CN103369668A - Method and device for using wireless communication system to locate position, and mobile terminal - Google Patents
Method and device for using wireless communication system to locate position, and mobile terminal Download PDFInfo
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Abstract
The invention provides a method and a device for using a wireless communication system to locate a position, and a mobile terminal and relates to the technical field of wireless communication. The method comprises the following steps: a positioning device receives a location request for a mobile terminal; the positioning device acquires transmission intensities of downlink signals transmitted by a plurality of cells to the mobile terminal and reception intensities of the downlink signals at the mobile terminal according to the location request, wherein the plurality of cells include a service cell of the mobile terminal and adjacent cells; the distances between the mobile terminal and corresponding cell base stations are calculated according to the transmission intensities and the reception intensities of the downlink signals of the cells and a predetermined path loss model of wireless signal transmission; and the geographical location of the mobile terminal is determined according to the geographical locations of the cell base stations and the calculated distances between the mobile terminal and the cell base stations. With the method and the device, position locating of the mobile terminal can be simplified, and the implementation cost can be reduced.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to a kind of wireless communication system that utilizes to method, positioner and the portable terminal of terminal position location.
Background technology
Along with developing rapidly of mobile communication, portable terminal is used widely, and is also more and more tightr with contacting of people's daily life.The increasing application wished to know the real-time geographic position of portable terminal, thereby proposed the demand that mobile terminal locations is located.
The localization method of common portable terminal in the prior art is based on satellite-signal and realizes, such as global positioning system (GPS, Global Positioning System) localization method.This localization method need to be installed positioning chip in terminal, and this will increase the hardware cost of terminal.Therefore and this localization method depends on satellite-signal, and (as indoor) its application is restricted in can't the scene of receiving satellite signal.
Summary of the invention
In view of this, the purpose of the embodiment of the invention provides a kind of method, positioner and portable terminal that utilizes wireless communication system to carry out terminal location location, in order to simplifying the location, position of portable terminal, and reduces it and is embodied as this.
For solving the problems of the technologies described above, the embodiment of the invention provides scheme as follows:
A kind of method of utilizing wireless communication system to carry out the location, position comprises:
Positioner receives the Location Request for a portable terminal;
Described positioner is according to described Location Request, obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and the described downstream signal receiving intensity at described portable terminal place, described a plurality of residential quarters comprise Serving cell and the neighbor cell of described portable terminal;
Described positioner calculates the distance between described portable terminal and the respective cell base station according to the path loss model of emissive porwer, receiving intensity and the predetermined transmission of wireless signals of the described downstream signal of each residential quarter;
Described positioner is determined the geographical position that described portable terminal is current according to the geographical position of each cell base station and the distance between the described portable terminal that calculates and each cell base station.
Preferably, in the said method,
Obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and described downstream signal at the receiving intensity at described portable terminal place, comprising:
Described positioner judges whether described portable terminal is in service condition:
When described portable terminal is in service condition, obtain each residential quarter to the emissive porwer of the downstream signal of described portable terminal emission, and, from the measurement report of described mobile terminal reporting, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter;
When described portable terminal is in idle condition, carry out the position renewal by triggering described portable terminal, acquisition is in position updating process, and each residential quarter is to the receiving intensity to the downstream signal of each residential quarter of the emissive porwer of the downstream signal of described portable terminal emission and described mobile terminal reporting.
Preferably, in the said method,
In the distance between the described portable terminal of described calculating and each cell base station, select the receiving intensity greater than default thresholding, and then according to selected receiving intensity, emissive porwer and the described path loss model corresponding with selected receiving intensity, calculate the distance between described portable terminal and the respective cell base station.
Preferably, in the said method,
Distance between the described portable terminal of described calculating and the respective cell base station comprises:
Obtain the N group signal strength data group of a residential quarter, described signal strength data group comprise the residential quarter downstream signal emissive porwer and in the receiving intensity at described portable terminal place, N 〉=2;
According to described path loss model, calculate and respectively organize transmission range corresponding to signal strength data group
N represents n group signal strength data group;
According to formula
Iterative computation obtain between described portable terminal and the respective cell base station apart from d
N, wherein
α is default filter factor.
