CN1877356B - Locating method using loop time - Google Patents

Locating method using loop time Download PDF

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Publication number
CN1877356B
CN1877356B CN2006101002809A CN200610100280A CN1877356B CN 1877356 B CN1877356 B CN 1877356B CN 2006101002809 A CN2006101002809 A CN 2006101002809A CN 200610100280 A CN200610100280 A CN 200610100280A CN 1877356 B CN1877356 B CN 1877356B
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rtt
time
winding time
value
quantization unit
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CN1877356A (en
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杨平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention discloses a positioning method by employing round trip time. The method comprises steps of: A. according to round trip time quantizing units set with sections, base station converts the round trip time measure value into round trip time reporting value and reports the reporting value to a wireless network controller; B. the wireless network controller positions terminals according to the measure result reported by the base station. The invention is characterized in that it employs round trip time to position; in the situation of keeping length of bites reported with round trip time (RTT) unchangeable, it can keep the quantizing units of RTT measure value in near distance unchangeable; it supports relative positioning in the range of area which radius is more than 68 kilometers.

Description

A kind of localization method that utilizes the winding time
Technical field
The present invention relates to location technology, relate in particular to a kind of localization method that utilizes the winding time.
Background technology
3rd Generation Partnership Project (3 RdGeneration Partnership Project, 3GPP) three kinds of localization methods have been defined, be that cell ID (Cell ID), observation arrive time difference (ObservedTime Difference Of Arrival, OTDOA) and agps system (Assisted GlobalPositioning Systems, A-GPS).
Wherein, OTDOA and A-GPS propose high requirement to network or mobile phone terminal, and the former has increased network cost, and the latter has increased the terminal cost, and A-GPS also is subjected to terminal (UE) environmental constraints of living in simultaneously.And the localization method of directly getting the Cell ID of center of housing estate position is realized the simplest, but precision also is the poorest, therefore agreement has proposed a kind of enhancement type district sign (Cell ID) localization method simultaneously, be that Cell ID adds winding time (Round Trip Time, RTT) location technology positions terminal, utilize the base station to propagate length two-way time, just can determine the distance between the terminal to base station to the signal between the mobile phone.
3GPP was defined as the winding time: RTT=T RX-T TXWherein, T TX, (reference point is the transmitting antenna mouth for Dedicated Physical Channel, DPCH) the beginning delivery time of frame for the downward special physical channel that sends to terminal; T RXBe the special physical controlling channel of upward/Dedicated Physical Data Channel of self terminal (Dedicated Physical Control Channel/Dedicated PhysicalData Channel accordingly, DPCCH/DPDCH) the beginning time of reception of frame, reference point is the reception antenna mouth.
In theory, RTT is that (Node B) sends downstream signal to terminal from the base station, receives the time interval between the upward signal of self terminal transmission to the base station.Because terminal is receiving downstream signal to sending upward signal to there being transmitting-receiving time difference Rx-Tx the base station from the base station, therefore in the process of base station actual measurement RTT, the measured value of RTT has comprised the transmitting-receiving time difference Rx-Tx of terminal, so in the operation of Practical Calculation radius of a circle, radio network controller (RNC) all can be after must arriving the RTT measured value that the base station reports, deduct the transmitting-receiving time difference Rx-Tx of terminal in the signal transmitting and receiving process, to realize more accurate localization.That is, obtain base station (antenna) particular location and sector sensing situation according to cell ID (Cell ID).Therefore, be that center, terminal to base station distance are that radius is determined a circumference (omnidirectional antenna) or one section circular arc (result is pointed in the sector in conjunction with sector cell) with the base station particular location, realize location to terminal.
