CN100433908C - Method for reaching time difference positioning - Google Patents
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- CN100433908C CN100433908C CNB2005100680203A CN200510068020A CN100433908C CN 100433908 C CN100433908 C CN 100433908C CN B2005100680203 A CNB2005100680203 A CN B2005100680203A CN 200510068020 A CN200510068020 A CN 200510068020A CN 100433908 C CN100433908 C CN 100433908C
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Abstract
The present invention discloses an arrival time difference positioning method which comprises: after receiving a positioning request message, a service radio network controller (SRNC) obtains positioning capability information of terminal user equipment (UE), the SRNC indicates the UE to measure areas of different base stations according to the positioning capability information and the current channel state of the UE, the UE measures the areas and reports a code offset measured value (T [m]) and a vertical offset measured value (OFF) to the SRNC, and the SRNC carries out positioning calculation according to the measured values and reports positioning result information. The method makes networks not restricted by the UE capability, and the TDOA positioning method is adopted to complete higher positioning accuracy requirements.
Description
Technical field
The present invention relates to wireless communication field, refer to a kind of time of advent of poor (TDOA) localization method especially.
Background technology
One, OTDOA location technology
Two reference points are two base stations in the system, by a series of measurements, obtain the time difference TDOA of the transmission of wireless signals of two reference points of travelling carriage distance, and it is exactly the range difference of travelling carriage apart from these two reference points that this time difference is multiplied by the light velocity.The mathematics implication of this range difference is, the possible track of travelling carriage present position is to be focus with these two reference points, is a fixed poor hyperbola with this range difference; And if other a pair of reference point (reference point can be arranged with top identical) is done identical measurement and calculating, so, at this moment just can obtain an other track hyperbola.Obviously, these two hyp intersection points two-dimensional position coordinate that is exactly travelling carriage.
As shown in Figure 1, when utilizing the coordinate under the different base station to obtain the TDOA measured value with relevant between any two measured value, adopt suitable location-estimation algorithm, for example two couples of NODEB (base station) formation hyperbola intersects, just can calculate the position of mobile station UE: supposition is reference with NODEB a, the pilot phase measurement result that provides according to travelling carriage, it is poor with respect to the down-bound pilot frequency signal time of reception of NODEB a to access NODEB b, be designated as TDOAab, (c*TDOA then, c represents the light velocity) being NODEB, to arrive the propagation distance of travelling carriage poor, can be that benchmark obtains a hyperbola by these two NODEB.Equally, can access NODEB a and NODEB c is another hyperbola of benchmark according to TDOAac, two hyperbola intersection points are the band of position of UE.
When calculating TDOA, mainly to finish by the relevant measurement of OTDOA, it comprises:
1, the minizone observed time difference of being finished by UE (SFN-SFN observed time differenceType2) is measured.The UE measurement adheres to the down-bound pilot frequency signal (CPICH) of the different districts of different N ODEB separately, obtains the phase deviation OTDOA between down-bound pilot frequency signal
UE
2, the SFN-SFN observed time difference that is finished by location measurement unit measures OTDOA
LMUCalculate relative time difference RTD; Perhaps regularly finish OTDOA by UTRAN sub-district frame
LMULocation survey.In addition, it is not enough for the observed time difference of two base stations that travelling carriage is only arranged, and also needs to know two base stations in the time difference of antenna emission port, according to the 3GPP standard, is referred to as relative time difference RTD.The measurement of RTD is measured by location measurement unit LMU and is realized upgrading.
RTD(1，2)＝c*OTDOA
LMU(1，2)-(d2-d1)........................[1]
RTD(1，3)＝c*OTDOA
LMU(1，3)-(d3-d1)........................[2]
TDOA(1，2)＝c*OTDOA
UE(1，2)-RTD(1，2)......................[3]
TDOA(1，3)＝c*OTDOA
UE(1，3)-RTD(1，3)......................[4]
Hyperbolic Equation between 1 and 2 base stations, between 1 and 3 base stations is expressed as follows respectively:
In the aforementioned calculation formula, d1, d2 and d3 represent the distance between the base station 1,2,3 of LMU range measurement respectively; Base station 1,2 and 3 plane rectangular coordinates be respectively (x1, y1), (x2, y2) and (x3, y3), terminal plane rectangular coordinates to be found the solution be (x, y); RTD and TDOA are unified to be the deviation time of advent of unit with the equivalent distances.
Generally speaking, the number of base stations of moving table measuring is many more, and certainty of measurement is high more, and positioning performance improves obvious more, and preferably the NODEB equalizer ring is around UE.