Preferably, in the said method,
Described definite current geographical position of described portable terminal comprises:
Take the geographical position of cell base station as the distance between the center of circle, described portable terminal and this cell base station as radius, obtain an overlay area of respective cell;
According to the described overlay area of each residential quarter that obtains, determine the overlapping region between the described overlay area, obtain the current geographical position of described portable terminal.
The embodiment of the invention also provides a kind of positioner, comprising:
The request receiving unit is used for receiving the Location Request for a portable terminal;
Signal strength signal intensity obtains the unit, be used for according to described Location Request, obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and the described downstream signal receiving intensity at described portable terminal place, described a plurality of residential quarters comprise Serving cell and the neighbor cell of described portable terminal;
Metrics calculation unit is used for the path loss model according to emissive porwer, receiving intensity and the predetermined transmission of wireless signals of the described downstream signal of each residential quarter, calculates the distance between described portable terminal and the respective cell base station;
Position determination unit is used for according to the geographical position of each cell base station and the distance between the described portable terminal that calculates and each cell base station, determines the geographical position that described portable terminal is current.
Preferably, in the above-mentioned positioner,
Described signal strength signal intensity obtains the unit, and is concrete for judging whether described portable terminal is in service condition:
When described portable terminal is in service condition, obtain each residential quarter to the emissive porwer of the downstream signal of described portable terminal emission, and, from the measurement report of described mobile terminal reporting, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter;
When described portable terminal is in idle condition, carry out the position renewal by triggering described portable terminal, acquisition is in position updating process, and each residential quarter is to the receiving intensity to the downstream signal of each residential quarter of the emissive porwer of the downstream signal of described portable terminal emission and described mobile terminal reporting.
Preferably, in the above-mentioned positioner,
Described metrics calculation unit, in the distance of calculating between described portable terminal and each cell base station, select the receiving intensity greater than default thresholding, and then according to selected receiving intensity, emissive porwer and the described path loss model corresponding with selected receiving intensity, calculate the distance between described portable terminal and the respective cell base station.
Preferably, in the above-mentioned positioner,
Described metrics calculation unit specifically is used for:
Obtain the N group signal strength data group of a residential quarter, described signal strength data group comprise the residential quarter downstream signal emissive porwer and in the receiving intensity at described portable terminal place, N 〉=2;
According to described path loss model, calculate and respectively organize transmission range corresponding to signal strength data group
N represents n group signal strength data group;
According to formula
Iterative computation obtain between described portable terminal and the respective cell base station apart from d
N, wherein
α is default filter factor.
Preferably, in the above-mentioned positioner,
Described position determination unit specifically is used for:
Take the geographical position of cell base station as the distance between the center of circle, described portable terminal and this cell base station as radius, obtain an overlay area of respective cell;
According to the described overlay area of each residential quarter that obtains, determine the overlapping region between the described overlay area, obtain the current geographical position of described portable terminal.
The embodiment of the invention also provides a kind of portable terminal, comprises above-described positioner.
Can find out from the above, the wireless communication system that utilizes that the embodiment of the invention provides carries out method and the positioner of terminal location location, can be based on the downstream signal receiving intensity of cell downlink signal emissive porwer and portable terminal, get the geographical location information of portable terminal, thereby do not need the extra hardware such as GPS chip are installed, thereby can the economize on hardware cost.Simultaneously, the embodiment of the invention is utilized the signal processor system of existing network, report mechanism such as position update mechanism or measurement report, do not need the protocol handler of existing network is manufactured any change, can obtain the position of terminal, therefore its implementation is comparatively succinct, and compatible existing network protocol standard well.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for location, the described position of the embodiment of the invention;
Fig. 2 is for implementing a kind of system configuration schematic diagram of localization method described in the embodiment of the invention;
Fig. 3 is the example schematic of determining terminal location in the embodiment of the invention based on the center of circle and radius;
The structural representation of the device of location, the described position of Fig. 4 embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of portable terminal has been carried out the method that locate the position, can be applied to various cordless communication networks, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks.Herein, term " network " and " system " often use convertibly.Cdma network can be realized the wireless technology such as land wireless access (UTRA), CDMA2000 etc.UTRA comprises other modification of wideband CDMA (WCDMA) and CDMA.CDMA2000 is contained IS-2000, IS-95 and IS-856 standard.The TDMA network can be realized the wireless technology such as global system for mobile communications (GSM).The OFDMA network can be realized such as evolved UTRA (E-UTRA), Ultra-Mobile Broadband (UMB), the wireless technology of IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20 etc.UTRA and E-UTRA are the parts of Universal Mobile Telecommunications System (UMTS).3GPP Long Term Evolution (LTE) and enhancement mode LTE (LTE-A) are the redactions of using the UMTS of E-UTRA.In the document of third generation partner plan (3GPP) tissue, UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM have been described.In third generation partner plans the document of tissue of 2 (3GPP2), CDMA2000 and UMB have been described.Technology described herein can be used for above-mentioned wireless network and radiotechnics and other wireless networks and radiotechnics.
