BRPI0417842A - método de efetuar uma operação de economia de energia em uma rede de área local sem fio (wlan) e método de recuperar dados de um ponto de acesso por uma estação móvel em uma rede de área local sem fio (wlan) - Google Patents

método de efetuar uma operação de economia de energia em uma rede de área local sem fio (wlan) e método de recuperar dados de um ponto de acesso por uma estação móvel em uma rede de área local sem fio (wlan)

Info

Publication number
BRPI0417842A
BRPI0417842A BRPI0417842-4A BRPI0417842A BRPI0417842A BR PI0417842 A BRPI0417842 A BR PI0417842A BR PI0417842 A BRPI0417842 A BR PI0417842A BR PI0417842 A BRPI0417842 A BR PI0417842A
Authority
BR
Brazil
Prior art keywords
area network
local area
wlan
wireless local
mobile station
Prior art date
Application number
BRPI0417842-4A
Other languages
English (en)
Inventor
Huai Y Wang
Ye Chen
Stephen P Emeott
Floyd D Simpson
Timothy J Wilson
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of BRPI0417842A publication Critical patent/BRPI0417842A/pt

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving 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 master and terminal is slave
    • H04W52/0216Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • 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)
  • Small-Scale Networks (AREA)

Abstract

"MéTODO DE EFETUAR UMA OPERAçãO DE ECONOMIA DE ENERGIA EM UMA REDE DE áREA LOCAL SEM FIO (WLAN) E MéTODO DE RECUPERAR DADOS DE UM PONTO DE ACESSO POR UMA ESTAçãO MóVEL EM UMA REDE DE áREA LOCAL SEM FIO (WLAN)". Uma estação móvel estabelece uma programação pela qual dados são intercambiados com um ponto de acesso. A programação permite à estação móvel utilizar um modo de baixa energia (608) em ocasiões fora dos períodos de serviço programado. No entanto, a estação móvel poderá ocasionalmente precisar recuperar dados adicionais do ponto de acesso, ou transmitir dados adicionais para o ponto de acesso, e assim inicia um período de serviço não programado para fazê-lo (614).
BRPI0417842-4A 2003-12-19 2004-12-16 método de efetuar uma operação de economia de energia em uma rede de área local sem fio (wlan) e método de recuperar dados de um ponto de acesso por uma estação móvel em uma rede de área local sem fio (wlan) BRPI0417842A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/741,659 US6973052B2 (en) 2003-12-19 2003-12-19 Hybrid power save delivery method in a wireless local area network for real time communication
PCT/US2004/042325 WO2005064952A1 (en) 2003-12-19 2004-12-16 Hybrid power save delivery method in a wireless local area network for real time communication

Publications (1)

Publication Number Publication Date
BRPI0417842A true BRPI0417842A (pt) 2007-04-27

Family

ID=34678223

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0417842-4A BRPI0417842A (pt) 2003-12-19 2004-12-16 método de efetuar uma operação de economia de energia em uma rede de área local sem fio (wlan) e método de recuperar dados de um ponto de acesso por uma estação móvel em uma rede de área local sem fio (wlan)

Country Status (6)

Country Link
US (1) US6973052B2 (pt)
JP (1) JP4733052B2 (pt)
CN (1) CN1922895B (pt)
BR (1) BRPI0417842A (pt)
CA (1) CA2550399C (pt)
WO (1) WO2005064952A1 (pt)

