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    • 专利摘要:
    PURPOSE: An apparatus and a method are provided to determine the mutual time difference between signals of base stations even when the signal transmitted from the base station is cut by an object. CONSTITUTION: A method comprises a first step(10) of measuring the mutual time difference between the signals transmitted between one or more base stations; and a second step of determining all possible paths between the base stations, and providing a weight value to the measured time difference with respect to all paths. The signal is transmitted between the base stations through a common pilot channel. The first step includes a sub step of determining an accuracy by using a signal to noise ratio so as to measure errors between the measured time difference and the average time difference. The second step includes a sub step of receiving the mutual time difference data and accuracy data; a sub step(45) of forming sets of all paths between the base stations; a sub step(50) of determining a path vector for each of sets of paths; a sub step(55,60) of forming a weight value for the mutual time difference between signals of the base stations; and a sub step(65) of determining the time difference between signals of the base stations as the weighted sum of the time difference.
    公开号:KR20040043087A
    申请号:KR1020030080884
    申请日:2003-11-15
    公开日:2004-05-22
    发明作者:김형준；원은태；휠린스타니슬라브아나토리비치；갈모노브알렉산더바실리비치；사빈코브앤드류유리비치
    申请人:삼성전자주식회사；
    IPC主号:
    专利说明:

    Apparatus and Method for determining mutual time difference between base station signals in an asynchronous code division multiplexing access (CDMA) systembroadcasting}
    [14] The present invention relates to an apparatus and method for a wireless communication system, and more particularly, to an apparatus and method for determining mutual time difference between base station signals in an asynchronous code division multiple access system.
    [15] Third Generation Code Division Multiple Access (hereinafter referred to as CDMA) Cellular base stations are asynchronous as in the 3 GPP FDD mode. Here, synchronization of base stations means synchronization between downlink transmission signals transmitted from different base stations to the mobile terminal.
    [16] The mobile stations need to determine the time difference between the base station signals in order to save time and hardware resources in the initial base station search process and to locate the mobile station users, or to reduce the amount of stored data during the soft handoff process. A method of determining time difference during the soft handoff process is disclosed in Russian Patent No. 2137314 (Int. Cl 6 H04 L 27/20).
    [17] Also, "Synergies between satellite navigation and location services of terrestrial mobile communication", G. Hein, B. Eissfeller, V. Oehler, Jon O. Winkel, Institute of Geodesy and Navigation, University FAF Munich, ION GPS 2000, 19-22 September 2000, Salt Lake City, UT, has been proposed a method of applying a position measuring unit that receives base station signals and defines mutual time difference.
    [18] However, the prior art disclosed as described above has the following problems.
    [19] First, inaccuracy of base station signals is less accurate due to non-line of sight multipath signal propagation from base stations to location measurement units.
    [20] Second, when direct measurement is impossible, it is impossible to obtain mutual time differences between base station signals.
    [21] As a method for overcoming the above problem, 3GPP TS 25.305 V3.7.0, December 12, 2001 "Stage 2 Functional Specification of UE Positioning inUTRAN" in the Universal Terrestrial Radio Access Network. Is disclosed.
    [22] According to the proposed method, a position measuring unit arranged at a position of a known coordinate receives base station signals and determines their mutual time difference, which will be described with reference to FIG. 1. FIG. 1 is a view for explaining a method of determining mutual time difference between base station signals in a cellular communication system performed by 3GPP TS 25.305 V3.7.0, 2001. 12. FIG.
    [23] Referring to Fig. 1, the base stations 1 and 2, which are to be mutually time-determined, the position measuring unit 3, the base station controller 4, and the mobile user location center 5 are shown.
    [24] The position measuring unit 3 sequentially measures the time difference between the signals received from the base station 1 and the base station 2 by a predetermined number of times. The position measuring unit 3 then obtains an average measurement time difference of the signals of the base stations from the time difference values of the base station signals measured sequentially.
    [25] The position measuring unit 3 uses the signal to noise ratio of the base stations 1 and 2 to determine the accuracy of the average measurement time difference. At this time, the average measurement time difference accuracy is selected with a value linearly related to the error of the average measurement time difference with respect to the measured value of the time difference between the base station signals received by the position measuring unit 3.
    [26] The average measurement time difference and the accuracy of the signals of the base station 1, 2 are transmitted from the position measuring unit 3 to the base station 1, 2 using the existing air interface, and then from each base station through a wired communication line. Is transmitted to the base station controller 4.
    [27] The base station controller 4 considers the relative positions of the base stations 1 and 2 and the position measuring unit 3 which are already known, and uses the average measurement time difference of the base station signals to determine the mutual time difference between the base station signals.
    [28] The mutual time difference and its accuracy determined as described above are transmitted from the base station controller 4 to the mobile user location center 5 via a wired communication line.
    [29] A method of determining mutual time difference between base station signals in an asynchronous code division multiple access communication system according to the related art as described above is as follows.
    [30] In other words, each of the position measuring units receiving signals of two or more base stations and sequentially measuring the mutual time difference between the signals is averaged to determine the averaged measured mutual time difference of the base stations and their accuracy.
    [31] The average measured mutual time difference and its accuracy are transmitted from the position measuring unit to the base station controller through the base station controller, and the base station controller determines the mutual time difference between the signals of each base station pair by the averaged measured mutual time difference of the predetermined base station signals. Will be decided.
    [32] However, the above-described prior art also has the following problems.
    [33] First, the method of determining the mutual time difference between the base station signals by the average measured mutual time difference of the base station signals is still not high in accuracy. This is because noise errors, intersystem interference, and multipath errors affect the estimation of the mutual time difference between base station signals.
    [34] The delay difference of the line of sight base station signals propagation to the position measuring unit can be eliminated using the coordinates of the known base stations and the position measuring unit.
    [35] Represents an estimate of the mutual time difference of the signals of the base station pair (especially the signal from the first base station to the second base station), Is a true value of the mutual time difference between signals of the base station pairs, the difference between the estimated value and the true value is expressed by Equation 1 below.
    [36]
    [37] here, Is an error defined by intersystem interference and noise, Is a multipath error of a first base station, and corresponds to a difference between an actual propagation time of the first base station signal to the position measuring unit and a known propagation time of the first base station signal to the position measuring unit, Is the multipath error of the second base station and corresponds to the difference between the actual propagation time of the second base station signal to the position measuring unit and the known propagation time of the second base station signal to the position measuring unit.
