EP1407632A1 - Procede et dispositif pour determiner la position d'appareils abonnes d'un systeme de radiocommunication a l'aide d'elements de position supplementaires - Google Patents

Procede et dispositif pour determiner la position d'appareils abonnes d'un systeme de radiocommunication a l'aide d'elements de position supplementaires

Info

Publication number
EP1407632A1
EP1407632A1 EP02750816A EP02750816A EP1407632A1 EP 1407632 A1 EP1407632 A1 EP 1407632A1 EP 02750816 A EP02750816 A EP 02750816A EP 02750816 A EP02750816 A EP 02750816A EP 1407632 A1 EP1407632 A1 EP 1407632A1
Authority
EP
European Patent Office
Prior art keywords
radio
signal
pell
base station
cell
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Withdrawn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
EP02750816A
Other languages
German (de)
English (en)
Inventor
Mark Beckmann
Thomas Gottschalk
Siegfried Bär
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1407632A1 publication Critical patent/EP1407632A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention relates to a method for determining the position of at least one subscriber device of a radio communication system, which has a multiplicity of base stations for division into radio cells, at least one location measurement signal being transmitted by at least one additional position element from at least one radio cell,
  • radio communication systems such as According to the GSM or UMTS standard, it may be of interest in practice to determine the current location or location of a particular subscriber device, in particular a mobile radio device.
  • the requirements for determining the position of the respective subscriber device can come from the respective subscriber himself, another subscriber, as well as from the network infrastructure side.
  • the invention has for its object to show a way how a position determination of the respective subscriber device can be carried out as efficiently as possible in a radio communication system.
  • This object is achieved in a method of the type mentioned at the outset in that the respective position element monitors the radio signaling on the air interface of the respective base station to determine whether a position request signal is being transmitted to and / or by the latter, and that when such a position request signal is detected by such a listening position element is automatically sent at least one location measurement signal during at least one free signal section of the radio signaling on the air interface of the base station of its assigned radio cell.
  • the signaling on the air interface is listened to for a possible position request signal from the respective position element in the location and / or neighboring radio cell of the subscriber device to be located, and when such a position request signal is detected by such a "listening" position element independently at least one location measurement signal during at least one free signal section of the radio signaling is inserted and transmitted on the air interface of the base station of its assigned radio cell, a position determination is made possible in an effective manner.
  • the invention also relates to a device for determining the position of at least one subscriber device according to the invention of a radio communication system, which is carried out according to one of the preceding claims.
  • FIG. 1 shows a schematic illustration of a radio cell of a radio communication system, in which the position of a mobile radio device located there can be determined using position elements according to a first variant of the method according to the invention
  • Figure 2 shows the others in a schematic representation
  • FIG. 3 shows a schematic representation of the temporal structure of a time frame of the radio signaling on the air interface between a base station and a subscriber device to be located in the radio communication system according to FIGS. 1 and 2, a location measurement signal from a listening position element according to the invention in a free signal section of a time slot of this time frame Procedure has been inserted independently, and
  • FIG. 4 shows a schematic representation of a further variant of the method according to the invention for determining the position of a subscriber device of the radio communication system according to FIG. 2.
  • FIG. 2 shows a simplified radio communication system MCS, in which message signals, in particular, via at least one predefined air interface LSI between at least one subscriber device Mobile radio device such as UE1, and at least one base station such as NB, SB are transmitted using a time-division multiple access transmission method.
  • MCS message signals, in particular, via at least one predefined air interface LSI between at least one subscriber device Mobile radio device such as UE1, and at least one base station such as NB, SB are transmitted using a time-division multiple access transmission method.
  • UMTS universal mobile telecommunication system
  • message signals via the respective air interface in particular according to a combined TDMA / CDMA multiple access transmission method
  • TDMA time division multiple access
  • CDMA code division multiple access
  • TDD time division duplex
  • uplink signal transmission from the mobile radio device to the respective base station
