Feedback Bits Allocation for Guaranteed Bit Rate Services in Cooperative Cognitive Radio Networks.

Deokhui Lee,Jaewoo So

doi:10.3390/s20020469

Abstract

As the number of users using multimedia sharing services increases, the need to ensure the minimum data rate of wireless users increases. Meanwhile, in the cooperative cognitive radio (CR) network, it is important to provide the quality-of-services for secondary users (SUs) while satisfying the inter-network interference constraint from secondary transmitters to primary users (PUs). Under the limited feedback resource constraint, this paper proposes a feedback bits allocation scheme for the guaranteed bit rate services of SUs while satisfying the inter-network interference constraint. This paper investigates how many feedback bits between the ST and PUs are required to guarantee the minimum data rate of SUs and then proposes a feedback bits allocation scheme that maximizes the average sum rate of SUs while reducing the outage probability of SUs.

Highlights

As the number of users using multimedia sharing services such as Youtube increases, it is important to use limited spectrum resources efficiently in order to ensure the minimum data rate for wireless users
The power control and beamforming in Cognitive radio (CR) networks is a promising technique that suppresses the inter-network interference, where the secondary transmitter (ST) needs to obtain the channel direction information (CDI) between the ST and primary users (PUs) through the cooperative feedback from PUs, which results in the increase of the feedback overhead [5,6,7,8]
The results show that the proposed scheme of this paper outperforms the feedback bits allocation scheme of [17] in terms of meeting the minimum data rate requirement of secondary users (SUs)

Summary

Introduction

As the number of users using multimedia sharing services such as Youtube increases, it is important to use limited spectrum resources efficiently in order to ensure the minimum data rate for wireless users. Cognitive radio (CR) efficiently use the limited spectrum by sharing the the spectrum assigned for a primary network with secondary users (SUs) [1,2]. The primary users (PUs) and SUs can transmit data at the same time in underlay CR networks. In the underlay CR network, it is important to keep the inter-network interference from the secondary network to the primary network below a certain value while providing the quality-ofservices (QoS) for SUs [3,4].

Objectives

Results

Conclusion