CN1852591B - Method for positioning mobile terminal - Google Patents
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- CN1852591B CN1852591B CN2005101183918A CN200510118391A CN1852591B CN 1852591 B CN1852591 B CN 1852591B CN 2005101183918 A CN2005101183918 A CN 2005101183918A CN 200510118391 A CN200510118391 A CN 200510118391A CN 1852591 B CN1852591 B CN 1852591B
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Abstract
When mobile terminal in non-soft switch area, RNC determines current location of mobile terminal based on multiple distance values from mobile terminal to base stations in each neighboring cell as well as ToA distance value between mobile terminal to base station in current cell. The invention raises accuracy for positioning mobile terminal
Description
Technical field
The present invention relates to the location technology in the mobile communication system, particularly a kind of method of localisation of mobile terminals.
Background technology
The research of wireless location technology starts from the automatic vehicle location system of the sixties in 20th century, this technology extensive use in scopes such as public transport, taxi dispatching and safety tracking subsequently.Afterwards, along with the Requirement Increases of people to location-based information service, wireless location technology obtains more researchers' concern, and the appearance of global positioning system (GPS) makes that more wireless location technology has produced qualitative leap, and positioning accuracy is greatly enhanced.
In Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, three kinds of location technologies have been defined, be that cell ID (Cell-ID), observation arrive time difference (OTDOA) and assistant GPS (A-GPS), wherein, OTDOA and A-GPS have proposed high requirement to the portable terminal in WCDMA system or the WCDMA system, the former has increased the network cost of WCDMA system, and the latter has increased the cost of portable terminal, and A-GPS also is subjected to the restriction of portable terminal environment of living in.Cell-ID realizes the simplest, but precision is also the poorest.
Therefore, enhancement mode Cell-ID location technology has been proposed, be that cell ID is in conjunction with (CIRTT) localization method two-way time, the implementation procedure of this localization method is: at first, radio network controller (RNC) sends signal transmitting and receiving time difference (Rx-Tx Time Difference) measurement request to portable terminal, and according to the sign of portable terminal, determine the current affiliated sub-district (one or more) of portable terminal, measure request to the base station transmit signals two-way time of the current affiliated subdistrict of portable terminal (RTT); Secondly, the base station testing of the current affiliated subdistrict of portable terminal and the signal two-way time (RTT) between the portable terminal, receive the Rx-Tx Time Difference that measures the mobile terminal test self of asking; Once more, the base station of the current affiliated subdistrict of portable terminal sends to RNC with the RTT that measures, and portable terminal also sends to RNC with the Rx-Tx Time Difference value that measures simultaneously; At last, RNC obtains the time of advent (ToA) according to formula (RTT-Rx-Tx Time Difference)/2, and then obtains the ToA distance value, determine portable terminal present located position according to formula (RTT-Rx-Tx Time the Difference) * light velocity/2.
Adopt the CIRTT localization method, for the portable terminal that is in non-soft handover area, because RNC can only get access to the base station of the current affiliated sub-district of portable terminal and the RTT between the portable terminal, Rx-Tx Time Difference in conjunction with portable terminal obtains the ToA distance value, therefore the scope of localisation of mobile terminals is an annulus for omni cell, is an arc ring for sector cell.As shown in Figure 1, Fig. 1 is in the schematic diagram of the portable terminal of non-soft handover area for prior art adopts CIRTT localization method location.
Adopt the CIRTT localization method, for the portable terminal that is in soft handover area, because RNC can get access to the base station of the current affiliated a plurality of sub-districts of portable terminal and a plurality of RTT between the portable terminal, Rx-Tx Time Difference in conjunction with portable terminal obtains a plurality of ToA distance values, thereby can obtain a plurality of annulus for omni cell, can obtain a plurality of arc rings for sector cell, by the intersection point between this a plurality of circles (arc) ring, particular location that just can localisation of mobile terminals.As shown in Figure 2, Fig. 2 is in the schematic diagram of the portable terminal of soft handover area for prior art adopts CIRTT localization method location.