    [38] The average of the estimate of the mutual time difference between the signals of the first and second base stations in the position measuring unit is the noise error value Results in a decrease. Difference value of the multipath error of each base station ( - ) Has a constant value because it is defined by the mutual position of the first and second base stations, the position measuring unit, and the objects (buildings, mountains, hills, etc.) distributed around it.
    [39] Thus, the accuracy of the prior art described above may be insufficient to indicate position.
    [40] Second, although time difference determination between signals is required, it may be impossible to directly measure the difference in time between any base stations, which will be described with reference to FIG. 2.
    [41] Referring to FIG. 2, the base stations 6, 7 and 8, the location measuring units 9 and 10, and the building 11 are shown. Each base station 6, 7, 8 transmits a first and a second signal consisting of the same one group signal each.
    [42] The base station group signals are the same signals transmitted simultaneously from one base station, and include a synchronization channel (SCH), a common pilot channel (CPICH), and a primary common control physical channel (P-CH). CCPCH), and other channels.
    [43] The position measuring units 9 and 10 receive the signals transmitted from the neighbor base stations and measure the time difference between the respective base stations.
    [44] 2, the position measuring unit 9 receives the first signals of the base station 6 and the base station 7 and measures the time difference. The position measuring unit 10 receives the second signals of the base station 7 and the base station 8 and measures the time difference.
    [45] However, the second signal of the base station 6 cannot be blocked by the building 11 and transmitted to the position measuring unit 10. The second signal of the base station 8 is also blocked by the building 11 and cannot be transmitted to the position measuring unit 9.
    [46] The conventional method has no way of determining the mutual time difference between the two base stations 6 and 8 when it is impossible to directly measure the time difference between the signals of the base station 6 and the base station 8 as described above.
    [47] Accordingly, an object of the present invention to solve the above problems is to provide an apparatus and method that can determine the mutual time difference between the base station signals even if the signal transmitted from the base station is blocked by any object.
    [48] It is an object of the present invention to provide an apparatus and method which can improve the accuracy of the mutual time difference determination between base station signals.
    [49] According to an aspect of the present invention, there is provided a method for determining a mutual time difference between base station signals in an asynchronous code division multiple access system, comprising: a first process of measuring a time difference between signals transmitted and received between one or more base stations; All possible paths between base stations are determined, and the measured time difference values are weighted for all the determined paths.
    [50] According to an aspect of the present invention, there is provided an apparatus for determining a mutual time difference between base station signals in an asynchronous code division multiple access system, comprising: a position measuring unit measuring a time difference between signals transmitted and received between one or more base stations; Receiving a time difference of the signal measured from a position measuring unit, determining all possible paths between the base stations, and weighting the measured time difference value for all the determined paths; It is characterized by including.
    [1] 1 is a view for explaining a mutual time difference determination method of the base station signals according to the prior art,
    [2] 2 is a diagram showing the layout of a base station, a location measuring unit, and a building in which the time difference between the base station signals is not directly measured;
    [3] 3 is a diagram showing an example of a wireless communication system showing features of the present invention;
    [4] 4 is a diagram illustrating an embodiment of a position measuring unit for determining an averaged measurement time difference between base station signals;
    [5] 5 is a graph showing a base station as a vertex and the adjusted time difference of the base station signal as a directed side;
    [6] FIG. 6 is a diagram for explaining a path from a first base station to a second base station of a base station pair to determine the mutual time difference;
    [7] 7 is a configuration diagram of a base station according to an embodiment of the present invention;
    [8] 8 is a signal flow diagram for explaining the operation of the base station;
    [9] 9 is a block diagram of a base station controller according to an embodiment of the present invention;
    [10] 10 is a signal flow diagram for explaining the operation of the base station controller;
    [11] 11 is a configuration diagram of a mobile user location center according to an embodiment of the present invention;
    [12] 12 is a signal flowchart for explaining an operation of a mobile user location center;
    [13] 13 is a signal flowchart illustrating a method of determining mutual time difference between base station signals according to the present invention.
    [51] Hereinafter, the detailed operation and structure of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that reference numerals and like elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
    [52] According to the present invention, in acquiring more accurate time difference information between base stations for positioning in an asynchronous mobile communication system in which the base stations are never synchronized, the first base station and the second base station constituting a base station pair may have a large propagation delay. The present invention proposes an apparatus and method using time difference information between various base stations in order to reduce an error in time difference information that may occur when located at.
    [53] First, an example of a method of determining mutual time difference between base station signals proposed by the present invention as described above will be described with reference to FIGS.
    [54] 3 is a diagram showing an example of a wireless communication system showing features of the present invention.
    [55] Referring to FIG. 3, a cellular communication system includes a plurality of base stations 12, 13, 14, 15, and 16 and two or more base station signals from the base stations 12, 13, 14, 15, and 16 via an air interface. And a base station controller 21 for controlling the plurality of base stations 12, 13, 14, 15, and 16 connected to a wired line with the position measuring units 17, 18, 19, and 20 for receiving the A mobile user location center 22 is shown connected with a base station controller 21 by wire. However, a configuration in which the mobile user location center is embedded in the base station controller is also possible.
    [56] The base station 12 transmits a signal consisting of one group signal. The base station 13 transmits first and second signals each consisting of one group signal. The base station 14 transmits first and second signals each consisting of one group signal. The base station 15 transmits first and second signals each consisting of one group signal. The base station 16 transmits first and second signals each consisting of one group signal.
    [57] The base station group signal means a signal transmitted from a base station, and includes a synchronization channel (SCH), a common pilot channel (CPICH), and a primary common control physical channel (P-CCPCH). , And other channels.
    [58] The position measuring unit 17 receives the signal of the base station 12 and the first signal of the base station 13, and continuously measures the time difference between the signal of the base station 13 and the signal of the base station 12. Then, the position measuring unit 17 averages the time differences measured successively so that the average measurement time difference of the first signal of the base station 13 with respect to the signal of the base station 12. Finding that accuracy Determine.
    [59] In addition, the position measuring unit 17 receives the first signal of the base station 13 and the first signal of the base station 14, and continuously measures the time difference between the first signal of the base station 13 with respect to the signal of the base station 14. Measure with The average measured time difference of the first signal of the base station 13 with respect to the signal of the base station 12 is obtained by averaging the continuously measured time differences. Finding that accuracy Determine.
