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WO2016122860A1 - Procédé et appareil permettant d'obtenir une différence de temps d'arrivée lors d'une localisation de mobiles - Google Patents

Procédé et appareil permettant d'obtenir une différence de temps d'arrivée lors d'une localisation de mobiles Download PDF

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Publication number
WO2016122860A1
WO2016122860A1 PCT/US2016/012871 US2016012871W WO2016122860A1 WO 2016122860 A1 WO2016122860 A1 WO 2016122860A1 US 2016012871 W US2016012871 W US 2016012871W WO 2016122860 A1 WO2016122860 A1 WO 2016122860A1
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Prior art keywords
enbs
enb
network
arrival times
arrival time
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PCT/US2016/012871
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English (en)
Inventor
Wenfeng Zhang
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ZTE Corp
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ZTE Corp
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-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
    • G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO 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
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-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
    • G01S5/0205—Details
    • G01S5/0236—Assistance data, e.g. base station almanac

Definitions

  • the present application relates to mobile positioning and, in particular to, method apparatus to obtain the time difference of arrival (TDOA) measurement used in mobile positioning.
  • the present application has a specific application but not limited to the mobile positioning in 3GPP Long Term Evolution (LTE) system that is one of the candidates for the 4-th generation wireless system.
  • LTE Long Term Evolution
  • LCS location based services
  • TDOA time-difference-of-arrival
  • the network configures the mobile terminal, or so-called “user equipment” (UE), to measure the positioning signals transmitted by one reference base station, or so-called “reference eNB", and a number of neighboring base stations (i.e. neighboring eNB), where the reference eNB and the neighboring eNBs are synchronized with each other regarding the transmission of positioning signals.
  • UE user equipment
  • reference eNB a number of neighboring base stations
  • neighboring eNB i.e. neighboring eNB
  • the UE measures those positioning signals transmitted by configured eNBs and detects the arrival time ( ⁇ 0 ) of the positioning signal transmitted by the reference eNB and the arrival times ( ⁇ ,l ⁇ i ⁇ N) of positioning signals transmitted by N neighboring eNBs.
  • the arrival time ( ⁇ 1 ) for the neighboring eNB 1 is the earliest, followed by the arrival times for the reference eNB ( ⁇ 0 ) and other neighboring eNBs.
  • the UE further calculates the N arrival time differences between each arrival time ,l ⁇ i ⁇ N) of positioning signal coming from each of N neighboring eNBs and the arrival time ( ⁇ 0 ) of positioning signal coming from the reference eNB.
  • N arrival time differences (l ⁇ i ⁇ N), along with their correspondence to the N neighboring eNBs are reported to the network via serving eNB of the UE.
  • the network Given reported arrival time difference tj t(i , the network can assume the UE' s position is close to the joint locations of N hyperbolic curves (for two-dimensional positioning) or N hyperbolic surfaces (for three-dimensional positioning), each of which is determined by the location of i-th neighboring eNB, the location of reference eNB and the propagation distance difference ⁇ ⁇ assuming line-of-sight (LOS) propagation condition, where c is the speed of light. Therefore, the best estimated UE position is the one that has the least square of error distances to all N hyperbolic curves or surfaces.
  • LOS line-of-sight
  • the equation (2) is a typical linear optimization problem based on N linear equations, in terms of three unknown variables (x,y, P - P n ) (for 2D positioning) or four unknown variables (x, y, z, P - P n ) (for 3D positioning).
  • the mathematic solution for such optimization problem could be straight-forward, depending on whether the additional constraint between (x,y) or (x,y,z) and P -P. is taken into account.
  • equation (2) with the "square" operation applied on both side of equation (1), the equation (2) includes two cases for each index i:
  • the present application provides a new method for obtaining arrival time differences for TDOA-based mobile positioning, with the reference node to be determined on either user equipment side or network side.
  • a method for obtaining arrival time differences for TDOA based mobile positioning is performed by a network and a user equipment.
