Research On Differential Data Transmission Based On IDNC And D2D

In recent years,mobile communication technology has developed rapidly,and mobile smart terminals are becoming more and more popular.On the one hand,data flow has exploded,and the growing of mobile data flow which is mainly based on multimedia information is fastest;on the other hand,the gap between terminal processing capabilities has gradually increased.Therefore,under the condition of the explosion of data flow,the increasing gap in terminal processing capacity,and the difference in link quality,solving the real-time differential data transmission problem caused by the difference in link quality and the difference in terminal processing capacity,is of great significance for providing users with better services.This thesis first introduces some key technologies for solving the problems raised in this thesis,including network coding technology,instant decoding network coding technology,and scalable video coding technology.Next,this thesis studies and solves differential data transmission after introducing D2D transmission in the traditional base station transmission network.Firstly,the link quality is different because of the different location of the mobile terminals.This difference in link quality will lead to the difference in data transmission.Secondly,for D2D networks,when the mobile terminal participates in retransmission,in order to ensure that the network has a certain life and stability,each terminal has a different probability of participating in retransmission.Based on the above two factors,this thesis proposes a maximum weighted packet selection algorithm based on channel quality and remaining energy of terminals(MWP-QE).In this algorithm,not only the base station and D2D data retransmission methods are simultaneously performed,but also the weight of the data packet is defined based on the channel quality and the remaining energy of the terminals.the data packet with the largest weight is selected iteratively,and then the selected data packet is binary XOR coding,the retransmission of the encoded data packet by the ending.This algorithm effectively solves the differential data transmission problem caused by the difference in link quality in the D2D and base station mixed communication network,while ensuring the life and stability of the network as much as possible.Finally,it mainly studies the real-time differential data transmission problems caused by the difference in terminal processing capabilities and channel quality.Considering the characteristics of strict sequential decoding of the video layer,the difference in channel quality and the difference in terminal processing capabilities,this thesis proposes a maximum weighted packet selection algorithm based on terminal classification expansion(MWP-CE).When searching for the largest clique,the algorithm classifies the terminals and then expands the terminals.At the same time,this algorithm defines the weight of the data packet based on the channel quality,adjacency and deadline comprehensively.Then selects the data packet with the largest weight.Finally,the selected data packets perform binary XOR coding and retransmits the encoded data packet.On the one hand,the algorithm ensures low latency of terminals with low processing capabilities,and ensures that all terminals can receive basic layer data;On the other hand,it increases the proportion of terminals that successfully receive all datas which they need before the deadline.