In 3GPP 25.214 agreements, owing to the time difference (T that has certain limit constantly that transmits and receives of terminal 0± 148chips), T wherein 0=1024chips, just 876～1172chips.The RTT value of reporting bit wide is that 15 bits, quantization unit are 1/16chips, and the scope of the RTT value of reporting is 0～2 15-1 is 0～32767, has corresponding relation between RTT value of reporting and the RTT measured value, and this corresponding relation is to set up according to the quantization unit of the RTT value of reporting, RTT measured value and terminal minimum transmitting-receiving time difference, is specially:
(RTT R-1)×Step+876≤RTT M＜RTT R×Step+876
Wherein, RTT RBe the value of reporting, RTT MFor measured value, Step are quantization unit, 876 are employed fixed value when the RTT measured value is mapped to the RTT value of reporting, and reality is exactly the minimum value of having got the terminal transmitting-receiving time difference, therefore, claim 876 be that minimum is received and dispatched time difference T MinWhen the quantization unit of RTT measured value was 1/16chips, then the mapping relations between RTT value of reporting and the RTT measured value were:
(RTT R-1)×1/16+876≤RTT M＜RTT R×1/16+876
It is chip (chip) that RTT reports the unit in the mapping table, and the maximum magnitude that the RTT measured value can be represented is 2 15* 1/16+876=2924chips considers the time difference T that constantly exists that transmits and receives of terminal 0± 148chips is when transmitting-receiving time difference Rx-Tx value is maximum transmitting-receiving time difference T MaxDuring=1172chips, according to formula (RTT-(R X-T X))/2 can to converse the largest cell radius that can represent be (2924-1172)/2=876chips, and 1chip is equivalent to 78.125 meters, and it is 876 * 78.125=68 kilometer that correspondence obtains the radius of society distance.
But under wide coverage condition, radius of society may reach kilometers up to a hundred greater than 68 kilometers fully, and at this moment, if quantization unit is 1/16chips, bit wide is that RTT value of reporting of 15 bits can not be supported the relevant positioning function of (greater than 68 kilometers) RTT at a distance.For example, radius of society is at 120 kilometers places, and the RTT measured value during correspondence transmitting-receiving time difference Rx-Tx value 1024 is 120 * 1000/78.125 * 2+1024=4096chips, exceeds the maximum magnitude 2924 that the RTT measured value can be represented, has therefore limited application.
Summary of the invention
The objective of the invention is to, a kind of localization method that utilizes the winding time is provided, under the situation that does not change the byte length that RTT reports, suitable radius of society is the wide covering scene more than 68 kilometers.
The localization method that utilizes the winding time of the present invention can comprise the following steps:
Steps A. according to the winding time quantization unit that segmentation is provided with, the base station is converted to the winding time value of reporting with winding time measurement result, and the described value of reporting is reported radio network controller;
Step B. radio network controller positions terminal according to the measurement result of the winding time that the base station reports.
Wherein, the numerical value of described winding time quantization unit increases along with the increase of distance.
Wherein, described step B specifically comprises the following steps:
Described terminal reports transmitting-receiving time difference Rx-Tx measurement result to radio network controller, and the measurement result of the winding time that radio network controller reports according to Rx-Tx measurement result and base station positions described terminal.
May further include the following step before the described step B:
Described radio network controller can be initiated the measurement of transmitting-receiving time difference Rx-Tx to described terminal.
The quantization unit that the described winding time is set in the described steps A is 0.0625chips in 8.5 kilometer range.
The bit wide of described winding time value of reporting is 15 bits.
In described steps A, described quantization unit can be set according to the cell coverage area of reality.
Wherein, the process that described quantization unit is set in described steps A can comprise the following steps:
Cell coverage area according to reality obtains corresponding winding time maximum;
Arrive in the peaked scope of described winding time zero, can increase the quantization unit that segmentation is provided with described winding time measured value along with the increase of distance.
Described segmentation setting can be the segmentation setting of equidistant or non-equidistance.
The quantization unit of described segmentation can be a kind of or combination in arithmetic progression, the Geometric Sequence.
The invention has the beneficial effects as follows: according to the localization method that utilizes the winding time of the present invention, the quantization unit of RTT measured value is set by segmentation, under the constant situation of the byte length that keeps RTT to report, keep the quantization unit of section RTT measured value closely constant, simultaneously when radius of society is wide covering more than 68 kilometers, can support RTT located in connection function.
Description of drawings
Fig. 1 is the localization method flow chart that utilizes the winding time of the present invention.
Embodiment
Describe the localization method that utilizes the winding time of the present invention in detail below in conjunction with accompanying drawing 1.
In 3GPP 25.133 agreements, the scope that reports that has defined RTT is 0～32767, the RTT value of reporting bit wide is 15 bits, quantization unit is 0.0625chips, and the present invention is keeping the RTT value of reporting bit wide 15 bits constant, and under the constant situation of the quantization unit of the RTT measured value of maintenance short range, increase along with distance, increase the numerical value of quantization unit, the quantization unit of RTT measured value is set, satisfy the application scenarios under wide the covering by segmentation.