    [60] In addition, the position measuring unit 17 receives the first signal of the base station 12 and the first signal of the base station 14, and continuously measures the time difference between the signal of the base station 12 with respect to the first signal of the base station 14. Measure with The averaged time difference of the signal of the base station 12 with respect to the first signal of the base station 14 is obtained by averaging the continuously measured time differences. Finding that accuracy Determine.
    [61] The position measuring unit 20 receives the first signals of the base station 15 and the base station 16, and continuously measures the time difference of the first signal of the base station 16 with respect to the first signal of the base station 15. The averaged time difference of the first signal of the base station 16 with respect to the first signal of the base station 15 is obtained by averaging the continuously measured time differences. Finding that accuracy Determine.
    [62] The position measuring unit 18 receives the second signals of the base station 13 and the base station 15, and performs continuous measurement of the time difference of the second signal of the base station 15 with respect to the second signal of the base station 13. . Averaging of the continuous measurements of such time differences to average the measured time difference of the second signal of base station 15 relative to the second signal of base station 13 Obtain Then, the accuracy Is determined.
    [63] The position measuring unit 19 receives the second signals of the base station 14 and the base station 16, and performs a continuous measurement of the time difference of the second signal of the base station 14 with respect to the second signal of the base station 16. . The average of successive measurements of such time differences is averaged and measured time difference of the second signal of the base station 14 to the second signal of the base station 16 Obtain Then, the accuracy Is determined.
    [64] For illustrative purposes, the averaged measurement time difference of the second signal of the base station 14 with respect to the second signal of the base station 16 is described below. Finding that accuracy The process of determining is described with reference to FIG.
    [65] Here, it is assumed that the wireless communication system is a 3GPP system in the FDD mode. The base stations of the system transmit a signal including a synchronization channel (SCH), a common pilot channel (CPICH), a primary common control physical channel (P-CCPCH), and the like.
    [66] 4 shows one embodiment of a position measuring unit for determining an averaged measurement time difference between base station signals.
    [67] Referring to FIG. 4, the position measuring unit for determining the averaged time difference between the signals of the third base station 14 and the fifth base station 16 includes an antenna 23, an analog receiver 24, and a group of base stations 14. Signal searcher 25 (hereinafter referred to as searcher 25), decoder 26 of the main common control physical channel of base station 14 (hereinafter referred to as decoder 26) and base station 16 Searcher 27 (hereinafter referred to as searcher 27) of the group signal, decoder 28 (hereinafter referred to herein as 28) of the main common control physical channel of base station 16, and base station 14 and An average measurement time difference determination unit 29 for determining an averaged measurement time difference between signals of the base station 16.
    [68] Here, the input of the antenna 23 is the input of the position measuring unit, the output of the antenna 23 is the input of the analog receiver 24, the output of the receiver 24 is the searcher 25 and the searcher 27 ) As well as the first input of the decoder 26 and decoder 28, the output of the searcher 25 is the first input of the unit 29 and the second input of the decoder 26, The output of the decoder 26 is the second input of the unit 29, the output of the searcher 27 is the third input of the unit 29 and the second input of the decoder 28, the output of the decoder 28. The output becomes the fourth input of the unit 29 and the output of the unit 29 becomes the output of the position measuring unit.
    [69] In that case, the analog receiver may be " System and Method for Generating Signal Waveforms in a CDMA Cellular Telephone System; Int. Cl. 5 H 04 L 27/30, US Pat. No. 5,103,459.
    [70] The searcher 25 and searcher 27 are described in 3GPP TS 25.214 V3.9.0 (2001-12), Physical layer procedures (FDD), Annex C: Cell search procedure and in << cell Searchin W-CDMA >>, Yi-Pin Eric Wang and Tony Ottosson, IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 18, AUGUST 2000.
    [71] Decoder 26 and decoder 28 are Sadayuki ABETA, Mamoru SAWAHASHI, and Fumiyuki ADACHI, Performance Comparison between Time-Miltiplexed Pilot Channel and Parallel Pilot Channel for Coherent Rake Combining in DS-CDMA Mobile Radio, IEICE Trans. Commun., Vol. E81-B, No. It may be implemented similarly to the coherent RAKE receiver of 7, July 1998.
    [72] The input signal of the position measuring unit including the group signals of the base station 14 and the base station 16 is input through the antenna 23 and then applied to the analog receiver 24 as an output of the antenna 23. The output of the analog receiver 24 is input to the searcher 25 and the searcher 27, and also becomes the first input of the decoder 26 and the decoder 28. The searcher 25 searches for the group signal of the base station 14 in a search window having a size of 38400 chips by the synchronization channel and the common pilot channel. The signal from base station 14 is located Assume that is captured at. The searcher 25 also determines the number of primary scrambling codes of the base station 14. Acquisition time position of base station 14 A signal containing the value of is applied from the output of the searcher 25 to the first input of the unit 29 and the second input of the decoder 26. A signal containing the number of main mixing codes of the base station 14 is applied from the output of the searcher 25 to the second input of the decoder 26. The decoder 26 decodes, demodulates, and decodes the main common control physical channel by the obtained value of the acquisition time position of the base station 14 signal and the obtained number of main mixing codes of the base station 14 to thereby decode the first common frame of the system frame. At the instant of chip transmission, the value of the system frame number (SFN) of the base station 14 is obtained. Here, the SFN value of the base station 14 is This is said, Is applied from the output of decoder 26 to the second input of unit 29.
    [73] The searcher 27 searches for the group signal of the base station 16 in a search window having a size of 38400 chips by the synchronization channel and the common pilot channel. The signal from base station 16 is located Assume that is captured at. The searcher 27 also determines the number of main mixing codes of the base station 16. Acquisition time position of base station 16 A signal containing the value of is applied from the output of the searcher 27 to the third input of the unit 29 and the second input of the decoder 28. A signal containing the number of main mixing codes of the base station 16 is applied from the output of the searcher 27 to the second input of the decoder 28. Decoder 28 is the acquisition time position of the base station 16 signal The number of system frames of the base station 16 at the instant of transmission of the first chip of the system frame by decoding, demodulating, and decoding the main common control physical channel by the obtained value of and the obtained number of main mixing codes of the base station 16 ( SFN) is obtained. Such SFN value of base station 14 This is called. Determined value of base station 16 Is applied from the output of decoder 28 to the fourth input of unit 29.
    [74] The unit 29 measures the time difference of the base station 14 signal with respect to the base station 16 signal by Equation 2 below. Determine.
    [75]
    [76] here, Is the length of a frame of a 3 GPP base station signal of 10 ms, Is 1 / (3.84 * Or about 260 one chip long.
