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Question: Why do Hidden and Exposed terminal problem arise? How would you propose to solve it.
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Subject: Mobile Communication and Computing

Topic: Wireless Local area Network

Difficulty: Low

mcc(16) • 253 views
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modified 3 months ago  • written 4 months ago by gravatar for meghalikalyankar.kgiet meghalikalyankar.kgiet10
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Hidden and exposed terminal problems: The reason for these two problems is the broadcast nature of the radio channel, namely, all the nodes within a node’s transmission range receive its transmission.

Hidden terminal problem – two nodes that are outside each-other’s range perform simultaneous transmission to a node that is within the range of each of them, hence, there is a packet collision.

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Exposed terminal problem – the node is within the range of a node that is transmitting, and it cannot transmit to any node.

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Solution

  1. Multiple Access Collision Avoidance avoids the problem of hidden terminals

o A and C want to send to B

o A sends RTS(Ready to Send) first

o C waits after receiving CTS (Clear to Send) from B

enter image description here

  1. MACA avoids the problem of exposed terminals

o B wants to send to A, C to another terminal

o now C does not have to wait for it cannot receive CTS from A

enter image description here

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modified 3 months ago  • written 3 months ago by gravatar for meghalikalyankar.kgiet meghalikalyankar.kgiet10
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