WO2013044853A1 - 采用观察的到达时间差对移动台进行定位的方法及设备 - Google Patents

采用观察的到达时间差对移动台进行定位的方法及设备 Download PDF

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Publication number
WO2013044853A1
WO2013044853A1 PCT/CN2012/082332 CN2012082332W WO2013044853A1 WO 2013044853 A1 WO2013044853 A1 WO 2013044853A1 CN 2012082332 W CN2012082332 W CN 2012082332W WO 2013044853 A1 WO2013044853 A1 WO 2013044853A1
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WO
WIPO (PCT)
Prior art keywords
mobile station
communication system
positioning
supported
0td0a
Prior art date
Application number
PCT/CN2012/082332
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English (en)
French (fr)
Inventor
肖登坤
崔杰
杜元锋
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12836447.8A priority Critical patent/EP2763478B1/en
Publication of WO2013044853A1 publication Critical patent/WO2013044853A1/zh
Priority to US14/229,417 priority patent/US9229094B2/en
Priority to US14/944,740 priority patent/US9572127B2/en

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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
    • 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
    • G01S5/0009—Transmission of position information to remote stations
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present invention relates to a mobile station positioning technology, and more particularly to a method for positioning a mobile station by using a time difference of arrival observed, a positioning server, and a mobile station.
  • the positioning technology is a technology for determining the geographical position of the mobile station, and specifically uses the resources of the wireless communication network to directly or indirectly obtain the location information of the mobile station.
  • GNSS positioning There are three standard UE positioning methods used in existing communication systems: network-assisted GNSS positioning, downlink positioning, and e-CID positioning.
  • the characteristic parameters of the radio wave propagation signal between the mobile station and the base station such as the signal field strength, the propagation signal arrival time difference, the signal arrival direction angle, etc., are generally detected first, and then the corresponding positioning formula is used. Estimating the geometric position of the mobile station (for the detection of field strength and arrival time is the mobile station as the measurement subject, the estimation of the signal arrival direction angle is based on the base station as the measurement subject)
  • Downlink positioning belongs to network positioning, mainly relies on the detection of wireless resource characteristic parameters inside the mobile communication system, and then estimates the location of the mobile station according to the corresponding positioning formula.
  • the OTDOA positioning method belongs to one of downlink positioning, and uses a mobile station to receive downlink positioning reference signals from multiple base stations in a single communication system, and performs timing measurement to determine the network.
  • the bit server reports the PRS arrival time difference between the base stations, and the network positioning server calculates according to the received PRS arrival time difference between the base stations, and obtains the geographical position of the mobile station.
  • OTDOA uses a PRS arrival time difference between base stations of a single system for positioning, resulting in low positioning accuracy.
  • the embodiment of the invention provides a method and a device for positioning a mobile station by using an observed time difference of arrival to improve the positioning accuracy of the OTDOA.
  • An embodiment of the present invention provides a method for locating a mobile station by using a time difference of arrival observed, including:
  • OTDOA capability request message Sending an observed time difference difference OTDOA capability request message to the mobile station to query the communication system format supported by the mobile station and the signal reception quality information of each base station of the supported communication system, where the OTDOA capability request message includes the mobile station a plurality of communication system formats and corresponding signal reception quality information existing in the current service area, for the mobile station to select according to a communication system format supported by the mobile station;
  • OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal reception quality; according to a communication system format supported by the mobile station and a corresponding signal Receive quality, and send positioning assistance information to the mobile station, so that the mobile station reports the corresponding measurement result according to the positioning assistance information;
  • the mobile station is positioned using the measurement results.
  • the embodiment of the present invention further provides a method for locating a mobile station by using an observed time difference of arrival, including:
  • OTDOA capability request message includes multiple communication system standards and corresponding signal reception quality information existing in the current service area of the mobile station; Selecting, by the plurality of communication system formats, a communication system format supported by the mobile station; sending an OTDOA support capability message to the positioning server, where the OTDOA support capability message includes a communication system format supported by the mobile station and corresponding The signal receiving quality; receiving the positioning assistance information sent by the positioning server;
  • the embodiment of the present invention further provides a positioning server for positioning a mobile station by using an observed time difference of arrival, including:
  • a capability query module configured to send an observed time difference difference OTDOA capability request message to the mobile station, to query a communication system format supported by the mobile station and signal reception quality information of each base station of the supported communication system, the OTDOA capability request message And including, in the current service area of the mobile station, a plurality of communication system standards and corresponding signal reception quality information, where the mobile station selects according to a communication system format supported by the mobile station;
  • a capability receiving module configured to receive an OTDOA support capability message returned by the mobile station, where the OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal receiving quality;
  • the auxiliary information sending module is configured to send positioning auxiliary information to the mobile station according to the communication system standard supported by the mobile station and the corresponding signal receiving quality, so that the mobile station is configured according to the positioning auxiliary information. ⁇ corresponding measurement results;
  • a positioning module configured to locate the mobile station by using the measurement result.
  • the embodiment of the present invention further provides a mobile station that performs positioning by using the observed time difference of arrival, and includes:
  • the capability query receiving module is configured to receive an observed time difference difference OTDOA capability request message sent by the positioning server, where the OTDOA capability request message includes multiple communication system standards and corresponding signal reception quality information existing in the current service area of the mobile station. ;
  • a system standard selection module configured to select the mobile station from the plurality of communication system formats Supported communication system standards
  • the capability reporting module is configured to send an OTDOA support capability message to the positioning server, where the OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal receiving quality;
  • the auxiliary information receiving module is configured to receive the positioning assistance information sent by the positioning server, and the measurement result reporting module is configured to report the corresponding measurement result according to the positioning auxiliary information, so that the positioning server uses the measurement result to The mobile station is positioned.
  • the method and device for locating a mobile station by using a time difference of arrival observed by an embodiment of the present invention transmitting, by a positioning server, a mobile communication system to a mobile station to query a communication system supported by the mobile station and each base station of the supported communication system
  • the signal receives the quality information, and sends the positioning assistance information to the mobile station according to the communication system standard and the corresponding signal receiving quality supported by the mobile station, so that the mobile station reports the corresponding measurement result according to the positioning assistance information
  • the positioning server performs positioning based on the measurement results, which improves the TODOA positioning accuracy.
  • FIG. 1 is a flowchart of a method for positioning a mobile station by using a time difference of arrival observed by an embodiment according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of positioning of a prior art OTDOA
  • Figure 3a is a schematic diagram of a prior art single system topology
  • 3b is a schematic diagram of a topology of a prior art multi-communication system
  • FIG. 4 is a flowchart of another method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention
  • FIG. 5 is a flowchart of still another method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention
  • FIG. 4 is a flowchart of another method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention
  • FIG. 5 is a flowchart of still another method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention
  • FIG. 6 is a signaling interaction diagram corresponding to the embodiment shown in FIG. 5;
  • FIG. 7 is a schematic diagram of the cumulative probability of the SNR value of the average received PRS on the mobile station side obtained by the method for locating the mobile station by using the observed time difference of arrival according to the embodiment of the present invention
  • FIG. 8 is a schematic diagram of the SNR provided by the embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of a mobile station that performs positioning by using an observed time difference of arrival according to an embodiment of the present invention. Mode for carrying out the invention
  • LTE Long Term Evolution
  • GSM Global System for Mobile communications
  • WCDMA Wideband Code Division Multiple Access
  • other systems exist in the current service area of a mobile station, and UEs supporting multimode will also exist in large numbers.