    [77] The unit 29 averages some of the measured time differences of the base station 14 signal with respect to the base station 16 signal obtained by Equation 2 above to determine the base station 14 signal with respect to the base station 16 signal. Averaged measurement time difference Get The unit 29 may be embodied in a digital signal processor (DSP) by the algorithm described above.
    [78] If all the position measuring units determine the averaged measured time difference of the base station signal as an equal number of averages in a similar manner, the accuracy of all the average measured time difference of the base station can be determined to be equal to, for example, 100 ms.
    [79] The accuracy of the average measurement time difference of the base station signal is more complicated, and when determining the average measurement time difference of the accurate base station signal or obtaining a different number of average values in different position measuring units, Depending on the signal-to-noise ratio or the number of averages.
    [80] Averaged measurement time difference , , And its accuracy , And Is transmitted from the position measuring unit 17 to the base station 13 and then to the base station controller 21.
    [81] Averaged measurement time difference And its accuracy Is transmitted from the position measuring unit 18 to the base station 13 and then to the base station controller 21.
    [82] Averaged measurement time difference And its accuracy Is transmitted from the position measuring unit 19 to the base station 14 and then to the base station controller 21.
    [83] Averaged measurement time difference And its accuracy Is transmitted from the position measuring unit 20 to the base station 15 and then to the base station controller 21.
    [84] The base station controller 21 has an average measurement time difference received from the position measuring unit 17, as shown in Equation 3 below. The subtracted value of the line signal propagation delay difference from the base station 13 and the base station 12 to the position measuring unit 17 is calculated to calculate the adjusted time difference of the signal of the base station 13 with respect to the signal of the base station 12.
    [85]
    [86] In <Equation 3> Is the signal propagation delay value from the base station 13 to the position measuring unit 17, May be calculated by Equation 4 below as a signal propagation delay value from the base station 12 to the position measuring unit 17.
    [87]
    [88] Where c represents the luminous flux, and , , Is the coordinate of the base station 12, , , Is the coordinate of the base station 13, , , Is the coordinate of the position measuring unit 170. The coordinates of the base station and the position measurement unit may be determined using a global positioning system and / or a global navigation satellite system receiver.
    [89] In that case, the adjusted time difference Accuracy is adjusted and averaged measurement time difference Accuracy of Becomes the same as
    [90] The adjusted time difference of the signal of the base station 13 with respect to the signal of the base station 14 , The adjusted time difference of the signal of the base station 12 with respect to the signal of the base station 14 , The adjusted time difference of the signal of the base station 15 with respect to the signal of the base station 13 , The adjusted time difference of the signal of the base station 14 with respect to the signal of the base station 16 And the adjusted time difference of the signal of the base station 16 with respect to the signal of the base station 15 The same is determined.
    [91] Adjusted time difference , , , , And And its accuracy difference , , , , And its accuracy Is transmitted from the base station controller 21 to the mobile user location center 22.
    [92] The mobile user location center 22 is a mutual time difference between the signals of the base station 13 and the signals of the base station 14. Assume that we have to decide.
    [93] The mutual time difference actual value of the signal of the base station 13 with respect to the signal of the base station 14 is The mutual time difference measured value of the signal of the base station 13 with respect to the signal of the base station 12 The mutual time difference measured value of the signal of the base station 12 with respect to the signal of the base station 14 The mutual time difference measured value of the signal of the base station 15 with respect to the signal of the base station 13 The mutual time difference measured value of the signal of the base station 14 with respect to the signal of the base station 16 The mutual time difference measured value of the signal of the base station 16 with respect to the signal of the base station 15 Is displayed.
    [94] ego Because of, Can be estimated in three ways:
    [95]
    [96] 5 is a configuration and adjusted time difference made up of the base stations 12 to 16. , , , , , And Shows the shape of the graph.
    [97] Referring to Fig. 5, the vertices of the graph are base stations 12 to 16, and the directed arc of the graph is an adjusted time difference. , , , , , And to be.
    [98] The direction of the directed side of the graph is set according to the direction of the adjusted time difference. For example, the directed variation between the base station 13 and the base station 14 is equal to the adjusted time difference of the signal of the base station 13 with respect to the signal of the base station 14, and is directed from the base station 13 to the base station 14, respectively.
    [99] 6 is a mutual time difference 3 estimates of , And Shows three paths in the graph from base station 13 to base station 14.
    [100] The three paths shown in FIG. 6 above are the set of all possible paths from base station 13 to base station 14.
    [101] The vertex of each path is part of the base stations, which is also the graph vertex. The first vertex of each path is base station 13 and the last vertex is base station 14. The second vertex of the first path is the base station 12 and is adjacent to the base station 13 that is the first vertex. The second vertex of the third path is the base station 15 and is adjacent to the base station 13 which is the first vertex. The third vertex of the third path is the base station 16 and is adjacent to the base station 15 which is the second vertex of the third path.
    [102] Adjacent base stations are base stations from which the adjusted time difference of the signal is obtained. For example, base station 15 and base station 16 are contiguous because the adjusted time difference of their signals has been obtained.
    [103] The passing direction of each path is determined from the base station 13 to the base station 14.
    [104] Six adjusted time differences were obtained. Therefore, numbers 1 to 6 are numbered in the adjusted time difference by Equation 5 below.
    [105]
    [106] The term vectors of adjusted time difference and vectors of adjusted time difference accuracy are introduced here.
    [107] Vector of time differences of length 6, the number of adjusted time differences obtained Is represented by Equation 6 below.
    [108]
    [109] Where vector P element of (p takes a value from 1 to 6) is equal to the p-th adjusted time difference among the signals of the base station.
    [110] Vector of adjusted time difference accuracy with length of 6, which is the number of adjusted time differences obtained May be expressed as Equation 7 below.
    [111]
    [112] Where vector P element of (p takes a value from 1 to 6) is equal to the p-th adjusted time difference accuracy of the base station signals.
    [113] For each path, a path vector is formed that lists the adjusted time differences of the base station signals included in that path from the formed set of all possible paths from base station 13 to base station 14. All possible paths are paths between base stations adjacent to a terminal to be measured. The path between adjacent base stations includes an invisible multipath between the base stations.
    [114] The length of each path vector is set to 6, which is the number of adjusted time differences.
