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WO2016082940A1 - Procédé et nœud de réseau pour la prise en charge d'opérations de transfert - Google Patents

Procédé et nœud de réseau pour la prise en charge d'opérations de transfert Download PDF

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Publication number
WO2016082940A1
WO2016082940A1 PCT/EP2015/051383 EP2015051383W WO2016082940A1 WO 2016082940 A1 WO2016082940 A1 WO 2016082940A1 EP 2015051383 W EP2015051383 W EP 2015051383W WO 2016082940 A1 WO2016082940 A1 WO 2016082940A1
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WIPO (PCT)
Prior art keywords
cell
neighbour
base station
handover
relation
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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.)
Ceased
Application number
PCT/EP2015/051383
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English (en)
Inventor
Raghavendra MAHALINGAPPA
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.)
Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Filing date
Publication date
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Publication of WO2016082940A1 publication Critical patent/WO2016082940A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists

Definitions

  • the present invention relates to wireless communications networks, in general, and in particular to supporting handover operations in wireless communications networks.
  • the 3rd-Generation Partnership Project (3GPP) is standardizing Long Term Evolution (LTE) radio access technology.
  • LTE Long Term Evolution
  • ECGI E- UTRAN cell global identification
  • PCI Physical Cell ID
  • UE user equipment
  • PCI Physical Cell Identity
  • PCI values are organised in 168 groups.
  • the cell searching process in UEs is simplified. Therefore, PCI planning is a very important consideration in LTE network planning and design.
  • PCI planning is a very important consideration in LTE network planning and design.
  • the PCI allocation needs to be collision free and confusion free in order to allow successful handovers.
  • Collision free PCI means that two cells that are adjacent to each other do not have same PCI and confusion free PCI means that the cell may not have neighbour with same PCI.
  • Two scenarios leading to PCI collision and PCI confusion are illustrated in Figures 6A and 6B. These scenarios also clearly illustrate the concept of adjacent and neighbour cells.
  • Blacklists are provided to the UE in order to prevent the UE from reselecting specific neighbouring cells and/or to prevent the UE from measuring specific neighbouring cells for the purpose of handover.
  • the black list of PCIs for a cell plays very important role during handover process in LTE network because the UE will not attempt to be handed over to a cell that cannot handle the UE. Instead, another cell is selected as the target cell.
  • the blacklist may also include cells that unexpectedly disconnected UEs or cells that due to geographical configuration of the area where the cells are not good candidates for target cells in handover operations.
  • pico/femto cells are located in a building in such a way that there is one pico/femto cell ona floor and a macro cell outside. If the UE is on floor other than the ground floor it shall not handover to the macro cell, so in order to prevent this unwanted handover (HO) the relation between the pico/femto cell (on the upper floor) and the macro cell is blacklisted.
  • HO unwanted handover
  • micro/pico/femto cells for premium customers and if your UE is not a premium customer then it should not be allowed to HO to these cells and it will be blacklisted.
  • Existing solutions support user (i.e. network operator) intervention required to update the list of PCI black list for a cell in the network if new PCI planning is performed.
  • a black list is delivered to a UE as part of system information in a cell serving the UE, which means that there are individual black lists for individual cells.
  • a method of supporting handover operations in a wireless communications network includes a plurality of cells wherein each cell is assigned one of a set of identifiers.
  • the method is performed by an Automatic Neighbour Relation function in a base station of the wireless communications network and comprises the steps of interrogating a Neighbour Relation Table of a first cell and updating handover blacklist information with the identity assigned to a second cell if a record in the Neighbour Relation Table for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be used for handover.
  • a base station for use in a wireless communications network.
  • the network includes a plurality of cells wherein each cell is assigned one of a set of identifiers.
  • the base station comprises a processor and a memory, wherein said memory contains instructions executable by said processor.
  • Said base station in performing an Automatic Neighbour Relation function is operative to interrogate a Neighbour Relation Table of a first cell and update handover blacklist information with the identifier assigned to a second cell if a record in the Neighbour Relation Table for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be used for handover.
  • a wireless communications network comprising a first plurality of base stations and a second plurality of cells served by said base stations. Each cell is assigned one of a set of identifiers, wherein individual base station comprises a processor and a memory.
