CA2279314A1 - Method and apparatus for performing soft hand-off in a wireless communication system - Google Patents

Method and apparatus for performing soft hand-off in a wireless communication system Download PDF

Info

Publication number
CA2279314A1
CA2279314A1 CA002279314A CA2279314A CA2279314A1 CA 2279314 A1 CA2279314 A1 CA 2279314A1 CA 002279314 A CA002279314 A CA 002279314A CA 2279314 A CA2279314 A CA 2279314A CA 2279314 A1 CA2279314 A1 CA 2279314A1
Authority
CA
Canada
Prior art keywords
station
base stations
remote station
signal
base station
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
CA002279314A
Other languages
French (fr)
Other versions
CA2279314C (en
Inventor
Roberto Padovani
Roy F. Quick
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
Individual
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 Individual filed Critical Individual
Priority to CA2602361A priority Critical patent/CA2602361C/en
Publication of CA2279314A1 publication Critical patent/CA2279314A1/en
Application granted granted Critical
Publication of CA2279314C publication Critical patent/CA2279314C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Abstract

A method and apparatus for providing soft hand-off in a mobile communication system. In current systems, members of an active set of base stations (4, 4A, 4B, 4C) are determined by comparing measured pilot energy with fixed thresholds. The value of providing a redundant communication link to a mobile station (2) primarily depends on the energy of other signals being provided to the mobile station (2). In the present invention, the signal strength of each signal transmitted by other base stations (4, 4A, 4B, 4C) in communication with a mobile station (2) is considered when determining whether to add a base station to the set of base stations (4, 4A, 4B, 4C) in communication with the remote station. A base station is added only if the signal received from that base station provides sufficient added value to justify the impact on system capacity.

Claims (11)

1. A method for selecting base stations to communicate with a remote station comprising:
computing a threshold value in accordance with a combination of signal energies from base stations capable of communicating with said remote station;
comparing a signal energy of a first base station with said threshold;
and selecting said first base station when said signal energy of said first base station exceeds said threshold.
2. The method of Claim 1 wherein said signal energy of said first base station is the energy of a first base station pilot signal measured at said remote station.
3. The method of Claim 1 wherein said combination of signal energies from base stations capable of communicating with said remote station comprises the sum of pilot energy values of pilot with greater received energy than said first base station.
4. The method of Claim 1 wherein said step of computing a threshold value comprises performing a linear operation upon said combination of signal energies from base stations capable of communicating with said remote station.
5. The method of Claim 3 wherein said step of computing a threshold value comprises performing a linear operation upon said combination of signal energies from base stations capable of communicating with said remote station.
6. The method of Claim 4 wherein said linear operation comprises:
multiplying said combination of signal energies from base stations capable of communicating with said remote station by a first variable; and summing a second variable with the product of said multiplication.
7. The method of Claim 6 wherein said first variable has a value of 2.25.
8. The method of Claim 6 wherein said second variable has a value of 3Ø
9. The method of Claim 1 further comprising measuring at said remote station the strength of pilot signals transmitted by a predetermined set of base stations to provide said signal energies from base stations capable of communicating with said mobile station.
10. The method of Claim 9 further comprising the step of transmitting a message indicative of said measured pilot signals from said remote station.
11. The method of Claim 1 further comprising the step of removing said first base station form a set of base stations in communication with said remote station when said signal energy of said first base station is below said threshold.
CA2279314A 1997-01-29 1998-01-27 Method and apparatus for performing soft hand-off in a wireless communication system Expired - Lifetime CA2279314C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2602361A CA2602361C (en) 1997-01-29 1998-01-27 Method and apparatus for performing soft hand-off in a wirless communication system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/790,497 US6151502A (en) 1997-01-29 1997-01-29 Method and apparatus for performing soft hand-off in a wireless communication system
US08/790,497 1997-01-29
PCT/US1998/001058 WO1998033288A2 (en) 1997-01-29 1998-01-27 Method and apparatus for performing soft hand-off in a wireless communication system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2602361A Division CA2602361C (en) 1997-01-29 1998-01-27 Method and apparatus for performing soft hand-off in a wirless communication system

Publications (2)

Publication Number Publication Date
CA2279314A1 true CA2279314A1 (en) 1998-07-30
CA2279314C CA2279314C (en) 2010-11-16

