DE10222140A1 - Determination of the position of a mobile telephone uses time sequence transmissions to a group of units within a defined are that defines position - Google Patents

Determination of the position of a mobile telephone uses time sequence transmissions to a group of units within a defined are that defines position

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Publication number
DE10222140A1
DE10222140A1 DE2002122140 DE10222140A DE10222140A1 DE 10222140 A1 DE10222140 A1 DE 10222140A1 DE 2002122140 DE2002122140 DE 2002122140 DE 10222140 A DE10222140 A DE 10222140A DE 10222140 A1 DE10222140 A1 DE 10222140A1
Authority
DE
Germany
Prior art keywords
mobile station
ms1
characterized
ms2
position
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Withdrawn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
DE2002122140
Other languages
German (de)
Inventor
Siegfried Baer
Rainer Eckert
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
Priority to DE2002122140 priority Critical patent/DE10222140A1/en
Publication of DE10222140A1 publication Critical patent/DE10222140A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0284Relative positioning
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/10Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S2205/00Indexing scheme associated with group G01S5/00, relating to position-fixing
    • G01S2205/001Transmission of position information to remote stations
    • G01S2205/006Transmission of position information to remote stations for emergency situations
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009Transmission of position information to remote stations
    • G01S5/0018Transmission from mobile station to base station
    • G01S5/0036Transmission from mobile station to base station of measured values, i.e. measurement on mobile and position calculation on base station
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/14Determining absolute distances from a plurality of spaced points of known location

Abstract

The present invention relates to a method for position determination in a mobile radio system, which comprises the method steps of first determining a position of a first (MS1), second (MS2) and third (MS3) mobile station, and sending a signal from the first mobile station (MS1) to the second (MS2) and third (MS3) mobile station. On the basis of the determination of the distances between the first mobile station (MS1) and the second (MS2) and third (MS3) mobile station, a second position determination of the first mobile station (MS1) takes place.

