Research On Video Transmission Scheduling Algorithms Based On LTE

With the continuous development of science and technology,wireless mobile communication technology is developing rapidly.At the same time,as a result of the increasing popularity of video applications,more and more video data need to be transmitted in the network.Due to the limitation of available bandwidth,the change of channel state and the burst of video data,it is still a big challenge for current LTE(Long Term Evolving)network to transmit video data well.In the process of video transmission,resource scheduling is a greatly important segment.If suitable resource scheduling algorithm is adopted in video transmission,the performance of video transmission can be significantly improved.In this paper,we focus on the resource scheduling algorithm of video transmission.Firstly,we introduce the background of LTE.Secondly,the main key technologies used in LTE are discussed.Then we describe the wireless resource management in LTE.Finally,two improved algorithms are proposed to overcome the shortcomings of existing resource scheduling algorithms.Firstly,we propose the LWIF(Largest Weighted Importance First)algorithm,which can be regarded as an improved resource scheduling algorithm based on the M-LWDF(Modified Largest Weighted Delay First)algorithm.When calculating users' priorities,the LWIF algorithm considers not only the QoS(Quality of Service)constraints of the application layer,user throughput,but the importance of video packets(in other words,video packet's importance for recovered video quality).Therefore,in the video transmission,more important data packets can obtain greater priority,thus the system can guarantee the priority transmission of these data packets.The simulation results have shown that the LWIF algorithm has significant gains compared with the traditional resource scheduling algorithm in terms of packet loss rate,throughput and received video quality.Then combined with the EXP-Rule(Exponential/PF Rule)algorithm,we further improve the LWIF algorithm,and propose the M-LWIF(Modified LWIF)algorithm.When calculating users' priorities,based on the LWIF algorithm,the M-LWIF algorithm additionally considers the video packet size.Finally,the performance of the M-LWIF algorithm is validated from the network transmission performance and the received video quality.