WO2014047901A1 - Procédé d'économie d'énergie pour un nœud d'accès radio - Google Patents

Procédé d'économie d'énergie pour un nœud d'accès radio Download PDF

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Publication number
WO2014047901A1
WO2014047901A1 PCT/CN2012/082380 CN2012082380W WO2014047901A1 WO 2014047901 A1 WO2014047901 A1 WO 2014047901A1 CN 2012082380 W CN2012082380 W CN 2012082380W WO 2014047901 A1 WO2014047901 A1 WO 2014047901A1
Authority
WO
WIPO (PCT)
Prior art keywords
access node
duration
home access
femtocell
powered
Prior art date
Application number
PCT/CN2012/082380
Other languages
English (en)
Inventor
Yingkai ZHANG
Wenjun Wu
Yajuan Luo
Original Assignee
France Telecom
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 France Telecom filed Critical France Telecom
Priority to PCT/CN2012/082380 priority Critical patent/WO2014047901A1/fr
Priority to PCT/IB2013/002546 priority patent/WO2014060839A2/fr
Publication of WO2014047901A1 publication Critical patent/WO2014047901A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention generally relates to radio telecommunication access node power consumption, and more specifically to a method to reduce power consumption of a Femtocell access node.
  • the information and communication technologies (ICT) domain contributes more and more to the global warming.
  • the CEA-LETI evaluates that 3 percent of worldwide energy is consumed by the ICT infrastructure and that ICT infrastructure is responsible for two percents of the worldwide C0 2 emissions, said level being comparable the worldwide emissions of C0 2 by airplanes (Dr L. Herault, CEA-LETI, Holistic Approach for Future Energy Efficient Cellular Networks, Wireless World Research Forum 23 rd Meeting., invited talk, Beijing, China, Oct. 21 st , 2009).
  • the worldwide energy consumed by ICT is bound to increase, being estimated to double every 4 to 5 years.
  • Femtocell access nodes - hereafter Femtocell - are specific cells as they only cover a limited area, such as home, business mall or office.
  • a Femtocell is called a Home eNodeB (HeNB).
  • HeNB Home eNodeB
  • a Femtocell is connected to the core network, either directly through a Serving Gateway or indirectly via a gateway node.
  • a Femtocell only covers a small area for a limited connection of user equipments, such as mobile terminal, it implies reduced power consumption comparing to a Macrocell access node, such as a eNodeB.
  • Femtocells As Femtocells become widely deployed, series of important issues arise, one of which being the energy consumption. According to ABI research (S. Carlaw and C. Wheelock, Femtocell Market Challenges and Opportunities: Cellular-Based Fixed Mobile Convergence for Consumers, SMEs, and Enterprises, ABI Research, 2007) by the end of 2012, a total of approximately 36 million Femtocells are expected to be sold worldwide. Assuming that each Femtocell requires an operational power of 12 W, the total power consumption of all Femtocells will amount to nearly 0.5 GW. Also, it is estimated that Femtocells will produce approximately 2.06 Mt of C0 2 per year. Therefore, an energy-saving method for Femtocells should be designed.
  • the 3G PP T 32.826 vlO.0.0 (2010-03) document proposes a solution to improve energy savings management in a radio access network.
  • Energy Saving Management (ESM) concept defines an energy saving state for eNodeB and Home eNodeB.
  • the network element is powered off.
  • the 3G PP document means that the radio part of the network element is powered off while the control part of the network element remains powered on.
  • the 3G PP document suggests applying the ESM method to a Femtocell B, said Femtocell B being covered by a Macrocell
  • the Femtocell B can be totally powered off when light traffic or no traffic is detected in Femtocell
  • a Femtocell When in energy saving state, potential users in Femtocell B coverage can only connect to the Macrocell A.
  • OAM Operations, Administration, Maintenance
  • a Femtocell relies on OAM for the decision of enabling or disabling its energy saving state. This is adding on the complexity of the management of a cellular network.
  • no user equipments may connect to the Femtocell, the user equipments can only connect to the Macrocell. This is particularly disadvantageous for example when talking about a Closed Subscriber Group (CSG) Femtocell, as potentially user equipments belonging to the CSG may benefit from extra services when connecting to said CSG Femtocell.
  • CSG Closed Subscriber Group
  • the present invention relates to method for managing power consumption of a home access node, said home access node being in a functioning mode called idle mode, the method comprising the following steps executed by the home access node during the idle mode : after a first duration called sleep duration during which at least one component of the home access node is powered off, powering on at least one of the powered off components for a second duration called wake duration,
  • the present method allows energy savings by powering off some components of the home access node during the idle duration.
  • radio components including especially the transmission power amplification components, are powered off during the idle duration, as said components are usually responsible of most of the energy consumption of a radio access node like a Femtocell.
  • energy consumption is greatly reduced.
  • the access node keeps on repeating cycles of sleep and wake intervals. During the wake intervals, potential incoming request are received by the Femtocell, guarantying the connectivity for potential user equipments to the Femtocell.