Families Citing this family (102)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7705828B2 (en) 1998-06-26 2010-04-27 Research In Motion Limited Dual-mode mobile communication device
US6278442B1 (en) 1998-06-26 2001-08-21 Research In Motion Limited Hand-held electronic device with a keyboard optimized for use with the thumbs
US6489950B1 (en) 1998-06-26 2002-12-03 Research In Motion Limited Hand-held electronic device with auxiliary input device
US6842169B2 (en) 2001-10-19 2005-01-11 Research In Motion Limited Hand-held electronic device with multiple input mode thumbwheel
EP1466261B1 (en) 2002-01-08 2018-03-07 Seven Networks, LLC Connection architecture for a mobile network
US7590079B2 (en) * 2002-10-25 2009-09-15 Motorola, Inc. Method of communication device initiated frame exchange
US7583648B2 (en) * 2003-05-08 2009-09-01 Meshdynamics, Inc. Managing latency and jitter on wireless LANs
EP1484939B1 (en) * 2003-06-06 2006-05-24 Alcatel Scheduling unit with optimized jitter and queue occupancy
WO2005069806A2 (en) * 2004-01-12 2005-08-04 Avaya Technology Corp. Efficient power management in wireless local area networks
US7492744B2 (en) * 2004-02-06 2009-02-17 Symbol Technologies, Inc. Method and system for multiple basic and extended service set identifiers in wireless local area networks
US7760671B2 (en) * 2004-02-13 2010-07-20 Nokia Corporation Protocol for indicating enhanced capabilities for use by short-range wireless connectivity equipment
JP4336817B2 (ja) * 2004-03-16 2009-09-30 日本電気株式会社 無線通信端末装置、無線通信システムおよび無線通信方法
US20050215200A1 (en) * 2004-03-25 2005-09-29 General Motors Corporation Method and system for implementing a vehicle WiFi access point gateway
WO2005096752A2 (en) * 2004-04-01 2005-10-20 Devicescape Software, Inc. Multi channel throughput enhancement
CA2504809C (en) * 2004-04-21 2012-07-10 Avaya Technology Corp. Organization of automatic power save delivery buffers at an access point
US7668128B1 (en) * 2004-05-17 2010-02-23 Avaya Inc. Features of power save in 802.11e wireless local area networks (WLANs)
US8214447B2 (en) * 2004-06-08 2012-07-03 Bose Corporation Managing an audio network
US7764981B2 (en) * 2004-07-30 2010-07-27 Nokia Corporation System and method for managing a wireless connection to reduce power consumption of a mobile terminal
US20060056322A1 (en) * 2004-09-10 2006-03-16 Simpson Floyd D Method for updating a timer function in a mobile station in a wireless local area network
US7545783B2 (en) * 2004-09-27 2009-06-09 Siemens Communications, Inc. System and method for using presence to configure an access point
US7855986B2 (en) * 2004-11-26 2010-12-21 Panasonic Corporation Communication terminal and method for handling power off time
US7477616B2 (en) * 2005-01-31 2009-01-13 Symbol Technologies, Inc. Power saving frame transmission method
US7577113B2 (en) * 2005-03-31 2009-08-18 Intel Corporation Device, system and method for coordinating power saving with access categories
US20060223593A1 (en) * 2005-04-01 2006-10-05 Ixi Mobile (R&D) Ltd. Content delivery system and method for a mobile communication device
US20060253279A1 (en) * 2005-05-04 2006-11-09 Sung Chih-Ta S Method and apparatus of wireless audio playback system
US7912033B2 (en) * 2005-05-31 2011-03-22 Olympus Corporation Device synchronization on a communication network
EP2120382B1 (en) * 2005-07-25 2012-10-24 Panasonic Corporation HARQ process restriction and transmission of non-scheduled control data via uplink channels
US20070026863A1 (en) * 2005-07-27 2007-02-01 Wilson Timothy J Method and apparatus to facilitate scanning in a wireless local area network
DE102005040027B4 (de) * 2005-08-23 2012-10-25 Nec Europe Ltd. Verfahren zur Steuerung der Kommunikation mit mobilen Stationen über ein drahtloses Netzwerk
US8755848B2 (en) * 2005-09-30 2014-06-17 Qualcomm Incorporated Mobile device power management
US7623545B2 (en) * 2005-10-14 2009-11-24 Menzo Wentink Method and apparatus for extended control over a wireless medium between two or more devices
KR100615139B1 (ko) * 2005-10-18 2006-08-22 삼성전자주식회사 무선통신 시스템에서 전송 시간 구간의 할당 방법과 장치및 그 시스템
