基于轻量级CoAP协议的需求响应业务承载机制及优化

Demand Response Business Bearing Mechanism and Optimization Based on Lightweight CoAP Protocol

用户侧资源受限的需求响应(demandresponse,DR)设备采用基于HTTP/XML的OpenADR协议承载DR业务方式,会产生开销较大、延时较高等问题。为解决该问题,利用轻量级协议CoAP(constrainedapplicationprotocol)替代HTTP协议来完成需求响应通信过程,并设计了基于CoAP的DR通信架构。同时针对CoAP协议拥塞控制方式过于简单,面向高并发DR业务可能会造成网络拥塞、响应时延较长等问题,提出了一种基于网络状态的自适应拥塞控制方法。仿真结果表明,CoAP协议可有效提高DR实时响应能力、降低开销,所提出的拥塞控制算法可缓解网络拥塞问题,从而提升了CoAP协议承载DR业务的性能。

In order to solve the problems of higher overhead and delay produced by HTTP/XML based OpenADR protocol when carrying demand response business in resource-constrained demand response(DR)devices,lightweight protocol CoAP(constrained application protocol)is used instead of the HTTP protocol to complete demand response communication process and a DR communication architecture based on CoAP is designed.Because CoAP originally provides only a very simple congestion control mechanism,it may cause network congestion and longer response delay when encountering high concurrency DR business,so an adaptive congestion control mechanism based on network state is proposed.Simulation results show that CoAP protocol can effectively improve DR real-time response capability and reduce overhead.And the proposed congestion control mechanism can alleviate network congestion problems and improve the performance of CoAP protocol carrying DR business.