WO2011012160A1 - Identification d'un nœud de réseau par combinaison de premières et secondes informations - Google Patents

Identification d'un nœud de réseau par combinaison de premières et secondes informations Download PDF

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Publication number
WO2011012160A1
WO2011012160A1 PCT/EP2009/059849 EP2009059849W WO2011012160A1 WO 2011012160 A1 WO2011012160 A1 WO 2011012160A1 EP 2009059849 W EP2009059849 W EP 2009059849W WO 2011012160 A1 WO2011012160 A1 WO 2011012160A1
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Prior art keywords
information
network node
network
identifying
cell
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PCT/EP2009/059849
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English (en)
Inventor
Angelo Centonza
Rossella De Benedittis
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Nokia Siemens Networks Oy
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Priority to PCT/EP2009/059849 priority Critical patent/WO2011012160A1/fr
Publication of WO2011012160A1 publication Critical patent/WO2011012160A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to the field of mobile telecommunication networks.
  • the present invention relates to the availability of cell information within a 3G or 4G mobile telecommunication network, which cell information may be important for a handover of a user equipment.
  • the present invention relates to the identification of a network node within the telecommunication network.
  • the network node may be for instance a femto access point de- fining or providing radio access for user equipments within a so called femto cell within the telecommunication network.
  • Femto Access Points which are also called femto base stations, can provide small size femto cells for domestic and enterprise coverage. Femto cells could be deployed with high density within other cells like macro cells, which typically have undergone a network planning.
  • HO Handover
  • UE Equipment
  • an active mode mobility involving femto cells was only supported in outbound directions towards a macro cell, i.e. for an UE moving away from a femto cell towards a macro cell or in general towards a non-femto cell.
  • requirements have been established by which active mode mobility also needs to be supported for a HO between different femto cells and for a HO from a macro cell to a femto cell.
  • the problem of active mode mobility was addressed by the fact that the source cell respectively the source Base Station (BS) could uniquely determine the target cell respectively the target BS on the basis of the results of certain physical layer measurements, which have been carried out by the UE.
  • BS Base Station
  • Such measurement results identifying a reported target BS are for instance the Primary Scrambling Code (PSC) for UMTS or the Pri- mary Cell Identity (PCI) for LTE.
  • PSC Primary Scrambling Code
  • PCI Pri- mary Cell Identity
  • the typical way for the source BS to identify the target BS for a planned HO is that of using physical layer measurements provided by the UE, such as the PSC or PCI of the target BS. Because each cell belonging to the same network operator (i.e. to the same PLMN-id) has as- signed a unique PSC/PCI it is always possible for the serving BS respectively the source BS to know which candidate target cell has been measured by the UE.
  • the FAP provides access only to authorized subscribers, which form a CSG. Thereby, the FAP defines a CSG cell.
  • Hybrid access mode The FAP operates as a CSG cell where at the same time, non-CSG members are allowed to access. This means that the FAP is accessible to all UEs but it still supports a CSG, meaning that UEs accessing the FAP and belonging to the CSG will receive a preferential treatment.
  • the FAP operates as a normal cell, i.e. a non-CSG cell. Access is provided to any subscriber. There is no limitation to any assigned CSG.
  • the femto cell is equivalent to a public cell. It is mentioned that for Long Term Evolution (LTE) networks a FAP is often also referred to as a Home evolved Node B
  • CSG cells will in most of the cases be deployed in an uncoordinated way, because they are typically located by a user. In this respect uncoordinated means that there is no network planning for deploying such cells.
  • Hybrid cells might also be deployed in an uncoordinated way, although operators might want to plan their deployment in case of coverage of public areas such as shopping malls or cinemas where CSG access is granted to the members of staff.
  • Open cell are assumed to be deployed in a coordinated fashion, although nothing prevents operators to deploy such cells also in uncoordinated format with respect to other cells. In case of a high number of femto cells being deployed in the non-CSG PSC/PCI range the scenario of PSC/PCI confusion could be experienced even between macro cells, hybrid femto cells and open femto cells.