Family

ID=25150859

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2279314A Expired - Lifetime CA2279314C (en) 1997-01-29 1998-01-27 Method and apparatus for performing soft hand-off in a wireless communication system

Country Status (23)

Country Link
US (1) US6151502A (en)
EP (1) EP0956732B1 (en)
JP (1) JP4027989B2 (en)
KR (2) KR100524271B1 (en)
CN (1) CN1168345C (en)
AR (1) AR011591A1 (en)
AT (1) ATE301376T1 (en)
AU (1) AU6032398A (en)
BR (1) BRPI9807027B1 (en)
CA (1) CA2279314C (en)
DE (1) DE69831058T2 (en)
DK (1) DK0956732T3 (en)
ES (1) ES2245018T3 (en)
FI (1) FI19991648A (en)
ID (1) ID24950A (en)
IL (1) IL131091A (en)
MY (1) MY118178A (en)
NO (1) NO324444B1 (en)
PT (1) PT956732E (en)
RU (1) RU2217871C2 (en)
TW (1) TW546971B (en)
WO (1) WO1998033288A2 (en)
ZA (1) ZA98700B (en)

Families Citing this family (99)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6141555A (en) * 1997-06-09 2000-10-31 Nec Corporation Cellular communication system, and mobile and base stations used in the same
JP3693083B2 (en) * 1997-07-02 2005-09-07 ソニー株式会社 Receiving device and receiving method
KR100265855B1 (en) * 1997-07-10 2000-09-15 정선종 Method for processing handoff call in wireless communication system
US6754497B1 (en) * 1997-10-09 2004-06-22 Interdigital Technology Corporation Seamless handoff system and method
US9118387B2 (en) 1997-11-03 2015-08-25 Qualcomm Incorporated Pilot reference transmission for a wireless communication system
US7184426B2 (en) 2002-12-12 2007-02-27 Qualcomm, Incorporated Method and apparatus for burst pilot for a time division multiplex system
JP3990016B2 (en) * 1998-01-22 2007-10-10 富士通株式会社 CDMA soft handoff control method
US6603751B1 (en) * 1998-02-13 2003-08-05 Qualcomm Incorporated Method and system for performing a handoff in a wireless communication system, such as a hard handoff
WO1999041925A1 (en) * 1998-02-16 1999-08-19 Nokia Networks Oy Method and system for performing handover in a mobile communication system
KR100326330B1 (en) * 1998-05-08 2002-06-26 윤종용 Hand-off apparatus for mobile communication system and method therefor
US6381458B1 (en) * 1998-05-15 2002-04-30 Telefonaktiebolaget Lm Ericsson (Publ) Method and system for soft handoff control based on access network capacity
US20030194033A1 (en) * 1998-05-21 2003-10-16 Tiedemann Edward G. Method and apparatus for coordinating transmission of short messages with hard handoff searches in a wireless communications system
JP2984653B1 (en) * 1998-06-11 1999-11-29 埼玉日本電気株式会社 Base station wireless device for CDMA cellular system
US6353602B1 (en) * 1998-08-07 2002-03-05 Lucent Technologies Inc. CDMA base station assisted soft handoff
JP3204310B2 (en) * 1998-08-12 2001-09-04 日本電気株式会社 CDMA mobile communication system and downlink transmission power control method thereof
US6360100B1 (en) * 1998-09-22 2002-03-19 Qualcomm Incorporated Method for robust handoff in wireless communication system
GB2343330A (en) * 1998-10-29 2000-05-03 Fujitsu Ltd Soft handoff method using a backup link
JP2978920B1 (en) * 1998-11-09 1999-11-15 埼玉日本電気株式会社 Transmission power control method and system in CDMA base station
FI109956B (en) * 1998-12-16 2002-10-31 Nokia Corp Procedure for communication of neighbor cell information and systems according to methods and mobile telephone
US6587446B2 (en) 1999-02-11 2003-07-01 Qualcomm Incorporated Handoff in a wireless communication system
US6240290B1 (en) 1999-03-04 2001-05-29 Harris Corporation Base station hand-off mechanism for cellular communication system
KR100291038B1 (en) * 1999-03-12 2001-05-15 윤종용 Method for searching target frequency of mobile station in cellular system
