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DE69732100D1 - Betriebszustandsteuerung einer mobilstation in einem paketfunksystem - Google Patents

Betriebszustandsteuerung einer mobilstation in einem paketfunksystem

Info

Publication number
DE69732100D1
DE69732100D1 DE69732100T DE69732100T DE69732100D1 DE 69732100 D1 DE69732100 D1 DE 69732100D1 DE 69732100 T DE69732100 T DE 69732100T DE 69732100 T DE69732100 T DE 69732100T DE 69732100 D1 DE69732100 D1 DE 69732100D1
Authority
DE
Germany
Prior art keywords
mobile station
packet radio
state
active state
operating state
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.)
Expired - Lifetime
Application number
DE69732100T
Other languages
English (en)
Other versions
DE69732100T2 (de
Inventor
H Kari
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.)
Nokia Oyj
Nokia Inc
Original Assignee
Nokia Oyj
Nokia Inc
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 Nokia Oyj, Nokia Inc filed Critical Nokia Oyj
Publication of DE69732100D1 publication Critical patent/DE69732100D1/de
Application granted granted Critical
Publication of DE69732100T2 publication Critical patent/DE69732100T2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/20Manipulation of established connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0212Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
DE69732100T 1996-04-01 1997-03-27 Betriebszustandsteuerung einer mobilstation in einem paketfunksystem Expired - Lifetime DE69732100T2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI961472 1996-04-01
FI961472A FI103454B (fi) 1996-04-01 1996-04-01 Matkaviestimen toimintatilojen ohjaus pakettiradiojärjestelmässä
PCT/FI1997/000193 WO1997037504A1 (en) 1996-04-01 1997-03-27 Controlling operating states of a mobile station in a packet radio system

Publications (2)

Publication Number Publication Date
DE69732100D1 true DE69732100D1 (de) 2005-02-03
DE69732100T2 DE69732100T2 (de) 2005-12-08

Family

ID=8545762

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69732100T Expired - Lifetime DE69732100T2 (de) 1996-04-01 1997-03-27 Betriebszustandsteuerung einer mobilstation in einem paketfunksystem

Country Status (10)

Country Link
US (1) US6243579B1 (de)
EP (1) EP0891677B1 (de)
JP (1) JP2001500325A (de)
CN (1) CN1215534A (de)
AT (1) ATE286340T1 (de)
AU (1) AU2029897A (de)
CA (1) CA2250064A1 (de)
DE (1) DE69732100T2 (de)
FI (1) FI103454B (de)
WO (1) WO1997037504A1 (de)