As shown in table 1, for the RTT that uses in the Cell ID+RTT position fixing process of the present invention reports mapping table, this RTT reports mapping table to comprise, the RTT value of reporting, three contents of RTT measured value and unit.Wherein, the scope of the RTT value of reporting is 0～32767, and the RTT value of reporting is arranged in first row of table 1 in the mode that increases progressively.Have corresponding relation between the RTT measured value of the RTT value of reporting and the delegation that coexists, this corresponding relation is to set up according to the quantization unit of the RTT value of reporting, RTT measured value and minimum transmitting-receiving time difference, is specially:
(RTT R-1)×Step+876≤RTT M＜RTT R×Step+876
As shown in table 1, keep the bit wide (15 bit) of the RTT value of reporting constant, and the quantization unit (0.0625chips) of the RTT measured value of maintenance short range is constant, increase along with distance, increase the numerical value of the quantization unit of RTT measured value: the value of reporting of the 1st section RTT is 0～8191, and quantization unit is 0.0625chips; The value of reporting of the 2nd section RTT is 8192～16383, and quantization unit is 0.125chips; The value of reporting of the 3rd section RTT is 16384～24575, quantization unit 0.25chips; The value of reporting of the 4th section RTT is 24576～32767, quantization unit 0.5chips.
Through after such processing, the RTT measured value of maximum 32767 correspondences of the RTT value of reporting is 8556, the largest cell radius that can represent reaches 3692chips ((8556-1024-148)/2=3692), corresponding 288 kilometers (3692 * 78.125m=288.4375 kilometer).
The value of reporting Measured value Unit
RT_TIME_0000 Round?trip?time＜876.0000 chip
RT_TIME_0001 876.0000≤Round?trip?time＜876.0625 chip
RT_TIME_0002 876.0625≤Round?trip?time＜876.1250 chip
RT_TIME_0003 876.1250≤Round?trip?time＜876.1875 chip
... ... ...
RT_TIME_8189 1387.7500≤Round?trip?time＜1387.8125 chip
RT_TIME_8190 1387.8125≤Round?trip?time＜1387.8750 chip
The value of reporting Measured value Unit
RT_TIME_8191 1387.8750≤Round?trip?time＜1388.0000 chip
RT_TIME_8192 1388.0000≤Round?trip?time＜1388.1250 chip
RT_TIME_8193 1388.1250≤Round?trip?time＜1388.2500 chip
RT_TIME_8194 1388.2500≤Round?trip?time＜1388.3750 chip
... ... ...
RT_TIME_16381 2411.6250≤Round?trip?time＜2411.7500 chip
RT_TIME_16382 2411.7500≤Round?trip?time＜2411.8750 chip
RT_TIME_16383 2411.8750≤Round?trip?time＜2412.0000 chip
RT_TIME_16384 2412.0000≤Round?trip?time＜2412.2500 chip
RT_TIME_16385 2412.2500≤Round?trip?time＜2412.5000 chip
RT_TIME_16386 2412.5000≤Round?trip?time＜2412.7500 chip
... ... ...
RT_TIME_24573 4460.2500≤Round?trip?time＜4460.5000 chip
RT_TIME_24574 4460.5000≤Round?trip?time＜4460.7500 chip
RT_TIME_24575 4460.7500≤Round?trip?time＜4460.0000 chip
RT_TIME_24576 4460.0000≤Round?trip?time＜4460.5000 chip
RT_TIME_24577 4460.5000≤Round?trip?time＜4470.0000 chip
RT_TIME_24578 4470.0000≤Round?trip?time＜4470.5000 chip
... ... ...
RT_TIME_32764 8554.0000≤Round?trip?time＜8554.5000 chip
RT_TIME_32765 8554.5000≤Round?trip?time＜8555.0000 chip
RT_TIME_32766 8555.0000≤Round?trip?time＜8555.5000 chip
The value of reporting Measured value Unit
RT_TIME_32767 8555.5000≤Round?trip?time chip
Table 1
Particularly, the process that positions is: at first radio network controller (RNC) is initiated the measurement that RTT measured and initiated to terminal (UE) transmitting-receiving time difference Rx-Tx to base station (NodeB); Then, terminal reports the measurement result of Rx-Tx to radio network controller, and the base station also reports the measurement result of RTT to radio network controller simultaneously; At last, the measurement result through type (RTT-(R that reports respectively according to terminal and base station of radio network controller x-T x))/2 calculate the distance between the terminal to base station (antenna).Obtain base station particular location and sector sensing situation according to cell ID (Cell ID), with the particular location of base station is that the distance of center, terminal to base station is that radius is determined a circumference (omnidirectional antenna) or one section circular arc (result is pointed in the sector in conjunction with sector cell), realizes the location to terminal.
