WO2013013604A1 - Procédé et dispositif de localisation de station mobile dans un réseau hétérogène - Google Patents

Procédé et dispositif de localisation de station mobile dans un réseau hétérogène Download PDF

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Publication number
WO2013013604A1
WO2013013604A1 PCT/CN2012/079000 CN2012079000W WO2013013604A1 WO 2013013604 A1 WO2013013604 A1 WO 2013013604A1 CN 2012079000 W CN2012079000 W CN 2012079000W WO 2013013604 A1 WO2013013604 A1 WO 2013013604A1
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Prior art keywords
mobile station
positioning
cell
reference signal
positioning reference
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PCT/CN2012/079000
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English (en)
Chinese (zh)
Inventor
肖登坤
崔杰
韩静
杜元锋
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华为技术有限公司
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Publication of WO2013013604A1 publication Critical patent/WO2013013604A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a mobile station positioning method and device in a heterogeneous network.
  • a mobile station positioning method and device in a heterogeneous network.
  • GNSS Global Navigation Satellite System
  • OTDOA Observed Time Difference of Arrival
  • CID cell identification
  • the GNSS positioning method requires the mobile station to have the function of receiving GNSS signals.
  • the specific implementation of GNSS positioning includes the positioning of the Global Positioning System (GPS) in the United States, the Galileo positioning in Europe, the Beidou positioning in China, and the GLONASS positioning in Russia.
  • GPS Global Positioning System
  • the mobile station receives a GPS signal for positioning by setting a GPS module.
  • OTDOA positioning and CID positioning are both types of network positioning and are the hotspot of current research.
  • the OTDOA positioning is to use a mobile station to receive a Positioning Reference Signal (PSS) from a plurality of base stations and perform timing measurement to obtain a PRS Time Difference (RSTD) between different base stations and report the result to the
  • PSS Positioning Reference Signal
  • RSTD PRS Time Difference
  • the Enhanced Serving Mobile Location Centre (E-SMLC) is calculated by the E-SMLC using a positioning algorithm to obtain the geographic location of the mobile station.
  • the CID positioning is an identifier (ID) of a cell in which the mobile station is located to represent the geographic location of the mobile station. Therefore, the uniqueness of the cell ID becomes a crucial one. Factors. CID positioning is one of the most convenient, simple, and easiest to implement positioning methods, but it is also the method with the lowest positioning accuracy. The positioning accuracy depends on the coverage radius of the cell.
  • LPNs low power nodes
  • Het-net heterogeneous network
  • the data signal sent by the LPN may cause interference to the PRS signal sent by other base stations (such as the macro base station), especially when the mobile station is close to the coverage of the LPN, the mobile station may not receive the PRS normally or may not correctly estimate the RSTD.
  • An inaccurate RSTD is reported to the E-SMLC, which eventually causes amplification of the positioning error. Therefore, how to use the positioning method in the homogeneous network to the heterogeneous network to achieve accurate positioning of the mobile station is a technical problem that needs to be solved.
  • Embodiments of the present invention provide a mobile station positioning method and device in a heterogeneous network, which can perform accurate positioning of a mobile station according to a positioning manner in a homogeneous network.
  • a mobile station positioning method in a heterogeneous network comprising:
  • a cell type of the home cell where the cell type of the home cell is a low power node cell or a macro cell;
  • the cell type of the home cell is a low-power node cell, determine whether the coverage radius of the home cell is less than or equal to a radius threshold that satisfies the positioning accuracy, and if yes, use the cell identity of the home cell as the mobile The geographical location of the station.
  • a mobile station positioning device in a heterogeneous network includes: a receiving unit, configured to receive a location request message sent by the mobile station by using a mobility management entity or a relay node, where the location request message carries a cell identifier of a home cell of the mobile station, and a first determining unit, configured to Determining, by the cell identifier, a cell type of the home cell, where the cell type of the home cell is a low power node cell or a macro cell;
  • a first determining unit configured to determine, when the first determining unit determines that the cell type of the home cell is a low power node cell, whether the coverage radius of the home cell is less than or equal to a radius threshold that satisfies the positioning accuracy If yes, the cell identity of the home cell is used as the geographic location identifier of the mobile station.
  • the cell of the mobile station's home cell may be determined according to the cell identity of the mobile station's home cell carried in the location request message.
  • the type is a low-power node cell or a macro cell.
  • the embodiment of the present invention can accurately locate the mobile station by using the positioning mode (ie, CID positioning) in the homogeneous network in the heterogeneous network composed of the macro cell and the low power node cell.
  • FIG. 1 is a schematic flowchart of a method for positioning a mobile station in a heterogeneous network according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another method for positioning a mobile station in a heterogeneous network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a network distribution location according to an embodiment of the present invention.
  • FIG. 4 to FIG. 6 are schematic diagrams showing the flow of a mobile station positioning method in several heterogeneous networks according to an embodiment of the present invention
  • FIG. 7 to FIG. 10 are schematic diagrams showing the structure of a mobile station positioning apparatus in several heterogeneous networks according to an embodiment of the present invention.
  • Embodiments of the present invention provide a mobile station positioning method and device in a heterogeneous network, which can perform accurate positioning of a mobile station according to a positioning manner in a homogeneous network. The details are described below separately.
