WO2005029902A1 - Procede et systeme de telecommunications pour la negociation de la precision de positionnement entre un client de service de localisation et un equipement utilisateur d'un abonne - Google Patents

Procede et systeme de telecommunications pour la negociation de la precision de positionnement entre un client de service de localisation et un equipement utilisateur d'un abonne Download PDF

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Publication number
WO2005029902A1
WO2005029902A1 PCT/IT2003/000515 IT0300515W WO2005029902A1 WO 2005029902 A1 WO2005029902 A1 WO 2005029902A1 IT 0300515 W IT0300515 W IT 0300515W WO 2005029902 A1 WO2005029902 A1 WO 2005029902A1
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WIPO (PCT)
Prior art keywords
location
positioning accuracy
accuracy level
subscriber
service
Prior art date
Application number
PCT/IT2003/000515
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English (en)
Inventor
Alessandro Lala
Enrico De Luca
Maurizio Iovieno
Original Assignee
Telefonaktiebolaget L M Ericsson_(Publ)
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 Telefonaktiebolaget L M Ericsson_(Publ) filed Critical Telefonaktiebolaget L M Ericsson_(Publ)
Priority to AU2003264875A priority Critical patent/AU2003264875A1/en
Priority to PCT/IT2003/000515 priority patent/WO2005029902A1/fr
Publication of WO2005029902A1 publication Critical patent/WO2005029902A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/16—Mobility data transfer selectively restricting mobility data tracking

Definitions

  • the present invention relates to a method and a telecommunications system for the negotiation of positioning accuracy between a Location Service (LCS) client and a target user equipment (UE) of a subscriber, particularly suited for a network for cellular communications .
  • LCS Location Service
  • UE target user equipment
  • UE User Equipment
  • GSM Global System for Mobile communication
  • UMTS Universal Mobile Telecommunications
  • GMLCs Gateway Mobile Location Centers
  • PLMN Public Land Mobile Network
  • the location information may be requested by and reported to a client application associated with the UE, or by a client within or attached to the core network.
  • the positioning feature may be used internally by ' the access network or attached networks, e.g.
  • the positioning feature may also be used by an emergency service (which may be mandated or "value-added”), but the position service is not exclusively for emergencies. More in detail, it is explained in document 3 GPP TS 23.271 N6.4.0, 3rd Generation Partnership Project, Technical Specification Group Services and System Aspects, Functional stage 2 description of LCS, Release 6, which is hereby incorporated by reference, there are generally four categories of usage of the location service. These are the Commercial LCS, the Internal LCS, the
  • the Commercial LCS (or Value Added Services) will typically be associated with an application that provides a value-added service to the subscriber of the service, through knowledge of the 'UE location and, if available, and at the operator's discretion, the positioning method used to obtain location information. This may be, for example, a directory of restaurants in the local area of the UE, together with directions' for reaching them from the current UE location.
  • the Internal LCS will typically be developed to make use of the location information of the UE for Access Network internal operations. This may include, for example, location assisted handover and traffic and coverage measurement.
  • the Emergency LCS will typically be part of a service provided to assist subscribers who place emergency calls. In this service, the location of the UE caller and, if available, the positioning method used to obtain the location information is provided to the emergency service provider to assist them in their response. This service may be mandatory in some jurisdictions. In the United
  • the Lawful Intercept LCS will use the location information to support various legally required or sanctioned services.
  • the position information shall be reported in standard co-ordinates, for instance geographical co-ordinates, together with the time-of-day and the estimated errors or uncertainty of the location of the UE. It shall be possible for the majority of UEs within a network, both active or idle, to use the feature without compromising the radio transmission or signaling capabilities of the access networks.
  • the UE and the network may support a number of different positioning methods.
  • the UE may support privacy invocation'request and response.
  • the present invention is directed to such UE.
  • the UE informs the core network and radio access network about its LCS capabilities in this respect.
  • LCS entities such as LCS clients and servers, which communicate between themselves by the messaging and signalling capabilities of the Access Network. Clients submit their requests to an LCS server for receiving information about positioning a UE.