Below, consult Fig. 1, describe the localization method that utilizes the winding time of the present invention in detail.
Under the situation of the byte length that does not change existing RTT value of reporting, the localization method that utilizes the winding time of the present invention may further comprise the steps:
Step 1) in advance in base station and radio network controller segmentation the quantization unit of RTT is set, the numerical value of quantization unit increases along with the increase of distance, and in base station and radio network controller, is provided with identical to the segmentation that quantization unit carried out of RTT;
Step 2) radio network controller is initiated the measurement that RTT measured and initiated to terminal transmitting-receiving time difference Rx-Tx to the base station;
The step 3) terminal reports the measurement result of Rx-Tx to radio network controller, the base station also reports the measurement result of RTT to radio network controller simultaneously;
Wherein: in step 3), the base station is converted to the RTT value of reporting with the RTT measured value according to the RTT quantization unit of segmentation setting in the step 1), reports to radio network controller.
The measurement result that terminal that step 4) radio network controller basis is received and base station report positions terminal.
Wherein, mapping obtains the measurement result of RTT to radio network controller according to the RTT quantization unit of segmentation setting in the step 1) in the step 4), and in conjunction with the measurement result through type (RTT-(R of terminal to report x-T x))/2 calculate the distance between the terminal to base station (antenna), thus realize location to terminal.
Wherein, in the step 4), radio network controller is realized the prior art of orientating as to terminal according to the distance between the terminal to base station that calculates, and the present invention is not described in detail.
Below in conjunction with table 1, the localization method application in practice that utilizes the winding time of the present invention is described with a concrete example:
At first, the base station is under the situation that does not change existing RTT bit wide, RTT measured value in current 4460.2500～4460.5000chips scope is mapped as RTT value of reporting 24573 according to the table of himself preserving 1, this RTT value of reporting 24573 is reported radio network controller.This moment, quantization unit was 0.25chips for the base station.
Secondly, radio network controller is received this RTT value of reporting (24573), and the mapping ruler of the RTT value of reporting of preserving and RTT measured value according to himself (that preserves in this mapping ruler and the base station is identical, i.e. table 1), obtaining the RTT value of reporting 24573 pairing RTT measured values is 4460.2500～4460.5000chips.
Once more, the Rx-Tx value that receives according to the RTT measured value that obtains, from terminal of radio network controller and (antenna) position, the determined base station of Cell ID and cell range are finished location to terminal according to the method for prior art.Thereby realized that terminal is apart from the location under the wide covering scene of base station (antenna) 128 kilometers.
In above-mentioned example, the terminal that calculates is relevant with the value size of Rx-Tx apart from the concrete numerical value (128 kilometers) of base station: when Rx-Tx gets T 0+ 148 o'clock, the largest cell radius that RTT can represent was that ((4460.25-1024-148)/2=1644.125) corresponds to 128 kilometer (1644.125 * 78.125=128.447) to 1644.125chips; When Rx-Tx gets T 0-148 o'clock, the largest cell radius that RTT can represent was that ((4460.25-1024+148)/2=1792.125chips corresponds to 140 kilometers (1792.125 * 78.125=140.009 kilometers) to 1792.125chips.
After this processing, the word length that RTT reports is constant, and the quantization unit of the RTT measured value of short range (the 1st section of corresponding RTT, about 8.5 kilometers of radius of society) remains unchanged, and does not influence the positioning accuracy performance.And for the position farther from the base station, use the relevant localization method of RTT, other factors (arc length that causes as fan-shaped subtended angle is very long) become the principal element that influences positioning accuracy already, suitably reduce the RTT quantization unit this moment to almost not influence of positioning accuracy.
More than, the present invention only with equidistant segmentation as preferable segmented mode, and the quantization unit of segmentation is a Geometric Sequence, but, the present invention is not limited thereto, all right Geometric Sequence, modes such as Geometric Sequence and arithmetic progression combination or non-equidistance are carried out segment processing, the different quantization unit of corresponding each section, hour quantization unit is less for general RTT measured value, quantization unit was bigger when the RTT measured value was big, but arbitrarily setting also can realize the present invention, as long as quantization unit is little when satisfying short range, the principle that quantization unit is big during far range gets final product.
The quantization unit of RTT measured value can be set according to the cell coverage area of reality in addition.