Adopt CIRTT localization method localisation of mobile terminals to exist shortcoming, first, for the portable terminal location that is in non-soft handover area, because RNC can only get access to the base station of the current affiliated sub-district of portable terminal and the RTT between the portable terminal, therefore scope that can localisation of mobile terminals can only be a circle (arc) ring, and the position is uncertain and scope is bigger; Second, for the portable terminal location that is in soft handover area, though thereby RNC can get access to the particular location that a plurality of RRT determine portable terminal, but in the WCDMA system, the soft handover of portable terminal only accounts for a less ratio, and it is less that promptly portable terminal is in the probability of soft handover area, and in most of the cases portable terminal is in non-soft handover area, therefore, in most of the cases to the location problem that still location is uncertain and scope is bigger of portable terminal.
Therefore, adopt CIRTT localization method localisation of mobile terminals, generally speaking positioning accuracy is lower.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of localisation of mobile terminals, and this method can improve the positioning accuracy of localisation of mobile terminals when portable terminal is in non-soft handover area.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of method of localisation of mobile terminals, radio network controller (RNC) is preserved the signal propagation model of each sub-district, this method comprises: A, when RNC according to the RTT and calculate two-way time that receives from the base station of the current affiliated subdistrict of portable terminal from the transmitting-receiving time difference Rx-Tx TimeDifference that portable terminal receives, have to time of advent between the base station of portable terminal to a current affiliated subdistrict during ToA distance value, send the nearby region measurement control signal to portable terminal;
B, portable terminal report the downlink path loss value of each adjacent area or from the signal strength signal intensity of each received signal in adjacent area to RNC;
The signal propagation model of each adjacent area that the corresponding RNC of the downlink path loss value of each adjacent area that C, RNC will report preserves obtains portable terminal to a plurality of distance values between the base station of each adjacent area; Perhaps obtain portable terminal behind the downlink path loss value of each adjacent area from the signal strength signal intensity of each received signal in adjacent area and the signal strength signal intensity that the transmits calculating of each adjacent area according to what report, the signal propagation model of each adjacent area that corresponding RNC preserves in advance obtains portable terminal to a plurality of distance values between the base station of each adjacent area;
D, RNC determine the position at the current place of portable terminal to the ToA distance value between the base station of current affiliated subdistrict to a plurality of distance values between the base station of each adjacent area and portable terminal according to portable terminal.
The described Rx-Tx Time of steps A Difference is obtained by mobile terminal test.
Before steps A, this method also comprises:
A1, RNC send Rx-Tx Time difference to portable terminal and measure request, send RTT to the base station of the current affiliated subdistrict of portable terminal and measure request;
A2, the base station that receives the current affiliated subdistrict of portable terminal of the RTT request of measuring are carried out RTT and are measured, and receive portable terminal that Rx-Tx Time difference measures request and carry out Rx-Tx Timedifference and measure;
The base station of A3, the current affiliated subdistrict of portable terminal sends to RNC with the RTT that measures; Portable terminal sends to RNC with the Rx-Tx Time difference that measures;
A4, RNC adopt formula (RTT-Rx-Tx Time the Difference) * light velocity/2 to calculate portable terminal to the ToA distance value between the base station of the current affiliated subdistrict of portable terminal;
A5, RNC judge whether to calculate more than one ToA distance value, if, execution in step A6; Otherwise, execution in step A;
A6, RNC obtain the current affiliated subdistrict of the portable terminal a plurality of annulus or the circular arc of localisation of mobile terminals respectively, with the position of the intersection point between these annulus or the circular arc as the current place of portable terminal according to more than one ToA distance value.
When the downlink path loss value of each adjacent area of the described mobile terminal reporting of step B, the adjacent area is homogeneous-frequency adjacent-domain or alien frequencies adjacent area;
When the signal strength signal intensity of the received signal of the described mobile terminal reporting of step B, the adjacent area is homogeneous-frequency adjacent-domain, alien frequencies adjacent area or different system adjacent area.
The procurement process of the described downlink path loss value of step B is:
Portable terminal receives signal and detects the signal strength signal intensity of received signal from each adjacent area, and obtain the signal strength signal intensity that transmits of each adjacent area by the system message that broadcast each adjacent area, calculate signal strength signal intensity poor of the signal strength signal intensity that transmits of each adjacent area and received signal again, obtain the downlink path loss value of each adjacent area.