US6907243B1 (en) * 1999-06-09 2005-06-14 Cisco Technology, Inc. Method and system for dynamic soft handoff resource allocation in a wireless network
US6594243B1 (en) * 1999-07-15 2003-07-15 Lucent Technologies Inc. Methods and apparatus for enhanced soft handoff in a CDMA wireless communication system
US8064409B1 (en) 1999-08-25 2011-11-22 Qualcomm Incorporated Method and apparatus using a multi-carrier forward link in a wireless communication system
CN1274160C (en) * 1999-09-08 2006-09-06 摩托罗拉公司 Link selection in communication system
US6711420B1 (en) * 1999-09-15 2004-03-23 Qualcomm, Incorporated Modified finger assignment algorithm for high data rate calls
US6621804B1 (en) 1999-10-07 2003-09-16 Qualcomm Incorporated Method and apparatus for predicting favored supplemental channel transmission slots using transmission power measurements of a fundamental channel
DE19961516A1 (en) * 1999-12-20 2001-07-05 Siemens Ag Method for controlling connection forwarding in a radio communication system
US6442395B1 (en) * 1999-12-22 2002-08-27 Ericsson Inc. Modified directed retry feature
KR100350476B1 (en) * 1999-12-30 2002-08-28 삼성전자 주식회사 apparatus and method for implementing hand-off in cdma communication system
US6625467B2 (en) * 2000-07-13 2003-09-23 Qualcomm, Incorporated Method and apparatus for performing idle mode reacquisition and handoff in an asynchronous communication system
US7193981B1 (en) * 2000-07-25 2007-03-20 Lucent Technologies Inc. Method of processing soft handoff information at a base station
US7016322B1 (en) 2000-09-25 2006-03-21 Cisco Technology, Inc. Generating graded packets for packet voting in wireless communications systems
US7061886B1 (en) 2000-09-25 2006-06-13 Cisco Technology, Inc. Packet voting in wireless communications systems
US7088695B1 (en) * 2000-09-25 2006-08-08 Cisco Technology, Inc. Packet voting in wireless mobile devices
CN1159931C (en) * 2000-10-02 2004-07-28 株式会社Ntt都科摩 Mobile communication system, base mobile station, and method for controlling mobile communication
US7054631B2 (en) * 2000-10-23 2006-05-30 Denso Corporation Enhancement of soft handoff in a mobile wireless network through the use of dynamic information feedback from mobile users
US6973098B1 (en) 2000-10-25 2005-12-06 Qualcomm, Incorporated Method and apparatus for determining a data rate in a high rate packet data wireless communications system
US7068683B1 (en) 2000-10-25 2006-06-27 Qualcomm, Incorporated Method and apparatus for high rate packet data and low delay data transmissions
US6968186B2 (en) * 2000-11-30 2005-11-22 Lucent Technologies Inc. System and method for preventing dropped calls
US6850499B2 (en) 2001-01-05 2005-02-01 Qualcomm Incorporated Method and apparatus for forward power control in a communication system
US7016325B2 (en) * 2001-01-18 2006-03-21 Strix Systems, Inc. Link context mobility method and system for providing such mobility, such as a system employing short range frequency hopping spread spectrum wireless protocols
US7006828B1 (en) * 2001-02-12 2006-02-28 Via Telecom Co. Ltd. Method and apparatus for performing cell selection handoffs in a wireless communication system
US7006483B2 (en) 2001-02-23 2006-02-28 Ipr Licensing, Inc. Qualifying available reverse link coding rates from access channel power setting
US7103019B1 (en) 2001-03-21 2006-09-05 Cisco Technology, Inc. Error correction using redundant packet streams in wireless communications systems
US6909698B1 (en) 2001-03-21 2005-06-21 Cisco Technology, Inc. Redundant packet selection based on packet content in wireless communications systems
