基于VxWorks的PIM-SM协议的改进设计  

Modified Design of PIM-SM Protocol Based on VxWorks

作　　者：张成 吴明曦 刘小娟 毛天立 ZHANG Cheng;WU Mingxi;LIU Xiaojuan;MAO Tianli(Wuhan Zhongyuan Electronics Group Co.,Ltd.,Wuhan Hubei 430205,China)

机构地区：[1]武汉中原电子集团有限公司,湖北武汉430205

出　　处：《通信技术》2023年第12期1383-1389,共7页Communications Technology

摘　　要：简要介绍了互联网组管理协议(Internet Group Management Protocol,IGMP)和协议无关组播的稀疏模式(Protocol Independent Multicast-Dense Mode,PIM-SM)协议的基本原理。结合移动无线自组网的需求和VxWorks 6.9操作系统的特点,对IGMP协议和PIM-SM协议进行了适配和改进。首先,给出了IGMP协议的查询器选举和Query消息的接收者的改进方法;其次,扩展了PIM-SM协议在单接口和路由表项不写入内核等情况下的应用场景,设计了一套多任务处理方案,通过轮询实现了内核信令的触发(如“IGMPMSG_NOCACHE”类型的信令)和组播数据转发调度的功能;最后,通过搭建两对“主机-电台”的实测环境,实现了消息交互功能,验证了该方案的可行性。In this paper,the basic principles of the IGMP(Internet Group Management Protocol)group management protocol and the PIM-SM(Protocol Independent Multicast-Dense Mode)multicast routing protocol are briefly introduced.According to the requirements of mobile Ad hoc network and the features of the VxWorks 6.9 operating system,the IGMP and PIM-SM protocol are adapted and modified.First,the improved method of querier election and receiver of Query message in IGMP is presented.Then,the application scenarios of the PIM-SM protocol in cases such as single interface and routing table entries not written to the kernel are extended.A set of multi-task processing scheme is designed to implement the functions of kernel signaling triggering(such as IGMPMSG_NOCACHE signaling)and multicast data forwarding scheduling through polling.Finally,through setting up two pairs of"host-radio"test environments,the message interaction function is implemented and the feasibility of the scheme is verified.

关 键 词：IGMP PIM-SM VXWORKS 移动无线自组网 

分 类 号：TN924[电子电信—通信与信息系统]