  • FIG. 1 is a schematic flowchart of a method for locating a mobile station in a heterogeneous network according to an embodiment of the present invention. As shown in FIG. 1, the positioning method may include the following steps:
  • a positioning request message sent by a mobile station by using a mobility management entity (Mobility Management Entity, ⁇ ) or a relay node (RN), where the positioning request message carries a cell identifier of a mobile station home cell.
  • a mobility management entity Mobility Management Entity, ⁇
  • RN relay node
  • the cell identifier of the mobile station home cell may be a Cell Global Identification (CGI) of the home cell.
  • CGI Cell Global Identification
  • the embodiment of the present invention may also use other parameters or attributes that uniquely identify the identity of the cell to represent the cell identifier of the home cell, which is not limited in the embodiment of the present invention.
  • 102 Determine, according to the foregoing cell identifier, a cell type of the home cell, where the cell type of the home cell is an LPN cell or a macro cell.
  • the low-power node may be a home base station, a micro base station, a pico base station, or the like, which is not limited in the embodiment of the present invention. 103. If the cell type of the home cell is an LPN cell, determine whether the coverage radius of the home cell is less than or equal to a radius threshold R_LPN that satisfies the positioning accuracy, and if yes, use the cell identity of the home cell as the geographic location of the mobile station. Location identifier.
  • the radius threshold value R-LPN that satisfies the positioning accuracy may be 50m, 100m, 125m, 150m, etc., and may be set to other values according to the actual positioning accuracy requirement, which is not limited in the embodiment of the present invention.
  • the coverage radius of the home cell is less than or equal to the radius threshold R-LPN that satisfies the positioning accuracy, the coverage of the home cell is considered to be the geographical location of the mobile station, and the coverage of the home cell has met the positioning accuracy requirement.
  • the positioning method in the homogeneous network is used to accurately locate the mobile station.
  • the embodiments of the present invention will be described in detail later.
  • the coverage radius of the mobile station's home cell is less than or equal to the radius threshold R LPN that satisfies the positioning accuracy
  • the coverage of the mobile station's home cell has met the positioning accuracy requirement
  • the mobile station's home cell may be The cell identity is used as the geographic location identifier of the mobile station, thereby achieving accurate positioning of the mobile station. It can be seen that the embodiment of the present invention can perform accurate positioning of the mobile station by using a positioning mode (ie, E-CID positioning) in a homogeneous network in a heterogeneous network composed of a macro cell and a low power node cell.
  • a positioning mode ie, E-CID positioning
  • FIG. 2 is a schematic flowchart diagram of another method for positioning a mobile station in a heterogeneous network according to an embodiment of the present invention.
  • the mobile station sends a positioning request message to the E-SMLC through the MME, and the E-SMLC accurately locates the mobile station.
  • the positioning method may include the following steps:
  • the E-SMLC receives a positioning request message sent by the mobile station by using the MME, where the positioning request message carries the CGI of the mobile station's home cell.
  • the MME may write the CGI of the mobile station's home cell into the location request message and transparently transmit the message to the E-SMLC, and the E-SMLC accurately locates the mobile station. .
  • the MME stores the mobile station home cell information (including the CGI of the home cell), and the MME receives the location request message sent by the mobile station.
  • the CGI of the mobile station's home cell may be obtained from the stored mobile station's home cell information, and the location request message is written and transmitted to the E-SMLC, so that the E-SMLC determines the mobile station's attribution according to the CGI of the mobile station's home cell.
  • the cell type of the cell can further selectively locate the mobile station by using the positioning method in the homogeneous network.
  • the E-SMLC determines the cell type of the home cell according to the CGI of the mobile station's home cell. If the cell type of the home cell is an LPN cell, step 203 is performed. If the cell type of the home cell is a macro cell, step 210 is performed.
  • the E-SMLC determines whether the coverage radius of the home cell is less than or equal to a radius threshold R_LPN that satisfies the positioning accuracy. If yes, the CGI of the home cell is used as the mobile station. The geographical location identifier, and the process ends; if not, step 204 is performed.
  • the coverage radius of the LPN cell is related to its self-transmitted power level. Therefore, a mapping table of the coverage radius and the self-transmitted power level of the LPN cell may be established in advance on the LPN and stored.
  • the E-SMLC determines that the cell type of the mobile station's home cell is an LPN cell
  • the E-SMLC can perform signaling interaction with the LPN to obtain the coverage radius of the LPN cell and compare it with the radius threshold R-LPN that satisfies the positioning accuracy. Therefore, it is determined whether the CGI of the home cell is used as the geographical location identifier of the mobile station, that is, whether the CID positioning mode in the homogeneous network is selected to accurately locate the mobile station.
  • the E-SMLC determines whether the coverage radius of the home cell is less than or equal to the radius threshold value of the positioning accuracy R-LPN, and the specific process may be as follows:
  • the E-SMLC sends a request to report the coverage information to the LPN.
  • the E-SMLC sends the request to the LPN.
  • the overlay information can be loaded into the LPPa signaling OTDOA Information Request (for example, Coverage Level INTEGER ( 0, 1 ... )).