The embodiment of the invention can utilize wireless communication system to realize the location, position of portable terminal, its location, position need to not increase extra positioning chip at portable terminal, and the realization of location, position can't change the data processing protocol flow process between existing terminal and the network, can compatible existing network protocol.
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Please refer to Fig. 1, the described method of utilizing wireless communication system to carry out the terminal location location of the embodiment of the invention comprises step:
Here, described positioner can be a network element that is positioned at network side, and it can be realized by hardware and/or software.According to different cordless communication networks, positioner can be arranged in the different network entities.For example, in gsm system, positioner can be arranged in the mobile switching centre (MSC).
Here, Location Request can be the user of portable terminal, sends to network side by this portable terminal, can also be other users that wish to obtain the positional information of described portable terminal, directly sends to network side.Can carry the identify label of described portable terminal in the described Location Request, this identify label can be can this portable terminal of unique identification sign, such as phone number, international mobile subscriber identity (IMSI), international Mobile Equipment identification code (IMEI), media access control (MAC) address etc., so that network side can be determined the portable terminal of unique correspondence accordingly.
Here, the quantity of described a plurality of residential quarters specifically comprises Serving cell and the neighbor cell of described portable terminal more than or equal to 3.These residential quarters are usually adjacent in the geographical position.When portable terminal was in idle condition, its Serving cell was commonly called persistent district.Because portable terminal will be periodically to the network side reporting measurement reports when being in service condition, includes the information such as signal receiving strength of its Serving cell that measures and adjacent area in this measurement report; And portable terminal is when being in idle condition, usually can be initiatively to the above-mentioned information of terminal to report.Be the picked up signal receiving intensity, present embodiment judges at first whether described portable terminal is in service condition in step 12:
When if described portable terminal is in service condition, then obtain each residential quarter to the emissive porwer of the downstream signal of described portable terminal emission, and, from the measurement report of described mobile terminal reporting, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter;
If described portable terminal is in idle condition, then carry out the position renewal by triggering described portable terminal; Positioner can also obtain each residential quarter of network side in position updating process to the emissive porwer of the downstream signal of described portable terminal emission; Simultaneously, because portable terminal is in position updating process, to report receiving intensity to the downstream signal of each residential quarter to network side, so positioner can according to the reporting of portable terminal, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter.
Here, signal strength signal intensity can characterize with incoming level or launching electrical level.
Here, according to the attenuation degree of downstream signal, utilize path loss model to calculate distance between portable terminal and the cell base station.Path loss model can adopt such as free space model, Bu Lingdun model, EgLi model, Ha Ta (Hata) model, Ha Ta-Ao village (Hata-Okumura) model etc.Because each cell base station has its specific surrounding enviroment usually, preferably, present embodiment can carry out drive test for concrete cell base station, statistics according to drive test, the path loss model that adopts is revised, made it more can meet the actual conditions of this cell base station, and then in step 13, can utilize the path loss model of revised this cell base station, calculate the distance between described portable terminal and this cell base station.
For example, a kind of computing formula of the path loss PL of Hata model (d) is:
PL(d)＝69.55+26.16lg(f)-13.82lg(h
b)-a(h
me)+(44.9-6.55lg(h
b))lg(d)
Wherein, in the above-mentioned formula, the physical significance of parameters is as follows:
D: the distance between the dual-mode antenna, unit K m;
F: centre frequency, the MHz of unit;
h
b: base station antenna height, the m of unit;
h
Me: the mobile portable antennas height;
A (h
Me): the mobile portable antennas height correction is followed, and is the function of coverage areas;
Wherein:
a(h
me)＝(11×lg(f)-0.7)h
me-(1.56×lg(f)-0.8)
According to the regulation of related protocol, terminal can be different to the adjacent area quantity of network side feedback in the different wireless communication system.For example, the adjacent area quantity of terminal feedback may reach 6 in gsm system.Consider complexity and the necessity of calculating, present embodiment can all not carry out above-mentioned distance to all adjacent areas and calculate.