  • FIG. 1 is a flowchart of a method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention.
  • the positioning method is described from the positioning server side.
  • the method for positioning the mobile station by using OTDOA includes:
  • Step 11 Send an observed time difference difference OTDOA capability request message to the mobile station, to query the communication system format supported by the mobile station and the signal reception quality information of each base station of the supported communication system, where the OTDOA capability request message includes Determining a plurality of communication system formats and corresponding signal reception quality information existing in a current service area of the mobile station, for the mobile station root Selecting according to the communication system format supported by the mobile station;
  • Step 12 Receive an OTDOA support capability message returned by the mobile station, where the OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal reception quality.
  • Step 13 Send positioning assistance information to the mobile station according to the communication system format supported by the mobile station and the corresponding signal receiving quality, so that the mobile station reports the corresponding measurement result according to the positioning assistance information;
  • Step 14 Locating the mobile station by using the measurement result.
  • the positioning server needs to determine which base station of which system the mobile station performs RSTD measurement based on the obtained information. For example, when using an existing communication system, as required by the LTE protocol TS36.133, each mobile station needs to measure at least 16 cells, and the mobile station has different reception quality for each base station of each system, if The RSTD measurement on the existing communication system cell with poor signal quality may cause the mobile station to fail to correctly receive the PRS or correctly estimate the arrival time of the first path, and report the inaccurate RSTD to the positioning server e-SMLC. Amplification of positioning error, low positioning accuracy.
  • the mobile station when performing positioning initialization, the mobile station should report to the positioning server based on its measurement the signal system quality supported by the base station and the various base stations in various communication systems, including the RSRP and RSRQ of the EUTRA base station, and the RSSI of the UTRA base station. RSCP, RSSI of GSM base station, etc.
  • the positioning server can select a suitable base station for positioning based on the signal receiving quality information of each base station in the various systems reported by the mobile station, thereby ensuring better positioning reference signal receiving quality and positioning accuracy.
  • the principle is that when there are three or more base stations in the UTRAN system, the network positioning server can determine the location of the mobile station according to the arrival time difference of the downlink transmission signals of different base stations.
  • the downlink transmission signal may be a reference signal or a synchronization signal.
  • a point where the difference between the two fixed point distances is a constant value constitutes a hyperbola.
  • base station 1 and base station 2 in the UTRAN system the distance from the base station 0 to the base station 1 The difference is ⁇ _ rf .
  • a hyperbola is formed, and the difference between the distance between the base station 1 and the base station 2 is "2 - a", which constitutes another hyperbola, and the intersection of the two hyperbola is the position of the mobile station.
  • the number of base stations existing in the UTRAN system is larger, The more precise the position of the mobile station is determined, that is, the higher the positioning accuracy of the mobile station.
  • OTDOA positioning is a technique for network-assisted mobile station positioning.
  • the network-side positioning server e-SMLC interacts with the base station to learn that the mobile station specifies the transmission and reception configuration of the Positioning Reference Signal (PRS), the base station transmits the PRS downlink, and the mobile station receives the PRS from each base station and identifies
  • the first path of each PRS is obtained, and the PRS arrival time difference between the base stations is obtained, and the obtained PRS arrival time difference between the respective base stations is reported to the e-SMLC.
  • the e-SMLC maps the received PRS arrival time difference between each base station into a distance difference between the mobile station and each base station, and calculates the exact position of the mobile station by using the hyperbolic model math shown in FIG.
  • the present embodiment uses the network positioning server according to different communication systems.
  • the distribution of base stations reasonable selection of base stations with good signal reception quality for RSTD measurement, can obtain more accurate measurement values of multiple cells, effectively avoiding the failure to correctly receive PRS due to poor signal reception quality or failing to correctly estimate the first path.
  • the arrival time and the like increase the positioning accuracy of the OTDOA.
  • selecting 16 positioning measurement cells may require selecting a base station farther from the mobile station, as shown in FIG. 3a.
  • the range indicated by the dashed line so the positioning reference signal quality may be poor.
  • the coverage of the first LTE LTE base station is in the range indicated by the black dotted line in FIG. 3b, and when there are base stations such as GSM and WCDMA, such as The rectangles of the different grayscale backgrounds shown in Figure 3b represent the base stations of different communication systems.
  • Base stations such as GSM and WCDMA can participate in positioning as candidate base stations, so that it is not necessary to select an LTE base station that is far away from the mobile station to participate in positioning, and the signal for estimating the time difference of the downlink transmission signal is improved. Receive quality, which improves positioning accuracy.
  • FIG. 4 is a flowchart of another method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention.
  • the positioning method is described from the mobile station side.
  • the method for positioning the mobile station by using the OTDOA includes:
  • Step 41 Receive an observed time difference of arrival OTDOA capability request message sent by the positioning server, where the OTDOA capability request message includes multiple communication system standards and corresponding signal reception quality information existing in the current service area of the mobile station;
  • Step 42 Select, from the plurality of communication system formats, a communication system supported by the mobile station;
  • Step 43 Send an OTDOA support capability message to the positioning server, where the OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal receiving quality.
  • Step 44 Receive positioning assistance information delivered by the positioning server.
  • Step 45 Report the corresponding measurement result according to the positioning assistance information, so that the positioning server uses the measurement result to locate the mobile station.
  • the method further includes:
  • the method further includes:
  • Determining whether the mobile station supports multimode if the mobile station supports multimode, the process of selecting the communication system format supported by the mobile station from the plurality of communication system formats, including: Selecting a plurality of communication system formats supported by the mobile station in a communication system format; otherwise, selecting a communication system format supported by the mobile station from the plurality of communication system formats
  • the process includes: selecting a communication system format supported by the mobile station from the plurality of communication system formats.
  • FIG. 5 is a flowchart of still another method for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention.
  • This embodiment is based on the RRC-Connected mobile station status, and the activation of the mobile station has been completed before the flow of this process.
  • the signaling protocols involved in the positioning method mainly include LPP (signaling interaction between the positioning server and the mobile station, 3GPP Technical Specification 36.355TS36.355), LPPa (signaling interaction between the positioning server and the base station, TS36.455).
  • FIG. 6 is a signaling interaction diagram corresponding to the embodiment shown in FIG. 5.
  • the method for positioning the mobile station by using OTDOA includes:
  • Step 51 The mobility management entity (Mobile Management Entity, ⁇ ) initiates a positioning request for locating a mobile station to the positioning server.
  • Mobile Management Entity Mobile Management Entity, ⁇
  • Step 52 The positioning server asks the mobile station whether to support OTDOA positioning and OTDOA positioning capability.