  • the known X2 interface be- tween different BSs respectively different eNBs is used to exchange Neighbour information between neighbouring BSs.
  • the corresponding Information Element (IE) "Neighbour Information" included in the so called “X2 SETUP REQUEST” message or the "eNB CONFIGURATION UPDATE” message.
  • IE Information Element
  • Such information is used by the receiving eNB in order (a) to understand if e.g. there is a clash of cell configuration parameters in the neighborhood and a cell re-configuration is needed or (b) to provide means to update or manage a neighbor cell list.
  • the "Neighbor Information" available at a generic eNB and sent to a neighbor eNB via the X2 interface can be constructed via three main ways:
  • the eNB receives "Neighbor Information" from at least one another neighbor eNB via X2. This means that the neighbor of neighbor cells could also be included in the neighbor information list.
  • Such information shall be provided by the UE upon identification of a neighboring BS representing a strong HO candidate.
  • a possible solution would be to request the UE to read and report, besides the PSC/PCI, also the Cell Identification of the measured cell, which might be the target cell for a forthcoming HO. This would require the UE to decode the System Information Blocks (SIB) of the target BS.
  • SIB System Information Blocks
  • the UE will not always be able to decode such system information. This is because such system information necessitates a proper decoding of the Broadcast Control Channel (BCCH) , which requires long measurement gaps leading to possible service interruptions and long HO delays.
  • BCCH Broadcast Control Channel
  • a method for identifying a network node within a telecommunication network in particular for identifying a femto access point.
  • the provided method comprises (a) receiving a first information about the network node, (b) receiving a second information about the network node, and (c) identifying the network node based on a combination of the first information and of the second information.
  • the described network node identification method is based on the idea that by combining different information or different information elements with each other an ambiguity with respect to a network node identification can be reduced at least partially. This may mean that depending on the specific network application the described method may help to completely eliminate an uncertainty about the network node identification. However, even if the ambiguity cannot be eliminated completely, a unique identification of the network node will be possible at least with a much higher probability.
  • the first and/or the second information may be derived from information elements, which may already be used independently from each other in a known telecommunication network for in- stance for operating the telecommunication network.
  • the described combination of different information may provide the advantage, that in order to at least increase the probability of a correct network node identification it may not be necessary to introduce new information elements or new messages, which would increase the signaling overload with the respective telecommunication network.
  • the first infor- mation and/or second information is received from a user equipment.
  • the user equipment UE
  • the user equipment can generate the respective information for instance by measurement of signals, which are transmitted or broadcasted by the network node which is supposed to be identified.
  • the first information and the second information may be received from one and the same UE. However, it would also be possible, that the first information is received from a first UE and the second information is received from a second UE. It would even be possible that the first and/or the second information is/are determined by a combination of information messages which have been received from different UEs.
  • the UE may be any type of communication end device, which is capable of connecting with an arbitrary telecommunication network access point such as a base station (BS) , a relay node and/or a femto access point (FAP) . Thereby, the connection may be established in particular via a wireless radio transmission link.
  • BS base station
  • FAP femto access point
  • the UE may be a cellular mo- bile phone, a Personal Digital Assistant (PDA) , a notebook computer and/or any other movable communication device.
  • PDA Personal Digital Assistant
  • identifying the network node is carried out by a serving base sta- tion, which is currently serving the user equipment.
  • a serving base sta- tion which is currently serving the user equipment.
  • the serving base station (BS) of the UE obtains more precise information about its current network environment. It is mentioned that preferably also the above defined step of receiving the first information and/or the above defined step of receiving the second information may be carried out by the serving BS .
  • the network node is a target base station for a possible handover of the user equipment from the serving base station to the can- didate base station.
  • the mobility of the UE can be supported more precisely than in known telecommunication networks, for which the uncertainty about the identification of possible respectively candidate target BS may be much larger. This holds in particular (a) for cellular telecommunication networks, where there is a high deployment density of (uncoordinated deployed) BSs and/or (b) for UEs which are moving very fast.
  • the network node is a femto access point.
  • FAP femto access point
  • a FAP is often also called home base station, which in case of a Long Term Evolution (LTE) network is a home evolved NodeB (h(e)NB).