  • downlink signal transmission from the respectively assigned base station to the mobile radio device
  • uplink signal transmission from the mobile radio device to the respective base station
  • downlink signal transmission from the respectively assigned base station to the mobile radio device
  • uplink signal transmission from the mobile radio device to the respective base station
  • downlink signal transmission from the respectively assigned base station to the mobile radio device
  • a single carrier frequency is used for signal transmission in the uplink and downlink direction.
  • the message signals are divided into a number of successive time slots of a predefinable time period with a predefinable time frame structure.
  • a number of subscribers who simultaneously communicate with the base station there in the same radio cell are advantageously separated from one another in terms of their message / data connections by orthogonal codes, in particular by the so-called CDMA (code division multiple access) method, in combination with time division multiplex division ,
  • CDMA code division multiple access
  • Mobile radio telephones in particular cell phones, are preferably provided as subscriber devices.
  • other message and / or data transmission devices with an associated radio unit such as Internet computers, televisions, notebooks, fax machines, etc. for communication traffic "on air", ie via an air interface, components of the radio communication network.
  • the subscriber devices can also be arranged stationary, ie stationary, in the radio network. However, they are preferably designed to be portable and can therefore be mobile, that is to say at changing locations.
  • the mobile radio system MCS usually has a multiplicity of base stations, to which mobile radio cells are respectively assigned, i.e. each base station spans a radio cell and supplies it with regard to radio traffic via at least one air interface. Within such a radio cell, its base station is responsible for communication with the subscriber device that is located there. The respective base station is preferably arranged approximately in the center of its radio cell (see FIG. 1).
  • a user device UE1 to be located is located in the radio cell of the base station SB.
  • the subscriber device UE1 is here
  • a base station is a network component that serves and controls mobile devices in a mobile radio cell via at least one air interface.
  • the base station SB in FIG. 2 is the network component that currently operates and controls the mobile terminal UE1 to be located in its current residential radio cell, ie a serving mobile radio cell, via the air interface LS.
  • SRNC Serving Radio Network Controller
  • a serving radio network controller is therefore a network component for the operation and control of one or more base stations, which are called UMTS NodeBs.
  • the serving radio network controller and the base stations assigned to it form a so-called radio network system (RNS).
  • RNS radio network system
  • Several RNS systems in turn are combined in UMTS to form a logical system unit UTRAN (Universal Terrestrial Radio Access Network).
  • the MSC carries out all the necessary functions for circuit switched services from and to the mobile stations.
  • a communication link for an external location application (such as position determination) or an external location client (LCS client) is made possible via a connection unit GMLC (Gateway Mobile Location Center).
  • This connection unit GMLC is connected to a so-called "home location register" HLR, to which a mobile user is assigned for protocol or control purposes (for example user information).
  • An external localization unit such as an LCS client ELCS (location services) - user system (such as emergency call centers, monitoring centers, position-dependent information services) can come into contact with the MCS radio communication system via the connection unit GMLC.
  • LCS client ELCS location services
  • the mobile radio device UE1 has already established an active, existing communication connection to the base station SB in its stay radio cell.
  • This evaluation / computing unit can in particular also be part of the respective base station and / or can be implemented in the respective mobile radio device UE1 itself.
  • FIG. 1 shows an example of the radio cell CE1 from the large number of radio cells of the radio communication system according to FIG. 2.
  • This radio cell is supplied with radio technology by the approximately centrally located base station NB1.
  • the position i.e. To be able to determine the local position of the mobile radio device UE1 currently in the radio cell CE1, there are several position elements in the radio cell CE1 such as e.g. PEll additionally distributed with PE14. They are preferably placed in the area of the outer borders of the radio cell CE1.
  • the base station NB1 itself now sends one or more associated location measurement signals PS1 with PS4 via their air interface LSI, the duration of which for their path
  • Mobile radio device UE1 is located on this circle RTK with a constant radius.
  • RTT measurement round trip time
  • Mobile radio device UE1 is located on this circle RTK with a constant radius.