WO2007075606A2 (en) * 2005-12-20 2007-07-05 Conexant Systems, Inc. More power save multi-poll indication
US7500119B2 (en) * 2005-12-21 2009-03-03 Intel Corporation Power saving techniques for use in communication systems, networks, and devices
US20070160027A1 (en) * 2005-12-27 2007-07-12 Muqattash Alaa H Dynamic power save modes
WO2007092424A1 (en) 2006-02-06 2007-08-16 Olympus Communication Technology Of America, Inc. Power save system and method
US20070218938A1 (en) * 2006-03-20 2007-09-20 Conexant Systems, Inc. Sleep Mode Systems and Methods
US7668129B2 (en) * 2006-03-30 2010-02-23 Intel Corporation Learning mechanism to configure power save parameters for automatic power save delivery
US20070230418A1 (en) * 2006-03-31 2007-10-04 Nokia Corporation Triggering rule for energy efficient data delivery
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
US8185726B2 (en) * 2006-04-27 2012-05-22 Qualcomm Incorporated Sleep optimization based on system information block scheduling
CN101473689B (zh) * 2006-06-19 2011-02-09 株式会社Ntt都科摩 无线资源分配方法以及无线基站
US20080031208A1 (en) * 2006-08-04 2008-02-07 Microsoft Corporation Synchronization between wireless devices while saving power
US7860038B2 (en) * 2006-08-04 2010-12-28 Microsoft Corporation Wireless support for portable media player devices
US9596585B2 (en) * 2006-08-04 2017-03-14 Microsoft Technology Licensing, Llc Managing associations in ad hoc networks
US8315193B2 (en) 2006-09-14 2012-11-20 Marvell World Trade Ltd. AD-HOC network power save system and method
US7426404B2 (en) * 2006-09-18 2008-09-16 Motorola, Inc. Method and system for consolidating power saving classes
CN101193444B (zh) * 2006-11-30 2010-08-11 华为技术有限公司 资源指配方法及其系统和设备
TWI329466B (en) * 2006-12-01 2010-08-21 Hon Hai Prec Ind Co Ltd Mobile station and method for verifying an access point thereof
US7650433B2 (en) * 2007-01-05 2010-01-19 Microsoft Corporation Power management for multi-interface device clusters
CN101222388B (zh) 2007-01-12 2013-01-16 华为技术有限公司 一种确定接入点存在广播/多播缓存帧的方法和系统
WO2008097060A2 (en) * 2007-02-09 2008-08-14 Lg Electronics Inc. Method for controlling power saving mode of ue in the mobile communication system
KR20080074696A (ko) 2007-02-09 2008-08-13 엘지전자 주식회사 이동 통신 시스템에서의 전력 소모방지 모드 제어 방법
US20080247377A1 (en) * 2007-04-06 2008-10-09 Peter Van Horn Independent medium access control for discovering wireless networks
US20080267168A1 (en) * 2007-04-27 2008-10-30 Zhijun Cai Slow Adaptation of Modulation and Coding for Packet Transmission
US8064390B2 (en) 2007-04-27 2011-11-22 Research In Motion Limited Uplink scheduling and resource allocation with fast indication
WO2008151409A1 (en) * 2007-06-15 2008-12-18 Research In Motion Limited System and method for link adaptation overhead reduction
US20080310356A1 (en) * 2007-06-15 2008-12-18 Zhijun Cai System and Method for Large Packet Delivery During Semi-Persistently Allocated Session
MX2009013413A (es) * 2007-06-15 2010-01-20 Research In Motion Ltd Sistema y metodo para programacion semi-persistente y dinamica y control de recepcion discontinuo.
AU2012201089C1 (en) * 2007-06-15 2014-05-22 Blackberry Limited System and method for semi-persistent and dynamic scheduling and discontinuous reception control
US20080310391A1 (en) * 2007-06-17 2008-12-18 Texas Instruments Incorporated Apparatus for and method of power save traffic control in client/server networks
WO2009021314A1 (en) * 2007-08-14 2009-02-19 Research In Motion Limited System and method for handling of large ip packets during voip session
WO2009026281A1 (en) 2007-08-20 2009-02-26 Research In Motion Limited Inactivity timer in a discontinuous reception configured system
US8086213B1 (en) * 2007-09-07 2011-12-27 Marvell International Ltd. Circuits, architectures, apparatuses, systems, algorithms, methods, and software for wireless arbiter power saving
EP2198642B1 (en) * 2007-09-14 2011-11-30 Research In Motion Limited System and method for discontinuous reception control start time