  • LTE Long Term Evolution
  • h(e)NB home evolved NodeB
  • the femto cell may also be called a home cell.
  • the FAP is typically located at the premises of a customer of an internet service provider, of a customer of a mobile network operator and/or of a customer of any other telecommunication service provider.
  • the FAP may be a low cost, small and reasonably simple unit that can connect to a Base station Controller (in a Global System for Mobile communications (GSM) network) and/or to a core network (in a LTE network) .
  • GSM Global System for Mobile communications
  • LTE Long Term Evolution
  • the FAP is typically a much cheaper and less powerful device. This may hold in particular for the spatial coverage.
  • the FAP may be designed for a maximal number of UEs, which maximal number is typically between 5 and 20.
  • a macro BS may be designed for serving much more UEs.
  • a macro BS may serve for instance 50, 100 or even more UEs.
  • a further important difference between a FAP serving a femto- cell and a macro BS serving an overlay cell of a cellular telecommunication network can be seen in restricting the ac- cess of UEs.
  • a FAP often provides access to a closed subscriber group (CSG) and/or to predefined UEs only. This may be achieved by a rights management system, which can be implemented in the FAP. With such a rights management system it may be prevented for instance that an unauthorized user can use a private and/or a corporate owned printer, which represents a communication device being assigned to the femtocell of the FAP.
  • a macro BS typically provides an unlimited access for UEs provided that the user of the respective UE has a general contract with the operator of the corresponding mobile telecommunication network or at least with an operator, which itself has a basic agreement with the operator of the macro base station.
  • a FAP can be operated in a so called Open access mode.
  • the first information is the Primary Cell Identity of the network node and/or the second information is the Evolved Absolute Radio Frequency Channel Number of the network node.
  • This embodiment of the invention relies on the possibility of configuring the network node, which is in particular a FAP or H(e)NBS, so to let it operate within a for instance 1.25 MHz frequency slot.
  • the network node which is in particular a FAP or H(e)NBS
  • the network node which is in particular a FAP or H(e)NBS
  • an operator could configure FAPs in order to operate within one of the 1.25 MHz frequency slots.
  • the 1.25 MHz frequency slots may be available by dividing the 5 MHz carrier into three parts, wherein an appropriate frequency gap is used in order to separate different neighboring frequency slots from each other.
  • Evolved Absolute Radio Frequency Channel Number or E-UTRA Ab- solute Radio Frequency Channel Number (EARFCN) of FAP cells will therefore change depending on the 1.25 MHz slot they are chosen to operate in. Specifically, there will be a different EARFCN for each 1.25 MHz slot and yet another EARFCN for the macro cells operating in the whole 5 MHz slot.
  • this embodiment of the invention relies on the assumption that a macro BS and a FAP will store information about all neighbor cells being recorded, i.e. both macro cells and Femto cells.
  • Such neighbor information will include the EARFCN of each neighbor (macro and/or femto) cells.
  • the EARFCN may be made available (a) either via X2 signaling of neighbor information reporting or (b) via an Automated Neighbor Relationship (ANR) function.
  • ANR Automated Neighbor Relationship
  • the described embodiment of the invention may consist of letting the UE report to its serving BS, which in case of a Handover (HO) represents the source cell, a pair of measurement information concerning the candidate target cell of a HO.
  • This pair of measurement information comprises (a) the EARFCN of the candidate target cell and (b) the Pri- mary Cell Identity (PCI) of the candidate target cell.
  • PCI Pri- mary Cell Identity
  • the database where the mapping between the PCI and the EARFCN is performed does not necessarily have to be in the macro BS.
  • the mapping could be done for example in a centralized network node such as the Home Management System used for Femto provisioning and Operating And Maintenance (OAM) procedures.
  • OAM Operating And Maintenance
  • the serving BS in turn would enquiry the central database to understand the identity of the target femto cell.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the carrier frequency in the uplink and downlink may be designated by the mentioned EARFCN in the range between 0 and 65535.
  • the channel raster may be 100 kHz for all bands, which means that the carrier center frequency must be an integer multiple of 100 kHz.