  • the method comprises the following steps: sending, by a network, configuration information to a user equipment (UE) to configure the UE with a first number of eNBs; upon receipt of the configuration information from the network, measuring and detecting, by the UE, arrival times of positioning signals transmitted from a second number of eNBs among the first number of eNBs; selecting, by the UE, one eNB among the second number of eNBs, wherein one of the selected eNBs corresponds to an earliest arrival time of positioning signal among the positioning signals transmitted by the second number of eNBs; and taking, by the UE, the selected eNB as a reference eNB and the others of the second number of eNBs as neighbouring eNBs, and calculating, by the UE, a third number of arrival time differences by subtracting the arrival time of the reference e
  • UE user equipment
  • a method for obtaining arrival time differences for TDOA based mobile positioning is performed by a network and a user equipment.
  • the method comprises the following steps: sending, by a network, configuration information to a user equipment (UE) to configure the UE with a first number of eNBs; upon receipt of the configuration information from the network, measuring and detecting, by the UE, arrival times of positioning signals transmitted from a second number of eNBs among a first number of configured eNBs; subtracting, by the UE, a common offset value from detected arrival times of the second number of eNBs to obtain a second number of adjusted arrival times; reporting, by the UE, to the network the second number of adjusted arrival times and their correspondences to the second number of eNBs for which the positioning signal arrival times are detected; upon receipt of the report from the UE, selecting, by the network, one eNB from the reported second number of eNBs, wherein the selected eNBs corresponds to an earliest adjusted
  • an apparatus for obtaining arrival time differences for TDOA based mobile positioning is configured to: send configuration information to a user equipment (UE) to configure the UE with a first number of eNBs; upon receipt of from the UE a report containing a second number of adjusted arrival times and a corresponding second number of eNBs, select one eNB from the second number of the reported eNBs, where the selected eNB corresponds to an earliest adjusted arrival time among the second number of reported adjusted arrival times; take the selected eNB as a reference eNB and the others of the second number of reported eNBs as neighbouring eNBs, and calculate a third number of arrival time differences by subtracting a reported adjusted arrival time of reference eNB from reported adjusted arrival times of the neighbouring eNBs.
  • UE user equipment
  • a method for obtaining arrival time differences for TDOA based mobile positioning is performed by a user equipment.
  • the method comprises the following steps: measuring and detecting, by a user equipment (UE), arrival times of positioning signals transmitted from a second number of eNBs among a first number of configured eNBs; subtracting, by the UE, a common offset value from the detected arrival times of the second number of eNBs to obtain a second number of adjusted arrival times; and reporting, by the UE, to a network the second number of adjusted arrival times and their correspondence to the second number of eNBs for which the positioning signal arrival times are detected.
  • UE user equipment
  • Figure 1 depicts an example of TDOA system involving eNBs and UE, as well as the arrival time schematic.
  • Figure 2 depicts the TDOA positioning performances on the horizontal 2D surface and elevation with and without the method of the present application.
  • Figure 3 depicts the TDOA procedure with reference eNB determined on the
  • Figure 4 depicts the TDOA procedure with reference eNB determined on the network side according to some embodiments of the present application.
  • the present application is directed to a method to minimize the impact of the above case-2 false condition by making at least one of the TDOA measurements to ) to be non-negative.
  • the method is designed for mobile positioning in 3GPP LTE system, the same principle can be used in other positioning system based on the TDOA technique.
  • Figure 2 shows positioning accuracy on both horizontal surface and elevation between the following two methods:
  • the reference eNB is selected to have the earliest arrival time so that the arrival time difference (TDOA) is always non-negative.
  • the reference eNB is randomly selected so that the arrival timing difference (TDOA) can be either positive or negative.
