CN1787679B - A positioning method for a radio network controller to determine a user equipment to be positioned - Google Patents

Abstract

A radio network controller determines a positioning method for a user equipment to be positioned, comprising steps: RNC starts measuring the loop delay of the UE to be positioned; Node B measures the angle of arrival of the UE; RNC sets a threshold value; when the UE to be positioned When the measured value of the loop delay is smaller than the preset threshold, the RNC locates the user equipment according to the values of the loop delay and the angle of arrival. According to the method of the present invention, the RNC comprehensively processes multiple possible positioning methods, thereby determining a suitable positioning method for the user equipment (UE) to be positioned in any position in the cell, and avoiding that a single positioning method cannot be applied to the coverage of the cell For problems in all areas in the cell, ensure that the positioning method that meets the accuracy requirements or the best positioning method performs positioning on the UE to be positioned at any position in the cell.

Description

A positioning method for a radio network controller to determine a user equipment to be positioned

technical field

The present invention relates to a third generation mobile communication system, and more specifically relates to a positioning method for a radio network controller (RNC) to determine a user equipment (UE) to be positioned.

Background technique

In the existing 3GPP technical specifications, three positioning methods are defined, namely Cell-ID, Observed Time Difference of Arrival (OTDOA) and Assisted Global Positioning System (A-GPS), among which the Cell-ID method is The identity of the cell (Cell) in the Node B where the positioned user equipment (UE) is located is reported to the core network (CN) as the location of the positioned user equipment, which is characterized in that the location information can be obtained without calculation, so Simple and low positioning accuracy, its positioning accuracy is generally several hundred meters to several thousand meters, depending on the cell radius designed by the cellular network; the observed time difference of arrival (OTDOA) method of the user equipment measures the signals sent from at least three Node Bs The time difference of arrival at the UE under test is used to calculate the position of the UE under test, and its accuracy is generally within a few hundred meters, depending on the signal bandwidth, multipath in the wireless propagation environment, available measurements, etc.; The assisted global positioning system (A-GPS) positioning method is to combine the global positioning system receiver with the user equipment, and use the relevant parameters of the satellite in the global positioning system provided by the cellular network to accelerate the start-up and The user equipment (UE) positioning is implemented by searching, which is characterized by relatively high positioning accuracy, generally within tens of meters, but the cost is relatively high.

The LCR-TDD system is a low chip rate time division duplex code division multiple access (LCR-TDD CDMA) system, and 3GPP has formulated corresponding technical specifications for the LCR-TDD code division multiple access. The LCR-TDD CDMA system will be able to be installed at Node B using Smart Antennas (SA). A smart antenna (SA) is an antenna array composed of multiple low-gain antenna elements. It uses digital signal processing technology to implement beamforming on multiple different users to generate multiple different spatial beams. The maximum direction of each beam automatically aligns Align the respective users, and align the zero receiving direction with the interference direction to suppress co-channel interference, multiple access interference and multipath fading, so as to achieve the purpose of significantly improving the signal-to-interference ratio and enhancing the system capacity.

Since the smart antenna uses an array antenna with a different number of array elements in a certain spatial position, the same radio signal arrives at each array element with different wave path differences, and signals in different directions produce different array responses after being beam-formed by the array antenna, so the wave length can be estimated. angle of arrival (AOA). The smart antenna receiving system can adopt different algorithms, which can be implemented in radio frequency, intermediate frequency or baseband respectively, so as to distinguish signals from different directions, thereby reducing interference and improving system performance.