  • said energy saving method is executed by the Femtocell in an autonomous fashion while preserving the possibility for an user equipment to connect to the Femtocell.
  • the method upon reception of an incoming message, the method further comprises the step of powering on all the previously powered off components, the home access node exiting the idle mode.
  • the home access node when receiving a message, the home access node exits the idle mode, powering on all previously powered off components.
  • the home access node switches back to normal mode of working, called ACTIVE mode.
  • Receiving a message is an indication that a user equipment is entering in communication with the home access node, the home access node resumes to a normal way of working to support the communication with the user equipment.
  • the home access node switches to the IDLE mode in order to save energy.
  • the transition to the IDLE mode is decided after the expiration of a timer.
  • the sleep duration is variable.
  • the sleep duration may change during time.
  • the sleep duration may advantageously be increased from one idle cycle to another.
  • powered off components are powered off during a longer time, resulting in more energy savings.
  • a trade off should be find between short or long idle duration, as longer idle duration means more power saving, it also means more latency when an user equipment wants to connect to the Femtocell.
  • the home access node broadcasts a message signaling the waking up the home access node.
  • Broadcasting a message when entering the wake duration improves the performance of the system. Indeed, user equipment that would want to connect to the Home access node may emit a request for connection during a sleep duration, and the home access node would not be able to receive it.
  • the home access node ensures that user equipments receiving information in the broadcasted message can send their request for connection during the wake duration, when the home access node is able to receive the messages. Thus, it reduces latency time of connection for user equipments.
  • Another object of the invention is a home access node capable of managing power consumption, said home access node being capable of functioning in a mode called idle mode, the home access node comprising :
  • sleep duration after a first duration called sleep duration during which at least one component of the home access node is powered off, means for powering on at least one of the powered off components for a second duration called wake duration
  • Such a home access node is for example a Femtocell or HeNodeB.
  • one object of the invention concerns a computer program, in particular a computer program on or in an information medium or memory, suitable for implementing the method object of the invention.
  • This program can use any programming language, and be in the form of source code, binary code, or of code intermediate between source code and object code such as in a partially compiled form, or in any other desirable form for implementing the communication methods according to the invention.
  • the information medium may be any entity or device capable of storing the program.
  • the medium can comprise a storage means, such as a ROM, for example a CD ROM or a microelectronic circuit ROM, or else a magnetic recording means, for example a diskette (floppy disk) or a hard disk.
  • the information medium may be a transmissible medium such as an electrical or optical signal, which may be conveyed via an electrical or optical cable, by radio or by other means.
  • the programs according to the invention may in particular be downloaded from a network of Internet type.
  • FIG. 1 shows prior art (3GPP), previously described
  • FIG. 2 shows a chart of the transition between IDLE state and ACTIVE state
  • FIG. 3 shows cycles in an IDLE state
  • FIG. 4 shows hardware system and parts of the system powered ON or OFF during the wake and sleep cycles of the IDLE state.
  • FIG. 2 illustrates a first implementation of the method of the present invention.
  • the home access node considered is fro example a Femtocell.
  • the Femtocell works according to two modes, a first mode called ACTIVE mode and a second mode called IDLE mode.
  • ACTIVE mode is similar to the normal mode of working of an existing Femtocell, apart from a triggering step 202 leading the Femtocell to enter the IDLE mode.
  • IDLE mode is described hereafter.
  • the Femtocell works normally, that is to say all the components of the Femtocell are powered on.
  • the Femtocell checks for inactivity, i.e. the Femtocell checks if at least one user equipment attached to the Femtocell has an active communication with another equipment. If the Femtocell has been inactive, i.e. if no user equipment attached to the Femtocell has an active communication with another equipment during more than a duration T transit i o n, the Femtocell leaves the ACTIVE mode and enter the IDLE mode.
  • the Femtocell When entering the IDLE mode during a step 211, the Femtocell first powers off at least one component of the Femtocell.
  • the powered off components will remained powered off for a duration called sleep duration.
  • sleep duration In one embodiment of present invention, only the microprocessor is left powered on during the sleep duration, when others components of the Femtocell are powered off, as described in reference to FIG. 4.
  • others components of the Femtocell may be left powered on along with the microprocessor, for example the components allowing the connection of the Femtocell to the network, i.e. the connection to the Serving Gateway or Gateway.
