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Exposed node problem

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The exposed terminal problem occurs in wireless networks when a terminal is delayed in sending data because it thinks it isn’t okay to send data.

Consider a scenario with four wireless terminals: A, B, C and D. A is in range of B, B is in range of A and C, C is in range of B and D and D is in range of C. When B is transmitting data to A, C also hears the data transmission. If during this transmission, C wants to send data to D, it would be able to, because D cannot hear the data transmission from B. Even though it is all right for C to transmit data to D, while B is transmitting to A, it won’t because it hears B’s transmission when it senses the medium and doesn’t know that D isn’t receiving the transmission.

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