  • the E-SMLC receives the coverage information reported by the LPN, where the coverage information carries the coverage radius of the mobile station's home cell; wherein, the coverage radius of the mobile station's home cell is transmitted by the LPN according to its own transmit power level. Obtained in the mapping table of rank and coverage radius. Accordingly, the LPN can upload its coverage information to the E-SMLC by signaling the OTDOA Information Response.
  • E-SMLC determines whether the coverage radius of the mobile station's home cell is less than or equal to the radius threshold R-LPN that satisfies the positioning accuracy.
  • LPN is generally used to solve hotspot coverage or fill signal black holes, so its coverage radius is generally much smaller than the coverage radius of the macro cell. If the cell radius of the LPN is less than or equal to the radius threshold R-LPN that satisfies the positioning accuracy, the location of the LPN can be directly used to represent the geographic location of the mobile station within its coverage (i.e., CID positioning).
  • the radius threshold R_LPN that satisfies the positioning accuracy is used to determine whether the coverage radius of the LPN cell is less than or equal to R-LPN. If the coverage radius of the LPN cell is greater than R-LPN, the location of the LPN cannot be directly used. To represent the geographic location of the mobile station within its coverage (ie, CID positioning is not applicable, there will be serious positioning errors), and a more precise positioning method needs to be selected to determine the geographic location of the mobile station in the LPN cell.
  • the coverage radius of the LPN cell depends on the self-transmitting power level of the LPN, and a mapping table of the coverage radius and the self-transmitting power level can be established and stored on the LPN.
  • the mapping table can be: 3 ⁇ 4 port shown in Table 1 below.
  • Table 1 Mapping table of coverage radius and self-transmitted power level of LPN cells
  • the LPN when the self-transmitting power level of the LPN is 27 dBm, the LPN can know that its corresponding coverage radius is X meters according to the mapping table shown in Table 1, and report it to the E-SML.
  • the E-SMLC determines whether the X-meter is determined by the E-SMLC. Less than or equal to R-LPN, and then E-SMLC determines whether the CID positioning method is used to accurately locate the mobile station.
  • the E-SMLC determines whether the mobile station has the GNSS positioning function, if Go to step 205; if not, execute Step 208.
  • the GNSS positioning function may be any one or more of a GPS positioning function, a Galileo positioning function, a Beidou positioning function, or a GLONAS positioning function, which is not limited by the embodiment of the present invention.
  • the E-SMLC determines that the cell type of the mobile station home cell is an LPN cell, and the coverage radius of the mobile station home cell is greater than a radius threshold R that satisfies the positioning accuracy.
  • the request capability message request capability may be sent to the mobile station, where the request capability message is used to query the positioning mode supported by the mobile station; and the request capability response message response capability reported by the mobile station is received, and the location carried by the request capability response message is used.
  • the mobile station can also actively report the supported positioning mode to the E-SMLC, so that the signaling overhead of the E-SMLC can be saved, which is not limited in the embodiment of the present invention.
  • the mobile station may employ different parameters or attributes in the request capability response message response capability to characterize whether or not the GNSS positioning function is available.
  • E-SMLC Trigger The GNSS sends a positioning reference signal to the mobile station, and step 206 is performed.
  • the specific process of the E-SMLC triggering the GNSS to send the positioning reference signal to the mobile station can be: 3 ⁇ 4:
  • the E-SMLC performs signaling interaction with the GNSS to obtain positioning information configuration information of the GNSS.
  • the process of signaling interaction between the E-SMLC and the GNSS also includes a process of initializing the GNSS.
  • the E-SMLC sends the positioning reference signal configuration information of the GNSS to the mobile station, so that the mobile station receives the positioning reference signal sent by the GNSS within the specified time of the positioning reference signal configuration information, and receives the positioning reference signal of the GNSS. Time value.
  • the specific process of the mobile station receiving the positioning reference signal sent by the GNSS within the specified time of the positioning reference signal configuration information of the GNSS, and the specific process of reporting the time value of the positioning reference signal received by the GNSS belong to the prior art.
  • the common knowledge well known to the person is not described in detail in the embodiments of the present invention.
  • the E-SMLC determines whether the measurement result reported by the mobile station is received within a preset time interval T, where the measurement result is a time value that the mobile station receives the positioning reference signal sent by the GNSS; if yes, step 207 is performed; Otherwise, step 208 is performed.
  • the E-SMLC receives the measurement result reported by the mobile station within the preset time interval T, it indicates that the GNSS positioning mode of the mobile station is currently available; otherwise, if the E-SMLC does not receive the preset time interval T The measurement result reported to the mobile station indicates that the GNSS positioning mode of the mobile station is currently unavailable.
  • the E-SMLC calculates the geographic location of the mobile station by using a positioning algorithm based on the foregoing time value, and ends the process.
  • the E-SMLC determines that the mobile station does not have the GNSS positioning function, or does not receive the measurement result reported by the mobile station within the preset time interval T, the E-SMLC notifies the LPN to participate in the OTDOA positioning, and obtains the PRS information.
  • the specific process of the E-SMLC notifying the LPN to participate in the OTDOA positioning and obtaining the PRS information may be as follows:
  • the E-SMLC sends a notification message to the LPN and the base stations around the mobile station to participate in the positioning of the mobile station.
  • the E-SMLC performs a positioning reference signal and a transmission timing configuration for the LPN, and interacts with the base station around the mobile station to obtain a positioning reference signal and a transmission timing configuration of the base station around the mobile station.