In the LCR-TDD system, the OTDOA measurement calculates the position of the user equipment under test (UE) by calculating the time difference of the DwPTS signals sent from at least three Node Bs arriving at the user equipment under test (UE). Since the user equipment (UE) to be positioned in the serving cell is relatively close to the serving cell and relatively far away from the neighboring cells, this means that the DwPTS signal received from the serving cell is stronger than the DwPTS signal from the neighboring cell, resulting in the UE to be positioned ( UE) cannot receive the DwPTS signal sent by a cell that is relatively far away from the neighbor. In order to deal with the above-mentioned problem of detection of neighboring cells by a user equipment (UE) to be located, several feasible solutions have been proposed. First, the idle period downlink (IPDL) transmission technology can be used, that is, the serving cell temporarily stops transmitting its DwPTS signal in some specific radio frames, and the adjacent cell normally transmits the DwPTS signal, so that the adjacent cell that the UE to be located can detect The increased number of DwPTS signals improves the measurement accuracy and thus the positioning accuracy. Secondly, the positioning measurement unit or the position calculation entity can use technologies such as interference cancellation to process the superimposed signals received by the user equipment (UE) from the serving cell and its adjacent cells. Extract the DwPTS signal of the strongest cell (generally its serving cell) from the signal received by the equipment (UE), and then remove the DwPTS signal component of the strongest cell from the signal received by the positioning user equipment (UE); then in the remaining Extract the DwPTS signal of the second strongest cell from the signal, and then remove the DwPTS signal component of the second strongest cell; in this way, the influence of the DwPTS signal of the cell with the strongest current signal is deleted in turn, so as to extract as much DwPTS of the cell with weaker signal as possible Signal. In addition to the above techniques, there are other techniques for dealing with the problem that the UE to be located cannot receive the DwPTS signal sent by a relatively far away cell. However, the above techniques cannot completely solve this problem, that is, in some In a specific area, the number of adjacent cells that can be detected by the user equipment (UE) to be located may still not meet the requirements of OTDOA positioning. For example, for IPDL technology, such an area is near the edge of the serving cell; for interference cancellation technology, Such an area is in the vicinity of the center of the cell.

Cambridge Positioning Systems has done a lot of research and testing on the performance of the above-mentioned several solutions, and these results are reflected in the "Aural Analysis of OTDOA Positioning Methods in 3G UMTS Networks" published by David Bartlett. The basic OTDOA positioning method does not have enough available cells in about 26% of the area for the reported parameter configuration; when using IPDL technology, the OTDOA positioning method does not have enough available cells in about 6% of the area to complete the positioning; and when the technology of interference cancellation is adopted, the OTDOA positioning method does not have enough available cells to complete the positioning in about 5% of the areas.

The above report shows that although IPDL technology or interference cancellation technology has improved the problem of receiving DwPTS signals sent by adjacent cells in the OTDOA positioning method in the OTDOA positioning method, in some special areas, the UE to be positioned ( The number of DwPTS signals sent by neighboring cells that the UE can receive still cannot meet the requirements of the OTDOA positioning method, and the RNC must select other positioning methods to perform positioning on the UE. According to some measurement values defined in the existing 3GPP technical specifications at the UE or at the Node B, the RNC can start some relatively simple methods for positioning the UE to be positioned. The round-trip time delay (RTT) and angle of arrival (AOA) of the UE, and then obtain the location estimation of the UE to be positioned. In addition, the RNC can also adopt some mixed methods to obtain measured values as much as possible. For example, after the RNC obtains the round-trip time delay (RTT) and angle of arrival (AOA) of the UE to be positioned, the RNC can combine the UE to be positioned The measured OTDOA measurements enable an increase in positioning accuracy.

In the LCR-TDD system, in order to realize the measurement of the loop time delay (RTT) of the UE to be positioned, the RNC can request the Node B to measure the time deviation of the UE to be positioned through the special measurement message of the Iub interface respectively, and through the Uu interface RRC signaling ( Measurement control message) requests the UE to be positioned to measure its timing advance; then the RNC synthesizes the time offset and timing advance of the UE to be positioned to calculate the loop time delay (RTT) of the UE to be positioned.

In the existing 3GPP technical specifications, a positioning method based on Observed Time Difference of Arrival (OTDOA) is defined. This method has the problem that the user equipment (UE) to be positioned cannot receive the DwPTS signal sent by a relatively far away cell. Technologies such as IPDL and interference cancellation have improved the application area of OTDOA technology to a certain extent, but there are still some areas where the number of cells that can be used for OTDOA positioning method is less than 3, so that RNC cannot only rely on OTDOA positioning method to obtain the UE to be located s position.

In the existing 3GPP technical specification, for the positioning method of OTDOA, the above technical specification does not define how the RNC selects the user equipment (UE) to be positioned to send the cell that needs to be measured by the UE to be positioned so that the user equipment to be positioned can be sent to the user to be positioned through a broadcast message or a measurement control message The device (UE) sends a list of cells that need to be measured by the UE to be located. One of the most direct implementations is that the above-mentioned cell list generally includes the serving cell of the UE to be positioned and all its neighboring cells, and the UE to be positioned needs to perform OTDOA measurement on all the cells in the list. This method has such a problem , that is, when the number of cells available for the OTDOA positioning method is relatively small, the UE to be positioned performs many useless measurement operations, resulting in waste of battery power and processing resources.

