一种适用于SCTP垂直切换的拥塞控制方法  

A congestion control scheme used in SCTP based on vertical handover

作　　者：李会霞 彭双和[1] 魏慧琴[1] LI Huixia;PENG Shuanghe;WEI Huiqin(Basic Teaching Base of School of Computer and Information Technology,Beijing Jiaotong University,Beijing 100044,China;School of Computer and Information Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学计算机与信息技术学院基础教学基地

出　　处：《中国科技论文》2019年第7期732-736,共5页China Sciencepaper

摘　　要：针对具有多家乡特征的流传输控制协议(stream control transmission protocol,SCTP)在垂直切换过程中的拥塞控制问题,提出网络状态感知的SCTP拥塞控制增强方法(network-aware SCTP,NA-SCTP),利用现有SCTP中的心跳消息(Heartbeat)来探测备用链路的时延和带宽。切换发生后,根据探测到的时延和带宽值对备用链路的拥塞控制参数(拥塞窗口和重传定时器)进行适应性调整。仿真结果表明,NA-SCTP能及时准确地探测网络实际状态,对备用链路的拥塞控制参数进行适应性初始化,显著提高了垂直切换过程中的传输性能。所提方法可保持现有SCTP协议的拥塞控制机制,具有理论研究意义和实际应用价值。The congestion control problem of stream control transmission protocol(SCTP)based on vertical handover was firstly analyzed.Then the network-aware SCTP(NA-SCTP)was proposed,which can make use of the Heartbeat message in the SCTP protocol to probe the latency and bandwidth of back-up links,in order to adjust the congestion control metrics(congestion window and retransmission time-out)accordingly.Simulation results demonstrated that NA-SCTP can aware the actual network condition and improve the performance of transport layer effectively.Besides,NA-SCTP is easily implemented and it maintains the operations of basic SCTP to the utmost.The proposed method can keep the existing congestion control mechanism of SCTP protocol as far as possible,with theoretical significance and practical value.

关 键 词：异构网络 垂直切换 流传输控制协议 拥塞控制 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]