EP2409520A1 - Procédé et dispositif de traitement de données dans un réseau de communication mobile - Google Patents

Procédé et dispositif de traitement de données dans un réseau de communication mobile

Info

Publication number
EP2409520A1
EP2409520A1 EP09779160A EP09779160A EP2409520A1 EP 2409520 A1 EP2409520 A1 EP 2409520A1 EP 09779160 A EP09779160 A EP 09779160A EP 09779160 A EP09779160 A EP 09779160A EP 2409520 A1 EP2409520 A1 EP 2409520A1
Authority
EP
European Patent Office
Prior art keywords
central node
base station
measurement information
hnb
home
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09779160A
Other languages
German (de)
English (en)
Inventor
Johanna Katariina Pekonen
Antti Anton Toskala
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
Nokia Siemens Networks Oy
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 Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Publication of EP2409520A1 publication Critical patent/EP2409520A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Definitions

  • the invention relates to a method and to a device for data processing in a mobile communication network.
  • the invention relates in particular to the field of mobility management between a macro-cell network and a home base transceiver station (BTS) and in particular to a direction of traffic from the macro cell to said home BTS.
  • BTS home base transceiver station
  • the base transceiver station is also referred to herein as base station or NodeB. It is known to deploy home base stations or femto base stations within a macro cell, wherein said femto base station may be arranged to convey traffic between a mobile terminal and the core network via a gateway, also referred to as femto gateway or home NodeB gateway (HNB- GW) .
  • a significant amount of femto base stations may be deployed within a macro cell and may be associated with one or more HNB-GW.
  • the macro cell can be determined by the radio cell supplied by a BTS according to, e.g., GSM, 3G, LTE specifications.
  • the base station of a macro cell may be con- trolled by a radio network control (RNC) of a UMTS terrestrial radio access network (UTRAN) .
  • RNC radio network control
  • UTRAN UMTS terrestrial radio access network
  • the mobile terminal which can be any cellular device, e.g., phone, is also referred to as user equipment (UE) .
  • UE user equipment
  • a neighbor cell is identified by a UE measurement report with a certain primary scrambling code (PSC) value.
  • PSC primary scrambling code
  • the serving radio system has mapping information between the PSC values and the Cell IDs of the neighbor cells.
  • PSC primary scrambling code
  • the problem to be solved is to overcome the disadvantages stated above and in particular to provide an efficient solution for identifying a home NodeB.
  • said measurement information is provided by at least one base station to the first central node and/or to the second central node.
  • the network comprises in particular a radio network, e.g., a GSM, 3G, UMTS and/or LTE network.
  • a radio network e.g., a GSM, 3G, UMTS and/or LTE network.
  • the measurement information e.g., a (relative and/or absolute) signal strength between a home NodeB gateway and an RNC can be used to identify a target cell (e.g., a home NodeB) in a target radio access network.
  • a target cell e.g., a home NodeB
  • the target cell can be localized and identified with the help of measurement information provided by the home NodeBs and/or the mobile terminal.
  • the at least one base station is a home base station.
  • Such home base station may also be referred to as home NodeB or a femto station (supplying a femto cell) .
  • the first central node and/or the second central node is or is associated with at least one of the following components: - a radio network controller;
  • NodeB in particular an evolved NodeB
  • a gateway associated with at least one home base sta- tion.
  • the radio network controller may be connected to at least one base station supplying a macro cell of the radio network and/or said gateway (HNB-GW) may be connected to at least one home base station.
  • RNC radio network controller
  • HNB-GW gateway
  • the RNC and the HNB-GW appear as controlling entities for supplying at least one base station each, wherein the HNB-GW may supply home base stations (home NodeBs) that are within the coverage area of the base station controlled by the RNC.
  • a base station itself e.g., an eNodeB
  • eNodeB may be responsible, e.g., for radio resource management.
  • an entity could be utilized managing and/or handling handover or at least a portion thereof.
  • central nodes may be deployed and may exchange or convey said measurement information (or different measurement information) between each other.
  • the first central node is a radio network controller and the second central node is a gateway associated with at least one home base station, wherein measurement information provided by the at least one home base station is conveyed to the radio network controller.
  • the RNC may decide which home base station to select via a handover message and convey such selection information to the HNB-GW.
  • Such handover message may comprise (additional) measurement information supplied by a mobile terminal and such additional measurement information of the mobile terminal may be utilized in order to determine which home base station to select as a destination for a handover.
  • the RNC may inform the HNB-GW about the destination home base station to select. This could be done, e.g., by using an identifier of the home NodeB that may previously be conveyed to the RNC with the measurement information of the home NodeBs forwarded by the home NodeB gateway.