  • At least two further distance circles CI1 and CI3 are determined via corresponding runtime measurements of these location measurement signals by the mobile radio device UE1.
  • the distance circle CI1 identifies those locations at which a location measurement signal of the position element PEll has the same transit time for its path to the mobile radio device UE1.
  • the distance circle CI2 describes those locations at which a location measurement signal of the position element PE13 has the same transit time for its path to the mobile radio device UE1. Only the intersection of all three distance circles RTK1, CI1, CI2 clearly indicates the local position of the mobile radio device UE1.
  • the position elements PEll are expediently synchronized with PE14 with respect to the time pattern of the radio signaling on the air interface LSI of the base station NB1. This is because the starting time of the location measurement signals of the position elements is clearly defined, which facilitates the evaluation of the transit times of the location measurement signals.
  • CI3 - as with the so-called OTDOA method (observed time of arrival) - location hyperbolae may also be determined on the basis of the location measurement signals.
  • OTDOA position element measurement method observed time difference of arrival
  • the core of this position determination method is that one or more position elements (PE) are introduced per cell, with whose support position determinations can be carried out according to the principle of the OTDOA method.
  • the number of position elements is preferably determined by the network operator in accordance with the local conditions (such as topography) of the respective mobile radio cell and the required accuracy of the position determination.
  • the PEs it is possible to use the signals for position determination only in the cell in which the UE to be determined is located.
  • Signals from other NodeBs (in the neighboring mobile radio cells) for the OTDOA evaluation are basically no longer necessary. However, they can of course still be used if they are present and detected.
  • the PEs preferably have two main tasks:
  • UEs user equipments
  • the listening and transmission takes place on a frequency, in particular the downlink frequency of the mobile radio cell (serving cell). This means e.g. the frequency of the broadcast channel BCH.
  • a frequency in particular the downlink frequency of the mobile radio cell (serving cell).
  • both processes, listening and sending are expediently separated from one another in time, so that there can and should not be any overlap.
  • Cellular cell position elements available from the respectively assigned base station or serving nodeB infor- (via higher signaling layers or via the BCH) to send their assigned signal code in a specific downlink slot (DL slot).
  • DL slot downlink slot
  • the location measurement signals could now be sent to the mobile radio devices at certain times and in certain free signal sections of the DL slot of the transmission signal of the serving nodeB, i.e. the position elements could place their unique signal code sequences in signal sections of the signaling of the serving nodeB specified by the respective serving nodeB to the mobile radio devices of this mobile radio cell.
  • this could be signal sections of the BCH that it is not using or signal sections in the still unused data part of a slot.
  • the subscriber device to be localized would of course also know of the signal sections in which the position elements send their signal codes.
  • the subscriber device to be located in each case could, in accordance with the signaling timing, attempt to detect the signal codes of the PEs in this specific part of the DL slot and thereby determine the arrival times of the signal codes.
  • the further procedure and determination of the position could take place in accordance with the known OTDOA method.
  • the position elements would be configured by the respective base station or serving nodeB of the current location radio cell of the mobile radio device to be located, i.e. the serving nodeB would inform the position elements at what time in the DL slot (downlink connection between NodeB and UE) the position elements may send the signal code sequences assigned to them.
  • the serving nodeB would inform the position elements at what time in the DL slot (downlink connection between NodeB and UE) the position elements may send the signal code sequences assigned to them.
  • the following problem could arise in unfavorable constellations:
  • the position elements can change the configuration information in the BCH due to poor cellular channel conditions do not detect, ie do not evaluate, and therefore have no possibility of sending their signal code sequences at the correct timing (insertion start times) of the DL connections.
  • the reception of the respective PE signal code can be incomplete or can only take place in "fragments". Incorrect detection of the PE signal code in the receiver is possible. This would make it very difficult or even impossible to support the position determination with position elements of one or more mobile radio devices (UEs) in the relevant mobile radio cell.
  • UEs mobile radio devices
  • RRC radio resource control
  • the UEs in the serving cell are able to listen to the signal codes of the PEs from the neighboring cells.
