CN101965051A - Positioning method and positioning server - Google Patents
Positioning method and positioning server Download PDFInfo
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- CN101965051A CN101965051A CN2010102944404A CN201010294440A CN101965051A CN 101965051 A CN101965051 A CN 101965051A CN 2010102944404 A CN2010102944404 A CN 2010102944404A CN 201010294440 A CN201010294440 A CN 201010294440A CN 101965051 A CN101965051 A CN 101965051A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/14—Determining absolute distances from a plurality of spaced points of known location
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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Abstract
The invention discloses a positioning method, which comprises a step of calculating position estimation of a terminal by using single base station positioning technology when the distance between at least one neighboring area base station and a service base station is smaller than or equal to a preset base station distance threshold, or when the distances between all neighboring area base stations and the service base station are greater than the preset base station distance threshold and the distance between the terminal and the service base station is close distance. The invention also provides a positioning server. According to the technical scheme of the invention, positioning estimation of the terminal is realized more accurately.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to a kind of localization method and location-server.
Background technology
As one of characteristic service of mobile communication system, positioning service is considered to a bright spot of following mobile value-added service always, and at present, the main mobile communication carrier of countries and regions such as North America, Europe, Asia-Pacific and Japan and Korea S has all opened positioning service.Positioning service is a business the most attractive in the mobile value-added service, simultaneously also is one of complicated service the most in each link of industrial chain.
Location technology in the mobile communication system is meant some parameter in the radio wave that receives, for example transmission time, amplitude, phase place and the signal angle of arrival (AOA, Angel of Arrival) etc. measure, utilize specific algorithm to calculate, thereby judge the position of testee.Since (the FCC of FCC, Federal Communication Commission) required mobile communication carrier to provide the E-911 emergency assistance services in 1996 for the mobile phone user since, started the research boom of location technology and related service thereof in the world, (3GPP, the 3 for third generation partner program
RdGeneration PartnershipProject), 3GPP2, worldwide interoperability for microwave inserts (WiMAX, Worldwide Interoperability forMicrowave Access), Open Mobile Alliance (OMA, Open Mobile Alliance) various standardization bodies such as, at present still to positioning service (LCS, Location Service) every standard is is constantly formulated and optimized, each mobile communication carrier has also shown keen interest to carrying out of positioning service, therefore, how the people in abundant further modern movable living the accurate localization business is provided is mobile communication carrier's problem demanding prompt solution.
A kind of desirable location technology not only needs the location very accurate, also needs the location very fast, reliably, and this just causes a certain location technology to be difficult to adapt to the needs of whole business scenarios; For example, global positioning system (GPS, Global Positioning System) location technology is very ripe, and the positioning accuracy height, but shortcoming is the terminal that needs to change the user, make it possess the ability that receives gps signal, and locating first needs the long response time, in the serious city that declines of signal and indoor, because gps signal is blocked, make positioning accuracy be subjected to very big influence, even can not finish the location.Therefore, in order to remedy GPS problem of gps signal disappearance during the location in the intensive city of building, produced assistant GPS (A-GPS, AssistedGPS), need network and terminal can both receive gps signal when utilizing A-GPS to position, terminal is positioned in conjunction with base station information and GPS information; For GPS, the location response time of A-GPS shortens greatly, in addition owing to can be in resting state at twice location tempus intercalare A-GPS, so can reduce the energy consumption of terminal, the method of utilizing A-GPS to position can be used for various mobile networks, for example 2G, 3G, CDMA, WiFi and WiMAX etc.; But the shortcoming of utilizing A-GPS to carry out is to carry out the software and hardware transformation to terminal and network side simultaneously, and performance is still lower when carrying out indoor positioning, and Network Transmission repeatedly (can reach one-way transmission at most six times) also can take a large amount of space resourcess.Therefore, the application that utilizes A-GPS to position is subjected to the restriction of following condition: the terminal market occupation rate with A-GPS function is not high, need in the good environment of satellite received signal, can realize the location, therefore also need to adopt other location technology that it is replenished.
In networks such as current widely used 2G, 3G, CDMA, WiMAX and LTE, all developed and manyly utilized that distinctive wireless measurement parameter realizes the technology of location in the network.
