WO2010020293A1 - Procédé, terminal et station de base pour sélectionner dans un terminal une cellule pour le terminal - Google Patents

Procédé, terminal et station de base pour sélectionner dans un terminal une cellule pour le terminal Download PDF

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Publication number
WO2010020293A1
WO2010020293A1 PCT/EP2008/061051 EP2008061051W WO2010020293A1 WO 2010020293 A1 WO2010020293 A1 WO 2010020293A1 EP 2008061051 W EP2008061051 W EP 2008061051W WO 2010020293 A1 WO2010020293 A1 WO 2010020293A1
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WO
WIPO (PCT)
Prior art keywords
cell
base station
terminal
access
access parameter
Prior art date
Application number
PCT/EP2008/061051
Other languages
English (en)
Inventor
Angelo Centonza
Simon Paul Davis
David Philip Hole
Leonardo Provvedi
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
Application filed by Nokia Corporation filed Critical Nokia Corporation
Priority to PCT/EP2008/061051 priority Critical patent/WO2010020293A1/fr
Publication of WO2010020293A1 publication Critical patent/WO2010020293A1/fr

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J11/00Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069Cell search, i.e. determining cell identity [cell-ID]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information

Definitions

  • the present invention relates to the technical field of communication networks, e.g. wireless communication networks.
  • the present invention relates to a method for indicating to a terminal the presence of an accessible cell, to a method for accessing a second cell by a terminal, to a method for providing an access parameter by a first Base Station to a terminal, to a method for providing an access parameter to a first Base Station by a second Base Station, to a method in a Base Station for signalling the availability of information about an available other cell, to a program element, to a terminal for selecting a cell for the terminal, to a Base Station for providing an access parameter to a terminal, to a Base Station for providing an access parameter to a first Base Station and to a signalling apparatus for signalling the availability of information about an available other cell.
  • One concept may define macro cells and home cells.
  • Macro cells commonly denote legacy cells, cells which already have been installed and which cover a large physical area.
  • Home cells may be cells which have a smaller footprint than a macro cell and thus may allow a fine planning of a coverage. In other words, this may mean that a home cell, a pico cell or a femto cell may allow in a small area to provide capacity to provide this small area with the availability of mobile services .
  • a home cell may be used to increase within a macro cell at certain predefined areas the capacity. Such certain areas may be shopping malls, train stations, universities or private homes.
  • franchise companies may employ home cells, to offer to their customers special mobile services when the customers are nearby physical locations of the shops, e.g. coffee shops. For example, such franchise companies may offer accessing a cellular network at reduced costs. Such value added services may increase the customer loyalty.
  • WiMAX® Forum network architecture stage 3: Detailed protocols and procedures
  • release 1 version 1.2, 11 January 2008
  • WiMAX Forum a network entry discovery and selection procedure may be known.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • V5.6.0, 2003-04 from the 3rd Generation Partnership Project, specifies procedures for layers of the radio interface, the interface between the GSM/EDGE Radio Access Network (GERAN) and the Mobile Station (MS) .
  • GERAN GSM/EDGE Radio Access Network
  • MS Mobile Station
  • a method for indicating to a terminal the presence of an accessible cell may be provided.
  • the method may comprise providing terminal-specific restriction information for possible cell access to a first base station and receiving in the terminal an indication of the existence of an available second cell, wherein the second cell may meet the terminal-specific restriction information.
  • the first base station may control a first cell.
  • the terminal may be connected to the first cell.
  • a method for accessing a cell or a second cell by a terminal may be provided.
  • the method may comprise receiving in the terminal information about the presence of at least one cell or at least one second cell, displaying the information on the terminal, e.g. on a monitor of the terminal and receiving a trigger for starting searching an accessible cell or second cell.
  • the trigger may be a manual or mechanical operation of a user, e.g. pushing a button.
  • the trigger may be an automatic trigger .
  • a method for providing an access parameter by a first Base Station to a terminal may be provided.
  • the method may comprise storing in the first Base Station an access parameter for at least one available second cell, wherein the first Base Station may control a first cell and wherein a second Base Station may control the second cell.
  • the method may further comprise receiving in the first Base Station terminal-specific restriction information for possible cell access for the terminal and selecting from the stored access parameter such an access parameter of available second cells, which second cells meet the terminal-specific restriction information.
  • the access parameter may be a plurality of access parameter, e.g. a list or a set of access parameter.
  • the terminal may inform the first Base Station about restrictions, rules or policies, which the terminal may have for accessing cells.
  • the method may further comprise selecting from the stored access parameter such access parameter of available second cells, which second cells may meet the terminal specific restriction information.
  • the selected access parameter or location-specific information may be transmitted to the terminal.
  • a method for providing an access parameter or at least one access parameter to a first Base Station by a second Base Station may be provided, wherein the method may comprise connecting the second Base Station to the first Base Station.
  • the first Base Station may control a first cell and the second Base Station may generate or control a second cell.
  • the second Base Station may provide an access parameter for the second cell to the first Base Station .
  • the second cell may be overlayed by the first cell and the second Base Station may provide the access parameter to an administrative device inside the first Base Station or to a Closed Subscriber Group table in the first Base Station.
  • a method in a Base Station for signalling the availability of information about an available other cell may be provided, wherein the method may comprise sending an indication whether the Base Station may have information about an available other cell and/or sending an indication whether the Base Station is capable to provide an access parameter and/or sending an indication that the Base Station may have detected at least one other cell in a predefined distance of the Base Station or nearby the Base Station.
  • an other cell or second cell may be determined in a predefined distance of the Base Station.
  • program element may be provided, which program element, when being executed by a processor may be adapted to carry out at least one method selected from the group of methods consisting of the method for selecting in a terminal a cell for the terminal, the method for accessing a second cell by a terminal, the method for providing an access parameter by a first Base Station to a terminal, the method for providing an access parameter by a second Base Station to a first Base Station and the method in a Base Station for signalling the availability of information about an available other cell.
  • a computer-readable medium may be provided, wherein the computer-readable medium may comprise program code, which program code, when being executed by a processor may be adapted to carry out at least one method selected from the group of methods consisting of the method for selecting in a terminal a cell for the terminal, the method for accessing a second cell by a terminal, the method for providing an access parameter by a first Base Station to a terminal, the method for providing an access parameter by a second Base Station to a first Base Station and the method in a Base Station for signalling the availability of information about an available other cell.
  • a computer-readable medium may be a floppy disk, a harddisk, an USB (Universal Serial Bus) storage device, a RAM (Random Access Memory) , a ROM (Read Only Memory) and an EPROM (Erasable Programmable Read Only Memory) .
  • a computer-readable medium may also be a data communication network, e.g. the Internet, which may allow downloading a program code.
  • a terminal for selecting a cell for the terminal may be provided.
  • the terminal may comprise a terminal controller device and a cell determining device.
  • the terminal controller device may be adapted for providing terminal-specific restriction information for possible cell access for the terminal.
  • the terminal controller device may also be adapted for determining a first cell to which the terminal may be connected.
  • the terminal controller device may be adapted for determining a first cell to which the terminal may be connected.
  • the cell determining device may be adapted for providing access parameters and/or other information such as CSG ID to a first base station in order for the first base station to construct a CSG table.
  • the terminal may be able to provide access parameters and/or other information if the terminal may previously have detected the presence of the second cell.
  • the first cell may be controlled by a first base station or by a first base station controller.
  • the cell determining device may be adapted for providing the terminal-specific restriction information to the first base station and for receiving in the terminal indication of the existence of an available second cell meeting the terminal-specific restriction information.
  • a terminal for accessing a cell or a second cell comprising a controller device and a displaying device may be provided.
  • the displaying device may be adapted for displaying the information on the terminal and the controller device may be adapted for receiving in the terminal information about the presence of at least one cell or of at least one second cell and for receiving a trigger for starting searching for an accessible cell or an accessible second cell.
  • a trigger for starting searching for an accessible cell or an accessible second cell may not be needed since searching may start automatically.
  • a Base Station for providing an access parameter to a terminal may be provided.
  • the Base Station may comprise a controller device, and a storage device.
  • the storage device may be adapted for storing in the Base Station an access parameter for at least one available second cell.
  • the Base Station may comprise a cell controlling device, which may be adapted for controlling a first cell.
  • the controller device may be adapted for receiving in the Base Station terminal-specific restriction information for possible cell access for the terminal and for selecting from the stored access parameter such an access parameter of available cells or second cells, which cells or second cells may meet the terminal-specific restriction information.
  • the Base Station may be a Base Station controller or the Base Station may comprise a Base Station controller.
  • a Base Station Controller may be in GSM a BSC (Base Station Controller) and in UMTS a RNC (Radio Network Controller)
  • a Base Station for providing access parameter to a first Base Station may be provided.
  • the Base Station may comprise a controller device, a cell controlling device and a connecting device.
  • the connecting device may be adapted to connect the Base Station to a first Base Station and the cell controlling device may be adapted for controlling a cell or a second cell.
  • the controller device may be adapted for providing access parameter for the cell or for the second cell to the first Base Station.
  • a signalling apparatus for signalling the availability of information about an available other cell.
  • the signalling apparatus may comprise a Base Station and a signalling device.
  • the signalling device may be connected to the base station and the signalling apparatus may be adapted for sending an indication whether the Base Station has information about an available other cell and/or for sending an indication whether the Base Station may be capable to provide an access parameter and/or for sending an indication that the Base Station may have detected at least one other cell in a predefined distance of the Base Station.