  • the relation between EARFCN and the carrier frequency in MHz for the downlink/uplink is given by an equation and associated table of frequency bands .
  • the method further comprises receiving a neighbor information from the network node, the neighbor information comprising an information element being indicative for the current access mode of the network node.
  • identifying the network node further takes into account the current access mode of the network node.
  • This extra information may be additionally included in a modified IE, which is based on the known IE "Neighbor Information", which in known LTE telecommunication networks is ex- changed between different neighboring network nodes.
  • a confusion with respect to a HO target identification due to the fact that neighbor cells reported via the IE "Neighbor Information" and/or via an Automated Neighbor Relation Function (ANR) might use the same PCI
  • ANR Automated Neighbor Relation Function
  • the serving BS may be able to uniquely identify the correct HO target network node.
  • the serving BS might not be able to uniquely identify the correct HO target network node even if the serving BS has included such target cell within its neighbors for instance as a consequence of Neighbor Information reporting or as a consequence of ANR.
  • the IE "Neighbor Information" is passed via X2 to a neighbor network node it can be useful for the receiving network node respectively the currently serving BS to understand if the reported neighbor cells are closed femto cells, hybrid femto cells, open femto cells or pure macro cells .
  • a macro cell reconfigures itself due to e.g. PCI clashes which might occur with a FAP or a femto cell deployment being accomplished in an uncoordinated manner. This may mean that it can be guaranteed for a telecommunication network operator that its macro cells will not be affected by uncoordinated cell deployments.
  • the method further comprises obtaining the first information and/or the second information by physical layer measurements.
  • the physical layer measurements may be carried out in particular by a UE.
  • Such measurements accomplished by the UE and collected purely at the physical layer of the known Open System Interconnection (OSI) model may provide the advantage that such measurements are not as harmful for the performance of the UE as for instance a decoding of a Broadcast Control Channel (BCCH) , which is not carried out exclusively at the physical OSI layer .
  • OSI Open System Interconnection
  • the OSI model is an abstract description for layered communications and computer network protocol design. In its most basic form, the OSI model divides network archi- tecture into seven layers which, from top to bottom, are the Application, the Presentation, the Session, the Transport, the Network, the Data-Link and the Physical Layer. In this respect a layer is a collection of conceptually similar functions that provide services to the layer above it and re- ceives service from the layer below it. On each layer an instance provides services to the instances at the layer above and requests service from the layer below.
  • the first information and the second information are selected from the group comprising (a) the Primary Scrambling Code of the Primary Common Pilot Channel of the network node, (b) the
  • identifying the network node a combination of at least two information of the following codes provided by the network node, which is supposed to be uniquely identified, are used: (a) Primary Scrambling Code (PSC) of the Primary Common Pilot Channel (P-CPICH) , (b) Spreading Code (SprC) of the Secondary Common Pilot Channel (S-CPICH) and (c) Scrambling Code (ScrC) of the S-CPICH.
  • PSC Primary Scrambling Code
  • S-CPICH Primary Common Pilot Channel
  • ScrC Scrambling Code
  • a new physical layer measurement shall be defined according to which the UE shall measure and report, besides the target cell PSC also its S-CPICH codes (SprC and ScrC) .
  • the source BS shall be able to univocally identify the target BS to which the UE could be handed over. It is mentioned that the identification procedure described with this embodiment could be achieved either via information about neighbor FAPs stored in the serving BS and/or via information about all the FAPs in the particular neighborhood stored in a centralized database that is queried by the source BS at least at the time a HO is requested or scheduled.
  • the first information is the Primary Cell Identity of the network node and the second information the spectral allocation of the center frequency of the network node.
  • the information used in this embodiment of the invention are in particular applicable for LTE telecommunication networks.
  • a new physical layer measurement shall be defined according to which the UE shall measure and report, besides the PSC of the network node (i.e. the target access point or the target cell) also its center frequency.
  • This new physical layer measurement may be called "bandwidth slot" measurement.