Usually the location technology that adopts has: location technologies such as sub-district ID (Cell-ID), enhancing sub-district ID, the time of advent (TOA, Time ofArrival), the time of advent poor (TDOA, Time Difference ofArrival), AOA and field intensity fingerprint.Wherein, Cell-ID location technology and enhancing sub-district ID location technology because cost performance is higher, thereby have obtained using widely.When using TOA location technology and TDOA location technology, adopt the location technology of uplink measurement signal, uplink time-difference of arrival (U-TDOA for example, Uplink Time Difference of Arrival) location technology, the positioning accuracy that can realize is higher, but need dispose a large amount of special measurement unit at network side, and each mainly measures network element and all need carry out software upgrading, it is embodied as the mobile communication carrier that originally is difficult to by general and accepts.Use the location technology of downlink measurement parameter, multiple way of realization is arranged in different networks, such as the location of the enhancing forward link triangle in the cdma network (EFLT, Ehanced Forward Link Trangulation) technology, because used existing wireless measurement parameter, and do not need terminal to increase special measurement function newly, therefore obtain more use; Such as the enhancing observed time difference (E-OTD among the 2G, Enhanced Observed Time Difference) and the observation among the 3G arrive time difference (OTDOA, Observed Time Difference ofArrival), owing to need the special measurement parameter of terminal support, cause application to be subjected to a lot of restrictions.Certainly, AOA above-mentioned and field intensity fingerprint location technology are not high owing to cost performance yet, less being used.
In a word, at the location technology that more often is used, such as strengthening sub-district ID, EFLT etc., it all is the relevant information that can obtain a more than base station according to the measurement parameter of terminal to report, at this moment, can use the many base stations triangle location technology that is similar in TOA location technology and the TDOA location technology to obtain high orientation precision usually.The essence of this many base stations triangle location technology is distance or the range difference that at first estimates terminal and a plurality of base stations, and, finally calculate coordinate as the terminal of unknown number with the coordinate of known base station and the coordinate substitution circular order or the Hyperbolic Equation group of the terminal of the unknown.But the prerequisite of obtaining high orientation precision in this way is the measured value parameter that at first needs sufficient amount, otherwise will can not carry out computing function owing to the equation number quantity not sufficient; Secondly the error of measurement parameter need be within certain scope, otherwise it is bigger to obtain the error of effective result of calculation or result of calculation probably, even also lower than the positioning accuracy of only using the Cell-ID location technology to be obtained in same position; Further, owing in above-mentioned location technology, use many base stations triangle location technology usually, and the geometric distributions of the precision of the account form of this technology and reference point is in close relations, promptly can be subjected to usually said geometric dilution of precision (GDOP, Geometric Dilution of Precision) or Horizontal Dilution of Precision (HDOP, HorizontalDilution ofPrecision) influence, and when the some base stations of terminal distance are nearer, can not obtain GDOP or HDOP preferably usually, therefore generally can not obtain more accurate result of calculation.In the network of having disposed this type of location technology, mobile communication carrier needs certain technical scheme to avoid the problems referred to above.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of localization method and location-server, more accurately realizes the location estimation of terminal.
For achieving the above object, technical scheme of the present invention is achieved in that
The present invention discloses a kind of localization method, comprising:
When the distance between at least one neighbor base station of existence and the serving BS is less than or equal to default base station distance thresholding, maybe between the distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding and terminal and serving BS for closely the time, utilize the location estimation of single base station location technology computing terminal.
In the said method, when described distance between at least one neighbor base station of existence and serving BS is less than or equal to default base station distance thresholding, maybe between the distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding and terminal and serving BS for closely the time before, this method comprises:
Calculate the distance between each neighbor base station and the serving BS respectively, judge whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding;
When the distance between all neighbor base stations and the serving BS during all greater than default base station distance thresholding, this method also comprises:
Whether judge between terminal and the serving BS for closely.
In the said method, this method also comprises:
Distance between all neighbor base stations and serving BS is all greater than default base station distance thresholding, and is between terminal and the serving BS not for closely the time, utilizes the location estimation of many base stations triangle location technology computing terminal.
In the said method, describedly judge whether to exist distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding to be:
Each neighbor base station that calculates and the distance between the serving BS are sorted, and, distance between neighbor base station and the serving BS and base station distance thresholding are compared from wherein minimum distance; Wherein, the base station distance thresholding is that precision lower limit according to many base stations triangle location technology sets in advance.