  • the E-SMLC transmits the positioning reference signal and the transmission timing configuration information of the LPN to the mobile station, and transmits the positioning reference signal and the transmission timing configuration of the base station around the mobile station to the mobile station.
  • RSTD positioning reference signal arrival time difference
  • the RSTD reported by the mobile station includes the surrounding base received by the mobile station.
  • step 211 is performed; otherwise, step 214 is performed.
  • E-SMLC Trigger The GNSS sends a positioning reference signal to the mobile station, and step 212 is performed.
  • the specific process of the E-SMLC triggering the GNSS to send the positioning reference signal to the mobile station in step 211 is the same as the step 205, and is not repeated in the embodiment of the present invention.
  • the E-SMLC determines whether the measurement result reported by the mobile station is received within a preset time interval T, where the measurement result is a time value that the mobile station receives the positioning reference signal sent by the GNSS; if yes, step 213 is performed; Otherwise, step 214 is performed.
  • the E-SMLC calculates the geographic location of the mobile station by using the positioning algorithm based on the foregoing time value, and ends the process.
  • the E-SMLC determines whether the interference level value of the LPN to the mobile station is greater than a preset interference level threshold. If yes, step 208 and step 209 are performed; if not, step 215 and step 209 are performed.
  • the interference level value of the LPN to the mobile station may be represented by a Signal Noise Ratio (SNR).
  • SNR Signal Noise Ratio
  • SNR_LPN the preset interference level threshold
  • the LPN is considered to be mobile.
  • the interference effect of the station inform the LPN to participate in the OTDOA positioning of the mobile station, and improve the accuracy of the OTDOA positioning.
  • the SNR of the LPN to the mobile station is less than or equal to the preset interference level threshold SNR_LPN, it indicates that the interference of the LPN to the mobile station is within the allowable range, and when the mobile station is accurately located by using the OTDOA positioning method, Considering the interference effect of the LPN on the mobile station, it is not necessary to inform the LPN to participate in the OTDOA positioning of the mobile station. 215.
  • the E-SMLC notifies the base station of the mobile station other than the LPN to participate in the OTDOA positioning, and acquires a positioning reference signal and a transmission timing configuration of the base station around the mobile station.
  • the E-SMLC may send a notification message participating in the positioning of the mobile station to the base station around the mobile station, and interact with the base station around the mobile station to obtain a positioning reference signal and a transmission timing configuration of the base station around the mobile station, and a base station around the mobile station.
  • the positioning reference signal and the transmission timing configuration are sent to the mobile station.
  • the E-SMLC further performs step 209, where the RSTD reported by the mobile station in step 209 includes only the time difference of the positioning reference signal between the surrounding base stations received by the mobile station. .
  • the mobile station can obtain the interference level value (SNR) of the LPN by measuring the Reference Signal Receiving Power (RSRP) of its neighboring LPN.
  • SNR interference level value
  • RSRP Reference Signal Receiving Power
  • the E-SMLC may send a mobile station signaling the OTDOA-Request Neighbor SNR (the CGI information of the LPN is included in the signaling), and notify the mobile station to report the RSRP of the LPN; the mobile station is measuring Upon completion, it will return a signaling OTDOA-Neighbor SNR Response (the signaling contains the CGI information of the LPN and the measured RSRP level) to the E-SMLC, indicating the RSRP of the LPN.
  • OTDOA-Request Neighbor SNR the CGI information of the LPN is included in the signaling
  • the corresponding accuracy of the RSTD is required to ensure the accuracy of the positioning.
  • the standard stipulates that under the transmission bandwidth of 10 MHz, the RSD of the PRS shall not exceed the ITs; under the transmission bandwidth of 1.4 MHz, the PRS RSTD shall not exceed 8Ts; in a heterogeneous network, if the LPN is not used as a positioning node, the LPN will receive interference when the mobile station approaches the LPN cell coverage. According to the simulation, the following Table 2 is obtained:
  • NPRS indicates the number of consecutively transmitted PRS subframes, 1.4 MHz transmission bandwidth requires 6 consecutive PRS subframes, and 10 MHz transmission bandwidth uses at least 1 PRS subframe
  • macro cell SNR boundary condition is ⁇ -6 , -13>dB
  • the LPN is introduced to generate interference, the SNR of the LPN is continuously increased (indicating that the distance between the mobile station and the LPN is larger), it can be seen that when the SNR of the LPN is greater than -3 dB (when using 10 MHz transmission) Bandwidth) or -9dB (when using 1.4MHz transmission bandwidth), the RSTD error does not meet the OTDOA positioning requirements, and the OTDOA algorithm is not applicable.
  • the embodiment of the present invention needs to judge the interference level value, and confirm whether the interference of the LPN to the mobile station is below -3dB (when using 10MHz transmission bandwidth) or -9dB (when using 1.4MHz transmission bandwidth), if yes, Then the OTDOA that can use the homogeneous network
  • the positioning method accurately locates the mobile station, does not require the LPN to participate in positioning, and does not need to configure new signaling or parameters for the LPN to participate in positioning.
