WO2005101887A1 - Reseau sans fil commandant l'occurrence temporelle du balayage spectral d'un terminal sans fil bimode - Google Patents

Reseau sans fil commandant l'occurrence temporelle du balayage spectral d'un terminal sans fil bimode Download PDF

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Publication number
WO2005101887A1
WO2005101887A1 PCT/IB2005/051219 IB2005051219W WO2005101887A1 WO 2005101887 A1 WO2005101887 A1 WO 2005101887A1 IB 2005051219 W IB2005051219 W IB 2005051219W WO 2005101887 A1 WO2005101887 A1 WO 2005101887A1
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WO
WIPO (PCT)
Prior art keywords
network
location
dual mode
mode terminal
terminal
Prior art date
Application number
PCT/IB2005/051219
Other languages
English (en)
Inventor
Paul Bucknell
Matthew P. J. Baker
David H. Evans
Timothy J. Moulsley
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2005101887A1 publication Critical patent/WO2005101887A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the invention relates to a dual mode termi nal operable on a first 5 wireless network and on a second wireless network, to a wireless system comprising such a dual mode terminal, to a method of operating a wireless system comprising such a dual mode terminal, and to a device for operation on a wireless network.
  • the Universal Mobile Telecommunications System is a third generation mobile communications system providing voice and information services to mobile users.
  • UMTS can provide mobile users with high bit rate connections for them to access rich multimedia services.
  • PLMN Public 15 Land Mobile Network
  • WLAN wireless local area network
  • the user will have an UMTS/WLAN dual mode terminal capable of communicating both via the UMTS air interface and via the WLAN air interface.
  • the dual 20 mode terminal may be a stand-alone device or may be implemented as a supplementary device such on a card for use in conjunction with a personal computer.
  • the WLAN With loose coupling the WLAN is complementary to the UMTS network and uses only subscriber information held in the UMTS network. With tight coupling there is a direct connection between the UMTS core network (or even the Radio Network Controller (RNC)) and the WLAN, so that the WLAN is effectively just another radio access network (or even another cell) for the UMTS network. In general, the coverage provided by a WLAN is less extensive that the coverage provided by a UMTS cell.
  • WO2004/002051 addresses inter-working between UMTS and a WLAN, in particular the registration of a WLAN as a UMTS routing area for the purpose of location.
  • WO 2004/006447A2 addresses inter-working between UMTS and a WLAN using an Internet Protocol (IP) with the WLAN handover support provided via the UMTS lur interface between two RNCs.
  • IP Internet Protocol
  • a dual mode WLAN/UMTS terminal while operating on the UMTS network, scans all the time for a WLAN connection then rapid switching between networks is possible, but the power consumption of the terminal will be very high.
  • the dual mode terminal scans less often, the handover process will take longer and the effective coverage ares of the WLAN will be reduced as the terminal moves through the actual coverage area.
  • An object of the invention is to enable a reduction in power consumption of a dual mode terminal.
  • a method of operating a wireless system comprising a first network and a dual mode terminal operable on the first network and on a second network, the method comprising: at the first network, transmitting a scanning control message; and at the dual mode terminal, whilst operating on the first network, receiving the scanning control message; determining the presence of a second network by spectrum scanning; and controlling a time of occurrence of the spectrum scanning in response to receiving the scanning control message.
  • the first network for example a UMTS network, can control the time of occurrence of the spectrum scanning by the dual mode terminal, and hence control the power consumption of the dual mode terminal.
  • the first network can control the speed of switching between networks and the trade-off betw/een power consumption and speed of switching between networks.
  • the effective coverage of the second network can be controlled; if a fast switching speed is used, a moving terminal may transfer to the second network as soon as it moves into the coverage area of the second network, whereas if a slow switching speed is used, a moving terminal will remain connected to the first network for some time after entering the coverage area of the second network.
  • the control of the time of occurrence of the spectrum scanning may include controlling the interval between scans, controlling the duration of scanning, and prohibiting scanning for a period of time.
  • Criteria for controlling the time of occurrence of the spectrum scanning may be, for example, the required service, the available capacity on the first or second network, the proximity of the second network, the capabilities of the dual mode terminal, or the location of the dual mode terminal. Using such criteria, the power consumption can be reduced according to whether the required service can be more efficiently provided on the first or the second network, or according to the availability of the second network.
  • the time of occurrence of the spectrum scanning by the dual mode terminal may be controlled dependent on the location of the dual m ode terminal relative to the location of the second network.
  • the first network may adapt the content of the scanning control message in response to the location of the dual mode terminal, the location being determined either by the first network, or by the dual mode terminal and reported to the first network.
  • the dual mode terminal may adapt the time of occurrence of the spectrum scanning according to its location, for example by determining its proximity to the second network using information transmitted by the first network indicating the location of the second network.
  • the amount of scanning may be reduced when the second network is not expected to be within range of the dual mode terminal, thereby reducing power consumption, and the amount of scanning may be increased when the second network is expected to be within range of the dual mode terminal, thereby enabling a fast handover to the second network.
  • additional information about the second network may be used to control the time of occurrence of the spectrum scanning. Such additional information may include, for example, data about the services supported by the second network, or data about the capacity available in the second network.
