Performance Comparison of Handover Rerouting Schemes in Wireless ATM Networks
The major issue of the integration of wireless and wired ATM is the support of user mobility. In effect, many technical challenges have been posed due to mobility support. One of the most important challenges is the rerouting of active connections of mobile user during handover. The rerouting of...
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Main Author: | |
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Format: | Thesis |
Language: | English English |
Published: |
1999
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Online Access: | http://psasir.upm.edu.my/id/eprint/10301/1/FK_1999_23_A.pdf http://psasir.upm.edu.my/id/eprint/10301/ |
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Summary: | The major issue of the integration of wireless and wired ATM is the
support of user mobility. In effect, many technical challenges have been posed due
to mobility support. One of the most important challenges is the rerouting of active
connections of mobile user during handover. The rerouting of connections must
exhibit low handover latency, limit the handover delay or disruption time, maintain
efficient routes and minimise the impact on existing infrastructure.
To date, two dominant approaches have been proposed to support mobility
into fixed ATM network. The first is the mobility enhanced switches approach and
the second is the separate network-elements specific to mobility approach. The
first approach implies updating the existing ATM switches with mobile specific
features. The mobility functions in the second approach are entrusted to a control
station attached to the ATM switch as is implemented by the Magic WAND
projects. In this thesis, we investigate how mobility can be supported using both
approaches. To demonstrate the effectiveness of the above approaches, we
compare the performance by analytically derived formulate for their hand over
latency, hand over delay, buffer size, and bandwidth requirements. The formulate
were derived for both backward and forward hand overs using a number of
potential rerouting schemes proposed for wireless ATM network.
The results show that the mobility enhanced switches approach has slightly
better performance than the separate network elements approach. The results also
show that backward handover has better performance than forward handover in
terms of the handover delay and buffer requirement. Finally, the results show that
the Anchor Switch rerouting scheme is the best among other rerouting schemes
proposed for wireless ATM. |
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