  • a Base Station may also mean a sub-system which may comprise multiple systems, e.g. a Base Station Transceiver (BTS) and a Base Station Controller (BSC) .
  • BTS Base Station Transceiver
  • BSC Base Station Controller
  • a home cell may be a Closed Subscriber Group cell, i.e. a cell to which access may be restricted to a Closed Subscriber Group.
  • Examples for a the location of Closed Subscriber group cells may be home areas, campuses (university or business) , stores of a franchise company or coffee shop chains etc..
  • a CSG ID may be the subscription information, i.e. the CSG ID may be seen as a name, an address or an identifier for a defined CSG cell or group of CSG cells.
  • the cell may be geographically close to the Base
  • a CSG cell may be a cell which may only be accessible to subscribers of the corresponding CSG ID.
  • a CSG cell may have one or more CSG IDs associated with it.
  • a terminal may have a subscription to zero or more CSGs meaning the terminal may access zero of more CSG cells with the corresponding CSG ID(s) .
  • the home cell concept may propose to introduce a hierarchy between different cells covering substantially the same physical locations. As long as different physical parameter may be used to generate a cell, such as different frequencies, cellular networks may be operated in an overlay configuration.
  • a coordination instance may be required.
  • an idea of a macro cell / pico cell concept may be to use a macro cell as the coordinating instance of a plurality of pico cells, femto cells, home cells or CSG cells.
  • the footprint of a macro cell may cover or overlay the footprint of at least a part of a plurality of pico cells and/or home cells.
  • the macro cell may be used as the administrating instance, which may control the access of a terminal to different cells.
  • the controller of a base station spanning or generating a macro cell may be used as the administrator.
  • the macro cell may be the umbrella cell for at least a part of a plurality of home cells.
  • a CSG may apply also to UTRAN or other technologies , in particular in technologies allowing access control to network resources.
  • the home cell concept may also have been enriched with the proposal of Closed Subscribers Groups (CSGs) .
  • CSG Closed Subscribers Groups
  • access to a set of one or more cells, in particular to home cells or CSG cells may be substantially permitted only for a predetermined set of UEs (User Equipment) , mobiles or terminals.
  • the permission may be a terminal-specific restriction information, e.g. based on subscription setting.
  • the terminal-specific restriction information may not be known by the first base station.
  • the home cells using UMTS ("3G") and/or LTE technology may attract the interest of operators and manufacturers, since the coverage may be adapted to the shape of traffic. Thus, a more efficient offering of services and a more tailored service bouquet may be offered by an operator.
  • 3G UMTS
  • LTE Long Term Evolution
  • RAT radio access technology
  • Examples for different RATs may be GERAN, UMTS, or LTE.
  • an idea of the invention may be seen in how to make a UE or terminal which may use, either in idle or connected mode, a macro cell using one particular RAT aware that home cells using another RAT may be available within the coverage area of the macro cell.
  • the terminal may be interested in an information about relevant home cells, before the terminal may have to perform measurements, in order to determine the cells available in the neighbourhood of the terminal.
  • the macro cell may be a GSM / GPRS / EDGE cell
  • an accessible, available and/or allowed LTE or UMTS HNB Home NodeB
  • users may get improved data rates from an LTE / UMTS cell and their mobiles may therefore be made aware of the existence of such cells.
  • a mechanism may be provided to indicate when and/or where and /or how a mobile may initiate scanning to search for home cells.
  • the macro Base Station or the terminal may be seen as the instances which may link information available at different places in the network, in order to reduce the effort by finding appropriate cells for connecting.
  • ⁇ a priori' knowledge may be used.
  • not all home cells may be accessible to all terminals e.g. due to the use of CSGs, and the fact that particular TAIs/LAIs may be not allowed for some Ues.
  • home cells may have much smaller coverage than the macro cell. This may be interesting, in cases where the terminal may move at a high speed.
  • storing of the location of all allowed home cells by the terminal may not be feasible if the number of allowed home cells may be very high.
  • a general technique may be provided to distribute information to terminals about home cells present within a macro cell.
  • enhancing the home cell detection procedure may be suggested.
  • the techniques disclosed for home cells of different RAT as the macro cells may also be applied to home cells of the same RAT as the macro cell.
  • Degradation of ongoing connections or of established connections may be caused by the terminal needing processing power to report measurements and to decode system information for cells which cells the terminal will not be able to access. The processing power may not be used for maintaining the established connection. Degradation of ongoing connections may be caused by the terminal needing to temporarily suspend the ongoing connection in order to perform measurements, e.g. signal strength measurements, or decode system information, or to report signal strength measurements.
  • Intra-RAT mobility may concern handing over a terminal between a home cell and a macro cell of the same RAT or the terminal autonomously performing reselection between a home cell and a macro cell of the same RAT.
  • Inter-RAT mobility may concern handing over a terminal between a home cell and a macro cell of different RAT. or the terminal autonomously performing reselection between a home cell and a macro cell of the same RAT.
  • handing over and/or reselecting from macro cell to HNB may be provided.
  • incoming mobility towards the HNB may be controlled by a macro Base Station .
  • inter-RAT IDLE mode mobility may be provided.
  • a high amount of high layer channel decoding may be prevented, e.g. required in order to decode the SIBs. Therefore, unnecessary battery consumption may be prevented caused by decoding in an IDLE mode. Furthermore, degradation of ongoing connections in ACTIVE mode caused by decoding may also be prevented.
  • the power consumption and decoding may be an issue common to all RATs. All RATs may need measurements and thus terminals using any RAT may be subject to increased battery consumption and ACTIVE mode service interruptions. However, the technologies that may sense this impact the most may be the technologies where the user plane bit rates may be low. For services with low bit rates any service interruption due to the need of measurements may perceived as a QoS (Quality of Service) degradation.
  • QoS Quality of Service
  • QoS degradation may happen in the case of inter-RAT mobility between GERAN and 3G/LTE, where a terminal in GERAN ACTIVE mode may have to interrupt its data reception in order to scan for available CSGs and possibly handing over to them either under the control of the network or under autonomous cell reselection in packet transfer mode.
  • enhancing of inbound mobility may be based on providing location-specific information or providing access parameter of an available second cell or of a home cell meeting terminal-specific restriction information to a terminal, depending on which macro cell the terminal may currently be within coverage of.
  • home cells are a subset of CSG cells.
  • An idea of the invention may be seen in offering a method to inform the terminal about a physical access parameter, e.g. the Physical ID or a list of Physical IDs used by home cells, which may be accessible for the terminal.
  • a physical access parameter e.g. the Physical ID or a list of Physical IDs used by home cells, which may be accessible for the terminal.
  • This may provide a much more efficient home cell search based on Physical ID scanning rather than BCCH (Broadcast Control Channel) decoding.
  • a physical layer scanning may save battery power and may have smaller impact on QoS due to measurements and reporting on service bandwidth compared to BCCH decoding.
  • erroneous attempts of camping on non accessible home cells may be reduced.
  • the method indicating to a terminal the presence of an accessible cell may further comprise receiving in the terminal access parameter, in particular physical access parameter, of an available second cell, which cell may meet the terminal-specific restriction information.
  • the probability of connecting to the cell by scanning the cell may be increased.
  • the terminal may determine that the terminal may be allowed to access a cell whose access parameters have been provided by the first base station without needing to decode the system information from that cell.
  • the method for indicating to a terminal the presence of an accessible cell may further comprise scanning the received access parameter.
  • the received access parameter may be a frequency and/or a scrambling code.
  • the received access parameter may be physical identifier.
  • Receiving physical identifier as access parameters such as a Physical Cell identifier, may allow to determine the accessibility of a corresponding cell. In other words, the fact that the terminal may have received a physical parameter in itself may indicate that the terminal may be able to access the cell.
  • Knowledge of the access parameter may be sufficient to permit measurements of the second cell in order to determine whether or not handover or cell reselection towards that cell may occur .
  • the access parameter itself may not provide sufficient information to permit the terminal to determine whether the terminal may be allowed to access that cell, in other words, whether the terminal may have a subscription to access that cell.
  • the second cell may be overlapped by the first cell.
  • the first cell may overlap the second cell.
  • Overlapping of cells may mean that a footprint of the second cell at least partially may lie within the footprint of the first cell. Overlapping the second cell with the first cell may allow to increase in the location of the second cell the capacity within the first cell.
  • overlapping the second cell with the first cell or positioning the second cell at least partially within the first cell may allow to provide access within the second cell via another operator than in the first cell.
  • the other operator may be a franchise company or coffee shop which may want to allow a group of customers or the group of premium customers to access a mobile network at reduced rates while the customers may be in the shop of the franchise company.
  • the second cell may be generated or controlled by a second Base Station and the second Base Station may be a home Base Station which may generate or control a home cell or a CSG cell.
  • the first Base Station may be a macro Base Station and thus, may generate or control a macro cell.
  • a home Base Station may be a Base Station apparatus which may have a smaller size and a lower weight than a macro Base Station.
  • a home Base Station may be installed in a private property or home and may provide access for family members within their home.
  • a home Base Station may have the size of a so-called "pizza box" and may be supplied by home power supply, such as 110 V (Volt) AC or 230 V AC.
  • a home Base Station may comprise a device like a hook for mounting the home Base Station at the wall, and may have a weight of less than 1 kg, in the range of 500 g to 1.5 kg (kilogram) or of less than 5 kg.
  • a macro Base Station may classify or group terminals which may be connected to the macro Base Station and the macro Base Station may decide which terminal may be connected to a home Base Station.
  • the macro Base Station may provide information to the terminal which information may allow the terminal to decide to which cell the terminal may connect.
