IP多播在IEEE1394等时通道中的传输  

Method for IP Multicast over IEEE 1394 Isochronous Transmission

作　　者：万月亮[1] 史洁琴[2] 丛向超[2] 

机构地区：[1]北京工商大学计算机与信息工程学院,北京100048 [2]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《计算机仿真》2012年第8期154-158,共5页Computer Simulation

基　　金：863项目数据活化关键技术研究(2011AA010502)

摘　　要：利用1394等时通道传输IP多播信息,关键是解决IP多播地址和1394等时通道的映射问题。MCAP(Multicast Chan-nel Allocation Protocol)采用集中控制管理的方法实现,通道利用率比较高,但算法复杂,实现难度大。为此提出一种基于哈希算法的多播通道分配方法(Hash Multicast Channel Allocation Protocol,HMCAP),利用哈希函数实现IP多播地址和1394等时通道的映射。HMCAP是一种自动确定性的方法,减小了通道分配时间,算法简单易于实现。通过对HMCAP和MCAP两种方式下的碰撞概率进行分析比较,随着加入通讯的多播组数量增加,HMCAP和MCAP之间的差距在减小,HMCAP可以作为一种多播通道分配实现方式。The key to transfer IP muhicast datagrams over isochronous channel of IEEE1394 is to solver the map- ping problem between IP muhicast address and IEEE1394 isochronous channel. A muhieast channel allocation scheme called Muhicast Channel Allocation Protocol（MCAP） was proposed. Using a centralized control, the MCAP can reduce the possibility of channel collisions, but it is more complex and difficult to be implemented. A new algo- rithm was proposed, called Hash Muhieast Channel Allocation Protocol （HMCAP）. Hash function was used to com- pute a channel number from the IP multicast address, and HMCAP is an automatic and deterministic method which reduces the time of distributing channel. By analyzing the collision probabilities of HMCAP and MCAP respectively, the channel utilization rate of HMCAP was lower. As IP muhieast addresses increases, the difference between HM- CAP and MCAP diminishes. The number of IP multicast address is much greater than the channel number of IEEE 1394, so HMCAP can be a choice to realize the muhicast channel allocation.

关 键 词：多播 等时传输 碰撞概率 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]