  • the interference of the LPN to the mobile station is greater than -3dB (when using 10MHz transmission bandwidth) or -9dB (when using 1.4MHz transmission bandwidth)
  • the mobile station In the process of performing mobile station positioning, the mobile station needs to be in the RRC-Connected state, and the activation of the mobile station is completed before the positioning is performed.
  • the signaling protocols involved in the positioning process mainly include LPP (for signaling interaction between E-SMLC and mobile stations, see standard TS36.355), and LPPa (for use between E-SMLC and base stations). Signaling interaction, see standard TS36.455).
  • the mobile station participating in the mobile station positioning is the RN under the same donor base station (DeNB) or the DeNB itself, as shown in Fig. 3, the mobile station can be located by the DeNB.
  • the specific implementation process of the DeNB for locating the mobile station is the same as that of FIG. 2, and is not repeated in the embodiment of the present invention.
  • the mobile station when a mobile station in a DeNB cell needs to perform positioning, the mobile station may measure the RSRP of the neighboring cell and report it to the DeNB, and if the DeNB finds that the RSRP reported by the mobile station is ranked from the top to the bottom of the RSRP.
  • the DeNB can use the OTDOA locating mode or the GNSS locating mode to locate the mobile station without reporting the measurement result to the E-SMLC, but directly notify the service application entity of the obtained mobile station geographical location. This shortens the signaling interaction time of positioning and enhances reliability.
  • the mobile station can be directly located by using the CID positioning method.
  • the mobile station can report the ID of the RN to the DeNB, and the DeNB obtains the geographical location of the mobile station according to the ID of the RN, and notifies the service application entity.
  • FIG. 4 is a schematic flowchart diagram of a mobile station positioning method in a heterogeneous network according to an embodiment of the present invention. In the positioning method shown in FIG.
  • the positioning method may include the following steps:
  • the mobile station initiates a location request message to the MME;
  • the MME transparently transmits the location request request to the E-SMLC, where the location request request carries the CGI of the mobile station's home cell.
  • the E-SMLC determines, according to the CGI of the mobile station's home cell, that the mobile station's home cell is a macro cell (ie, the mobile station is a macro cell user), and sends a request capability message request capability to the mobile station.
  • the mobile station will support the GNSS positioning function and the OTDOA positioning function to the E-SMLC;
  • the E-SMLC triggers the GNSS to send a positioning reference signal to the mobile station, and the E-SMLC detects that there is an LPN around the mobile station; the E-SMLC and the mobile station perform an auxiliary data interaction data interaction; the E-SMLC waits for the mobile station to report Measurement result
  • the purpose of the auxiliary data interaction data exchange between the E-SMLC and the mobile station is to send the GNSS positioning reference signal configuration information to the mobile station, so that the mobile station receives the GNSS transmission within the specified time of the positioning reference signal configuration information.
  • the reference signal is located, and the time value (ie, the measurement result) of the positioning reference signal received by the GNSS is reported.
  • the E-SMLC cannot obtain the measurement result of the mobile station in the time interval T, and the E-SMLC sends the signaling OTDOA-Request Neighbor SNR to the mobile station by the MME, and requests the mobile station to report the RSRP of the LPN; accordingly, the mobile station passes The MME reports the signaling OTDOA-Neighbor SNR Response to the E-SMLC, so that the E-SMLC learns the RSRP of the LPN.
  • the following signaling procedures can be used between the E-SMLC and the mobile station to enable the E-SMLC to learn the RSRP of the LPN, namely: - ASN1 START
  • the E-SMLC obtains the interference level SNR of the LPN to the mobile station according to the RSRP reported by the MME, and finds that the interference level value SNR of the LPN to the mobile station is greater than a preset interference level threshold SNR_LPN, and the E-SMLC needs to notify the LPN. Participate in OTDOA positioning.
  • the E-SMLC sends the assistance data to the base station (such as the macro base station), the LPN, and the mobile station, and the RSTD reported by the mobile station, and uses the positioning algorithm to calculate the geographic location of the mobile station on the base of the RSTD. .
  • the E-SMLC sends the auxiliary data to the base station around the mobile station for the purpose of interacting with the base station around the mobile station to obtain the positioning reference signal and the transmission timing configuration of the base station around the mobile station; the E-SMLC sends the auxiliary data assistance to the LPN.
  • the purpose of the data is to locate the reference signal and the transmission timing configuration for the LPN; and the E-SMLC sends the auxiliary data of the assistance data to the mobile station to transmit the positioning reference signal and the transmission timing configuration of the base station around the mobile station to the mobile station.
  • the mobile station receives the positioning reference signal of the base station and the LPN around the mobile station and reports the RSTD to the E-SMLC within a predetermined time.
  • the E-SMLC calculates the geographical position of the mobile station by using the positioning algorithm on the basis of the RSTD.
  • the LPN is an RN
  • the assistance data sent by the E-SMLC needs to be To be forwarded to the RN through the DeNB, the DeNB and the RN are linked through the Un port. Since the assistance data is non-UE-assisted, but the roxy requirement for the DeNB is mandatory, the IE must be forwarded to the corresponding The RN, whose IE content can reuse the IE received by the DeNB.
  • FIG. 5 is a schematic flowchart of a method for locating a mobile station in a heterogeneous network according to an embodiment of the present invention.
