CN101316439A - Server device, mobile terminal and location mode selection method - Google Patents
Server device, mobile terminal and location mode selection method Download PDFInfo
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- CN101316439A CN101316439A CNA2007101085204A CN200710108520A CN101316439A CN 101316439 A CN101316439 A CN 101316439A CN A2007101085204 A CNA2007101085204 A CN A2007101085204A CN 200710108520 A CN200710108520 A CN 200710108520A CN 101316439 A CN101316439 A CN 101316439A
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Abstract
The invention provides a server device, a mobile terminal and a method for selecting locating modes; the method for selecting locating modes can select a locating mode with a small error from all available locating modes under a situation that the location can not be implemented by using GPS alone; a computing server (300) estimates the position of the mobile terminal (100) receives the signals from GPS satellites and communicates with base stations; the computing server (300) is provided with a locating information analyzing part (302) which chooses and uses either a cell/section locating mode or a hybrid locating mode according to the distance between a honeycomb base station (200) and the mobile terminal (100); and a location detecting part (303) which uses the locating mode chosen by the locating information analyzing part (302) to calculate the location of the mobile terminal (100).
Description
Technical field
The present invention relates to from a plurality of locate modes, select a kind of server unit, portable terminal and location mode selection method of locate mode.
Background technology
Always, following localization method is disclosed: built-in GPS receiver in portable terminal, use from the signal of gps satellite separately or use from the signal of gps satellite with from the signal of cellular basestation and determine terminal location (for example, with reference to patent documentation 1).At the outdoor environment that does not have barrier, portable terminal can receive the signal from gps satellite fully, can receive the signal from gps satellite more than 4 in most of place.
In the location of having used GPS, because therefore three-dimensional location coordinates X, Y, Z and be unknown in the time of reception of terminal need the signal of reception from least 4 gps satellites.That is, if can then can only determine the position from the gps satellite received signal more than 4 with GPS.
In addition, because portable terminal is used for various places, for example in the corridor, building or the indoor portable terminal that also uses.In such environment, portable terminal can not be caught the faintness wave (signal) from gps satellite, many times can only be from the gps satellite received signal of 4 of less thaies.Like this if can only then can not only measure the position of portable terminal from the gps satellite received signal of 4 of less thaies by gps satellite.
As the countermeasure of this situation, following mixing (hybrid) locate mode is disclosed, even can only also can measure the position of portable terminal from the gps satellite received signal of 4 of less thaies.By the mixed positioning mode, this method is not only to carry out position calculation with GPS, but cellular basestation is handled as one of signal transmission source.
Particularly, the reception by measuring the signal that sends from cellular basestation is regularly handled cellular basestation with gps satellite thus comparably, makes signal number be not less than 4.Therefore, thus can measure the position of portable terminal in various places.In addition, as special circumstances, even under the situation of the signal that does not have to receive from gps satellite, if can receive the signal that sends from the base station more than 4, then also can be by the position of same method mensuration portable terminal.
In said method, the signal source quantity that requires receivable GPS and cellular basestation is more than 4.The receivable signal source quantity of portable terminal is because of the situation around the portable terminal is different, signal number also arranged less than 4 situation.
As the countermeasure of this situation, disclose sub-district (cell)/sector (sector) locate mode.Particularly, the position calculation with the cellular basestation at portable terminal place is the position of portable terminal.If cellular basestation by sectorization, then can use the center of this sector.In addition, in the time can measuring RTT (Round Trip Time), can calculate the distance between cellular basestation～portable terminal, therefore also can measure the position of portable terminal with this distance and sector auxiliary information.Having used the mobile terminal locating method of cell/section locate mode to be used as can't be with the compensation process in the place of GPS location or mixed positioning.If the service area of portable terminal (service area) then is the method that can measure the position of portable terminal.
As mentioned above, the locate mode of portable terminal has multiple mode, has disclosed the method (for example, with reference to non-patent literature 1) of switching GPS location, mixed positioning or cell/section location according to the environment for use of portable terminal.
In non-patent literature 1, judge the switching of locate mode according to receivable signal source.Particularly,, signal source quantity selects GPS location or mixed positioning if being more than 4, if 4 of less thaies then select the cell/section location.
[patent documentation 1] spy opens the 2005-20216 communique
P.43-54, [non-patent literature 1] " high accuracy location Port ジ シ ヨ ニ Application グ シ ス テ system ying with と サ one PVC ス exhibition Open " シ Application Port ジ ウ system テ キ ス ト puts down on March 3rd, 18 Machine tool Xing that shakes and can sponsor by the underground 2 Bands ホ of Museum one Le: East capital branch of the team legal person Electricity of society feelings Reported communication association
Summary of the invention
The positioning accuracy of cell/section location is than GPS location or mixed positioning low precision.Therefore, selected cell/section to locate in the receivable signal source quantity of portable terminal less than 4 o'clock.