Description

  • The present invention relates to a method for Positioning and a positioning system.
  • Such methods and systems can be found in Third generation mobile radio systems application.
  • Different systems exist for the position determination system Method. A known system for position determination is GPS (Global Positioning System), which uses Runtime measurements to satellites determine the position of the receiving device becomes. The installation of a in a mobile radio terminal means GPS receiver, however, both higher cost, larger volume as well as reducing the battery life.
  • In the globally established mobile radio system GSM (Global System for Mobile Communication) can not be Standard procedure also a Position determination of a mobile radio terminal can be carried out. in the This process is essentially based on Time difference measurements of signals from different base stations, at a handover initiated by the position request, d. H. a transfer of an ongoing call from a cell into another one. A handover must be done but not necessarily take place.
  • To determine the position of a mobile device within the third generation UMTS (Universal Mobile Telecommunications System) several methods (location service - LCS) in the technical Specification TS 25.305 V3.1.0 of the 3rd generation partnership Project (3GPP) specified. These include A. the so-called Cell ID Based Method, where a Mobile radio device only that supplied by a base station Radio cell can be specified. That from a network supported GPS method (Network Assisted GPS) enables the already mentioned position determination with the help of a GPS Receiver, with a corresponding GPS receiver in the mobile device must be integrated. With the GPS Receiver does not have to be a complete GPS Act module.
  • Another method is the so-called OTDOA-IPDL method (Observed Time Difference of Arrival - Idle Period Downlink) specified. This method is used for position determination Measurements made on signals from UMTS are present, d. H. integral part of the UMTS specification are. In principle, a mobile radio terminal measures the Time difference of signals, which of different Base stations were broadcast. From these time differences and the known positions of the base stations can then Position of the mobile device can be calculated. Details on The position is calculated in DE 100 31 178 A1 described. Such measurements require a mobile device can receive the signals from neighboring base stations. This however, the closer the mobile device gets, the harder it gets located at the base station of your own cell because the Signals of the own base station that of the other base stations overlay more and more. To solve this problem, it is known, all transmissions of the switch off your own base station briefly (IPDL- Procedure) in order to be able to carry out the measurements.
  • The disadvantage of the OTDOA method is that the Positioning accuracy may be insufficient, or that no position determination is possible. There one Implementation of the OTDOA or the network-supported GPS method according to the UMTS standard is not required Emergency for a position determination only the determination of the Residence cell of the user.
  • The present invention is therefore based on the object a method for determining position and a Provide positioning system, which is an improved Ensure position determination.
  • This task is accomplished through a process for Positioning and a positioning system according to the independent claims solved. Advantageous further developments of Invention result from the dependent claims.
  • The present invention relates to a method for determining the position in a mobile radio system. The process has the process steps
    • - First determining a position of a first, second and third mobile station and
    • - Sending a signal from the first mobile station to the second and third mobile station
    on. On the basis of the determination of the distances between the first mobile station and the second and third mobile station, a second position determination of the first mobile station is then carried out.
  • The mobile radio system can basically be any Act type of mobile radio systems. The is preferred present invention used in a UMTS mobile radio system, can also be used in other mobile radio systems. The mobile stations are preferably mobile End devices, which the mobile radio standard of the mobile radio system support.
  • In a further development of the present invention, all Determines mobile stations that are in a radius around the first mobile station. It is checked which one surrounding mobile stations for determining the position of the first Mobile station are available.
  • In a development of the present invention, the Distances by measuring transit time differences below Consideration of a synchronized signal from the Base station determined. When transmitting data is done in cellular differentiate between two transmission directions. The Data transmission from the generally fixed base station to the mobile devices is called transmission in so-called Denoted downlink direction. When transferring data in the Opposite direction speaks from a terminal to the base station one of uplink transmission. With UMTS Mobile radio systems are for transmission over the Air interface provided two modes: With the FDD (Frequency Division duplex) mode, the transmission takes place in up and Downlink on different frequencies. With the TDD (Time Division duplex) mode, only one carrier frequency is used, where the up- and downlink direction. The participants will be at both modes by stamping orthogonal codes on the Information data separated. This is multiple access under the term CDMA (Code Division Multiple Access) known.
  • Only signals that are compatible with a constant and high transmission power are emitted, d. H. in the Normally not subject to performance regulation. Under one Power regulation in mobile radio is generally understood that the transmission power was kept as low as possible to reduce interference from other channels. About that It must also be ensured that the connection is a Minimum quality met. For a first approximation you can found that the transmission power with the distance of the mobile device increases from the base station. The detection probability increases accordingly Neighboring cells. They are particularly suitable in TDD mode so-called beacon channels for the measurement of Runtime differences, since these have a constant and high transmission power be emitted. The beacon channels are physical channels, which at certain points, e.g. B. Time slot or code, certain physical Have characteristics. Beacon channels come with a reference power Posted.
  • The P-CCPCH is preferred as the synchronized signal (Primary Common Control Physical Channel) channel used. at the synchronized signal is a Reference value, which enables synchronization. The P- CCPCH channel has the best properties for in TDD mode the location based services LCS on and is also a Beacon channel.