In the said method, describedly whether judge between terminal and the serving BS for closely being:
In the 2G network, according to the field strength measurement value and the signal quality of serving BS, or according to the field strength measurement value of serving BS, or according to the field strength measurement value of Timing Advance and serving BS, whether judge between terminal and the serving BS for closely.
In the said method, describedly whether judge between terminal and the serving BS for closely being:
In the 3G network, signal level according to serving BS, or according to terminal to distance between the serving BS and service signal of base station level value, or according to terminal to the signal level of the distance between the serving BS, serving BS and the signal level of neighbor base station, whether judge between terminal and the serving BS for closely.
In the said method, describedly whether judge between terminal and the serving BS for closely being:
In the cdma network, according to the pilot frequency intensity of serving BS, or according to terminal to the distance of serving BS and the pilot frequency intensity of serving BS, whether judge between terminal and the serving BS for closely.
In the said method, the location estimation of the single base station of described utilization location technology computing terminal is:
The sign of existing serving BS in the system is added in parameter relevant with serving BS in the location measurement information and the system related data of the Serving cell of input in advance, obtain the location estimation of terminal.
The present invention also discloses a kind of location-server, comprising: judge module, first computing module; Wherein,
Judge module is used for calculating respectively the distance between each neighbor base station and the serving BS, judges whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding; When the distance between all neighbor base stations and the serving BS during, whether judge between terminal and the serving BS for closely all greater than default base station distance thresholding;
Computing module, be used for when the distance between judge module at least one neighbor base station of definite existence and the serving BS is less than or equal to default base station distance thresholding, or determine that distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding when judge module, and for closely the time, utilize the location estimation of single base station location technology computing terminal between terminal and the serving BS.
In the above-mentioned location-server, also comprise:
Second computing module, be used for determining that when judge module distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding, and be between terminal and the serving BS not for closely the time, utilize the location estimation of many base stations triangle location technology computing terminal.
Localization method provided by the invention and location-server, when existing distance between at least one neighbor base station and the serving BS less than default base station distance thresholding, maybe the distance between all neighbor base stations and serving BS is all greater than default base station distance thresholding, and between terminal and the serving BS for closely the time, utilize the location estimation of single base station location technology computing terminal, realized when carrying out the location estimation of unknown terminal, not at single many base stations of the use triangle location technology of all situations, but adopt two kinds of location technologies in light of the circumstances, promptly when between terminal and the base station for closely the time, adopt single base station location technology, thereby overcome in the prior art when adopting many base stations triangle location technology to position estimation for closely the time between terminal and the base station, the location estimation that the error that causes is bigger, thereby can avoid utilizing more complicated many base stations triangle location technology, more accurately realize the location estimation of terminal.
Description of drawings
Fig. 1 is the schematic flow sheet that the present invention realizes localization method;
Fig. 2 is a structural representation of realizing the reference model of localization method in the 2G network of the present invention;
Fig. 3 is a schematic flow sheet of realizing localization method in the 2G network of the present invention;
Fig. 4 is a structural representation of realizing the reference model of localization method in the 3G network of the present invention;
Fig. 5 is a schematic flow sheet of realizing localization method in the 3G network of the present invention;
Fig. 6 is a structural representation of realizing the reference model of localization method in the cdma network of the present invention;
Fig. 7 is a schematic flow sheet of realizing localization method in the cdma network of the present invention;
Fig. 8 is the structural representation of location-server of the present invention.
Embodiment
The present invention is mainly used in sub-district system cellular networks such as 2G network, 3G network, cdma network, LTE network, WiMAX network, WiFi network, its basic thought is: when the distance between at least one neighbor base station of existence and the serving BS is less than or equal to default base station distance thresholding, maybe between the distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding and terminal and serving BS for closely the time, utilize the location estimation of single base station location technology computing terminal.
Below by drawings and the specific embodiments the present invention is described in further detail again.
The invention provides a kind of localization method, Fig. 1 is the schematic flow sheet that the present invention realizes localization method, and as shown in Figure 1, this method may further comprise the steps:
Step 101 is calculated the distance between each neighbor base station and the serving BS respectively, judges whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding, if not, execution in step 102, if, execution in step 103;
Concrete, location-server calculates the distance between each neighbor base station and the serving BS respectively, judges whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding, if not, execution in step 102, if, execution in step 103; In the 2G network and 3G network in location-server be Serving Mobile Location Center (SMLC, Serving Mobile Location Centre), the location-server of cdma network is mobile positioning center (MPC, Mobile Positioning Center).