  • a mobile station is a user in an RRC-Connected state in a certain LPN cell, and the mobile station is located inside the building, and has a built-in GNSS positioning function but is not available;
  • the PRS delivered by the surrounding base station (such as the macro base station) is interfered by the data signal from the LPN.
  • the positioning method can include the following steps:
  • the mobile station initiates a location request message to the MME;
  • the MME transparently transmits the location request request to the E-SMLC, where the location request request carries the CGI of the mobile station's home cell.
  • the E-SMLC determines, according to the CGI of the mobile station's home cell, that the mobile station's home cell is an LPN cell (ie, the mobile station is an LPN cell user), and the E-SMLC requests the LPN to report its coverage radius, and determines whether the coverage radius is less than or Equal to the radius threshold value R_LPN that satisfies the positioning accuracy;
  • the E-SMLC determines that the LPN coverage radius is greater than a radius threshold R LPN that satisfies the positioning accuracy, and sends a request capability message to the mobile station.
  • the E-SMLC may send a request to the LPN, and the LPN obtains the LPN coverage radius from the stored mapping relationship of the similar table 1 according to its self-transmitting power level, and reports it to the E-SMLC.
  • the mobile station will support the GNSS positioning function and the OTDOA positioning function to the E-SMLC;
  • the E-SMLC triggers the GNSS to send a positioning reference signal to the mobile station, and the auxiliary data assistance data interaction between the E-SMLC and the mobile station; the E-SMLC waits for the mobile station to report the measurement result;
  • the purpose of the auxiliary data interaction data exchange between the E-SMLC and the mobile station is to send the positioning reference signal configuration information of the GNSS to the mobile station, so that the mobile station determines
  • the bit reference signal configuration information receives the positioning reference signal transmitted by the GNSS within a specified time, and reports the time value (ie, the measurement result) of the positioning reference signal received by the GNSS.
  • the E-SMLC cannot obtain the measurement result of the mobile station within the time interval T;
  • the E-SMLC sends the assistance data to the base station (such as the macro base station), the LPN, and the mobile station, and the RSTD reported by the mobile station, and uses the positioning algorithm to calculate the geographic location of the mobile station on the basis of the RSTD. .
  • the E-SMLC sends the assistance data to the base station around the mobile station for the purpose of interacting with the base station around the mobile station to obtain the positioning reference signal and the transmission timing configuration of the base station around the mobile station; the E-SMLC sends the assistance to the LPN.
  • the purpose of the data attenuation data is to locate the reference signal and the transmission timing configuration for the LPN; and the E-SMLC sends the auxiliary data to the mobile station for the purpose of transmitting the positioning reference signal and the transmission timing configuration of the base station around the mobile station and the LPN.
  • the mobile station receives the positioning reference signal of the base station and the LPN around the mobile station and reports the RSTD to the E-SMLC within a predetermined time.
  • the E-SMLC calculates the geographical position of the mobile station by using the positioning algorithm on the basis of the RSTD.
  • FIG. 6 is a schematic flowchart of a method for locating a mobile station in a heterogeneous network according to an embodiment of the present invention.
  • a mobile station is a user in an RRC-Connected state in a certain DeNB cell, and the mobile station is located inside the building, and has a built-in GNSS positioning function but is not available;
  • the base stations are all RNs of the DeNB.
  • the cells with large RSRP measured on the mobile station side are the DeNB cells and their subordinate RN cells.
  • the positioning method may include the following steps:
  • the mobile station measures RSRP of the neighboring cell, and the measured RSRP is sorted by size, and the first n bits are DeNBs or RNs of the subordinates (n is greater than 3);
  • the mobile station initiates a location service request to the DeNB.
  • the mobile station does not directly send the Location service request to the MME, because the DeNB can perform positioning for the mobile station in conjunction with several RNs of the subordinate, and does not require the E-SMLC to locate the mobile station;
  • the DeNB sends a request capability to the mobile station.
  • the mobile station will support the GNSS positioning function and the OTDOA positioning function.
  • DeNB DeNB
  • the DeNB triggers the GNSS to send a positioning reference signal to the mobile station, and the DeNB performs an auxiliary data interaction data interaction with the mobile station.
  • the DeNB waits for the mobile station to report the measurement result.
  • the DeNB and the mobile station perform the purpose of the auxiliary data interaction data interaction.
  • the GNSS positioning reference signal configuration information is sent to the mobile station, so that the mobile station receives the positioning reference signal sent by the GNSS within the specified time of the positioning reference signal configuration information, and reports the time value of the positioning reference signal received by the GNSS (ie, Measurement results).
  • the DeNB cannot obtain the measurement result of the mobile station in the time interval T.
  • the DeNB sends the assistance data assistance data to the RN and the mobile station of the subordinate, and receives the RSTD reported by the mobile station, and uses the positioning algorithm to calculate the geographic location of the mobile station on the basis of the RSTD.
  • the DeNB sends the assistance data to the subordinate RN to interact with the RN to obtain the positioning reference signal and the transmission timing configuration of the RN.
  • the DeNB sends the auxiliary data to the mobile station.
  • the mobile station receives the positioning reference signal of the RN and reports the RSTD to the DeNB within a predetermined time, and the DeNB calculates the geographical of the mobile station by using the positioning algorithm on the basis of the RSTD. position.