  • the first central node and the second central node are connected to a core network.
  • the list of the neighboring cells may be the list of the neighboring cells only or there may be additional measurement information for each base station, which provides a further granularity if dealing with large number of base stations.
  • said measurement information is associated with a cell identification and/or a physical cell identity (PCI) and/or a primary scrambling code (PSC) of at least one base station.
  • PCI physical cell identity
  • PSC primary scrambling code
  • the (home) base station may be identified by its cell ID and/or by its PSC, wherein the measurement information is provided to the first and/or second central node per such cell ID and/or PSC.
  • the measurement information is provided as an ordered information.
  • the measurement information may be provided as an ordered (or sorted) list comprising, e.g., signal strengths of neighboring cells.
  • the measurement information can be provided by the base station, in particular by at least one home base station and/or by the mobile terminal.
  • a handover of a mobile terminal is indicated by the first central node conveying a message to the second central node comprising measurement information provided by the mobile terminal, wherein said measurement information relates to at least one base station, in particular to several base stations, wherein at least one of the several base stations is a home base station.
  • the measurement information from the mobile terminal as well as from the at least one home NodeB can be utilized to determine which home NodeB to select by the HNB- GW.
  • the HNB-GW may maintain a "topology" regarding the measurement information supplied by its home NodeBs, e.g., based on a signal strength information, a relationship between the attached home NodeBs can be determined.
  • the mobile termi- nal conveys its measurement information together with, e.g., a non-unique PSC
  • the measurement information from the mobile terminal can be applied to said topology in order to determine the correct home NodeB the mobile terminal shall be handed over to.
  • This topology approach applies also to the scenario with the RNC being in charge of selecting the suitable home NodeB; in such case, the RNC may maintain the topology and informs the HNB-GW about the chosen home NodeB.
  • the second central node determines the base station to be selected for the handover based on the measurement information provided by the mobile terminal .
  • the handover of the mobile terminal may comprise at least a portion of the following steps:
  • the mobile terminal reports a first measurement information (e.g., comprising a radio characteristic) to a first central node (e.g., a RNC), said first measurement information comprising measurement values of neighboring cells or base stations;
  • a first measurement information e.g., comprising a radio characteristic
  • a first central node e.g., a RNC
  • each base station comprises a receiver that obtains second measurement information from neighboring base stations;
  • the base station provides said second measurement information to a second central node (HNB-GW) ;
  • At least one of the first and second central node transmits first and/or second measurement information to at least one central node (e.g., to the respective other one of the first or second central node) in advance to or during a handover procedure.
  • the base station determining said second measurement information may do so in advance to the actual handover.
  • the second measurement information can be conveyed to the HNB-GW in advance to the actual handover.
  • said second measurements can be determined and processed automatically on a more or less regular basis independent from any handover request. This helps to keep an updated version of said "topology" described above.
  • said measurement informa- tion is conveyed to a third central node.
  • At least one of the first and second central node may transmit first and/or second measurement information to a central node related to the target cell of the handover.
  • the first measurement information from the mobile terminal as well as the second measurement information from the HNB-GW can be supplied to a third central node being differ- ent to the first and the second central nodes.
  • a device comprising a processor unit and/or a hard-wired circuit and/or a logic device that is arranged such that the method as de- scribed herein is executable thereon.
  • a device being associated with a processor unit and/or a hard-wired circuit and/or a logic device that is arranged such that the method as described herein is executable thereon.
  • the device is a communication device, in particular a or being associated with a radio network controller (RNC) .
  • RNC radio network controller
  • the device is a communication device, in particular a or being associated with a home NodeB gateway (HNB-GW) .
  • HNB-GW home NodeB gateway
  • the HNB-GW may receive (via the RNC) a handover request from the mobile terminal (UE) according to which one of the HNB-GW' s cells is identified by a PSC and several neighboring (home) NodeBs as well as their respective signal strength.
  • the HNB-GW may receive measurement information from neighboring or adjacent NodeBs (home NodeBs assigned to the HNB-GW, other home NodeBs or from the NodeB of (at least one) macro cell) . Such information can be used to define and main- tain said topology described above.
  • Fig.l shows a block diagram of a network scenario comprising a macro cell that is connected to a RNC and another macro cell that is connected to another RNC as well as a HNB-GW that is connected to several home NodeBs;