  • such a down-selection could be achieved either via information about neighbor FAPs stored in the serving BS respectively the serving eNB or via information about all the FAPs / femto cells in that particu- lar neighborhood stored in a centralized database that is queried by the source BS at a HO time.
  • a network element for identifying a network node within a telecommunication network, in particular for identifying a femto access point.
  • the described network element comprises a receiving unit for receiving a first information about the network node and for receiving a second information about the network node. Further, the described network element com- prises a processing unit for identifying the network node based on a combination of the first information and of the second information.
  • the described network element is based on the idea that by combining different information or different information elements with each other an ambiguity with respect to a network node identification can be at least reduced.
  • the first and the second information are independent from each other such that the second information cannot be derived from the first information and vice versa.
  • the network element may also be a network node of the telecommunication network.
  • the two network nodes may be for instance neighboring BSs, which may be involved in a HO of a UE.
  • the network element respectively the network node may be a serving BS, which for a HO represents the source BS.
  • the network element, which is to be identified is the target BS for the HO.
  • the telecommunication network may be any cellular network such as for instance a 3G mobile telecommunication network or a 4G respectively a LTE mobile telecommunication network.
  • the described network element may be any access point of the telecommunication network.
  • the described network element may be a BS or an eNB, a relay node or a FAP.
  • the network element may be any central or decentral network entity, which is capable of performing the described steps .
  • the identifiable network node may be any access point of the telecommunication network such as for instance a BS or a eNB or a relay node.
  • the FAP may be operated in different access modes such as (a) a Closed access mode allowing access only for a Closed Subscriber Group (CSG) , (b) a Hybrid access mode allowing access both to members of a CSG and to non-CSG members or (c) an Open access mode, which means that the FAP operates as a normal cell without any access restriction .
  • a user equipment for identifying a network node within a telecommunication network, in particular for identifying a femto access point.
  • the described user equipment comprises a transmitting unit for transmitting a first information about the network node to a network element of the telecommunication network and for transmitting a second information about the network node to the network element.
  • the first information and the second information are suitable, when be- ing combined with each other, for identifying the network node .
  • the described user equipment is based on the idea that by providing different information about the identifiable network node to a network element of the telecommunication network, the network element can be able to identify the network node based on a proper combination of the two information.
  • the two information i.e. the first informa- tion and the second information
  • the two information are independent from each other. This means that the second information cannot be derived from the first information and vice versa.
  • an ambi- guity with respect to a network node identification can be at least reduced.
  • the first information and/or the second information may be obtained by appropriate measurement procedures carried out by the UE itself or by any other measurement device, which is directly or indirectly connected to the UE. As has been already described above in detail, depending on the type of telecommunication network, different measurement procedures may be appropriate for obtaining information being valuable for a reliable network node identification.
  • the UE may be any type of communication end device, which is capable of connecting with an arbitrary telecommunication network access point such as a base station (BS) , a relay node and/or a femto access point (FAP) . Thereby, the connection may be established in particular via a wireless radio transmission link.
  • BS base station
  • FAP femto access point
  • the UE may be a cellular mobile phone, a Personal Digital Assistant (PDA) , a notebook computer and/or any other movable communication device.
  • PDA Personal Digital Assistant
  • a program element for identifying a network node within a telecommunication network, in particular for identifying a femto access point.
  • the program element when being executed by a data processor, is adapted for controlling any embodiment of the above described network node identification method.
  • the program element may be implemented as a computer readable instruction code in any suitable programming language, such as, for example, JAVA, C++, and may be stored on a computer- readable medium (removable disk, volatile or non-volatile memory, embedded memory/processor, etc.).
  • the instruction code is operable to program a computer or any other programmable device to carry out the intended functions.
  • the program element may be available from a network, such as the World Wide Web, from which it may be downloaded.
  • the invention may be realized by means of a computer program respectively software. However, the invention may also be realized by means of one or more specific electronic circuits respectively hardware. Furthermore, the invention may also be realized in a hybrid form, i.e. in a combination of software modules and hardware modules.
  • a computer-readable medium on which there is stored a computer program for identifying a network node within a telecommunication network, in particular for identifying a femto access point.