In the LCR-TDD system, in order to measure the loop time delay (RTT) of the UE to be located, the RNC can request the Node B to measure the time offset of the UE to be located through the dedicated measurement message of the Iub interface, and the RRC signaling request to be located through the Uu interface UE measures its timing advance. In the existing 3GPP technical specifications, the special measurement message sent by the RNC to the Node B includes a connection frame number (CFN), which is used to set the time deviation of the Node B to measure the UE to be positioned in a specific radio frame; at the same time, The Node B's response message to the RNC-specific measurement message also includes the information element CFN, and the Node B reports through this information element that the time offset measured by the RNC is the measurement value for that radio frame. In the existing 3GPP technical specifications, the UE to be positioned includes the information element SFN in the response message and the measurement report message to the RNC measurement control message, and the UE to be positioned reports the timing advance of the RNC measurement through this information element for which radio frame However, the measurement control message sent by the RNC to the UE to be positioned does not contain the information element about the SFN, that is, the RNC cannot control the UE to be positioned to measure and report the timing advance of the specified radio frame. Therefore, the RNC cannot synchronize the measurement of the time deviation and the measurement of the time advance. Although the RNC can take other measures to make the measurement time deviation as small as possible, it still causes a certain loss in measurement accuracy.

Contents of the invention

The purpose of the present invention is to provide a method for RNC to determine positioning for a UE to be positioned in any position in a cell.

According to an aspect of the present invention, a positioning method for a radio network controller to determine a user equipment to be located includes steps:

a) The RNC starts measuring the loop delay of the UE to be positioned;

b) Node B measures the angle of arrival of UE;

c) RNC sets the threshold value;

d) When the measured value of the loop delay of the UE to be located is smaller than the preset threshold, the RNC locates the user equipment according to the value of the loop delay and the angle of arrival.

According to the method of the present invention, the RNC comprehensively processes multiple possible positioning methods, thereby determining a suitable positioning method for the user equipment (UE) to be positioned in any position in the cell, and avoiding that a single positioning method cannot be applied to the coverage of the cell For problems in all areas within the cell, ensure that the positioning method that meets the accuracy requirements or the best positioning method performs positioning on the UE to be positioned at any position in the cell.

Description of drawings

Fig. 1 is a structural diagram of implementing positioning services in the present invention;

FIG. 2 is a schematic diagram of positioning a user equipment (UE) to be positioned in an LCR-TDD system;

Fig. 3 is the implementation flow chart of a positioning method based on loop time delay and propagation loss of the present invention;

Fig. 4 is an implementation flowchart of another method for determining positioning based on propagation loss in the present invention.

Detailed ways

Fig. 1 is the structural diagram of implementing positioning service proposed by the present invention, which includes core network (CN) 104, radio network controller (RNC) 103, Node B 102, user equipment (UE) 101, and smart antenna is configured on NodeB 105. The core network 104 communicates with the radio network controller 103 via the interface Iu113, the radio network controller 103 communicates with the Node B 102 via the interface Iub 112, and the user equipment 105 communicates with the wireless network via the interface Uu111. User equipment 101 includes timing advance measurement module 1011, propagation loss measurement module 1012, OTDOA measurement module 1013; Node B includes angle of arrival (AOA) measurement module 1021, time deviation measurement module 1022; RNC includes positioning method decision module 1031 and positioning result The calculation module 1032 and so on, wherein the positioning method determination module 1031 is used to determine the method adopted for implementing positioning, and the positioning result calculation module 1032 is used to calculate the position according to the positioning measurement value.

Fig. 2 is a schematic diagram of network positioning of a user equipment (UE) to be positioned in an LCR-TDD system. The UE to be positioned (207) is located within the coverage of the serving cell (200), and the distances R1-R6 (211-216) from the six neighboring cells are relatively far away, and the distances to the six neighboring cells are also different. Considering the complex wireless propagation environment, the path losses L1-L6 (211-216) of the six adjacent cells to the UE to be positioned (207) are more complicated. In different areas within the coverage of the serving cell, the number of neighboring cells that the UE to be positioned can detect is generally different.

