review: vamshidhar dantumorse.colorado.edu/~tlen5520/papers/pres/vamshi.pdf · why simulation?...
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Review: Vamshidhar Dantu
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� Wireless LANs are increasing in usage
� Necessity to ensure fairness
� Problems faced
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Base station
DownlinkUplink
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Data
Ack
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� Uplink to Downlink ratio was more than 1 .
� The upstream window reaches max size while downstream window changes.
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� Why Simulation?
� Result for one up and one down stream ..
Below 6
BTW 6 and 42
42 to 84
At 84
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� B� Buffer Size, w� window size.
� Upstream flow reaches max w, while downstream varies w.r.t B and w. Y?
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� Number of ACK’s in the buffer is at max αw.
� Slots for downstream = B- αw.
� Average window size available = 3(B- αw)/4.
� Hence R=4w/ 3(B- αw).
� This gives the naïve ratio plot shown in the next slide.
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� Use Bounded size queuing system. (M/M/1/K) system.
� With w is 42.
� This is a reasonable fit (computed ratio in the previous plot) to the actual curve.
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� Have separate queue’s for ACK and Data at base station
� Not feasible.
� Add DUP ACK’s and/or Delete upstream data packets.
� Effects????
� To set the upstream receive buffer, communicate through ACK’s manipulated at base station to min([B/n], a(cwnd)).
n� number of flows.
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