Hidden terminal and Exposed terminal

最新推荐文章于 2023-01-10 01:39:10 发布

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本文探讨了无线网络中两种常见的干扰问题：暴露节点问题与隐藏节点问题。暴露节点问题指当一个节点正在进行数据传输时，另一个节点由于载波监听误以为信道空闲而尝试发送数据，实际上会造成干扰。隐藏节点问题则是指两个节点试图同时向同一目标节点发送数据，但由于其中一个节点无法检测到另一个节点的存在，导致数据包冲突。

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Exposed terminal

[figure from https://en.wikipedia.org/wiki/Exposed_node_problem]

S1 is transmitting packages to R1, S2 is prevented from sending packages to R2, because the carrier sense tells R2 it will interfere with the transmission of S1. But in fact, such an interference would not occur because S2 is sending packages to R2, not R1.

Hidden terminal:

[figure from https://en.wikipedia.org/wiki/Hidden_node_problem]

There is a transmission from A to B. At the same time C attempts to send packages to B. Because A is outside of the signal range of C, the carrier sense will tell C it's OK to initial a transmission to B. But in fact, such a transmission will interfere the transmission from A to B. In this case, A is called the hidden terminal of C.