    [115] The p-th element of the u-th path vector, where p takes a value from 1 to 6, u takes a value from 1 to 3, and the p-th adjustment for which the path corresponds to the p-th adjusted time difference. If you have the direction of passage of the directed side of the path along the direction of the time difference, it is equal to 1, For the first base station The direction of the p-th adjusted time difference of the first base station is From the first base station If the path is determined as the first base station, and the path has a directed side corresponding to the p-th adjusted time difference, and the passing direction of the directed side of the path is opposite to the direction of the p-th adjusted time difference, it is equal to -1, otherwise it is equal to 0. .
    [116] As a result of the above-described operation, three path vectors corresponding to three paths from the base station 13 to the base station 14 , , And Is obtained, and may be expressed as Equation 8 below.
    [117]
    [118] The distance of the u th path vector (where u takes a value from 1 to 3) is determined by Equation 9 below.
    [119]
    [120] here, Is the p-th element of the u-th path vector, Is the vector of the adjusted time difference accuracy of the base station Is the pth element of.
    [121] Thus, the first path vector The distance of , The second path vector The distance of Is the third path vector The distance of to be.
    [122] For each base station pair, a group of path vectors is selected from the set of all possible path vectors of that base station pair, wherein the selected group of path vectors includes each adjusted time difference obtained. Wherein the number of applications of the obtained adjusted time difference of each selected group of path vectors must not exceed the number of applications of the adjusted time difference of all other groups of path vectors obtained from the set of all possible path vectors, The value of the distance must not exceed the value of the path vector distance of all other path vector groups obtained from the set of all possible path vectors.
    [123] The criteria for selecting such three path vector groups will be described in more detail below.
    [124] The selected path vector group of this example depends on the set of all possible path vectors from base station 13 to base station 14.
    [125] Mutual time difference of the signal of the base station 13 with respect to the signal of the base station 14 Three estimates of the vector of adjusted time differences And three path vectors formed , , And It can be formed using. In that case, the r-th estimate of the mutual time difference (where r takes a value from 1 to 3) is expressed by Equation 10 below.
    [126]
    [127] here, Rth path vector Is the p element of Is the p-th adjusted time difference (mutual time difference vector Pth element of).
    [128] True value of the time difference of the signal of the base station 13 with respect to the signal of the base station 14 Rth mutual time difference for Estimate error Is shown in Equation 11 below.
    [129]
    [130] Accuracy of adjusted time difference of signal of base station And generated three path vectors , , And Estimate of the mutual time difference of separate path vectors using A correlation matrix is formed between the errors of and the magnitude of the correlation matrix is to be. Exponential sign And (here, And Is a value from 1 to 3), and the correlation matrix element is expressed by Equation 12 below.
    [131]
    [132] here, Mutual time difference of Of the first estimate Mutual time difference with of Of the first estimate Correlation coefficient between Is Th path vector Is the p element of Is Th path vector Is the pth element of.
    [133] The correlation matrix element in this example is as shown in Equation 13 below.
    [134]
    [135] In the general case, the correlation matrix is a non-diagonal matrix.
    [136] Obtained correlation matrix Inverse of, matrix Is formed. Correlation matrix formed in this example Matrix that is the inverse of Is shown in Equation 14 below.
    [137]
    [138] Path vector , , And The formed path vector group and the generated correlation matrix Formed matrix that is the inverse of 6 weights of the adjusted time difference are computed using. (Where p takes a value from 1 to 6) is represented by Equation 15 below.
    [139]
    [140] here, Silver index And (here, And Formed takes a value from 1 to 3) Is an element of Is Th path vector Is the p element of Is Th path vector Is the pth element of.
    [141] The weights of the adjusted time difference of this example are as shown in Equation 16 below.
    [142]
    [143] Mutual time difference of the signal of the base station 13 with respect to the signal of the base station 14 Is determined by Equation 17 below.
    [144]
    [145] In other words, it is the adjusted time difference of all the signals of the base station Is determined as the weighted sum of, where the weight of the adjusted time difference of the signal of the base station (Where p takes a value from 1 to 6) is used as the weight. All the paths are weighted according to the measured time difference.
    [146] Now, a general cellular wireless communication system having a base station controller, a base station, a location measuring unit, and a mobile user location center for implementing the present invention as exemplified above will be discussed. In the system each base station is controlled by one base station controller, each position measuring unit receives signals of two or more base stations, and a signal of each base station is received by one or more position measuring units.
    [147] The base station, base station controller, and mobile user location center are described in WO 99/57826 (Method Of Synchronization Of A Base Station Network, May 4, 1998, International Classification Code H 04 J 3 /). 06, H 04 B 7/26).
    [148] A brief description will then be made of a unit comprising the listed components of the cellular wireless communication network.
    [149] Each base station transmits a signal that is its group signal.
    [150] Each position measuring unit sequentially measures the time difference of signals of two or more base stations received by the position measuring unit, and such time difference measurements are averaged to obtain an averaged measurement time difference of signals of the base station. The accuracy of the averaged measurement time difference between the signals of that base station is determined. The averaged measurement time difference and the accuracy of the signals received by each position measuring unit are transmitted from its respective position measuring unit to one of the base stations and then to the base station controller controlling the base station.
    [151] Referring to FIG. 7, the base station 31 includes one or more receivers 34 (hereinafter referred to as receiver 34) that receive signals including the averaged measurement time difference of the signals of the base station pairs and their accuracy, and the signals of the base station pairs. Should be made of a transmitter 35 (hereinafter referred to as transmitter 35) which transmits a signal including the averaged measurement time difference thereof and its accuracy.
    [152] Referring to FIG. 8, the operation of the base station 31 will be described. In step 25, the receiver 34 transmits a signal transmitted from the position measuring unit 30 with the average measurement time difference of the signals of the base station pairs and their accuracy. Receive In step 30 the transmitter 35 transmits a signal to the base station controller 32 including the averaged measurement time difference of the signals of the base station pairs and their accuracy.
    [153] With reference to FIG. 9, the base station controller 32 may include one or more receivers 36, a calculation unit 37, and signals of the base station pairs that receive a signal including the averaged measurement time difference of the signals of the base station pairs and their accuracy. This should be done with the transmitter 38 transmitting the signal including the adjusted time difference and its accuracy.
    [154] The operation of the base station controller 32 will be described with reference to FIG. 11. In step 30, the receiver 36 transmits the signal transmitted by the base station 31 with the average measurement time difference of the signals of the base station pairs and their accuracy. Receive In step 35 the calculation unit 37 averages the known delay difference value in the visible line signal propagation from the first base station and the second base station of each base station pair to the position measurement unit from which the averaged measurement time difference is obtained. The adjusted time difference of the signals of the base station pair is obtained by subtracting the measured time difference. In step 40 the transmitter 38 transmits a signal to the mobile user location center 33 including the adjusted time difference of the signals of the base station pair and its accuracy.