US7023810B1 (en) 2001-03-21 2006-04-04 Cisco Technology, Inc. Decoding using redundant packet selection information in wireless communications systems
US6944123B1 (en) * 2001-03-21 2005-09-13 Cisco Technology, Inc. Redundant packet selection and manipulation in wireless communications systems
KR100395510B1 (en) * 2001-03-30 2003-08-25 주식회사 하이닉스반도체 Method for Call Processing for Channel Assignment into Soft/Softer Handoff in Access Handoff
US6978144B1 (en) * 2001-04-19 2005-12-20 Cisco Technology, Inc. Method and system for managing real-time bandwidth in a wireless network
US7194010B2 (en) * 2001-05-02 2007-03-20 Strix Systems, Inc. Wireless base station to base station synchronization in a communication system, such as a system employing a short range frequency hopping or time division duplex scheme
US7151757B2 (en) * 2001-05-02 2006-12-19 Strix Systems, Inc. Wireless base station to base station synchronization in a communication system, such as a system employing a short-range frequency hopping or time division duplex scheme
WO2002103988A1 (en) * 2001-05-02 2002-12-27 Strix Systems, Inc. Wireless base station neighbor discovery in a communication system employing a short-range frequency hopping scheme
US7058035B2 (en) * 2001-06-29 2006-06-06 Qualcomm, Indorporated Communication system employing multiple handoff criteria
EP1283651A1 (en) * 2001-08-06 2003-02-12 Motorola, Inc. A method and apparatus for handover in a CDMA cellular communication system
US6731936B2 (en) * 2001-08-20 2004-05-04 Qualcomm Incorporated Method and system for a handoff in a broadcast communication system
US6980820B2 (en) 2001-08-20 2005-12-27 Qualcomm Inc. Method and system for signaling in broadcast communication system
KR100433899B1 (en) * 2002-01-14 2004-06-04 삼성전자주식회사 Apparatus and method for determining soft hand-over in cdma mobile communication system
KR101006412B1 (en) * 2002-03-25 2011-01-06 인터디지탈 테크날러지 코포레이션 Method and apparatus for blind code detection
US7593367B2 (en) * 2002-06-14 2009-09-22 Qualcomm Incorporated Frequency scan for CDMA acquisition
AU2003249451A1 (en) * 2002-07-31 2004-02-23 Nortel Networks Limited Adaptive dual-mode reverse link scheduling method for wireless telecommunications networks
KR100531841B1 (en) * 2002-11-13 2005-12-02 엘지전자 주식회사 Method for constructing a transmission message in cdma terminal
US7668541B2 (en) 2003-01-31 2010-02-23 Qualcomm Incorporated Enhanced techniques for using core based nodes for state transfer
US20050020273A1 (en) * 2003-07-24 2005-01-27 Nortel Networks Limited Adaptive dual-mode reverse link scheduling method for wireless telecommunications networks
US7912485B2 (en) 2003-09-11 2011-03-22 Qualcomm Incorporated Method and system for signaling in broadcast communication system
US7853215B2 (en) * 2003-10-10 2010-12-14 Motorola, Inc. Communication circuit and method for selecting a reference link
KR100810333B1 (en) * 2004-06-15 2008-03-04 삼성전자주식회사 Apparatus and method for supporting soft handover in a broadband wireless access communication system
KR100965694B1 (en) * 2004-06-15 2010-06-24 삼성전자주식회사 System and method for supporting soft handover in a broadband wireless access communication system
US20060019663A1 (en) * 2004-07-12 2006-01-26 Interdigital Technology Corporation Robust and fast handover in a wireless local area network
JP4448403B2 (en) * 2004-08-16 2010-04-07 富士通株式会社 Power level measuring apparatus and mobile station
US7684373B2 (en) * 2004-09-02 2010-03-23 Qualcomm Incorporated Coverage determination and switching between overlay communication systems
KR20060030428A (en) * 2004-10-05 2006-04-10 삼성전자주식회사 Method and system for controlling hard handoff in mobile network