  • a home Base Station may also be called pico Base Station or femto Base Station.
  • a pico Base Station may control a pico cell and a femto Base Station may control a femto cell.
  • the first cell and the second cell may adopt or may employ a different Radio Access Technology (RAT) .
  • RAT Radio Access Technology
  • the first cell and/or the second cell may adopt a different radio access technology than a macro Base Station.
  • Adopting different radio access technologies may allow inter-RAT handover, i.e. handover of terminals between cells, in particular a macro cell and a micro cell, driven by different technologies.
  • the first cell and the second cell may adopt the same radio access technology. Furthermore, the first cell and/or the second cell may adopt the same radio access technology as a macro Base Station.
  • intra-RAT mobility may be provided, i.e. handover between a macro Base Station and a home Base Station may be made, wherein the macro Base Station may employ the same technology as the home Base Station.
  • the RAT may be at least one technology selected from the group consisting of GERAN (GSM EDGE Radio Access Network) , Universal Mobile Telecommunication Systems (UMTS) and Long-Term Evolution (LTE) .
  • GSM EDGE Radio Access Network GSM EDGE Radio Access Network
  • UMTS Universal Mobile Telecommunication Systems
  • LTE Long-Term Evolution
  • a mobile terminal which, may support at least one of the different radio access technologies may be independent of the technology when accessing a home cell.
  • an operator may operate a home cell employing one technology and another operator may operate a home cell employing another technology.
  • Being able to support different technologies may allow the macro Base Station to handover a terminal to an appropriate home cell.
  • the terminal specific restriction information may comprise at least one restriction information selected from the group consisting of a Closed Subscriber Group identifier (CSG) or a CSG indicator, a closed subscriber group white list, a dedicated closed subscriber group frequency, a location of the terminal, a previously recorded location information, a speed of the terminal, a radio access type capability of the terminal, a frequency band on which the terminal may operate, a prohibited Tracking Area Identifier (TAI ID) , a previously recorded TAI, a prohibited Location Area Identifier (LAI ID) , Routing Area Identifier (RAI ID) , a Global Cell Identifier (GCI), a previously recorded LAI, a time before next request, a macro cell context, a home NodeB (HNB) Hardware Identifier (HW ID) , and a Global Positioning System (GPS) location.
  • CSG Closed Subscriber Group identifier
  • CSG Closed Subscriber Group identifier
  • CSG Closed Subscriber Group identifier
  • the terminal-specific restriction information may comprise policies or rules, in particular access rules.
  • the terminal- specific restriction information may comprise a state of the terminal, such as speed or location, a physical access parameter, such as a frequency or Phy ID and/or an access control information, such as a CSG.
  • the terminal-specific restriction information may be an information in addition to the subscriber/user identifier e.g. IMSI (International Mobile Subscriber Identity) .
  • This physical access parameter may be on a physical layer, wherein access control information may be on a higher logical layer .
  • the terminal-specific restriction information may allow a Base Station to perform filtering based on the restrictions indicated by the terminal-specific restriction information. Therefore, the terminal-specific restriction information may allow to find cells, which may match the terminal in its actual condition.
  • the terminal specific restriction information may comprise policies, rules or restrictions for each single terminal which may define requirements which may have to be met before the terminal may access a cell.
  • the terminal-specific restriction information or identifier may be single values or lists of a plurality of values.
  • Accessing a cell may mean accessing a corresponding Base Station generating a cell. Some home Base Station may not be accessed by any arbitrary individual terminal. Access to a home Base Station may be reserved for a close subscriber group. For example, the owner of a home Base Station may want to control the traffic which may flow into a network and thus may restrict the access to a closed subscriber group.
  • Having access policies or access requirements may allow to restrict the access to a predefined group of persons or subscribers.
  • a coffee shop may have a closed subscriber group which may be defined as premium customers or customers of the coffee shop.
  • Providing such terminal-specific restriction information may allow to provide to a first Base Station or a macro Base Station "a priori" knowledge about the capability of the terminal, to which Base Station the terminal may be connected. This may allow the macro Base Station to select appropriate home Base Stations for the terminal. In other words, by having "a priori" knowledge about the capabilities or access rights, rights or privileges for a certain terminal, the macro Base Station may decide which information about home cells the macro Base Station may provide to the terminal as a response to providing terminal-specific restriction information.
  • Having the corresponding information may also allow the terminal to decide about cells to which the terminal may connect .
  • a closed subscriber group identifier may be an identifier which may allow differentiating between different closed subscriber groups.
  • Examples for closed subscriber groups may be a group of customers of a franchise company, a group premium customer, a group of gold customers or similar classification of subscribers or customers, employees of a particular company, or staff and/or students at a particular university or school.
  • a Closed Subscriber Group white list may be a list of Closed Subscriber Groups which a terminal may be subscribed to.
  • a dedicated closed subscriber group frequency may be a frequency dedicated to one or more certain closed subscriber groups. In other words, this may mean that there could be a frequency on which substantially only CSG cells exist. Such a frequency may not be indicated in broadcast system information, so the terminal may have reduced possibilities to discover the existence of the CSG cell without scanning or without may having some other information.
  • providing the access parameter may prevent "blind” scanning and longsome searches.
  • a location of the terminal or a GPS location may be the position of the terminal or of the user of a terminal. Having the position of a terminal may allow the macro Base Station to determine whether the terminal may connect to a close home cell near by the terminal. Having knowledge about the location the macro Base Station may also decide not to connect a terminal to a corresponding home cell since the Base Station may detect that the distance between the terminal and the corresponding home cell may be too far in order to provide appropriate Quality of Service (QoS) .
  • QoS Quality of Service
  • Previously located information may be history information, for example when a terminal already may have been connected to a certain home cell, the terminal may store and provide the information that the terminal already successfully may have been connected to the corresponding home cell. Such a history information may indicate to the macro Base Station that access to the corresponding home cell may be possible.
  • Providing the speed of the terminal may allow the macro Base Station to determine the probability of the terminal accessing a home cell. For example if the expected duration of stay due to a speed of the terminal may be lower than the time needed to connect to the home cell the macro Base Station may decide not to provide access information of such a home Base Station or home cell.
  • the macro Base Station may be enhanced with intelligence, such that the macro Base Station may decide about the applicability of connecting to a plurality of home cells.
  • a radio access type capability or frequency band may select of a group of available home cells corresponding cells appropriate for an access type or frequency band of the terminal, for example if the terminal only supports the GSM technology the macro Base Station (BS) may decide not to provide UMTS based home cell access information to the terminal .
  • BS Base Station
  • the BS would send information only about cells which may not have that TAI/LAI. If the terminal may previously have been connected to a particular TAI, it may be applicable to access the previously recorded TAI, so that cells with that/those previously recorded TAI (s) may be sent.
  • the time before next request may be provided in order to give the macro Base Station the possibility to decide whether it may be appropriate to connect the terminal to a corresponding home cell if the situation may be changed after the next request .
  • a home NodeB hardware identifier may be provided in order to prohibit that the terminal may access to a home cell generated by a Base Station having corresponding HNB HW ID.
  • a macro cell context may be a subset of location information.
  • a macro cell context may be the set of macro cells which may be "visible" to the terminal. Based on this, the first BS may estimate where the terminal may be located and may provide second cell information based on this.
  • the received access parameter may be an access parameter, which may allow the terminal a fast and/or substantially impact-less scanning of a corresponding second cell.
  • the received access parameter or the location- specific information may comprise at least one access parameter selected from the group consisting of a physical cell identifier, a centre frequency, a scrambling code, a base station identity code, a closed subscriber group identifier, a closed subscriber group indicator bit, a tracking area identifier, a location area identifier, a routing area identifier and a neighbour cell list.
  • Information about home cells may not be included in any neighbour cell list broadcasted by macro cells due to the possibly high number of home cells deployed within the coverage area of a macro cell.
  • a Base Station or macro Base Station may have a plurality of possibilities of home cells which may be provided to a terminal requesting for joining a home cell.
  • the macro Base Station may need to reduce the number of possibilities of home cells which the macro Base Station may provide to the terminal or which the macro Base Station may decide to connect the terminal to.
  • the macro Base Station may use an x a priori' knowledge about capabilities, restrictions, policies or rules for the terminal to may have a criterion to reduce the number of provided home cells.
  • Identifiers associated with a home cell may be a physical cell identifier, a CSG indicator, a CSG ID, a TAI ID, a LAI ID, a TAI, a LAI or a RAI.
  • a physical cell identifier in an example may be a physical layer cell ID for E-UTRAN or a scrambling code for UTRAN.
  • a CSG indicator may be a one bit field which may specify if a corresponding cell may be accessible only to one or more closed subscriber groups, a CSG indicator may be employed in LTE.
  • a CSG ID may be a unique identifier for a corresponding CSG, which may allow to identify a CSG.
  • a CSG ID may be used in LTE or UMTS.
  • a TAI may be used in LTE and a LAI and/or RAI may be used in UMTS and/or GSM.
  • the physical cell identifier may be an identifier which may rapidly be decoded by a terminal.
  • the physical cell identifier thus, may be decoded, substantially without impacting the performance of any ongoing connection, i.e. an established connection. In particular the quality of a connection may be not degraded by consuming time for decoding a physical cell identifier.
  • Other information such as CSG indicator, CSG ID, LAI, TAI, or RAI may be transmitted within a System Information Block (SIB) , which may require considerable time to decode and read.
  • SIB System Information Block
  • the physical layer information which may be provided as the access parameters from the first base station, may be used to easily identify the transmissions of the second cell and to perform measurements (e.g. of signal strength) for that cell.