    [155] Referring to FIG. 11, the mobile user location center 33 is one or more receivers 39 (hereinafter referred to as receivers 39) and a calculation unit for receiving signals including the adjusted time difference of the signals of the base station pairs and their accuracy. It consists of 40.
    [156] 12, the operation of the mobile user location center is described with reference to FIG. 12. In step 40, the receiver 39 receives a signal transmitted by the base station controller 32 with the adjusted time difference of the signals of the base station pairs and their accuracy. do.
    [157] In step 45, for each base station pair, form a set of all possible paths from the first base station to the second base station of that base station pair. All possible paths are paths between base stations adjacent to a terminal to be measured, and paths between adjacent base stations include an invisible multipath between the base stations.
    [158] It is assumed that the cellular wireless communication system is also made up of L base stations. All base stations are numbered 1 to L.
    [159] Hereinafter, the term "adjacent base station" will be described. If one or more adjusted time differences of the signal of the base station BSi are obtained with respect to the signal of the base station BSj, the base station BSi is adjacent to the base station BSi (where i and j take values from 1 to L). If p adjusted time differences of the signal of the base station BSi with respect to the signal of the base station BSj are obtained, the base stations are adjacent to each other p times.
    [160] For each base station, a set of neighboring base stations is formed in the following manner.
    [161] The number of base stations adjacent to BSi (Where i takes a value from 1 to L). The set of base stations adjacent to BSi is defined as in Equation 18 below.
    [162]
    [163] Set here Q i th, where q i takes values from 1 to Is the number of q i th base stations adjacent to BS i . If a base station is a base station p times adjacent to BSi, the number is set Included p times. Set of adjacent base stations L is formed.
    [164] For each base station pair, the set of all possible paths from the first base station to the second base station of the pair is formed in the following manner.
    [165] Base station BS BS from BS Let's assume that all paths up to are determined (where, And Takes values from 1 to L). The route determination is a base station BS All base stations adjacent to, BS All base stations, BSs, adjacent to base stations adjacent to All base stations adjacent to the base station of the neighboring base station adjacent to are determined in order.
    [166] Sequential selection is done as follows. A selection sequence that must be determined solely by the sequence of the number of base stations of the formed set of neighboring base stations, followed by the order of each path that must be updated with that number of base stations not previously found in sequential selection. In the general case, the lengths of the resulting paths are different, and the length of each path is less than or equal to the number L of base stations. Each path is a sequence of the number of base stations passed during sequential selection. The first element of the sequence of number of base stations of each path formed is to be. The last element of the sequence of number of base stations in each path formed is It may or may not be. Base station BS Such a formed sequence that ends in persists. That is, the last element of the sequence of number of base stations Such a formed path that is continued. Let U be the number of paths that continue. The paths are the base station BS BS from BS Form a set of all possible routes to. Such paths are numbered from 1 to U.
    [167] For each path of each set formed in step 50, a path vector listing the adjusted time difference included in that path is formed, and the distance of the path vector is determined.
    [168] Assume that we obtain P adjusted time differences of the base station signal. Such adjusted time differences are numbered from 1 to P. Here, the terms adjusted time difference vector and adjusted time accuracy vector are introduced.
    [169] Adjusted time difference vector whose length is P (number of adjusted time differences obtained) Is as shown in Equation 19 below.
    [170]
    [171] Where vector P element of (Where p takes a value from 1 to P) is equal to the p-th adjusted time difference of the base station signal.
    [172] Adjusted time difference accuracy vector of length P (number of adjusted time differences obtained) Is as shown in Equation 20 below.
    [173]
    [174] Where vector P element of (Where p takes a value from 1 to P) is equal to the accuracy of the pth adjusted time difference of the base station signal.
    [175] A path vector is formed for each path of the generated set of all possible paths enumerating the adjusted time differences of the base station signals included in that path.
    [176] For example, base station BS BS from BS Consider this behavior for a set of all possible paths up to.
    [177] The length of each path is set to P, which is the number of adjusted time differences.
    [178] The p-th element of the u-th path vector, where p takes a value from 1 to P, u takes a value from 1 to U, and the p-th direction and the p-th direction whose path corresponds to the p-th adjusted time difference. If the direction of passage of the direction of the path along the direction of the adjusted time difference is equal to 1, the path has a direction of the direction corresponding to the p-th adjusted time difference and the path of the direction of the direction of the path of the path of the p-th adjusted time difference Otherwise, it is equal to -1, otherwise it is equal to 0.
    [179] Base station BS BS from BS U path vectors Is obtained. Base station BS BS from BS The formed vector of all possible paths up to is generally redundant.
    [180] The distance of each path vector formed is determined. For example, base station BS BS from BS Uth vector of the set of all possible path vectors up to The distance of is determined by Equation 21 below.
    [181]
    [182] here, BS BS BS from BS Is the pth element of the uth path vector up to Is a vector of adjusted time difference accuracy Is the pth element of.
    [183] Selecting a group of all possible path vectors of that base station pair for each base station pair in step 55, such that the selected group of path vectors includes each adjusted time difference obtained, wherein each of the selected group of path vectors Do not allow the number of applications of the adjusted temporal difference obtained from the set of all possible path vectors to exceed the number of applications of the adjusted temporal difference of all other groups of path vectors obtained, and the value of the path vector distance from the set of all possible path vectors Do not exceed the value of the path vector distance of all other path vector groups obtained.
    [184] Base station BS BS from BS An example of selecting a group of path vectors from a set of all possible path vectors up to now will be described.
    [185] Base station BS BS from BS The set of all possible path vectors up to is sorted in increasing path vector distance. As a result of such a classification, U path vectors Is obtained, where the path vector Has the minimum distance, the path vector Has the maximum distance.
    [186] Path vector Vector of adjusted time differences Determine as vector The length of P is a vector The p th element of Equation 22 is expressed by Equation 22 below.
    [187]
    [188] Ie path vector It is equal to the absolute value of the pth element of.
    [189] Path vector Time difference vector Determine as follows. vector The length of P is P, and the p th element of the vector , ,… Is 0, otherwise it is 1.