The signal strength signal intensity that transmits of described each adjacent area of step C is that RNC stores in advance;
Step C is described to calculate signal strength signal intensity poor that portable terminal is the signal strength signal intensity that transmits of each adjacent area and received signal to the downlink path loss value of each adjacent area.
Step D is described to determine that to the ToA distance value between the base station of current affiliated subdistrict the process of the position at the current place of portable terminal is to a plurality of distance values between the base station of each adjacent area and portable terminal according to portable terminal:
RNC obtains each adjacent area a plurality of annulus or the circular arc of localisation of mobile terminals respectively according to portable terminal to a plurality of distance values between the base station of each adjacent area, obtain the annulus or the circular arc of the current affiliated subdistrict localisation of mobile terminals of portable terminal according to portable terminal to the ToA distance value between the base station of current affiliated subdistrict, with the position of the intersection point between these annulus or the circular arc as the current place of portable terminal.
Step D is described to determine that to the ToA distance value between the base station of current affiliated subdistrict the process of the position at the current place of portable terminal is to a plurality of distance values between the base station of each adjacent area and portable terminal according to portable terminal:
Determine the band of position scope and the piecemeal of portable terminal to the measure error of ToA distance value between the base station of current affiliated subdistrict and 3GPP agreement regulation according to portable terminal, according to a plurality of distance values of portable terminal between the base station of each adjacent area, calculate then the difference of each piecemeal center to the distance between each adjacent area antenna and portable terminal to the distance of the base station of each adjacent area square add up and, obtain at last have minimum add up and the piecemeal center, with the position of this piecemeal center as the current place of portable terminal.
Described each piecemeal center to the procurement process of the distance between each adjacent area antenna is:
RNC preserves the aerial position of each adjacent area in advance, and the aerial position of each adjacent area of preserving in advance according to the position and the RNC at piecemeal center is calculated each piecemeal center to the distance between each adjacent area antenna.
RNC stores the sector auxiliary information of each sub-district, and the band of position scope of described definite portable terminal is also according to the sector auxiliary information of the mobile terminal affiliated sub-district that RNC stored.
Described block division method be equidistant method of partition or etc. the arc length method of partition.From such scheme as can be seen, when portable terminal is in non-soft handover area, RNC of the present invention determines the particular location of terminal to the ToA distance value between the base station of current affiliated subdistrict to a plurality of distance values between the base station of each adjacent area and the portable terminal that adopts prior art to obtain according to portable terminal, rather than as prior art, only determine the particular location of portable terminal to the ToA distance value between the base station of current affiliated subdistrict, thereby improved the positioning accuracy of localisation of mobile terminals according to portable terminal.
Description of drawings
Fig. 1 is in the schematic diagram of the portable terminal of non-soft handover area for prior art adopts CIRTT localization method location.
Fig. 2 is in the schematic diagram of the portable terminal of soft handover area for prior art adopts CIRTT localization method location.
Fig. 3 is method one flow chart of localisation of mobile terminals of the present invention.
Fig. 4 is the method two flow chart of localisation of mobile terminals of the present invention.
Fig. 5 is the band of position and the piecemeal schematic diagram of the definite portable terminal of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
In order to improve the positioning accuracy of localisation of mobile terminals, the present invention adopts following method.
When portable terminal is in soft handover area, the method localisation of mobile terminals that adopts prior art to provide.
The present invention preserves the signal propagation model of each sub-district in advance in RNC, when portable terminal was in non-soft handover area, at first, RNC sent the nearby region measurement control signal to portable terminal; Secondly, the portable terminal that receives the nearby region measurement control signal reports the downlink path loss value of self detected each adjacent area to RNC, and the adjacent area can be homogeneous-frequency adjacent-domain or alien frequencies adjacent area; At last, the signal propagation model of each adjacent area that RNC stores the downlink path loss value correspondence of resulting each adjacent area in advance, obtain a plurality of distance values of portable terminal between the base station of each adjacent area, the portable terminal that RNC obtains to a plurality of distance values between the base station of each adjacent area and employing prior art according to portable terminal is determined the particular location of portable terminal to the ToA distance value between the base station of current affiliated subdistrict.
