A Fast Handoff Scheme A Fast Handoff Scheme For IP over Bluetooth For IP over Bluetooth Sang-Hsu Chung, Hyunsoo Yoon, and Jung-Wan Sang-Hsu Chung, Hyunsoo Yoon, and Jung-Wan Cho Cho Department of Electrical Engineering & Department of Electrical Engineering & Computer Science Divison of Computer Computer Science Divison of Computer Science Science Korea Advanced Institute of Science and Korea Advanced Institute of Science and Technology Technology International Conference on Parallel International Conference on Parallel Processing Workshops, 2002 (ICPPW’02) Processing Workshops, 2002 (ICPPW’02) Speaker : Chung-Hsien Hsu Speaker : Chung-Hsien Hsu
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A Fast Handoff Scheme For IP over Bluetooth Sang-Hsu Chung, Hyunsoo Yoon, and Jung-Wan Cho Department of Electrical Engineering & Computer Science Divison.
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A Fast Handoff Scheme A Fast Handoff Scheme For IP over BluetoothFor IP over Bluetooth
Sang-Hsu Chung, Hyunsoo Yoon, and Jung-Wan ChoSang-Hsu Chung, Hyunsoo Yoon, and Jung-Wan ChoDepartment of Electrical Engineering & Computer Department of Electrical Engineering & Computer
Science Divison of Computer ScienceScience Divison of Computer ScienceKorea Advanced Institute of Science and TechnologyKorea Advanced Institute of Science and Technology
International Conference on Parallel Processing International Conference on Parallel Processing Workshops, 2002 (ICPPW’02)Workshops, 2002 (ICPPW’02)
BLUEPAC ( BLUEtooth Public ACcess )BLUEPAC ( BLUEtooth Public ACcess ) It is a kind of the indoor network and its structure is It is a kind of the indoor network and its structure is
similar to that of cellular network.similar to that of cellular network. It is designed to support IP over Bluetooth.It is designed to support IP over Bluetooth. Providing users to access to the public network such Providing users to access to the public network such
as the Internet.as the Internet. It can be installed in a public area such as train It can be installed in a public area such as train
stations, airports, and supermarkets.stations, airports, and supermarkets.
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Introduction (cont.)
Fixed Bluetooth Device
Assume the scan intervalof a base station is 1.28 sec
Scan IntervalScan Interval The frequency synchronization delay is proportional to The frequency synchronization delay is proportional to
the scan interval of the receiver.the scan interval of the receiver. Bluetooth specification defined three scan intervals:Bluetooth specification defined three scan intervals:
• 10 ms ( continuous scan )10 ms ( continuous scan )• 1.28 sec1.28 sec• 2.56 sec2.56 sec
Motive:Motive: Short range of Bluetooth arises frequent handoffs.Short range of Bluetooth arises frequent handoffs. Slow handoffs might result in the degradation of the Slow handoffs might result in the degradation of the
network performance.network performance.
The proposed scheme is motivated by the need The proposed scheme is motivated by the need for a fast handoff in BLUEPAC.for a fast handoff in BLUEPAC.
Fundamental idea:Fundamental idea: Base station controller assists a mobile device to Base station controller assists a mobile device to
establish a connection to new base stations by giving establish a connection to new base stations by giving their addresses and clocks.their addresses and clocks.
A mobile device during a handoff has no need for A mobile device during a handoff has no need for inquiring the new base station.inquiring the new base station.
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Mobile device
OldBS
NewBS1
NewBS2BSC
Request msg for neighboring BS infoRequest msg for clock and device addr
Presented a new scheme for improving the handoff Presented a new scheme for improving the handoff performance in BLUEPAC.performance in BLUEPAC.
In order to reduce handoff delay, the inquiry procedure In order to reduce handoff delay, the inquiry procedure should be invoked as small times as possible.should be invoked as small times as possible.
Base station controller stations aggressively assist a Base station controller stations aggressively assist a mobile device, the mobile device has no need to inquiry mobile device, the mobile device has no need to inquiry the new base stations.the new base stations.
The proposed scheme significantly reduced the handoff The proposed scheme significantly reduced the handoff delay and imposed the very light overhead on the base delay and imposed the very light overhead on the base station.station.