I have a wired sensor network topology in NS2 and i'm using UDP protocol. Is 
there anyway to detect congestion on the network links so i can slow the rate 
of UDP packets sent? I'm thinking measuring the number of packets in a link 
queue or maybe measure incoming traffic rate with the available bandwidth on 
the link? I don't know it's doable though. Can anybody help me to detect 
congestion in UDP?                                           

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