Aiming at the problem that the existing OTDOA positioning method and its improved algorithm still cannot be guaranteed to be applicable to all areas within the coverage of the cell, the present invention proposes a mechanism for the RNC to comprehensively process multiple positioning methods, so as to be located at any position in the cell The user equipment (UE) decides an appropriate positioning method to ensure that the positioning method that meets the accuracy requirements or the best positioning method performs positioning on the UE to be positioned at any position in the cell, that is, the RNC uses the known information about the UE to be positioned The information of the neighboring cells or requesting the UE to be positioned to measure the parameters of its neighboring cells, and to select a suitable positioning method and its parameters for the UE to be positioned. The parameters that can be used as the basis for the RNC to select the positioning method include: the link between the UE to be positioned and its serving cell The path time delay (RTT), the propagation loss from the UE to be located to its neighboring cells, etc.

When the RNC uses the RTT measurement value as the basis for selecting a positioning method, the RNC compares the RTT measurement value with a certain set threshold value to select an appropriate positioning method. The setting of the above preset threshold should be combined with the specific geographical environment of the cell and Reasonable selection of system configuration, that is, when the RTT is less than the threshold, the UE to be located is closer to the center of the cell, and the RNC mainly calculates the position of the UE to be located based on RTT and AOA; when the RTT is greater than the threshold, the UE to be located is far from the center of the cell, and the RNC The OTDOA measurement and positioning method can be selected to calculate the position of the UE to be located.

When the RNC uses the propagation loss from the UE to be located to each neighboring cell as the basis for selecting the positioning method, the RNC judges those neighboring cells that can be used for OTDOA measurement and positioning methods based on certain thresholds and criteria, and removes neighboring cells that do not meet the requirements. , that is, when RNC detects that there is only one adjacent cell (serving cell) that can be used in OTDOA measurement and positioning methods, RNC implements positioning according to loop time delay (RTT) and angle of arrival (AOA); when RNC detects that it can be used in OTDOA measurement When there are two adjacent cells (serving cell and one adjacent cell) in the positioning method, the RNC implements positioning according to the loop time delay (RTT), angle of arrival (AOA) and available OTDOA measurement values; when the RNC detects that the OTDOA When the number of adjacent cells in the measurement and positioning method is greater than or equal to 3, the RNC uses the OTDOA positioning method to perform positioning, and can choose RTT and AOA as methods to improve accuracy.

In the OTDOA positioning method of the present invention for the existing 3GPP specifications, the list of cells that the RNC sends to the user equipment (UE) through the RRC signaling measurement control message and requires the UE to be positioned to perform OTDOA measurement generally includes a plurality of cells, some of which The cell may not meet the OTDOA measurement requirements of the UE to be located, resulting in the waste of wireless network resources and the resources of the UE to be located. The RNC proposes that the RNC may request the UE to measure The parameters of its neighboring cells are selected according to a certain criterion, and the cells that can provide better OTDOA measurement and positioning method accuracy are put into the cell list, which improves the performance.

In the existing 3GPP technical specifications, the UE's measurement of the timing advance is defined as a UE internal measurement value. For the measurement control message sent by the RNC to the UE to be positioned does not contain the information unit about the radio frame SFN, that is, the RNC cannot control the UE to be positioned to measure the timing advance of the specified radio frame, the present invention is for the UE internal measurement report in 3GPP 25.331 The criterion message unit is extended, so as to support the RNC to control the timing advance of the UE to be positioned to measure the specified radio frame. Specifically:

1) A new type of event is added to the trigger event of the UE internal measurement reporting criterion message unit. This event is only valid for measuring the UE timing advance in the LCR-TDD system, that is, event 6h, which measures the time advance in the LCR-TDD system. The time advance of UE in a specified radio frame and report to RNC;

2) Add a new parameter in the parameter list of the UE internal measurement reporting criteria message unit, that is, the system frame number (SFN) of the radio frame that requires the UE to measure the timing advance;

Through the above signaling extension, when the RNC of the LCR-TDD system measures the RTT of the UE to be located, the RNC can request the Node B to measure the time offset of the UE to be located through the dedicated measurement message of the Iub interface, and the RRC signaling request through the Uu interface is pending bit UE measurement timing advance. In order to realize the simultaneous measurement of the time offset and timing advance of the UE to be located, the dedicated measurement message sent by the RNC to the Node B contains the information unit CFN, which is used to set the Node B to measure the time offset of the UE to be located in a specified radio frame The RNC sends to the internal measurement message unit of the RRC signaling measurement control message of the UE to be positioned to set the event trigger report 6h, and includes the information element about the SFN, that is, the RNC controls the UE to measure the timing advance of the specified radio frame. In this way, the Node B and the UE to be positioned measure the specified radio frames respectively. The response message of the Node B to the RNC-specific measurement message includes the information unit CFN, and the response message and the measurement report message of the UE to be positioned to the RNC measurement control message include the information unit SFN, which are used to confirm that the reported measurement is for that radio frame Measurements.

