WO2008020291A2 - Nouvelle sélection de cellule en fonction d'un service - Google Patents

Nouvelle sélection de cellule en fonction d'un service Download PDF

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Publication number
WO2008020291A2
WO2008020291A2 PCT/IB2007/002346 IB2007002346W WO2008020291A2 WO 2008020291 A2 WO2008020291 A2 WO 2008020291A2 IB 2007002346 W IB2007002346 W IB 2007002346W WO 2008020291 A2 WO2008020291 A2 WO 2008020291A2
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WO
WIPO (PCT)
Prior art keywords
service
preference information
radio access
terminal device
service preference
Prior art date
Application number
PCT/IB2007/002346
Other languages
English (en)
Other versions
WO2008020291A3 (fr
Inventor
Vanvinh Phan
Ling Yu
Markku Vainikka
Original Assignee
Nokia Corporation
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
Priority claimed from US11/557,324 external-priority patent/US20080045262A1/en
Application filed by Nokia Corporation filed Critical Nokia Corporation
Publication of WO2008020291A2 publication Critical patent/WO2008020291A2/fr
Publication of WO2008020291A3 publication Critical patent/WO2008020291A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H04W36/008355—Determination of target cell based on user equipment [UE] properties, e.g. UE service capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology

Definitions

  • the present invention relates to methods, a system, a network element, a terminal device and computer program products for cell selection or reselection in a multi- radio network environment involving at least two different radio access technologies.
  • the availability of multiple access alternatives offers the capability of increasing the overall transmission capacity, providing better service quality and reducing the deployment costs for wireless access.
  • different RATs are managed in a co-operative fashion.
  • the multi-RAT environment involves a collection of nodes and/or devices which share a common network control plane through which different cooperation levels in re- source usage can be reached. In this way, synergic cooperation can be achieved among diverse RATs belonging to the same or different operators.
  • the proposed multi-RAT architecture is configured to provide services via access points (APs) belonging to the same or different radio access technologies (RATs) or owners.
  • APs access points
  • RATs radio access technologies
  • the coordination between the available RATs and/or resource owners shall be supported and applicable in case of different level of cooperation among the different entities (RATs and/or owners).
  • the design of the multi-RAT architecture should aim at minimizing the resource usage of terminals devices (e.g., mobile phones, user equipments (UEs), mobile terminals, etc.) in terms of costs, power consumption, and the like. It should be noted that terminals devices (e.g., mobile phones, user equipments (UEs), mobile terminals, etc.) in terms of costs, power consumption, and the like. It should be noted that terminals devices (e.g., mobile phones, user equipments (UEs), mobile terminals, etc.) in terms of costs, power consumption, and the like. It should
  • CONFlRiVlATlON COPY also support terminal devices that have simultaneous direct (terminal to terminal) communication and wireless communication with a fixed infrastructure, as well as terminal devices that communicate via intermediate network elements, including fixed and mobile relays, local access points and repeaters.
  • the multi-RAT architecture should support both legacy (conventional) and new RATs and furthermore allow smooth integration in standardization and deployment by minimizing the changes to future releases of legacy RATs.
  • LTE long-term evolution
  • 3GPP 3 rd Generation Part- nership Project
  • UTRAN Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network
  • UMTS Universal Mobile Telecommunications System
  • E-UTRAN E-UTRAN
  • LTE and 3G and/or 2G e.g. LTE and 3G and/or 2G.
  • cell reselection criteria for the UE are of importance for efficient network operation.
  • the UE may regularly search for a better cell according to the cell reselection criteria. If a better cell is found, that cell is selected. Further details concerning cell selection and reselection issues of current 3G networks can be found in the 3GPP Technical Specifications (TS) 25.304 and 23.122.
  • TS Technical Specifications
  • a problem involved in cell selection or reselection is to determine which RAT cell should be used for which service purpose of the UE so that the utility of the network resources is balanced and optimum while providing high quality of service (QoS) to the UE and avoiding inter-RAT handover as much as possible.
  • QoS quality of service
  • This object is achieved on the terminal side by a method comprising: • detecting at a terminal device a service preference information indicating service preferences for different radio access technologies; and
  • a terminal device comprising:
  • detecting means for detecting in a downlink signal a service preference information indicating service preferences for different radio access technologies
  • selecting means for selecting based on said detected service preference information a serving cell out of at least two available cells of different radio access technologies.