  • the centre frequency of the BCCH carrier may be identified and measured.
  • the centre frequency and scrambling code may be identified and measured
  • the centre frequency and physical layer cell ID may be identified and measured.
  • the terminal may either report these measurements to the first base station or use these measurements to determine whether reselection to the CSG cell should occur. Reporting the measurements to the first base station may result in network controlled handover being initiated.
  • Preventing a terminal or an UE (User Equipment) from trying to decode SIB blocks of cells, which cells may not be allowed to access, may help to maintain a connection.
  • Decoding of SIB blocks may also be a waste of battery power and thus, having "a priori" knowledge about home cells which a terminal may connect with a high probability may help to prevent wasting of battery power and may help to extend the working time of a terminal .
  • receiving access parameter of the available second cell meeting the terminal-specific restriction information may comprise receiving an indication that at least one second cell, which may meet the terminal specific restriction information, may exist. Having the information that such information may exist in the macro Base Station may allow requesting the access parameter associated with the at least one second cell from the first Base Station. By asking the first Base Station whether information about a second cell may exist in the Base Station may allow reducing the bandwidth which may be used for a communication between the terminal and the first Base Station. In a case, where the terminal may receives the information that no information about a second cell may exist in the first Base Station, the terminal may prevent sending restriction information or a list of restriction information. Thus, by for example only receiving a single bit or a single flag indicating, that no information may be available in the first base station may prevent sending a complete list of information.
  • the method may further comprise receiving in the terminal from the first Base Station an indication that the first Base Station may have information about an available second cell.
  • the terminal may search for home cells instead of requesting access parameter from the first base station.
  • the terminal may conduct the search when the base station may not indicate support of the home cell table and/or when there may be relatively few home cells present.
  • the first Base Station may be capable of providing information about available second cells may inform the terminal that the first Base Station to which the terminal may be connected may support a home cell table. In other words, receiving the indication that the first Base Station may have information about an available second cell may motivate the terminal to send the terminal specific restriction information to the corresponding first Base Station .
  • the terminal may connect to a legacy Base Station or to an old Base Station which may not support a feature of providing information about an available second cell.
  • the terminal may receive or request from the base station information, whether the corresponding base station may support the feature of providing information about an available second cell. This information may prevent the terminal to send information which may not be answered by the Base Station. Thus, bandwidth and/or power may be saved.
  • the method may further comprise using for providing the terminal specific restriction information at least one channel selected from the group of channels consisting of a Packet Associated Control Channel (PACCH) , a Slow Associated Control Channel (SACCH) and a Fast Associated Control Channel (FACCH) .
  • PACCH Packet Associated Control Channel
  • SACCH Slow Associated Control Channel
  • FACCH Fast Associated Control Channel
  • An administration or management channel may such be provided.
  • a management channel may be established over a wireless or a wire bound link.
  • Receiving in the terminal information about the presence of at least one second cell may allow a user to decide trying to connect to the second cell.
  • a display may be provided for interfacing with a user.
  • a user may trigger a search for accessible second cells by manually triggering such a search.
  • the number of available cells may be provided.
  • a terminal may use channels which may usually be established between the terminal and a corresponding first Base Station. Thus, no new channel may have to be defined or may have to be established in order to exchange information about access parameter of available second cells between the first Base Station and the terminal.
  • the channels may also be used for receiving the access parameter .
  • At least one second cell in the method for providing an access parameter by a first Base Station to a terminal, at least one second cell may be made available to the first Base Station by connecting the at least one second Base Station to the first Base Station and by receiving in the first Base Station access parameter for the at least one available second cell.
  • access parameter may be provided to the first base station by a further terminal, which may connect to the first Base Station and provide access parameter.
  • the access parameter for the at least one available second cell may be inserted in a home cell table or a CSG table and inserting the access parameter for the at least one available second cell in the home cell table may indicate that the second cell be available.
  • the second cell may be connected to the first cell or may be associated with the first cell in order to allow the first cell to administrate the second cell.
  • the first cell may decide which terminal access the second cell.
  • the method may further comprise receiving in the first Base Station access restriction information.
  • Access restriction information may be information used for a filter, e.g. terminal-specific restriction information. Thus, access restriction information may be provided as well as the access parameter.
  • the access parameter for the at least one available second cell may comprise at least one access parameter and/or access control parameter selected from the group of parameter consisting of a CSG indicator, a CSG ID, a dedicated CSG frequency, a location of a second Base Station, a RAT, a frequency band on which the second Base Station can operate, a TAI, a LAI, a GCI, a neighbour cell list and a HNB HW ID.
  • These parameters may be associated with a second cell which cell may be accessed by the terminal with a high probability and for a predefined time.
  • the macro Base Station may detected that the terminal may have stood for a predefined time in the area of a home cell. Thus, the macro Base Station may predict that the terminal with a high probability may stay in future in this area. Thus, a corresponding home cell may be offered to the terminal to connect to.
  • the method may further comprise storing the access parameter in a Home Cell Table or a Closed Subscriber Group table or a CSG table.
  • a Home Cell Table may be a list of substantially all determined available second cell.
  • the Home Cell Table may accelerate accessing parameters of second cells which may be available.
  • the CSG Table in particular may comprise access parameter, i.e. physical access parameter, and access control parameter, i.e. logical access parameter.
  • the Base Station may filter the CSG Table in accordance with the terminal-specific restriction information for possible cell access, which may be provided by a terminal.
  • Tables thus may exist in the terminal, in the second base station and in the first base station.
  • the first base station may use the CSG table in order to match the tables and in order to provide appropriate access parameters for the terminal .
  • a terminal may also conduct a matching of the tables in order to find appropriate access parameter.
  • the appropriate access parameter may be a sub-group or a sub- table of the CSG table.
  • the method may further comprise sending an indication that the first Base Station may have information about an available second cell.
  • the method may comprise sending an indication that the first Base Station may have detected at least one second cell in a predefined distance of the first Base Station, i.e. nearby the first Base Station.
  • the method may further comprise detecting at least one second Base Station in a predefined distance to the Base Station or detecting a second cell nearby the first Base Station
  • the information may be sent on a regular basis.
  • the first Base Station may indicate to the terminal, connected to the first Base Station, or not yet connected to the first Base Station that it may be useful trying to send terminal specific restriction information to the first Base Station, because as an answer access parameter of an available second cell meeting the terminal specific restriction information may be expected.
  • the message may comprise information about the number of available second cells.
  • receiving an information that a particular base station may have an empty CSG table may prevent a terminal to send the terminal-specific information to the Base Station.
  • the method may comprise receiving update information for the at least one access parameter.
  • the amendments may be also made available in the first Base Station, e.g. in a Home Cell Table or in a CSG Table of the first Base Station.
  • the amended information may be provided to the terminal.
  • the method for providing an access parameter by a first Base Station to a terminal may comprise selecting from the stored access parameter, e.g. in a CSG Table, at least one access parameter selected from the group consisting of a Physical Cell Identifier, a centre frequency, a Closed Subscriber Group Identifier, a Closed Subscriber Group indicator Bit, a Tracking Area Identifier, a Location Area Identifier, a Routing Area Identifier, a Neighbour Cell List, a base station identity code and a scrambling code.
  • physical access parameter may be generated from the CSG Table in order to provide the physical parameter to a terminal.
  • the method may further comprise filtering the stored access parameter, in order to gather access parameter of available second cells, which second cells may meet the terminal specific restriction information.
  • Filtering may allow quickly accessing information stored in a home cell table.
  • the access parameter in the method for providing access parameter to a first Base Station by a second Base Station, may comprise at least one access parameter for the second cell selected from the group of access parameter consisting of a CSG ID, a CSG indicator bit, a dedicated CSG frequency, a location of a second Base Station, a RAT, a frequency band on which the second Base Station may operate, a TAI, a LAI, a GCI, a neighbour cell list, and a HNB ID.
  • the method may further comprise providing the access parameter upon at least one of powering up the second Base Station and updating the second Base Station.
  • the second Base Station may try to connect to a higher layer macro Base Station and to provide access parameter to the macro Base Station. Furthermore, after making amendments within the second Base Station, the second Base Station may also try to inform the macro Base Station about these amendments in order to provide update information about the second Base Station to a terminal.
  • the method may further comprise sending an indication whether the Base Station may have information about the second cell to at least one other Base Station and/or sending an indication whether the Base Station is capable to provide an access parameter.
  • Base Stations may use information about the second cell, in particular access parameter in order to update neighbour lists.
  • neighbour lists may be provided to a macro Base Station or to a terminal.
  • Exemplary embodiments of the present invention have been described with reference to a method for indicating to a terminal the presence of an accessible cell, to a method for accessing a second cell by a terminal, to a method for providing an access parameter by a first Base Station to a terminal, to a method for providing an access parameter to a first Base Station by a second Base Station, to a method in a Base Station for signalling the availability of information about an available other cell, to a program element, to a terminal for selecting a cell for the terminal, to a Base Station for providing an access parameter to a terminal, to a Base Station for providing an access parameter to a first Base Station and to a signalling apparatus for signalling the availability of information about an available other cell.
  • Fig. 1 shows a block diagram of a terminal according to an exemplary embodiment of the present invention.
  • Fig. 2 shows a block diagram of a macro Base Station for providing access parameter to a terminal according to an exemplary embodiment of the present invention.
  • Fig. 3 shows a home Base Station for providing access parameter to a macro Base Station according to an exemplary embodiment of the present invention.