Two, radio frames synchronizing process
(be that SFN-CFN observed time difference measures, comprise a vertical shift measured value OFF and a sign indicating number offset measurement value T by the timing difference measurement of terminal between the sub-district frame number (SFN) of DPCH (DPCH) and Target cell
m), and informing service wireless network controller (SRNC) by the form of measurement report, SRNC just can be according to timing relationship, increases or sets up new Radio Link by vertical shift (Frame Offset) and chip offset (Chip Offset) form.Thus, the radio frames synchronizing process under the fdd mode is used for guaranteeing that terminal obtains correct Frame from several sub-districts.
SFN-CFN observed time difference (SFN-CFN observed time difference) is promptly measured the SFN of Common Pilot Channel (CPICH) of sub-district and the deviation between the current L2 transmission channel CFN, according to 3GPP TS 25.215 agreements, this deviation is defined as: OFF*38400+T
mWherein, T
mBe defined as follows respectively with the OFF value:
T
m＝(T
UETx-T
0)-T
RxSFN.........................[7]
Unit is chip (chip), and span is 0～38399.
OFF＝(SFN-CFN
Tx)MOD?256.......................[8]
Unit is a frame, and span is: 0～255.
Wherein, T
UETx: the moment that expression UE launches up DPCCH (Dedicated Physical Control Channel)/DPDCH (Dedicated Physical Data Channel) frame;
T
0: represent that first DPCH signal refers to peak (DL DPCH
Nom) and T
UETxConstant time deviation value, be a constant, value is 1024 chips;
T
RxSFN: at definite value (T
UETx-T
0) nearest zero hour of the reception of neighboring cell PCCPCH of institute (Primary Common Control Physical Channel) frame before;
CFN
Tx: launch up DPCCH/DPDCH frame T constantly at UE
UETxThe L2 frame number;
SFN: at reception of neighboring cell PCCPCH frame moment T
RxSFNThe SFN frame number that is obtained;
T
m: under dedicated channel (CELL_DCH), initial moment of SFN and UE (T that the Target cell Primary Common Control Physical Channel that UE measures is entrained
UETx-T
0) time difference, its value is 0～38399, unit is chip, promptly in the frame scope with the deviation of SFN;
OFF: under dedicated channel (CELL_DCH), time difference between initial moment of SFN that the Target cell Primary Common Control Physical Channel that UE measures is entrained and the CFN of UE DPCH, its value is 0～255, and unit is a frame, i.e. the deviation of (0～255) and SFN in CFN one-period scope.
The shortcoming of prior art scheme is as follows:
Use the OTDOA localization method, (as disposing the Location Measurement Unit networking and providing SFN-SFN observed time difference to measure or can measure by the timing that UTRAN GPS sub-district frame is regularly finished between each cell SFN) is provided at network under the prerequisite of this localization method, be limited by the ability whether terminal UE can provide OTDOA to measure in a lot of situations: according to 3GPP TS 25.331 agreements, the definition of UE stationkeeping ability (UE positioning capability), indicate by Support for SFN-SFNobserved time difference type 2 measurement cells wherein, do not report this cell to represent not support this measurement type: obtain in for example most typical can be in RRC connection setup complete message (RRCCONNECTION SETUP COMPLETE) or UE capability query response message (UECAPABILITY INFORMATION) the entrained related cells.
Because the ability that does not provide OTDOA to measure in most of terminal of commercial initial stage of WCDMA, and this problem can't all be solved in a short time, therefore, will have compatibility issue in may be in WCDMA networking process long-time always.Because the localization method of TDOA type is than the localization method of TOA (time of advent) type, as: the localization method of cell ID (CELLID)+winding time (RTT) has better positioning accuracy and error robustness, therefore, how realizing that the terminal of different abilities carries out the location of TDOA type, is a present industry practical problem anxious to be solved.
Summary of the invention
The invention provides a kind of time of advent of poor (TDOA) localization method,, can't carry out the problem of TDOA location in order to solve in the prior art under end user device (UE) is not supported situation that OTDOA measures.
The inventive method comprises:
Service wireless network controller SRNC is when learning that UE does not support minizone observed time difference OTDOA to measure, and indication UE carries out the SFN-CFN observed time difference measurements to the sub-district that appointment adheres to different base station separately under dedicated channel;
Receive the sign indicating number offset measurement value T that reports described SRNC after UE measures described sub-district
mWith vertical shift measured value OFF;
Utilize described measured value to position calculating, and report locating result information.