  • the positioning server sends an "OTDOA-RequestCapablities" to the mobile station, asking whether the UE supports the OTDOA positioning and the OTDOA positioning capability, including the newly added communication system standard supported by the inquiring mobile station, and various The signal receiving quality information of each base station of the system, such as RSRP and RSRQ of the E-UTRA base station, RSSI and RSCP of the UTRA base station, RSSI of the GSM base station, and the like.
  • the positioning server sends an "OTDOA INFORMATION REQUEST" to the eNB/NB/BTS to inquire about the eNB/NB/BTS information about the OTDOA location; the eNB/NB/BTS only refers to the "OTDOA INFORMATION RESPONSE" to the location server, where The carrier frequency supported by the eNB/NB/BTS is included; to inform the positioning server, the identifier of the cell that the mobile station needs to receive the PRS, the frequency point, and the PRS configuration information of the cells.
  • Step 53 The mobile station determines whether it supports OTDOA positioning. If yes, perform step 54. Otherwise, go to step 58.
  • Step 54 The mobile station determines whether it supports multimode, and moves the mobile station supporting multimode.
  • the mobile station can measure the base stations of different communication systems; if yes, go to step 55, otherwise, go to step 56;
  • Step 55 The mobile station reports the capability of supporting its own multimode to the positioning server, and the signal receiving quality of the mobile station to each base station of each communication system.
  • the mobile station reports the OTDOA providing capability ("OTDOA-ProvideCapablities") including the multi-RTA information to the positioning server, including the OTDOA capability of the mobile station, and is supported by the newly added mobile station.
  • OTDOA-ProvideCapablities including the multi-RTA information
  • the communication system standard, and the signal reception quality information of each base station of each communication system such as RSRP and RSRQ of the EUTRA base station, RSSI and RSCP of the UTRA base station, RSSI of the GSM base station, and the like.
  • Step 56 The mobile station reports only the signal receiving quality of the mobile station to the E-UTRA base station to the positioning server. Specifically, as shown in FIG. 6, the mobile station reports "OTDOA-ProvideCapablities" to the positioning server, including the OTDOA capability of the mobile station, and the RSRP and RSRQ from the EUTRA base station.
  • Step 57 The positioning server sends the positioning assistance information, that is, the information reported by the base station when the positioning server interacts with the base station, to indicate that the mobile station selects the base station with good channel for the mobile station to perform the positioning service.
  • the positioning assistance information includes the identity, frequency, and PRS configuration information of the cells that the mobile station needs to receive the PRS.
  • the positioning server sends an "OTDOA-ProvideAssistanceData" to the mobile station to notify the mobile station to locate the auxiliary information.
  • Step 58 Use other positioning methods.
  • the positioning server can know the multiple communication systems supported by the mobile station by carrying multiple communication system standards and corresponding signal reception quality in the current server of the mobile station during interaction with the mobile station.
  • the signal reception quality from the respective base stations received by the mobile stations of the respective communication systems is also known.
  • the positioning server notifies the mobile station to perform RSTD measurement on the base station with the best signal quality according to the communication system supported by the mobile station, After the positioning calculation is performed according to the measurement result, the mobile station is positioned.
  • the following is an example of a mobile station supporting multimode and a mobile station not supporting multimode.
  • OTDOA further details the method of positioning the mobile station.
  • the process of performing OTDOA positioning on the mobile station includes:
  • the first step the mobile station initiates a "Location service request" to the MME;
  • Step 2 The MME transparently transmits to the positioning server
  • Step 3 The positioning server sends a "capability request" to the mobile station, and simultaneously queries the communication system format supported by the mobile station, and the signal reception quality information of each base station of each system.
  • the positioning server sends the OTDOA-RequestCapablities to the mobile station:
  • OTDOA-RequestCapabilities:: SEQUENCE
  • Step 4 The mobile station sends capability provide to the location server, responds to its own support for OTDOA positioning, and simultaneously supports the communication system standard supported by the mobile station, and various systems.
  • the signal reception quality information of the base station such as RSRP and RSRQ of the EUTRA base station, RSSI and RSCP of the UTRA base station, RSSI of the GSM base station, and the like.
  • the mobile station reports OTDOA-ProvideCapablities to the positioning server:
  • OTDOA-ProvideCapabilities SEQUENCE ⁇
  • This embodiment is applicable to a multi-mode mobile station supporting multiple modes to select an appropriate base station for OTDOA positioning.
  • the process of OTDOA positioning for the mobile station includes:
  • the first step the mobile station initiates a Location service request to the MME;
  • Step 2 The MME transparently transmits to the positioning server;
  • Step 3 The positioning server sends the capability request to the mobile station, and simultaneously queries the communication system format it supports, and the signal reception quality information of each base station of each system.
  • the positioning server sends the OTDOA-RequestCapablities to the mobile station:
  • OTDOA-RequestCapabilities:: SEQUENCE
  • Step 4 The mobile station sends capability provide to the positioning server, replies to its own support for OTDOA positioning, reports that it only supports the E-UTRA communication system, and the signal reception quality information of each base station of the E-UTRA, such as RSRP and RSRQ.
  • the UE reports OTDOA-ProvideCapablities to the positioning server:
  • OTDOA-ProvideCapabilities SEQUENCE ⁇
  • SupportedBandEUTRA SEQUENCE ⁇
  • the mobile station carries the OTDOA to the mobile station provided by the embodiment of the present invention by carrying the communication system supported by the mobile station and the signal receiving quality from the base stations of the communication system in the reported "OTDOA-ProvideCapablities".
  • the positioning method can also be applied to a single mode mobile station, which improves the flexibility of positioning.
  • the base station of the communication system supported by the mobile station is selected to obtain the communication system supported by the mobile station and the corresponding signal reception quality, and the base station of the communication system with the better PRS quality that can be received by the mobile station is sent to the mobile station to ensure the mobile station receives the PRS.
  • the quality of the mobile station is reduced.
  • the base station using the multi-communication system performs positioning measurement, and the average received SNR value on the mobile station side is significantly improved compared with the average SNR value using a single LTE network, and the positioning accuracy is directly improved due to the quality improvement of the PRS. .
  • FIG. 8 is a schematic structural diagram of a positioning server for positioning a mobile station by using an observed time difference of arrival according to an embodiment of the present invention.
  • the positioning server is configured to perform the method in the embodiment shown in FIG. 1, including:
  • the capability query module 81 is configured to send an observed time difference difference OTDOA capability request message to the mobile station to query the communication system supported by the mobile station and the supported communication system bases.
  • the capability receiving module 82 is configured to receive an OTDOA support capability message returned by the mobile station, where the OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal receiving quality;
  • the auxiliary information sending module 83 is configured to send positioning auxiliary information to the mobile station according to the communication system format supported by the mobile station and the corresponding signal receiving quality, so that the mobile station is configured according to the positioning auxiliary information. ⁇ corresponding measurement results;
  • the positioning module 84 is configured to position the mobile station using the measurement result.
  • FIG. 9 is a schematic structural diagram of a mobile station that performs positioning by using an observed time difference of arrival according to an embodiment of the present invention.