  • the UEs After sending a position request PAS (see FIG. 1), the UEs try after a short delay phase (resulting from the time it takes for a PE to "listen" to the request and then send its signaling code) to detect known PE signal code sequences without the time of the free signal sections being explicitly communicated to them by the NodeB.
  • a short delay phase resulting from the time it takes for a PE to "listen” to the request and then send its signaling code
  • the possibility of information about free signal sections of the NodeB to the UEs for e.g. PE signal code sequences may still be possible if desired, required or required.
  • An important advantage is in particular the possibility of reducing the signaling overhead of the NodeB to the UEs or PEs in the serving cell, since the position elements now automatically insert location measurement signals into free, existing signal sections of the radio signaling. If the PEs act "independently" while listening in (or eavesdropping) on a position request by a UE to the serving nodeB (location request) in the serving cell, the signaling between PEs and serving nodeB can be saved or avoided with regard to time and signaling, ie a disruptive signaling overhead in the cell can be avoided ,
  • a next advantage to be stated is the possibility of using PEs from the neighboring mobile radio lines if they "listen" to the position request of a UE from a neighboring cell.
  • the method according to the invention can be used both in the FDD mode (frequency division duplex) and in the TDD mode of UMTS.
  • the base station NB1 spans the UMTS mobile radio cell CE1 (UMTS cell1). Neighboring radio cells should not play a role in the first embodiment.
  • this NodeB is controlled by an RNC. Together with this, this results in part of a radio system with a control organ, base station, mobile radio devices and position elements.
  • the mobile radio device UE1 to be located is located in the UMTS mobile radio cell CE1, the serving cell, and is supplied or operated by this base station NB1.
  • the request PAS for position determination can originate both from the mobile radio device UE1 itself and from one or more network components of the radio communication system and thus from any requesting LCS client in the network of the radio communication system (FIG. 2).
  • the mobile device UE1 always establishes an RRC connection to the base station or NodeB NB1 in order to announce the confirmation of the position request PAS to the base station NB1.
  • PEs position elements
  • UMTS cell1 UMTS cell1
  • these are the elements PEll, PE12, PE13 and PE14.
  • the PE distribution in the UMTS mobile radio cell CE1 (UMTS cell1) is carried out in such a way that at least the signals from two PEs can be “heard” by the mobile radio device UE1 in the radio cell CE1, ie can be detected.
  • the mobile radio device UE1 is located in the UMTS mobile radio cell CE1 (UMTS celll) close to the right cell boundary, so that there is the possibility that it can evaluate position measurement signals of the closest position elements PE13 and PE14 when a position is requested.
  • problems can arise with regard to the detection of the signals of the other PEs that are too far away (such as PEll and PE12), because these PEs are difficult or impossible to detect by the mobile radio device. The reasons are the greater distances, thereby weaker signal powers and possibly quantitatively more shadowing in the distance between the PEs and the mobile device UE1.
  • An example of a sequence scenario can be as follows: The position of the mobile radio device UE1 in the UMTS mobile radio cell CE1 (UMTS celll) is to be determined on the basis of a position request PAS. It does not matter why and where a position request came from. Regardless of the accuracy of the position determination defined in the requirements, which is decided by the network (mainly from the RNC), the mobile radio device prepares to use position elements (PEs), ie to listen to the signaling codes of the PEs of the mobile radio cell CE1 , First, the NodeB NBl is informed with the help of a confirmation of the position request PAS.
  • PEs position elements
  • the NodeB can optionally also inform the PEs of the mobile radio cell via the BCH about the times when the respective PE inserts its assigned signal code into the DL slot structure from the NodeB to the UE.
  • the PEs can use this information in particular, for example, after a The first attempt to position the position failed. Of course, this also gets this information UE communicated, since the UE also hears the DL connection of the Serving-NodeB (NodeB).
  • the position request is also known to the PEs in the vicinity of the UE to be localized by means of “listening in” or “intercepting” the information element — “location update” - in the RRC message. After evaluating this information element, the position elements PEll, PE12, PE13 and PE14 now insert their signal code sequences as position measurement signals into the respective DL-, regardless of "commands" of the Serving-NodeB (NodeB).
  • Time shifts can be determined by correlations) to determine reception times of the code sequences.
  • the mobile radio device UE1 sends this information to the serving NodeB (NodeB).