According to said method of the present invention, when UE did not support that minizone observed time difference (OTDOA) measurement and UE present located channel status are dedicated channel status, SRNC indication UE measured the co-frequency cell that appointment adheres to different base station separately.
According to said method of the present invention, when UE does not support that minizone observed time difference (OTDOA) measurement and UE present located channel status are dedicated channel status, if UE supports the alien-frequency district that does not start compact model to measure, SRNC indication UE measures the alien-frequency district that appointment adheres to different base station separately.
According to said method of the present invention, when UE does not support that minizone observed time difference (OTDOA) measurement and UE present located channel status are dedicated channel status, if UE supports the alien-frequency district that does not start compact model to measure, SRNC indication UE measures co-frequency cell and alien-frequency district that appointment adheres to different base station separately.
According to said method of the present invention, also comprise:
SRNC obtains the stationkeeping ability information of UE, and learns that according to described stationkeeping ability information UE does not support OTDOA to measure.
In Radio Resource control (RRC) connection procedure, connect the message acquisition UE stationkeeping ability information of finishing by RRC; Perhaps SRNC obtains UE stationkeeping ability information by the UE capability query.
If UE present located channel status is a common channel state, also comprise the step of UE being moved to dedicated channel status from common channel state.
By starting UE paging, radio bearer foundation or reshuffling flow process UE is moved to dedicated channel status from common channel state.
The described concrete computing formula of utilizing measured value to position calculating is:
TDOA(i，j)＝((OFF(i)+T
m(i))-(OFF(j)+T
m(j))-RTD(i，j))MOD?256
In the formula, and TDOA (i, j) time of advent of expression cell i and sub-district j is poor;
RTD (i, j) relative time of expression cell i and sub-district j is poor;
MOD is a modulo operation.
According to said method of the present invention, also comprise: SRNC is when learning that UE supports that OTDOA measures, then issue location survey control, make UE in the co-frequency cell that adheres to different N ODEB separately of appointment, carry out minizone SFN-SFN difference measurements observing time, finish the timing relationship of UE and measure.
The present invention proposes at UE does not provide under the situation of OTDOA measurement, adopt common frequency measurement control or different-frequency measure control (to need UE to possess the function of two FDD receivers, support not start compact model and can carry out different-frequency measure) carry out that UE SFN-CFN observed time difference (observed time difference) is measured and the measurement of finishing cell synchronization information, SRNC is by the T in the measurement report
mThe RTD that finishes with OFF measured value and Location Measurement Unit (LMU) or NODEB measures, and realizes the calculating of TDOA.The inventive method makes network not be subject to the UE ability and can adopt the localization method of TDOA, finishes the high orientation precision requirement.
Description of drawings
Fig. 1 is an OTDOA method location schematic diagram in the prior art;
Fig. 2 is the inventive method flow chart of steps.
Embodiment
Referring to Fig. 2, be the inventive method flow chart of steps, its concrete implementation step comprises:
Step S11, SRNC receive locating request message, start the location survey flow process;
Step S12, SRNC obtain the stationkeeping ability information of UE by related cells entrained in RRC connection setup complete message or the UE capability query response message;
Step S13, judge according to the UE stationkeeping ability information that obtains whether UE supports OTDOA to measure, and has the OTDOA measurement capability as if UE, execution in step S14 then, otherwise, execution in step S15;
Step S14, the conventional OTDOA of execution measure flow process, issue location survey control, make UE in the co-frequency cell that adheres to different N ODEB separately of appointment, carry out minizone SFN-SFN observed time difference (SFN-SFN observed time difference type 2) and measure, finish the timing relationship of terminal and measure;
Step S15, SRNC judge UE present located channel status, are in common channel state as if UE, then execution in step S16; If UE is in dedicated channel status, then carry out the following step S17, S18 or S19;
Step S16, UE is carried out state transition, UE is moved to dedicated channel status from common channel state, concrete moving method, as: start flow process etc. is set up or reshuffled to UE paging, radio bearer; And select to carry out the following step S17, S18 or S19 according to the ability of UE self;
Step S17, SRNC issue common frequency measurement control to UE; The control of this common frequency measurement does not rely on the ability of UE, under any circumstance can go to step S20 by issuing common frequency measurement control to UE and appointment being adhered to separately the synchronous indication information of co-frequency cell reporting subdistrict of different N ODEB;
Step S18, if UE supports the function of double-receiver under FDD (Frequency Division Duplexing (FDD)) pattern, do not need to start compact model and can carry out the measurement of alien-frequency district, then SRNC can only issue different-frequency measure control to UE, carry out the sub-district synchro measure at the alien-frequency district that adheres to different N ODEB separately, go to step S20;
Step S19, if UE supports the function of double-receiver under FDD (Frequency Division Duplexing (FDD)) pattern, do not need to start compact model and can carry out the measurement of alien-frequency district, then SRNC can issue common frequency measurement control and different-frequency measure control simultaneously to UE, indication UE had both reported the synchronous indication information of co-frequency cell, report the same frequency indication information of alien-frequency district again, continue step S20;
Step S20, UE will carry T
mMeasured value with OFF reports SRNC; Continue the following step;
Step S21, SRNC position calculating according to described measured value, and report locating result information to give high level (core net);
Step S22, finish this time location survey flow process.