  • the memory contains instructions executable by said processor, whereby said base station in performing an Automatic Neighbour Relation function is operative to interrogate a Neighbour Relation Table of a first cell and update handover blacklist information with the identifier assigned to a second cell if a record in the Neighbour Relation Table for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be used for handover.
  • FIG. 1 is a diagram illustrating method of supporting handover operations in one embodiment of the present invention
  • FIG. 2 is a diagram illustrating method of supporting handover operations in alternative embodiment of the present invention
  • FIG. 3 is a diagram illustrating a base station in one embodiment of the present invention
  • FIG. 4 is a diagram illustrating a wireless communications network in one embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a base station in an alternative embodiment of the present invention.
  • FIGS. 6A and 6B illustrate allocations of PCI values leading to PCI collision and PCI confusion
  • FIG. 7 illustrates standard implementation of ANR function.
  • embodiments means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention.
  • the appearance of the phrases “in one embodiment” or “in an embodiment” in various places throughout the specification are not necessarily all referring to the same embodiment.
  • the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.
  • References throughout the specification to LTE cover both technologies: LTE and LTE Advanced.
  • One of the problems with solutions known in the art is that during operation of a network the structure of the network changes; some cells are removed, new cells are added. For example, in an LTE network with macro cells deployed in a field at a later stage micro and pico cells may be added.
  • a base station in an LTE network is known as eNodeB.
  • Standard document 3GPP TS 36.300 V12.3.0 describes an Automatic Neighbour Relation function that resides and operates in an eNodeB.
  • the ANR function manages a Neighbour Relation Table (NRT). In managing the NRT the ANR function finds new neigbouring cells and adds them to the NRT and also removes outdated Neighbour Relation records from the NRT.
  • NRT Neighbour Relation Table
  • the standard provides that a Neighbour Detection Function responsible for detection of new neighbours and adding a record for these new neighbours to the NRT and a Neighbour Removal Function responsible for detection of outdated relations and removal of such outdated relations from the NRT are implementation specific.
  • ANR is illustrated in Figure 7, which is copied from the above identified standard. More details about the elements illustrated in Figure 7 can be found in 3GPP TS 36.300 V12.3.0 and the abbreviations used in the drawing read as follow: O&M - operation and maintenance, NR - neighbour relation, NRT - neighbour relation table, ANR - automatic neighbour relation, RRC - radio resource control, eNB - eNodeB. This means that there is no one way of implementing these functions, but whichever of the known implementations is used it must carry out the operations defined in the standard.
  • a single neighbour relation record (entry) in the NRT for a first cell contains a Target Cell Identity (TCI), which identifies the target cell (i.e. the cell that is the neighbour of the first cell).
  • TCI comprises ECGI (E-UTAN Cell Global Identity) and PCI (Physical Cell Identity).
  • EGI E-UTAN Cell Global Identity
  • PCI Physical Cell Identity
  • CGI Cell Global Identity
  • ECGI and CGI is simply an identifier of a cell of a mobile wireless communications network.
  • UE in idle mode can only read PCI of the cells, which combined with the limited pool of PCI values may lead to PCI collision or confusion if the PCI values are not updated after changes affecting topology of the network.
  • each Neighbour Relation record comprises the following three attributes:
  • the Neighbour cell Relation shall not be used by the eNB for handover reasons; and • No X2: If checked, the Neighbour Relation shall not use an X2 interface in order to initiate procedures towards the eNB parenting the target cell.
  • the network preferably, is a 4 th generation 3GPP Long Term Evolution wireless
  • the network includes a plurality of cells wherein each cell is assigned an ID from a set of identifiers.
  • the identifier assigned to the cell is a Physical Cell ID (PCI).
  • PCI Physical Cell ID
  • ANR Automatic Neighbour Relation
  • the ANR function interrogates 102, 104 a Neighbour Relation Table of a first cell. If a record in the Neighbour Relation Table for a neighbour cell relation with a second cell indicates that said neighbour cell relation shall not be used for handover 108 then the ANR function updates 110 handover blacklist information with the identifier assigned to said second cell. In an alternative embodiment the ANR function updates 110 handover blacklist information with the identifier assigned to the second cell if the record in the NRT for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be removed 106 and that said neighbour cell relation shall not be used for handover 108.
  • the step 106 is illustrated with dashed line in Figure 1. If the Neighbour Relation Table of the cell comprises more than one neighbour relation record the operations of the method are preferably performed for all neighbour relations - operation 112 (branch "No"). In a preferred embodiment the steps of the method are performed for each cell, 120, in a base station (eNodeB in LTE).
  • eNodeB in LTE
  • Figure 2 illustrates a preferred embodiment of the operation of updating, 110, the handover black list.
  • a first frequency used by the first cell is different from a second frequency used by the second cell and a first radio access technology used by the first cell is the same as a second radio access technology used by the second cell (210 and the branch "No" leading to box 212)
