[Ns-developers] Question about the Wireless Channel, Mac_802.11Ext, and PhyExt

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I am giving the answer below ur enquiry....

--- On Fri, 10/2/09, Tommy Huy Nguyen <huynguyen531 at gmail.com> wrote:

> From: Tommy Huy Nguyen <huynguyen531 at gmail.com>
> Subject: [Ns-developers] Question about the Wireless Channel, Mac_802.11Ext, and PhyExt
> To: ns-developers at ISI.EDU
> Date: Friday, October 2, 2009, 5:51 PM
> Hi,
> I'm currently implementing a new protocol using your
> Physical and Mac802.11
> extensions. I have a few technical questions relating would
> appreciate any
> kind of help.
> 
> 1) There are two packets with two different sizes. 
> The first packet being
> sent is a lot bigger than the second packet. Is it possible
> for the second
> packet to arrive at the designated node before the first
> packet?
> 
Your description is superficial.What kind of topology,agent,routing u are considering ?
Any way, If all nodes are in the sensing range, then there should be one and only one transmission in the network at a time. The packet which will grab the channel first, will be transmitted first. Next TX initiation will start as soon as the NAV timer expires and CS becomes clear. Big packet and small packet is not the main issue.


> 2) Node A sends a big packet to Node B. Node B sends a
> small packet to Node
> A before Node A finish transmitting. Is it possible for
> Node B to send a
> packet to Node A, while Node A is still transmitting? If
> so, is it possible
> for Node A to receive Node B's small packet before finish
> transmitting the
> big packet?
> 

 Pls see the above answer. By the way ,you can go through the basic principles of 802.11 DCF literature.
> 
> Thanks,
> Tommy
>