US7738871B2 (en) * 2004-11-05 2010-06-15 Interdigital Technology Corporation Wireless communication method and system for implementing media independent handover between technologically diversified access networks
US8086241B2 (en) * 2004-11-18 2011-12-27 Mediatek Incorporation Handoff methods, and devices utilizing same
US20070021086A1 (en) * 2005-07-22 2007-01-25 Industrial Technology Research Institute Method for path selection and signal processing in wireless communications system
EP1750472B1 (en) * 2005-08-05 2019-10-02 Samsung Electronics Co., Ltd. Apparatus and method for performing handoff in a communication system
US8983468B2 (en) 2005-12-22 2015-03-17 Qualcomm Incorporated Communications methods and apparatus using physical attachment point identifiers
US9078084B2 (en) 2005-12-22 2015-07-07 Qualcomm Incorporated Method and apparatus for end node assisted neighbor discovery
US8509799B2 (en) 2005-09-19 2013-08-13 Qualcomm Incorporated Provision of QoS treatment based upon multiple requests
US9066344B2 (en) 2005-09-19 2015-06-23 Qualcomm Incorporated State synchronization of access routers
US9736752B2 (en) 2005-12-22 2017-08-15 Qualcomm Incorporated Communications methods and apparatus using physical attachment point identifiers which support dual communications links
US8982778B2 (en) 2005-09-19 2015-03-17 Qualcomm Incorporated Packet routing in a wireless communications environment
US8982835B2 (en) 2005-09-19 2015-03-17 Qualcomm Incorporated Provision of a move indication to a resource requester
US8547948B2 (en) * 2005-10-06 2013-10-01 Lockheed Martin Corporation Antenna management system
US20090207790A1 (en) * 2005-10-27 2009-08-20 Qualcomm Incorporated Method and apparatus for settingtuneawaystatus in an open state in wireless communication system
KR101172916B1 (en) * 2006-02-13 2012-08-10 삼성전자주식회사 Handoff control method and apparatus of a mobile terminal in a code division multiple access system
US9083355B2 (en) 2006-02-24 2015-07-14 Qualcomm Incorporated Method and apparatus for end node assisted neighbor discovery
EP2822195B1 (en) 2006-09-26 2016-01-13 TCL Communication Technology Holdings Limited Data communication method and mobile communication system
US9155008B2 (en) 2007-03-26 2015-10-06 Qualcomm Incorporated Apparatus and method of performing a handoff in a communication network
US8437281B2 (en) * 2007-03-27 2013-05-07 Cisco Technology, Inc. Distributed real-time data mixing for conferencing
US8830818B2 (en) 2007-06-07 2014-09-09 Qualcomm Incorporated Forward handover under radio link failure
US9094173B2 (en) 2007-06-25 2015-07-28 Qualcomm Incorporated Recovery from handoff error due to false detection of handoff completion signal at access terminal
US8964692B2 (en) 2008-11-10 2015-02-24 Qualcomm Incorporated Spectrum sensing of bluetooth using a sequence of energy detection measurements
US8811200B2 (en) 2009-09-22 2014-08-19 Qualcomm Incorporated Physical layer metrics to support adaptive station-dependent channel state information feedback rate in multi-user communication systems
US8615241B2 (en) 2010-04-09 2013-12-24 Qualcomm Incorporated Methods and apparatus for facilitating robust forward handover in long term evolution (LTE) communication systems
KR101318013B1 (en) * 2010-08-30 2013-10-14 주식회사 팬택 Terminal having simple transfer mode and network connecting method using the same
US20140274050A1 (en) * 2013-03-14 2014-09-18 Qualcomm Incorporated Cell reselection with performance-based suitability criterion
KR20190029392A (en) 2017-09-11 2019-03-20 강은 waist-heating mat using ceramic blocks

