FQAC: a soft admission control scheme for high quality video delivery over cognitive radio wireless networks

Telecommun Syst (2015) 58:6780 DOI 10.1007/s11235-014-9874-7

FQAC: a soft admission control scheme for high quality video delivery over cognitive radio wireless networks

Pejman Goudarzi

Published online: 12 November 2014 Springer Science+Business Media New York 2014

Abstract Video transmission over error-prone cognitive radio wireless networks is a challenging task. In much of the traditional tight admission control algorithms for video cognitive users (CUs) in cognitive networks, CUs are admitted sequentially based on the strict quality of service and interference constraints imposed on the cognitive and primary users respectively. The sequential admittance of CUs may impose some form of the queuing delay for time-sensitive CUs which may be unacceptable. On the other hand, traditional admission control schemes do not consider the quality of experience of video users for admitting newly incoming ones. For addressing these issues and obtaining a more exible quality-centric admission control policy by which the admission system can admit eligible cognitive users in parallel, and to cope with uncertainties in the acceptable levels of the video quality for different CUs (which may use different softwares/hardwares with different capabilities) and interference levels imposed on the primary users, a soft admission control (SAC) technique (named FQAC) is proposed by which the admission probability level for the parallel CUs can intelligently be controlled based on some linguistic input variables. Numerical analysis has been performed to validate the efciency of the proposed quality-centric SAC mechanism in sparse and dense networking scenarios.

Keywords Quality of experience Cognitive radio

network Admission control CDMA

P. Goudarzi (B)

IT Department, Iran Telecom Research Center (ITRC), Tehran, Iran e-mail: [e-mail]

1 Introduction

Cognitive radio networks (CRNs) are designed to use the potentially unused wireless spectrum holes in the licensed band. Mitigating the imposed interference from the cognitive users (CUs) on the primary users (PUs) is always an important challenging research area especially in the underlay CRNs. In the case that CUs are broadband applications such as video, suppressing the CU-induced interference becomes even more challenging. In such scenarios, the admission and power control mechanisms must be designed such that, while guaranteeing the stringent and hard quality requirement of secondary users, make the interference power for the primary users below a target value.

Broadband multimedia content delivery over wireless networks has been converted to...