  • methods are known and defined i which privacy checks are performed in response to a positioning request by an LCS client.
  • an LCS client can specify the required level of accuracy for the positioning request and a location information or and error code can be returned to the LCS client, depending on whether the LCS client request complies with the required Quality of Service (QoS) or not.
  • QoS Quality of Service
  • a mobile subscriber defines a Subscriber Location Privacy Profile (SLPP) stating which LCSs are allowed to request and obtain positioning information from the mobile subscriber or user equipment and in which areas.
  • SLPP Subscriber Location Privacy Profile
  • an LCS is either allowed or denied access to receive positioning information concerning a certain mobile subscriber, so that many times mobile subscribers simply deny access to an LCS out of caution in order to preserve the desired level of privacy.
  • this is a major drawback which implies important loss of profit and disadvantages both for the operator, since the subscribers are not encouraged in taking advantage of their services, and for the subscribers, who deny themselves of useful services in which they may enroll if their privacy were more under their control.
  • Aim of the present invention is to overcome the above mentioned drawbacks, particularly by providing a method, a service node and a telecommunications system for allowing the subscriber to choose the level of accuracy of the location information to be returned to LCS clients.
  • User equipment in the context of the invention may be a mobile station, a computing device comprising or connected to means for wireless telecommunications, or a handset adapted to provide mobile telecommunications.
  • an object of the present invention is to preserve the standard architecture of the networks without affecting the communications standards among the various entities interacting over the network. Another object is to meet the needs of both the UE subscribers and the LCS client users, through appropriate customization of the allowed and required privacy levels, respectively.
  • a method for positioning accuracy negotiation between a Location Service client (LCS) and a target User Equipment (UE) of a subscriber to be positioned within a network for cellular communications comprising the steps of: receiving a positioning request from the Location Service client for the target User' Equipment at a Gateway Mobile Location
  • GMLC Location Service preferred positioning accuracy level
  • MSC Mobile Switching Center
  • SGSN Serving General Packet Radio Service Support Node
  • GMLC Location Service preferred positioning accuracy level
  • initiating a checking whether the Location Service preferred positioning accuracy level information complies with a maximum positioning accuracy level allowed by the subscriber and in response to a determination that the Location Service preferred positioning accuracy level information complies with the subscriber-allowed maximum positioning accuracy level, returning the location information of the User Equipment to the Location Service client according to the subscriber-allowed maximum positioning accuracy level.
  • the aim and the objects of the invention are also achieved by a service node for positioning accuracy negotiation between a Location Service
  • the service node comprises means for communicating with a Gateway Mobile Location Center (GMLC) supporting Location Service functionality and with the target User Equipment, so as to manage a positioning request provided to the Gateway
  • GMLC Gateway Mobile Location Center
  • the service node comprises: memory means storing a maximum positioning accuracy level allowed by the subscriber; and privacy-checking means for checking whether a preferred positioning accuracy level required by the' Location Service client complies with the maximum positioning accuracy level allowed by the subscriber and for allowing returning of location information of the target User Equipment to the Location Service client according to the subscriber-allowed maximum positioning accuracy level.
  • the service node is selected from the group comprising MSCs and SGSNs.
  • a telecommunications system for positioning accuracy negotiation between a Location Service (LCS) client and a target User Equipment (UE) of a subscriber to be positioned within a network for cellular communications
  • the system comprising: a Gateway Mobile Location Center (GMLC) for supporting Location Service functionality and connected to at least one Location Service client for providing positioning requests to the Gateway Mobile Location Center; a Mobile Switching Center (MSC) or a Serving General Packet Radio Service Support Node (SGSN) for communicating with the Gateway Mobile Location Center and a User Equipment and for managing positioning requests;
  • the system comprises memory means for storing a maximum positioning accuracy level allowed by the subscriber and privacy-checking means for checking whether a preferred positioning accuracy level required by a Location Service client complies with the maximum positioning accuracy level allowed by the subscriber and for allowing returning of the location information of the target User
  • the positioning request may advantageously comprise information about a minimum positioning accuracy level required by the LCS client, below which a returned location of the UE would be too imprecise to be acceptable by the LCS.