  • the positioning accuracy shown in Figure 2 is indicated by cumulative density function (CDF) curve, which represents the probability for the positioning error to be less than a specific distance value. For example, for a probability of 60%, the positioning error on horizontal surface is no larger than 35m if the reference eNB is selected to have earliest arrival time, and is above 55m if the reference eNB is randomly selected. Note that the method of reference eNB selection disclosed in the present application is more effective to improve the positioning performance.
  • the UE is assumed to measure and detect positioning signals transmitted from 10 eNBs, and the propagation paths between eNB and UE do not necessarily meet the line-of- sight condition.
  • the reference eNB can be determined by the UE after the UE detects the arrival times and before the UE position is estimated by applying equation (1) or (2).
  • the following steps focus on the application where the reference eNB is determined by the UE.
  • the current LTE standard also allows the UE to change the reference eNB differently from the one configured by the network.
  • the current LTE standard does not specify the criteria for such change on the UE side.
  • the steps performed in both network side and UE side to derive the arrival time differences and to use the derived arrival time differences for mobile positioning are shown in Figure 3 and given with details as following.
  • the network configures (310) the UE with a number (>N+1) of eNBs that are synchronized with each other in terms of transmission of positioning signals. According to this configuration, even though the network does not need to assign one specific eNB as reference eNB, it can inform the UE of certain restrictions on the selection of reference eNB.
  • restriction information can be the information indicating which of the configured eNBs can be or cannot be used by the UE as reference eNB.
  • Such indication information can be in the form of an indication flag attached to each configured eNB, where the indication flag can indicate, by either its existence or its value, whether the corresponding eNB can be used as a candidate in reference eNB selection.
  • the network can attach a flag or assign a specific flag value to each of a sub-group of configured eNBs, whose network node synchronization is not highly accurate, to prevent UE from selecting the reference eNB from those eNBs.
  • the network may also attach a flag or assign a specific flag value to each of a sub-group of eNBs, whose network node synchronization is highly accurate, to direct the UE to select reference eNB from these eNBs.
  • Network node synchronization accuracy is one exemplary criterion for the restriction signaling. Other criteria for the network to take into account are also possible and may be used in combination with the criterion above.
  • the UE Upon receipt of the configuration information from the network, the UE measures (320) the arrival times of positioning signals transmitted by the configured eNBs and detects the (N+l) arrival times, ⁇ (0 ⁇ /' ⁇ N ⁇ 0 f th e positioning signals transmitted by (N+l) configured eNBs.
  • the UE selects (330) one eNB among these (N+l) eNBs or a sub-group of these (N+l) eNBs, where the UE-selected eNB corresponds to the earliest (i.e. smallest) arrival time of positioning signal among those transmitted by these (N+l) eNBs or the subgroup of these N+l eNBs.
  • the sub-group of these (N+l) eNBs if applicable, is determined locally on the UE side by taking into account various information such as the quality of timing detection (signal-to-noise ratio, timing variance, etc.) and the restriction information configured by the network indicating which eNBs can be or cannot be used as reference eNB.
  • the UE takes (340) the selected eNB, whose index is assumed to be z ° (
  • the UE reports (350) to the network, via higher-layer signaling, the selection of reference eNB, the N TDOA arrival time differences and their correspondences to N neighboring eNBs.
  • the TDOA arrival time differences can be in quantization form; each of reference eNB and neighboring eNB is identified by the corresponding cell identification number of the eNB.
  • the network determines (360) the location of the UE based on the location of reported reference eNB, the locations of N reported neighboring eNBs and the N reported arrival time differences.
  • the algorithm used in the location determination can follow equation (1), equation (2) or other optimization principles.
  • the reference eNB can be determined by the network.
  • the network configures (410) the UE with a number (>N+1) of eNBs that are synchronized with each other in terms of transmission of positioning signals. According to this configuration, the network does not need to assign one specific eNB as reference eNB.