Families Citing this family (89)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6016312A (en) * 1997-02-28 2000-01-18 Motorola, Inc. Radiotelephone and method for clock calibration for slotted paging mode in a CDMA radiotelephone system
FI104874B (fi) 1997-03-27 2000-04-14 Nokia Networks Oy Menetelmä pakettiliikenteen ohjaamiseksi
SE509480C2 (sv) * 1997-12-23 1999-02-01 Telia Ab Hastighetsrelaterad uppdatering av routing- och cell area i ett GPRS-mobiltelefonsystem
FI106424B (fi) 1998-02-13 2001-01-31 Nokia Networks Oy Reititysalueen päivitys pakettiradioverkossa
FI108829B (fi) * 1998-04-02 2002-03-28 Nokia Corp Menetelmä pakettiverkossa
SE521819C2 (sv) * 1998-05-11 2003-12-09 Telia Ab Metod för att minska signaleringslasten vid lokalisering av mobiltelefoner
US6463055B1 (en) * 1998-06-01 2002-10-08 Telefonaktiebolaget L M Ericsson (Publ) Integrated radio telecommunications network and method of interworking an ANSI-41 network and the general packet radio service (GPRS)
FI106512B (fi) 1998-06-26 2001-02-15 Nokia Networks Oy Pakettikytkentäisten yhteyksien hallinta matkaviestinverkossa
JP3005525B2 (ja) * 1998-07-15 2000-01-31 日本電気移動通信株式会社 データ通信方法及びその制御プログラムを記録した記録媒体
JP3164302B2 (ja) * 1998-09-24 2001-05-08 日本電気株式会社 非認識通信方法と非認識通信機能を有する移動無線装置
US6480476B1 (en) 1998-10-15 2002-11-12 Telefonaktiebolaget Lm Ericsson (Publ) Variable sleep mode for mobile stations in a mobile communications
EP1613107A3 (de) * 1998-10-15 2016-11-09 Telefonaktiebolaget LM Ericsson (publ) Variabler Schlafmodus für Mobilfunkgeräte in einem mobilen Kommunikationsnetz
FI108391B (fi) * 1998-10-27 2002-01-15 Nokia Corp Sijaintipalvelut pakettiradioverkossa
FI108203B (fi) 1998-11-27 2001-11-30 Nokia Mobile Phones Ltd Menetelmä ja järjestely tiedon siirtämiseksi pakettiradiopalvelussa
US6711147B1 (en) * 1999-04-01 2004-03-23 Nortel Networks Limited Merged packet service and mobile internet protocol
SE521806C2 (sv) * 1999-04-19 2003-12-09 Telia Ab Förfarande och anordning för styrning av dataförbindelser i ett digitalt cellulärt kommunikationsnät mellan en användarterminal och ett fjärrnät
US6665307B1 (en) * 1999-07-02 2003-12-16 Telefonaktiebolaget Lm Ericsson (Publ) Variable fast page mode
US6519469B1 (en) * 1999-07-02 2003-02-11 Telefonaktiebolaget Lm Ericsson (Publ) Uplink detection of schedule mobiles for avoiding access delays
US6526034B1 (en) 1999-09-21 2003-02-25 Tantivy Communications, Inc. Dual mode subscriber unit for short range, high rate and long range, lower rate data communications
US6480717B1 (en) * 1999-09-28 2002-11-12 Motorola, Inc. Tunneling of non-GSM signaling messages in a GSM based network to enable both non-GSM circuit service and GSM packet service to the mobile station
US7054268B1 (en) * 2000-02-04 2006-05-30 Nokia Mobile Phones, Inc. Method and arrangement for transferring information in a packet radio service with application-based choice of release mode
US6571112B1 (en) 2000-08-03 2003-05-27 Motorola, Inc. Method and apparatus for processing an embedded message at a wireless mobile station which includes a subscriber identity module
US7230932B2 (en) 2000-08-18 2007-06-12 Nokia Mobile Phones Ltd. Method and apparatus for discontinuous reception scheme and power saving mode for user equipment in packet access mode
FI20001876L (fi) 2000-08-25 2002-02-26 Nokia Mobile Phones Ltd Parannettu menetelmä ja järjestely tiedonsiirtämiseksi pakettiradiopalvelussa
FI111312B (fi) * 2000-08-25 2003-06-30 Nokia Corp Yhteyden päätelaitteeseen valvonta tietoliikennejärjestelmässä
FR2822333B1 (fr) * 2001-03-15 2003-07-04 Cit Alcatel Procede de configuration de parametres pour une transmission par paquets de donnees
US20030028612A1 (en) * 2001-08-01 2003-02-06 Intel Corporation System and method for providing mobile server services
JP3775494B2 (ja) * 2001-09-21 2006-05-17 日本電気株式会社 課金システムの情報処理装置、及び課金情報収集方法
KR100405046B1 (ko) * 2001-10-30 2003-11-07 주식회사 케이티프리텔 이동 통신 단말기의 데이터 서비스 사용 이력 관리에 의한배터리 대기시간 증대 방법 및 그 장치