Example

Fig. 3 is an implementation flowchart of the present invention based on loop delay and propagation loss to determine the location method, RNC receives the location request to certain user equipment (UE) from core network, and RNC starts the flow process of location method decision (300 ); RNC first starts to measure the loop time delay (RTT) and the angle of arrival (AOA) of UE to be positioned, in order to realize measuring RTT, RNC can request Node B to measure the time deviation of UE to be positioned by Iub interface special-purpose measurement message respectively, by The Uu interface RRC signaling requests the UE to be positioned to measure the timing advance, and then the RNC synthesizes the time deviation and the timing advance of the UE to be positioned to calculate the loop time delay RTT (301) of the UE to be positioned, and simultaneously the RNC passes the Iub interface The dedicated measurement message controls the Node B to measure the angle of arrival AOA (302) of the UE to be positioned; after obtaining the measured value of the RTT, the RNC can determine the transfer of the positioning method according to the measured value of the RTT and a certain threshold value (303), The setting of the above preset threshold should be reasonably selected in combination with the specific geographical environment of the cell and system configuration; in 303, when the measured RTT value is less than the preset threshold, it means that the UE to be located is relatively close to the center of the cell, and the basic OTDOA algorithm And the OTDOA algorithm using interference cancellation technology may not work near the center of the cell, but the positioning method based on the angle of arrival (AOA) can work better near the center of the cell, so in this area RNC can give priority to the positioning of RTT plus AOA method to implement positioning, the algorithm flow turns to 304, the RNC first sets the positioning calculation sign X, and then performs position calculation (304) for the user to be positioned according to the measured value of RTT and AOA; whether the RNC verifies that the positioning accuracy meets the accuracy requirement in the positioning request ( 305); in 305, when the RNC judges that the positioning accuracy of the UE to be positioned meets the accuracy requirements, the RNC reports the positioning result to the core network, and the process ends (316); in 305, the RNC judges that the positioning accuracy of the UE to be positioned cannot meet the accuracy requirements , turn to 307, and continue to measure more data; in 303, if the RTT measurement value is greater than the threshold value, it means that the UE to be positioned is far from the center of the cell, and the UE to be positioned is more likely to detect signals from more adjacent cells. RNC preferentially selects the positioning method based on OTDOA, and RNC first clears the positioning calculation sign X (306); then RNC starts UE to be positioned to measure the propagation loss of each adjacent cell (307); then RNC according to the propagation loss of each adjacent cell to UE to be positioned , based on certain thresholds and criteria, judge those neighboring cells that can be used in the OTDOA measurement and positioning method, and remove the neighboring cells that do not meet the requirements (308); in 308, when the RNC detects that the OTDOA measurement and positioning method can be used When the number of neighboring cells is less than 3, the RNC control process forwards to 309, and the RNC further selects a positioning method (309) according to the number of available cells; at 309 Among them, when RNC detects that there is only one adjacent cell (serving cell) that can be used in OTDOA measurement and positioning method, RNC judges whether the location calculation flag X is set (310); The loop time delay (RTT) and the angle of arrival (AOA) of the UE to be positioned calculate the position estimate of the UE to be positioned, corresponding to the situation where the RTT measurement value is less than the threshold, the RNC reports the positioning result to the core network, and the process ends (316); In 310, if the positioning calculation flag X is not set, it corresponds to the situation that the RTT measurement value is greater than the threshold, and the RNC performs position calculation for the UE to be located according to the measurement values of RTT and AOA (311); then the RNC reports the positioning result to the core network, and the process ends (316); in 309, when the RNC detects that there are two adjacent cells that can be used in OTDOA measurement and positioning methods (serving cell and one adjacent cell), the RNC requests the UE to be positioned to perform the measurement control message through the Uu interface RRC signaling OTDOA measurement, its neighbor cell list contains the neighbor cell that can be used for OTDOA measurement (312); then RNC performs position calculation (313) for the UE to be positioned according to RTT, AOA and the OTDOA measurement value of the available neighbor cell; then RNC reports the positioning result To the core network, the process ends (316); in 308, when the RNC detects that the number of adjacent cells that can be used in OTDOA measurement and positioning methods is greater than or equal to 3, the RNC control process forwards to 314, and the RNC measures by Uu interface RRC signaling The control message requests the UE to be positioned to perform OTDOA measurement, and its neighbor cell list includes those neighboring cells that can be used for OTDOA measurement (314); the UE to be positioned measures OTDOA and reports the measured value to the RNC, and the RNC performs location of the UE to be positioned according to the OTDOA measurement result Calculate, according to the requirement for accuracy from the positioning request of the core network, RNC can choose whether to use loop time delay (RTT) and angle of arrival (AOA) to enhance the positioning accuracy (315) of the OTDOA positioning method; then RNC reports the positioning result to the core net, the flow ends (316).