Among the step S21, concrete computational methods are as follows:
Definition of T pi is the descending one way propagation time delay (promptly from sub-district CELL i antenna to the UE reception antenna radio signal propagation time) of sub-district CELL i, i=1～N, and N is the maximum neighbor cell number that adheres to different N ODEB separately.Then the difference time of advent of (CELL i and CELL j) can be calculated as follows between the sub-district:
TDOA(i，j)＝T
pi-T
pj....................................[9]
Under dedicated channel, the calculating of neighbor cell TDOA can be as follows:
Relative time difference RTD between network side cell i and the sub-district j (measure processing with the definition of OTDOA and calculate consistent by i, calculating j);
The T that reports according to UE
mWith the OFF measured value:
OFF+T
m＝(SFN
target-DL?DPCH
nom)MOD?256..................[10]
In the formula [10], SFN
TargetExpression UE receives Primary Common Control Physical Channel (PCCPCH) the frame SFN value of cell i to be measured;
DL DPCH
NomRepresent that first downward special physical channel signal refers to the peak;
By [10] formula, it is as follows to obtain cell i transmission SFN relation constantly:
OFF(i)+T
m(i)＝(SFN
target(i)+T
pi-DL?DPCH
nom)MOD?256.............[11]
Wherein, the UE PCCPCH frame SFN value that receives cell i to be measured is SEN
TargetThe time, the emission SFN of the correspondence of CELLi is SFN constantly
Target(i)+T
Pi
Therefore, we can obtain following relation:
T
pi-T
pj＝(((OFF(i)+T
m(i))-(OFF(j)+T
m(j))+(SFN
target(j)-SFN
target(i)))MOD256................................................................[12]
RTD(i，j)＝SFN
target(i)-SFN
target(j)...........................[13]
Thus, can obtain following final result:
TDOA(i，j)＝((OFF(i)+T
m(i))-(OFF(j)+T
m(j))-RTD(i，j))MOD?256...[14]
(i, j), the relative position coordinates of UE can be obtained in substitution formula [5] and [6], realizes the location according to the TDOA that calculates.
(be 2.56s, equivalent distances is about 7.675*10 because the propagation delay between two sub-districts can not surpass 256 frame lengths
8M), (3.0*10 within a frame and all
6M, the overlay area of general sub-district maximum is also with regard to 100～200Km), so modulo operation can not introduced any truncated error in the formula [14].The unit of result of calculation is chip chip.
Because OFF and T
mIn the measurement result, T
mPhysical unit be chip, the physical unit of OFF is a frame, final TDOA result's representation unit will be that chip is a unit.Therefore, effectively the distance expression is about 78m (light velocity/spreading rate, i.e. (3.0*108m/s)/3.84M (chip/s) ≈ 78m).Because what TDOA adopted is other 2 time difference that a bit arrives known accurate location, therefore with simple point-to-point between the time difference (introducing relevant measure error, radio signal propagation time difference etc.) compare, can most ofly cut down when doing subtraction, therefore final relative time difference is also improved preferably.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, differ from localization method a kind of time of advent, comprising:
Service wireless network controller SRNC is when learning that terminal UE does not support minizone observed time difference OTDOA to measure, and indication UE carries out the SFN-CFN observed time difference measurements to the sub-district that appointment adheres to different base station separately under dedicated channel;
Receive the sign indicating number offset measurement value T that reports described SRNC after UE measures described sub-district
mWith vertical shift measured value OFF;
Utilize described measured value to position calculating, and report locating result information.
2, the method for claim 1 is characterized in that, when UE did not support that minizone observed time difference OTDOA measurement and UE present located channel status are dedicated channel status, SRNC indication UE measured the co-frequency cell that appointment adheres to different base station separately.
