WO2004079967A3 - Improved vertical roaming in wireless networks through improved quality of service measures - Google Patents

Improved vertical roaming in wireless networks through improved quality of service measures Download PDF

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Publication number
WO2004079967A3
WO2004079967A3 PCT/US2004/002500 US2004002500W WO2004079967A3 WO 2004079967 A3 WO2004079967 A3 WO 2004079967A3 US 2004002500 W US2004002500 W US 2004002500W WO 2004079967 A3 WO2004079967 A3 WO 2004079967A3
Authority
WO
WIPO (PCT)
Prior art keywords
wireless network
improved
quality
service
vertical
Prior art date
Application number
PCT/US2004/002500
Other languages
French (fr)
Other versions
WO2004079967A2 (en
Inventor
Zihua Guo
Qian Zhang
Richard Yao
Wenwu Zhu
Original Assignee
Microsoft Corp
Zihua Guo
Qian Zhang
Richard Yao
Wenwu Zhu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Microsoft Corp, Zihua Guo, Qian Zhang, Richard Yao, Wenwu Zhu filed Critical Microsoft Corp
Priority to CN2004800094605A priority Critical patent/CN1771676B/en
Priority to EP04706510.7A priority patent/EP1590897B1/en
Priority to JP2006508633A priority patent/JP4402689B2/en
Publication of WO2004079967A2 publication Critical patent/WO2004079967A2/en
Publication of WO2004079967A3 publication Critical patent/WO2004079967A3/en
Priority to KR1020057016110A priority patent/KR101069328B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic

Abstract

A system and method for improved vertical handoff between different types of wireless network. Network allocation vector occupation and packet collision probability are used as quality of service measures, enabling vertical handoffs to be delayed until actually beneficial to quality of service. Improved wireless network cell boundary detection in vertical handoff scenarios is achieved with a Fourier-based technique in conjunction with an adaptively determined minimum operating signal strength threshold. Improved wireless network cell boundary detection enables vertical handoffs from high quality of service networks to be delayed as long as possible. Together, practical wireless network quality of service measures and improved detection of wireless network cell boundaries in vertical handoff scenarios reduce the rate of unnecessary vertical handoff resulting in higher overall quality of service experienced by a mobile computing device roaming between wireless network types.
PCT/US2004/002500 2003-02-28 2004-01-29 Improved vertical roaming in wireless networks through improved quality of service measures WO2004079967A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN2004800094605A CN1771676B (en) 2003-02-28 2004-01-29 Improved vertical roaming in wireless networks through improved quality of service measures
EP04706510.7A EP1590897B1 (en) 2003-02-28 2004-01-29 Improved vertical roaming in wireless networks through improved quality of service measures
JP2006508633A JP4402689B2 (en) 2003-02-28 2004-01-29 Improved vertical roaming in wireless networks via improved quality of service measures
KR1020057016110A KR101069328B1 (en) 2003-02-28 2005-08-29 Improved vertical roaming in wireless networks through improved quality of service measures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/377,494 2003-02-28
US10/377,494 US6944144B2 (en) 2003-02-28 2003-02-28 Vertical roaming in wireless networks through improved quality of service measures

Publications (2)

Publication Number Publication Date
WO2004079967A2 WO2004079967A2 (en) 2004-09-16
WO2004079967A3 true WO2004079967A3 (en) 2005-01-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/002500 WO2004079967A2 (en) 2003-02-28 2004-01-29 Improved vertical roaming in wireless networks through improved quality of service measures

Country Status (7)

Country Link
US (4) US6944144B2 (en)
EP (1) EP1590897B1 (en)
JP (2) JP4402689B2 (en)
KR (1) KR101069328B1 (en)
CN (1) CN1771676B (en)
TW (1) TWI367645B (en)
WO (1) WO2004079967A2 (en)

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