (MAC) protocol abstractions. We decomposecollaborative spectrum sensing into layers, parametrize each layer, classifyexisting solutions, and propose a new protocol called Truncated Time DivisionMultiple Access (TTDMA) that supports efficient distribution of sensing resultsin "k out of N" fusion rule. In case of multichannel MAC protocols we evaluatetwo main approaches of control channel design with (i) dedicated and (ii)hopping channel. We propose to augment these protocols with options of handlingsecondary user (SU) connections preempted by primary user (PU) by (i)connection buffering until PU departure and (ii) connection switching to avacant PU channel. By comparing and optimizing different design combinations weshow that (i) it is generally better to buffer preempted SU connections than toswitch them to PU vacant channels and (ii) TTDMA is a promising design optionfor collaborative spectrum sensing process when k does not change over time.