Whether step 102 is judged between terminal and the serving BS for closely, if, execution in step 103, if not, execution in step 104;
Concrete, whether location-server judge between terminal and the serving BS for closely, if, execution in step 103, if not, execution in step 104.
Step 103 is utilized the location estimation of single base station location technology computing terminal;
Concrete, location-server utilizes the location estimation of single base station location technology computing terminal according to the location measurement information of the terminal of controller transmission; Controller in 2G network and the cdma network is base station controller (BSC, Base Station Controller), and the controller in the 3G network is radio network controller (RNC, Radio Network Controller).
Step 104 is utilized the location estimation of many base stations triangle location technology computing terminal;
Concrete, when not satisfying when utilizing the location estimation of single base station location technology computing terminal, the location measurement information of the terminal that location-server is collected according to controller is utilized the location estimation of many base stations triangle location technology computing terminal; Utilize the location estimation of many base stations triangle location technology computing terminal to be prior art, no longer give unnecessary details herein.
Embodiment one
The application scenarios of present embodiment is the 2G network, and Fig. 2 is a structural representation of realizing the reference model of localization method in the 2G network of the present invention, if realize strengthening sub-district ID location technology in the 2G network, needs to adopt this reference model usually; As shown in Figure 2, LCS client is the requestor that network side is initiated the positioning service flow process, the control of the responsible positioning service flow process of GMLC (GMLC, Gateway Mobile Location Center) and authentication etc.; Interface between LCS client and the GMLC is the interface of the positioning service that externally provides of mobile communication carrier, adopts running fix agreement (MLP, Mobile Location Protocol) the carrying locating request message and the response message of OMA tissue definition; GMLC is by the attaching position register (HLR of signaling interface and core net, Home Location Register) or network element such as MSC communicate, interface between GMLC and HLR, GMLC and MSC, HLR and the MSC defines in the 3GPP standard, for example, and TS23.271 and TS29.002 standard; By and HLR between interface, GMLC can obtain the current routing iinformation of terminal, and can by and MSC between interface initiate Location Request; After MSC receives Location Request, by and BSC between interface it is forwarded in the Access Network, and BSC further is forwarded to SMLC with the location measurement information of the terminal of Location Request and collection by the Lb interface, by the location estimation of SMLC computing terminal.
Fig. 3 is a schematic flow sheet of realizing localization method in the 2G network of the present invention, and as shown in Figure 3, this method may further comprise the steps:
Step 301, BSC sends to SMLC with the location measurement information of terminal;
Concrete, terminal is the measurement and positioning metrical information in real time, and when terminal was in talking state, BSC can collect the location measurement information of sufficient amount, and the location measurement information of collecting is sent to SMLC by locating request message; Or, when terminal is in idle condition, BSC does not temporarily collect location measurement information, this moment, SMLC sent message to BSC, request BSC measures the location measurement information of terminal, after the BSC request of receiving the location measurement information of terminal is measured, and the location measurement information of measuring is sent to SMLC by locating request message;
The parameter that described location measurement information comprises is as shown in table 1:
Table 1
Step 302, SMLC calculates the distance between each neighbor base station and the serving BS respectively, judges whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding, if not, execution in step 303, if, execution in step 304;
Concrete, the sign of the sign of existing base station data, serving BS, adjacent base station obtains all longitude and latitude data of relevant base station in the gsm system of SMLC according to the 2G network; Wherein, base station data comprises the corresponding relation of the sign and the longitude and latitude data of each base station; If described longitude and latitude data are the latitude and longitude value in the geodetic coordinate system, can pass through conversion formula, latitude and longitude value in the geodetic coordinate system is transformed into coordinate figure in the rectangular coordinate system, uses coordinate figure in the rectangular coordinate system to calculate distance between each neighbor base station and the serving BS respectively then;
The distance that SMLC will calculate sorts, and from minimum the distance, distance between neighbor base station and the serving BS and base station distance thresholding are compared, the base station distance thresholding is that the precision lower limit according to many base stations triangle location technology sets in advance in SMLC, for example be limited to 100 meters or 200 meters etc. under the precision of many base stations triangle location technology, then the base station distance thresholding is 100 meters or 200 meters; In case distance between neighbor base station and the serving BS is arranged greater than the base station distance thresholding, then stops to judge; Otherwise, do not stop to judge; After judging end, if exist the distance between at least one neighbor base station and the serving BS to be less than or equal to the base station distance thresholding, then execution in step 304; If the distance between all neighbor base stations and the serving BS is all greater than the base station distance thresholding, then execution in step 303.