  • In a further development of the present invention, the second position determination of the first mobile station via the two intersections of two circles with the radii of the certain distances around the second or third mobile station, a selection of the two intersections based on the first Determination takes place. The two circles around the neighboring ones Mobile stations intersect in two points. Hence result there are two positions where the first mobile station can be located. By the first, less precise Position determination can be determined at which of the two intersection points the first mobile station is actually located.
  • In a development of the present invention in addition to the signal, a position signal from the first Mobile station and / or from a surrounding mobile station sent out. With the help of this position signal, the distances between the surrounding mobile stations and the first Mobile station can be determined. But it is also possible that Position signal not from the first mobile station, but from the surrounding mobile stations for position determination is sent out.
  • In a development of the present invention, the second mobile station picks up a GPS receiver, and picks one up Position determination with the help of this GPS receiver. A Appropriate positioning has the advantage that it does the first position determination of the second mobile station very much is accurate, and the inaccuracies of location reduce the first mobile station accordingly.
  • In a development of the present invention, the Distances from more than two mobile stations to the first Mobile station determined. A corresponding increase in Measurements increases the accuracy of the position determination of the first Mobile station.
  • The signal of the present is preferred Invention for an emergency call. For emergency calls, accuracy can the position information can be increased significantly, resulting in a Significant reduction in the time until arrival of Rescue workers leads. Deliver procedures like GPS or OTDA at UMTS, e.g. B. by existing topographies in Metropolitan area, no position information or only with insufficient Accuracy is what makes the present invention special can be used advantageously for emergency calls. Beyond that all approved in the United States Radio communication systems determine a location at a Allow emergency calls with accuracy requirements are constantly tightened.
  • The task at the beginning is also a Positioning system with means for first determining a Position of a first, second and third mobile station and Means for transmitting a signal from the first mobile station solved to the second and third mobile station. Based on the Determining the distances between the first Mobile station and the second and third mobile station takes place second position determination of the first mobile station.
  • The present invention further relates to a Mobile station, in particular a mobile radio terminal, for use in a method according to the invention and / or for use in a position determination system according to the invention.
  • The invention is described below with reference to the attached drawings using exemplary embodiments explained. The features shown there and also those already Features described above can not only be mentioned in the Combinations, but also individually or in others Combinations be essential to the invention. Although the Embodiment refer to emergency signals, so is the present invention is not limited to an emergency call system. It demonstrate:
  • Figure 1 is a distribution of time slots in a time frame of 10 ms in a mobile radio system according to the UMTS-TDD standard.
  • Fig. 2 is a schematic illustration of a mobile radio cell comprising a base station and a plurality of mobile stations;
  • Fig. 3 is a flow diagram illustrating the determination of the transit time difference;
  • Fig. 4 is a schematic representation of three mobile stations; and
  • Fig. 5 is a schematic representation of several cells of a mobile radio system.
  • Fig. 1 shows a distribution of 15 time slots (TS # 0 to TS # 14) over a time frame of 10 ms in a mobile radio system according to the UMTS-TDD standard. As shown schematically in FIG. 1 by an arrow pointing downward, the first 11 time slots (TS # 0 to TS # 10) are for transmission in the downlink direction, and the last four time slots (TS # 11 to TS # 14 ) reserved for the uplink transmission, as shown by the up arrow. In the exemplary embodiment, this configuration is repeated in each of the temporally successive frames.
  • Fig. 2 shows an example of a distribution of several mobile stations MS1, MS2, MS3, MS10, MS11 and MS12 in a cell, in the middle of which there is a base station BS. The cell is part of a complete cellular network, which works according to the UMTS-TDD mode. This means that the cell shown is surrounded by further UMTS-TDD cells, as is shown, for example, in FIG. 5.
  • The mobile stations MS1, MS2, MS3, MS10, MS11 and MS12 determine, e.g. B. for navigation applications, in regular Intervals using the OTDOA method. To the mobile station sends in MS1 at a certain point in time Emergency signal off and at the same time there is another one Determination of the position of MS1, which also corresponds to the Base station BS is sent. The actual calculation of the Position takes place in the network of the mobile radio system (not ) Shown. Thus the mobile stations only transmit the measured time differences of the signals by different Base stations are sent.
  • The approximate location of all mobile stations in the network is known from the determination, for example using the OTDA method. The network then determines the mobile stations which are in a specific radius r around MS1. In the exemplary embodiment shown in FIG. 2, the mobile stations MS2 and MS3 are involved. By signaling the network, the mobile station MS1 is now instructed to send a specific emergency call position signal, for example, in the time slot TS # 10 of the next frame. The emergency call position signal, which the mobile station MS1 emits for the purpose of additional position determination, can be either a so-called random access burst, ie a direct access, or any sequence with properties that enable simple and reliable detection , of the duration of a time slot. The time slot for the emergency call position signal is intended for downlink transmissions during normal operation. During an emergency call, the triggering mobile station is instructed to send in this emergency call slot. In order to avoid interference, the base station BS stops all transmissions in this emergency time slot. Also by signaling the network, the mobile stations MS2 and MS3 are instructed to detect the signals emitted by the mobile station MS1 and to report the arrival times Δt1 and Δt3 back to the base station BS relative to their own individual time information.
  • As shown in FIG. 2, the distance between the mobile stations MS1, MS2 and MS3 from the base station is r1, r2 and r3. A signal which is transmitted by the base station BS consequently requires the time intervals t1, t2 and t3 to reach the mobile stations. In a first approximation, there is the following relationship between t and r:

    r = ct (1)
  • Where c is the speed of light. The times t1, t2 and t3 are known in the mobile radio system. Due to the The timeslot structure and the code properties must match those of different mobile stations in the same time slots sent data arrive at the base station BS at the same time. To achieve this, the mobile stations that are in the same time slot in the uplink, too start the transmission at different times because the Distance from the base station BS also the runtime of the Signal increases.
  • In the present embodiment, the P-CCPCH channel used as a synchronization signal. The P-CCPCH signal is transmitted in the time slot TS # 0 by the base station BS and the individual mobile stations MS synchronize thereon. So that the uplink transmission takes place synchronously, Methods exist with which one for each mobile station MS Change in time amount, a so-called timing advance (TA), is determined. For example, if the mobile station MS2 in Time slot TS # 12 transmitted in the uplink direction, so it must Send the timing advance amount TA1 earlier than that Time of the beginning of the time slot TS # 12 according to the own time control. 2.t1 = TA1 applies.
  • The uplink transmission of the emergency signal from the mobile station MS1 is done without timing advance. By determining the Time difference Δt21 between the arrival of the emergency call position Signal at the mobile station MS2 and the beginning of a frame Δt1 can be calculated at the mobile station MS2. This is the time the emergency position signal from the Mobile station MS1 to the mobile station MS2 is required.
  • FIG. 3 shows the time sequence when determining the transit time difference. At the absolute time t0, the base station BS sends a synchronization signal in the P-CCPCH channel. This arrives at the mobile station MS1 at the time t1. At this time MS1 sends the emergency call signal, which arrives at the mobile station MS2 at time t2. The mobile station MS2 now determines the time difference Δt21 until the arrival of the P-CCPCH at the mobile station MS2. The time difference Δt1 is:

