Research And Implementation Of The Binarization Of WebRTC Signalling Based On CoAP

The WebRTC framework,emerging as the web-based real-time multimedia communication technology for the Internet,is widely supported by main browsers and system platforms.CoAP is defined by Internet Engineering Task Force IETF to replace the application layer protocol HTTP in M2M/IoT applications.The combination of WebRTC technology and CoAP is an important way to realize IoT real-time multimedia communication.Aiming at the characteristics of functional modules and complex technology in WebRTC framework,this paper focuses on the application scenario of WebRTC signaling in the restricted network environment based on CoAP,and studies the binarization of WebRTC signaling.The research contents include:first,using the definition of CoAP and setting the field values reasonably to make the CoAP request/response mechanism simplified in the WebRTC application;second,through the reasonable binarization of the SDP message to implement the binarization of WebRTC signaling.The following major improvements are proposed to improve WebRTC signaling based on CoAP,including:1)to simplify signaling processing of signaling servers by defining query-g and query-1 parameters through the CoAP protocol's Uri-query option to reduce WebRTC signaling transmission delay;2)to make the CoAP protocol Token field empty to achieve the "request/response" mechanism to simplify in order to reduce the resource constrained node computing storage resources overhead;3)to use Huffman coding,fixed length Coding to binaryize the SDP description to realize the compression of WebRTC signaling messages;4)to research and implement the coding efficiency optimization technology of Huffman coding and fixed-length coding in WebRTC applications to optimize the compression efficiency of WebRTC signaling messages.In this paper,six groups of experiments are designed to verify the rationality of these improvements from the perspectives of reliability,computational efficiency,text compression efficiency and information transfer efficiency.The feasibility of binarization of WebRTC signaling based on CoAP is proved.The results show that CoAP-based binary WebRTC signaling has higher efficiency.