  • the LCS client-required positioning accuracy level information in response to a determination that the LCS client-required positioning accuracy level information does not in general comply with the subscriber-allowed maximum positioning ' accuracy level, for instance if the preferred accuracy desired by the LCS does not match the subscriber's settings, it is checked whether such LCS client-minimum positioning accuracy level complies with the maximum positioning accuracy level allowed by the subscriber; and, if so, a location information of the UE is returned to the LCS client according to the maximum positioning accuracy level allowed by the subscriber.
  • the LCS client may be associated with any one of the GSM or UMTS networks, either in a Circuit Switching (CS) or in a Packet Switching (PS) domain.
  • a location information of the UE according to the positioning accuracy level required by the LCS client is in any case returned to the LCS if the LCS is an Emergency Services or a Lawful Interception Services client, thus leaving existing constraints and methods, concerning particular situations, unaffected by the additional functionality introduced by the present invention.
  • the step of checking whether the LCS client-required positioning accuracy level information complies with a maximum positioning accuracy level allowed by the subscriber is performed at the MSC or at the SGSN or, according to another aspect of the present invention, at the GMLC.
  • the maximum positioning accuracy level allowed by the subscriber may be defined through a first parameter in a Subscriber LCS Privacy Profile stored in at least one of the MSC, SGSN or GMLC or in a Home Location Register (HLR) or in a Visitor Location Register (VLR) or in any external entity of the network communicating with the GMLC. If the parameter is stored at an HLR, it is then transferable to the VLR by ' means of a conventional Mobile Application Part (MAP) service used for inserting subscriber data.
  • MAP Mobile Application Part
  • the subscriber may define a different maximum positioning accuracy level for each LCS 'client or groups of LCS clients, further to a maximum accuracy level that it may set as a default value against all positioning requests.
  • the minimum positioning accuracy level required by the LCS client may be forwarded from the GMLC to the MSC or SGSN by means of a Mobile Application Part (MAP) service.
  • MAP Mobile Application Part
  • the GMLC may receive the UE positioning accuracy level information from the HLR HSS and then (if the checking steps according to the invention reveal that the LCS request can be met) forward the LCS request to the MSC/SGSN, which accordingly duly returns the location information according to the maximum positioning accuracy level.
  • Figure 1 is a block diagram of a conventional cellular network
  • Figure 2 is a block diagram of a conventional Positioning System architecture
  • Figure 3 is a block diagram of a Positioning System architecture according to the present invention
  • Figure 4 is a flow chart illustrating the steps involved in positioning a UE according to the present invention when a positioning request is submitted by an LCS
  • Figure 5 is a flow chart illustrating second steps involved in positioning a UE according to the present invention when a response is returned to the LCS.
  • the network 10 is for instance a second generation Global System for Mobile Communications (GSM) Public Land Mobile Network (PLMN) or a third generation UMTS network.
  • GSM Global System for Mobile Communications
  • PLMN Public Land Mobile Network
  • UMTS Third Generation UMTS
  • the cellular network 10 comprises areas 11, hereby identified as Geographical Areas, each of which is handled by a Mobile Switching Center (MSC) 20 and preferably comprises a Visitor Location Register (VLR).
  • MSC Mobile Switching Center
  • VLR Visitor Location Register
  • Each Geographical Area comprises in turn a plurality of cellular areas or cells 12.
  • Each cell 12 is provided with a Base Transceiver Station (BTS) 13 which allows a UE located within the radio coverage of the cell to communicate with a corresponding cellular network 10 or Radio Access Network.
  • BTS Base Transceiver Station
  • Figure 2 displays a conventional positioning architecture showing two different kinds of Radio Access Networks,' particularly a GSM Radio Access network 120 and a UMTS Radio Access Network 130, each of which is provided with Serving Mobile Location Center (SMLC) functionality.
  • the GSM Radio Access Network 120 is connected to a 2G (2 nd generation) Mobile Switching Center (2G-MSC) 121 arid to a 2G-Serving GPRS support node
  • the 2G-SGSN 122 Similarly, the UMTS Radio Access Network is connected to a 3G (3 rd generation)-MSC (3G-MSC) 131" and to a 3G-SGSN 132.
