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1.前言以ARPA网*(美国远景研究计划局计算机网)为首的计算机网络取得了惊人的发展,其中占主流的交换方式是分组交换方式。这是由于这类系统一般是由若干分段的信息源组成,故相互间必须有效地共用通信资源。将这种分组通信的概念首先用于无线通信的是夏威夷大学的ALOHA系统。随后出现了多级中继分散型的正式的分组移动通信系统,如ARPA计算机网。无线分组通信系
1. Introduction The computer network led by ARPA Network * (NASA Computer Network) has seen phenomenal growth, with the dominant mode of exchange being packet switching. This is because such systems generally consist of segmented sources of information and therefore must effectively share communications resources with one another. The concept of this packet communication, first used for wireless communications, is the University of Hawaii’s ALOHA system. Subsequent emergence of multi-level relay decentralized formal packet mobile communications systems, such as ARPA computer network. Wireless packet communication system