  • Fig.2 shows a central node, in particular a HNB-GW
  • Fig.3 shows steps to be conducted at a central node, in particular a HNB-GW, preferably prior to a handover request received at such central node;
  • Fig.4 shows steps to be conducted at a central node, in particular a HNB-GW, when a handover request is received.
  • the mobile terminal may determine and/or report cell measurements regarding an actual target cell as well as at least one neighbor cell. Based on such neighbor cell measurement results it is possible to determine a home NodeB location within a macro cell's coverage area.
  • the target cell may be identified via a transparent container comprising a PSC and a list of further adjacent or neighboring cells based on the mobile terminal's measurement report.
  • Such list of neighboring cells may comprise identifiers for neighboring cells (e.g., a Cell ID and/or a PSC), e.g., in a particular order (e.g., based on a signal strength determined) or for each cell a cell identifier and the signal strength may be reported by the mobile terminal to the source system.
  • the home NodeB may comprise a receiver to monitor an adjacent cell environment. Based on this monitoring the home NodeB is able to identify its neighboring cells and it may provide information regarding the neighboring cells, e.g., the detected cells in a macro layer and/or their signal strengths, to the network. For example, such information may be conveyed to a femto gateway and/or to an RNC of the macro cell network.
  • the target cell can be identified by comparing the PSC value of the handover request message with the PSC values used in the home NodeB cells and/or by comparing the reported neighboring cells with the neighbor cell information of the home NodeB cells.
  • This approach bears in particular the advantage that it is interoperable with legacy mobile terminals (e.g., UEs that do not provide a neighbor frequency BCH decoding capability) . Furthermore, the approach provides a high reliability for large macro-cells with a huge number of home NodeBs in their coverage area to determine the correct home NodeB even if the same PSC is used by several home NodeBs.
  • legacy mobile terminals e.g., UEs that do not provide a neighbor frequency BCH decoding capability
  • the approach suggested is applicable in a LTE scenario as well, where instead of primary scrambling codes the primary synchronization signals (PSS) and secondary synchronization signals (SSS) are used to separate cells (before BCH decoding) .
  • PSS primary synchronization signals
  • SSS secondary synchronization signals
  • the respective reported measurements are instead of the measurements based on the relative or absolute strength of a common pilot channel (CPICH) in UTRAN, the Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) thus reporting the absolute strength or quality of the reception of the cell specific reference signals.
  • CPICH common pilot channel
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the RSRP can be determined for a cell considered as a linear average of the power contributions (in [W] ) of the resource elements that carry cell-specific reference signals within the considered frequency bandwidth. If a receiver diversity is used by the mobile terminal, the reported value can be substantially equivalent to the linear average of the power values of the diversity branches.
  • the RSRQ can be determined as a ratio
  • N is a number of resource blocks (RBs) of the E-UTRA carrier RSSI measurement bandwidth.
  • the measurements in the numerator and denominator can be made over the same set of resource blocks.
  • Fig.l shows a block diagram of a network scenario comprising a macro cell 101 that is connected to a RNC 103 and a macro cell 102 that is connected to a RNC 104.
  • Each macro cell 101, 102 is supplied by a base station or a NodeB.
  • the macro cell 101 has a PSC of "3".
  • a first group of femto cells or home NodeBs (HNB) 105, 106 and 107 are deployed.
  • the HNBs 105 and 107 each have a PSC of "1" and the HNB 106 has a PSC of "2".
  • the first group of HNBs 105 to 107 is connected to a HNB gateway (HNB-GW) 108.
  • the coverage area of the macro cell 101 also contains a further HNB 109 that is connected to a further HNB-GW (not shown) .
  • the RNCs 103, 104 and the HNB-GW 108 are connected to a core network 110.
  • a UE 111 is connected to the NodeB of the macro cell 101.
  • the UE 111 connected to said macro cell 101 may enter the coverage area of the HNB 105 and a handover from the macro cell 101 to the HNB 105 shall be conducted.
  • a handover from the macro cell 101 to the HNB 105 shall be conducted.
  • the handover needs to be directed to the HNB 105 and not to the HNB 107.
  • the handover decision is made to determine the correct HNB for the UE 111.
  • Measurement information is conveyed to the HNB-GW 108 from all its associated HNBs 105 to 107 or at least from a selection thereof. Such measurement information can be obtained by the HNB on a regular basis or it may be event-triggered.
  • the measurement information may comprise signal strength information, bit error information or signal-to-noise ratio information.
  • the measurement information may be obtained by a HNB from at least one of its neighboring HNBs.
  • the HNB 105 conveys measurement information 112 to the HNB-GW 108, said measurement information comprising signal strength information from neighboring HNBs 106 and 107 evaluated by a receiver of the HNB 105.
  • the neighboring HNBs 106 and 107 may be identified by it PSC.
  • the measurement information 112 may comprise:
  • the HNB 105 determines a signal strength of a base station (here the HNB 106) with a PSC of "2" to amount to "-8" and a signal strength of a base station (here the base station of the macro cell 101) with a PSC of "3" to amount to "+4".