    Δt1 = t3 - t1 - Δt12 (2)
  • The network therefore knows the position of all relevant mobile stations. The mobile station MS1 sends an emergency call signal and with a special emergency call position signal transmitted by MS1, the network determines the distances Δr2 and Δr3 of the surrounding mobile stations MS2 and MS3 from MS1. Fig. 4 is a corresponding schematic illustration showing the three mobile stations MS1, MS2 and MS3. With the available data, two circles K2 and K3 are defined, with the center points MS2 and MS3 and the radii Δr2 and Δr3. According to the geometric conditions, the mobile station MS1 must be at the intersection of the circles K2 and K3. Due to the already known position of MS1, possible multiple solutions for the intersection of two circles are excluded. There is thus a further position information about the location of the mobile station MS1. The position information can either be used to confirm the original position or to increase the accuracy of position information. It is also conceivable that the additional position data are taken into account in the algorithm for determining the position of the mobile station MS1 in the OTDOA measurements of the surrounding base stations.
  • The same applies in a second exemplary embodiment Requirements as in the first embodiment. It will however, assumed that the mobile station MS1 is not the Possibility to determine the position. Either are not the necessary measurement routines in the terminal implemented or due to fading may not be enough Beacon signals from surrounding base stations are received, so that no clear position can be determined. In such a case, a position determination can either solely from the evaluation of the intersections of the circles or through a combination of the incomplete properties Position determination of the mobile station MS1 and the Intersections of the circles are made. In a further training of the second Embodiment is assumed that the Mobile station MS3 additionally has a GPS receiver. Out for this reason, the location of the mobile station MS3 is relative exactly, the location of the mobile station MS1 based on MS3 is still defined by a circle. The However, the circle shows less inaccuracy with regard to the Center, compared to the determination of the Center of the circle according to the OTDOA method by the mobile station MS3, on. As a result, the inaccuracy of the Position determination of the mobile station MS1.
  • In a third embodiment, the same requirements apply as in the first embodiment. In addition, the mobile stations MS4 to MS6 are considered. The mobile station MS5 sends an emergency call in an uplink time slot TS # 11 at an absolute time t5. The other two mobile stations MS4 and MS6 were configured so that their normal uplink transmissions take place in time slots TS # 12 and TS # 13, respectively. The additional task of the mobile stations MS4 and MS6 is now to search in certain uplink time slots for emergency calls which are sent out by other stations. The network signals that emergency calls can be transmitted in any uplink time slot not used by them and / or in a defined uplink time slot. The mobile stations MS4 and MS6 then determine that an emergency call arrives at their own specified time offset by Δt4 or Δt6. According to the explanations in the first exemplary embodiment and the explanations for the flowchart according to FIG. 3, the distance between the mobile stations MS4 and MS6 and the mobile station MS5 is known in the network and an improvement in the position determination is possible. The difference compared to the exemplary embodiments explained above is that in this exemplary embodiment no additional emergency call position signal is transmitted by the mobile station MS5. Only the original emergency call is used for the time measurements.
  • In another embodiment, the additional Emergency call position signal not from the one to be determined Mobile station, but from the surrounding mobile stations themselves sent out. The mobile station MS1 sends the emergency call in Time slot TS # 11. By signaling the network the mobile stations MS2 and MS3 instructed one each Different emergency call position signal in the uplink time slot TS # 12 or in the downlink time slot TS # 10. The Mobile station MS1 now measures the relative arrival time of this Signals and transmits them to the network, so as with the previous embodiments Position determination can be made or improved.
  • In a further exemplary embodiment, the systems of the previous exemplary embodiments are expanded in such a way that the number of mobile stations involved is increased. In FIG. 5, three cells of a mobile radio network with three base stations BS1, BS2 and BS3 and the mobile stations MS5, MS6, MS7, MS8 and MS9 shown. The mobile station MS5 sends an emergency call and its positions are to be determined or specified. Since only the mobile station MS6 is in the same cell in which the mobile station MS5 is located or is close enough to the mobile station MS5, further mobile stations MS7, MS8 and MS9 from the neighboring cells are used to determine the time difference measurements. It is also conceivable to use mobile stations from more distant cells. The time difference is then determined as already explained above.
  • It is also possible that the distance regulations are not via runtime measurements. So it can Receiving field strength (power) of a transmitted signal when the signal is known Transmission power can be measured. About the known The equation of propagation of the signals and location-specific factors can Radius on which the searched mobile station is located be determined. Combinations of time and Field strength measurements are also conceivable. This can be done apply accordingly in all embodiments. Combinations of the exemplary embodiments are also conceivable.
  • With multimode terminals, i. H. End devices that at different transmission frequencies can be used, it is conceivable that the process described above in other Cellular networks repeated or with provisions in others Cellular networks are combined. This can reduce accuracy the position determination can be further increased.
  • For transmission methods based on the FDD mode it is conceivable that the mobile station making the emergency call sent the call, receives permission from the base station to send in its receive (RX) band for localization. Other mobile stations can then receive and evaluate. Conversely, mobile stations that are nearby the mobile station to be located, on the receiving Send frequencies that the mobile station to be located detected.
  • The present invention solves the problem of Positioning in a radio communication system when others Procedures such as GPS or OTDA with UMTS no position information or Provide position information with insufficient accuracy.