    [190] Base station BS BS from BS To select the set of all possible path vectors up to and including the path vector set in step U-1 Attempts are made to remove them sequentially. In that case, the path vector In the u th step, where u takes a value from 2 to U, in the following manner:
    [191] vector Path vector , ,… , Is formed as a vector of adjusted time differences of For all p, where p takes a value from 1 to P, then the path vector can be removed, otherwise it cannot be removed.
    [192] Base station BS BS from BS It is assumed that there are R path vectors up to. Such path vectors are used later for the base station BS. BS from BS Selected group of path vectors up to To form.
    [193] In step 60, for each base station pair, the weight of the adjusted time difference of the signals of the base station is formed using the obtained accuracy of the adjusted group of the base station's path vectors and the adjusted time difference of the signals of the base station. That is, the weight is given according to the error of the measured time difference for all the paths.
    [194] Base station BS Signal and Base Station BS It will be illustrated to form the weight of the adjusted time difference of the signal.
    [195] Accuracy vector and selected path vector group of adjusted time difference of base station signal Base station BS obtained by a separate path vector using Base station BS for signal The correlation matrix of the error of the mutual time difference of the signals is formed.
    [196] The magnitude of such correlation matrix is [R * R]. Exponent And (here, And Is a value ranging from 1 to R).
    [197]
    [198] Where is the base station BS BS for signal of BS Of the estimate of the mutual time difference of the signals of First error Correlation coefficient between the first error, Is Th path vector Is the p element of Is Th path vector Is the pth element of.
    [199] Formed correlation matrix Matrix that is the inverse of To form.
    [200] Selected group of path vectors of path vectors And generated correlation matrix Formed matrix that is the inverse of To calculate the P weights of the adjusted time difference, the weight of the p th adjusted time difference. (Where p takes a value from 1 to P) is represented by Equation 24 below.
    [201]
    [202] here, Silver index And (here, And Is an element of a formed matrix with values 1 to P), Is Th path vector Is the p element of Is Th path vector Is the pth element of.
    [203] In step 65 the mutual time difference of the signals of each base station pair is determined as the weighted sum of all the adjusted time differences of the signals of the base station, at which time the weight of the adjusted time difference of the signals of the base station is used as the weight.
    [204] For example, base station BS BS for signal of BS Mutual time difference of signals Is determined by Equation 25 below.
    [205]
    [206] In other words, it is the adjusted time difference of all the signals of the base station Is determined as the weighted sum of, where the base station BS And BS Weight of the adjusted time difference of the base station signal formed for (Where p takes a value from 1 to P) is used as the weight.
    [207] Hereinafter, the method of determining mutual time difference on the cellular communication system described above will be described with reference to FIG. 13. 13 shows a position measuring unit 30, a base station 31, a base station controller 32 and a mobile user location center 33.
    [208] In step 10 the position measuring unit 30 sequentially measures the time difference between the received signals of two or more base stations. In step 15 the position measuring unit 30 averages the time difference measurements to find the averaged measurement time difference of the signals of the base station. In step 20 the position measuring unit 30 determines the accuracy of the averaged measurement time difference of the signals of the base station. In step 25 the position measuring unit 30 transmits to the base station 31 a first signal comprising the averaged measurement time difference of the signals of the base station pair and its accuracy. In step 30 the base station 31 transmits a second signal to the base station controller 32 including the averaged measurement time difference of the signals of the base station pair and its accuracy.
    [209] In step 35, the base station controller 32 averages the delay difference value of the base station in the visible line signal propagation from the first base station and the second base station of each base station pair to the position measuring unit which obtained the averaged measurement time difference. The adjusted time difference of the signals of the base station pair is obtained by subtracting the measured time difference.
    [210] In step 40 the base station controller 32 transmits a third signal to the mobile user location center 33 including the adjusted time difference of each base station pair and its accuracy.
    [211] In step 45 the mobile user location center 33 forms a set of all possible paths from the first base station to the second base station of the pair for each base station pair. All possible paths are paths between base stations adjacent to a terminal to be measured, and paths between adjacent base stations include an invisible multipath between the base stations.
    [212] In step 50 the mobile user location center 33 determines a path vector that lists the adjusted time difference of base station signals included in that path for each path of each set created.
    [213] In step 55 the mobile user location center 33 selects for each base station pair a group of path vectors from the set of all possible path vectors of that base station pair, including each adjusted time difference from which the selected group of path vectors is obtained. Wherein the number of applications of the obtained adjusted time difference of each selected group of path vectors does not exceed the number of applications of the adjusted time difference of all other groups of path vectors obtained from the set of all possible path vectors, Ensure that the value of the path vector distance does not exceed the value of the path vector distance of all other path vector groups obtained from the set of all possible path vectors.
    [214] In step 60 the mobile user location center 33 weights the adjusted time difference of the signals of the base station using the obtained accuracy of the selected group of path vectors of the base station and the adjusted time difference of the signals of the base station for each base station pair. Form. In weighting the measured time difference, the weight is weighted according to the error of the time difference measured for all the paths.
    [215] In step 65 the mobile user location center 33 determines the mutual time difference of the signals of each base station pair as the weighted sum of all the adjusted time differences of the signals of the base station, wherein the weighted weight of the adjusted time difference of the signals of the base station is weighted. use.
    [216] As described above, the present invention can not only determine the mutual time difference between the signals of the base station pairs regardless of whether the adjusted time difference of any base station pair can be directly measured, but also determine the mutual time difference between the base station signals. The advantage is that accuracy can be improved.
    权利要求:
    Claims (26)
    [1" claim-type="Currently amended] A method for determining a mutual time difference between base station signals in an asynchronous code division multiple access system,
    A first process of measuring a time difference between signals transmitted and received between one or more base stations;
    And determining all possible paths between the base stations and weighting the measured time difference value for all the determined paths.
    [2" claim-type="Currently amended] The method of claim 1,
    The signal transmitted and received between the one or more base stations is a signal transmitted and received through a common pilot channel.
    [3" claim-type="Currently amended] The method of claim 1, wherein the first process comprises:
    And measuring a time difference of the received signals sequentially and calculating an average of the measured time differences.
    [4" claim-type="Currently amended] The method of claim 3, wherein the first process comprises:
    And determining accuracy using a signal-to-noise ratio to measure an error between the measured time difference and the average measured time difference.
    [5" claim-type="Currently amended] The method of claim 3, wherein the first process comprises:
    And the average measurement time difference value is corrected by subtracting a visible signal propagation delay difference value between the base stations from the average measurement time difference value.
    [6" claim-type="Currently amended] The method of claim 5,
    The visible line propagation delay difference is calculated by Equation 1 below.