  • the UE Upon receipt of the configuration information from the network, the UE measures (420) the arrival times of positioning signals transmitted by the configured eNBs and detects the (N+l) arrival times, ⁇ ( 0 ⁇ /' ⁇ N ⁇ 0 f fa e positioning signals transmitted by N+l configured eNBs. [0033] The UE may subtract (430) a common offset value, toffset , from the (N+1) detected arrival times to obtain (N+1) adjusted arrival times, toffset (0 ⁇ /' ⁇ N ⁇ that are to be reported to the network. One purpose of this step is to reduce the number of digitized bits required to report the arrival time so as to save certain reporting overhead. One example to achieve this benefit is toffset m n ⁇ . The subtracted common offset value ( tqffset ) does not need to be known to the network and does not need to be the same for different UEs.
  • the UE reports (440) to the network, via higher-layer signaling, the (N+1) adjusted arrival times and their correspondences to the (N+1) eNBs for which the positioning signal arrival times are detected.
  • the adjusted arrival times can be in
  • each of the (N+1) eNB is identified by the corresponding cell
  • the UE can also include in the report other information that can be used by the network to assist the determination of reference eNB, such as the quality of timing detection (signal-to-noise ratio, timing variance, etc.).
  • the common offset value used to subtract the detected arrival times is the detected arrival time for a specific eNB, and such setting of common offset value is known to the network
  • the corresponding adjusted arrival time is deemed to be zero, such that UE may omit the adjusted arrival time for that specific eNB from the report, but still needs to inform in the report the identification of that specific eNB, if that information is not known by network.
  • the UE's report only contains N adjusted arrival times, but the network would know there is a (N+l)-th adjusted arrival time, though not reported, whose value is zero.
  • the network Upon receipt of the UE's report, which contains (N+1) adjusted arrival times and the corresponding (N+1) eNBs, the network selects (450) one eNB from these (N+1) eNBs or a sub-group of these (N+1) eNBs, where the selected eNB corresponds to the earliest (i.e., smallest) adjusted arrival time among those (N+1) adjusted arrival times or the subgroup of those (N+1) adjusted arrival times.
  • the sub-group if applicable, is determined on the network side, by taking into account various information such as the reported quality of timing detection (signal-to-noise ratio, timing variance, etc.) and the information such as which eNB can be or cannot be used as reference eNB.
  • the network If the network knows that the common offset value used by UE to subtract the detected arrival times to obtain adjusted arrival times is equal to the detected arrival value for a specific eNB, and the report received by the network contains only N adjusted arrival times, the network adds the (N+l)-th adjusted arrival time whose value is zero and uses all of the (N+1) adjusted arrival times to select reference eNB as mentioned above.
  • the network takes (460) the selected eNB, whose index is assumed to be z ° (
  • the network determines (470) the location of the UE based on the location of the determined reference eNB, the locations of N determined neighboring eNBs and the N TDOA arrival time differences.
  • the algorithm used in location determination can follow equation (1), equation (2) or other optimization principles.
  • TDOA-based mobile positioning requires that the reference eNB and neighboring eNBs are synchronized with each other in terms of transmission of positioning signals.
  • the condition of "synchronized" refers to both of following cases:
  • the eNBs transmit the positioning signals at either the same or different time
  • the synchronization differences are either zero or non-zero.
  • these synchronization differences if non-zero, are known to the network.
  • the known synchronization difference between the i-th neighboring eNB and reference eNB can be compensated in the TDOA algorithm by subtracting the synchronization difference from the measured arrival time difference ( t, - 1 0 ) associated with i-th neighboring eNB and reference eNB. Therefore, the two eNBs, whose positioning signal transmission timings are not aligned with each other, are still considered satisfying the "synchronized" condition if the time difference between the positioning signal transmission timings is known to the network.
  • the positioning nodes on the network side are called “reference eNB” and “neighboring eNB”. Note that the positioning nodes may also be named as “reference cell” and “neighboring cell” in some other embodiments.
  • the operations depicted in Figure 3 and Figure 4 on the network side can be implemented in one or multiple apparatuses or modules in one or multiple network nodes.