  • the mobile station is configured to perform the method of the embodiment shown in FIG. 4, including: a capability query receiving module 91, a system standard selection module 92, a capability reporting module 93, an auxiliary information receiving module 94, and a measurement result reporting module 95. .
  • the capability query receiving module 91 is configured to receive an observed time difference difference OTDOA capability request message sent by the positioning server, where the OTDOA capability request message includes multiple communication system standards and corresponding signal reception quality information existing in the current service area of the mobile station. ;
  • the system standard selection module 92 is configured to select a communication system format supported by the mobile station from the plurality of communication system formats;
  • the capability reporting module 93 is configured to send an OTDOA support capability message to the positioning server, where the OTDOA support capability message includes a communication system format supported by the mobile station and a corresponding signal receiving quality.
  • the auxiliary information receiving module 94 is configured to receive the positioning assistance information sent by the positioning server.
  • the measurement result reporting module 95 is configured to report the corresponding measurement result according to the positioning auxiliary information, so that the positioning server uses the measurement result to The mobile station is positioned.
  • the mobile station provided by the embodiment of the present invention for positioning by using the observed time difference of arrival is further included
  • the positioning mode determining module is configured to determine whether the mobile station supports OTDOA positioning before selecting the communication system format supported by the mobile station from the plurality of communication system formats; at this time, the system standard selection module Also for performing the selection of the communication system system supported by the mobile station from the plurality of communication system formats if the mobile station supports OTDOA positioning.
  • the mobile station for positioning by using the observed time difference of arrival may further include: a multi-mode judging module, configured to perform the method of using the plurality of communication systems if the mobile station supports OTDOA positioning Before selecting the communication system supported by the mobile station, determining whether the mobile station supports multimode; at this time, the system standard selection module is further configured to: if the mobile station supports multimode, from the multiple communications A plurality of communication system formats supported by the mobile station are selected in the system format; otherwise, a communication system format supported by the mobile station is selected from the plurality of communication system formats.
  • a multi-mode judging module configured to perform the method of using the plurality of communication systems if the mobile station supports OTDOA positioning Before selecting the communication system supported by the mobile station, determining whether the mobile station supports multimode; at this time, the system standard selection module is further configured to: if the mobile station supports multimode, from the multiple communications A plurality of communication system formats supported by the mobile station are selected in the system format; otherwise, a communication system format supported by the mobile station is selected from

Abstract