  • FIG. 7 is a schematic structural diagram of a mobile station positioning device in a heterogeneous network according to an embodiment of the present invention.
  • the positioning device may be a stand-alone device, or part of a new extension of the E-SMLC, or as part of a new extension of the DeNB, for accurately positioning the mobile station in a heterogeneous network.
  • the embodiment of the invention is not limited. As shown in Figure 7, the positioning device can include:
  • the receiving unit 701 is configured to receive a positioning request message sent by the mobile station by using the MME or the RN, where the positioning request message carries the cell identifier of the mobile station's home cell.
  • the receiving unit 701 can receive the mobile station through the MME positioning request message; if the positioning device shown in FIG. 7 is used as When a part of the new extension of the DeNB, the receiving unit 701 can receive the mobile station through the RN positioning request message.
  • the cell identity of the mobile station's home cell may be represented by the CGI of the home cell.
  • the first determining unit 702 is configured to determine, according to the cell identifier, a cell type of the home cell, where the cell type of the home cell is an LPN cell or a macro cell;
  • the first determining unit 703 is configured to determine, when the first determining unit 702 determines that the cell type of the home cell is an LPN cell, whether the coverage radius of the home cell is less than or equal to a radius threshold that satisfies the positioning accuracy, and if yes, the attribution
  • the cell identity of the cell is used as the geographic location identifier of the mobile station.
  • the first determining unit 703 may include:
  • the first module 7031 is configured to: when the first determining unit 702 determines that the cell type of the home cell is an LPN cell, send an LPN that requests to report the coverage information to the LPN cell, and receive the coverage information reported by the LPN, where the coverage information carries The coverage radius of the home cell;
  • the second module 7032 is configured to determine, according to the coverage information reported by the LPN, whether the coverage radius of the home cell is less than or equal to a radius threshold that satisfies the positioning accuracy, and if yes, use the cell identifier of the home cell as the geographic location identifier of the mobile station.
  • the coverage radius of the home cell is obtained by the LPN according to its own transmit power level, from the mapping table of its own transmit power level and coverage radius (as shown in Table 1).
  • the embodiment of the present invention can perform accurate positioning of the mobile station by using a positioning mode (ie, CID positioning) in a homogeneous network in a heterogeneous network composed of a macro cell and an LPN cell.
  • a positioning mode ie, CID positioning
  • FIG. 8 is a schematic structural diagram of a mobile station positioning device in another heterogeneous network according to an embodiment of the present invention.
  • the positioning device shown in FIG. 8 is optimized by the positioning device shown in FIG. 7.
  • the positioning device may further include:
  • a second determining unit 704 configured to determine, in the first determining unit 702, a cell class of the home cell The type is an LPN cell, and when the determination result of the first determining unit 703 is NO, it is determined whether the mobile station has the GNSS system positioning function;
  • the first control unit 705 is configured to: when the second determining unit 704 determines that the mobile station has the GNSS positioning function, trigger the GNSS to send the positioning reference signal to the mobile station;
  • the second determining unit 706 is configured to determine whether the measurement result reported by the mobile station is received within a preset time interval T, and the measurement result is a time value that the mobile station receives the positioning reference signal sent by the GNSS;
  • the first calculating unit 707 is configured to calculate a geographic location of the mobile station by using a positioning algorithm on the basis of the time value when the determination result of the second determining unit 706 is YES.
  • the structure of the first judging unit 703 in the locating device shown in FIG. 8 is the same as that of FIG. 7, and is not repeated in the embodiment of the present invention.
  • the second determining unit 704 may include:
  • a third module 7041 configured to send a request capability message to the mobile station, where the request capability message is used to query a positioning mode supported by the mobile station;
  • the fourth module 7042 is configured to receive a request capability response message reported by the mobile station, and determine, by the positioning manner carried in the request capability response message, whether the mobile station has the GNSS positioning function.
  • the first control unit 705 can include:
  • the fifth module 7051 is configured to perform signaling interaction with the GNSS to obtain positioning information configuration information of the GNSS.
  • the sixth module 7052 is configured to send the positioning reference signal configuration information to the mobile station, so that the mobile station receives the positioning reference signal sent by the GNSS within the specified time of the positioning reference signal configuration information, and receives the positioning reference signal of the GNSS. Time value.
  • FIG. 9 is a schematic structural diagram of a mobile station positioning device in another heterogeneous network according to an embodiment of the present invention.
  • the positioning device shown in FIG. 9 is optimized by the positioning device shown in FIG. 8.
  • the positioning device may further include a first positioning unit 708, in addition to the units including the positioning device shown in FIG.
  • the first positioning unit 708 may include: a seventh module 7081, configured to determine, in the second determining unit 704, that the mobile station does not have the GNS S positioning function, or when the determination result of the second determining unit 706 is negative, to the LPN
  • the LPN of the cell and the base station around the mobile station respectively send notification messages participating in the positioning of the mobile station, and locate the LPN a reference signal and a transmission timing configuration, and interacting with a base station around the mobile station to obtain a positioning reference signal and a transmission timing configuration of the base station around the mobile station;
  • the eighth module 7082 is configured to send the positioning reference signal and the transmission timing configuration information of the LPN to the mobile station, and send the positioning reference signal and the transmission timing configuration of the base station around the mobile station to the mobile station; and receive the RSTD reported by the mobile station,
  • the location algorithm is used to calculate the geographic location of the mobile station based on the RSTD; wherein, the RSTD is the time difference of the two adjacent positioning reference signals received by the mobile station.