Yet, when portable terminal is positioned at the corridor, building or when indoor etc., the signal degradation that portable terminal receives when receiving from the signal of cellular basestation even receivable sometimes signal number is more than 4, can not obtain sufficient positioning accuracy by GPS location or mixed positioning.
On the other hand, the portable terminal quantity that is positioned at sub-district (sector) is many more, be that cell density is high more, and then the positioning accuracy of cell/section location is just high more.Just, there is proportionate relationship between radius of society and the positioning accuracy.Therefore, in the little city of radius of society, in the corridor, building or indoor etc. when using mixed positioning, compare with the cell/section location, positioning accuracy is poorer sometimes.
Therefore, the present invention proposes in view of above problem, and its purpose is to be provided at server unit, portable terminal and the location mode selection method of the locate mode that suitably Select Error is little from available locate mode under the independent situation that can't measure mobile terminal locations with GPS.
In order to achieve the above object, first feature of the present invention is, a kind of server unit, it is estimated the position that receives the portable terminal that communicates from the signal of gps satellite and with the base station, this server unit has: (a) locating information analysis unit, it selects to use a certain locate mode in cell/section location or the mixed positioning according to the distance between base station and the portable terminal; (b) position detection part, it uses the locate mode of being selected by the locating information analysis unit, calculates the position of portable terminal.
According to the server unit of first feature, can be under the situation that can't implement to locate with GPS separately from available locate mode, the locate mode that Select Error is little.
In addition, in the server unit of first feature, also can determine distance according to the two-way time between described base station and the described portable terminal.
In addition, the locating information analysis unit of the server unit of first feature also can calculate the threshold value of regulation according to the evaluated error of the evaluated error of cell/section location and mixed positioning, the threshold value and the distance of this regulation are compared, under the distance situation littler, select the cell/section location than defined threshold.
Second feature of the present invention is, a kind of portable terminal, it receives the signal from gps satellite, and communicate with the base station, this portable terminal has: (a) locating information analysis unit, it selects to use a certain locate mode in cell/section location or the mixed positioning according to the distance between base station and the portable terminal; (b) position detection part, it uses the locate mode of being selected by the locating information analysis unit, calculates the position of portable terminal.
The 3rd feature of the present invention is, a kind of location mode selection method, it selects the locate mode used when the position that receives the portable terminal that communicates from the signal of gps satellite and with the base station estimated, this location mode selection method comprises the steps: (a) according to the distance between base station and the portable terminal, selects to use a certain locate mode in cell/section location or the mixed positioning; (b) use selected locate mode, calculate the position of portable terminal.
According to the present invention, can provide can be under the situation that can't measure separately mobile terminal locations with GPS server unit, portable terminal and the location mode selection method of the locate mode that suitably Select Error is little from available locate mode.
Description of drawings
Fig. 1 is the structured flowchart of the communication system of present embodiment.
Fig. 2 is the flow chart of system of selection of the locate mode of expression present embodiment.
Fig. 3 is the figure that is used to illustrate the sector ID locate mode of present embodiment.
Fig. 4 is the curve chart of position estimation error and the analog result of the position estimation error that obtains by mixed positioning of the cell/section location of expression present embodiment.
Fig. 5 is the key diagram of the sub-district ID locate mode of present embodiment.
Fig. 6 is the key diagram of the RTT locate mode of present embodiment.
Fig. 7 is the mount structure figure of the communication system of modification.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.In the record of the following drawings, for the identical or similar label of identical or similar part mark.Wherein, it should be noted that accompanying drawing is a schematic diagram.
(structure of communication system)
The communication system of present embodiment possesses: portable terminal 100, and its reception communicates from the signal of gps satellite and with cellular basestation 200; Cellular basestation 200; And calculation server 300, its position to portable terminal 100 is estimated.
In addition, cellular communication portion 102 uses wireless communication line, sends gps satellite information and the base station information that is kept in the data store 103 via cellular basestation 200 to calculation server 300.
The gps satellite information that data store 103 storages are sent from GPS acceptance division 101.In addition, data store 103 is stored the base station information that sends from cellular communication portion 102.
The two-way time (RTT) that cellular basestation 200 is measured between base station～portable terminal.Cellular basestation 200 when receiving the request signal of RTT mensuration, sends the request signal of measuring beginning to portable terminal 100 from calculation server 300.Cellular basestation 200 is regularly measured RTT by measuring to send regularly and receive.Send the measurement result of RTT to calculation server 300 by network.