Step 303, whether SMLC judge between terminal and the serving BS for closely according to location measurement information, if, execution in step 304, if not, execution in step 305;
Concrete, whether SMLC judges between terminal and the serving BS for closely according to the field strength measurement value of the serving BS in the location measurement information and signal quality; For example, when the bit error rate of signal quality about 0.1%, and the field strength measurement value of serving BS is during greater than-55dBm, SMLC determines between terminal and the serving BS for closely;
Or whether SMLC judges between terminal and the serving BS for closely according to the field strength measurement value of the serving BS in the location measurement information; For example, when the field strength measurement value of serving BS during greater than-50dBm, SMLC determines between terminal and the serving BS for closely;
Or whether SMLC judges between terminal and the serving BS for closely according to the field strength measurement value of TA value in the location measurement information and serving BS; For example, when the TA value equals 0, and the field strength measurement value of serving BS is during greater than-60dBm, and SMLC determines between terminal and the serving BS for closely; Or when the TA value equals 1, and the field strength measurement value of serving BS is greater than-65dBm, and the field strength measurement value of a neighbor base station of field strength measurement value maximum is during less than-90dBm, and SMLC determines between terminal and the serving BS for closely;
When SMLC determines between terminal and the serving BS for closely the time execution in step 304; When above-mentioned condition did not satisfy, SMLC determined between terminal and the serving BS not for closely, execution in step 305; In addition, the field strength measurement value of serving BS, signal quality, the threshold value of TA value when judging can be adjusted according to the difference of actual conditions.
Step 304, SMLC utilizes the location estimation of single base station location technology computing terminal according to the location measurement information of receiving;
Concrete, SMLC utilizes single base station location technology to carry out the location estimation of terminal, the sign that is about to existing serving BS in the gsm system adds the related data of the Serving cell of importing in advance in parameter relevant with serving BS in the location measurement information and the gsm system, obtains the location estimation of terminal after the above-mentioned three class data additions; Wherein, the parameter relevant with serving BS comprises the field strength measurement value of AT value, serving BS and signal quality etc.; The related data of Serving cell comprises the axis of cell coverage area and the angle of direct north, the subtended angle of cell coverage area, radius of cell coverage area etc.
Step 305, SMLC utilizes the location estimation of many base stations triangle location technology computing terminal according to the location measurement information of receiving.
Embodiment two
The application scenarios of present embodiment is a 3G network, Fig. 4 is a structural representation of realizing the reference model of localization method in the 3G network of the present invention, if in 3G network, realize strengthening sub-district ID location technology, for example, the Cell ID+RTT location technology of the WCDMA system of 3G network or the CellID+TA location technology in the TD-SCDMA system all will adopt this reference model usually; As shown in Figure 4, similar in the function of network elements such as LCS client, GMLC, HLR, MSC, SGSN and the reference model of 2G network, the interface between them also is that the corresponding interface in the reference model with the 2G network is similar; By and HLR between interface, GMLC obtains the current routing iinformation of terminal, and can by and MSC/SGSN between interface initiate Location Request, after MSC/SGSN receives Location Request, by and RNC between interface it is forwarded in the Access Network, RNC can say that further Location Request and location measurement information are forwarded to SMLC by the Iupc interface, by the location estimation of SMLC computing terminal.