3, the method for claim 1, it is characterized in that, when UE does not support that minizone observed time difference OTDOA measurement and UE present located channel status are dedicated channel status, if UE supports the alien-frequency district that does not start compact model to measure, SRNC indication UE measures the alien-frequency district that appointment adheres to different base station separately.
4, the method for claim 1, it is characterized in that, when UE does not support that minizone observed time difference OTDOA measurement and UE present located channel status are dedicated channel status, if UE supports the alien-frequency district that does not start compact model to measure, SRNC indication UE measures co-frequency cell and alien-frequency district that appointment adheres to different base station separately.
5, as each described method of claim 1-4, it is characterized in that, also comprise:
SRNC obtains the stationkeeping ability information of UE, and learns that according to described stationkeeping ability information UE does not support OTDOA to measure.
6, method as claimed in claim 5 is characterized in that:
In the radio resource control RRC connection procedure, connect the message acquisition UE stationkeeping ability information of finishing by RRC; Perhaps SRNC obtains UE stationkeeping ability information by the UE capability query.
7, the method for claim 1 is characterized in that, if UE present located channel status is a common channel state, also comprises the step of UE being moved to dedicated channel status from common channel state.
8, method as claimed in claim 7 is characterized in that, by starting UE paging, radio bearer foundation or reshuffling flow process UE is moved to dedicated channel status from common channel state.
9, the method for claim 1 is characterized in that, the described concrete computing formula of utilizing measured value to position calculating is:
TDOA(i，j)＝((OFF(i)+T
m(i))-(OFF(j)+T
m(j))-RTD(i，j))MOD?256
In the formula, and TDOA (i, j) time of advent of expression cell i and sub-district j is poor;
RTD (i, j) relative time of expression cell i and sub-district j is poor;
MOD is a modulo operation.
10, the method for claim 1, it is characterized in that, also comprise: SRNC is when learning that UE supports that OTDOA measures, then issue location survey control, make UE in the co-frequency cell that adheres to different N ODEB separately of appointment, carry out minizone SFN-SFN difference measurements observing time, finish the timing relationship of UE and measure.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008049274A1 (en) * | 2006-10-25 | 2008-05-02 | Huawei Technologies Co., Ltd. | A time difference of arrival based locating method and system |
| US9002354B2 (en) * | 2009-06-12 | 2015-04-07 | Google Technology Holdings, LLC | Interference control, SINR optimization and signaling enhancements to improve the performance of OTDOA measurements |
| CN102256350A (en) * | 2010-05-21 | 2011-11-23 | 鼎桥通信技术有限公司 | Positioning method |
| CN102300310B (en) * | 2010-06-24 | 2014-07-30 | 华为技术有限公司 | Positioning method and device |
| CN102457959B (en) * | 2010-10-27 | 2015-07-15 | 电信科学技术研究院 | Method and device for reporting locating information |
| CN102573059B (en) * | 2012-01-16 | 2014-12-31 | 新邮通信设备有限公司 | Method and system for realizing precise positioning of user equipment (UE) |
| JP5395229B1 (en) * | 2012-07-20 | 2014-01-22 | 株式会社Ｎｔｔドコモ | Mobile communication method |
| CN104053202B (en) * | 2013-03-12 | 2018-10-23 | 南京中兴软件有限责任公司 | Subzone main scramble conflict set recognition, soft handover and list generation method and device |
| CN104780603B (en) * | 2014-01-14 | 2018-11-16 | 上海诺基亚贝尔股份有限公司 | Wireless location method in distributing antenna system |
| CN106658700A (en) * | 2015-10-29 | 2017-05-10 | 中兴通讯股份有限公司 | Wireless positioning apparatus and wireless positioning method |
| CN105491662A (en) * | 2016-01-06 | 2016-04-13 | 上海交通大学 | TDOA-based asynchronous double-frequency interference positioning method |
| CN116489744A (en) * | 2019-11-01 | 2023-07-25 | Oppo广东移动通信有限公司 | Method and device for measuring neighbor cells |
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| EP1448007A1 (en) * | 2003-02-11 | 2004-08-18 | Siemens Aktiengesellschaft | A device and method for forming a set of cells for time difference measurements, measuring time differences and locating a user of a mobile terminal |
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| US6408246B1 (en) * | 2000-10-18 | 2002-06-18 | Xircom Wireless, Inc. | Remote terminal location algorithm |
| CN1554159A (en) * | 2001-07-09 | 2004-12-08 | �����ɷ� | Method and apparatus for time-aligning transmissions from multiple base stations in a CDMA communication system |
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