Abstract Research And Implementation Of DASH-based P2P Video

In recent years,a dynamic adaptive stream(MPEG-DASH)technology gradually rise,the technology can be dynamically selected in a variety of bit rate resources according to changes in the network environment.But this technology based on the C / S structure,there are server load bottlenecks.And the existing P2 P technology can just become the solution to the problem.This paper analyzes the principle of DASH technology and P2 P technology and the existing several P2 P video broadcast models,and proposes a video distribution model composed of three layers of server,super node and common node.Then,based on the model design and implementation of DASH-based P2 P video distribution system,and detailed description of the nodes of the system structure,node management mechanism,the interaction between nodes and data transmission process and related algorithms related to the realization.In the system,each node is both the requestor and the provider of the data,and has the following characteristics:(1)The server only needs to manage the super node,and the common node is managed by the super node,which reduces the load pressure of the server;(2)The super node provides the resource retrieval service so that the node can obtain the new partner quickly;(3)The nodes in the system are divided according to the network and physical location,and the transmission delay between nodes is smal er;(4)Defining a delay parameter in the partner selection mechanism to make the selected partner more reliable;(5)The two-level scheduling algorithm is adopted to make the node realize the bit rate adaptive.The simulation results show that the system model can add DASH adaptive technology to the user nodes without changing the P2 P data transmission mode,and has advantages in terms of load balancing,data transmission delay,bandwidth utilization and the timeliness.