Claims (19)

1. Method for determining the position in a mobile radio system, comprising the method steps:
- First determining a position of a first (MS1) second (MS2) and third (MS3) mobile station;
- Sending a signal from the first mobile station (MS1) to the second (MS2) and third (MS3) mobile station;
characterized in that
on the basis of the determination of the distances between the first mobile station (MS1) and the second (MS2) and third (MS3) mobile station, a second position determination of the first mobile station (MS1) is carried out.
2. The method according to claim 1, characterized in that all mobile stations are determined that are in one Radius (r) around the first mobile station (MS1).
3. The method according to claim 2, characterized in that the distances by measuring transit time differences below Consideration of a synchronized signal (P-CCPCH) be determined by the base station.
4. The method according to claim 3, characterized in that the synchronized signal is a beacon Channel.
5. The method according to any one of the preceding claims, characterized in that the second position determination of the first mobile station (MS1) over the two intersections of two circles with the Radii of the specified distances around the second or the third mobile station (MS2, MS3) takes place, one Selection of the two intersections based on the first Determination takes place.
6. The method according to any one of the preceding claims, characterized in that in addition to the signal a position signal from the first mobile station (MS1) and / or from a surrounding one Mobile station (MS2, MS3) is sent.
7. The method according to any one of the preceding claims, characterized in that the second mobile station (MS2) a position determination with the help of a GPS receiver.
8. The method according to any one of the preceding claims, characterized in that the distances of more than two mobile stations (MS2, MS3) to the first mobile station (MS1).
9. The method according to any one of the preceding claims, characterized in that the signal is an emergency call.
10. Positioning system, comprising:
Means for first determining a position of a first (MS1), second (MS2) and third (MS3) mobile station;
Means for transmitting a signal from the first mobile station (MS1) to the second (MS2) and third (MS3) mobile station;
characterized in that
on the basis of the determination of the distances between the first mobile station (MS1) and the second (MS2) and third (MS3) mobile station, a second position determination of the first mobile station (MS1) is carried out.
11. Positioning system according to claim 10, characterized in that all mobile stations are determined that are in one Radius (r) around the first mobile station (MS1).
12. Positioning system according to claim 11, characterized in that the distances by measuring transit time differences below Consideration of a synchronized signal (P-CCPCH) be determined by the base station.
13. Positioning system according to claim 12, characterized in that the synchronized signal is a beacon Channel.
14. Positioning system according to one of claims 10 to 13. characterized in that the second position determination of the first mobile station (MS1) over the two intersections of two circles with the Radii of the specified distances around the second or the third mobile station (MS2, MS3) takes place, one Selection of the two intersections based on the first Determination takes place.
15. Positioning system according to one of claims 10 up to 14 characterized in that in addition to the signal a position signal from the first mobile station (MS1) and / or from a surrounding one Mobile station (MS2, MS3) is sent.
16. Positioning system according to one of claims 10 to 15, characterized in that the second mobile station (MS2) a GPS receiver having.
17. Positioning system according to one of claims 10 up to 16. characterized in that the distances of more than two mobile stations (MS2, MS3) to the first mobile station (MS1).
18. Positioning system according to one of claims 10 to 17. characterized in that the signal is an emergency call.
19. Mobile station, in particular mobile radio terminal, for Use in a method according to one of claims 1 to 9 and / or for use in one Positioning system according to one of claims 10 to 18.
DE2002122140 2002-05-17 2002-05-17 Determination of the position of a mobile telephone uses time sequence transmissions to a group of units within a defined are that defines position Withdrawn DE10222140A1 (en)

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PCT/DE2003/001495 WO2003098953A1 (en) 2002-05-17 2003-05-09 Method and device for determining a position in a mobile radio system

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DE10357479A1 (en) * 2003-12-09 2005-07-14 Siemens Ag Mobile station location procedure for radio communication networks monitors signal between it and both other mobiles and base stations
DE102006056338A1 (en) * 2006-11-29 2008-06-05 Rohde & Schwarz Gmbh & Co. Kg Method and device for determining the position of a terminal in a mobile radio network
EP2211582A1 (en) * 2009-01-23 2010-07-28 Deutsches Zentrum für Luft- und Raumfahrt e.V. Method for determining the position of a mobile terminal
EP2205031A3 (en) * 2008-12-30 2011-11-16 LG-Ericsson Co., Ltd. Method for uplink communication in mobile communication environment
DE112004002467B4 (en) * 2003-12-19 2015-04-09 Motorola Mobility, Inc. ( N.D. Ges. D. Staates Delaware ) Method and device for locating a remote unit
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