Preferably, present embodiment can be selected received signal quality and calculate the adjacent area preferably, for example, in the distance of calculating between described portable terminal and each cell base station, can select signal strength signal intensity greater than the receiving intensity of default thresholding, and then according to selected receiving intensity, emissive porwer and the described path loss model corresponding with selected receiving intensity, calculate the distance between described portable terminal and the respective cell base station.Concrete, described thresholding can be determined according to the signal strength signal intensity in the concrete wireless communication system.
Perhaps, present embodiment also can be according to the size of cell downlink signal receiving strength, select the receiving intensity of predetermined quantity (more than or equal to 3), for example select 3 receiving intensity values, correspond respectively to three residential quarters, and then based on the selected receiving intensity that goes out, carry out the calculating of described distance.
In step 14, present embodiment can be that the distance between the center of circle, described portable terminal and this cell base station is radius with the geographical position of cell base station, obtains a circle or sector coverage area territory.For example, when the antenna in cell of the described downstream signal of emission is omnidirectional antenna, will obtain a circular coverage area; When antenna in cell is non-omnidirectional antenna, according to this antenna in cell angle of coverage on the figure in the horizontal direction, will obtain a sector coverage area territory.Then, according to the described overlay area of each residential quarter that obtains, determine the overlapping region between the described overlay area, described overlapping region is the current geographical position of described portable terminal, this overlapping region can be the zone with certain area, also may be a point.Here, can also be further with the position coordinates of described overlapping region central point, as the current geographical position of described portable terminal.
The accuracy of calculating for improving distance, present embodiment is in above-mentioned steps 13, for the distance between portable terminal and each cell base station, can repeatedly calculate based on the signal strength data group more than two groups that obtains, the final low-pass filtering mode that adopts is processed a plurality of result of calculations, the final result that obtains after the processing is as the distance between portable terminal and this cell base station.Here, every group of signal strength data group, can be included in the residential quarter that obtains in position updating process downstream signal emissive porwer and at the receiving intensity at described portable terminal place, perhaps be included in the emissive porwer of cell downlink signal in the Preset Time section and the downstream signal receiving intensity of this residential quarter of from terminal survey report, extracting.Here, the Preset Time section is a short period normally, for example in the 50ms, with reduce terminal at this moment between in the section contingent movement on the impact of measurement result.
At this moment, above-mentioned steps 13 specifically can comprise:
A) obtain the N group signal strength data group of a residential quarter, described signal strength data group comprise this residential quarter downstream signal emissive porwer and in the receiving intensity at described portable terminal place, here N 〉=2;
B) according to described path loss model, calculate and respectively organize transmission range corresponding to signal strength data group
N represents n group signal strength data group, thereby obtains N transmission range.
C) according to formula
Iterative computation obtain between described portable terminal and the respective cell base station apart from d
N, wherein
α can be a numerical value between 0～1 for default filter factor usually.
Can find out from the above, the embodiment of the invention is based on the downstream signal receiving intensity of cell downlink signal emissive porwer and portable terminal, utilize the propagation model of wireless signal, obtain the distance of portable terminal and each cell base station, and then obtain the geographical location information of portable terminal according to described distance.Because the embodiment of the invention only needs the wireless signal between network side and the terminal to implement, therefore do not need the extra hardware such as GPS chip are installed, thus can the economize on hardware cost.Simultaneously, the embodiment of the invention is utilized the signal processor system of existing network, report mechanism such as position update mechanism or measurement report, do not need the protocol handler of existing network is manufactured any change, can obtain the position of terminal, therefore its implementation is comparatively succinct, and compatible existing network protocol standard well.
For understanding better the above embodiment of the present invention, below by a gsm system for example, above-described embodiment is done more specifically explanation.For clarity sake, the below describes some aspect of present embodiment for gsm system, and uses the GSM term in the description of major part below.
At first, introduce a positioner (LC, Location Center) network element, provide the whole system block diagram of this example, please refer to MSC shown in Figure 2 and be connected with a plurality of base station controllers (BSC), can connect again a plurality of base station transceivers (BTS) below each BSC.Carry out radio communication by Um Interface between portable terminal and the BTS.In this example, LC specifically can be arranged in MSC, certainly can also be arranged in other network elements.