Fig. 5 is a schematic flow sheet of realizing localization method in the 3G network of the present invention, and as shown in Figure 5, this method may further comprise the steps:
Step 501, RNC sends to SMLC with the location measurement information of terminal;
Concrete, RNC initiates to measure control request to terminal, and the requesting terminal provides time difference measurements parameters R xTx, this parameter signal propagation time between terminal and the serving BS that is used to convert; RNC initiates to measure control request to NodeB, request NodeB provide round-trip delay (RTT, Round Trip Time) parameter, and the RxTx that provides in conjunction with terminal is provided this parameter, signal propagation time between computing terminal and the serving BS, and and then conversion terminal and serving BS between distance; In mutual between above-mentioned RNC and the NodeB, can also the picked up signal quality etc. measurement result; RNC sends to SMLC as location measurement information by the Iupc interface with the information that obtains;
The parameter that location measurement information comprises is as shown in table 2:
Table 2
Step 502, SMLC calculates the distance between each neighbor base station and the serving BS respectively, judges whether to exist the distance between at least one base station and the serving BS to be less than or equal to default base station distance thresholding, if not, execution in step 503, if, execution in step 504;
Concrete, SMLC according to the sign of the sign of existing base station data, serving BS in the UMTS system of 3G network, adjacent base station obtain whole relevant base stations the longitude and latitude data; Wherein, base station data comprises the corresponding relation of the sign and the longitude and latitude data of each base station; When having comprised the antenna for base station three-dimensional location coordinates in the location measurement information, just do not need to rely on the base station data of UMTS system; If described longitude and latitude data are the latitude and longitude value in the geodetic coordinate system, can pass through conversion formula, latitude and longitude value in the geodetic coordinate system is transformed into coordinate figure in the rectangular coordinate system, uses coordinate figure in the rectangular coordinate system to calculate distance between each neighbor base station and the serving BS respectively then;
The distance that SMLC will calculate sorts, and from minimum the distance, distance between neighbor base station and the serving BS and base station distance thresholding are compared, the base station distance thresholding is that the precision lower limit according to many base stations triangle location technology sets in advance in SMLC, for example be limited to 100 meters or 200 meters etc. under the precision of many base stations triangle location technology, then the base station distance thresholding is 100 meters or 200 meters; In case distance between neighbor base station and the serving BS is arranged greater than the base station distance thresholding, then stops to judge; Otherwise, do not stop to judge; After judging end, if exist the distance between at least one neighbor base station and the serving BS to be less than or equal to the base station distance thresholding, then execution in step 504; If the distance between all neighbor base stations and the serving BS is all greater than the base station distance thresholding, then execution in step 503.
Step 503, whether SMLC judge between terminal and the serving BS for closely according to location measurement information, if, execution in step 504, if not, execution in step 505;
Concrete, whether SMLC judges between terminal and the serving BS for closely according to the signal level of the serving BS in the location measurement information and signal to noise ratio; For example, when the value of signal to noise ratio more than 48, and the signal level value of serving BS is greater than 80 o'clock, SMLC determines between terminal and the serving BS for closely;
Or whether SMLC judges between terminal and the serving BS for closely according to the signal level of the serving BS in the location measurement information; For example, when the signal level value of serving BS greater than 85 the time, SMLC determines between terminal and the serving BS for closely;
Or whether SMLC judges between terminal and the serving BS for closely to the distance between the serving BS and service signal of base station level value according to the terminal in the location measurement information; For example, when terminal to the distance between the serving BS less than 150 meters, and the signal level value of serving BS is greater than 75 o'clock, SMLC determines between terminal and the serving BS for closely;
Or whether SMLC judges between terminal and the serving BS for closely to the signal level of the signal level of the distance between the serving BS, serving BS and neighbor base station according to the terminal in the location measurement information; For example, when terminal to the distance between the serving BS less than 200 meters, and the signal level value of serving BS is greater than 80, and the signal level value of the strongest neighbor base station of signal is less than 30 o'clock, SMLC determines between terminal and the serving BS for closely;
When SMLC determines between terminal and the serving BS for closely the time execution in step 504; When above-mentioned condition did not satisfy, SMLC determined between terminal and the serving BS not for closely, execution in step 505; In addition, the signal level of serving BS, signal to noise ratio, terminal can be adjusted according to the difference of actual conditions to the threshold value of the signal level of the distance between the serving BS, neighbor base station.
Step 504, SMLC utilizes the location estimation of single base station location technology computing terminal according to the location measurement information of receiving;
Concrete, SMLC utilizes single base station location technology to carry out the location estimation of terminal, the sign that is about to existing serving BS in the UMTS system adds the related data of the Serving cell of importing in advance in parameter relevant with serving BS in the location measurement information and the UMTS system, obtains the location estimation of terminal after the above-mentioned three class data additions; Wherein, the parameter relevant with serving BS comprises that terminal is to the signal level of the distance between the serving BS, serving BS and signal to noise ratio etc.; The related data of Serving cell comprises the axis of cell coverage area and the angle of direct north, the subtended angle of cell coverage area, radius of cell coverage area etc.
Step 505, SMLC utilizes the location estimation of many base stations triangle location technology computing terminal according to the location measurement information of receiving.