Family Cites Families (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2048056C1 (en) * 1970-09-30 1978-10-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Receiver for electrical oscillations modulated in SSMA technology
US4112257A (en) * 1977-03-24 1978-09-05 Frost Edward G Comprehensive automatic mobile radio telephone system
US4868795A (en) * 1985-08-05 1989-09-19 Terra Marine Engineering, Inc. Power leveling telemetry system
FR2592256B1 (en) * 1985-12-20 1988-02-12 Trt Telecom Radio Electr DEVICE FOR CONTROLLING THE TRANSMIT POWER OF A RADIO BEAM
DE3607687A1 (en) * 1986-03-08 1987-09-10 Philips Patentverwaltung METHOD AND CIRCUIT ARRANGEMENT FOR SWITCHING A RADIO CONNECTION INTO ANOTHER RADIO CELL OF A DIGITAL RADIO TRANSMISSION SYSTEM
FR2595889B1 (en) * 1986-03-14 1988-05-06 Havel Christophe TRANSMISSION POWER CONTROL DEVICE IN A RADIO COMMUNICATION TRANSCEIVER STATION
US4901307A (en) * 1986-10-17 1990-02-13 Qualcomm, Inc. Spread spectrum multiple access communication system using satellite or terrestrial repeaters
JPS63226124A (en) * 1986-10-29 1988-09-20 Oki Electric Ind Co Ltd Level control circuit for radio equipment
US5267262A (en) * 1989-11-07 1993-11-30 Qualcomm Incorporated Transmitter power control system
US5056109A (en) * 1989-11-07 1991-10-08 Qualcomm, Inc. Method and apparatus for controlling transmission power in a cdma cellular mobile telephone system
US5101501A (en) * 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system
US5265119A (en) * 1989-11-07 1993-11-23 Qualcomm Incorporated Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
FI86352C (en) * 1989-11-14 1992-08-10 Nokia Oy Ab DIGITALISKT RADIOLAENKSYSTEM OCH FOERFARANDE FOER REGLERING AV EN SAENDINGSEFFEKT I ETT DIGITALISKT RADIOLAENKSYSTEM.
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
SE467386B (en) * 1990-10-05 1992-07-06 Ericsson Telefon Ab L M PROCEDURE CONTROLS OUTPUTS IN MOBILE RADIO SYSTEM
US5093840A (en) * 1990-11-16 1992-03-03 Scs Mobilecom, Inc. Adaptive power control for a spread spectrum transmitter
US5204876A (en) * 1991-03-13 1993-04-20 Motorola, Inc. Method and apparatus for providing high data rate traffic channels in a spread spectrum communication system
CA2105381C (en) * 1991-04-01 1998-05-05 Thomas G. Hulsebosch Target channel verification in a radiotelephone system
US5107487A (en) * 1991-05-28 1992-04-21 Motorola, Inc. Power control of a direct sequence CDMA radio
JP3132043B2 (en) * 1991-06-13 2001-02-05 日本電気株式会社 Clock extraction circuit
US5220678A (en) * 1991-08-12 1993-06-15 Motorola, Inc. Method and apparatus for adjusting the power of a transmitter
US5245629A (en) * 1991-10-28 1993-09-14 Motorola, Inc. Method for compensating for capacity overload in a spread spectrum communication system
US5267261A (en) * 1992-03-05 1993-11-30 Qualcomm Incorporated Mobile station assisted soft handoff in a CDMA cellular communications system
US5305468A (en) * 1992-03-18 1994-04-19 Motorola, Inc. Power control method for use in a communication system
KR100289630B1 (en) * 1992-07-13 2001-05-02 리패치 Wireless LAN output control method and device
US5465399A (en) * 1992-08-19 1995-11-07 The Boeing Company Apparatus and method for controlling transmitted power in a radio network
NZ255617A (en) * 1992-09-04 1996-11-26 Ericsson Telefon Ab L M Tdma digital radio: measuring path loss and setting transmission power accordingly
JP2802870B2 (en) * 1993-03-10 1998-09-24 エヌ・ティ・ティ移動通信網株式会社 Code division multiplex mobile communication apparatus and cell selection method for code division multiplex mobile communication
US5752190A (en) * 1993-07-30 1998-05-12 Hughes Electronics Supervisory audio tone based carrier-to-interference measurement in a mobile cellular communication system
US5422933A (en) * 1993-09-09 1995-06-06 Hughes Aircraft Compnay Method and system for effecting handoff in a cellular communication system
JP3192839B2 (en) * 1993-09-20 2001-07-30 富士通株式会社 How to determine initial transmit power
US6157668A (en) * 1993-10-28 2000-12-05 Qualcomm Inc. Method and apparatus for reducing the average transmit power of a base station
US5383219A (en) * 1993-11-22 1995-01-17 Qualcomm Incorporated Fast forward link power control in a code division multiple access system
US5697053A (en) * 1994-07-28 1997-12-09 Lucent Technologies Inc. Method of power control and cell site selection
US5539744A (en) * 1994-10-17 1996-07-23 At&T Corp. Hand-off management for cellular telephony
US5577022A (en) * 1994-11-22 1996-11-19 Qualcomm Incorporated Pilot signal searching technique for a cellular communications system
US5701585A (en) * 1994-12-12 1997-12-23 Telefonaktiebolaget Lm Ericsson Mobile assisted handoff
US5774809A (en) * 1996-02-12 1998-06-30 Nokia Mobile Phones Limited Simplified mobile assisted handoff of signal between cells
US5889768A (en) * 1996-08-30 1999-03-30 Motorola, Inc. Method of and apparatus for pilot channel acquisition
US5987012A (en) * 1996-12-19 1999-11-16 Motorola, Inc. Method of handing off and a wireless communication device

