| With the rapid development of mobile communication networks and the gradual popularization of smart phones,the information society has gradually begun to enter the mobile Internet era.Watching streaming video through the mobile communication network has gradually become a popular phenomenon.This makes the network traffic gradually shift from PC side to mobile side.Mobile streaming service has become a heavyweight application on the Internet because of its high bandwidth requirements,strong real-time requirements,and has been one of the most demanding mainstream applications on the mobile Internet.At present,wireless streaming service has become one of the biggest sources of mobile traffic,and the surge of mobile traffic poses a huge burden to the current mobile communication network.Traditional mobile streaming media systems are generally based on the base station(baseestation-to-device,B2D)network access mode,in which the user can only obtain video service through the base station or the wireless access point.While with the rapid development of the Internet,this architecture is increasingly hard to meet the user's streaming media service demands,which limites the development of mobile streaming media service.Therefore,to enhance the streaming media service system scalability and maximize the offloading ratio of cellular traffic as the goal,by converging D2D(device-to-device)and B2 D communication mechanism as a technical means and by optimizing the cache strategy of the relay node in multi-hop video transmission as a key technical isuue,this paper studies on the D2 D collaborative streaming media service technology,designs and implements a prototype system of D2 D collaborative streaming service system.Finally,a test about the prototype system's cellular traffic offloading ratio is done in the real environment.The test results show that the D2 D collaborative streaming service system can effectively offload the cellular traffic and reduce the load of the base station. |
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