Embodiment three
The application scenarios of present embodiment is a cdma network, and Fig. 6 is a structural representation of realizing the reference model of localization method in the cdma network of the present invention, if realize the EFIT location technology in cdma network, needs to adopt this reference model usually; As shown in Figure 6, the function of network elements such as LCS client, MPC, HLR, MSC similar with in the reference model of above-mentioned two location technologies; Wherein, the way of realization of the L1 interface between LCS client and the MPC is identical with the way of realization of GMLC among above-mentioned two embodiment and the Le interface between the LCS client; By and HLR between interface, MPC can obtain the current routing iinformation of terminal, and can by and MSC between interface initiate Location Request; After MSC receives Location Request, can by and BSC between interface it is forwarded in the Access Network, and BSC further can return to MSC by the parameter that the pilot energy measurement report that is used for switch decision of terminal to report is collected; MSC sends to MPC by return messages with the parameter in the measurement report again, and the location estimation of MPC computing terminal is arranged.
Fig. 7 is a schematic flow sheet of realizing localization method in the cdma network of the present invention, and as shown in Figure 7, this method may further comprise the steps:
Step 701, MSC sends to MPC with the location measurement information of terminal;
Concrete, BSC initiates to measure control request to terminal, and the requesting terminal provides the pilot energy measurement report; BSC will send to MSC from the parameter the pilot energy measurement report that terminal obtains, and MSC sends to MPC with the location measurement information of the parameter in the pilot energy measurement report as terminal by return messages;
The parameter of described location measurement information is as shown in table 3:
Table 3
Step 702, MPC calculates the distance between each neighbor base station and the serving BS respectively, judges whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding, if not, execution in step 703, if, execution in step 704;
Concrete, MPC according to the sign of the sign of existing base station data, serving BS in the cdma system, adjacent base station obtain whole relevant base stations the longitude and latitude data; Wherein, base station data comprises the corresponding relation of the sign and the longitude and latitude data of each base station; If described longitude and latitude data are the latitude and longitude value in the geodetic coordinate system, can pass through conversion formula, latitude and longitude value in the geodetic coordinate system is transformed into coordinate figure in the rectangular coordinate system, uses coordinate figure in the rectangular coordinate system to calculate distance between each neighbor base station and the serving BS respectively then;
The distance that MPC will calculate sorts, and from minimum the distance, distance between neighbor base station and the serving BS and base station distance thresholding are compared, the base station distance thresholding is that the precision lower limit according to many base stations triangle location technology sets in advance in MPC, for example be limited to 100 meters or 200 meters etc. under the precision of many base stations triangle location technology, then the base station distance thresholding is 100 meters or 200 meters; In case distance between neighbor base station and the serving BS is arranged greater than the base station distance thresholding, then stops to judge; Otherwise, do not stop to judge; After judging end, if exist the distance between at least one neighbor base station and the serving BS to be less than or equal to the base station distance thresholding, then execution in step 704; If the distance between all neighbor base stations and the serving BS is all greater than the base station distance thresholding, then execution in step 703.
Step 703, whether MPC judge between terminal and the serving BS for closely according to location measurement information, if, execution in step 704, if not, execution in step 705;
Concrete, whether MPC judges between terminal and the serving BS for closely according to the pilot frequency intensity of the serving BS in the location measurement information; For example, when the value of the pilot frequency intensity of serving BS greater than 60 the time, MPC determines between terminal and the serving BS for closely;
Or whether MPC according to judging between terminal and the serving BS for closely to the pilot frequency intensity of the distance of serving BS and serving BS according to the convert terminal obtain of CDMA Serving One Way Delay parameter in the location measurement information; For example, when terminal to the distance of serving BS less than 150 meters, and the value of the pilot frequency intensity of serving BS is greater than 55 o'clock, MPC determines between terminal and the serving BS for closely;
When MPC determines between terminal and the serving BS for closely the time execution in step 704; When above-mentioned condition did not satisfy, MPC determined between terminal and the serving BS not for closely, execution in step 705; In addition, the pilot frequency intensity of serving BS, terminal can be adjusted according to the difference of actual conditions to the threshold value of distance when judging of serving BS.