  • Fig. 4 shows a signalling apparatus for signalling the availability information about an available other cell according to an exemplary embodiment of the present invention .
  • Fig. 5 shows a message flow diagram for receiving in a terminal access parameter of an available second cell meeting the terminal-specific restriction information according to an exemplary embodiment of the present invention.
  • Fig. 6 shows a Home Cell Table according to an exemplary embodiment of the present invention.
  • Fig. 7 shows a message flow diagram for receiving in a terminal access parameter of an available second cell meeting terminal specific restriction information applicable for different radio access technologies according to an exemplary embodiment of the present invention.
  • Fig. 8 shows a network diagram of a communication network according to an exemplary embodiment of the present invention.
  • Fig. 9 shows a message flow diagram for sending an indicator on availability of access information by a base station to a terminal according to an exemplary embodiment of the present invention.
  • Fig. 10 shows a message flow diagram for sending an indicator on availability of access information by a base station to a terminal and for using a central server according to an exemplary embodiment of the present invention.
  • Fig. 1 shows the terminal 100, the mobile terminal 100, the UE 100 or the MS 100.
  • the terminal 100 comprises the terminal controller device 101 and the cell determining device 102.
  • the terminal controller device 101 is adapted for determining a first cell to which the terminal is connected. Furthermore, the terminal controller device 100 may determine information about a macro cell, in the coverage of which macro cell the terminal is located. The terminal 100 for example uses antenna 103 to connect to a first cell (not shown in Fig. 1) .
  • the cell determining device 102 is adapted for providing terminal-specific restriction information to the first cell or to the first Base Station.
  • the terminal specific restriction information may be stored in a list, or in a memory within the terminal 100.
  • the terminal specific- restriction information comprises information for the terminal 100, which information determines to which cells the terminal 100 is allowed to connect.
  • the terminal specific restriction information may comprise information about the status of the terminal 100, such as a speed of the terminal or a location of the terminal 100.
  • the terminal-specific restriction information may comprise environmental information or status information of the terminal 100 such as speed or location.
  • Connecting to the first Base Station may also comprise only establishing a control channel to the first Base Station.
  • the cell determining device 102 sends the terminal specific restriction information via antenna 103 to the first Base Station and receives as an answer an access parameter, e.g. an physical access parameter or a list of physical access parameter of an available and accessible second cell, which second cell meets the terminal-specific restriction information.
  • the terminal specific-restriction information may be provided as a list of access parameter.
  • the access parameter received by the terminal 100 may be tailored to the terminal 100 and an actual state of the terminal 100.
  • Fig. 2 shows the Base Station 200, the first Base Station 200 or the macro Base Station 200 comprises the controller device 201, the cell generating device 202 and the storage device 203.
  • the controller device 201, the cell generating device 202 and the storage device 203 are connected with each other.
  • the storage device may comprise a data base 203' for storing a Home Cell Table or a CSG Table.
  • the storage device 203 is adapted to store access parameter, i.e physical access parameter and access control parameter, for at least one available second cell.
  • the controller device 201 allows to connect a terminal to the first cell and for receiving in the Base Station terminal specific restriction information for possible cell access for a terminal.
  • controller device 201 allows to administrate home cells or home Base Stations (not shown in Fig. 2) connected to the controller device 201.
  • the controller device 201 selects from the stored access parameter of available second cells, such access parameter belonging to those second cells meeting the terminal specific restriction information.
  • the controller device 201 further allows to transmit the selected access parameter of available second cells to the corresponding terminal 100.
  • the second cell 200 can be connected to the first Base Station.
  • FIG. 3 Another Base Station 300, which may be a standard Base Station adapted or retrofitted to provide access parameter to a first Base Station, is shown in Fig. 3.
  • This other Base Station 300, the second Base Station 300 or the home Base Station 300 comprises a controller device 301, a cell generating device 302 and a connecting device 303.
  • the connecting device is adapted to connect the Base Station 300 to a first Base Station (not shown in Fig. 3) .
  • the Base Station 300 provides, as soon as it is connected with a macro Base Station 200 access parameter for the second cell to the macro Base Station 200.
  • the macro Base Station 200 or the first Base Station 200 may receive automatically triggered or manually triggered information about connected second cells or connected home cells, which then can be administrated by the macro Base Station 200.
  • Fig. 4 shows the signalling apparatus 400 wherein the signalling apparatus may comprise within one single housing the Base Station 401 and a signalling device 402.
  • the signalling device 402 is adapted to determine whether the signalling apparatus is able to provide an indication and/or whether the Base Station has information about an available other cell.
  • an existing legacy Base Station 401 may be retrofitted with a signalling device 402 in order to prevent, that a terminal tries to send terminal-specific information to a legacy Base Station.
  • the signalling device 402 may be used as a shelter to prevent receiving requests, which the bases station 401 may not be able to process.
  • the signalling device may be an add-on device for an existing base station, in order to enable the base station to broadcast indicators, such as indicators showing that the Base Station, i.e. the signalling apparatus, can support providing access parameter.
  • the signalling apparatus may be a base station comprising a signalling device.
  • the Base Station or the Base Station function may be in a common housing with the signalling device.
  • the Base Station 400 may be an enhanced Base Station, which may allow to react to terminal-specific information. This capability may also be signalled by the signalling device 402.
  • Fig. 5 shows the terminal 100 or multimode UE 100, the home Base Station 300 or HNB 300 and the macro Base Station 200, in particular a GERAN Base Station 200 which work as a macro Base Station.
  • the terminal 100, the HNB 300 and the GERAN BSS 200 may be located at places shown as lines in Fing 5.
  • the time is shown by arrow 502.
  • Fig. 5 shows a message sequence chart, a message flow-chart or a message flow diagram.
  • the block 500 in Fig. 5 shows an initial procedure at the HNB 300 power up or upon an update procedure 500, when parameters within HNB 300 may have been amended.
  • step S500 the HNB 300 scans for neighbour cells.
  • the HNB 300 determines neighbours of HNB 300.
  • HNB 300 may generate a Neighbour Cell List.
  • step S501 the HNB 300 connects to the GERAN BSS 200 or the macro BS 200 and automatically triggered or manually triggered starts transferring home cell parameters such as CSG indicator bit, CSG ID, Phy ID, GCI, TAI, LAI and HNB HW ID, location information to the GERAN BSS 200.
  • the information provided in step S501 corresponds to sending or providing of access parameter, i.e. physical access parameter and access control parameter, by a second Base Station 300 to a first Base Station 200.
  • the Base Station 200 or macro Base Station 200 uses the information provided by the second cell or by the second Base Station 300 or by the HNB 300 for updating a Home Cell Table (not shown in Fig.5) .
  • the Home Cell Table or CSG Table may be a list, comprising provided access parameters of available second Base Stations 300. If the Home Cell Table comprises at least one entry corresponding to the HNB 300, the first Base Station 200 knows that a HNB 300 may be available having the parameters registered in the CSG Table. Thus, terminals 100 can be connected by the macro Base Station 200 to a corresponding HNB or CSG cell 300. Therefore, the Home Cell Table shows the HNBs 300 controlling second cells 300 and what kind of parameters the second cells may have.
  • the macro cell deployments could be of the same RAT of the HNBs 200 or of different RAT (Radio Access Technology) .
  • a 3G (UMTS) HNB 300 or a LTE HNB 300 may be deployed in an area covered by a GERAN macro cell 200.
  • An example for using a macro Base Station 200 and a HNB 300 may be to provide high data rates, for example in an indoor area such as in private home, in areas, which area may only be covered by GERAN macro cells.
  • using the inventive concept may allow in parallel to a GERAN macro overlay network comprising at least one macro cell 200, to increase network capacity by providing in parallel to the overlay network a 3G HNB 300 and/or LTE HNB 300 controlling corresponding cells.
  • the macro cell 300 and the 3G HNB 300 or LTE HNB 300 may overlap.
  • a 3G HNB 300 and/or an LTE HNB 300 may need to be capable of scanning the surrounding environment of the HNB 200, in order to detect neighbour cells.
  • Detected neighbour cells may be included in a Neighbour Cell List (NCL) , which list may be administrated by the HNB 200.
  • NCL Neighbour Cell List
  • the NCL once available within HNB 200, can be broadcasted from the home cell 300 to other networks, in order to support mobility from a home cell to another cell, i.e. outbound mobility.
  • a HNB 300 may be able to scan a GERAN operational frequency in order to detect neighbour GERAN cells.
  • the method for inbound mobility is described in block 501 in Fig. 5. As can be seen, since the blocks 500 and 501 are separated, that the process of powering on and updating an HNB 300, in particular a first Base Station 200 are running independently.
  • step S500 as soon as the HNB 300 may be powered up, the HNB 300 may scan the surrounding radio environment and may detect neighbour cells of different RATs, including a macro GERAN cell 200.
  • a macro cell can become any non-CSG cell, i.e. any cell whose system information indicated that it was not a CSG cell. This may be automatically any cell, which is not adapted for becoming a CSG cell, e.g. a GERAN cell.
  • the HNB 300 connects to the found GERAN macro cell 200.
  • the HNB 300 for example connects to the GERAN macro cell 200 via fixed backhaul, i.e. a fixed wire bound backbone connection, or via radio link.
  • the macro cell now knows that a home cell HNB 300 is available.
  • the HNB 300 makes an upload of information relating to the home cell or CSG cell such as physical parameters and CSG ID.
  • the information upload from the HNB 300 to the macro Base Station 200 could be a subset of possible access parameter.
  • Base Station may mean a subsystem which could comprise multiple systems, e.g. Base Transceiver Station (BTS) and/or Base Station Controller (BSC) .