  • the operations shown in Figure 3 and Figure 4 on the UE side can be implemented in one or multiple apparatuses or modules in one UE.
  • the above described methods and their variations may be implemented as computer software or firmware instructions. Such instructions may be stored in an article with one or more machine-readable storage devices connected to one or more computers or integrated circuits or digital processors such as digital signal processors and microprocessors.
  • the claimed method and related operation process may be implemented in form of software instructions or firmware instructions for execution by a processor in the transmitter and receiver or the transmission and reception controller. In operation, the instructions are executed by one or more processors to cause the transmitter and receiver or the transmission and reception controller to perform the described functions and operations.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un nouveau procédé permettant d'obtenir des différences de temps d'arrivée pour la localisation de mobiles en se basant sur une différence de temps d'arrivée (TDOA pour Time Difference Of Arrival), le nœud de référence devant être déterminé soit côté équipement utilisateur, soit côté réseau. Selon certains modes de réalisation, un nœud B évolué (eNB pour evolved B Node) est sélectionné, parmi un second nombre de nœuds eNB ou un sous-groupe du second nombre de nœuds eNB, lorsque le nœud eNB sélectionné correspond au temps d'arrivée le plus tôt du signal de localisation parmi les signaux de localisation transmis par le second nombre de nœuds eNB ou le sous-groupe du second nombre de nœuds eNB. Selon certains modes de réalisation, une valeur de décalage commune est soustraite du second nombre de temps d'arrivée détectés afin d'obtenir le second nombre de temps d'arrivée ajustés et le second nombre de temps d'arrivée ajustés est ensuite transmis au côté réseau afin de déterminer la position actuelle de l'équipement utilisateur.
PCT/US2016/012871 2015-01-29 2016-01-11 Procédé et appareil permettant d'obtenir une différence de temps d'arrivée lors d'une localisation de mobiles Ceased WO2016122860A1 (fr)

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US62/109,437 2015-01-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109068344A (zh) * 2018-08-24 2018-12-21 深圳市翌日科技有限公司 一种简单的tdoa定位基站选择策略
US20230228834A1 (en) * 2020-08-04 2023-07-20 Qualcomm Incorporated Location support for a wireless aerial mobile device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040264407A1 (en) * 2002-01-24 2004-12-30 Jin Tang Method of locating and measuring a mobile station
US20100317343A1 (en) * 2009-06-12 2010-12-16 Motorola, Inc. Interference Control, SINR Optimization and Signaling Enhancements to Improve the Performance of OTDOA Measurements
US20110176483A1 (en) * 2009-07-23 2011-07-21 Ravi Palanki Synchronization of devices in a wireless communication network
US20120165012A1 (en) * 2010-07-01 2012-06-28 Qualcomm Incorporated Determination of positions of wireless transceivers to be added to a wireless communication network
US20150018010A1 (en) * 2013-07-12 2015-01-15 Qualcomm Incorporated Providing otdoa prs assistance data

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040264407A1 (en) * 2002-01-24 2004-12-30 Jin Tang Method of locating and measuring a mobile station
US20100317343A1 (en) * 2009-06-12 2010-12-16 Motorola, Inc. Interference Control, SINR Optimization and Signaling Enhancements to Improve the Performance of OTDOA Measurements
US20110176483A1 (en) * 2009-07-23 2011-07-21 Ravi Palanki Synchronization of devices in a wireless communication network
US20120165012A1 (en) * 2010-07-01 2012-06-28 Qualcomm Incorporated Determination of positions of wireless transceivers to be added to a wireless communication network
US20150018010A1 (en) * 2013-07-12 2015-01-15 Qualcomm Incorporated Providing otdoa prs assistance data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109068344A (zh) * 2018-08-24 2018-12-21 深圳市翌日科技有限公司 一种简单的tdoa定位基站选择策略
US20230228834A1 (en) * 2020-08-04 2023-07-20 Qualcomm Incorporated Location support for a wireless aerial mobile device

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