  • a dual mode terminal operable on a first wireless network and on a second wireless network, comprising: terminal first receiver means adapted to receive a scanning control message from the first network; terminal second receiver means adapted to determine the presence of a second network by spectrum scanning; and terminal control means adapted to control a time of occurrence of the spectrum scanning in response to receiving the scanning control message.
  • a wireless system comprising a dual mode terminal in accordance with the second aspect of the invention and a network device, the network device comprising a device transmitter adapted to transmit the scanning control message.
  • a device for operation on a first wireless network comprising a transmitter adapted to transmit a scanning control message containing a scanning control instruction for controlling a time of occurrence of spectrum scanning by a dual mode terminal when determining the presence of a second network.
  • Figure 1 is a block schematic diagram of a wireless system
  • Figure 2 is a flow chart of one embodiment of a method of operating a wireless system
  • Figure 3 is a flow chart of another embodiment of a method of operating a wireless system.
  • a wireless system comprising a dual mode terminal 100, a first wireless network represented by a network device 200, and a second wireless network 300.
  • the first wireless network may comprise a plurality of network devices 200 and also a plurality of wireless terminals.
  • the first wireless network may be a UMTS network and the network device 200 may be a UMTS base station.
  • the network device 200 comprises a transmitter 210 (Tx) and a receiver 220 (Rx). An output of the transmitter 210 and an input of the receiver 220 are coupled to an antenna 230. Coupled to the transmitter 210 and receiver 220 is a control means 250 ( ⁇ C), which may be for example a processor. Optionally, coupled to the control means 250 is a location means 260 (L) for determining the location of the dual mode terminals 100, and storage means 270 (S) for storing data about one or more second wireless networks 300.
  • the second wireless network 300 comprises a plurality of wireless devices 310, 320; each of these wireless device may be either an access point 310 or a user equipment 320.
  • the wireless network 300 may be a WLAN network operating in accordance with the IEEE 802.11 standard.
  • the dual mode terminal 100 comprises a first transceiver 110 having a first transmitter portion Tx1 and a first receiver portion Rx1, and a second transceiver 120 having a second transmitter portion Tx2 and a second receiver portion Rx2.
  • the first transceiver 110 is coupled to a first antenna 130
  • the second transceiver 120 is coupled to a second antenna 140.
  • the first transceiver 110 is adapted to communicate with the network device 200 using the air interface protocol of the first wireless network, for example UMTS.
  • the second transceiver 120 is adapted to communicate with the second wireless network 300 using the air interface protocol of the second wireless network 300, for example IEEE802.11.
  • first transceiver 110 and second transceiver 120 are illustrated as separate transceiver devices, they may be implemented in a common transceiver having at least partial commonality of first and second receiver portions, Rx1 and Rx2, and at least partial commonality of first and second transmitter portions, Tx1 and Tx2. Also, although separate antenna 130, 140 are illustrated for the first and second transceiver 110, 120, a common antenna may be used. Both the first transceiver 110 and the second transceiver 120 are coupled to a control means 150 ( ⁇ C) which may be, for example, a processor.
  • ⁇ C control means 150
  • a location means 160 such as a GPS (Global Positioning System) receiver, for determining the location of the dual mode terminal 100, and storage means 170 (S) for storing data about one or more second wireless networks 300.
  • L location means 160
  • S storage means 170
  • FIG 1 shows steps performed while the dual mode terminal is in communication with the network device 200 to obtain a desired service from the second wireless network 300.
  • those steps shown in boxes with a broken line represent variants and the description will omit these initially; they will be described subsequently.
  • the steps on the left hand side of the flow chart relate to steps performed by the network device 200, and the steps on the right hand side of the flow chart relate to steps performed by the dual mode terminal 100.
  • the transmitter 210 of the network device 200 transmits a scanning control message.
  • the scanning control message contains a scanning control instruction for controlling the time of occurrence of spectrum scanning by the dual mode terminal 100.
  • Such an instruction may take various forms, for example, a scan enable/disable indicator, an indication of the time interval between successive scanning periods, an indication of a range of time intervals between successive scanning periods, thereby enabling a degree of flexibility by the dual mode terminal 100 to trade-off power saving against speed of detecting the second network, an indication of the duration of periods of scanning, or any combination of such indications.
  • the first receiver portion Rx1 of the first transceiver 110 of the dual mode terminal 100 receives the scanning control message and forwards the message to the control means 150.
  • the control means 150 initiates scanning of the wireless spectrum, or adapts any current scanning, by the second receiver portion Rx2 of the second transceiver 120 in accordance with the scanning control message to detect the second network 300.
  • the network device 200 may transmit an indication of the location of the second network 300.
  • This indication may be supplied to the network device 200 from an external device (not illustrated), or may be pre-stored in the storage means 270.
  • this indication of location may be included in the scanning control message or may be included in a separate message.
  • This indication is received by the dual mode terminal at step 520.
  • the dual mode terminal 100 determines its location by means of the location means 160, and reports the location to the control means 150.
  • step 530 the two locations are compared by the control means 150. If the dual mode terminal 100 is within wireless range of the second network 300, according to a predetermined criterion, flow proceeds to step 550.