Step 704, MPC utilizes the location estimation of single base station location technology computing terminal according to the location measurement information of receiving;
Concrete, MPC utilizes single base station location technology to carry out the location estimation of terminal, the sign that is about to existing serving BS in the cdma system adds the related data of the Serving cell of importing in advance in parameter relevant with serving BS in the location measurement information and the gsm system, obtains the location estimation of terminal after the above-mentioned three class data additions; Wherein, the parameter relevant with serving BS comprises that terminal is to pilot frequency intensity of the distance between the serving BS, serving BS etc.; The related data of Serving cell comprises the axis of cell coverage area and the angle of direct north, the subtended angle of cell coverage area, radius of cell coverage area etc.
Step 705, MPC utilizes the location estimation of many base stations triangle location technology computing terminal according to the location measurement information of receiving.
For realizing said method, the present invention also provides a kind of location-server, and Fig. 8 is the structural representation of location-server of the present invention, and as shown in Figure 8, this location-server comprises: judge module 81, first computing module 82; Wherein,
This location-server also comprises:
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done 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 (10)
1. a localization method is characterized in that, this method comprises:
When the distance between at least one neighbor base station of existence and the serving BS is less than or equal to default base station distance thresholding, maybe between the distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding and terminal and serving BS for closely the time, utilize the location estimation of single base station location technology computing terminal.
2. method according to claim 1, it is characterized in that, when described distance between at least one neighbor base station of existence and serving BS is less than or equal to default base station distance thresholding, maybe between the distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding and terminal and serving BS for closely the time before, this method comprises:
Calculate the distance between each neighbor base station and the serving BS respectively, judge whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding;
When the distance between all neighbor base stations and the serving BS during all greater than default base station distance thresholding, this method also comprises:
Whether judge between terminal and the serving BS for closely.
3. method according to claim 1 and 2 is characterized in that, this method also comprises:
Distance between all neighbor base stations and serving BS is all greater than default base station distance thresholding, and is between terminal and the serving BS not for closely the time, utilizes the location estimation of many base stations triangle location technology computing terminal.
4. method according to claim 2 is characterized in that, describedly judges whether to exist distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding to be:
Each neighbor base station that calculates and the distance between the serving BS are sorted, and, distance between neighbor base station and the serving BS and base station distance thresholding are compared from wherein minimum distance; Wherein, the base station distance thresholding is that precision lower limit according to many base stations triangle location technology sets in advance.
5. whether method according to claim 2 is characterized in that, describedly judge between terminal and the serving BS for closely being:
In the 2G network, according to the field strength measurement value and the signal quality of serving BS, or according to the field strength measurement value of serving BS, or according to the field strength measurement value of Timing Advance and serving BS, whether judge between terminal and the serving BS for closely.
6. whether method according to claim 2 is characterized in that, describedly judge between terminal and the serving BS for closely being:
In the 3G network, signal level according to serving BS, or according to terminal to distance between the serving BS and service signal of base station level value, or according to terminal to the signal level of the distance between the serving BS, serving BS and the signal level of neighbor base station, whether judge between terminal and the serving BS for closely.
7. whether method according to claim 2 is characterized in that, describedly judge between terminal and the serving BS for closely being:
In the cdma network, according to the pilot frequency intensity of serving BS, or according to terminal to the distance of serving BS and the pilot frequency intensity of serving BS, whether judge between terminal and the serving BS for closely.
8. method according to claim 1 is characterized in that, the location estimation of the single base station of described utilization location technology computing terminal is:
The sign of existing serving BS in the system is added in parameter relevant with serving BS in the location measurement information and the system related data of the Serving cell of input in advance, obtain the location estimation of terminal.
9. a location-server is characterized in that, comprising: judge module, first computing module; Wherein,
Judge module is used for calculating respectively the distance between each neighbor base station and the serving BS, judges whether to exist the distance between at least one neighbor base station and the serving BS to be less than or equal to default base station distance thresholding; When the distance between all neighbor base stations and the serving BS during, whether judge between terminal and the serving BS for closely all greater than default base station distance thresholding;
Computing module, be used for when the distance between judge module at least one neighbor base station of definite existence and the serving BS is less than or equal to default base station distance thresholding, or determine that distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding when judge module, and for closely the time, utilize the location estimation of single base station location technology computing terminal between terminal and the serving BS.
10. location-server according to claim 9 is characterized in that, this location-server also comprises:
Second computing module, be used for determining that when judge module distance between all neighbor base stations and the serving BS is all greater than default base station distance thresholding, and be between terminal and the serving BS not for closely the time, utilize the location estimation of many base stations triangle location technology computing terminal.
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