本发明涉及一种采用观察的到达时间差对移动台进行定位的方法及设备，方法包括：向移动台发送观察的到达时间差 OTDOA能力请求消息，以询问移动台支持的通信系统制式及所支持的通信系统各基站的信号接收质量信息，OTDOA能力请求消息中包含移动台的当前服务区中存在的多个通信系统制式及相应的信号接收质量信息，供移动台根据移动台所支持的通信系统制式进行选择；接收移动台返回的 OTDOA支持能力消息，OTDOA支持能力消息中包含移动台支持的通信系统制式及相应的信号接收质量；根据移动台支持的通信系统制式及相应的信号接收质量，向移动台下发定位辅助信息，以使移动台根据定位辅助信息上报相应测量结果；实现定位。

Description

釆用观察的到达时间差对移动台进行定位的方法及设备 本申请要求于 2011 年 9 月 28 日提交中国专利局、 申请号为 201110302008.X, 发明名称为 "釆用观察的到达时间差对移动台进行定位 的方法及设备" 的中国专利申请的优先权， 其全部内容通过引用结合在本 申请中。
技术领域
本发明涉及移动台定位技术， 尤其涉及一种釆用观察的到达时间差对 移动台进行定位的方法、 定位服务器及移动台。
发明背景
定位技术即确定移动台的地理位置的技术， 具体利用无线通信网络的 资源来直接或者间接地得到移动台的位置信息。
现有通信系统中釆用的标准的 UE定位方式有三种：网络辅助的 GNSS 定位、 下行定位及 e-CID定位。
对现有通信系统的移动台定位时， 一般先检测移动台和基站之间无线 电波传播信号的特征参数如信号场强、 传播信号到达时间差、 信号到达方 向角等， 再利用相应的定位公式来估计移动台的几何位置 （对于场强和到 达时间的检测是以移动台为测量执行主体， 信号到达方向角的估计是以基 站为测量主体）
下行定位属于网络定位， 主要依靠对移动通信系统内部的无线资源特 征参数检测， 再根据相应的定位公式来估计移动台的位置。
OTDOA定位方式属于下行定位中的一种， 利用移动台接收来自单一 通信系统中的多个基站的下行定位参考信号， 并进行定时测量， 向网络定 位服务器上报基站间的 PRS到达时间差， 网络定位服务器根据接收到的基 站间的 PRS到达时间差进行计算， 得到移动台的地理位置。
现有技术存在的缺陷在于： OTDOA使用单一系统的基站间的 PRS到 达时间差进行定位， 导致定位精度低。 发明内容
本发明实施例提出一种釆用观察的到达时间差对移动台进行定位的方 法及设备， 以提高 OTDOA定位精度。
本发明实施例提供了一种釆用观察的到达时间差对移动台进行定位的 方法， 包括：
向移动台发送观察的到达时间差 OTDOA能力请求消息， 以询问所述 移动台支持的通信系统制式及所支持的通信系统各基站的信号接收质量信 息， 所述 OTDOA能力请求消息中包含所述移动台的当前服务区中存在的 多个通信系统制式及相应的信号接收质量信息， 供所述移动台根据所述移 动台所支持的通信系统制式进行选择；
接收所述移动台返回的 OTDOA支持能力消息， 所述 OTDOA支持能 力消息中包含所述移动台支持的通信系统制式及相应的信号接收质量； 根据所述移动台支持的通信系统制式及相应的信号接收质量， 向所述 移动台下发定位辅助信息， 以使所述移动台根据所述定位辅助信息上报相 应测量结果；
利用所述测量结果对所述移动台进行定位。
本发明实施例还提供了一种釆用观察的到达时间差对移动台进行定位 的方法， 包括：
接收定位服务器发送的观察的到达时间差 OTDOA能力请求消息， 所 述 OTDOA能力请求消息中包含移动台的当前服务区中存在的多个通信系 统制式及相应的信号接收质量信息； 从所述多个通信系统制式中选择所述移动台支持的通信系统制式； 向所述定位服务器发送 OTDOA支持能力消息， 所述 OTDOA支持能 力消息中包含所述移动台支持的通信系统制式及相应的信号接收质量； 接收所述定位服务器下发的定位辅助信息；
根据所述定位辅助信息上报相应测量结果， 以使所述定位服务器利用 所述测量结果对所述移动台进行定位。
本发明实施例还提供了一种釆用观察的到达时间差对移动台进行定位 的定位服务器， 包括：
能力询问模块， 用于向移动台发送观察的到达时间差 OTDOA能力请 求消息， 以询问所述移动台支持的通信系统制式及所支持的通信系统各基 站的信号接收质量信息， 所述 OTDOA能力请求消息中包含所述移动台的 当前服务区中存在的多个通信系统制式及相应的信号接收质量信息， 供所 述移动台根据所述移动台所支持的通信系统制式进行选择；
能力接收模块， 用于接收所述移动台返回的 OTDOA支持能力消息， 所述 OTDOA支持能力消息中包含所述移动台支持的通信系统制式及相应 的信号接收质量；
辅助信息下发模块， 用于根据所述移动台支持的通信系统制式及相应 的信号接收质量， 向所述移动台下发定位辅助信息， 以使所述移动台根据 所述定位辅助信息上 ^艮相应测量结果；
定位模块， 用于利用所述测量结果对所述移动台进行定位。
本发明实施例还提供了一种釆用观察的到达时间差进行定位的移动 台， 包括：
能力询问接收模块， 用于接收定位服务器发送的观察的到达时间差 OTDOA能力请求消息，所述 OTDOA能力请求消息中包含移动台的当前服 务区中存在的多个通信系统制式及相应的信号接收质量信息；
系统制式选择模块， 用于从所述多个通信系统制式中选择所述移动台 支持的通信系统制式；
能力上报模块， 用于向所述定位服务器发送 OTDOA支持能力消息， 所述 OTDOA支持能力消息中包含所述移动台支持的通信系统制式及相应 的信号接收质量；
辅助信息接收模块， 用于接收所述定位服务器下发的定位辅助信息； 测量结果上报模块， 用于根据所述定位辅助信息上报相应测量结果， 以使所述定位服务器利用所述测量结果对所述移动台进行定位。
本发明实施例提供的釆用观察的到达时间差对移动台进行定位的方法 及设备， 通过定位服务器向移动台发送向所述移动台询问其支持的通信系 统制式及所支持的通信系统各基站的信号接收质量信息， 并根据所述移动 台支持的通信系统制式及相应的信号接收质量， 向所述移动台下发定位辅 助信息， 使所述移动台根据所述定位辅助信息上报相应测量结果， 定位服 务器根据测量结果进行定位， 提高了 TODOA定位精度。 附图简要说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例中所 需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本 发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动 的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的一种釆用观察的到达时间差对移动台进行 定位的方法的流程图；
图 2为现有技术 OTDOA定位示意图；
图 3a为现有技术单一系统拓朴示意图；
图 3b为现有技术多通信系统拓朴示意图；
图 4为本发明实施例提供的另一种釆用观察的到达时间差对移动台进 行定位的方法的流程图； 图 5为本发明实施例提供的再一种釆用观察的到达时间差对移动台进 行定位的方法的流程图；
图 6为图 5所示实施例对应的信令交互图；
图 7为本发明实施例提供的釆用观察的到达时间差对移动台进行定位 的方法所获得的移动台侧的平均接收 PRS的 SNR值的累积概率示意图； 图 8为本发明实施例提供的釆用观察的到达时间差对移动台进行定位 的定位服务器的结构示意图；
图 9为本发明实施例提供的釆用观察的到达时间差进行定位的移动台 的结构示意图。 实施本发明的方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进 行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没 有作出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的 范围。
在未来的通信系统中， 将会有多种通信系统并存， 如 LTE、 GSM、 WCDMA等系统同时存在于一个移动台的当前服务区中， 支持多模的 UE 也将大量存在。
图 1 为本发明实施例提供的一种釆用观察的到达时间差对移动台进行 定位的方法的流程图。 本实施例从定位服务器侧对定位方法进行说明， 如 图 1所示， 釆用 OTDOA对移动台进行定位的方法包括：
步骤 11、 向移动台发送观察的到达时间差 OTDOA能力请求消息， 以 询问所述移动台支持的通信系统制式及所支持的通信系统各基站的信号接 收质量信息， 所述 OTDOA能力请求消息中包含所述移动台的当前服务区 中存在的多个通信系统制式及相应的信号接收质量信息， 供所述移动台根 据所述移动台所支持的通信系统制式进行选择；