Concrete, comprise the following steps:
Obtain the maximum of corresponding RTT measured value according to the cell coverage area of reality;
According to the maximum of this RTT measured value, segmentation is provided with the quantization unit of RTT measured value.Concrete segmentation setting up procedure along with the increase of distance, increases the numerical value of quantization unit as previously mentioned, and segmentation is provided with the quantization unit of RTT measured value, and the present invention is not described in detail.
For example, actual cell coverage area is 180 kilometers, at this moment, the maximum of corresponding RTT measured value be 4608 (180 * 1000/78.125 * 2=4608), be the minimum time difference T of transmitting-receiving according to transmitting-receiving time difference Rx-Tx MinThe span that calculates the RTT measured value is 876～4608+876chips, and segmentation is provided with the quantization unit of RTT measured value to 876～4608+876chips then.
In addition, the localization method that utilizes the winding time of the present invention, being not limited to Cell ID+RTT location technology positions terminal, in observing arrival time difference (OTDOA) location technology, also the time of advent that can use terminal to measure poor (Time Difference Of Arrival, TDOA), be converted into the distance time of advent (ToA) in conjunction with the RTT measured value, thereby terminal is positioned.Wherein, in observing arrival time difference (OTDOA) location technology, as mentioned above, carry out the segmentation setting, can support the positioning function of wide covering scene by quantization unit to the RTT measured value.
In sum, according to the localization method that utilizes the winding time of the present invention, the quantization unit of RTT measured value is set by segmentation, the byte length that guarantees the RTT value of reporting is constant, and the quantization unit of the RTT measured value of maintenance short range is constant, in the covering scene of the existing sub-district of compatibility, realized that suitable radius of society is the wide covering scene more than 68 kilometers.
More than describing is to make things convenient for those of ordinary skills to understand the present invention; to the detailed description that the present invention carried out; but can expect; in the scope that does not break away from claim of the present invention and contained, can also make other variation and modification, these variations and revising all in protection scope of the present invention.

Claims (9)

1. a localization method that utilizes the winding time is characterized in that, comprises the following steps:
Steps A. according to the winding time quantization unit of segmentation setting, the base station is converted to the winding time value of reporting with winding time measurement result, the described value of reporting is reported radio network controller, and the numerical value of described winding time quantization unit increases along with the increase of distance;
Step B. radio network controller positions terminal according to described value of reporting that the base station reports.
2. the localization method that utilizes the winding time as claimed in claim 1 is characterized in that described step B specifically comprises the following steps:
Described terminal reports transmitting-receiving time difference Rx-Tx measurement result, wireless network to radio network controller
Controller positions described terminal according to described value of reporting that Rx-Tx measurement result and base station report.
3. the localization method that utilizes the winding time as claimed in claim 2 is characterized in that, further comprises the following steps: before the described step B
Described radio network controller indicates described terminal to receive and dispatch the measurement of time difference Rx-Tx.
4. the localization method that utilizes the winding time as claimed in claim 1 is characterized in that, the quantization unit that the described winding time is set in the described steps A is 0.0625chips in 8.5 kilometer range.
5. the localization method that utilizes the winding time as claimed in claim 1 is characterized in that, the bit wide of described winding time value of reporting is 15 bits.
6. the localization method that utilizes the winding time as claimed in claim 1 is characterized in that, in described steps A, according to the cell coverage area of reality described quantization unit is set.
7. the localization method that utilizes the winding time as claimed in claim 6 is characterized in that the process that described quantization unit is set comprises the following steps: in described steps A
Cell coverage area according to reality obtains corresponding winding time maximum;
Zero in peaked scope of described winding time, increase segmentation along with the increase of distance described winding time quantization unit is set.
8. as claim 1 or the 6 or 7 described localization methods that utilize the winding time, it is characterized in that described segmentation is set to equidistantly or the segmentation setting of non-equidistance.
9. the localization method that utilizes the winding time as claimed in claim 8 is characterized in that, the quantization unit of described segmentation is a kind of or combination in arithmetic progression, the Geometric Sequence.
CN2006101002809A 2006-07-06 2006-07-06 Locating method using loop time Expired - Fee Related CN1877356B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2012102649A1 (en) * 2011-01-25 2012-08-02 Telefonaktiebolaget L M Ericsson (Publ) Location server method for communicating location information

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CN1536850A (en) * 2003-04-09 2004-10-13 深圳市中兴通讯股份有限公司南京分公 Moving location method based on residential quarter mark and loopback time
CN1764310A (en) * 2004-10-20 2006-04-26 华为技术有限公司 Method for realizing mobile station positioning in WCDMA system

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