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • a home cell may be a Closed Subscriber Group cell.
  • Access parameter may be information how the HNB 300 may be accessed, in particular how the HNB 300 can be reached, for example by defining an address or a physical ID and who may be allowed to access the home cell 200.
  • Access parameter characterizing a HNB 300 may be a CSG information bit, wherein a value 0 for the CSG indicator bit mean disabled for CSG and a value of 1 would mean enabled for CSG.
  • the CSG indicator bit may show whether the HNB 200 may provide a closed subscriber group identification.
  • the access parameter provided by the HNB 300 comprise CSG ID, Global Cell ID (GCI), TAI, Location Area Identity (LAI), physical ID (e.g .scrambling code for an UTRAN HNB 300) or physical layer cell identity for an E-UTRAN Evolved HNB (EHNB) .
  • access parameters are used by the cell supported by the HNB 200, furthermore the access parameter comprises the physical ID used by the cell supported by the HNB for example for scrambling code for an UTRAN HNB 300 or a physical layer cell identity for E-UTRAN EHNE. Furthermore, the access parameter comprises a HNB hardware ID (HNB HW ID) .
  • HNB HW ID HNB hardware ID
  • the information uploaded to the GERAN BSS 200 may be a sub- set of the access parameter.
  • the HNB 300 should connect to the GERAN BSS 200 and update the values of such access parameters of the access network node. Such an update may be required, when the CSG may suddenly be switched off and when the CSG indicator bit may be changed from 1 to 0.
  • the GERAN BSS 300 stores the information received from the HNB 300 to a table, for example to a HNB cell table 600, home cell table 600 or a CSG Table 600.
  • a table for example to a HNB cell table 600, home cell table 600 or a CSG Table 600.
  • substantially all the home cells 300 or second cells 300, which are operating in the macro GERAN cell, are listed together with their identification details, i.e. with their access parameter.
  • a macro cell 200 may be characterised by overlapping at least a part of a home cell 300.
  • FIG. 6 An example a CSG Table 600 is shown in Fig. 6. Dependent on whether the home cell 300 which provides the access parameters belongs to UTRAN or E-UTRAN, different access parameter are available.
  • a UTRAN home cell 300 may not be provided with a CSG ID. This is shown in Fig. 6 by an ⁇ N/A' (not applicable) value for the CSG ID in line 2.
  • the information stored in line 2 belongs to a predefined HNB 300, which is an UTRAN home cell 300.
  • the CSG Table 600 comprise all the home cells, which the macro cell administrates.
  • a UTRAN home cell 300 is also not be part of a tracking area, which may be used in LTE. But, a UTRAN home cell 300 may be part of a location area hence such UTRAN cells may be provided with a LAI rather than a TAI.
  • An E-UTRAN home cell 300 may have a CSG ID and may not have a LAI.
  • the E-UTRAN home cell 300 may be associated with a TAI.
  • a TAI could be the same for more than one E-UTRAN home cell 300, as shown in Fig. 6.
  • An UTRAN home cell 300 as well as an E-UTRAN home cell 300 will be assigned a physical ID from a limited pool of codes. This means, that more than one home cell might operate on the same Physical ID. Working or using the same Physical ID may have to be avoided as far as possible .
  • each line 601 correspond to access parameter set of available home cells 300 or CSG cells 300, which CSG cells 300 are associated with the macro cell 200 comprising the CSG table 600.
  • the first column 602 of the CSG table 600 a number reflecting the number of the entry is provided.
  • the CSG ID of a home cell associated with the macro cell may be provided. As shown in line 2 of column 603, a CSG ID of N/A indicates an UTRAN home cell 300.
  • Column 604 comprises a PHY ID
  • column 605 comprises a GCI of a corresponding cell
  • column 606 comprises a TAI value, wherein an UTRAN home cell 300 has a TAI value of N/A.
  • the column 607 comprises LAI parameters, wherein a value of N/A in the LAI column 607 may mean that it belongs to an E- UTRAN home cell 300.
  • Column 608 comprises a CSG indicator bit, which can show whether the corresponding home cell 300 is active or not, in Fig. 6, column 608 every entry has a CSG indicator bit set to 1, which means that all four home cells 300 are active.
  • Centre frequency, scrambling code and physical cell ID are the access parameters, all the other parameter e.g. CSG ID 603, GCI 605, TAI 608 LAI 607, CSG Id. Bit 608 or CSG
  • Indicator Bit 608 and HNB HW ID 609 could be access control parameters .
  • step S504 the UE 100 communicates over a data transport channel with the GERAN macro cell 200, which overlays the home cell 300.
  • Overlaying may mean that a footprint of the macro cell may comprise at least a part of a footprint of a home cell.
  • the UE 100 is capable of exchanging control messages on a dedicated control channel.
  • the dedicated control channel may be an inband control channel, for example a Packet Associated Control Channel (PACCH) , a Slow Associated Control Channel (SACCH) and a Fast Associated Control Channel (FACCH) .
  • PACCH Packet Associated Control Channel
  • SACCH Slow Associated Control Channel
  • FACCH Fast Associated Control Channel
  • the UE may use such a control channel for sending a message to the GERAN BSS 200 or to the first Base Station 200, where the UE specifies details about the home cells, which home cells 300 the UE can access.
  • these control channels may be used for communicating or sending details about home cells 300, which home cells 300 the UE 100 can access.
  • the details about the home cells 300 for example also include allowed tracking areas for CSG operation.
  • the terminal specific restriction information or the parameters sent by the UE might be CSG ID, GCI, TAI, LAI, HNB HW ID. These parameter may describe the restriction for the individual terminal 100.
  • step S505 once the GERAN BSS 200 receives the home cell information request from the UE 100, the GERAN BSS 200 will look up the CSG Table 600 stored in the GERAN BS 200 in order to check if the cells specified by the UE are present and/or available in the GERAN macro cell coverage. The GERAN BSS 200 may also check whether cells which the UE may not know about but which could be accessible to the UE (based on the terminal specific restriction information or other parameters sent by the UE) are present and/or available in GERAN macro cell coverage.
  • the GERAN BSS will forward access parameters for such cells such as the CSG indicator bit to the UE 100.
  • the CSG indicator bit highlights whether the home cell 300 is active or not. Providing the UE with information that a cell is not active may prevent scanning an inactive cell and wasting power by doing work which may never can be successful.
  • the Phy ID Physical Identifier
  • the centre frequency of a home cell 300 may be provided to the UE 200.
  • the home cell list or home cell table in the GERAN BSS 200 is relatively small in size, for example smaller than 22 octets, and if any of the home cells 300 specified by the UE 100 is contained in the list, in another exemplary embodiment of the present invention could be that the GERAN BSS 200 replies to the UE 100 with the whole home cell list. This may mean, that when having a small home cell table, no filtering or parsing may be performed by the GERAN BSS 200. However, the terminal 100 may applies such filtering.
  • Providing the whole home cell table may save the GERAN BSS 200 from parsing the CSG list or CSG table and from filtering out the information as requested.
  • the CSG indicator bit and the PHY ID are taken from accessible home cells 300 by the UE 100.
  • the UE 100 can search for such cells 300 at physical layer by scanning the PHY IDs of the home cells 300 entered or provided by the GERAN BSS 300.
  • the terminal receives access parameters, e.g. CSG indicator bit and the PHY ID, of an available and accessible second cell 300 which meet the terminal specific restriction information, which the UE 100 has sent to the GERAN BSS 200 in step S504.
  • the physical ID of home cells 300 may not be available if not provided by the GERAN BSS 200.
  • NCL neighbour cell list
  • Providing the CSG indicator bit and CSG ID may allow preventing to decode the SIBs in the BCCH of home cells 300 in order to understand or explore whether a home cell 300 is accessible. Since no sophisticated decoding must be employed incurring in service interruptions may be prevented.
  • the mobile knows of the existence of a home cell, it does not know without time-consuming decoding of the SIB whether it can access that cell.
  • Fig. 7 shows the message flow diagram of Fig. 5, wherein the method on which the message flow diagram is based is more general than in Fig. 5.
  • Fig. 7 shows a message flow diagram for a method for home cell 300' information distribution within overlapping macro cells 200' for any type, i.e. either of same RAT or different RAT.
  • Steps S700, S701 and S702 correspond to steps S500, S501 and S502, respectively.
  • a 3G/LTE HNB 300' performs a general scan and detection of multi RAT neighbour cells.
  • the general macro BS 200' is shown.
  • step S704 the UE 100, which in step S703 is either in IDLE or in ACTIVE mode, connects to the Macro BS 200' and requests information about the home cells 300' which the UE 100 can access.
  • the request message includes a subset of the parameters CSG ID, GCI, TAI, LAI, HNB HW ID.
  • step S705 the macro BS 200' replies to the UE 100 by providing Physical ID and possibly the CSG Indicator bit for the home cells 300' specified by the UE 100.
  • the centre frequency may also be provided if the centre frequency is not included in the NCL.
  • the Home Cell List 600 in the Macro BS 200' is relatively small in size and if any of the home cells specified by the UE 100 is contained in the list 600, an other exemplary embodiment of the present invention may be that the Macro BS 200' replies to the UE 100 with the whole CSG list 600.
  • the UE 100 can search for the home cells 300' by only looking at their Physical IDs and avoiding decoding their BCCH. This may save UE battery power and reduce the amount of eventual signalling messages generated by erroneous home cell access attempts.