  • a network element comprising:
  • setting means for setting a service preference information indicating service preferences for different radio access technologies
  • signaling means for signaling said service preference information to at least one terminal device.
  • a simple and effective solution is proposed for signaling service- based cell selection or reselection criteria to the terminal device. This enables the network to control the terminal device to access a suitable RAT cell for a certain service in an overlaid multi-RAT environment.
  • the proposed service preference information can be used as a service-based condition for triggering an inter-RAT handover as well.
  • a simple solution is proposed, which allows the network to control the terminal device upon initiating access for a certain service in an overlaid multi-RAT environment. This in turn enhances network utilization, operation and performance.
  • the service preference information may be signaled and detected in various kinds of network messages, such as for example in at least one of a received broadcast system information, a capability information confirmation received during a negotiation procedure, a received location update confirmation, and a received paging message for an incoming call.
  • the service preference information may thus be embedded in at least one of a broadcast system information, a capability negotiation with said terminal device, and a network policy enforcement during initial access and registration.
  • the service preference information may be conveyed and subsequently detected in an information element of a radio resource control message.
  • the service preference information may indicate a service- dependent priority of a first radio access technology over at least one a second radio access technology.
  • the selection may be configured to trigger an inter-radio access technology handover.
  • the inter-radio access technology handover may be prepared from the network side before call set-up
  • FIG. 1 shows a schematic diagram of a multi-RAT network architecture according to the embodiment
  • Fig. 2 shows a schematic diagram indicating a possible multi-RAT cell coverage of the embodiment
  • Figs. 3A to 3D show a signaling diagrams of different signaling options or alternatives according to the embodiment
  • Fig. 4 shows a schematic block diagram of a signaling system according to the embodiment.
  • Fig. 5 shows a schematic block diagram of a computer-based implementation of the embodiment.
  • E-UTRAN an LTE access of 3GPP UTRAN, called E-UTRAN
  • other RATs such as 3G (e.g. UMTS) and/or 2G (e.g. GSM) technology.
  • 3G e.g. UMTS
  • 2G e.g. GSM
  • Multiple overlaid cells are operated, in which the different RATs are used in a common or shared administrative domain of the operator(s), and all cells are available for use by the terminal devices (e.g. UEs).
  • the present invention can be applied to any other network architecture with different radio access technologies.
  • Fig. 1 shows a schematic diagram of the multi-RAT network architecture according to the embodiment.
  • AP access point
  • LTE-RAT AP 22 which may be an enhanced Node B (eNB).
  • eNB enhanced Node B
  • the other two RAT APs 21 and 23 are based on a respective other access technologies RAT1 (e.g. a 3G technology) and RAT2 (e.g. a 2G technology), respectively.
  • RAT1 e.g. a 3G technology
  • RAT2 e.g. a 2G technology
  • All RAT APs are network nodes or elements which terminate the respective RAT specific physical layer and optionally also some all RAT specific layer 2 functions, so as to provide access to a transport network 30 which may be based on a collection of network nodes or elements and/or devices which may share a common network control plane through which different cooperation levels in resource usage can be reached.
  • the RAT AP 23 may be a GSM base transceiver station (BTS) which is coupled to the transport network 30 via a GSM base station controller (BSC) and a UMTS mobile switching center (MSC) or a GPRS (General Packet Radio System) Support Node (GSN).
  • BSC GSM base station controller
  • MSC UMTS mobile switching center
  • GSN General Packet Radio System
  • the RAT AP 21 may be an UTRAN node B which is coupled to the transport network 30 via a UTRAN radio network controller (RNC), and a UMTS MSC/GSN.
  • RNC UTRAN radio network controller
  • the different RAT APs 21 to 23 provide access for a terminal device 10 (e.g. mo- bile phones, UEs, or any other form of a variety of different wireless communication devices, such as a mobile radiotelephone, satellite radiotelephone, wireless networking card, or the like) as long as it is located within their respective cellular coverage areas.
  • a terminal device 10 e.g. mo- bile phones, UEs, or any other form of a variety of different wireless communication devices, such as a mobile radiotelephone, satellite radiotelephone, wireless networking card, or the like
  • Fig. 2 shows different cells C1 to C3 associated with the above RAT APs 21 to 23, respectively.
  • the first cell C1 indicates the coverage area of the left RAT AP 21 with RAT1 technology (e.g. UTRAN)
  • the second cell C2 indicates the coverage area of the left LTE RAT AP 22 with enhanced LTE access technology