  • the update of the handover blacklist information is performed in System Information Block 5 (SIB5) by adding to the handover blacklist the identifier assigned to the second cell 212.
  • SIB5 is used for delivering inter-frequency neighbour lists.
  • the method comprises updating the handover blacklist information by adding the identifier assigned to the second cell 216 in a System Information Block according to the second radio access technology.
  • the method comprises updating the handover blacklist information by adding the identifier assigned to the second cell 216 in a System Information Block according to the second radio access technology.
  • the blacklist information may be updated in SIB6 (if the target cell is a UMTS cell), SIB7 (if the target cell is a GSM cell) or SIB8 (if the target cell is a CDMA2000 cell). If, however, the first frequency used by the first cell is the same as the second frequency used by the second cell and the first radio access technology used by the first cell is the same as the second radio access technology used by the second cell 210 then handover blacklist information in System Information Block 4 is updated with the identifier assigned to the second cell 214 (210 branch "Yes"). In LTE SIB4 is used for delivering intra-frequency neighbour lists.
  • the operation of updating the handover blacklist information comprises checking if the identifier is already included in the blacklist and adding said identifier to the handover blacklist information if said identifier is not included in the current version of the handover blacklist.
  • the advantage of this operation is that it prevents adding multiple entries of the same data to the blacklist.
  • a network operator is going to deploy an LTE network in a city and that city needs 5000 cells.
  • Each of these 5000 cells will have their own PCI, but since there are only 504 physical cell IDs, the PCI values need to be re-used (i.e. same PCI value will be used multiple times for multiple cells).
  • the key point is that two cells that have identical PCI values cannot be geographically close to each other. At the same time, in certain locations operator may not want handover to happen between two specific cells in the network as explained earlier in the background section. It is preferred not to measure the CGI/ECGI of the neighbour cell before making decision whether handover is allowed or not for that neighbour cell because these measurements consume battery. At the same time, as mentioned earlier, UEs in idle mode can't read ECGI/CGI at all. Therefore preventing certain handovers can be achieved by putting the PCIs of the unwanted neighbour cells in the cell's handover blacklist. In this example the LTE network uses two carrier frequencies Fl and F2. Number of cells per frequency and PCI for each cell is illustrated in the tables below.
  • a Neighbour Relation Table for cell A may look as follows:
  • the ANR function interrogates the NRT for cell A it will find that that neighbour cell relation with cells B, C and G shall not be removed and not be used for handover.
  • PCI values for these cells can be derived from the TCI column of the NRT table and these are 2, 3 and 7 in this example. Based on these findings the ANR function updates the blacklist for cell a by adding the three PCI values. Because cells B and C use the same frequency and the same radio access technology (LTE) the ANR updates relevant blacklist information in System Information Block 4 (SIB4) with the PCI values for cells B and C. On the other hand cell G uses different frequency than cell A and in consequence the ANR updates relevant blacklist information in System Information Block 5 (SIB5) with the PCI value for cell G.
  • SIB4 System Information Block 4
  • SIB5 System Information Block 5
  • a clear advantage of employing the Automatic Neighbour Relation function for automatic updating of blacklists for LTE cells in a network is reduction of handover problems being a result of reduction of number of errors in the blacklists and reduction of time needed for updating the blacklists. This also improves Quality of Service and Quality of Experience (less dropped connections during handover). There is no need to measure CGI/ECGI of a cell at the beginning of handover process if the UE can easily determine that handover to said cell is not allowed.
  • the network 400 includes a plurality of cells, 402 - 408, wherein each cell is assigned one of a set of identifiers, preferably PCI value from the 504 PCI values.
  • the base station 300 comprises a processor 302 and a memory 304.
  • the memory 304 contains instructions executable by said processor 302.
  • the memory 304 may comprise one or several types of memory such as read only memory (ROM), random-access memory, cache memory, flash memory devices, optical storage devices, etc.
  • the instructions stored in the memory 304 include program code for executing the method described earlier and may also include one or more telecommunications and/or data communications protocols.
  • the memory 304 may further store program and user data and various parameters and/or other program data for controlling the operation of the base station 300.
  • Said base station 300 (eNodeB in LTE) in performing an Automatic
