Thursday, January 04, 2007
No Transmission
I was trying to simulate packet transmission without using the wifi accees point in the FMIPv6 simulation to test Weighted round robin packet scheduler. The result was the mobile node did not receive any packets from the correspondent node. I suspect this got to with the softradio class which handle the switching between 3G node b and wifi access point.I found WRR packet scheduler only good for constant size packet.
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The WRR info can be found here!
Ok, here is my understanding of WRR.WRR stands for Weighted Round Robin. Imagine a traffic policeman standing in a one way road intersection.
road a
---------\
road b \ road d
----------- O -----------
road c /
---------/
So the job of policeman to service or schedule or to direct the cars each of the road to pass through to road d in the circular manner ( a to b to c and back again). This is called round robin.
Let's say the policeman wants to schedule road a twice as much than road b and c. That's means road a has (2/4 =50%= 0.5), road b (1/4=0.25) and road c (1/4=0.25) weights respectively. So the the policeman will schedule road a, road b, road c , road d and road a ( a,b,c,a) in a circular manner. Hence, this is called weighted round robin.
In short, the policeman is the packet scheduler and cars are the packets in the network.
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