  • the third cell C3 indicates the coverage area of the right RAT AP 23 with RAT2 tech- nology (e.g. GSM).
  • the terminal device 10 implements a process that controls selection and reselection of cells associated with the different RAT types, i.e. , inter- RAT cell reselection.
  • a process that controls selection and reselection of cells associated with the different RAT types, i.e. , inter- RAT cell reselection.
  • the terminal device 10 when the terminal device 10 is in the third cell C3 with a RAT2 (e.g. GSM) idle mode, it may perform signal measurements of the neighboring RAT1 (e.g. UTRAN) cell C1 or LTE cell C2. If the terminal device 10 determines that the neighboring cell C1 provides better signalling conditions, it selects the neighboring cell C1 with RAT1 technology for communication services.
  • the neighboring RAT1 e.g. UTRAN
  • the terminal device 10 Upon selection of the neighboring cell C1 , the terminal device 10 switches to the RAT1 communication mode and attempts to "camp on" the RAT1 cell C1. To successfully camp on the RAT1 cell C1 , however, the cell C1 must also satisfy other cell selection criteria. Exemplary cell selection criteria for UTRAN are specified foe example in the 3GPP Technical Specification (TS) 25.304. If the RAT1 cell C1 does not satisfy the cell selection criteria, the terminal device 10 deselects the RAT1 cell C1 and switches back to the RAT2 mode. In such an overlaid multi-RAT environment, cell reselection criteria are of importance for efficient network operation.
  • TS 3GPP Technical Specification
  • a service preference information is provided which indicates which RAT cell should be used for which service purpose of the terminal device 10 so that the utility of the network resources is balanced and optimum while providing high QoS to the terminal device 10 and avoiding inter-RAT handover as much as possible.
  • LTE access technology is rather used to deliver "new" services with good enhancements in terms of cost, quality and security, which are highly valued by the customers.
  • service class table summarizes the LTE service classes for business requirements of the operators:
  • the embodiment provides a simple and effective means of signaling service-based cell-reselection cri- teria to the terminal.
  • This enables the network to control the terminal device 10 to access a suitable RAT cell for a certain service in the overlaid multi-RAT environment.
  • This option can be used as a service-based condition for triggering an inter- RAT handover as well.
  • the broadcast system information provided by the network to the terminal device 10 contains some information about the overlaid multi-RAT environment. Furthermore, the LTE cell C2 is assumed to be also able to support all kinds of packet services.
  • the LTE network indicates to the terminal device 10 preferences on service classes (and applications) which should be served with LTE and different RAT cells.
  • service classes and applications
  • services marked as LTE high driver in the above table could be associated to LTE RAT at the first place and other ser- vices to the other RATs, e.g., RAT1 and RAT2.
  • Fig. 3A shows a first implementation example, where a service preference information is signaled from the LTE AP 22 (e.g. eNB) as a broadcast information to the terminal device 10 (e.g. UE).
  • this broadcast information may be a system information which contains or has embedded the service preference information as an information element "preferred service classes" of information group "cell selection and reselection" of an E-UTRAN information. It can be recommended or signaled to all terminal devices in the broadcast information system, specific to each RAT. In this way the information is valid to all terminal devices.
  • Fig. 3B shows a second implementation example where signaling is performed on a per-call basis.
  • the service preference information indicating the preferred RAT is included or embedded in a paging message, e.g., when the terminal device 10 is paged for an incoming call.
  • the per-call control can be more specific, so that the network can inform the terminal device 10 about the most preferable RAT which should be selected in order to answer the incoming call.
  • the service preference information can be signaled in an information element "preferred RAT info for cell reselection" of the paging record.
  • the terminal device 10 For a network-originated call to the terminal device 10 in idle mode, the terminal device 10 will be paged first via the current RAT cell in which its idle state has been maintained. This may result in an inter-RAT handover triggered by the ex- pected service. But the network can prepare the inter-RAT handover beforehand to reduce the call setup delay.
  • Fig. 3C shows a third implementation example where signaling is performed on a per-location basis.
  • the service preference information indicating the preferred RAT is signaled during capability negotiation where the terminal device 10 negotiates multi-RAT capabilities with the network system.
  • the terminal device 10 indicates its multi-RAT capabilities to the network in a UE capability information message.