Before carrying out the location, position, need to obtain the information such as neighboring BS relationship, downstream signal emission, incoming level such as cell ID (CI).If portable terminal is in idle pulley, network side carries out the position by triggering terminal to be upgraded, in position updating process, obtain neighboring BS relationship and emission, incoming level, wherein, incoming level specifically can obtain in the measurement report on the Separate Dedicated Control Channel (SDCCH, Stand-Alone Dedicated Control Channel) from terminal; If being in, portable terminal carries out professional pattern, then network side can be from the recent measurement report that terminal periodic reports, directly know the information such as neighboring BS relationship and emission, incoming level, wherein, incoming level specifically can obtain in the measurement report on the Traffic Channel (TCH, Traffic Channel) from terminal.Usually, in this example, the location, position is always initiated by LC, specifically can may further comprise the steps:
Step a), LC asks according to the user, the launch position position fixing process.
Step b), LC sends position location request to MSC, requires MSC to prepare relevant parameter.
Step c) MSC judges the work at present state of terminal: if terminal is in idle condition, then MSC can require the launch position renewal process, then enters steps d, realizes that terminal is to the incoming level reporting parameters of network side; If terminal is in service condition, then can directly from the measurement report that network side receives, obtain incoming level, then enter steps d.Here, the regulation of related protocol is followed in count off on the adjacent area maximum of portable terminal.
Step c), MSC sends position location request to BSC, requires BSC to prepare parameter; BSC sends position location request to the BTS of correspondence, after knowing the persistent district of terminal, can determine the neighboring BS relationship of this residential quarter, and then obtain the correlation reception level that terminal reports in position updating process, and the relevant parameter that obtains fed back to LC by MSC, then enter steps d.
Steps d), LC is known cell information and emission, incoming level, supposes to obtain to comprise altogether the relevant information of totally three residential quarters of Serving cell, the first adjacent area and the second adjacent area here.At this moment, can according to following formula, calculate the distance between these three residential quarters and the terminal:
PL(d
serv)＝P
t-serv-P
r-serv
PL(d
neib1)＝P
t-neib1-P
r-neib1
PL(d
neib2)＝P
t-neib2-P
r-neib2
Wherein, the path loss model of the predetermined transmission of wireless signals of PL (d) expression, this model can come prior modeling good by the test to actual environment; P
T-serv, P
T-neib1And P
T-neib2The transmitting power that represents respectively Serving cell, the first adjacent area and the second adjacent area downstream signal; P
R-serv, P
R-neib1And P
R-neib2Represent that respectively Serving cell, the first adjacent area and the second adjacent area downstream signal are at the incoming level at portable terminal place; d
Serv, d
Neib1And d
Neib2Represent respectively the distance between portable terminal and Serving cell, the first adjacent area and the second adjacent area.
Step f), as shown in Figure 3, take each cell base station as the center of circle, with correspondence apart from d
Serv, d
Neib1And d
Neib2Be radius, obtain three circles, the overlapping region between these three circles, shade filling part as shown in Figure 3 is the current geographical position of portable terminal.
By above step, this example can be located and the current geographical position of real time tracking mobile terminal.
Please refer to Fig. 4, the embodiment of the invention also provides a kind of positioner, and this device comprises:
The request receiving unit is used for receiving the Location Request for a portable terminal;
Signal strength signal intensity obtains the unit, be used for according to described Location Request, obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and the described downstream signal receiving intensity at described portable terminal place, described a plurality of residential quarters comprise Serving cell and the neighbor cell of described portable terminal;
Metrics calculation unit is used for the path loss model according to emissive porwer, receiving intensity and the predetermined transmission of wireless signals of the described downstream signal of each residential quarter, calculates the distance between described portable terminal and the respective cell base station;
Position determination unit is used for according to the geographical position of each cell base station and the distance between the described portable terminal that calculates and each cell base station, determines the geographical position that described portable terminal is current.