  • NodeB or the PCF (position calculation function) in the UTRAN determines the time differences between the reception times of the PE signal code sequences. These differences are preferably mapped on spatial hyperbolas and / or distance circles according to the known ODTOA method. The common intersection of the hyperbolas is the sought position in a range of accuracy values that depends on the environment.
  • FIG. 3 shows a schematic representation of the temporal structure of a time frame FRi for radio signaling on the air interface LSI between the base station NB1 and the mobile radio device UE1 from FIG. 1 to be located
  • the inventive method has been inserted independently.
  • the time frame FRi of the time length TF has a large number of individual, time-sequential time slots SL0 with SL14, each of the same, consistent constant duration. Such time frames follow one another successively, that is to say continuously in the transmission of messages. This is indicated in FIG. 3 by three dots at the beginning and end of the time frame FRi.
  • a TDD frame such as FRi preferably consists of a total of 15 time slots SLO with SL14. Each time slot can be uniquely allocated either for transmissions in uplink or downlink traffic, ie reserved or made available.
  • the respective time slot e.g. SLi has 4 time sections or time sections DA1, MI, DA2, PC2, which are reserved for the transmission of different groups of signal types.
  • the first time period DA1 of the time slot SLi is pre-assigned for the transmission of user data, so-called data symbols.
  • so-called midambles are transmitted in the second, subsequent time segment or block MI.
  • These are signals for the channel estimation and / or synchronization of the respective subscriber device and / or the respective base station. Based on these channel estimation parameters, a channel equalization is carried out in the respective mobile radio device and / or the respective base station. After this time block MI there is again a time period DA2 for a further transmission of user data. Because the
  • the radio transmission of a so-called burst can thus take place with a predetermined time division or sectioning during the respective time slot.
  • a so-called burst data bundle
  • a time frame and time slot structure is provided in the respective mobile radio standard, here in the exemplary embodiment in particular in the UMTS standard (eg 3G TS 25.221 "physical channels and mapping of transport channels onto physical channels (TDD)", version 3.2.0 (2000-03), 3G TS 25.305 "stage 2 functional specification of location Services in UTRAN”, version 3.1.0 (2000-03, 3G TS 25.224 “physical layer procedures (TDD)", version 3.2.0 (2000-03 ).)
  • the signaling code PS1 of one of the position elements such as PEll transmitted during time period DA1 in time slot SLi of time frame FRi, since a free signal section was available here.
  • Embodiment 2 (use of PEs from neighboring cells):
  • Embodiment 2 according to FIG. 4 is based on the basic principle of the above embodiment 1.
  • the position of the mobile radio device UE1 in the UMTS mobile radio cell CE1 (UMTS celll) is to be determined on the basis of a position request PAS. It is irrelevant why and where a PAS position request came from. Regardless of the accuracy of position determination defined in the requirements, which is decided by the network (mainly from the RNC), the UE prepares to use position elements (PEs), i.e. to listen to the signaling codes of the PEs of the cellular cells CE1 - CE4.
  • PEs position elements
  • the NodeB NBl is informed with a confirmation of the position request PAS.
  • the NodeB can additionally inform the PEs of the mobile radio cell via the BCH about the times when the respective position element (abbreviation PE) can insert its assigned signal code into the DL slot structure from the NodeB to the UE.
  • the PEs can use this information, for example, after a first attempt at position determination has failed. This information is of course also communicated to the UE, since the UE also hears the DL connection of the Serving-NodeB (NodeBi).
  • the position request is also the position elements (PEs), namely PEll and PE14 from the current location mobile radio cell CE1 (UMTS cell1), PE21 from the neighboring mobile radio cell CE2 (UMTS cell2) and PE31 and possibly PE32 from the neighboring mobile radio cell CE3 ( UMTS cell3) in the vicinity of the mobile device UEl to be located by "listening" or “intercepting" the information element - location update - in the RRC message.
  • the named PEs add independently of
  • the mobile radio device UE1 tries to determine reception times of the code sequences.
  • the UEl sends this information to the Serving-NodeB (NodeB).
  • NodeB or the PCF in the UTRAN determines the time differences between the reception times of the PE signal code sequences. These differences are expediently depicted on local hyperbolas and / or distance circles. Their respective common intersection is the sought position in a range of accuracy values dependent on the environment.
  • the localization method described by way of example using a UMTS radio communication system is of course also applicable to other radio communication systems such as applicable according to the GPRS (general packet radio service), EDGE (enhanced data rates for GSM environments) standard.
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM environments

