Abstract
In transport control protocol (TCP) over optical burst switching (OBS)
networks, TCP window size and OBS parameters, including assembly period and
burst dropping probability, will impact the network performance. In this paper,
a parameter window data dropping probability (WDDP), is defined to analyze
the impact of the assembly and the burst loss on the network performance in
terms of the round trip time and the throughput. To reduce the WDDP without
introducing the extra assembly delay penalty, we propose a novel TCP window
based flow-oriented assembly algorithm dynamic assembly period (DAP). In the
traditional OBS assembly algorithms, the packets with the same destination
and class of service (CoS) are assembled into the same burst, i.e., the packets
from different sources will be assembled into one burst. In that case, one
burst loss will influence multiple TCP sources. In DAP, the packets from one
TCP connection are assembled into bursts, which can avoid the above situation.
Through comparing the two consecutive burst lengths, DAP can track the variation
of TCP window dynamically and update the assembly period for the next assembly.
In addition, the ingress node architecture for the flow-oriented assembly
is designed. The performance of DAP is evaluated and compared with that of
fixed assembly period (FAP) over a single TCP connection and multiple TCP
connections. The results show that DAP performs better than FAP at almost
the whole range of burst dropping probability.
© 2009 IEEE
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