  • the configuration of the second judging unit 704 and the first control unit 705 in the locating device shown in FIG. 9 may be the same as that of FIG. 8 and will not be repeated in the embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another mobile station positioning device in a heterogeneous network according to an embodiment of the present invention.
  • the positioning device shown in FIG. 10 is optimized by the positioning device shown in FIG. 9.
  • the positioning device may further include:
  • the third determining unit 709 is configured to determine, when the first determining unit 701 determines that the cell type of the home cell is a macro cell, whether the mobile station has the GNSS positioning function;
  • the second control unit 710 is configured to: when the third determining unit 709 determines that the mobile station has the GNSS positioning function, trigger the GNSS to send the positioning reference signal to the mobile station;
  • the third determining unit 711 is configured to determine whether the measurement result reported by the mobile station is received within a preset time interval T, where the measurement result is a time value that the mobile station receives the positioning reference signal sent by the GNSS;
  • the second calculating unit 712 is configured to calculate a geographic location of the mobile station by using a positioning algorithm on the basis of the time value when the determination result of the third determining unit 711 is YES.
  • the positioning device may further include a second positioning unit 713, wherein the second positioning unit 713 may include:
  • the ninth module 7131 is configured to determine, in the third determining unit 709, that the mobile station does not have the GNSS positioning function, or when the determination result of the third determining unit 711 is negative, determine whether the interference level value of the LPN to the mobile station is greater than a preset. Interference level threshold;
  • the tenth module 7132 is configured to: when the determination result of the ninth module 7131 is YES, send a notification message for participating in the positioning of the mobile station to the LPN and the base station surrounding the mobile station, and perform positioning for the LPN. Coding signal and transmission timing configuration, and interacting with a base station around the mobile station to obtain a positioning reference signal and a transmission timing configuration of the base station around the mobile station; transmitting the positioning reference signal and transmission timing configuration information of the LPN to the mobile station, and The positioning reference signal and the transmission timing configuration of the base station around the mobile station are sent to the mobile station; and the RSTD reported by the mobile station is received, and the geographic location of the mobile station is calculated by using the positioning algorithm based on the RSTD; wherein the RSTD is received by the mobile station The time difference between two adjacent positioning reference signals.
  • the second positioning unit 713 may further include:
  • the eleventh module 7133 is configured to: when the determining structure of the ninth module 7131 is negative, send a notification message participating in the positioning of the mobile station to the base station surrounding the mobile station, and interact with the base station around the mobile station to obtain a positioning reference of the base station around the mobile station. Signal and transmission timing configuration; and transmitting a positioning reference signal and a transmission timing configuration of the base station around the mobile station to the mobile station; and receiving the RSTD reported by the mobile station, and calculating a geographical position of the mobile station by using a positioning algorithm on the basis of the RSTD;
  • the RSTD is a time difference of two adjacent positioning reference signals received by the mobile station.
  • the structure of the first positioning unit 708 can be the same as that of FIG. 9 in the positioning device shown in FIG. 10, which is not repeated in the embodiment of the present invention.
  • the positioning device provided by the embodiment of the present invention can accurately locate the mobile station by using the GNSS positioning mode, the CID positioning mode, or the OTDOA positioning mode in the homogeneous network in the heterogeneous network.
  • the program can be stored in a computer readable storage medium.
  • the storage medium can include: Flash disk, read-only memory (ROM), random access memory (RAM), disk or optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les modes de réalisation de la présente invention concernent le domaine technique des communications. Un procédé et un dispositif de localisation de station mobile dans un réseau hétérogène sont décrits. Le procédé consiste à : recevoir un message de requête de localisation envoyé par une station mobile par l'intermédiaire d'une entité de gestion de mobilité ou d'un nœud relais, le message de requête de localisation contenant au moins l'identificateur de cellule d'une cellule à laquelle la station mobile appartient ; déterminer le type de cellule de la cellule à laquelle la station mobile appartient conformément à l'identificateur de cellule, le type de cellule de la cellule à laquelle la station mobile appartient étant une cellule de nœud basse puissance ou une macrocellule ; et si le type de cellule de la cellule à laquelle la station mobile appartient est une cellule de nœud basse puissance, déterminer si le rayon de couverture de la cellule d'appartenance est inférieur ou égal à une valeur seuil de rayon qui satisfait une précision de localisation, et si tel est le cas, alors considérer l'identificateur de cellule de la cellule d'appartenance à titre d'identificateur de position géographique de la station mobile. Les modes de réalisation de la présente invention peuvent localiser précisément une station mobile en continuant à utiliser, dans un réseau hétérogène, le procédé de localisation utilisé dans le réseau homogène.
PCT/CN2012/079000 2011-07-22 2012-07-23 Procédé et dispositif de localisation de station mobile dans un réseau hétérogène WO2013013604A1 (fr)

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CN104486724A (zh) * 2014-12-15 2015-04-01 江苏国遥信息科技有限公司 一种地震救援人员自适应定位及通讯方法
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