  • the HNB 107 may provide measurement information 113 to the HNB-GW 108 as follows:
  • the HNB 107 determines a signal strength of the HNB 106 with the PSC of "2" to amount to "-9" and a sig- nal strength of the macro cell 101 with the PSC of "3" to amount to "+3".
  • the UE 111 determines a measurement information as follows
  • HNBs may utilize only a limited set of
  • PSCs i.e. the macro cells may be uniquely identified via its PSC, which is not the case for the PSCs used for HNBs within such a macro cell.
  • the handover request may be initiated by the RNC 103 sending a corresponding message 114 to the HNB-GW 108.
  • Such message advantageously comprises measurement information as provided by the UE 111.
  • the handover request may comprise a target ID of the HNB-GW 108, in particular a number to (uni- quely) identify the HNB-GW 108.
  • the handover request may comprise within its transport container a target cell information, i.e. a PSC (in this example of Fig.l, the PSC amounts to "1" as the UE 111 intends to handover to HNB 105), as well as measurement information regarding neighboring cells of the HNB 105, e.g., PSC2 : -6, PSC3 : +4.
  • the HNB-GW 108 is then enabled to determine the target cell, i.e. the destination of the handover, to be HNB 105 based on the message 114 received from the RNC 103 as well as the mea- surement information 112, 113 received from the HNBs 105, 107.
  • the target cell i.e. the destination of the handover
  • the HNB-GW 108 determines the target cell, i.e. the destination of the handover, to be HNB 105 based on the message 114 received from the RNC 103 as well as the mea- surement information 112, 113 received from the HNBs 105, 107.
  • the HNBs shown a signal status between the HNBs
  • the UE 111 reaching the coverage area of HNB 105 may result in measurement information regarding the HNB 106 and the macro cell 101, wherein (assumed that the macro cell 101 has a strong signal around the center of the cell) a signal strength of the macro cell 101 is higher than a signal strength of the HNB 106.
  • the HNB-GW 108 may now determine the HNB 105 to be the correct destination to be assigned to the UE 111, because the HNB 107 would show less signal strength in relation to the macro cell 101 than does the HNB 105.
  • the decision about which HNB to become the destination of the handover may be made at the RNC.
  • the measurement information provided by the HNBs to the HNB-GW may be forwarded to the RNC.
  • the RNC has an overview of the measurement information of the HNBs and is provided by the measurement information from the UE. It may thus decide which HNB to choose and communicate the result to the HNB-GW for processing the handover.
  • a unique identifier for each HNB may advantageously be used for communicating the destination of the handover to the HNB-GW.
  • unique identifier a combination of the PSC and a HNB ID may be used, or a unique ID of the HNB may be used.
  • Such unique identifier may at least partially be conveyed - e.g., together with the measurement information - from the HNB-GW to the RNC.
  • the RNC may be aware of the mapping rela- tionship between HNBs with a PSC and the corresponding HNB-
  • the RNC will be associated with one HNB-GW if all HNBs of a macro cell coverage area are associated with one HNB-GW. Alternatively, the RNC may be aware of PSC values used for HNBs associated with different HNB-GWs.
  • Fig.2 shows a central node, in particular a HNB-GW, e.g., the HNB-GW 108 of Fig.l, comprising a processing unit 201, which may comprise a processor unit and/or a hard-wired circuit and/or a logic unit, at least one interface 202, a memory 203 and a measurement database 204.
  • a processing unit 201 which may comprise a processor unit and/or a hard-wired circuit and/or a logic unit, at least one interface 202, a memory 203 and a measurement database 204.
  • the at least one interface 202 is connected to the processing unit 201, the memory 203 is associated with said processing unit 201 and the measurement database 204 is controlled by the processing unit 201.
  • the measurement database 204 can be used for storing measurement information that can be retrieved and utilized, e.g., for handover purposes, in particular for identification purposes to decide which home NodeB to be used as target cell.
  • Fig.3 shows steps to be conducted at a central node, in particular a HNB-GW, preferably prior to a handover request received at such central node.
  • a step 301 measurement information is received from at least one base station, in particular from at least one home base station, which measurement information is stored in a step 302 in said measurement database.
  • the HNB-GW obtains measurement information from its associated home base stations.
  • the HNB-GW is able to determine a "topology" or distribution of the home base stations within its reach.
  • Fig.4 shows steps to be conducted at a central node, in particular a HNB-GW, when a handover request is received.
  • a handover request is received from a central node.
  • Said handover is one example of an action to be conducted (at least partially) at the central node.
  • measurement information and cell information are re- trieved from the handover request.
  • the handover request contains such information, which may initially be determined by the mobile terminal that is subject to the actual handover.
  • the measurement information retrieved is compared with measurements information stored in the measurement database.
  • the cell is determined that matches the stored measurement information best and the handover is further processed in a step 405.