  • the computer program when being executed by a data processor, is adapted for controlling any embodiment of the above described network node identification method.
  • the computer-readable medium may be readable by a computer or a processor.
  • the computer-readable medium may be, for example but not limited to, an electric, magnetic, optical, infrared or semiconductor system, device or transmission medium.
  • the computer-readable medium may include at least one of the following media: a computer-distributable medium, a program storage medium, a record medium, a computer-readable memory, a random access memory, an erasable programmable read-only memory, a computer-readable software distribution package, a computer-readable signal, a computer-readable telecommunications signal, computer-readable printed matter, and a computer-readable compressed software package. It has to be noted that embodiments of the invention have been described with reference to different subject matters.
  • Figure 1 shows a Neighbor Information exchange via an X2 interface, wherein the Neighbor Information comprises an information element being indicative for a current access mode of an access point.
  • Figure 2 shows physical layer measurements and a reporting of the corresponding measurement results for an identification of a femto access point in a 3G telecommunication network.
  • Figure 3 shows physical layer measurements and a reporting of the corresponding measurement results for an identification of a femto access point in a LTE telecommunication network.
  • Figure 1 shows a Neighbor Information exchange within a telecommunication network 100 via an X2 interface, wherein the Neighbor Information comprises an information element being indicative for a current access mode of an access point.
  • the telecommunication network 100 comprises a first macro cell
  • the macro cells 130 and 140 are each defined by a non depicted macro base station.
  • the described telecommunication network 100 comprises a femto cell 125, which is dafined by a non depicted femto access point (FAP) .
  • the femto cell 125 is spatially lo- cated within second macro cell 120.
  • the various access points of the telecommunication network 100 i.e. the macro base stations and the FAP exchange neighbor information.
  • the X2 interface in between two neighboring base stations (BS) is used to exchange the Neighbor Information via the X2 SETUP REQUEST or eNB CONFIGURATION UPDATE messages.
  • the exchanged Neighbor Information is used by the respective re- ceiving access point in order to understand if e.g. there is a clash of cell configuration parameters in the neighborhood such that a cell re-configuration is needed or to provide means to update/manage the neighbor cell list.
  • the Neighbor Information IE which is currently defined in the TS 36.423, is extended by including an information about the access type of reported access point. Further, the ex- tended Neighbor Information IE includes also information about the Evolved Cell Global Identity (ECGI), the Primary Cell Identity (PCI) of the reported cell and the Evolved Absolute Radio Frequency Channel Number (EARFCN) . Thereby, the PCI can help to understand if a cell, which is defined by the reported access point, is closed (PCI in CSG range) or hybrid (PCI in a hybrid CSG range) .
  • ECGI Evolved Cell Global Identity
  • PCI Primary Cell Identity
  • the respective PCI range split may be optionally deployed in an operator' s network, hence one could face a scenario where the PCI split range for hybrid access mode is not available or where the PCI split range for CSG access mode is not available or where PCI split ranges are not available.
  • the Neighbor Information IE By adding the information about the access mode (see last line of the table) in the Neighbor Information IE the report- ing of the access mode for each cell in the Neighbor Information list is possible.
  • macro BSs respectively macro eNBs receiving the Neighbor Information IE will be able to understand whether the cell is closed, open or hy- brid.
  • the inclusion of the access mode information in the Neighbor Information IE allows reporting of the access mode for each cell in the Neighbor Information list.
  • the respective BS Upon receiving this extra parameter the respective BS will be able to understand whether the cell is closed, open or hybrid. This is in particular advantageous if the receiving BS is a macro BS and the reported access point is a FAP.
  • macro BS might decide not to reconfigure him- self in case of a PCI clash with uncoordinated deployed cells such as CSGs or hybrid. Further, thanks to the access mode information in the neighbor information, macro BSs might decide not to establish X2 connection with closed cells or not to include them in their neighbor cell list.
  • the described reporting of access mode information may also be very useful for the mobility control of a moving UE whereby a handover (HO) may be advantageous in order to provide for a reliable radio connection between the telecommunication network and the UE.
