Packet Switching in Radio Channels : Part Il-The Hidden Terminal Problem in Carrier Sense Multiple-Access and the Busy-Tone Solution
Packet Switching in Radio Channels : Part Il-The Hidden Terminal Problem in Carrier Sense Multiple-Access and the Busy-Tone Solution
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摘要：我们考虑一群终端通过分组交换多址无线电信道与中心站通信。用作复用这些终端的方法的载波侦听多路访问（CSMA）[1]的性能高度依赖于每个终端侦听信道上任何其他传输的载波的能力。存在许多情况，其中一些终端彼此“隐藏“（因为它们在视线之外或范围之外）。在本文中，我们表明，隐藏终端的存在显着降低了CSMA的性能。此外，我们介绍和分析了忙音多址（BTMA）模式作为一个自然的扩展的CSMA消除隐藏终端的问题。给出的带宽利用率和数据包延迟的数值结果示出，说明BTMA与隐藏终端执行几乎以及CSMA没有隐藏终端。
Abstracf-We consider a population of terminals communicating with a central station over a packet-switched multiple-access radio channel. The performance of carrier sense multiple access (CSMA) [l] used as a method for multiplexing these terminals is highly dependent on the ability of each terminal to sense the carrier of any other transmission on the channel. Many situations exist in which some terminals are " hidden " from each other (either because they are out-of-sight or out-of-range). In this paper we show that the existence of hidden terminals significantly degrades the performance of CSMA. Furthermore, we introduce and analyze the busy-tone multiple-access (BTMA) mode as a natural extension of CSMA to eliminate the hidden-terminal problem. Numerical results giving the bandwidth utilization and packet delays are shown, illustrating that BTMA with hidden terminals performs almost as well as CSMA without hidden terminals.