Research On Transmission Quality Assurance Of Screen Casting And Game Services In WiFi System

Screen-casting service and game service are very important services in the WiFi scenario.Screen-casting technology enables screen sharing and data intercommunication between different devices,while game services enrich people's leisure life.However,both screen-casting service and game service put forward high requirements on transmission delay,packet loss rate and throughput rate of service messages.The existing WiFi technology can hardly meet these requirements,which gives people a bad experience.Aiming at the demand of high-quality transmission of screen-casting service on WiFi link,this thesis designs a new screen-casting transmission scheme at the bottom of the wireless link,which is based on the transmission mechanism and message characteristics of the screen-casting technology.The feedback retransmission scheme is used to ensure the transmission reliability of screen-casting message,and the scheduling transmission scheme is used to realize low-latency and rapid transmission of screen-casting service.Based on the air interface quality monitoring,the adaptive encoding of screen-casting message is carried out to improve the transmission throughput of screen-casting service.The Bluetooth channel and the WiFi channel are heterogeneously integrated to realize full duplex transmission of screen-casting service.At the same time,aiming at the demand of high-quality transmission of game services on the WiFi link,on mobile terminal devices that support dual-frequency dual-transmit functions in hardware,this thesis makes full use of the transmission resources of dual-frequency and multi-queues,and designs an efficient message encapsulation mechanism for packet scheduling and retransmission,so as to ensure the transmission reliability of game services.Then,based on the encapsulation mechanism and feedback information,the transmission quality measurement mechanism of each hardware queue under dual frequency is designed.Based on the link quality information obtained from the measurement,a dual-frequency scheduling transmission mechanism and a dynamic traffic scheduling mechanism are further designed to jointly ensure the low-latency transmission of game services in the complex WiFi environment.Regarding the design schemes proposed for the transmission quality assurance of the screen-casting service and the game service,this thesis has carried out the architecture design and code realization on both Linux platform and Windows platform,and performed performance verification.The verification result proves that after the quality assurance mechanism proposed in this thesis is used to process the service messages,the transmission delay fluctuation of screen-casting service and game service is significantly improved,the packet loss rate is reduced,and the quality of service transmission on the WiFi link is successfully guaranteed.