CA2266951A1 - Method and apparatus for adjacent service area handoff in communication systems - Google Patents

Method and apparatus for adjacent service area handoff in communication systems

Info

Publication number
CA2266951A1
CA2266951A1 CA002266951A CA2266951A CA2266951A1 CA 2266951 A1 CA2266951 A1 CA 2266951A1 CA 002266951 A CA002266951 A CA 002266951A CA 2266951 A CA2266951 A CA 2266951A CA 2266951 A1 CA2266951 A1 CA 2266951A1
Authority
CA
Canada
Prior art keywords
service area
detected
new service
signal
new
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
CA002266951A
Other languages
French (fr)
Other versions
CA2266951C (en
Inventor
Leonard N. Schiff
David S. Miller
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.)
Qualcomm Inc
Original Assignee
Qualcomm Incorporated
Leonard N. Schiff
David S. Miller
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 Qualcomm Incorporated, Leonard N. Schiff, David S. Miller filed Critical Qualcomm Incorporated
Publication of CA2266951A1 publication Critical patent/CA2266951A1/en
Application granted granted Critical
Publication of CA2266951C publication Critical patent/CA2266951C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources

Abstract

A handoff technique in which system users detect transitions in service between a current service area (B10, S4) and an adjacent service area (B2, S5), and request a forward link channel in the new service area (B2, S5) when a detected signal strength for the new service area exceeds predetermined threshold levels. The forward communications link in the current service area is maintained until the strength of the new service area signal (B2, S5) reaches a certain level and appropriate channel quality is confirmed, as based on various known criteria. Typically, service area transitions are detected using the signal strength of pilot or paging signals associated with service areas, which are used to determine a relative signal strength of new service area signals. Pilot signal level adjustments used to counter roll-off effects are detected and compensated for in comparing signal levels.
To minimize the burden on system resources, new service area signals are not selectable until a minimum time has passed, or a minimum change in energy from a prior pilot signal is detected. In addition, communications using the previous service area can be dropped almost immediately upon engaging the new service area.
CA002266951A 1996-09-27 1997-09-23 Method and apparatus for adjacent service area handoff in communication systems Expired - Lifetime CA2266951C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/722,330 US6233456B1 (en) 1996-09-27 1996-09-27 Method and apparatus for adjacent coverage area handoff in communication systems
US08/722,330 1996-09-27
PCT/US1997/016976 WO1998014026A1 (en) 1996-09-27 1997-09-23 Method and apparatus for adjacent service area handoff in communication systems

Publications (2)

Publication Number Publication Date
CA2266951A1 true CA2266951A1 (en) 1998-04-02
CA2266951C CA2266951C (en) 2008-06-03

Family

ID=24901408

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002266951A Expired - Lifetime CA2266951C (en) 1996-09-27 1997-09-23 Method and apparatus for adjacent service area handoff in communication systems

Country Status (12)

Country Link
US (2) US6233456B1 (en)
EP (1) EP1008271B1 (en)
JP (2) JP3993242B2 (en)
KR (1) KR100509406B1 (en)
CN (1) CN1182751C (en)
AT (1) ATE406061T1 (en)
CA (1) CA2266951C (en)
DE (1) DE69738932D1 (en)
HK (1) HK1029701A1 (en)
RU (1) RU2180159C2 (en)
WO (1) WO1998014026A1 (en)
ZA (1) ZA978676B (en)

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