The signal propagation model of each sub-district of preserving in advance in RNC has defined the signal propagation losses characteristic of institute's respective cell respectively, and the present invention just can determine that according to the downlink path loss value of each adjacent area of the signal propagation model of each adjacent area and mobile terminal reporting the base station of each adjacent area is to the distance value between the portable terminal.
The process that portable terminal detects the downlink path loss value of each adjacent area is: at first, portable terminal receives signal and detects the signal strength signal intensity of received signal from each adjacent area, secondly, obtain the signal strength signal intensity that transmits of each adjacent area in the system message that portable terminal is broadcasted by each adjacent area; At last, portable terminal calculates signal strength signal intensity poor of the signal strength signal intensity that transmits of each adjacent area and received signal, obtains the downlink path loss value of each adjacent area.
When portable terminal does not support to report the function of downlink path loss value of each adjacent area, the present invention can also make portable terminal report from the signal strength signal intensity of each received signal in adjacent area to RNC, and RNC calculates the downlink path loss value that obtains each adjacent area according to the signal strength signal intensity that transmits from the signal strength signal intensity of each received signal in adjacent area and each adjacent area of mobile terminal reporting again.The signal strength signal intensity that transmits of each adjacent area is that RNC stores in advance.
When the adjacent area of portable terminal is different system adjacent area, the present invention also adopts portable terminal to report from the signal strength signal intensity of this received signal in adjacent area to RNC, calculate the downlink path loss value that obtains this adjacent area by RNC according to the signal strength signal intensity of the received signal that is reported and the signal strength signal intensity that transmits of this adjacent area, the signal strength signal intensity that transmits of this adjacent area is that RNC stores in advance.
RNC determines that to the ToA distance value between the base station of current affiliated subdistrict the particular location of portable terminal has two kinds of methods to a plurality of distance values between the base station of each adjacent area and the portable terminal that adopts prior art to obtain according to portable terminal, below these two kinds of methods is described respectively.
First method, RNC obtains each adjacent area a plurality of circles (arc) ring of localisation of mobile terminals respectively according to portable terminal to a plurality of distance values between the base station of each adjacent area, encircle to the circle (arc) that the ToA distance value between the base station of current affiliated subdistrict obtains the current affiliated subdistrict localisation of mobile terminals of portable terminal according to the portable terminal that adopts prior art to obtain, the intersection point between these annulus or the circular arc is exactly the particular location of portable terminal.
Fig. 3 is the flow chart of the method one of localisation of mobile terminals of the present invention, and its concrete steps are:
RNC of the present invention initiates the location dependence test to the portable terminal under the dedicated channel connection status, be in non-dedicated channel connection status if portable terminal is current, then RNC initiates the location dependence test after by modes such as pagings portable terminal being transferred to the dedicated channel connection status again.
The base station of step 302, the current affiliated subdistrict of portable terminal (one or more) sends to RNC with the RTT that measures; Portable terminal sends to RNC with the Rx-Tx Time difference that measures.
Portable terminal of the present invention also can report from the signal strength signal intensity of each received signal in adjacent area to RNC.
Step 309, RNC obtain circle (arc) ring of the current affiliated subdistrict localisation of mobile terminals of portable terminal according to the ToA distance value that step 303 calculates, and will justify the position of (arc) ring as the current place of portable terminal.
The signal propagation model of each adjacent area that step 310, RNC are stored the downlink path loss value correspondence of resulting each adjacent area in advance, obtain portable terminal to a plurality of distance values between the base station of each adjacent area, obtain each adjacent area a plurality of circles (arc) ring of localisation of mobile terminals respectively, and adopt step 309 to obtain circle (arc) ring of the current affiliated subdistrict localisation of mobile terminals of portable terminal, with the position of the intersection point between these circle (arc) rings, finish as the current place of portable terminal.
When mobile terminal reporting be signal strength signal intensity from each received signal in adjacent area the time, RNC is according to poor from the signal strength signal intensity that transmits of the signal strength signal intensity of each received signal in adjacent area and each adjacent area that is reported, after obtaining the downlink path loss value of each adjacent area, execution in step 310 again.