  • Neighbour Relation function is operative to interrogate a Neighbour Relation Table of a first cell. If a record in the Neighbour Relation Table for a neighbour cell relation with a second cell indicates that said neighbour cell relation shall not be used for handover the base station 300 performing the ANR function is operative to update handover blacklist information with an identifier assigned to said second cell. In an alternative embodiment the base station performing the ANR function updates handover blacklist information with the identifier assigned to the second cell if the record in the NRT for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be removed and that said neighbour cell relation shall not be used for handover.
  • a first frequency used by the first cell is different from a second frequency used by the second cell and a first radio access technology used by the first cell is the same as a second radio access technology used by the second cell (i.e. both cells are LTE cells)
  • the base station 300 is operative to update handover blacklist information in System Information Block 5 with the identifier assigned to the second cell.
  • the base station 300 is operative to update handover blacklist information with the identifier assigned to the second cell in a System Information Block according to the second radio access technology.
  • the blacklist information may be updated in SIB6 (if the target cell is a UMTS cell), SIB7 (if the target cell is a GSM cell) or SIB8 (if the target cell is a
  • the base station 300 updates handover blacklist information in System
  • the base station 300 performs the operations of interrogation and updating handover blacklist for each cell served by the base station. If the Neighbour Relation Table of the cell comprises more than one neighbour relation record the base station, in a preferred embodiment, performs the operations of interrogation and updating for all neighbour relations recorded in the NRT.
  • Figure 3 also illustrates other elements of a base station that are not part of the present invention, but which are standard components of a base station. These elements include an antenna 310 for establishing and maintaining radio
  • the antenna 310 is communicatively connected to a transceiver 308.
  • the antenna 310 and the transceiver allow for establishing a radio interface towards plurality of user equipment.
  • the base station 300 also comprises an interface 306 towards the core network. This interface may be realised using various different network technologies. For example for LTE networks 3GPP standards provides the following interfaces for connecting eNodeB:
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Figure 4 illustrates a wireless communications network 400 in accordance with an embodiment of the present invention.
  • the network 400 comprises a first plurality of base stations 300, 410, 412, 414 and a second plurality of cells 402, 404, 406, 408 served by said base stations 300, 410, 412, 414.
  • Figure 4 shows more than four base stations and more than four cells, however for clarity of the drawing and brevity of the accompanying description not all elements shown in Figure 4 are referenced by numbers and referred to in this description.
  • the base stations (in a preferred embodiment eNodeBs) shown in Figure 4 comprise components and operate in the same way as the base station 300 described earlier.
  • the base station 500 comprises an interrogation module 502 for interrogating a Neighbour Relation Table of a first cell stored in a memory 504.
  • the base station also comprises an update module 506 in communication with the interrogation module 502.
  • the role of the update module 506 is updating handover blacklist information.
  • the update module 506 updates the handover blacklist information with the identifier assigned to a second cell if a record in the Neighbour Relation Table for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be used for handover.
  • the update module 506 updates the handover blacklist information with the identifier assigned to the second cell if the record in the NRT for a neighbour cell relation with said second cell indicates that said neighbour cell relation shall not be removed and that said neighbour cell relation shall not be used for handover.
  • the updating of the handover blacklist information is performed if said ntifier is not included in a current version of the handover blacklist informati
  • the update module 506 updates handover blacklist information in SIB5 with the identifier assigned to the second cell.
  • the update module 506 updates handover blacklist information with the identifier assigned to the second cell in a System Information Block according to the second radio access technology. As discussed earlier in this situation we have different RATs in the neighbouring cells and it doesn't matter if the frequencies are the same or different.
  • the blacklist information may be updated in SIB6 (if the target cell is a UMTS cell), SIB7 (if the target cell is a GSM cell) or SIB8 (if the target cell is a CDMA2000 cell).
  • the handover blacklist information in SIB4 is updated with the identifier assigned to the second cell.
  • the update is performed by the update module 506.
  • the base station 500 performs the operations of interrogation and updating for each cell served by the base station. Similarly, the base station 500 performs the interrogation and updating for each neighbour relation recorded in the Neighbour Relation Table.
  • Figure 5 also illustrates other elements of a base station 500 that are not part of the present invention, but which are standard components of a base station. These elements include an antenna 310 for establishing and maintaining radio
  • the base station 500 also comprises an interface 306 towards the core network. These elements operate in the same way as corresponding elements of the base station 300 illustrated in Figure 3 and described earlier.