According to the different operating state of terminal, the mode that obtains received signal strength can be distinguished to some extent.At this moment, described signal strength signal intensity obtains the unit, and is concrete for judging whether described portable terminal is in service condition:
When described portable terminal is in service condition, obtain each residential quarter to the emissive porwer of the downstream signal of described portable terminal emission, and, from the measurement report of described mobile terminal reporting, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter;
When described portable terminal is in idle condition, carry out the position renewal by triggering described portable terminal, acquisition is in position updating process, and each residential quarter is to the receiving intensity to the downstream signal of each residential quarter of the emissive porwer of the downstream signal of described portable terminal emission and described mobile terminal reporting.
For reducing amount of calculation, metrics calculation unit described in the present embodiment, in the distance of calculating between described portable terminal and each cell base station, select the receiving intensity greater than default thresholding, and then according to selected receiving intensity, emissive porwer and the described path loss model corresponding with selected receiving intensity, calculate the distance between described portable terminal and the respective cell base station.
For the accuracy of computation of distance is provided, adopt filtering mode to carry out computing in the present embodiment, this moment described metrics calculation unit, specifically be used for:
Obtain the N group signal strength data group of a residential quarter, described signal strength data group comprise the residential quarter downstream signal emissive porwer and in the receiving intensity at described portable terminal place, N 〉=2;
According to described path loss model, calculate and respectively organize transmission range corresponding to signal strength data group
N represents n group signal strength data group;
According to formula
Iterative computation obtain between described portable terminal and the respective cell base station apart from d
N, wherein
α is default filter factor.
The current geographic position of terminal described in the present embodiment can be a point or certain area coverage, i.e. face, concrete, described position determination unit, can be take the geographical position of cell base station as the distance between the center of circle, described portable terminal and this cell base station as radius, obtain an overlay area of respective cell; Then, according to the described overlay area of each residential quarter that obtains, determine the overlapping region between the described overlay area, obtain the current geographical position of described portable terminal.
At last, the embodiment of the invention also provides a kind of portable terminal, and this terminal comprises above-described positioner, can also comprise the various unit that other realizes radio communication, repeats no more herein.
Many functional parts described in this specification all are called as module, in order to emphasize more especially the independence of its implementation.
In the embodiment of the invention, module can realize with software, in order to carried out by various types of processors.For instance, the executable code module of a sign can comprise one or more physics or the logical block of computer instruction, and for instance, it can be built as object, process or function.However, the executable code of institute's identification module need not to be physically located in together, but can comprise the different instruction that is stored on the diverse location, when combining on these command logics, and its composition module and realize the regulation purpose of this module.
In fact, executable code module can be individual instructions or many instructions, and even can be distributed on a plurality of different code segments, be distributed in the middle of the distinct program, and cross over a plurality of memory devices and distribute.Similarly, operating data can be identified in module, and can realize and be organized in the data structure of any suitable type according to any suitable form.Described operating data can be used as the individual data collection and is collected, and perhaps can be distributed on the diverse location (to be included on the different storage device), and can only be present on system or the network as electronic signal at least in part.
When module can utilize software to realize, consider the level of existing hardware technique, so can be with the module of software realization, in the situation of not considering cost, those skilled in the art can build corresponding hardware circuit and realize corresponding function, and described hardware circuit comprises conventional ultra-large integrated (VLSI) circuit or gate array and the existing semiconductor such as logic chip, transistor or other discrete element.Module can also be used programmable hardware device, realizations such as field programmable gate array, programmable logic array, programmable logic device.
The above only is embodiments of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a method of utilizing wireless communication system to carry out the location, position is characterized in that, comprising:
Positioner receives the Location Request for a portable terminal;
Described positioner is according to described Location Request, obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and the described downstream signal receiving intensity at described portable terminal place, described a plurality of residential quarters comprise Serving cell and the neighbor cell of described portable terminal;
Described positioner calculates the distance between described portable terminal and the respective cell base station according to the path loss model of emissive porwer, receiving intensity and the predetermined transmission of wireless signals of the described downstream signal of each residential quarter;
Described positioner is determined the geographical position that described portable terminal is current according to the geographical position of each cell base station and the distance between the described portable terminal that calculates and each cell base station.
2. the method for claim 1 is characterized in that,
Obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and described downstream signal at the receiving intensity at described portable terminal place, comprising:
Described positioner judges whether described portable terminal is in service condition:
When described portable terminal is in service condition, obtain each residential quarter to the emissive porwer of the downstream signal of described portable terminal emission, and, from the measurement report of described mobile terminal reporting, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter;
When described portable terminal is in idle condition, carry out the position renewal by triggering described portable terminal, acquisition is in position updating process, and each residential quarter is to the receiving intensity to the downstream signal of each residential quarter of the emissive porwer of the downstream signal of described portable terminal emission and described mobile terminal reporting.