US7305070B2 (en) * 2002-01-30 2007-12-04 At&T Labs, Inc. Sequential presentation of long instructions in an interactive voice response system
US7301950B1 (en) * 2002-02-14 2007-11-27 Nortel Networks Limited Adaptive state transition control
US7376235B2 (en) * 2002-04-30 2008-05-20 Microsoft Corporation Methods and systems for frustrating statistical attacks by injecting pseudo data into a data system
WO2003105519A1 (ja) * 2002-06-05 2003-12-18 株式会社エヌ・ティ・ティ・ドコモ サーバ、移動通信システム、位置情報管理方法、無線基地局、移動局、移動通信システムにおける呼び出し方法及び移動通信方法
US7734291B2 (en) * 2002-07-11 2010-06-08 General Motors Llc Method and system for storing IOTA alert message requests for a vehicle communications system into a queue
US6961570B2 (en) * 2002-07-17 2005-11-01 Asustek Computer Inc. Handling of a wireless device re-entering a service area
TW564652B (en) * 2002-09-05 2003-12-01 Ind Tech Res Inst A mobility management method and system for wireless data networks
FI115189B (fi) * 2002-12-13 2005-03-15 Nokia Corp Menetelmä pakettikytkentäisen yhteyden muodostamiseksi ja menetelmää hyödyntävä solukkoverkko ja solukkoverkon päätelaite
US7236764B2 (en) * 2003-01-08 2007-06-26 Nortel Networks Limited Method and apparatus for updating locations of dormant mobile stations
US7286844B1 (en) * 2003-01-31 2007-10-23 Bbn Technologies Corp. Systems and methods for three dimensional antenna selection and power control in an Ad-Hoc wireless network
CN100440994C (zh) 2003-04-23 2008-12-03 日本电气株式会社 用于移动通信的系统以及方法
KR100665457B1 (ko) * 2003-04-30 2007-01-04 삼성전자주식회사 광대역 무선 접속 통신 시스템에서 슬립 모드 및 어웨이크 모드에서의 상태 천이 제어 시스템 및 방법
US7190981B2 (en) * 2003-06-26 2007-03-13 Nokia Corporation Apparatus, and associated method, for selectably extending a time period in which a mobile station is operated in a non-slotted mode
ATE300162T1 (de) * 2003-09-19 2005-08-15 Ericsson Telefon Ab L M Verfahren, steuergerät und netzwerkknoten zur aufrechterhaltung einer verbindung im falle einer anstehenden anfrage
US7542437B1 (en) * 2003-10-02 2009-06-02 Bbn Technologies Corp. Systems and methods for conserving energy in a communications network
KR100686775B1 (ko) 2003-11-07 2007-02-23 삼성전자주식회사 광대역 무선 접속 통신 시스템에서 트래픽 지시 메시지 전송 방법
US7346348B1 (en) * 2003-12-22 2008-03-18 At&T Mobility Ii, Llc Selective retry of attach and location update procedures
US7551892B1 (en) 2004-02-26 2009-06-23 Bbn Technologies Corp Low-power ad hoc network entry
CN1332534C (zh) * 2004-04-05 2007-08-15 华为技术有限公司 服务通用分组无线业务支持节点监控移动用户状态的方法
US7941094B2 (en) * 2004-06-08 2011-05-10 Intel Corporation Apparatus and method of wireless communication at a plurality of performance levels
WO2006008572A1 (en) * 2004-07-10 2006-01-26 Nokia Corporation A gaming device, a system for gaming and a method of controlling a game
US7609638B2 (en) * 2004-10-04 2009-10-27 Lg Electronics Inc. Message transmission in wireless access system
IL164576A (en) * 2004-10-14 2006-10-05 Alvarion Ltd Method and apparatus for power saving in wireless systems
US7330736B2 (en) 2004-12-17 2008-02-12 Bbn Technologies Corp. Methods and apparatus for reduced energy communication in an ad hoc network
US8145201B2 (en) * 2004-12-17 2012-03-27 Raytheon Bbn Technologies Corp. Methods and apparatus for reduced energy communication in an ad hoc network
US7590403B1 (en) * 2005-06-07 2009-09-15 Good Technology, Inc. Wireless device dormancy override
US20070070983A1 (en) * 2005-09-28 2007-03-29 Bbn Technologies Corp. Methods and apparatus for improved efficiency communication
US8045542B2 (en) * 2005-11-02 2011-10-25 Nokia Corporation Traffic generation during inactive user plane
US7949377B2 (en) * 2005-12-14 2011-05-24 Research In Motion Limited Method and apparatus for user equipment directed radio resource control in a UMTS network
EP2378817B1 (de) * 2005-12-22 2013-04-17 Electronics and Telecommunications Research Institute Verfahren für diskontinuierlichen sende-/empfangsbetrieb zur verringerung des stromverbrauchs in einem zellularen system