  • the UE 100 in GERAN Active mode may be able to detect accessible home cells 300' and therefore to handover to the accessible home cells 300' by preventing unnecessary service interruptions.
  • a GERAN macro cell 200, 200' to home cell 300, 300' mobility or handover may be possible since a high QoS degradation caused by adoption of current cell reselection techniques can be prevented.
  • a UE 100 receives information about accessible home cells 300, 300' and/or accessible CSG cells while the UE 100 is connected to or located in an overlapping Macro cell 300, 300' .
  • the proposed methods, base stations and/or terminals can be used in networks where home cells 300, 300' are deployed.
  • Fig. 8 shows a network 800 comprising the macro cell 803, the active CSG cells 804 and the passive CSG cell 805.
  • the macro cell overlap the active CSG cell 805 completely and the passive CSG cell 804 partially.
  • the active cell 805 is active, since the active cell is used by terminal 100. Terminal 100 is allowed to use CSG cell 805 since terminal 100 is member of the CSG associated with CSG cell 805.
  • the macro cell 803 is controlled by the macro Base Station 200
  • the passive CSG cell 804 is controlled by the passive Base Station 300a
  • the active cell 805 is controlled by the active Base Station 300b.
  • the macro Base Station 200 sends an indicator in order to show, that macro Base Station has information about CSG cells 804, 805.
  • the macro Base Station 200, the active Base Station 300b and the passive Base Station 300a are connected to different network nodes of the network nodes 802.
  • the network nodes 802 in combination with the network 801 form the backbone for the cellular network 800.
  • the nodes 802 linking the base stations 200, 300a, 300b may comprise further controlling devices such as RNC (Remote Network Controller) , BSC (Base Station Controller) and / or MSC (Mobile Switching Center) .
  • RNC Remote Network Controller
  • BSC Base Station Controller
  • MSC Mobile Switching Center
  • a terminal 100 which receives in step S901 an indicator from the macro Base Station 200, the Base Station controller 200 or the Radio Access Network 200, e.g. the indicator is a periodical broadcast signal or a periodically sent flag. E.g. the indicator can also be sent in a message dedicated to a terminal.
  • Step S902 a message is sent to the macro Base Station 200 comprising terminal- specific restriction information or terminal access information.
  • the macro Base Station 200 compares in step S903 this terminal-specific restriction information with stored information on other cells such as a CSG Table.
  • the macro Base Station 200 sends at least a subset of information on base stations which can and/or which are allowed to be accessed by the terminal to the terminal 100, i.e. access parameters.
  • the information about base stations sent in step S904 may comprise information on base stations with limited access like CSG cells or CSG base stations. This information about accessible base station may be additional information to information which may be sent in a NCL.
  • an extended or limited NCL may be provided, the extended NCL having additional information about cells, which may be allowed to be accessed by terminal 100. Since this may be a subset of all neighbors, the extended NCL may have less entries than a standard NCL.
  • step S905 the terminal 100 starts scanning base stations according to the received information.
  • Fig. 10 shows substantially the steps shown in Fig. 9.
  • Server 10000 may be a central server comprising a data base in a backbone network.
  • Server 10000 is connected to macro Base Station 200.
  • the server 10000 stores the terminal-specific restriction information. Thus, in step S902' it is not the terminal which sends the terminal-specific restriction information.
  • the terminal 100 sends a message to the macro Base Station 200, informing the Base Station 200 that the Base Station 200 can find terminal-specific restriction information of terminal 100 on the server 10000. For example the terminal 100 sends a network address of the server 10000.
  • step S903' the macro Base Station sends a request message to server 10000, requesting terminal-specific restriction information for terminal 10000.
  • step S903' ' the server 10000 provides corresponding terminal-specific restriction information associated with terminal 100.
  • This terminal-specific restriction information or terminal access information can be used in step S903 for providing information on base stations which can be accessed by the terminal 100, in particular providing access parameter.
  • terminal 100 receives the information needed for scanning the corresponding base stations.
  • this may mean that the HNB 300, 300' on power-up and periodically afterwards, detects the broadcast control channel (BCCH) of an overlaying macro cell 200, 200' or of a plurality of overlaying macro cells 200, 200' the HNB 300, 300' is within range of.
  • BCCH broadcast control channel
  • the HNB 300, 300' communicates information about the HNB 300, 300' to the nodes 300, 300' in the network which are associated with these macro cells 200, 200' , e.g. the macro cell controllers 201, or some other node, e.g. in a case where the base station and the node containing the table are not the same entity or if there exist one node storing the table for multiple base stations.
  • the HNB 300, 300' may be connected to a HNB Gateway or a HNB server.
  • This Gateway may be a OAM (Operation and
  • the Gateway may connect to a domain server, which serves not only the Femto BSs 300, 300' but also GSM BSs, UMTS BSs, LTE BSs etc. Therefore, the Gateway is able to exchange information to/from other BSs via the domain server.
  • the domain server is a OAM node and therefore exchange of information via such node is not regulated by the standard.
  • a UE 100 in contact with a macro cell 200, 200' indicates to the controller 201 of the macro cell 200, 200' that it wishes to receive a list of HNBs 300, 300' which the UE 100 may access or which the UE as far as the UE 100 knows access.
  • This indication may be sent in an other than the GSM connected mode.
  • the UE 100 may provide parameters or terminal-specific restriction information to indicate any subset of HNBs 300, 300' which the UE 100 knows that the UE 100 may access, or any subset of HNBs 300, 300' which the UE 100 knows that the UE may not access, e.g. in the form of a blacklist or a whitelist .
  • the UE 100 may also provide the location information of the UE 100.
  • the UE 100 tells a controller 201 which HNBs 300, 300' the UE 100 is allowed to access and/or the UE 100 tells a controller 201 the UE' s own location. E.g. if inbound channelling is to be used.
  • the HNB 300, 300' are stored in a central server or in a HLR (Home Location Register) . This may prevent transmitting parameter from the UE.
  • HLR Home Location Register
  • a UE 100 in RRC_connected mode can be informed that there are accessible Femto Cells 300, 300' in range of the UE 100 and to let the UE 100 know their Phy ID.
  • the UE 100 may send a request to the macro BS 200, 200' with the UE' s location and a list of accessible Femto Cells 300, 300' may be to minimize the signalling effort.
  • the UE 100 may not notify the macro BS 200, 200' about the UE' s location the macro BS 200, 200' would send to the UE all the possible Femto Cells 300, 300' accessible in the macro cell 200, 200' or in the administration area of the macro cell 200, 200' . This might result in a long list of Femto Cells 300, 300 or home cells 300, 300' .
  • Storing of HNB information in a central server may be realized in each HNB informing the macro BS 200, 200' of the existence of the HNB 300, 300' at power up of the HNB 300, 300' . Therefore, the macro BS 200, 200' may contain information on all Femtos or femto cells 300, 300' included in the macro cell 200, 200' .
  • the controller 201 of the macro cell 200, 200' provides a list of identifiers of HNB cells 300, 300' to the UE 100.
  • the controller may also provide other parameters associated with the cells 300, 300' to the UE 100.
  • the list 600 may be filtered based on the parameters or terminal-specific restriction information provided to the macro cell 200, 200' by the UE 100.
  • the macro cell controller 201 may not have the list 600 stored, in which case it relays the request and response to/from the node which stores the list.
  • the provided identifiers can be on physical level to enable a terminal in GERAN connected mode, to detect and measure the cell without degradation of the ongoing connection.
  • GERAN connected mode may be the same as dedicated mode, packet transfer mode, dual transfer mode or RRC connected mode.
  • the list 600 may be filtered based on the location of the UE 100.
  • the NCL is provided in the GERAN active mode.
  • the macro cell 200, 200' may provide information to the UE 100 based on information formerly received by the UE or based on history information. Using of history information may enabled by storing history information in the UE 100.
  • the controller device 201 of a macro Base Station 200, 200' may provide a list of HNB cells which list the UE 100 may use to perform a neighbour cell measurement based on the provided list.
  • the controller device 201 can be a server 201 in the network, a radio network controller 201 or a macro cell.
  • the UE 100 may only perform physical layer measurements on femto cells 300, 300', i.e. the UE 100 may measure only on the phy ID of the provided femto cells 300, 300' . If the UE 100 receives a list indicating one or more HNBs 300, 300' which the UE 100 believes to be accessible, the UE 100 performs appropriate scanning to detect and optionally connect to the HNB 300, 300' .
  • the UE 100 may indicate the presence of accessible HNBs via measurement reports to the macro cell 200, 200' to which macro cell the UE 100 is currently connected. Based on these measurements the macro cell controller 201 may initiate a network-controlled handover, or a network-assisted cell change of the UE towards the HNB.
  • the macro cells 200, 200' may be of the same or different RAT as the HNB cell 300, 300' .
  • Parameters relating to the HNB 300, 300' which are conveyed to the node 300, 300' associated with the macro cell 200, 200' may include RAT or RATs supported, centre frequency, CSG indicator bit indicating whether CSG rules apply to the corresponding cell, CSG ID i.e. the identity of the CSG, Global Cell ID, TAI, LAI /RAI, Physical ID e.g. scrambling code for a UTRAN HNB or physical layer cell identity for E- UTRAN eHNB (evolved HNB) , HNB Hardware ID and/or Location e.g. obtained by GPS receiver.
  • connection between the HNB 300, 300' and the node may be over the air interface, or via a backhaul connection e.g. through the core network.
  • a backhaul connection e.g. through the core network.