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

Abstract

L'invention porte, en vue de surmonter ce problème, sur un procédé de traitement de données dans un réseau de communication mobile, dans lequel des informations de mesure sont acheminées d'un premier nœud central à un second nœud central, et dans lequel lesdites informations de mesure sont fournies par au moins une station de base au premier nœud central et/ou au second nœud central. L'invention porte également sur un dispositif correspondant ainsi qu'un système de communication comprenant un tel dispositif.
EP09779160A 2009-03-16 2009-03-16 Procédé et dispositif de traitement de données dans un réseau de communication mobile Withdrawn EP2409520A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2009/053077 WO2010105665A1 (fr) 2009-03-16 2009-03-16 Procédé et dispositif de traitement de données dans un réseau de communication mobile

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EP2409520A1 true EP2409520A1 (fr) 2012-01-25

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Publication number Priority date Publication date Assignee Title
US20120309394A1 (en) * 2010-09-16 2012-12-06 Qualcomm Incorporated Apparatus and methods for hand-in to a femto node
US9137713B2 (en) 2010-09-16 2015-09-15 Qualcomm Incorporated Apparatus and methods of hand-in to a femto node
CN103781135B (zh) * 2012-10-22 2017-08-08 国基电子（上海）有限公司 家用基站之间的切换控制系统及切换控制方法
CN103856949B (zh) * 2012-12-07 2019-04-05 中兴通讯股份有限公司 一种对多个小基站进行小区合并的方法、管理方法和系统

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WO2009086991A1 (fr) * 2008-01-10 2009-07-16 Ip.Access Limited Élément de réseau, unité de communication sans fil et procédé d'utilisation de rapports de mesure

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US7613444B2 (en) 2006-04-28 2009-11-03 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic building of monitored set
EP2060130A4 (fr) * 2006-10-31 2010-03-10 Kineto Wireless Inc Procédé et appareil pour permettre une transmission pour femtocellules
GB2452016A (en) * 2007-06-29 2009-02-25 Motorola Inc Method of handoff in a multi-layer cellular communication network

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WO2009086991A1 (fr) * 2008-01-10 2009-07-16 Ip.Access Limited Élément de réseau, unité de communication sans fil et procédé d'utilisation de rapports de mesure

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