  • the scanning control message may contain a plurality of alternative scanning control instructions for selection and action by the dual mode terminal 100 according to the outcome of step 530.
  • a short scan period may be specified for use if the dual mode terminal 100 is in close proximity, according to a predetermined criterion, to the second network 300, a short scan period being used in this case to effect the handover to the second network 300 in a short period of time, whereas a longer scan period may be specified for use if the distance is greater, in order to minimise power consumption when there is a low probability of detection of the second network 300.
  • the dual mode terminal 100 is not within wireless range of the second network 300, the attempt to gain service from the second network 300 may be terminated at step 540. In this latter case, either the service may be provided on the first network by the network device 200, or the process may be repeated to gain service from a further network, or the attempt to gain service may be abandoned.
  • the control means 150 initiates transmission by the first transmitter portion Tx1 of the first transceiver 1 10 of an indication of the presence of the second network 300.
  • the indication of the presence of the second network 300 is received by the receiver 220 of the network device 200 and reported to the control means 250.
  • the control means 580 initiates transmission of a service control message by the transmitter 210.
  • the dual mode terminal 100 receives service from the second network 300 by means of the second transceiver 120 in response to receiving the service control message via the first receiver portion Rx1 of the first transceiver 1 10.
  • the indication of the location of the second network 300 may be stored in the storage means 170 for use in subsequent comparisons of location.
  • FIG. 3 Another embodiment of the invention is illustrated in the flow chart of Figure 3.
  • the steps on the left hand side of the flow chart relate to steps performed by the network device 200
  • the steps on the right hand side of the flow chart relate to steps performed by the dual mode terminal 100.
  • the dual mode terminal 100 determines its location by means of the location means 160 and reports the location to the control means 150.
  • the control means 150 initiates transmission by the first transmitter portion Tx1 of the first transceiver 110 of an indication of the location. This indication is received at the network device 200 by the receiver 220 and at step 630 the control means 250 compares the received indication of location of the dual mode terminal 100 with a location of the second network
  • step 510 If the dual mode terminal 100 is within wireless range of the second network 300, according to a predetermined criterion, flow proceeds to step 510 and to subsequent steps identical to those in the flow chart of Figure 1 having the same reference numerals. However, if the dual mode terminal 100 is not within wireless range of the second network
  • the attempt to gain service from the second network 300 may be terminated, in which case either the service may be provided on the first network by the network device 200, or the dual mode terminal may be commanded to search for a further network, or the attempt to gain service may be abandoned.
  • the content of the scanning control message may be adapted by the control means 250 according to the result of the comparison at step 630. For example, if the dual mode terminal 100 is in close proximity, according to a predetermined criterion, to the second network 300, a short scan period may be specified as being sufficient to detect the presence of the second network 300, thereby minimising power consumption, whereas if the distance is greater a longer scan period may be specified in order to ensure reliable detection of the second network 300.
  • the transmission of the scanning control message, or the adaptation of the content of the scanning control message may be responsive to an indication of the presence of the second network received from a further terminal.
  • information about the availability of the second network may be combined from more than one source, thereby enabling scanning control to be implemented with improved reliability.
  • the indication of the presence of the second network may be transmitted automatically on detection of such a network, or in response to a user requesting a service, for example a user requesting the use of a WLAN.
  • the scanning control message may be transmitted as a broadcast message to all dual mode terminals operating on the first network, or may be addressed to one or more specific dual mode terminals requiring a service, or may be addressed to a sub-set of the dual mode terminals operating on the first network in a particular location or a particular coverage cell.
  • the invention has been described with reference to the first network being a UMTS network and the second network 300 being a WLAN, the invention is also applicable to other types of network including GSM (Global System for Mobile Communication), GPRS (Generalised Packet Radio Service, CDMA2000 (Code Division Multiple Access 2000), DECT (Digital European Cordless Telephone), BluetoothTM.
  • GSM Global System for Mobile Communication
  • GPRS Generalised Packet Radio Service
  • CDMA2000 Code Division Multiple Access 2000
  • DECT Digital European Cordless Telephone
  • BluetoothTM BluetoothTM.
  • the functional elements of the network device 200 are not necessarily co-located but may be distributed within the first network.
  • the order of steps in the flow charts of Figures 2 and 3 may, to some extent, be varied.
  • the determination of location may occur as a background activity such that the locations are already known when the requirement for providing service from the second network 300 arises.
  • the term "dual mode" in not intended to exclude terminals which are capable of operating on more than two networks.
  • the word "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the word “comprising” does not exclude the presence of other elements or steps than those listed.
  • the inclusion of reference signs in parentheses in the claims is intended to aid understanding and is not intended to be limiting. , From reading the present disclosure, other modifications will be apparent to persons skilled in the art. Such modifications may involve other features which are already known in the art of wireless networks and apparatus and which may be used instead of or in addition to features already described herein.

