C is not replying Congestion may be? I backoff... (10) F is not replying Congest
ID: 3723699 • Letter: C
Question
C is not replying Congestion may be? I backoff... (10) F is not replying Congestion may be? I backoff 6(10) RTS (8) I can listen RTS but can RTS (8)* NOT reply. (9) Now I can reply to D for old RTS with RRTS (12) CTS (3) RTS (^).. ....P' (FI can NOT listen any thing any more I heard CTS from B hence my transmission is defemed tillDate received. Sending ACK (11) data is to be received (4) Sending data (7) S (9) DS tells me that what is data length and RTS/CTS exchange is a succesS Hence I defer my transmissions til data ends. (6) RTS heard from A. Hence my transmission is deferred till CTS should be received (2) I have heard now CTS Hence my transmission is defered till data is to be received (4) RTS heard from A. Hence my transmission Is deferred till CTS should be received (2) An Example about working of MACAWExplanation / Answer
In step 1, A sends the RTS which is heard by it's neighbours B,E,F who defer their transmission until they also hear a CTS.
In step 3, B sends a CTS to A which is heard by the neighbours of B that is, E and C and they defer their transmission until data is also received. which is specified by step 4.
After receiving the CTS, A begins transmitting data in Step 5.
In step 6, The neighbour F who could not listen to B's CTS hears the data transmission and defers its transmission.
Till now C, E and F are waiting for the transmission of the data to be complete.
The transmission of data from A to B begins in Step 7.
Now observe carefully, only C E and F are on hold because they have heard CTS or DS. bUT THE REMAINING NODES, g AND d, ARE FREE TO TRANSMIT.
In step 8, nodes D and G iniate a RTS to nodes C nd G.
Now C has been waiting for data transmission to end however it does not receive any data segments since it is not a neighbour of A. That is why, it can listen but can't reply.
F is however the neighbour o A and can unfortunately overhear the data that is being transmitted and hence is completely blocked from transmitting.
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