  • the radio components are advantageously powered off, especially the power amplification components as they do consume lot of energy.
  • Said sleep duration may be fixed, or may advantageously be variable.
  • the Femtocell powers on at least some of the powered off components for a second duration called wake duration.
  • the principle of said wake interval is for the Femtocell to be able to receive potential incoming request from a user equipment that would like to connect to the Femtocell.
  • the Femtocell powers on all the previously powered off components. In one advantageous embodiment, only components necessary to receive potential request or message from user equipments are powered on, as described in FIG. 4.
  • the Femtocell determines, in a step 213, if an incoming message is received by the Femtocell, such a message can be intended to the Femtocell or to a user equipment attached to the Femtocell. If there is no incoming message, the Femtocell enters a new sleep duration by powering off previously powered on components. If an incoming message is received during the sleep duration, the Femtocell returns to the ACTIVE mode, powering on all powered off components.
  • the Femtocell broadcasts a message signaling the waking up the Femtocell when entering the wake interval.
  • the wake duration comprises 3 Transmission Time Interval (TTI, in a 3G context).
  • TTI Transmission Time Interval
  • the Femtocell powers on the components necessary for radio transmission, for example radio frequency components and power amplification, and broadcasts a message signaling the waking up the Femtocell through a broadcast channel.
  • the Femtocell listens to a random access channel, specified in the broadcast message, for potential incoming messages from user equipments.
  • user equipments may send their request for connection to the Femtocell at the right timing, meaning during the last two TTI of the wake duration.
  • This implementation allows for a better performance of network connection latency, while contributing in reducing overall energy savings.
  • the sleep duration may be variable.
  • FIG. 2 describes one exemplary embodiment of present invention wherein the sleep duration is variable.
  • the sleep duration is T min .
  • the sleep duration is doubled : 2 x T min . And so on until the sleep duration reaches a maximum T max :
  • a parameter "i" is set to zero when going from step 202 to step 211, i. e. when entering IDLE mode;
  • step 213 if no incoming request is received, "i" is increased by one;
  • FIG. 3 shows the cycles of sleep and wake intervals.
  • the Femtocell is in ACTIVE mode.
  • the Femtocell is inactive for a duration longer than T tra nsit ion, , the Femtocell then enters IDLE mode.
  • the Femtocell is in the first sleep interval of the IDLE mode with "i" equal to zero.
  • the Femtocell is in its first wake interval.
  • 303A and 303B form the first cycle of the IDLE mode.
  • the Femtocell goes to the second sleep interval of the IDLE mode, 304Awith "i" equal to one.
  • 304B is the next wake interval.
  • 30NA and 30NB are representing the n-th cycle of the IDLE mode for the Femtocell.
  • the sleep duration of 30NA is max(2 n xT min ; T max )..
  • T max is chosen as the maximum T max that satisfy the requirement of service delay.
  • FIG. 4 are illustrative embodiments of the present system.
  • FIG. 4A represents a Femtocell, typically a Home eNodeB, when in ACTIVE mode. In such situation, all components are powered on.
  • FIG4B represents an exemplary embodiment of the same Femtocell when in a sleep interval of the IDLE mode. In such situation, all components, except for the microprocessor and associated memories, are powered off.
  • Fig4C represents an exemplary embodiment of the same Femtocell when in a wake interval of the IDLE mode.
  • the Femtocell in addition to the microprocessor and associated memories, the Femtocell also powers on radio components used for transmission, i.e. the F packet reception (RF: Radio Frequency), the RF packet transmission and the RF power amplification.
  • RF Radio Frequency
  • the FPGA Field-Programmable Gate Array
  • the circuitry may be left powered on as well as to preserve the connection of the Femtocell to the network, i.e. the connection to the Serving Gateway or Gateway.
  • the Femtocell to receive incoming request from the network, for example a call incoming from the network directed to an user equipment previously registered by the Femtocell.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de gestion de la consommation d'énergie d'un nœud d'accès local, ledit nœud d'accès local étant dans un mode de fonctionnement appelé mode de repos, le procédé comprenant les étapes suivantes, exécutées par le nœud d'accès local pendant le mode de repos : - après une première durée appelée durée de veille pendant laquelle au moins un composant du nœud d'accès local est hors tension, mettre sous tension au moins l'un des composants hors tension pendant une seconde durée appelée durée d'éveil, - pendant la durée d'éveil, déterminer si un message entrant est reçu par le nœud d'accès local, - si aucun message entrant n'est reçu, passer en mode de veille en mettant hors tension des composants précédemment sous tension.
PCT/CN2012/082380 2012-09-28 2012-09-28 Procédé d'économie d'énergie pour un nœud d'accès radio WO2014047901A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2012/082380 WO2014047901A1 (fr) 2012-09-28 2012-09-28 Procédé d'économie d'énergie pour un nœud d'accès radio
PCT/IB2013/002546 WO2014060839A2 (fr) 2012-09-28 2013-09-27 Procédé d'économie d'énergie pour nœud d'accès radio