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

Abstract

L'invention concerne un procédé de prise en charge d'opérations de transfert dans un réseau de communications sans fil. Le réseau comprend une pluralité de cellules à chacune desquelles est attribué un d'un ensemble d'identifiants. Le procédé est exécuté par une fonction de relation de voisinage automatique dans une station de base du réseau de communications sans fil. Le procédé consiste à : interroger (102, 104) une table de relations de voisinage d'une première cellule; et mettre à jour (110) des informations de liste noire de transfert avec l'identifiant attribué à une seconde cellule si un enregistrement de la table de relations de voisinage concernant une relation de cellule voisine avec ladite seconde cellule indique que ladite relation de cellule voisine ne doit pas être utilisée pour un transfert (108).
PCT/EP2015/051383 2014-11-24 2015-01-23 Procédé et nœud de réseau pour la prise en charge d'opérations de transfert Ceased WO2016082940A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP2014075443 2014-11-24
EPPCT/EP2014/075443 2014-11-24

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WO2016082940A1 true WO2016082940A1 (fr) 2016-06-02

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107493593A (zh) * 2016-06-13 2017-12-19 中国移动通信有限公司研究院 一种小区切换方法、装置、相关设备和系统
CN110169129A (zh) * 2016-11-15 2019-08-23 瑞典爱立信有限公司 处理邻居关系
WO2019241939A1 (fr) 2018-06-20 2019-12-26 Nokia Shanghai Bell Co., Ltd. Améliorations de relation entre voisins automatique pour connectivité double
WO2020202388A1 (fr) * 2019-03-29 2020-10-08 本田技研工業株式会社 Dispositif de commande, dispositif terminal, procédé de commande et programme
EP3874785A4 (fr) * 2018-11-01 2022-08-10 Nokia Technologies Oy Isolement de fausses stations de base dans des systèmes de communication

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WO2014089051A1 (fr) * 2012-12-03 2014-06-12 Interdigital Patent Holdings, Inc. Commande de mobilité de connexion améliorée pour réseaux à petites cellules

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107493593A (zh) * 2016-06-13 2017-12-19 中国移动通信有限公司研究院 一种小区切换方法、装置、相关设备和系统
CN110169129A (zh) * 2016-11-15 2019-08-23 瑞典爱立信有限公司 处理邻居关系
US11140590B2 (en) 2016-11-15 2021-10-05 Telefonaktiebolaget Lm Ericsson (Publ) Handling neighbour relationships
CN110169129B (zh) * 2016-11-15 2021-11-05 瑞典爱立信有限公司 处理邻居关系
EP3811654A4 (fr) * 2018-06-20 2022-01-19 Nokia Technologies OY Améliorations de relation entre voisins automatique pour connectivité double
WO2019241939A1 (fr) 2018-06-20 2019-12-26 Nokia Shanghai Bell Co., Ltd. Améliorations de relation entre voisins automatique pour connectivité double
US11595834B2 (en) 2018-06-20 2023-02-28 Nokia Technologies Oy Automatic neighbor relation enhancements for dual connectivity
CN112292877A (zh) * 2018-06-20 2021-01-29 上海诺基亚贝尔股份有限公司 用于双连接的自动邻居关系增强
EP3874785A4 (fr) * 2018-11-01 2022-08-10 Nokia Technologies Oy Isolement de fausses stations de base dans des systèmes de communication
JPWO2020202388A1 (fr) * 2019-03-29 2020-10-08
WO2020202388A1 (fr) * 2019-03-29 2020-10-08 本田技研工業株式会社 Dispositif de commande, dispositif terminal, procédé de commande et programme
JP7291208B2 (ja) 2019-03-29 2023-06-14 本田技研工業株式会社 制御装置、端末装置、制御方法、及びプログラム
US11785519B2 (en) 2019-03-29 2023-10-10 Honda Motor Co., Ltd. Controller, terminal device, control method, and program for handover connections

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