Adopt the described method of Fig. 3, though can when portable terminal is in non-soft handover area, improve the positioning accuracy of localisation of mobile terminals, but because the attenuation characteristic of signal in communication process of each adjacent area of portable terminal is affected by environment very big, and also there is certain fluctuation in signal itself, so the signal propagation model of RNC each sub-district of storing in advance also is difficult to reflect exactly actual conditions each time.If adopt step 310 to determine the position at the current place of portable terminal simply, the algorithm robustness is good inadequately, and the particular location of the portable terminal of being located simultaneously may exist than large deviation.Therefore, the present invention proposes second method.
Second method, consider the range deviation that the propagation of measure error and non-sight line (NLOS) causes, this method is at first determined the band of position scope of portable terminal to the ToA distance value between the base station of current affiliated subdistrict according to portable terminal, this regional extent is carried out piecemeal, and then the aerial position of each sub-district of preserving in advance according to the position and the RNC at piecemeal center is calculated each piecemeal center to the distance between each adjacent area antenna, calculate again the difference of each piecemeal center to the distance between each adjacent area antenna and portable terminal to the distance of the base station of each adjacent area square add up and, obtain at last have minimum add up and the piecemeal center, with the position of this piecemeal center as the current place of portable terminal.
Wherein, portable terminal can adopt the described part steps of Fig. 3 to the distance of each adjacent area.
Fig. 4 is the method two flow chart of localisation of mobile terminals of the present invention, and its concrete steps are:
Step 400～409, employing step 300～309 processes of being narrated.
The ToA distance value that step 410, RNC calculate according to step 303, the sector auxiliary information of preserving in advance, NLOS introducing deviation and measure error obtain the band of position of the current affiliated subdistrict localisation of mobile terminals of portable terminal.
According to the 3GPP agreement, the RTT certainty of measurement is+-0.5chips, quantified precision 1/16chips, quantization error+-1/32chips; Rx-Tx Time Difference Type 1 certainty of measurement+-1.5chips, quantified precision 1chips, quantization error+-0.5chips; Rx-Tx Time Difference Type 2 certainties of measurement+-1chips, quantified precision 1/16chips, quantization error+-1/32chips.NLOS introduces deviation RNLOS and environmental correclation, generally can get 0～200m scope.Can obtain the upper limit and the lower limit of ToA distance value thus:
When using Type 1 to measure:
ToA distance value lower limit 1=ToA distance value+(0.5chips-1/32chips-1.5chips-0.5chips) * light velocity/2=ToA distance value-98m
ToA distance value upper limit 1=ToA distance value+(0.5chips+1/32chips+1.5chips+0.5chips) * light velocity/2+RNLOS=ToA distance value+98m+RNLOS
When using Type 2 to measure:
ToA distance value lower limit 2=ToA distance value+(0.5chips-1/32chips-1chips-1/32chips) * light velocity/2=ToA distance value-59m
ToA distance value upper limit 2=ToA distance value+(0.5chips+1/32chips+1chips+1/32chips) * light velocity/2+RNLOS=ToA distance value+59m+RNLOS
RNC of the present invention just can determine the band of position of portable terminal according to the ToA distance value upper limit and ToA distance value lower limit, if at mobile terminal stores sector auxiliary information is arranged in advance in RNC, then the band of position of portable terminal is determined according to the ToA distance value upper limit, ToA distance value lower limit and sector auxiliary information.Fig. 5 is the band of position and the piecemeal schematic diagram of the definite portable terminal of the present invention.
Step 411, RNC adopt predefined mode piecemeal to the band of position of portable terminal, are divided into the piece into N, the center of each piece be designated as (Xn, Yn, Zn), n=0 ..., N-1.
The mode that sets in advance can for equidistantly or etc. the mode of arc length, and other similar fashion.
Step 412, RNC are calculated each piecemeal center respectively to the distance between each adjacent area antenna according to the aerial position of the piecemeal result of the band of position and each adjacent area of preserving in advance.
The aerial position of each adjacent area is designated as (X ' m, Y ' m, Z ' m), m=0 ..., M-1, hypothesis obtains M nearby region measurement result altogether here.Then obtaining each piecemeal center respectively is Rnm=[(Xn-X ' m to the distance between each adjacent area antenna)
2+ (Yn-Y ' m)
2+ (Zn-Z ' m)
2]
1/2, (n=0 ..., N-1, m=0 ..., M-1).
