Research On Services Pushing Technologies In Wireless Converged Network

With the rapid evolution of Internet technology and the rapid increase of the number of terminals,data traffic is experiencing explosive growth,and users are increasingly demanding the timeliness and accuracy of communication.However,it is difficult to meet the needs of users by relying solely on existing cellular networks.The pushing technologies of hot services based on the integration of wireless broadcasting network and cellular network is an effective solution.This paper is divided into two parts: one is the unequal error protection pushing technology based on Quality of Experience(QoE),and the other is the pushing technology of hot services based on layered division multiplexing(LDM)in high-speed scenarios.Firstly,taking news services as an example,this paper studies the services priority of text and pictures and the evaluation model of QoE with different services recovery rates.We get news samples with different recovery rates through simulated transmission,and invite users to score the samples on the scoring platform.According to the user rating data,linear fitting and non-linear fitting are used to model the rating data,and the accuracy and practicability of the model are verified.The test results show that in news services,because text contains a large amount of information and takes a very small proportion,text has a higher priority than pictures;in contrast,the nonlinear fitting model has a higher accuracy and accuracy,and the complexity is also acceptable.From the three-dimensional model,we can see that text and picture have different contributions to QoE.Even if the picture is lost completely in the transmission process,as long as the recovery rate of text is higher than a certain threshold,user QoE can still reach a higher value.In addition,text can provide more benefits to user QoE on the premise of improving the same recovery rate.Then,according to the established services recovery rate-QoE model and taking QoE as the evaluation index,this paper studies the unequal error protection push technology of web browsing service.Considering the good adaptability and low complexity of fountain codes to wireless broadcasting channels,even in very poor channel conditions,as long as the number of coding packets is enough,the receiver can always have good decoding performance.For this reason,this paper proposes an unequal error protection push scheme based on fountain code.We take the traditional fountain code scheme as a contrast,and verify the performance of the proposed scheme through simulation and experiment.In the experiment,the data encoded by fountain is transmitted in the real channel to get the experimental sample,and then the user is invited to score it.The simulation and experimental results show that the proposed unequal error protection scheme can greatly improve user QoE under the same additional overhead.In addition,by comparing the experimental results with the predicted results of QoE model,it can be found that in most cases they are basically consistent,which further verifies the accuracy of the QoE model built in this paper.Then,in the high-speed scenario,based on the LDM in international standard ATSC3.0,a pushing scheme of hot services is proposed.Firstly,we analyze the performance indicators of different types of hot services,then use the basic layer of broadcasting to transmit real-time streaming media services,and use the enhancement layer to push non-real-time hot services.The proposed scheme is mainly aimed at maximizing the equivalent throughput of the enhancement layer.In order to maximize the equivalent throughput of the enhancement layer,we propose a greedy algorithm based on heat and a greedy algorithm based on heat and fairness to solve the optimization problem.The simulation results show that the greedy algorithm based on heat has a significant performance improvement in the equivalent throughput provided by the broadcasting base station for the train running in this direction when considering only one-way operation;the greedy algorithm based on heat and fairness has a great improvement in fairness when considering the two-way operation,at the cost of reducing the broadcasting base station to a certain transport.Equivalent throughput provided by directional trains.Finally,the above research contents are summarized and the future research directions are prospected.