  • the network responds with a UE capability informa- tion confirmation message which may include or have embedded the proposed service preference information as a cell selection or reselection information. It is assumed here that the network is operating on multi-RAT environment with certain or full awareness.
  • Fig. 3D shows a fourth implementation example where signaling is also performed on a per-location basis.
  • the service preference information indicating the preferred RAT is signaled during location update.
  • the terminal device 10 signals a location update request to the network.
  • the network responds with a location update confirmation message which may include or have embed- ded the proposed service preference information as a cell selection or reselection information. It is again assumed that the network is operating on multi-RAT environment with certain or full awareness.
  • signaling to individual ter- minal devices can be performed during initial access or registration to a new administrative domain.
  • the subscription profile of the terminal device 10 can be taken into account to configure some QoS differentiation right at this stage.
  • the terminal device 10 can now use the aforementioned service preference information and the service awareness of the upcoming call to perform cell reselection if needed for using the appropriate RAT. For instance, the terminal device 10 re- selects the LTE RAT cell C2 for the LTE-driver services indicated in the above table.
  • the above proposed signalling procedure can be applied for any type of RAT by using suitable messages (e.g. radio resource control (RRC) messages) into which the above service preference information can be embedded as information element or the like.
  • RRC radio resource control
  • Fig. 4 shows schematic block diagrams of a network element 40 which may be part of the transport network 30 or which may correspond to one of the RAT APs 21 to 23 indicated in Fig. 1 and adapted to provide the proposed signalling function according to the embodiment.
  • the network element 40 comprises a service preference table or memory 420 in which preferred RATs are allocated to different service types which can be offered via the network 30.
  • the service preference information stored in the service preference memory 420 may be based on the above service class table, and may be set by the operator(s) of the different RATs provided in the multi-RAT architecture.
  • a message generation functionality 410 embeds or adds the specific service preference information e.g. as information element to individual messages, such as those described in connection with Figs. 3A to 3D, so as to be signalled to the terminal de- vice 10.
  • a detection functionality 110 is provided for detecting and interpreting the service preference information added to or embedded in the respective message, and for providing the detected service preference information to a cell selection or reselection functionality 120 configured to initiate a cell selection, reselection or inter-RAT handover based on the detected service preference information.
  • Fig. 5 shows a schematic block diagram of a software-based implementation of the network side and the terminal side.
  • the network element 40 and/or the terminal device 10 each comprise a processing unit 210, which may be any processor or computer device with a control unit which performs control based on a software routines of a control program stored in a memory 212.
  • Program code instructions are fetched from the memory 212 and are loaded to the control unit of the processing unit 210 in order to perform the processing steps of the above functionalities described in connection with Fig. 4.
  • These processing steps may be per- formed on the basis of input data Dl and may generate output data DO, wherein the input and output data Dl, DO may related to the control signaling required at the respective functionality.
  • a flexible and rather straightforward signalling option is provided which can be embedded into or added to broadcast system information, UE capability negotiation, or network policy enforcement during initial access and registration or during other suitable opportunities.
  • a service preference information which indicates service preferences for different radio access technologies can be set at a network element and can be sent to at least one terminal device.
  • the service preference information is detected and a serving cell is selected based on the detected service preference information.
  • the network is capable of performing service-based control of cell selection or reselection of the terminal device upon initiating access for a certain service in an overlaid multi-RAT environment. This in turn enhances network utility, operation and performance.
  • the present invention is not restricted to the embodiment described above, but can be implemented in any network environment involving different radio access technologies which can be used selectively. Any signaling means or message can be used for transferring the service preference information to a terminal device.
  • the service preference information my even be obtained based on a retrieval, download or access operation initiated by the terminal device.
  • the embodiment may thus vary within the scope of the attached claims.