Abstract

Dans un système de radiocommunication cellulaire (MCS), au moins un signal de mesure de repérage (PS1 avec PS4) est émis par au moins un élément de position supplémentaire (PE11 avec PE14) à partir d'au moins une cellule radio (CE1). Selon l'invention, chaque élément de position (PE11) surveille la signalisation radio sur l'interface hertzienne (LS1) de la station de base concernée (NB1) afin de constater si un signal de demande de position (PAS) est transmis à cette station ou par cette station. En présence d'un tel signal de demande de position (PAS), un tel élément de position (PE11) à l'écoute insère de façon autonome au moins un signal de mesure de repérage (PS1) dans au moins un segment de signal libre (DA1) de la signalisation radio.
EP02750816A 2001-07-17 2002-07-02 Procede et dispositif pour determiner la position d'appareils abonnes d'un systeme de radiocommunication a l'aide d'elements de position supplementaires Withdrawn EP1407632A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10134590A DE10134590A1 (de) 2001-07-17 2001-07-17 Verfahren sowie Vorrichtung zur Positionsbestimmung von Teilnehmergeräten eines Funkkommunikationssytems mit Hilfe von zusätzlichen Positionselementen
DE10134590 2001-07-17
PCT/DE2002/002406 WO2003009626A1 (fr) 2001-07-17 2002-07-02 Procede et dispositif pour determiner la position d'appareils abonnes d'un systeme de radiocommunication a l'aide d'elements de position supplementaires

Publications (1)

Publication Number Publication Date
EP1407632A1 true EP1407632A1 (fr) 2004-04-14

Family

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Application Number Title Priority Date Filing Date
EP02750816A Withdrawn EP1407632A1 (fr) 2001-07-17 2002-07-02 Procede et dispositif pour determiner la position d'appareils abonnes d'un systeme de radiocommunication a l'aide d'elements de position supplementaires

Country Status (4)

Country Link
US (1) US7089021B2 (fr)
EP (1) EP1407632A1 (fr)
DE (1) DE10134590A1 (fr)
WO (1) WO2003009626A1 (fr)

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GB2394390B (en) * 2002-10-18 2005-07-06 Ipwireless Inc Arrangement and method for RF filter
GB2394623B (en) * 2002-10-24 2006-08-30 Ipwireless Inc Method and arrangement for channel estimation in a wireless communication system
US8483717B2 (en) 2003-06-27 2013-07-09 Qualcomm Incorporated Local area network assisted positioning
US7920544B2 (en) 2005-03-28 2011-04-05 Qualcomm Incorporated Method and apparatus for enhancing signal-to-noise ratio of position location measurements
US8447319B2 (en) * 2007-11-15 2013-05-21 Andrew Llc System and method for locating UMTS user equipment using measurement reports
CN102077663A (zh) * 2008-06-24 2011-05-25 爱立信电话股份有限公司 用于在无线网络中提供地理位置有关信息的方法

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US5901358A (en) * 1997-07-15 1999-05-04 Omnipoint Corporation Mobile station locating system and method
DE69906592T2 (de) * 1999-05-05 2004-01-29 Nokia Corp Verfahren zur ortsbestimmung von einer mobilstation
DE69936990T2 (de) * 1999-10-06 2008-01-10 Matsushita Electric Industrial Co., Ltd., Kadoma Ortungssystem für ein Mobiltelefonnetz

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Publication number Publication date
US20040137910A1 (en) 2004-07-15
WO2003009626A1 (fr) 2003-01-30
DE10134590A1 (de) 2003-01-30
US7089021B2 (en) 2006-08-08

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