[ns] Bandwidth of wireless channel
kvinod at iitg.ernet.in
Thu Apr 13 05:38:27 PDT 2006
Thanx for your reply.
Actually, my problem involves calculating the effective bandwidth of a
wireless node (more specifically in a MANET). I guess the bandwidth_
variable of MAC or Phy layers dont give this value.
I am using the default parameters given in the AODV implementation.
To put it more clearly, suppose node 'S' wants to send a pkt to 'R'.
This pkt can either be forwarded through 'A' or 'B' (A & B are one hop
neighbors of S) depending on the bandwidth. So, I am planning to calculate
the effective bandwidths of A and B and choose the node based on it.
Can you (or anyone) suggest a way for this. I would be thankful
On Wed, 12 Apr 2006, Daniel Mahrenholz wrote:
> Vinod schrieb:
>> im working in qos routing in mobile adhoc networks.
>> can anyone tell me why the "default" value of bandwidth is 0 in link layer
>> of type "LL" (wireless routing simulation). Does that mean its not used or
>> something else? I can see that the "delay" value is set to 25us by
>> Also, can anyone tell me whether i can have "cost" param attached to
>> wireless links as we can do in wired?
> The short answer - there is nothing like a "wireless link". Wireless
> communication uses a broadcast medium. Links are only logically defined by
> your MAC layer or routing protocol. Additionally you do not have something
> like a universal "bandwidth of the wireless channel". This depends on your
> technology, modulation schemes etc. So you have to setup this value depending
> on your model technology (e.g. 2 Mbit/s for a WLAN using BPSK modulation).
More information about the Ns-users