Abstract

L'invention concerne un terminal sans fil bimode (100) pouvant obtenir des services sur plus d'un réseau. Le terminal, mis en oeuvre sur un premier réseau (200), effectue un balayage de manière à déterminer la disponibilité d'un second réseau (300). La synchronisation du balayage est commandée par des messages de commande de balayage émis par le premier réseau (200).
PCT/IB2005/051219 2004-04-15 2005-04-13 Reseau sans fil commandant l'occurrence temporelle du balayage spectral d'un terminal sans fil bimode WO2005101887A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0408417.4 2004-04-15
GB0408417A GB0408417D0 (en) 2004-04-15 2004-04-15 Wireless network

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Cited By (13)

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WO2007123794A2 (fr) * 2006-04-04 2007-11-01 Kyocera Corporation Procédé de balayage de système et ensemble pour dispositifs de communications sans fil mobiles
EP1942688A1 (fr) * 2007-01-02 2008-07-09 NEC Electronics Corporation Mode d'économie d'énergie dans un terminal radio bi-mode
WO2008090441A1 (fr) * 2007-01-23 2008-07-31 Nokia Corporation Liste de priorité rat pour dispositifs mobiles multi-rat
WO2009000298A1 (fr) * 2007-06-26 2008-12-31 Nec Europe Ltd. Procédé d'optimisation du processus de balayage d'un terminal mobile
WO2009146435A1 (fr) 2008-05-30 2009-12-03 Qualcomm Incorporated Procédé et appareil pour rechercher des signaux dans un système de communication sans fil
WO2010019087A1 (fr) * 2008-08-13 2010-02-18 Telefonaktiebolaget L M Ericsson (Publ) Signalisation de restrictions de couche multiples if/rat
WO2010034114A1 (fr) * 2008-09-29 2010-04-01 Nortel Networks Limited Transmission sans fil gigabit
EP2200375A2 (fr) * 2008-12-16 2010-06-23 Electronics and Telecommunications Research Institute Procédé et appareil pour découvrir un système d'accès dans un environnement de système mobile/sans fil multi-accessible
GB2460017B (en) * 2008-05-06 2012-04-11 Samsung Electronics Co Ltd Managing network search and selection
EP2083599A3 (fr) * 2008-01-24 2013-05-29 Fujitsu Limited Terminal de communication sans fil et procédé de contrôle de terminal de communication sans fil
WO2013116650A1 (fr) * 2012-02-03 2013-08-08 Qualcomm Incorporated Mode hybride voix/données
WO2013178147A1 (fr) * 2012-08-10 2013-12-05 中兴通讯股份有限公司 Terminal mobile bimode et à double mise en attente et procédé de mise en oeuvre de double canal correspondant
US9094894B2 (en) 2009-01-23 2015-07-28 Fujitsu Limited Wireless communication terminal and wireless communication terminal control method

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Cited By (30)

