On the performance of spectrum handoff for link maintenance in cognitive radio

Abstract

Cognitive radio (CR) has the potential for resolving the spectrum scarcity issue in wireless communications. A CR device can establish unharmful links in the spectrum of the legacy system. Among many enabling functions for CR, spectrum handoff can restore CR's connection when the primary user appears in the occupied channel. In this paper, we study three types of spectrum handoff for the link maintenance: (1) nonspectrum handoff method, (2) the pre-determined channel list spectrum handoff, and (3) the spectrum handoff based on radio sensing scheme. We examine the performances of the three mechanisms in terms of the link maintenance probability and the effective data rate of the secondary user's transmission. Our numerical results show that erroneous channel selection probability, radio sensing time and the number of handoff trials are important for spectrum handoff schemes. We also provide the design guideline for these parameters .

Cascaded Resource Allocation among Prioritized Shared Spectrum Blocks

“…The sums of the utilization of both SBs are the same regardless of applied algorithms as (11). The statistics on the utilization of each SB can be used for further decision-making or pricing of the SB renting.…”

“…Ref. 's [9]- [11] are studies related to SH. Giupponi et al [9] proposed a Fuzzy-based SH algorithm, in which they applied Fuzzy logic in making decision of SH.…”

“…Zhang [10] provided performance analysis of SH in terms of link maintenance probability, number of the SHs, switching delay, and non-completion probability. Wang et al [11] studied the SH's impact on the performance of the SU. Since the SH may cause degradation in Quality of Service (QoS) there are some previous works try to reduce SHs [12]- [14].…”

Spectrum handoff in cognitive radio with fuzzy logic control

“…In CR network, spectrum handoff means that we must find a new sub-channel to replace current sub-channel, and link maintenance will be implemented [10] . So spectrum handoff will cost time and take a considerable delay in communications, which may decrease the performance of CR system.…”

Call-level performance evaluation and QoS provisioning in cognitive radio networks

“…Multiuser spectrum selection schemes for spectrum sharing and resolving channel contention are analyzed in [8]. Various issues in spectrum handover are investigated in [9]- [13]. The feasibility of providing multimedia services over CR is researched in [14], [15].…”