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Application Number Priority Date Filing Date Title
PCT/CN2012/082380 WO2014047901A1 (fr) 2012-09-28 2012-09-28 Procédé d'économie d'énergie pour un nœud d'accès radio

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106569879A (zh) * 2016-10-28 2017-04-19 青岛海信移动通信技术股份有限公司 唤醒外设的方法及移动终端
CN111246549A (zh) * 2018-11-29 2020-06-05 航天信息股份有限公司 一种节点休眠、唤醒时间提供的方法及装置

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WO2005125234A2 (fr) * 2004-06-10 2005-12-29 Flarion Technologies, Inc. Teleavertissement efficace dans un systeme de telecommunications sans fil
CN101707796A (zh) * 2009-06-30 2010-05-12 重庆重邮信科通信技术有限公司 一种移动通信终端在空闲模式下的省电方法
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EP2157824A1 (fr) * 2008-08-18 2010-02-24 Nokia Siemens Networks OY Noeud de réseau, réseau et procédé pour activer un noeud de réseau
KR20100132427A (ko) * 2009-06-09 2010-12-17 엘지전자 주식회사 펨토 기지국의 저부하 모드 동작 방법
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WO2011099513A1 (fr) * 2010-02-12 2011-08-18 三菱電機株式会社 Système de communication mobile

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2005125234A2 (fr) * 2004-06-10 2005-12-29 Flarion Technologies, Inc. Teleavertissement efficace dans un systeme de telecommunications sans fil
CN101707796A (zh) * 2009-06-30 2010-05-12 重庆重邮信科通信技术有限公司 一种移动通信终端在空闲模式下的省电方法
US20110176465A1 (en) * 2010-01-21 2011-07-21 Robert Bosch Gmbh Asynchronous low-power multi-channel media access control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106569879A (zh) * 2016-10-28 2017-04-19 青岛海信移动通信技术股份有限公司 唤醒外设的方法及移动终端
CN106569879B (zh) * 2016-10-28 2020-02-11 青岛海信移动通信技术股份有限公司 唤醒外设的方法及移动终端
CN111246549A (zh) * 2018-11-29 2020-06-05 航天信息股份有限公司 一种节点休眠、唤醒时间提供的方法及装置
CN111246549B (zh) * 2018-11-29 2023-01-24 航天信息股份有限公司 一种节点休眠、唤醒时间提供的方法及装置

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WO2014060839A2 (fr) 2014-04-24
WO2014060839A3 (fr) 2014-09-04

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