I think you have understood in some different way.
by rakeshchinni - 6/6/12 11:56 PM
In Reply to: What is CBR? by R. Proffitt
Let me explain it again,
All the nodes are present connected via wireless subnet.
An application is present between node 1 and node 2.
Let's consider that node 1 got it's chance to send then it has started sending data packet.
Let's consider the data frame is sent by the node 1.
Any node that is sending a frame, it won't send it on a particular interface because node don't know on which interface the destination is present.
Hence, from the previous paragraph we can decide that the data frame sent by the node 1 will get received at all the other nodes that are near to it or the nodes that can hear node 1.
Let's consider the node 2 and node 3 in the range of the node 1. That means node 2 and node 3 will receive the data frames.
Now on which basis node 2 and node 3 will treat this frame.
there are two cases,
1. node will receive the whole frame and then it will decide whether to discard the frame or not.
2. node will receive only header part of the frame and then it will decide whether to discard the frame or not.
In the case 1 the packet discard is decide at the higher layers.
Consider node is taking the case 2, In this case the packet is discarded in MAC layer if the frame is not related to that node.
1. If the frame received is CTS or RTS or ACK, we have to receive it and process it because, we need to set our own NAV(Network Allocation Vector).
2. Other than CTS or RTS or ACK is DATA.
There is no need to receive the frame which is nor DATA frame.
My doubt is, what are the parameters that we have to check while i receive the DATA frame.
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