Fig. 4 is another flow chart of the present invention to determine the positioning method based on the propagation loss, the RNC receives a positioning request from the core network to a certain user equipment (UE), and the RNC starts the flow process (400) of the positioning method decision; the RNC first Start the UE to measure the propagation loss of each adjacent cell (401); then the RNC judges those adjacent cells that can be used for OTDOA measurement and positioning methods based on the propagation loss from each adjacent cell to the UE to be positioned based on certain thresholds and criteria, and simultaneously removes Adjacent cells that do not meet the requirements (402); in 402, when the RNC detects that the number of adjacent cells that can be used in OTDOA measurement and positioning methods is less than 3, the RNC control flow goes to 403, and then further selects the location according to the number of available cells Method (403); in 403, when RNC detects that there is only one (serving cell) in the neighboring cell that can be used in OTDOA measurement and positioning method, RNC starts measuring the loop time delay (RTT) and angle of arrival (AOA) of UE to be positioned ), in order to realize measuring RTT, RNC can request Node B to measure the time offset of UE to be positioned by Iub interface special-purpose measurement message respectively, request UE to be positioned by Uu interface RRC signaling to measure its timing advance amount, then RNC synthesizes the UE to be positioned Time deviation and time advance, calculate the loop time delay RTT (404) of this UE, and RNC controls Node B to measure the angle of arrival AOA (405) of UE to be positioned by the dedicated measurement message of Iub interface simultaneously; Then RNC according to RTT and The measurement value of AOA carries out position calculation (406) to the UE to be positioned; Then RNC reports positioning result to core network, and flow process ends (413); (serving cell and a neighboring cell), the RNC starts to measure the loop time delay (RTT) and angle of arrival (AOA) of the UE to be positioned, and starts the OTDOA measurement operation for the available cell at the same time. In order to measure the RTT, the RNC can respectively pass The dedicated measurement message of the Iub interface requests the Node B to measure the time offset of the UE to be located, and requests the UE to be located to measure the timing advance through the RRC signaling of the Uu interface, and then the RNC calculates the time offset of the UE based on the time offset of the UE and the timing advance of the UE. Loop time delay RTT (407), while RNC controls Node B to measure the angle of arrival AOA (408) of UE to be positioned by the dedicated measurement message of Iub interface, simultaneously RNC requests UE to perform OTDOA measurement by Uu interface RRC signaling measurement control message, Its neighboring cell list includes that neighboring cell that can be used for OTDOA measurement (409); then RNC performs position calculation (410) for the UE to be positioned according to RTT, AOA and the OTDOA measurement value of available neighboring cells; then RNC reports the positioning result to the core network , the process ends (413); in 402, when the RNC When it is detected that the number of adjacent cells that can be used in the OTDOA measurement and positioning method is greater than or equal to 3, the RNC control flow goes to 411, and the RNC requests the UE to be positioned to perform OTDOA measurement through the Uu interface RRC signaling measurement control message, and its list of adjacent cells contains Those adjacent cells that can be used for OTDOA measurement (411); UE measures OTDOA and reports the measured value to RNC, RNC calculates the position of the UE to be located according to the OTDOA measurement result, and according to the accuracy requirements of the positioning request, RNC can choose whether to start the measurement to be located The UE's round-trip time delay (RTT) and angle of arrival (AOA) are used to enhance the positioning accuracy of the OTDOA positioning method (412); then the RNC reports the positioning result to the core network, and the process ends (413).

According to the method of the present invention, the RNC comprehensively processes multiple possible positioning methods, thereby determining a suitable positioning method for the user equipment (UE) to be positioned in any position in the cell, and avoiding that a single positioning method cannot be applied to the coverage of the cell For problems in all areas within the cell, ensure that the positioning method that meets the accuracy requirements or the best positioning method performs positioning on the UE to be positioned at any position in the cell.