  • a handover HO
  • the serving access point respectively the source access point might be able to uniquely identify the candidate target cell only by taking into account the current access mode of the corre- sponding candidate access point in addition to a CGI or ECGI, a reported PCI and a reported EARFCN (see Neighbor information table 150 depicted in Fig. 1), which are typically reported by the UE.
  • the described modified Neighbor Information IE which also comprises the candidate access mode of the respective candidate target access point, may improve (a) self organization functions of a LTE telecommunication network and (b) the mobility of UEs to femto cells.
  • the improvement of the LTE self organization may be realized by informing the macro eNBs about the access mode of the neighbor cells.
  • Such access mode could be indicative of whether the cells have been deployed in a coordinated or an uncoordinated manner. For example, if closed and hybrid cells have been deployed in uncoordinated manner and the macro eNB receives some of these cells within its neighbor information, it will know not to reconfigure itself in case of cell configuration parameters clashes. The implementation effort of this solution is only in adding the access mode parameter to the list of parameters reported in the Neighbor Information IE.
  • the mobility of a UE towards a femto cell may be im- proved by providing more means to identify the HO candidate target FAP, such means consisting of the EARFCN of the target cell.
  • the configuration of femto cells to operate in a 1.25 MHz slot is already possible and can be currently implemented.
  • the extra implementation effort would only consist (a) in the UE reporting the EARFCN of the HO target cell respectively the HO target FAP to the serving cell respectively the serving BS and (b) in the UE reporting the EARFCN within its ANR measurements report.
  • a unique identification of a FAP rep- resenting a candidate target access point for is carried out via UE measurements, which are carried out exclusively on the physical layer.
  • Figure 2 shows physical layer measurements and a reporting of the corresponding measurement results for an identification of a 3G FAP 260.
  • the described measurement and reporting scenario is carried out with (a) the FAP 260 and a UE 270 and (b) the UE 270 and a BS or eNB 210, which is currently serving the UE 270.
  • the FAP 260 broadcasts, besides the Primary Common Pilot Channel (P-CPICH), also the Secondary Common Pilot Channel (S-CPICH) . While the P-CPICH is always transmitted, the S- CPICH is optional for the 3G FAP 260.
  • P-CPICH Primary Common Pilot Channel
  • S-CPICH Secondary Common Pilot Channel
  • the S-CPICH is characterized (a) by a Spreading Code (SprC) , freely selected out of 256 values (i.e. 8 bits), and (b) by a Scrambling Code (ScrC) , also freely selected of 15 values (i.e. 3 bits) .
  • SprC Spreading Code
  • ScrC Scrambling Code
  • each femto cell will appear dif- ferent to a UE at physical layer. So, for example, if one assumes that 32 PSCs are reserved for the femto cell, it should be possible to characterize up to 2 16 femto cells using different physical layer (layer one) parameters (i.e. different PSCs and different S-CPICH codes) . This can be achieved if the Femto cell selected PSC is coordinated with the ScrC and SprC of the S-CPICH being selected by Femto cell.
  • layer one physical layer one
  • a 3G cell identity is composed of 16 bits, where the first 12 bits are usually common and coded as the controlling Radio Network Controlling Identity. This means that the figures in the example above would be sufficient to discriminate each Femto Cell within the same operator network.
  • a new layer one measurement (named here "S-CPICH codes") shall be defined, according which the UE 270 shall measure and report, besides the PSC of the target FAP 260 also its S-CPICH codes (SprC and ScrC) . From such reported measurements, the source BS 210 shall be able to univocally identify the target FAP 260 to which the UE 270 could be handed over.
  • Such identification could be achieved either via information about neighbor FAPs stored in the serving BS 210, or via informa- tion about all the femto cells in that particular neighborhood stored in a centralized database that is queried by the serving BS at a HO time.
  • the UE 370 approaches the pos- sible candidate target FAP 260 (see step 0: "UE in mobility towards femto cell”) .
  • the 3G FAP 260 broadcasts its PCI, P-CPICH and S-CPICH.
  • the UE 270 measures from the FAP 260 (a) the PCI, (b) the SprC of the S-CPICH and (c) the ScrC of the S-CPICH.
