Throughput optimization for multi-channel cooperative CR under reporting channel errors

To overcome the problem of channel fading and noise uncertainty,cooperative spectrum sensing(CSS)is developed to enhance the sensing performance in cognitive radio networks(CRNs).Considering that the non-ideal reporting channels of CSS can cause an adverse impact on the detection performance,the throughput maximization problem for multi-channel CSS cognitive radio under reporting channel errors is investigated.While providing all the primary users with sufficient protection,the average throughput of secondary users(SUs)is maximized by jointly optimizing the sensing duration,detection threshold and SU assignment.To address the non-convex optimization problem,the optimal energy detection threshold is derived first.Then,a sub-optimal greedy algorithm is proposed to obtain the optimal sensing duration and the optimal SU assignment.Analysis and simulation results show that the proposed algorithm can output the same performance as the exhaustive search algorithm at a much lower level of complexity.It is also shown that the impact of imperfect reporting channels should be considered especially in low signal-to-noise ratio environments and the reporting channel errors significantly reduce the performance of CSS.

A flexible scheduling algorithm for the 5th-generation networks

At present,the 5th-Generation(5G)wireless mobile communication standard has been released.5G networks efficiently support enhanced mobile broadband traffic,ultra-reliable low-latency communication traffic,and massive machine-type communication.However,a major challenge for 5G networks is to achieve effective Radio Resource Management(RRM)strategies and scheduling algorithms to meet quality of service requirements.The Proportional Fair(PF)algorithm is widely used in the existing 5G scheduling technology.In the PF algorithm,RRM assigns a priority to each user which is served by gNodeB.The existing metrics of priority mainly focus on the flow rate.The purpose of this study is to explore how to improve the throughput of 5G networks and propose new scheduling schemes.In this study,the package delay of the data flow is included in the metrics of priority.The Vienna 5G System-Level(SL)simulator is a MATLAB-based SL simulation platform which is used to facilitate the research and development of 5G and beyond mobile communications.This paper presents a new scheduling algorithm based on the analysis of different scheduling schemes for radio resources using the Vienna 5G SL simulator.