KR101221443B1 (ko) * 2006-03-28 2013-01-11 삼성전자주식회사 이동 통신 시스템에서 연결 상태에 있는 단말이 불연속적수신 동작을 수행하는 방법 및 장치
EP1841249B1 (de) * 2006-03-28 2009-05-13 Samsung Electronics Co., Ltd. Verfahren und Vorrichtung zum diskontinuierlichen Empfang eines angeschlossenen Endgeräts in einem mobilen Kommunikationssystem
JP4767746B2 (ja) * 2006-04-21 2011-09-07 株式会社エヌ・ティ・ティ・ドコモ 移動通信システムにおけるパケットスケジューリング方法、基地局及び移動局
DE102006021342A1 (de) 2006-05-05 2007-11-08 T-Mobile International Ag & Co. Kg Verfahren zur Reduzierung der einleitenden Verzögerungszeit bei Netz initiierten Datenübertragungen in Mobilfunknetzen
ATE484937T1 (de) * 2006-05-17 2010-10-15 Research In Motion Ltd Verfahren und system zur anzeige einer ursache für einen abbau einer signalisierungsverbindung in einem umts netz
AU2012207044C1 (en) * 2006-05-17 2015-08-13 Blackberry Limited Method and system for signaling release cause indication in a UMTS network
US8265034B2 (en) * 2006-05-17 2012-09-11 Research In Motion Limited Method and system for a signaling connection release indication
CA2589373C (en) * 2006-05-17 2016-01-05 Research In Motion Limited Method and system for signaling release cause indication in a umts network
KR101208525B1 (ko) * 2006-06-05 2012-12-05 엘지전자 주식회사 유휴모드 전환 제어 방법
WO2008027310A2 (en) 2006-08-25 2008-03-06 Bbn Technologies Corp. Systems and methods for energy-conscious communication in wireless ad-hoc networks
EP2058982A4 (de) * 2006-10-06 2012-02-01 Nec Corp Kommunikationsvorrichtung, -system, -verfahren und -programm
TW200828923A (en) * 2006-12-25 2008-07-01 Inst Information Industry Wireless network scheduling control system and method thereof and computer readable recording media
US9294294B2 (en) * 2007-09-11 2016-03-22 Telefonaktiebolaget L M Ericsson (Publ) Method and arrangement for efficient group communication
US8908581B2 (en) * 2007-05-01 2014-12-09 Qualcomm Incorporated Extended microsleep for communications
KR20100016234A (ko) 2007-05-01 2010-02-12 가부시키가이샤 엔티티 도코모 수신주기 제어방법, 무선기지국 및 이동국
JP5164977B2 (ja) * 2007-05-01 2013-03-21 株式会社エヌ・ティ・ティ・ドコモ 受信周期制御方法、無線基地局及び移動局
US8548456B1 (en) * 2007-07-18 2013-10-01 Marvell International Ltd. Adaptive mobility measurement for continuous packet connectivity
US8149716B2 (en) * 2007-08-20 2012-04-03 Raytheon Bbn Technologies Corp. Systems and methods for adaptive routing in mobile ad-hoc networks and disruption tolerant networks
EP2387283B1 (de) 2007-11-13 2018-11-28 BlackBerry Limited Verfahren und vorrichtung für status-/modusübergänge
EP3641410B1 (de) * 2008-11-10 2021-08-25 BlackBerry Limited Verfahren und vorrichtung zum übergang zu einem batterieeffizienten zustand oder zur konfiguration durch angabe des endes der datenübertragung
KR101723411B1 (ko) 2009-08-21 2017-04-05 엘지전자 주식회사 멀티 캐리어 시스템의 슬립모드 동작 방법 및 장치
EP2505036B1 (de) 2009-11-23 2018-08-22 BlackBerry Limited Verfahren und vorrichtung für status-/modusübergänge
CA3038940C (en) 2009-11-23 2021-04-27 Blackberry Limited Method and apparatus for state/mode transitioning
US9144104B2 (en) 2009-11-23 2015-09-22 Blackberry Limited Method and apparatus for state/mode transitioning
CA2781562A1 (en) * 2009-11-24 2011-06-03 Research In Motion Limited Method and apparatus for state/mode transitioning
US8983532B2 (en) * 2009-12-30 2015-03-17 Blackberry Limited Method and system for a wireless communication device to adopt varied functionalities based on different communication systems by specific protocol messages
ES2725849T3 (es) * 2010-01-29 2019-09-27 Mobileum Inc Redireccionamiento de tráfico en tráfico de itinerancia de datos
BR112012012353A2 (pt) * 2010-02-10 2016-03-22 Research In Motion Ltd método e aparelho para transição de modo/estado
WO2013071145A1 (en) 2011-11-11 2013-05-16 Research In Motion Limited Method and apparatus for user equipment state transition
US20140051415A1 (en) * 2012-08-16 2014-02-20 Ozgur Ekici Reducing data transfer latency caused by state transitions in mobile networks