The signal propagation model of each adjacent area that step 413, RNC are stored the downlink path loss value correspondence of resulting each adjacent area in advance obtains portable terminal to a plurality of distance values between the base station of each adjacent area, is designated as R ' m, m=0 ..., M-1; Calculate each piecemeal center to distance R nm between each adjacent area antenna and R ' m difference square add up and, promptly
(n=0 ..., N-1).
When mobile terminal reporting be signal strength signal intensity from each received signal in adjacent area the time, RNC is according to poor from the signal strength signal intensity that transmits of the signal strength signal intensity of each received signal in adjacent area and each adjacent area that is reported, after obtaining the downlink path loss value of each adjacent area, execution in step 413 again.
Step 414, RNC are according to the Rn that calculates
2, n=0 ..., N-1 gets wherein minimum Rn
2(Xn, Yn is Zn) as the position at the current place of portable terminal in corresponding piecemeal center.
When portable terminal is in non-soft handover area, RNC of the present invention determines the particular location of terminal to the ToA distance value between the base station of current affiliated subdistrict to a plurality of distance values between the base station of each adjacent area and the portable terminal that adopts prior art to obtain according to portable terminal, rather than as prior art, only determine the particular location of terminal to the ToA distance value between the base station of affiliated subdistrict, thereby improved the positioning accuracy of localisation of mobile terminals by portable terminal.
Further, for the positioning accuracy that makes localisation of mobile terminals higher, the present invention adopts the band of position and the piecemeal of determining portable terminal to the ToA distance value between the base station of current affiliated subdistrict and measure error based on portable terminal, portable terminal is calculated to the distance between each adjacent area to a plurality of distance values between the base station of each adjacent area and each piecemeal center, the piecemeal center that is met most, with the position of this piecemeal center, guaranteed the algorithm robustness of localisation of mobile terminals position as the current place of portable terminal.
Method provided by the invention does not increase the network cost and the mobile terminal cost of WCDMA system, just can finish the accurate location of portable terminal.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the method for a localisation of mobile terminals, it is characterized in that, radio network controller (RNC) is preserved the signal propagation model of each sub-district, this method comprises: A, when RNC according to the RTT and calculate two-way time that receives from the base station of the current affiliated subdistrict of portable terminal from the transmitting-receiving time difference Rx-TxTime Difference that portable terminal receives, have to time of advent between the base station of portable terminal to a current affiliated subdistrict during ToA distance value, send the nearby region measurement control signal to portable terminal;
B, portable terminal report the downlink path loss value of each adjacent area or from the signal strength signal intensity of each received signal in adjacent area to RNC;
The signal propagation model of each adjacent area that the corresponding RNC of the downlink path loss value of each adjacent area that C, RNC will report preserves obtains portable terminal to a plurality of distance values between the base station of each adjacent area; Perhaps obtain portable terminal behind the downlink path loss value of each adjacent area from the signal strength signal intensity of each received signal in adjacent area and the signal strength signal intensity that the transmits calculating of each adjacent area according to what report, the signal propagation model of each adjacent area that corresponding RNC preserves in advance obtains portable terminal to a plurality of distance values between the base station of each adjacent area;
D, RNC determine the position at the current place of portable terminal to the ToA distance value between the base station of current affiliated subdistrict to a plurality of distance values between the base station of each adjacent area and portable terminal according to portable terminal.
2. the method for claim 1 is characterized in that, the described Rx-Tx TimeDifference of steps A is obtained by mobile terminal test.
3. the method for claim 1 is characterized in that, before steps A, this method also comprises:
A1, RNC send Rx-Tx Time difference to portable terminal and measure request, send RTT to the base station of the current affiliated subdistrict of portable terminal and measure request;
A2, the base station that receives the current affiliated subdistrict of portable terminal of the RTT request of measuring are carried out RTT and are measured, and receive portable terminal that Rx-Tx Time difference measures request and carry out Rx-Tx Timedifference and measure;
The base station of A3, the current affiliated subdistrict of portable terminal sends to RNC with the RTT that measures; Portable terminal sends to RNC with the Rx-Tx Time difference that measures;
A4, RNC adopt formula (RTT-Rx-Tx Time the Difference) * light velocity/2 to calculate portable terminal to the ToA distance value between the base station of the current affiliated subdistrict of portable terminal;
A5, RNC judge whether to calculate more than one ToA distance value, if, execution in step A6; Otherwise, execution in step A;
A6, RNC obtain the current affiliated subdistrict of the portable terminal a plurality of annulus or the circular arc of localisation of mobile terminals respectively, with the position of the intersection point between these annulus or the circular arc as the current place of portable terminal according to more than one ToA distance value.