US9002828B2 (en) 2007-12-13 2015-04-07 Seven Networks, Inc. Predictive content delivery
US8862657B2 (en) 2008-01-25 2014-10-14 Seven Networks, Inc. Policy based content service
US8477674B2 (en) 2008-03-12 2013-07-02 Nokia Corporation Wireless network including post groupcast time
US8274894B2 (en) * 2008-05-07 2012-09-25 Nokia Corporation Quality of service and power aware forwarding rules for mesh points in wireless mesh networks
TWI395976B (zh) * 2008-06-13 2013-05-11 Teco Image Sys Co Ltd 掃描模組之光源投射裝置及其光源排列方法
CN102089932B (zh) 2008-07-10 2015-04-22 马维尔国际贸易有限公司 用于降低无线设备中的功耗的系统和方法
EP2205029A1 (en) 2009-01-06 2010-07-07 Thomson Licensing A method for scheduling wake/sleep cycles by a central device in a wireless network
US8498230B2 (en) * 2009-03-03 2013-07-30 Nokia Corporation Power management in wireless communication systems
US8553714B2 (en) * 2009-06-10 2013-10-08 Stmicroelectronics, Inc. Unified contention based period
US8351954B2 (en) * 2009-06-10 2013-01-08 Stmicroelectronics, Inc. Personal independent basic service set cluster resource sharing
US20100316032A1 (en) * 2009-06-10 2010-12-16 Stmicroelectronics, Inc. Service Period Recovery wIth Source/Destination help
JP2011109252A (ja) * 2009-11-13 2011-06-02 Canon Inc 通信装置、通信装置の制御方法およびプログラム
US8660101B2 (en) * 2009-12-30 2014-02-25 Motorola Solutions, Inc. Method and apparatus for updating presence state of a station in a wireless local area network (WLAN)
US8838783B2 (en) 2010-07-26 2014-09-16 Seven Networks, Inc. Distributed caching for resource and mobile network traffic management
EP3651028A1 (en) 2010-07-26 2020-05-13 Seven Networks, LLC Mobile network traffic coordination across multiple applications
PL3367252T3 (pl) 2010-07-26 2020-05-18 Seven Networks, Llc Zarządzanie ruchem z uwzględnieniem kontekstu w celu zaoszczędzenia zasobów w sieci bezprzewodowej
CN102457945A (zh) * 2010-10-20 2012-05-16 鸿富锦精密工业(深圳)有限公司 用户端设备及其省电方法
US8843153B2 (en) 2010-11-01 2014-09-23 Seven Networks, Inc. Mobile traffic categorization and policy for network use optimization while preserving user experience
WO2012060995A2 (en) 2010-11-01 2012-05-10 Michael Luna Distributed caching in a wireless network of content delivered for a mobile application over a long-held request
EP2684410A4 (en) * 2011-03-07 2014-08-20 Intel Corp MACHINE MACHINE GROUPED COMMUNICATIONS
US9001720B2 (en) 2011-08-31 2015-04-07 Maarten Menzo Wentink Power save with data fetch time, with end of data indication, and with more data acknowledgement
WO2013129861A1 (ko) * 2012-02-28 2013-09-06 엘지전자 주식회사 무선 통신 시스템에서의 서비스 기간 설정 방법 및 이를 위한 장치
CN103369597B (zh) * 2012-03-31 2018-11-09 中兴通讯股份有限公司 无线帧的发送方法及装置
US8812695B2 (en) 2012-04-09 2014-08-19 Seven Networks, Inc. Method and system for management of a virtual network connection without heartbeat messages
EP2846597B1 (en) * 2012-04-30 2017-09-27 LG Electronics Inc. Method and device for accessing channel in wireless lan system
GB2496235B (en) * 2012-07-16 2014-01-08 Renesas Mobile Corp Composite Poll and Data Message
US10057859B2 (en) * 2012-11-06 2018-08-21 Digi International Inc. Synchronized network for battery backup
KR102091138B1 (ko) * 2013-09-12 2020-03-19 삼성전자주식회사 무선 네트워크 환경에서 데이터를 전송하는 방법 및 데이터 전송 장치
KR102137962B1 (ko) * 2014-01-20 2020-07-27 삼성전자 주식회사 Ims을 지원하는 통신 방법 및 장치
JP6313460B2 (ja) * 2014-02-04 2018-04-18 エルジー エレクトロニクス インコーポレイティド 無線lanにおけるパワーセーブモードに基づく動作方法及び装置
US10200951B2 (en) * 2014-02-20 2019-02-05 Qualcomm Incorporated Low power low latency protocol for data exchange
CA2856027A1 (en) 2014-03-18 2015-09-18 Smartrek Technologies Inc. Mesh network system and techniques
CN105101361B (zh) 2014-04-25 2018-08-03 鸿富锦精密工业(深圳)有限公司 节点装置及其通信方法
US10484905B2 (en) * 2015-01-26 2019-11-19 Apple Inc. Optimizing operation of constrained user equipment
US10959174B2 (en) 2017-09-02 2021-03-23 Apple Inc. Wake-up radio with urgent-data criterion
US11375453B2 (en) 2017-12-21 2022-06-28 Apple Inc. Power-efficient communication of group-addressed frames
EP3991513A1 (en) 2019-05-24 2022-05-04 Liwen Chu Power save and group-addressed frames in wlan using multiple communication links