  • the SGSNs contain functionality responsible for managing positioning requests of a Locations Service (LCS) client 2.
  • the LCS functions of SGSNs and/or MSCs are related to charging and billing, LCS 'co-ordination, authorisation and operation of the LCS services and, most particularly, with regard to present invention, location request.
  • the 2G-MSC 121, 3G-MSC 131, 2G-SGSN 122 and 3G-SGSN 132 are connected to a Gateway Mobile Location Center (GMLC) 30, which contains functionality required to support Locations Services.
  • GMLC Gateway Mobile Location Center
  • the GMLC 30 is the first node that an external LCS client 2 accesses in a mobile network, and may request routing information from the Home Location Register or Home Subscriber Server (HLR/HSS) 40.
  • the HLR/HSS also contains the address to the Privacy Profile Register (PPR), which is used for privacy checks.
  • PPR Privacy Profile Register
  • the HLR/HSS 40 which is shown in Figure 2 as a separate entity, may be also positioned within a MSC/VLR 121, 131 and, as it is in the illustrative example of Figure 2, may serve several MSCs.
  • FIG 3 a block diagram is shown illustrating a Positioning System according to the present invention.
  • Figure 3 displays a User Equipment 1, a Radio Access Network 100, which generically identifies any kind of mobile access networks, like the GSM RAN 120 and UMTS RAN 130 of Figure 2 and their SMLC functionality, a service node 20 (briefly referred to as "MSC" in the figures) which generically identifies both MSCs and SGSNs, for instance 2G-MSC 121, 3G-MSC
  • an LCS client 2 sends to the GMLC 30 a Positioning Request concerning UE 1.
  • the GMLC 30 conventionally requests to the HLR HSS 40 routing information required to reach the UE 1.
  • the GMLC 30 sends a Positioning Request to the service node 20 (step 410), which sets the value of a new FIXED_ACCURACY_LENEL parameter to an initial value.
  • the FIXED_ACCURACY_LENEL is set to the value indicated in the positioning request sent by the LCS 2 as a preferred value.
  • such value is deemed to be initially set to INFINITE, wherein INFINITE is an exemplary value indicating that the value of FIXED_ACCURACY_LEVEL does not influence, so far, the conventional positioning procedure, and may correspond, for instance, to a value that is greater than or equal to the maximum accuracy level that can be handled in the cellular network 10.
  • INFINITE is an exemplary value indicating that the value of FIXED_ACCURACY_LEVEL does not influence, so far, the conventional positioning procedure, and may correspond, for instance, to a value that is greater than or equal to the maximum accuracy level that can be handled in the cellular network 10.
  • a value of "0" may be considered to be the lowest possible accuracy level or no accuracy at all, while increasing values identify increasing accuracy.
  • the accuracy may be expressed through any convention. For instance, by way of example and for illustrative purposes only, Accuracy Level
  • Accuracy Level “0" may indicate that no positioning is allowed
  • Accuracy Level “1” may indicate that the accuracy level refers to a first group of Geographical Areas 11
  • Accuracy Level “2” may indicate that the accuracy level refers to a second group of Geographical Areas 11 which is a subset of the first group
  • Accuracy Level “3” may indicate that the accuracy level refers to a third group of Geographical Areas 11 which is a subset of the second group
  • Accuracy Level “4" may indicate that the accuracy level refers to a single Geographical Area 11
  • Accuracy Level "5" may indicate that the accuracy level refers to a group of cells 12 within a Geographical Area 11, and so forth, until the best available level of accuracy is reached, down to a single cell 12 or to even more precise area positioning which may be available in the art.
  • step 415 it is conventionally checked whether the UE 1 allows positioning or not. If not, at step 420 it is checked whether the LCS client 2 requesting positioning information is nevertheless authorised to bypass the UE's SLPP, for instance in case that the LCS client 2 is an Emergency LCS or a Lawful Intercept LCS client. If so, a conventional positioning procedure is performed starting from step 500. Otherwise, the Positioning Request is rejected, the LCS client 2 is notified accordingly (step 425) and the procedure is terminated.