步骤 12、接收所述移动台返回的 OTDOA支持能力消息，所述 OTDOA 支持能力消息中包含所述移动台支持的通信系统制式及相应的信号接收质 量；
步骤 13、根据所述移动台支持的通信系统制式及相应的信号接收质量， 向所述移动台下发定位辅助信息， 以使所述移动台根据所述定位辅助信息 上报相应测量结果；
步骤 14、 利用所述测量结果对所述移动台进行定位。
由于不同通信系统的基站都可以进行定位参考信号的发送， 而定位服 务器需要根据获得的信息决定移动台在哪种系统的哪个基站上进行 RSTD 测量。 如当单一使用现有通信系统时， 如根据 LTE协议 TS36.133的规定， 每个移动台需要至少测量 16个小区， 而移动台对于每种系统的每个基站都 有不同的接收质量，如果在信号质量较差的现有通信系统小区上进行 RSTD 测量， 可能造成移动台无法正确接收 PRS或者无法正确估计首达径的到达 时间， 并向定位服务器 e-SMLC上报不准确的 RSTD, 最后造成定位误差的 放大， 定位精度较低的问题。 因此在进行定位初始化时， 移动台应该基于 它的测量给定位服务器上报它所支持的通信系统制式及各种通信系统中各 个基站的信号质量， 包括 EUTRA基站的 RSRP和 RSRQ, UTRA基站的 RSSI和 RSCP, GSM基站的 RSSI等。 定位服务器就能够基于移动台上报 的各种系统中各个基站的信号接收质量信息给移动台选择合适的基站来进 行定位， 从而保证更好的定位参考信号接收质量和定位精度。
OTDOA运用于 UTRAN系统中时， 其原理是， 当 UTRAN系统中存在 三个或以上基站时， 网络定位服务器可以根据不同基站下行传输信号的到 达时间差确定移动台的位置。 此下行传输信号可以是参考信号， 也可以是 同步信号。 如图 2所示， 到两个定点距离之差为恒定值的点构成一条双曲 线。 UTRAN系统中存在基站 0、 基站 1和基站 2时， 到基站 0和基站 1距 离之差为^ _ rf。构成一条双曲线， 到基站 1和基站 2距离之差为" 2 - a , 构成另一条双曲线， 两条双曲线的交点即为移动台的位置。 当 UTRAN 系 统中存在的基站数量越多时， 确定的移动台位置越精确， 即移动台的定位 精度越高。
在现有通信系统中， OTDOA定位作为一种网络辅助移动台定位的技 术。 网络侧的定位服务器 e-SMLC通过与基站交互， 获知移动台指定定位 参考信号 （Positioning Reference Signal , PRS ) 的发送和接收配置之后， 基 站下行发送 PRS , 移动台接收来自各个基站的 PRS , 并识别每个 PRS的首 达径位置， 得到各个基站之间的 PRS到达时间差， 并将得到的各个基站之 间的 PRS到达时间差上报至 e-SMLC。 e-SMLC将接收到的各个基站之间的 PRS到达时间差映射成移动台与各个基站之间的距离差， 再利用图 2所示 的双曲线的模型数学， 计算得到移动台的准确位置。
由于 OTDOA定位的精度很大程度上依赖于 PRS信号的接收和首达径 的估计， 因此当多通信系统同时存在， 且移动台支持多模时， 本实施例通 过网络定位服务器根据不同通信系统的基站分布情况， 合理地选择信号接 收质量较好的基站进行 RSTD测量， 可以得到更准确的多个小区测量值， 有效地避免因信号接收质量差导致的无法正确接收 PRS或者无法正确估计 首达径的到达时间等情况， 提高了 OTDOA的定位精度。
如当不支持多模的移动台在单一系统拓朴的拓朴中心时，如图 3a所示， 选择 16 个定位测量小区就可能需要选到距离移动台较远的基站， 如图 3a 中黑色虚线标识的范围， 因此定位参考信号质量可能较差。 如当支持多模 的移动台在多通信系统中时， 如图 3b所示， 第一圈 LTE基站覆盖范围即图 3b中的黑色虚线标识的范围中， 同时存在 GSM、 WCDMA等基站时， 如图 3b 所示的不同灰度背景的长方形即表示不同通信系统的基站。 GSM、 WCDMA等基站可以作为候选基站参与定位， 从而不需要选择距离移动台 较远的 LTE基站参与定位， 提高了用于估计时间差的下行传输信号的信号 接收质量， 从而提高了定位精度。
图 4为本发明实施例提供的另一种釆用观察的到达时间差对移动台进 行定位的方法的流程图。 本实施例从移动台侧对定位方法进行说明， 如图 4 所示， 釆用 OTDOA对移动台进行定位的方法包括：
步骤 41 : 接收定位服务器发送的观察的到达时间差 OTDOA能力请求 消息， 所述 OTDOA能力请求消息中包含移动台的当前服务区中存在的多 个通信系统制式及相应的信号接收质量信息；
步骤 42: 从所述多个通信系统制式中选择所述移动台支持的通信系统 制式；
步骤 43:向所述定位服务器发送 OTDOA支持能力消息，所述 OTDOA 支持能力消息中包含所述移动台支持的通信系统制式及相应的信号接收质 量；
步骤 44: 接收所述定位服务器下发的定位辅助信息；
步骤 45: 根据所述定位辅助信息上报相应测量结果， 以使所述定位服 务器利用所述测量结果对所述移动台进行定位。
从所述多个通信系统制式中选择所述移动台支持的通信系统制式之 前， 还可包括：
判断所述移动台是否支持 OTDOA定位， 若所述移动台支持 OTDOA 定位， 则执行所述从所述多个通信系统制式中选择所述移动台支持的通信 系统制式； 否则， 釆用其他定位方式进行定位。
若所述移动台支持 OTDOA定位， 则执行所述从所述多个通信系统制 式中选择所述移动台支持的通信系统制式之前， 还包括：
判断所述移动台是否支持多模， 若所述移动台支持多模， 则所述从所 述多个通信系统制式中选择所述移动台支持的通信系统制式的过程， 包括： 从所述多个通信系统制式中选择所述移动台支持的多个通信系统制式； 否 则， 所述从所述多个通信系统制式中选择所述移动台支持的通信系统制式 的过程， 包括： 从所述多个通信系统制式中选择所述移动台支持的一个通 信系统制式。
图 5 为本发明实施例提供的再一种釆用观察的到达时间差对移动台进 行定位的方法的流程图。 本实施例基于 RRC-Connected的移动台状态， 而 移动台的激活在本流程进行之前已经完成。 定位方式涉及的信令协议主要 有 LPP (定位服务器与移动台之间的信令交互， 3GPP Technical Specification 36.355TS36.355 )、 LPPa (定位服务器与基站之间的信令交互， TS36.455 )。 图 6为图 5所示实施例对应的信令交互图。如图 5、图 6所示，釆用 OTDOA 对移动台进行定位的方法， 包括：
步骤 51： 移动性管理实体（ Mobile Management Entity , ΜΜΕ )向定位 服务器发起定位某个移动台的定位请求；
步骤 52:定位服务器向该移动台询问是否支持 OTDOA定位及 OTDOA 定位能力。
具体地 ， 如 图 6 所 示 ， 定位服务器给移 动 台 下 发 "OTDOA-RequestCapablities" ,询问 UE是否支持 OTDOA定位及 OTDOA 定位能力， 其中包括新增加的询问移动台所支持的通信系统制式， 以及各 种系统各个基站的信号接收质量信息， 如 E-UTRA基站的 RSRP和 RSRQ, UTRA基站的 RSSI和 RSCP, GSM基站的 RSSI等。
在这之前， 定位服务器给 eNB/NB/BTS下发 "OTDOA INFORMATION REQUEST" , 询问 eNB/NB/BTS有关 OTDOA定位的信息； eNB/NB/BTS 向定位服务器上才艮 "OTDOA INFORMATION RESPONSE" , 其中包含该 eNB/NB/BTS 支持的载波频率； 以告知定位服务器， 移动台需要接收 PRS 的小区的标识， 频点， 以及这些小区的 PRS配置信息。
步骤 53: 移动台判断自身是否支持 OTDOA定位， 如果支持， 执行步 骤 54, 否则， 执行步骤 58。
步骤 54: 移动台判断自身是否支持多模， 对于支持多模的移动台， 移 动台能够对不同通信系统的基站进行测量； 如果支持， 则执行步骤 55 , 否 则， 执行步骤 56;
步骤 55: 移动台向定位服务器上报支持自身多模的能力， 以及移动台 对各通信系统各个基站的信号接收质量。
