Research On VR Wireless Optimized Transmission Based On WiFi

With the wide application of virtual reality(Virtual Reality,VR),how to improve the VR service experience of mobile user terminals has become a current research hotspot in wireless communications.In today's mainstream wireless systems,5G systems have the advantages of high bandwidth and low latency,making the transmission of VR services on 5G a reality.But on the other hand,although the transmission rate of WiFi systems for indoor coverage(main VR application scenarios)has been greatly improved,it has not been greatly improved in transmission delay.Therefore,how to improve the VR service quality of the WiFi system is of great significance and practical value.This article relies on the cooperation project between the laboratory and a well-known domestic company to conduct in-depth research on VR over WiFi.The main work includes:(1)In response to the VR service transmission requirements of users of WiFi5 devices,this paper proposes to use the "multi-chip cooperation" to connect the data between the interfaces on the existing dual-interface dual-channel WiFi5 devices,and realize the adaptive cross-carrier equalized transmission of VR transmission data which is based on the air interface statistical model,and proposed a cross-carrier receiving scheme based on IP ID to improve transmission bandwidth.In addition,this article perform "cross-carrier redundancy backup" and "fast cross-carrier retransmission" for VR transmission data to ensure the retransmission reliability and retransmission delay of VR services.And improve the stability and processing performance of WiFi5 devices by means of resource optimization and low overhead lock management for the system.(2)In response to the VR service transmission requirements of users of WiFi6 devices,this paper designs a time fragment information field(Fragment info)for time slices and user information indication in downlink OFDMA.And based on this field,we propose a new WiFi6 downlink resource scheduling mode: use the Fragment info field to make transmission instructions for the time fragments in the allocated RUs to achieve full utilization of idle time-frequency resources;multi-user bundling retransmission are achieved by actively allocating RUs and using the Fragment info field to time-slice the RUs to improve the transmission delay performance and time-frequency resource utilization of VR multi-user retransmissions.And through the introduce of adaptive transmission mode selection based on VR new transmission traffic and retransmission traffic,so as to more efficiently use OFDMA downlink time-frequency resources.(3)In response to the higher-quality VR service transmission requirements of users of future WiFi7 devices,this paper proposes to implement a new transmission channel and dedicated channel management mechanism for WiFi7 devices with dual-band full-duplex function which is based on contention access mode: only new transmissions are done on the new transmission channel by turning off BA and BAR;all retransmission data,BA,BAR,and emergency transmission data(VR new transmission data that may time out due to queuing)are adaptively transmitted on the dedicated channel.This not only improves the system transmission bandwidth,but also ensures the system reliability,average transmission delay and worst-case delay.Finally,combined an access type delay statistical model and a greedy algorithm,we proposed an "adaptive suitability frame queue scheduling" algorithm based on extended access type to ensure the transmission delay of VR services.The research content of this article has important reference value for improving indoor wireless VR service transmission,especially WiFi VR service transmission.