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US7706790B2 (en) 2006-04-04 2010-04-27 Kyocera Corporation System scanning method and arrangement for mobile wireless communication devices
WO2007123794A3 (fr) * 2006-04-04 2007-12-27 Kyocera Corp Procédé de balayage de système et ensemble pour dispositifs de communications sans fil mobiles
US8195156B2 (en) 2006-04-04 2012-06-05 Kyocera Corporation System scanning method and arrangement for mobile wireless communication devices
JP2009532986A (ja) * 2006-04-04 2009-09-10 京セラ株式会社 システムスキャン方法および移動無線通信装置の構成
WO2007123794A2 (fr) * 2006-04-04 2007-11-01 Kyocera Corporation Procédé de balayage de système et ensemble pour dispositifs de communications sans fil mobiles
KR101073796B1 (ko) 2006-04-04 2011-10-13 쿄세라 코포레이션 모바일 무선 통신 장치를 위한 시스템 스캐닝 방법 및 장치
JP2011147134A (ja) * 2006-04-04 2011-07-28 Kyocera Corp システムスキャン方法および移動無線通信装置の構成
EP1942688A1 (fr) * 2007-01-02 2008-07-09 NEC Electronics Corporation Mode d'économie d'énergie dans un terminal radio bi-mode
WO2008090441A1 (fr) * 2007-01-23 2008-07-31 Nokia Corporation Liste de priorité rat pour dispositifs mobiles multi-rat
WO2009000298A1 (fr) * 2007-06-26 2008-12-31 Nec Europe Ltd. Procédé d'optimisation du processus de balayage d'un terminal mobile
US8407174B2 (en) 2007-06-26 2013-03-26 Nec Europe Ltd. Method for optimizing the scanning process of a mobile terminal
JP2010531078A (ja) * 2007-06-26 2010-09-16 エヌイーシー ヨーロッパ リミテッド モバイル端末のスキャンプロセスを最適化する方法
KR101140560B1 (ko) 2007-06-26 2012-05-02 엔이씨 유럽 리미티드 이동 단말기의 스캐닝 프로세스를 최적화하는 방법
EP2083599A3 (fr) * 2008-01-24 2013-05-29 Fujitsu Limited Terminal de communication sans fil et procédé de contrôle de terminal de communication sans fil
GB2460017B (en) * 2008-05-06 2012-04-11 Samsung Electronics Co Ltd Managing network search and selection
KR101384957B1 (ko) 2008-05-30 2014-04-11 퀄컴 인코포레이티드 무선 통신 시스템에서 신호들을 탐색하는 방법 및 장치
WO2009146435A1 (fr) 2008-05-30 2009-12-03 Qualcomm Incorporated Procédé et appareil pour rechercher des signaux dans un système de communication sans fil
US8175567B2 (en) 2008-05-30 2012-05-08 Qualcomm Incorporated Method and apparatus for searching for signals in a wireless communication system
JP2011530949A (ja) * 2008-08-13 2011-12-22 テレフオンアクチーボラゲット エル エム エリクソン（パブル） マルチｉｆ／ｒａｔレイヤ制限の報告
US8588846B2 (en) 2008-08-13 2013-11-19 Telefonaktiebolaget L M Ericsson (Publ) Reporting of multiple IF/RAT layer restrictions
WO2010019087A1 (fr) * 2008-08-13 2010-02-18 Telefonaktiebolaget L M Ericsson (Publ) Signalisation de restrictions de couche multiples if/rat
WO2010034114A1 (fr) * 2008-09-29 2010-04-01 Nortel Networks Limited Transmission sans fil gigabit
EP2200375A2 (fr) * 2008-12-16 2010-06-23 Electronics and Telecommunications Research Institute Procédé et appareil pour découvrir un système d'accès dans un environnement de système mobile/sans fil multi-accessible
EP2200375A3 (fr) * 2008-12-16 2014-02-12 Electronics and Telecommunications Research Institute Procédé et appareil pour découvrir un système d'accès dans un environnement de système mobile/sans fil multi-accessible
US9094894B2 (en) 2009-01-23 2015-07-28 Fujitsu Limited Wireless communication terminal and wireless communication terminal control method
WO2013116650A1 (fr) * 2012-02-03 2013-08-08 Qualcomm Incorporated Mode hybride voix/données
US9370043B2 (en) 2012-02-03 2016-06-14 Qualcomm Incorporated Voice/data hybrid mode
EP3145267A1 (fr) * 2012-02-03 2017-03-22 QUALCOMM Incorporated Équipment utilisateur à technologie d'accès radio double
WO2013178147A1 (fr) * 2012-08-10 2013-12-05 中兴通讯股份有限公司 Terminal mobile bimode et à double mise en attente et procédé de mise en oeuvre de double canal correspondant
US9479639B2 (en) 2012-08-10 2016-10-25 Zte Corporation Dual-mode and dual-standby mobile terminal and dual-channel implementation method thereof

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