Research On Relay Multipah Transmission Methods For Real-time Video Based On Cloud Service

With the development of live streaming,the demand for live delay and interaction is increasing.Interactive live streaming technology has become the standard configuration of the real-time video industry.How to improve network delay performance has become the key factor in real-time video applications to ensure the quality of user interaction experience and become first-class in the industry.Although the wireless access conditions can be selected,the drop of real-time video transmission performance in long-haul,cross-area,and cross-network situation becomes very noticeable.Focusing on this issue,we utilize the good network infrastructure of cloud service and do some researches on the methods of real-time video relay multipath transmission based on cloud services.In the meantime,we study the issues elicited under this application model to improve the relay multipaths transmission performance of real-time video.In view of the good quality and high path redundancy of the Cloud Service transmission network,this paper analyzes the network architecture and transmission characteristics of the data center,takes into consideration the existing software and hardware conditions and the characteristics of the multi-path transmission technology,and proposes a relay multi-path transmission method based on DCell architecture,which can fully utilize the path resources of the data center and improve the the performance and user experience quality of real-time video services in long-haul,cross-area and cross-network situation.The experimental results show that the relay multipath transmission method proposed in this paper can effectively improve the performance of long distance and trans regional transmission.For the problem of bursty background traffic and dynamic change of link available bandwidth in data center network,a relay data distribution scheduling algorithm with time delay minimization is proposed under the relay multipath transmission architecture.By evaluating the path quality and estimating the average delay of multipath transmission,the flow dynamic allocation is carried out to enhance the interaction and robustness of real-time video transmission.The simulation results show that the proposed relay data distribution scheduling algorithm can effectively reduce the average transmission delay and the maximum transmission delay in the transmission process and improve the real-time and interactivity of the video stream.For the possible incast packet loss at the aggregation node in data center multipath transmission,this paper builds a model for multipath transmission under the Map/Reduce mode based on MPTCP and MPUDP,analyzes the relationship between the available bandwidth,the time interval of the data packet transmission,the size of the buffer and the incast packet loss.After that,we propose a pacing adjust algorithm to mitigate the burst of data and alleviate the incast problem by adjusting the packet transmission time interval.Simulation results show that the proposed algorithm can effectively alleviate the bursts of data and enhance the throughput under high concurrency.