4. the method for claim 1 is characterized in that, when the downlink path loss value of each adjacent area of the described mobile terminal reporting of step B, the adjacent area is homogeneous-frequency adjacent-domain or alien frequencies adjacent area;
When the signal strength signal intensity of the received signal of the described mobile terminal reporting of step B, the adjacent area is homogeneous-frequency adjacent-domain, alien frequencies adjacent area or different system adjacent area.
5. the method for claim 1 is characterized in that, the procurement process of the described downlink path loss value of step B is:
Portable terminal receives signal and detects the signal strength signal intensity of received signal from each adjacent area, and obtain the signal strength signal intensity that transmits of each adjacent area by the system message that broadcast each adjacent area, calculate signal strength signal intensity poor of the signal strength signal intensity that transmits of each adjacent area and received signal again, obtain the downlink path loss value of each adjacent area.
6. the method for claim 1 is characterized in that, the signal strength signal intensity that transmits of described each adjacent area of step C is that RNC stores in advance;
Step C is described to calculate signal strength signal intensity poor that portable terminal is the signal strength signal intensity that transmits of each adjacent area and received signal to the downlink path loss value of each adjacent area.
7. the method for claim 1, it is characterized in that step D is described to determine that to the ToA distance value between the base station of current affiliated subdistrict the process of the position at the current place of portable terminal is to a plurality of distance values between the base station of each adjacent area and portable terminal according to portable terminal:
RNC obtains each adjacent area a plurality of annulus or the circular arc of localisation of mobile terminals respectively according to portable terminal to a plurality of distance values between the base station of each adjacent area, obtain the annulus or the circular arc of the current affiliated subdistrict localisation of mobile terminals of portable terminal according to portable terminal to the ToA distance value between the base station of current affiliated subdistrict, with the position of the intersection point between these annulus or the circular arc as the current place of portable terminal.
8. the method for claim 1, it is characterized in that step D is described to determine that to the ToA distance value between the base station of current affiliated subdistrict the process of the position at the current place of portable terminal is to a plurality of distance values between the base station of each adjacent area and portable terminal according to portable terminal:
Determine the band of position scope and the piecemeal of portable terminal to the measure error of ToA distance value between the base station of current affiliated subdistrict and 3GPP agreement regulation according to portable terminal, according to a plurality of distance values of portable terminal between the base station of each adjacent area, calculate then the difference of each piecemeal center to the distance between each adjacent area antenna and portable terminal to the distance of the base station of each adjacent area square add up and, obtain at last have minimum add up and the piecemeal center, with the position of this piecemeal center as the current place of portable terminal.
9. method as claimed in claim 8 is characterized in that, described each piecemeal center to the procurement process of the distance between each adjacent area antenna is:
RNC preserves the aerial position of each adjacent area in advance, and the aerial position of each adjacent area of preserving in advance according to the position and the RNC at piecemeal center is calculated each piecemeal center to the distance between each adjacent area antenna.
10. method as claimed in claim 8 is characterized in that RNC stores the sector auxiliary information of each sub-district, and the band of position scope of described definite portable terminal is also according to the sector auxiliary information of the mobile terminal affiliated sub-district that RNC stored.
11. method as claimed in claim 8 is characterized in that, described block division method be equidistant method of partition or etc. the arc length method of partition.
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| CN2005101183918A CN1852591B (en) | 2005-10-31 | 2005-10-31 | Method for positioning mobile terminal |
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| CN2005101183918A CN1852591B (en) | 2005-10-31 | 2005-10-31 | Method for positioning mobile terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102547836A (en) * | 2010-12-23 | 2012-07-04 | 中国移动通信集团设计院有限公司 | Method, device and system for determining motion trail of mobile terminal |
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