According to the method of the present invention, the RNC can effectively decide to select the user equipment (UE) to be positioned to send the information that needs to be measured by the UE to be positioned according to the known information about the neighboring cells of the UE to be positioned or to request the UE to be positioned to measure the parameters of the neighboring cells. The cell is used to send the list of cells that need to be measured by the UE to be positioned to the user equipment (UE) through a broadcast message or a measurement control message, so as to avoid the consumption of system resources by including some cells that cannot meet the OTDOA measurement requirements in the cell list.

According to the method of the present invention, the RNC in the LCR-TDD system can synchronize the measurement of the time deviation of the UE to be positioned by the Node B and the measurement of the time advance of the UE to be positioned by the UE when measuring the loop time delay (RTT), and then pass A more effective RTT measurement value is obtained by combining the time deviation and the time advance. In order to realize the simultaneous measurement of the time offset and timing advance of the UE to be located, the dedicated measurement message sent by the RNC to the Node B contains the information unit CFN, which is used to set the Node B to measure the time offset of the UE to be located in a specified radio frame ; The event trigger report is set in the internal measurement message unit of the RRC signaling measurement control message sent by the RNC to the UE to be positioned, that is, the event of the timing advance of the radio frame of the specified SFN is reported, and the information unit about the SFN is included, that is, the RNC Control the UE to be positioned to measure the timing advance of the specified radio frame. In this way, the Node B and the UE to be positioned measure the specified radio frames respectively. The response message of the Node B to the RNC-specific measurement message includes the information unit CFN, and the response message and the measurement report message of the UE to be positioned to the RNC measurement control message include the information unit SFN, which are used to confirm that the reported measurement is for that radio frame Measurements.

Claims (8)

1. a sharp radio network controller (RNC) is determined the localization method of user equipment (UE) to be positioned, comprises step:

A) RNC starts the loop time delay of measuring UE to be positioned;

B) Node B measures the angle of arrival of UE;

C) RNC sets threshold value;

D) when the measured value of the loop time delay of UE to be positioned during less than predefined thresholding, RNC is according to the value locating user devices of the loop time delay and the angle of arrival.

2. by the described method of claim 1, it is characterized in that also comprising step: when the loop time delay measured value of UE to be positioned during greater than predefined threshold value,

RNC starts the propagation loss that UE measures each neighbor cell;

Arrive sub-district number that time difference OTDOA measures more than or equal to 3 the time when RNC judges to can be used for observing, RNC starts UE and measures observation and arrive time difference OTDOA, is used for locating user devices.

3. by the described method of claim 1, it is characterized in that also comprising step: when the loop time delay measured value of UE to be positioned during greater than predefined threshold value,

RNC starts the propagation loss that UE measures each neighbor cell;

When the RNC judgement can be used for observing the sub-district number that arrives time difference OTDOA measurement to equal 2, RNC startup UE measured to observe and arrives time difference OTDOA, and RNC is according to loop time delay, the angle of arrival and available observation arrival time difference OTDOA compute location result.

4. by the described method of claim 1, it is characterized in that also comprising step: when the loop time delay measured value of UE to be positioned during greater than predefined threshold value,

RNC starts the propagation loss that UE measures each neighbor cell;

When the RNC judgement can be used for observing the sub-district number that arrives time difference OTDOA measurement to equal 1, RNC was according to loop time delay and angle of arrival compute location result.

5. by the described method of claim 1, it is characterized in that described measurement loop delay packet draws together:

RNC measures the time deviation that message request Node B measures UE to be positioned by the IuB interface respectively;

RNC is by Uu interface RRC signaling request UE Measuring Time to be positioned lead.

6. by the described method of claim 5, it is characterized in that:

RNC sends in the special measurement message of Node B and comprises Connection Frame Number CFN, and it is used to set Node B and measures the time deviation of UE to be positioned in the radio frames of appointment;

The RRC signaling that RNC sends to UE to be positioned is measured in the internal measurement message elements of control messages Event triggered is set.

7. by the described method of claim 6, it is characterized in that: described Event triggered comprises the information unit of system frame number SFN.

8. by claim 2 or 3 described methods, it is characterized in that described RNC comprises neighbor cell list by the RRC signaling measurement control messages that the Uu interface sends.

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