  • the backhaul connection might be using the RAN (Radio Access Network)
  • the core network connects base stations with core network nodes e.g. SGSNs (Service GPRS Support Node) / MSCs (Mobile Switching Center) / GGSNs (Gateway GPRS Support Node etc.) or by some other means e.g. an internet protocol-based network .
  • the parameters associated with a macro cell are periodically determined in order to detect new and/or disabled macro cells and whenever any of the above parameters associated with the HNB 300, 300' change.
  • the HNB 300, 300' may be powered on and off many times and the HNB 300, 300' may change its radio parameters, e.g. Phy ID, CSG ID, CSG indicator bit, etc. Therefore, whenever the HNB 300, 300' powers up and there is a change of radio parameters the HNB 300, 300' may inform the macro BS 200, 200' of this change.
  • radio parameters e.g. Phy ID, CSG ID, CSG indicator bit, etc. Therefore, whenever the HNB 300, 300' powers up and there is a change of radio parameters the HNB 300, 300' may inform the macro BS 200, 200' of this change.
  • the received parameters are stored by the node 200, 200' . This may be e.g. using a common database for all cells, or by using one database/table for each RAT (e.g. UTRAN/ LTE) of the HNB 300, 300' .
  • RAT e.g. UTRAN/ LTE
  • the parameters can either be stored on the macro BS 200, 200' or they can be stored on a central server.
  • the UE 100 may communicate with the macro controller 201 using a dedicated control channel.
  • Such in band control channel could be the Packet Associated
  • PACCH Slow Associated Control Channel
  • SACCH Slow Associated Control Channel
  • Parameters sent by the UE 100 may include RAT capabilities i.e. which RAT(s) it is able to access, list of frequency bands on which the UE 100 can operate, list of CSG IDs (those CSG IDs which are in the CSG 'whitelist' for the UE 100, i.e. the CSG ID the UE 100 is authorized to connect to) , a list of not-allowed TAIs, a list of not-allowed LAIs, a location (obtained e.g. by GPS), a speed and a time before next request .
  • RAT capabilities i.e. which RAT(s) it is able to access
  • list of frequency bands on which the UE 100 can operate list of CSG IDs (those CSG IDs which are in the CSG 'whitelist' for the UE 100, i.e. the CSG ID the UE 100 is authorized to connect to)
  • CSG IDs such as a list of not-allowed TAIs
  • a 'NULL' option may be signalled e.g. in the case of LAIs and TAIs, 'NULL' may indicate that the UE 100 has no not-allowed LAIs or TAIs.
  • the node 200, 200' containing the list of HNB cells 300, 300' and the macro controller 201 can be the same node.
  • this node is the GERAN BSS 200, 200' .
  • the BSS shall, at a minimum, send only details of HNBs 300, 300' which use the RAT or RATs that the UE 100 is capable of.
  • a neighbour cell list may only include the HNBs 300, 300' accessible by the UE 100 in that location or close by to the actual location of the UE 100. If a customised NCL reporting is selected the NCL may comprise Phy IDs of the accessible Femtos in that location of the UE 100.
  • the BSS 200, 200' may further filter the list 600 to send only details of those cells 300, 300' which the UE 100 is likely to be able to access based on the parameters provided by the UE 100. I.e. those home cells 300, 300' whose CSG ID is in the UE ' s CSG whitelist and/or whose TAI/LAI are not in the list of not-allowed TAI/LAI, etc.
  • the list 600 provided by the BSS 200, 200' is filtered on the basis of the information provided by the UE 100, i.e. based on the UE location and/or on the CSGs/TAI/LAI accessible by the UE. This may be done in order to avoid that the BSS sends a huge list of all possible Femto cells
  • the BSS may not apply any filtering.
  • the UE 100 knows which Femto cells 300, 300' the UE 100 can access e.g. via the CSG whitelist. Therefore, in order to save processing power at the BSS 200, 200', if the list 600 of available femto cells 300, 300' or HNBs 300, 300' is small i.e. it fits within the 22 octects available in a GERAN control message, the BSS 200, 200' will send the entire list to the UE and the UE will derive the Phy IDs to measure for the CSGs it can access. This filtering within the UE 100 may also prevent the UE 100 to perform measurements on all the entries on the list.
  • the BSS 200, 200' may omit that cell if it is likely to be out of range of the UE 100. In an other example, if based on speed and time before next request, it is likely to remain outside of range of the UE until the next request is received the BSS 200, 200' may also omit that cell. Such a selection, estimation and evaluation may be used if cells of a given RAT are likely to be outside the range of the UE. Then the list can be empty, to avoid the need for the UE to initiate searching for that RAT.
  • HNB cells 300, 300' have identical physical Ids, e.g if the HNB cells 300, 300' are not distinguishable without reading the system information.
  • Such cells may have differing other parameters (e.g. TAI / CSG ID etc.), so that a UE 100 may be able to access one but not the other.
  • the BSS may consider these as a single entry in the table 600 and therefore in lists sent to Ues 100.
  • the BSS may send the parameters for one or other or both depending on their location relative to the UE. More than one home cell 300, 300' could use the same Physical ID. Therefore, a UE 100 provided with the Physical ID of its accessible home cells 300, 300' could still be subject to the risk of attempting to camp on a home cell the UE is not allowed to access.
  • a UE centric way of reducing the risk of attempting to camp on a home cell the UE is not allowed to access is to scan for Physical IDs provided by the macro BS 200, 200' only when matching home cells 300, 300' location information are detected.
  • the UE 100 may start searching for the CSGs identified by the Physical IDs provided by the Macro BS 200, 200' only when the UE 100 records locations corresponding to the location in which any of the accessible CSGs was detected last.
  • Such location information recorded by the UE during previous home cell access may be at least one location information selected from the group of location information consisting of a Macro cell context within which the home cell 300, 300' has last been accessed, a GPS location recorded at last home cell 300, 300' access, a TA recorded at last home cell 300, 300' access and a LA recorded at last home cell 300, 300' access.
  • Any location information recorded at last home cell 300, 300' access that allows the UE 100 to gather knowledge of home cell 300, 300' proximity may be used.
  • the UE 100 in RRC connected cannot perform cell measurements, i.e. cannot decode SIBs. Therefore the macro BSS 200, 200' provides a list of femto cells 300, 300' that are available in the macro cell 200, 200' and the UE checks which Phy ID to scan for according to its location. This may allow providing the UE location to the BSS 200, 200' and may allow the BSS 200, 200' to provide an already filtered list of Femto Cells 300, 300' .
  • the BSS 200, 200' shall indicate to the UE 100 the level of filtering that has been applied to generate the list. For the parameters that could be provided by the UE 100, the BSS 300, 300' shall indicate whether the BSS 300, 300' applied filtering based on that parameter.
  • An indication also may be provided by the BSS 300, 300' if the BSS 300, 300' is including the whole list, e.g. because it is small, and that no filtering was applied.
  • the BSS should provide that parameter associated with each HNB cell 300, 300' .
  • the BSS 200, 200' may reduce the size of the list by omitting that parameter for each cell.
  • a macro cell controller 201 may indicate that at least one CSG cell 300, 300' within coverage area of the macro cell 200, 200' exist, that no CSG cells 300, 300' within the coverage area of the macro cell 200, 200' exist, or that the macro cell controller 201 has no knowledge of CSG cells 300, 300' .
  • a macro cell controller 201 stores a list of CSG IDs associated with e.g. ⁇ frequency, PCI (Physical Cell Identifier) > identities of CSG cells 300, 300' .
  • the physical parameters needed for an LTE cell, including a home LTE cell are frequency and physical layer cell ID, e.g. PCID, PLCID, PCI etc .
  • the existence of such a list is also signalled in system information, as carried in System Information messages or SIBs.
  • a MS 100 or UE 100 is CSG-capable, i.e. that the UE 100 has a subscription to at least one CSGs, then if the BSS 200, 200' indicates that at least one CSGs 300, 300' exists within the coverage area of a macro cell 200, 200', the MS 100 can prompt the user to trigger a manual search.
  • the MS 100 can request that information from the BSS.
  • the MS 100 may provide the MS's 100 CSG whitelist, to allow the BSS 200, 200' to respond only with information about CSG cells 300, 300' which the MS 100 is able to access.
  • Maintenance of the BSS list 600 could be via O&M and/or by automatic updating from MS's measurement reports.
  • a mobile 100 could be requested to report to the BSS 200, 200' the results of a manual search, i.e. for each CSG cell found, its CSG ID, Frequency and PCI.
  • CSG UMTS cells 300, 300' For cases where the mobile 100 is already in a CSG cell 300, 300' on a dedicated frequency, the fact that this is a dedicated CSG frequency may be signalled in the CSG cells system information , so that mobiles in connected mode know that other cells on the same frequency are all CSG cells.
  • CSG UMTS cells 300, 300' a difference to CSG cells using LTE apply.
  • CSG UMTS cells 300, 300' may by default not be listed in neighbour cell lists.

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

Abstract

La présente invention porte sur un procédé pour indiquer à un terminal (100) la présence d'une cellule accessible. Le procédé comprend la détermination d'une première cellule à laquelle le terminal (100) est connecté. La première cellule est commandée par une première station de base (200, 200'). Le procédé comprend en outre la fourniture d'informations de restriction spécifique de terminal pour un accès cellulaire possible à la première station de base (200, 200') et la réception, dans le terminal (100), d'une indication de l'existence d'une seconde cellule disponible satisfaisant les informations de restriction spécifique de terminal.
PCT/EP2008/061051 2008-08-22 2008-08-22 Procédé, terminal et station de base pour sélectionner dans un terminal une cellule pour le terminal WO2010020293A1 (fr)

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