Abstract
This paper revisits burst contention resolution problems in optical
burst switching (OBS) networks from the viewpoint of network utility maximization.
Burst collision occurs when two or more bursts access the same wavelength
simultaneously, and the occurrence becomes more frequent as the offered load
increases. In particular, when the network is overloaded, no contention resolution
scheme would effectively avoid the collision without the help of congestion
control. We formulate a joint optimization problem where two variables, the
length and the time at which each burst is injected into the network, are
jointly optimized in order to maximize aggregate utility while minimizing
burst loss. A distributed algorithm is also developed, which explicitly reveals
how burst contention resolution and congestion control must interact. The
simulation results show that the joint control decouples throughput performance
from burst loss performance so that burst loss ratio does not increase as
network throughput increases. This is not the case in conventional contention
resolution schemes where burst loss ratio increases as network throughput
increases so that achievable network throughput is limited. Our work is the
first attempt to the joint design of congestion and contention control and
might lead to an interesting development in OBS research.
© 2009 IEEE
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