Abstract

La présente invention concerne des procédés, un système, un élément de réseau, un dispositif terminal et un programme informatique destinés à la sélection ou la nouvelle sélection de cellule dans un environnement réseau à plusieurs radios impliquant au moins deux technologies différentes d'accès radio. Des informations de préférence de service qui indiquent des préférences de service pour différentes technologies d'accès radio peuvent être configurées dans un élément de réseau et sont envoyées à au moins un dispositif terminal. Au dispositif terminal, les informations de préférence de service sont détectées et une cellule de desserte est sélectionnée en fonction des informations de préférence de service détectées. Ainsi, le réseau est capable d'effectuer, en fonction du service, une commande de sélection ou nouvelle sélection de cellule du dispositif terminal à l'initialisation d'accès pour un certain service dans un environnement multi-RAT en cascade. Cela améliore ainsi l'usage, le fonctionnement et les performances du réseau.
PCT/IB2007/002346 2006-08-16 2007-08-14 Nouvelle sélection de cellule en fonction d'un service WO2008020291A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP06017056.0 2006-08-16
EP06017056 2006-08-16
US11/557,324 US20080045262A1 (en) 2006-08-16 2006-11-07 Method and Apparatus for Providing Service-Based Cell Reselection
US11/557,324 2006-11-07

Publications (2)

Publication Number Publication Date
WO2008020291A2 true WO2008020291A2 (fr) 2008-02-21
WO2008020291A3 WO2008020291A3 (fr) 2008-04-17

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2114095A1 (fr) * 2008-04-30 2009-11-04 Nokia Siemens Networks Oy Procédé et dispositif pour sélectionner un noeud de réseau pour le transfert et système de communication comprenant un tel dispositif
EP2262312A1 (fr) * 2009-06-12 2010-12-15 Research In Motion Limited Procédé et appareil pour gérer le transfert d'un mobile
EP3537769A4 (fr) * 2016-11-02 2020-06-17 NTT Docomo, Inc. Dispositif d'utilisateur et procédé de commande d'accès
GB2624207A (en) * 2022-11-10 2024-05-15 Nokia Technologies Oy Cell selection for a user equipment

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Publication number Priority date Publication date Assignee Title
WO2002009464A1 (fr) * 2000-07-25 2002-01-31 Siemens Aktiengesellschaft Procede de selection amelioree de cellules pour stations radio multimodes au repos
US20020177466A1 (en) * 2001-05-09 2002-11-28 Pasi Laurila Call control for user equipment
US6600917B1 (en) * 1999-10-04 2003-07-29 Telefonaktiebolaget Lm Ericsson (Publ) Telecommunications network broadcasting of service capabilities

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6600917B1 (en) * 1999-10-04 2003-07-29 Telefonaktiebolaget Lm Ericsson (Publ) Telecommunications network broadcasting of service capabilities
WO2002009464A1 (fr) * 2000-07-25 2002-01-31 Siemens Aktiengesellschaft Procede de selection amelioree de cellules pour stations radio multimodes au repos
US20020177466A1 (en) * 2001-05-09 2002-11-28 Pasi Laurila Call control for user equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2114095A1 (fr) * 2008-04-30 2009-11-04 Nokia Siemens Networks Oy Procédé et dispositif pour sélectionner un noeud de réseau pour le transfert et système de communication comprenant un tel dispositif
WO2009133051A1 (fr) * 2008-04-30 2009-11-05 Nokia Siemens Networks Oy Procédé et dispostif permettant de sélectionner un noeud réseau pour un transfert intercellulaire et système de communication comprenant un tel dispositif
EP2262312A1 (fr) * 2009-06-12 2010-12-15 Research In Motion Limited Procédé et appareil pour gérer le transfert d'un mobile
CN102461260A (zh) * 2009-06-12 2012-05-16 捷讯研究有限公司 管理移动切换的方法和设备
US8229436B2 (en) 2009-06-12 2012-07-24 Research In Motion Limited Methods and apparatus for managing mobile handover
US8509782B2 (en) 2009-06-12 2013-08-13 Research In Motion Limited Methods and apparatus for managing mobile handover
AU2010258041B2 (en) * 2009-06-12 2014-05-01 Blackberry Limited Methods and apparatus for managing mobile handover
EP3537769A4 (fr) * 2016-11-02 2020-06-17 NTT Docomo, Inc. Dispositif d'utilisateur et procédé de commande d'accès
GB2624207A (en) * 2022-11-10 2024-05-15 Nokia Technologies Oy Cell selection for a user equipment

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