    ,

    Where c is the speed of light, , , Is the first base station coordinate, , , Is the second base station coordinate, , , Is the coordinate of the position measuring unit.
    [7" claim-type="Currently amended] The method of claim 1, wherein the second process comprises:
    A first step of receiving the adjusted time difference information and the accuracy information;
    Forming a set of all possible paths between the base stations;
    Determining a path vector enumerating the adjusted time difference and distance of base station signals included in the path for each path of each generated set;
    A fourth step of forming, for each base station, the weight of the adjusted time difference of the signals of the base station using the obtained accuracy of the selected group of path vectors of the base station and the adjusted time difference of the signals of the base station;
    Determining a mutual time difference of signals between each base station as a weighted sum of all adjusted time differences of signals of the base station, wherein a fifth step of using the weighted value of the adjusted time difference of signals of the base station as a weight The method.
    [8" claim-type="Currently amended] The signal difference of the measured signal and the accuracy thereof,
    Said base station controller being transmitted via one of said base stations.
    [9" claim-type="Currently amended] The method of claim 8, wherein the signal difference of the measured signal and the accuracy thereof,
    And from the base station controller to a mobile user location center for calculating the mutual time difference between the base station signals.
    [10" claim-type="Currently amended] The method of claim 7, wherein the third step,
    Such that the selected group of path vectors includes each adjusted time difference obtained, wherein the number of applications of each obtained adjusted time difference of the selected group of path vectors is obtained from the group of all other path vectors obtained from the set of all possible path vectors. Said method being characterized in that it does not exceed the number of applications of the adjusted time difference and that the value of the path vector distance does not exceed the value of the path vector distance of all other path vector groups obtained from the set of all possible path vectors. .
    [11" claim-type="Currently amended] The method of claim 1, wherein all possible routes are:
    The method characterized in that the path between the base stations adjacent to the terminal to be measured.
    [12" claim-type="Currently amended] The method of claim 11, wherein the path between the adjacent base stations,
    And the invisible multipath between the base stations.
    [13" claim-type="Currently amended] The method of claim 1, wherein the second process comprises:
    The weighting method is characterized in that the weight is given according to the error of the measured time difference for all the paths.
    [14" claim-type="Currently amended] An apparatus for determining mutual time difference between base station signals in an asynchronous code division multiple access system,
    A position measuring unit for measuring a time difference between signals transmitted and received between one or more base stations;
    The mobile user location center receives the time difference of the signal measured from the position measuring unit, determines all possible paths between the base stations, and weights the measured time difference value for all the determined paths. The device characterized in that it comprises a.
    [15" claim-type="Currently amended] The method of claim 14, wherein the signal transmitted and received between the one or more base stations,
    The device characterized in that the signal transmitted and received through a common pilot channel.
    [16" claim-type="Currently amended] The method of claim 14, wherein the position measuring unit,
    And sequentially measuring the time differences of the received signals and calculating an average of the measured time differences.
    [17" claim-type="Currently amended] The method of claim 16, wherein the position measuring unit,
    And determining accuracy using a signal-to-noise ratio to measure an error between the measured time difference and the average measured time difference.
    [18" claim-type="Currently amended] The method of claim 16, wherein the position measuring unit,
    And the average measurement time difference value is corrected by subtracting a visible signal propagation delay difference value between the base stations from the average measurement time difference value.
    [19" claim-type="Currently amended] The method of claim 18, wherein the position measuring unit,
    The apparatus as set forth in Equation 27, wherein the visible line signal propagation delay difference is calculated.
    ,

    Where c is the speed of light, , , Is the first base station coordinate, , , Is the second base station coordinate, , , Is the coordinate of the position measuring unit.
    [20" claim-type="Currently amended] 15. The method of claim 14, wherein the mobile user location center is
    Receive the adjusted time difference information and the accuracy information, form a set of all possible paths between the base stations, and for each path of the generated set, the adjusted time difference of base station signals included in the path and its Determine a path vector enumerating the distances, and for each base station form the weight of the adjusted time difference of the signals of the base station using the obtained accuracy of the selected group of path vectors of the base station and the adjusted time difference of the signals of the base station; And determining a mutual time difference of signals between each base station as a weighted sum of all adjusted time differences of signals of the base station, wherein the weight of the adjusted time difference of signals of the base station is used as a weight.
    [21" claim-type="Currently amended] The method of claim 14, wherein the position measuring unit,
    And transmitting the signal difference of the measured signal and the accuracy thereof to a base station controller through one of the base stations.
    [22" claim-type="Currently amended] The method of claim 21, wherein the mobile user location center is:
    And the signal difference of the measured signal and the accuracy thereof are received from the base station controller.
    [23" claim-type="Currently amended] The method of claim 20, wherein the mobile user location center,
    Such that the selected group of path vectors includes each adjusted time difference obtained, wherein the number of applications of each obtained adjusted time difference of the selected group of path vectors is obtained from the group of all other path vectors obtained from the set of all possible path vectors. Said apparatus being characterized in that it does not exceed the number of applications of the adjusted time difference and the value of the path vector distance does not exceed the value of the path vector distance of all other path vector groups obtained from the set of all possible path vectors. .
    [24" claim-type="Currently amended] The method of claim 14, wherein all possible routes are:
    The device characterized in that the path between the base stations adjacent to the terminal to be measured.
    [25" claim-type="Currently amended] 25. The method of claim 24, wherein the path between adjacent base stations is:
    And the invisible multipath between the base stations.
    [26" claim-type="Currently amended] 15. The method of claim 14, wherein the mobile user location center is
    The apparatus as claimed in claim 1, wherein the weighting is performed according to the error of the measured time difference for all the paths.
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    同族专利:
    公开号 | 公开日
    KR100981573B1|2010-09-10|
    US20040151152A1|2004-08-05|
    US7336641B2|2008-02-26|
    RU2248668C2|2005-03-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-11-15|Priority to RU2002130594
    2002-11-15|Priority to RU2002130594/09A
    2003-11-15|Application filed by 삼성전자주식회사
    2004-05-22|Publication of KR20040043087A
    2010-09-10|Application granted
    2010-09-10|Publication of KR100981573B1
    优先权:
    申请号 | 申请日 | 专利标题
    RU2002130594|2002-11-15|
    RU2002130594/09A|RU2248668C2|2002-11-15|2002-11-15|Method for detecting mutual time mismatch of base station signals in cellular radio communication system|
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