  • the new preferred procedural steps according to the present invention are now described starting from block 430. In fact, if the conditional statement of block 415 is true, i.e. if the UE 1 allows positioning, the service node 20 according to the invention checks in database 25 whether a Maximum Accuracy Level has been set by the UE 1. The Maximum Accuracy Level could be part of the Subscriber LCS
  • the subscriber may define the Maximum Accuracy Level against a specific LCS Client in the External LCS Client list or as a common value against a specific class of LCS Clients. If no Maximum Accuracy Level is set, then the value of FIXED_ACCURACY_LENEL remains unchanged and set to INFINITE, and a conventional positioning is carried out starting at block 500. On the other hand, if a Maximum Accuracy Level is set, then service node
  • FIXED_ACCURACY_LENEL is updated accordingly (step 435).
  • a further check is optionally carried out, so as to verify whether the LCS's positioning request indicates a minimum value below which the accuracy level is deemed to be pointless or useless for the LCS 2, i.e. the positioning information is deemed to be too imprecise and is not acceptable. If no minimum value was set by the LCS 2, then the positioning procedure is carried on from step 500. However, in this case, it is to be noted that the remaining steps of the positioning procedure will be influenced by the value of FIXED_ACCURACY_LENEL, which is now set to the Maximum Accuracy
  • the corresponding value is retrieved by the MSC at step 445. It shall be noted that such value is preferably stored in the Positioning Request submitted by the LCS 2, but may likewise be stored or integrated with further information stored in a database accessible by the MSC, for instance if an LCS wishes to set a Minimum Accuracy Level to be used against any UE or a Minimum Accuracy Level which is to be used any time he requests positioning of a registered UE 1. Additionally, the minimum positioning accuracy level may be defined in the GMLC and transferred to the MSC upon receiving of a positioning request.
  • the MSC checks whether the Minimum Accuracy Level indicated by the LCS 2 is compatible with the Maximum Accuracy Level set by the UE 2. It shall be noted that, although the check is preferably performed at the MSC node, it could be likewise performed at an SGSN node or GMLC node or in any accessible external entity of the network. More in detail, in order for the positioning to be allowable, the Minimum Accuracy Level requested by the LCS 2 must be equal to or lower than the Maximum Accuracy Level set by the UE. If so, the value of FIXED_ACCURACY_LEVEL remains unchanged, i.e. set to the Maximum
  • step 500 the positioning procedure is carried on from step 500. Also in this case, the remaining steps of the positioning procedure will be influenced by the value of FIXED_ACCURACY_LEVEL. If the Minimum Accuracy level set by the LCS 2 is greater than the Maximum Accuracy Level set by the UE 1, then the positioning procedure is carried on from step 420. The remaining steps of positioning procedure following step 500 will be now described with reference to Figure" 5. ' At step 505, UE paging, authentication and ciphering is conventionally carried out between the service node 20 and the UE 1, so as to determine the cell
  • the service node 20 may send to the UE an LCS Location Notification Invoke and waits for the LCS Location Notification Return Result (step 515).
  • a Location Request message is then submitted by the service node 20 to the RAN 100, including the FIXED_ACCURACY_LEVEL indication as set or modified through the above described positioning steps of the data flow of Figure 4.
  • the RAN 100 communicates with the UE 1 to determine the positioning method to be used and to instigate the particular message sequence for that method.
  • the RAN 100 returns it to the service node 20 server in a Location Report message.
  • the information about the positioning method used may be returned with the location information. If a location information could not be obtained, the RAN 100 returns a Location Report message containing a failure cause and no location information. In turn, the service node 20 returns the location information to the GMLC 30, which eventually returns the location information to the LCS 2.
  • the positioning accuracy negotiation returned to the LCS does not exceed the positioning accuracy allowed by the subscribers, thus preserving their privacy to the desired extent, and is no less than the minimum required accuracy accepted by the LCS client.
  • the skilled in the art easily understands that the above described steps may be performed by any computer hardware and/or software and telecommunication means programmed through conventional techniques in order to take into account the additional information data needed by the present invention.