具体地， 如图 6 所示， 移动台给定位服务器上报包含多 RTA信息 ( containing multi RTA information ) 的 OTDOA 提 供 能 力 ( "OTDOA-ProvideCapablities" ), 包含移动台的 OTDOA能力， 新增加的 移动台所支持的通信系统制式， 以及各通信系统各个基站的信号接收质量 信息， 如 EUTRA基站的 RSRP和 RSRQ, UTRA基站的 RSSI和 RSCP, GSM基站的 RSSI等。
步骤 56: 移动台向定位服务器只上报移动台对 E-UTRA基站的信号接 收质量。 具体仍如图 6 所示 ， 移动 台 给定位服务器上报 "OTDOA-ProvideCapablities" ,包含移动台的 OTDOA能力，及来自 EUTRA 基站的 RSRP和 RSRQ。
步骤 57: 定位服务器根据移动台上报的信号接收质量， 下发定位辅助 信息也即定位服务器与基站交互时基站上报的信息， 以指示移动台选择信 道优良的基站为移动台进行定位服务。 定位辅助信息含移动台需要接收 PRS的小区的标识， 频点， 以及这些小区的 PRS配置信息。
具体地 ， 如 图 6 所 示 ， 定位服务器给移 动 台 下 发 "OTDOA-ProvideAssistanceData" , 通知移动台定位辅助信息。
步骤 58: 釆用其它定位方式。
本实施例中， 定位服务器通过在与移动台交互过程中携带所述移动台 的当前服务器中的多个通信系统制式及相应的信号接收质量， 定位服务器 能够知道移动台所支持的多种通信系统， 也知道对于各个通信系统移动台 接收的来自各个基站的信号接收质量。 这样， 定位服务器根据移动台所支 持的通信系统， 通知移动台在信号质量最好的基站上进行 RSTD测量， 然 后根据测量结果进行定位计算， 对移动台进行定位。
下面分别以支持多模的移动台和不支持多模的移动台为例， 对釆用
OTDOA对移动台进行定位的方法做进一步详细说明。
对支持多模的移动台进行定位的实施例
假设某一移动台支持多模， 且该移动台的当前服务区也即移动台所处 的无线环境中存在 E-UTRA、 UTRA、 GSM系统， 对该移动台进行 OTDOA 定位的流程包括：
第一步： 该移动台发起 "Location service request" 给 MME;
第二步： MME透传至定位服务器；
第三步： 定位服务器发送 "capability request" 给移动台， 并同时询问 移动台所支持的通信系统制式， 以及各种系统各个基站的信号接收质量信 息。
如定位服务器给移动台下发 OTDOA-RequestCapablities中：
-- ASN1 START
OTDOA-RequestCapabilities：: = SEQUENCE
UE capabilities support multi RAT
RSRP and RSRQ in EUTRA
RSSI/RSCP in UTRA
RSSI in GSM
- ASN1STOP 第四步： 移动台发送 capability provide给定位服务器， 回复自己支持 OTDOA定位， 同时上 ^艮移动台所支持的通信系统制式， 以及各种系统各个 基站的信号接收质量信息， 如 EUTRA基站的 RSRP和 RSRQ, UTRA基站 的 RSSI和 RSCP, GSM基站的 RSSI等。
移动台给定位服务器上报 OTDOA-ProvideCapablities:
-- ASN1 START
OTDOA-ProvideCapabilities：: = SEQUENCE {
otdoa-Mode BIT STRING { ue-assisted (0) } (SIZE (1..8)), supportedBandListEUTRA SEQUENCE (SIZE (L.maxBands)) OF SupportedBandEUTRA OPTIONAL
maxBands INTEGER：:
SupportedBandEUTRA：:
bandEUTRA INTEGER (1..64)}
UE capabilities support multi RAT
RSRP and RSRQ in EUTRA
RSSI/RSCP in UTRA
RSSI in GSM
- ASN1STOP
本实施例适用于多系统场景下支持多模的移动台选择合适的基站进行 OTDOA定位。
对不支持多模的移动台进行定位的实施例
假设某一移动台只支持 E-UTRA系统， 但是该移动台的当前服务区中 存在 E-UTRA、 UTRA, GSM系统， 对该移动台进行 OTDOA定位的流程 包括：
第一步： 该移动台发起 Location service request给 MME； 第二步： MME透传至定位服务器；
第三步： 定位服务器发送 capability request给移动台， 并同时询问它所 支持的通信系统制式， 以及各种系统各个基站的信号接收质量信息。
如定位服务器给移动台下发 OTDOA-RequestCapablities中：
-- ASN1 START
OTDOA-RequestCapabilities：: = SEQUENCE
UE capabilities support multi RAT
RSRP and RSRQ in EUTRA
RSSI/RSCP in UTRA
RSSI in GSM
- ASN1STOP
第四步： 移动台发送 capability provide给定位服务器， 回复自己支持 OTDOA定位 , 上报它只支持 E-UTRA通信系统 , 以及对 E-UTRA各个基 站的信号接收质量信息， 如 RSRP和 RSRQ等。
如 UE给定位服务器上报 OTDOA-ProvideCapablities:
-- ASN1 START
OTDOA-ProvideCapabilities：: = SEQUENCE {
otdoa-Mode BIT STRING { ue-assisted (0) } (SIZE (1..8)), supportedBandListEUTRA SEQUENCE (SIZE (L.maxBands)) OF SupportedBandEUTRA OPTIONAL maxBands INTEGER：: = 64
SupportedBandEUTRA：: = SEQUENCE {
bandEUTRA INTEGER (1..64)}
UE capabilities support EUTRA
RSRP and RSRQ in EUTRA
ASN1STOP
本实施例中， 移动台通过在上报的 "OTDOA-ProvideCapablities" 中携 带移动台支持的一个通信系统及来自该通信系统各基站的信号接收质量， 使得本发明实施例提供的釆用 OTDOA对移动台定位的方法同样能够适用 于单一模式的移动台， 提高了定位的灵活性。
上述实施例， 通过获取移动台所支持的通信系统及相应的信号接收质 量， 并从中选择可使移动台接收的 PRS质量较好的通信系统的基站向移动 台下发 PRS, 保证了移动台接收 PRS的质量， 减少了移动台功耗。 如图 7 所示， 使用多通信系统的基站进行定位测量， 移动台侧的平均接收 SNR值 比使用单一 LTE网络的平均 SNR值有明显提高， 并且， 由于 PRS的质量 提升， 直接提高了定位精度。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机 可读取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序 代码的介质。
图 8为本发明实施例提供的釆用观察的到达时间差对移动台进行定位 的定位服务器的结构示意图。 如图 8所示， 定位服务器用于执行图 1所示 实施例的方法， 包括：
能力询问模块 81用于向移动台发送观察的到达时间差 OTDOA能力请 求消息， 以询问所述移动台支持的通信系统制式及所支持的通信系统各基 站的信号接收质量信息， 所述 OTDOA能力请求消息中包含所述移动台的 当前服务区中存在的多个通信系统制式及相应的信号接收质量信息， 供所 述移动台根据所述移动台所支持的通信系统制式进行选择；
能力接收模块 82用于接收所述移动台返回的 OTDOA支持能力消息， 所述 OTDOA支持能力消息中包含所述移动台支持的通信系统制式及相应 的信号接收质量；
辅助信息下发模块 83用于根据所述移动台支持的通信系统制式及相应 的信号接收质量， 向所述移动台下发定位辅助信息， 以使所述移动台根据 所述定位辅助信息上 ^艮相应测量结果；
定位模块 84用于利用所述测量结果对所述移动台进行定位。
