Mobile Ad Hoc Network Based Video Service Cooperative Transmission And Quality Evaluation

As the resolution of videos on the Internet is becoming higher and higher,users' demand for watching video on mobile devices also grows greater.However,the limitation of network bandwidth of domestic wireless network and insufficient terminal resources often cannot meet users' needs to watch high-definition video in real-time on their mobile devices.In this kind of situation,this thesis proposed a video service cooperative transmission mechanism based on mobile ad-hoc network to make use of the characteristics of the nodes' ability of communicating with each other and to make full use of those nodes' resources and the bandwidth resources between those nodes to achieve video service cooperative transmission when the network conditions are relatively poor.At the same time,considering the particularity of video services,this thesis also studied the video quality evaluation method based on user's subjective experience,hoping to put forward more reasonable end-to-end service quality evaluation factors and to further improve the quality and effect of video service cooperative transmission.The research achievements of this thesis include:first,modeled the video service and mobile ad-hoc network to be graphics;Second,defined the service utility and cost evaluation parameters as efficiency index and cost index,and solved the problem with the targets of utility maximization and cost minimization;Then,the concept of multi-device composition set and candidate multi-device composition set were introduced,multi-devices composition and maintenance framework and multi-devices composition and maintenance algorithm were also proposed and the effect of the algorithm was verified by simulation experiment;Finally,based on the goal to improve users' quality of experience during the process of video cooperative transmission,introduced user preference as an subjective experience impact parameter in the video service assessment phase and quantified the relationship between the parameter and the quality of users' experience with subjective experiments,and finally verified the validity of the parameter through simulation experiments.