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5940771A (en) * 1991-05-13 1999-08-17 Norand Corporation Network supporting roaming, sleeping terminals
US6023621A (en) * 1996-06-28 2000-02-08 Harris Corporation Wireless communications system and method having dynamic reallocation of communication frequencies
US6404751B1 (en) * 1998-09-15 2002-06-11 Crisco Technology, Inc. Common control channel dynamic frequency assignment method and protocol
JP2000307601A (ja) * 1999-04-23 2000-11-02 Sony Corp 無線伝送方法及び無線伝送装置
JP3705034B2 (ja) * 1999-09-01 2005-10-12 ソニー株式会社 無線伝送制御方法及び無線伝送装置
US7684380B2 (en) * 2002-01-22 2010-03-23 Freescale Semiconductor, Inc. System and method for handling asynchronous data in a wireless network
CA2474252A1 (en) * 2002-01-22 2003-07-31 Knut Odman Method for transmission of isochronous and asynchronous data in a radio network
US7519032B2 (en) * 2002-09-04 2009-04-14 Koninklijke Philips Electronics N.V. Apparatus and method for providing QoS service schedule and bandwidth allocation to a wireless station
US7372855B2 (en) * 2003-01-08 2008-05-13 Sharp Laboratories Of America, Inc. System and method for synchronizing an IEEE 802.11 power-save interval
US8842657B2 (en) * 2003-10-15 2014-09-23 Qualcomm Incorporated High speed media access control with legacy system interoperability

Also Published As

Publication number Publication date
CA2550399C (en) 2010-07-06
CN1922895B (zh) 2010-06-16
WO2005064952A1 (en) 2005-07-14
JP2007528641A (ja) 2007-10-11
CA2550399A1 (en) 2005-07-14
CN1922895A (zh) 2007-02-28
JP4733052B2 (ja) 2011-07-27
US20050135302A1 (en) 2005-06-23
US6973052B2 (en) 2005-12-06

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B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

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B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]
B15K Others concerning applications: alteration of classification

Ipc: H04W 52/02 (2009.01)