  • a combination of CPU, memory and communications means is required in order to check the availability of the a maximum accuracy level allowed by a UE and a minimum accuracy level required by the LCS, together with comparing means, preferably implemented through software, for comparing the two parameters and returning a result.

Abstract

L'invention concerne un procédé de négociation de précision de positionnement entre un client de service de localisation (LCS) et un équipement utilisateur cible (UE) d'un abonné à localiser dans un réseau de communications cellulaires. Ce procédé consiste à recevoir une demande de positionnement du client LCS pour l'UE cible au niveau d'un centre de localisation de mobiles tête de ligne (GMLC); à envoyer un message comprenant la demande de positionnement du GMLC au centre de commutation mobile (MSC) ou à un noeud de support GPRS de desserte (SGSN) et comprenant des informations relatives à un niveau de précision de positionnement préféré requis par le client LCS; à vérifier si les informations de niveau de précision de positionnement requis par le client LCS est conforme à un niveau de précision de positionnement maximum autorisé par l'abonné; et, en réponse à la détermination du fait que les informations relatives au niveau de précision de positionnement requis par le client LCS sont conformes au niveau de précision de positionnement maximum autorisé par l'abonné, à renvoyer les informations de localisation de la station mobile au client LCS selon le niveau de précision de positionnement maximum autorisé par l'abonné.
PCT/IT2003/000515 2003-08-22 2003-08-22 Procede et systeme de telecommunications pour la negociation de la precision de positionnement entre un client de service de localisation et un equipement utilisateur d'un abonne WO2005029902A1 (fr)

Priority Applications (2)

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AU2003264875A AU2003264875A1 (en) 2003-08-22 2003-08-22 Method and telecommunications system for positioning accuracy negotiation between a location service client and a target user equipment of a subscriber
PCT/IT2003/000515 WO2005029902A1 (fr) 2003-08-22 2003-08-22 Procede et systeme de telecommunications pour la negociation de la precision de positionnement entre un client de service de localisation et un equipement utilisateur d'un abonne

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PCT/IT2003/000515 WO2005029902A1 (fr) 2003-08-22 2003-08-22 Procede et systeme de telecommunications pour la negociation de la precision de positionnement entre un client de service de localisation et un equipement utilisateur d'un abonne

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EP1916832A1 (fr) * 2005-08-15 2008-04-30 Huawei Technologies Co., Ltd. Procede et systeme d'interrogation de l'etat d'itinerance de l'utilisateur appele
EP1916832A4 (fr) * 2005-08-15 2010-11-17 Huawei Tech Co Ltd Procede et systeme d'interrogation de l'etat d'itinerance de l'utilisateur appele
WO2007019773A1 (fr) 2005-08-15 2007-02-22 Huawei Technologies Co., Ltd. Procede et systeme d'interrogation de l'etat d'itinerance de l'utilisateur appele
EP1933582A3 (fr) * 2006-12-13 2008-06-25 LG - Nortel Co., Ltd. Procédé pour fournir des services de localisation dans un réseau WiMAX quel que soit l'état de la station mobile
KR100941544B1 (ko) 2006-12-13 2010-02-10 엘지노텔 주식회사 이동단말의 상태에 무관한 ＷｉＭＡＸ 망에서의 위치서비스 제공 방법
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US9913174B2 (en) 2007-11-09 2018-03-06 Huawei Technologies Co., Ltd Method, device and system for implementing optimized inter-rat handover
US8477725B2 (en) 2007-11-09 2013-07-02 Huawei Technologies Co., Ltd. Method, device and system for implementing optimized inter-RAT handover
US20120203451A1 (en) * 2011-02-09 2012-08-09 Eung Sun Kim Apparatus and method for integrated positioning
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CN103813264A (zh) * 2012-11-12 2014-05-21 中国电信股份有限公司 处理定位请求的方法、系统和移动交换机
CN103813264B (zh) * 2012-11-12 2018-07-03 中国电信股份有限公司 处理定位请求的方法、系统和移动交换机
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