GB2263037A - Speed estimation - Google Patents

Speed estimation

Info

Publication number
GB2263037A
GB2263037A GB9302377A GB9302377A GB2263037A GB 2263037 A GB2263037 A GB 2263037A GB 9302377 A GB9302377 A GB 9302377A GB 9302377 A GB9302377 A GB 9302377A GB 2263037 A GB2263037 A GB 2263037A
Authority
GB
United Kingdom
Prior art keywords
window
speed
speed estimation
duration
units
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB9302377A
Other versions
GB2263037B (en
GB9302377D0 (en
Inventor
Si Tak Stanley Chia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
Original Assignee
British Telecommunications PLC
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 British Telecommunications PLC filed Critical British Telecommunications PLC
Publication of GB9302377D0 publication Critical patent/GB9302377D0/en
Publication of GB2263037A publication Critical patent/GB2263037A/en
Application granted granted Critical
Publication of GB2263037B publication Critical patent/GB2263037B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Paper (AREA)

Abstract

A system and method of speed estimation for a cellular radio network comprises a number of speed estimation units (14-20). Each unit comprises an averaging window (24) of a different duration, a buffer store (26) and variance calculator (28). The duration of each window is equivalent to the time taken by a mobile unit to traverse a distance of 20 wavelengths of the received signal at a particular speed. An incoming signal is applied to the units. The duration of the window determines the significance of the fast fade components in the signal which is related to mobile unit speed. When the average of a window is substantially constant, the speed corresponding to that window can be assumed to be achieved or exceeded. Decision logic (30) is arranged to poll the outputs of the variance calculators to derive a speed estimation indication. <IMAGE>
GB9302377A 1990-07-25 1991-07-25 Speed estimation Expired - Lifetime GB2263037B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909016341A GB9016341D0 (en) 1990-07-25 1990-07-25 Speed estimation
PCT/GB1991/001241 WO1992001950A2 (en) 1990-07-25 1991-07-25 Speed estimation

Publications (3)

Publication Number Publication Date
GB9302377D0 GB9302377D0 (en) 1993-04-21
GB2263037A true GB2263037A (en) 1993-07-07
GB2263037B GB2263037B (en) 1994-09-21

Family

ID=10679644

Family Applications (2)

Application Number Title Priority Date Filing Date
GB909016341A Pending GB9016341D0 (en) 1990-07-25 1990-07-25 Speed estimation
GB9302377A Expired - Lifetime GB2263037B (en) 1990-07-25 1991-07-25 Speed estimation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB909016341A Pending GB9016341D0 (en) 1990-07-25 1990-07-25 Speed estimation

Country Status (13)

Country Link
US (1) US5396253A (en)
EP (1) EP0540596B1 (en)
JP (1) JP3169606B2 (en)
AT (1) ATE170294T1 (en)
AU (1) AU649056B2 (en)
CA (1) CA2087843C (en)
DE (1) DE69130065T2 (en)
DK (1) DK0540596T3 (en)
ES (1) ES2121571T3 (en)
GB (2) GB9016341D0 (en)
HK (1) HK133496A (en)
SG (1) SG47591A1 (en)
WO (1) WO1992001950A2 (en)

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* Cited by examiner, † Cited by third party
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GB2284725A (en) * 1993-11-27 1995-06-14 Motorola Ltd Method for determining handoff

Also Published As

Publication number Publication date
EP0540596A1 (en) 1993-05-12
CA2087843C (en) 1999-04-27
GB2263037B (en) 1994-09-21
JPH06501307A (en) 1994-02-10
AU649056B2 (en) 1994-05-12
ATE170294T1 (en) 1998-09-15
US5396253A (en) 1995-03-07
AU8223891A (en) 1992-02-18
DK0540596T3 (en) 1999-05-25
ES2121571T3 (en) 1998-12-01
WO1992001950A2 (en) 1992-02-06
HK133496A (en) 1996-08-02
DE69130065D1 (en) 1998-10-01
CA2087843A1 (en) 1992-01-26
DE69130065T2 (en) 1999-02-25
EP0540596B1 (en) 1998-08-26
JP3169606B2 (en) 2001-05-28
GB9016341D0 (en) 1990-09-12
WO1992001950A3 (en) 1992-04-30
SG47591A1 (en) 1998-04-17
GB9302377D0 (en) 1993-04-21

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Legal Events

Date Code Title Description
727 Application made for amendment of specification (sect. 27/1977)
727A Application for amendment of specification now open to opposition (sect. 27/1977)
727B Case decided by the comptroller ** specification amended (sect. 27/1977)
SP Amendment (slips) printed
PE20 Patent expired after termination of 20 years

Expiry date: 20110724