  • the UE 270 reports the respective measurement results to its serving BS 210.
  • the serving BS deduces the identity of the candidate target FAP 260 from the PCI and the two S-CPICH codes.
  • Figure 3 shows physical layer measurements and a reporting of the corresponding measurement results for an identification of a LTE FAP 360.
  • a UE 370 and a eNB 310 currently serving the UE are involved.
  • the PCI is the only physical layer identification parameter of the LTE FAP 360. Any other physical layer channel configuration parameter can be tracked back to the PCI used by the LTE FAP 360. Therefore, in the case of LTE it is not possible to deduce extra information about the candidate target cell respectively the candidate target LTE FAP 360 from its physical layer channel configuration.
  • the solution proposed in this case is that of configuring femto cells in a way that they only use a quarter of the allocated 5MHz spectrum.
  • the cell centre frequency may be preferably in the middle of the 1.25 MHz frequency s- lot .
  • bandwidth slot a new layer one measurement (named here "bandwidth slot") shall be defined, according which the UE 370 shall measure and report, besides the candidate target cell (i.e. the LTE FAP 360) PCI, also its centre frequency.
  • the candidate target cell i.e. the LTE FAP 360
  • PCI also its centre frequency.
  • the UE 370 reported the E-ARFCN of the target FAP 360 to the serving eNB 310 such information could be used by the eNB 310 to down select the cells that would most likely be the right candidates for acting as a target access point.
  • the identification of the LTE FAP 360, which is approached by the UE 370 comprises four steps.
  • a first step 1 the LTE FAP 360 broadcasts its PCI and its E- ARFCN.
  • a second step 2 the UE 370 measures from the LTE FAP 360 (a) the PCI and (b) the E-ARFCN.
  • a third step 3 the UE 370 reports the respective measurement results to its serving eNB 310.
  • the serving eNB 310 down- selects the search for the identity of the candidate target FAP 360 from the PCI and the E-ARFCN values. Thereby, the probability for finding a unique identification can be increased significantly.

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

Abstract

L'invention porte sur un procédé d'identification d'un nœud de réseau (260) dans un réseau de télécommunication, en particulier pour identifier un point d'accès femto (260). Le procédé décrit comprend (a) la réception de premières informations concernant le nœud de réseau (260), (b) la réception de secondes informations concernant le nœud de réseau (260), et (c) l'identification du nœud de réseau (260) sur la base d'une combinaison des premières informations et des secondes informations. L'invention porte en outre sur un élément de réseau (210) et un équipement utilisateur (270) qui, en liaison l'un avec l'autre, sont conçus pour mettre en œuvre le procédé d'identification de nœud de réseau décrit.
PCT/EP2009/059849 2009-07-30 2009-07-30 Identification d'un nœud de réseau par combinaison de premières et secondes informations WO2011012160A1 (fr)

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WO2014040851A1 (fr) * 2012-09-12 2014-03-20 Ip.Access Limited Éléments de réseau, système de communication cellulaire et procédés associés
WO2022171099A1 (fr) * 2021-02-09 2022-08-18 展讯半导体(南京)有限公司 Procédé et appareil de gestion de mobilité d'équipement utilisateur, et support de stockage lisible par ordinateur
CN116600384A (zh) * 2023-07-17 2023-08-15 广州斯沃德科技有限公司 一种多基站定位方法、装置、存储介质以及系统

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WO2014040851A1 (fr) * 2012-09-12 2014-03-20 Ip.Access Limited Éléments de réseau, système de communication cellulaire et procédés associés
WO2022171099A1 (fr) * 2021-02-09 2022-08-18 展讯半导体(南京)有限公司 Procédé et appareil de gestion de mobilité d'équipement utilisateur, et support de stockage lisible par ordinateur
CN116600384A (zh) * 2023-07-17 2023-08-15 广州斯沃德科技有限公司 一种多基站定位方法、装置、存储介质以及系统
CN116600384B (zh) * 2023-07-17 2023-12-19 广州斯沃德科技有限公司 一种多基站定位方法、装置、存储介质以及系统

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