图 9为本发明实施例提供的釆用观察的到达时间差进行定位的移动台 的结构示意图。 如图 9所示， 移动台用于执行图 4所示实施例的方法， 包 括： 能力询问接收模块 91、 系统制式选择模块 92、 能力上报模块 93、 辅助 信息接收模块 94及测量结果上报模块 95。
能力询问接收模块 91 用于接收定位服务器发送的观察的到达时间差 OTDOA能力请求消息，所述 OTDOA能力请求消息中包含移动台的当前服 务区中存在的多个通信系统制式及相应的信号接收质量信息；
系统制式选择模块 92用于从所述多个通信系统制式中选择所述移动台 支持的通信系统制式；
能力上报模块 93用于向所述定位服务器发送 OTDOA支持能力消息， 所述 OTDOA支持能力消息中包含所述移动台支持的通信系统制式及相应 的信号接收质量；
辅助信息接收模块 94用于接收所述定位服务器下发的定位辅助信息； 测量结果上报模块 95用于根据所述定位辅助信息上报相应测量结果， 以使所述定位服务器利用所述测量结果对所述移动台进行定位。
本发明实施例提供的釆用观察的到达时间差进行定位的移动台还包 括： 定位方式判断模块， 用于在从所述多个通信系统制式中选择所述移动 台支持的通信系统制式之前， 判断所述移动台是否支持 OTDOA定位； 此 时， 所述系统制式选择模块还用于若所述移动台支持 OTDOA定位， 则执 行所述从所述多个通信系统制式中选择所述移动台支持的通信系统制式。
本发明实施例提供的釆用观察的到达时间差进行定位的移动台还可包 括： 多模判断模块， 用于若所述移动台支持 OTDOA定位， 则在执行所述 从所述多个通信系统制式中选择所述移动台支持的通信系统制式之前， 判 断所述移动台是否支持多模； 此时， 所述系统制式选择模块还用于若所述 移动台支持多模， 从所述多个通信系统制式中选择所述移动台支持的多个 通信系统制式； 否则， 从所述多个通信系统制式中选择所述移动台支持的 一个通信系统制式。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对 其限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通 技术人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修 改， 或者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、一种釆用观察的到达时间差对移动台进行定位的方法，其特征在于， 包括：
向移动台发送观察的到达时间差 0TD0A能力请求消息，以询问所述移动 台支持的通信系统制式及所支持的通信系统各基站的信号接收质量信息， 所述 0TD0A 能力请求消息中包含所述移动台的当前服务区中存在的多个通 信系统制式及相应的信号接收质量信息， 供所述移动台根据所述移动台所 支持的通信系统制式进行选择；
接收所述移动台返回的 0TD0A支持能力消息，所述 0TD0A支持能力消息 中包含所述移动台支持的通信系统制式及相应的信号接收质量；
根据所述移动台支持的通信系统制式及相应的信号接收质量，向所述移 动台下发定位辅助信息， 以使所述移动台根据所述定位辅助信息上报相应 测量结果；
利用所述测量结果对所述移动台进行定位。
2、 根据权利要求 1所述的釆用观察的到达时间差对移动台进行定位的 方法， 其特征在于， 所述 0TD0A支持能力消息中包含所述移动台支持的多 个通信系统制式。
3、一种釆用观察的到达时间差对移动台进行定位的方法，其特征在于， 包括：
接收定位服务器发送的观察的到达时间差 0TD0A 能力请求消息， 所述 0TD0A 能力请求消息中包含移动台的当前服务区中存在的多个通信系统制 式及相应的信号接收质量信息；
从所述多个通信系统制式中选择所述移动台支持的通信系统制式； 向所述定位服务器发送 0TD0A支持能力消息，所述 0TD0A支持能力消息 中包含所述移动台支持的通信系统制式及相应的信号接收质量；
接收所述定位服务器下发的定位辅助信息； 根据所述定位辅助信息上报相应测量结果，以使所述定位服务器利用所 述测量结果对所述移动台进行定位。
4、 根据权利要求 3所述的釆用观察的到达时间差对移动台进行定位的 方法， 其特征在于， 从所述多个通信系统制式中选择所述移动台支持的通 信系统制式之前， 还包括：
判断所述移动台是否支持 0TD0A定位， 若所述移动台支持 0TD0A定位 , 则执行所述从所述多个通信系统制式中选择所述移动台支持的通信系统制 式； 否则， 釆用其他定位方式进行定位。
5、 根据权利要求 4所述的釆用观察的到达时间差对移动台进行定位的 方法， 其特征在于， 若所述移动台支持 0TD0A定位， 则执行所述从所述多 个通信系统制式中选择所述移动台支持的通信系统制式之前， 还包括： 判断所述移动台是否支持多模，若所述移动台支持多模，则所述从所述 多个通信系统制式中选择所述移动台支持的通信系统制式的过程， 包括： 从所述多个通信系统制式中选择所述移动台支持的多个通信系统制式； 否 则， 所述从所述多个通信系统制式中选择所述移动台支持的通信系统制式 的过程， 包括： 从所述多个通信系统制式中选择所述移动台支持的一个通 信系统制式。
6、 一种釆用观察的到达时间差对移动台进行定位的定位服务器， 其特 征在于， 包括：
能力询问模块，用于向移动台发送观察的到达时间差 0TD0A能力请求消 息， 以询问所述移动台支持的通信系统制式及所支持的通信系统各基站的 信号接收质量信息， 所述 0TD0A 能力请求消息中包含所述移动台的当前服 务区中存在的多个通信系统制式及相应的信号接收质量信息， 供所述移动 台根据所述移动台所支持的通信系统制式进行选择；
能力接收模块，用于接收所述移动台返回的 0TD0A支持能力消息，所述 0TD0A 支持能力消息中包含所述移动台支持的通信系统制式及相应的信号 接收质量；
辅助信息下发模块，用于根据所述移动台支持的通信系统制式及相应的 信号接收质量， 向所述移动台下发定位辅助信息， 以使所述移动台根据所 述定位辅助信息上 ^艮相应测量结果；
定位模块， 用于利用所述测量结果对所述移动台进行定位。
7、 一种釆用观察的到达时间差进行定位的移动台， 其特征在于， 包括： 能力询问接收模块， 用于接收定位服务器发送的观察的到达时间差
0TD0A能力请求消息，所述 0TD0A能力请求消息中包含移动台的当前服务区 中存在的多个通信系统制式及相应的信号接收质量信息；
系统制式选择模块，用于从所述多个通信系统制式中选择所述移动台支 持的通信系统制式；
能力上报模块，用于向所述定位服务器发送 0TD0A支持能力消息，所述 0TD0A 支持能力消息中包含所述移动台支持的通信系统制式及相应的信号 接收质量；
辅助信息接收模块， 用于接收所述定位服务器下发的定位辅助信息； 测量结果上报模块，用于根据所述定位辅助信息上报相应测量结果， 以 使所述定位服务器利用所述测量结果对所述移动台进行定位。
8、 根据权利要求 7所述的釆用观察的到达时间差进行定位的移动台， 其特征在于， 还包括：
定位方式判断模块，用于在从所述多个通信系统制式中选择所述移动台 支持的通信系统制式之前， 判断所述移动台是否支持 0TD0A定位；
所述系统制式选择模块，用于若所述移动台支持 0TD0A定位，则执行所 述从所述多个通信系统制式中选择所述移动台支持的通信系统制式。
9、 根据权利要求 8所述的釆用观察的到达时间差进行定位的移动台， 其特征在于， 还包括：
多模判断模块，用于若所述移动台支持 0TD0A定位，则在执行所述从所 述多个通信系统制式中选择所述移动台支持的通信系统制式之前， 判断所 述移动台是否支持多模；
所述系统制式选择模块，还用于若所述移动台支持多模，从所述多个通 信系统制式中选择所述移动台支持的多个通信系统制式； 否则， 从所述多 个通信系统制式中选择所述移动台支持的一个通信系统制式。
PCT/CN2012/082332 2011-09-28 2012-09-28 采用观察的到达时间差对移动台进行定位的方法及设备 WO2013044853A1 (zh)

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US9572127B2 (en) 2017-02-14
US20160073374A1 (en) 2016-03-10
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US20140213289A1 (en) 2014-07-31
US9229094B2 (en) 2016-01-05

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