Also Published As

Publication number Publication date
MY118178A (en) 2004-09-30
IL131091A (en) 2004-03-28
DE69831058T2 (en) 2006-06-08
KR100524271B1 (en) 2005-10-28
WO1998033288A3 (en) 1998-11-12
JP2002513527A (en) 2002-05-08
BR9807027A (en) 2002-08-27
BRPI9807027B1 (en) 2016-07-12
ES2245018T3 (en) 2005-12-16
KR20000070599A (en) 2000-11-25
AU6032398A (en) 1998-08-18
NO324444B1 (en) 2007-10-15
AR011591A1 (en) 2000-08-30
US6151502A (en) 2000-11-21
ZA98700B (en) 1998-07-22
NO993649D0 (en) 1999-07-27
CN1168345C (en) 2004-09-22
CN1253702A (en) 2000-05-17
IL131091A0 (en) 2001-01-28
EP0956732A2 (en) 1999-11-17
TW546971B (en) 2003-08-11
KR100561658B1 (en) 2006-03-20
PT956732E (en) 2005-11-30
DE69831058D1 (en) 2005-09-08
DK0956732T3 (en) 2005-10-17
NO993649L (en) 1999-09-24
FI19991648A (en) 1999-09-29
CA2279314C (en) 2010-11-16
EP0956732B1 (en) 2005-08-03
ID24950A (en) 2000-08-31
RU2217871C2 (en) 2003-11-27
WO1998033288A2 (en) 1998-07-30
JP4027989B2 (en) 2007-12-26
KR20050091105A (en) 2005-09-14
ATE301376T1 (en) 2005-08-15

Similar Documents

Publication Publication Date Title
CA2279314A1 (en) Method and apparatus for performing soft hand-off in a wireless communication system
RU2219661C2 (en) Method and device for selecting base station to communicate with remote station
US6714780B1 (en) System and method for reducing call dropping rates in a multi-beam communication system
US6643520B1 (en) Device and method for controlling initial transmission power of forward link channel in mobile communications system
WO2000031893A3 (en) Method and apparatus for power control based on the probability that the power control command is in error
CA2438364A1 (en) Mobile communication system, base station, and communication control method
EP0872052B1 (en) Method and apparatus for performing handoff in a spread-spectrum communication system
RU99118907A (en) METHOD AND DEVICE FOR PERFORMING REDISTRIBUTION OF A COMMUNICATION CHANNEL IN A WIRELESS COMMUNICATION SYSTEM
US6285663B1 (en) Increasing performance in communications by embedding one signal in another signal
KR960706273A (en) METHOD AND APPARATUS FOR REDUCING THE AVERAGE DOWNLINK TRANSMITTED POWER FROM BASE STATIONS DURING SOFT HANDOFF
CA2047253A1 (en) Method of locating a mobile station
WO1995025365A3 (en) A method for estimating received power and a receiver
WO1997044984A3 (en) Method and apparatus for hard handoff in a cdma system
CA2442102A1 (en) Method of controlling reverse transmission in a mobile communication system
KR970703687A (en) A method and system for confirming the identity of a target cell for handoff
EP0768804A3 (en) Mobile communication system capable of effectively carrying out a hand-over control
IL156764A (en) Method and apparatus for performing mobile assisted hard handoff between communication systems
WO1998059449A3 (en) A method and system for wireless communication
MY117945A (en) Hand- off method and apparatus in cdma cellular system
GB2330490A (en) Power presetting in a radio communication system
AU3164500A (en) A subscriber unit and method of cell selection for a cellular communication system
NO980877D0 (en) Procedure for selecting way to perform a handover, as well as cellular radio system
US20010053128A1 (en) Method and apparatus for determining frame quality in mobile communication system
JPH10322268A (en) Mobile communication system
KR20020066590A (en) Method and apparatus of Packet transmission for the reverse link

Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20180129