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4697281A (en) * 1986-03-14 1987-09-29 Spectrum Cellular Communications Corporation, Inc. Cellular telephone data communication system and method
US4731814A (en) 1986-02-21 1988-03-15 AT&T Information Systems Inc. American Telephone & Telegraph Company Computer-controlled cordless telephone
JP2751398B2 (ja) 1989-05-19 1998-05-18 日本電気株式会社 デジタル情報伝送方式
WO1991002424A1 (en) * 1989-08-03 1991-02-21 Motorola, Inc. Portable telephone with power source/mode change during calls
US5237603A (en) * 1989-12-11 1993-08-17 Sony Corporation Cordless telephone which intermittently monitors predetermined channels from all available channels
US5584048A (en) 1990-08-17 1996-12-10 Motorola, Inc. Beacon based packet radio standby energy saver
JPH06177824A (ja) 1992-12-11 1994-06-24 Matsushita Electric Ind Co Ltd 移動無線装置
FI97517C (fi) * 1993-09-06 1996-12-27 Nokia Mobile Phones Ltd Pakettidatan siirto digitaalisessa solukkoverkossa
US5590396A (en) * 1994-04-20 1996-12-31 Ericsson Inc. Method and apparatus for a deep-sleep mode in a digital cellular communication system
FI98426C (fi) * 1994-05-03 1997-06-10 Nokia Mobile Phones Ltd Järjestelmä pakettidatan siirtämiseksi digitaalisen aikajakomonikäyttöön TDMA perustuvan solukkojärjestelmän ilmarajapinnassa
JPH0856378A (ja) 1994-08-12 1996-02-27 Saitama Nippon Denki Kk 移動体パケット通信方式
US6009325A (en) * 1995-02-01 1999-12-28 Motorola, Inc. Method of and apparatus for operating a cellular phone in one of two modes
US5711008A (en) * 1995-03-01 1998-01-20 Northern Telecom Limited Cellular packet data arrangement
US5710975A (en) * 1995-12-26 1998-01-20 Motorola, Inc. Selective call transceiver with system approved power saving state
US5708656A (en) * 1996-09-11 1998-01-13 Nokia Mobile Phones Limited Method and apparatus for packet data transmission

Also Published As

Publication number Publication date
FI103454B1 (fi) 1999-06-30
EP0891677B1 (de) 2004-12-29
JP2001500325A (ja) 2001-01-09
DE69732100T2 (de) 2005-12-08
FI961472L (fi) 1997-10-02
US6243579B1 (en) 2001-06-05
CN1215534A (zh) 1999-04-28
FI103454B (fi) 1999-06-30
AU2029897A (en) 1997-10-22
FI961472A0 (fi) 1996-04-01
CA2250064A1 (en) 1997-10-09
EP0891677A1 (de) 1999-01-20
WO1997037504A1 (en) 1997-10-09
ATE286340T1 (de) 2005-01-15

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