3. the method for claim 1 is characterized in that,
In the distance between the described portable terminal of described calculating and each cell base station, select the receiving intensity greater than default thresholding, and then according to selected receiving intensity, emissive porwer and the described path loss model corresponding with selected receiving intensity, calculate the distance between described portable terminal and the respective cell base station.
4. such as claim 1 or 3 described methods, it is characterized in that,
Distance between the described portable terminal of described calculating and the respective cell base station comprises:
Obtain the N group signal strength data group of a residential quarter, described signal strength data group comprise the residential quarter downstream signal emissive porwer and in the receiving intensity at described portable terminal place, N 〉=2;
According to described path loss model, calculate and respectively organize transmission range corresponding to signal strength data group
N represents n group signal strength data group;
According to formula
Iterative computation obtain between described portable terminal and the respective cell base station apart from d
N, wherein
α is default filter factor.
5. the method for claim 1 is characterized in that,
Described definite current geographical position of described portable terminal comprises:
Take the geographical position of cell base station as the distance between the center of circle, described portable terminal and this cell base station as radius, obtain an overlay area of respective cell;
According to the described overlay area of each residential quarter that obtains, determine the overlapping region between the described overlay area, obtain the current geographical position of described portable terminal.
6. a positioner is characterized in that, comprising:
The request receiving unit is used for receiving the Location Request for a portable terminal;
Signal strength signal intensity obtains the unit, be used for according to described Location Request, obtain a plurality of residential quarters to the emissive porwer of the downstream signal of described portable terminal emission and the described downstream signal receiving intensity at described portable terminal place, described a plurality of residential quarters comprise Serving cell and the neighbor cell of described portable terminal;
Metrics calculation unit is used for the path loss model according to emissive porwer, receiving intensity and the predetermined transmission of wireless signals of the described downstream signal of each residential quarter, calculates the distance between described portable terminal and the respective cell base station;
Position determination unit is used for according to the geographical position of each cell base station and the distance between the described portable terminal that calculates and each cell base station, determines the geographical position that described portable terminal is current.
7. positioner as claimed in claim 6 is characterized in that,
Described signal strength signal intensity obtains the unit, and is concrete for judging whether described portable terminal is in service condition:
When described portable terminal is in service condition, obtain each residential quarter to the emissive porwer of the downstream signal of described portable terminal emission, and, from the measurement report of described mobile terminal reporting, obtain described portable terminal to the receiving intensity of the downstream signal of each residential quarter;
When described portable terminal is in idle condition, carry out the position renewal by triggering described portable terminal, acquisition is in position updating process, and each residential quarter is to the receiving intensity to the downstream signal of each residential quarter of the emissive porwer of the downstream signal of described portable terminal emission and described mobile terminal reporting.
8. positioner as claimed in claim 6 is characterized in that,
Described metrics calculation unit, in the distance of calculating between described portable terminal and each cell base station, select the receiving intensity greater than default thresholding, and then according to selected receiving intensity, emissive porwer and the described path loss model corresponding with selected receiving intensity, calculate the distance between described portable terminal and the respective cell base station.
9. such as claim 6 or 8 described positioners, it is characterized in that,
Described metrics calculation unit specifically is used for:
Obtain the N group signal strength data group of a residential quarter, described signal strength data group comprise the residential quarter downstream signal emissive porwer and in the receiving intensity at described portable terminal place, N 〉=2;
According to described path loss model, calculate and respectively organize transmission range corresponding to signal strength data group
N represents n group signal strength data group;
According to formula
Iterative computation obtain between described portable terminal and the respective cell base station apart from d
N, wherein
α is default filter factor.
10. positioner as claimed in claim 6 is characterized in that,
Described position determination unit specifically is used for:
Take the geographical position of cell base station as the distance between the center of circle, described portable terminal and this cell base station as radius, obtain an overlay area of respective cell;
According to the described overlay area of each residential quarter that obtains, determine the overlapping region between the described overlay area, obtain the current geographical position of described portable terminal.
11. a portable terminal is characterized in that, comprises such as each described positioner of claim 6 to 10.
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