The needed information of position finding (calculating) that calculation server 300 is collected portable terminal 100, the position of calculating portable terminal 100.Portable terminal 100 sends to portable terminal 100 with result of calculation.Calculation server 300 has server communication portion 301, locating information analysis unit 302 and position detection part 303.
Then, server communication portion 301 is from the position calculation result of position detection part 303 mobile terminal receives 100.Server communication portion 301 sends to portable terminal 100 by cellular basestation 200 with the position calculation result who receives.
Locating information analysis unit 302 is selected preferred orientation according to gps satellite information, base station information and RTT measurement result.In the present embodiment, use GPS location, three kinds of modes of mixed positioning and cell/section location.
302 pairs of location positioning errors based on these three kinds of locate modes of locating information analysis unit are estimated.In order to carry out this estimation, use the gps satellite number and base station number, the reception timing of signal and configuration, place sector auxiliary information and the RTT measurement result of satellite and base station that can be used for position calculation.About the system of selection of this method of estimation and locate mode, will narrate in the back.
(location mode selection method)
Below, use Fig. 2 that the system of selection of the locate mode of present embodiment is described.
At first, the locating information analysis unit 302 indicating positions test sections 303 of calculation server 300 are attempted utilizing GPS to locate (S201) separately.Then, but position detection part 303 utilizes gps satellite number portable terminal 100 received signals, that be may observe and position error judgement, and judgement could be carried out GPS and locate (S202) separately.
At step S202, can carry out GPS when locating separately, locating information analysis unit 302 selects the GPS location as locate mode.Position detection part 303 uses the GPS location to carry out the position calculation of portable terminal 100, end process (S208).
On the other hand, at step S202, can not carry out GPS when locating separately, position detection part 303 entrusts RTT to measure by server communication portion 301 to cellular basestation 200.Cellular basestation 200 is measured RTT (S203).
Then, locating information analysis unit 302 200 receives base station information (base station IDs, sector number) and RTT measurement results (S204) from the base station.Then, locating information analysis unit 302 is obtained cell/section according to method described later and is located effective threshold X (S205) according to base station IDs, sector number.The relation of obtaining RTT and position error (cell/section location and mixed positioning) by prior enforcement simulation decides threshold X.
302 couples of RTT that measured of locating information analysis unit and threshold X compare (S206).In step S206, under the RTT situation littler than X, locating information analysis unit 302 is selected the cell/section location.Position detection part 303 uses the cell/section location to carry out the position calculation of portable terminal 100, and end process (S209).
On the other hand, in step S206, be X when above at RTT, utilize observable satellite number, observable base station number and position error to judge, judge and could carry out mixed positioning (S207).In step S207, in the time can carrying out mixed positioning, locating information analysis unit 302 is selected mixed positioning.Position detection part 303 uses mixed positioning to carry out the position calculation of portable terminal 100, and end process (S210).
On the other hand, when can not carry out mixed positioning in step S207 the time, locating information analysis unit 302 is selected the cell/section location.Position detection part 303 uses the cell/section location to carry out the position calculation of portable terminal 100, end process (S210).
Below, an example of the computational methods of the threshold X among the description of step S205.In the calculating of threshold X, calculate the evaluated error of cell/section location and the evaluated error of mixed positioning, obtain the intersection point of these range performance curves.
At first, the computational methods of the position estimation error E_sector of cell/section location are narrated.As shown in Figure 3, in cell/section location, obtain portable terminal 100 places the sector position of centre of gravity and with it as positioning result.Then, obtain in the sector have a few and the distance of the position of centre of gravity of sector.Because this distance is the evaluated error at each point.To just draw average evaluated error E_sector in the sector divided by the sector area after the evaluated error addition of each point.
On the other hand, the following evaluated error that calculates mixed positioning.In mixed positioning, utilize the distance between the cellular basestation～portable terminal that calculates according to the distance between the gps satellite～portable terminal of calculating with according to the RTT between cellular basestation～portable terminal, carry out 3 limits and measure from the reception timing ga(u)ge of the signal of gps satellite.
Here, consider the mixed positioning of having utilized the RTT between 2 gps satellites and 1 cellular basestation～portable terminal.If the range error of establishing between gps satellite～portable terminal is σ _ GPS1, σ _ GPS2, the range error of establishing between cellular basestation～portable terminal is σ _ BS, then can use the position estimation error E_Hybrid in formula (1) the expression mixed positioning.
E_Hybrid={ (σ _ GPS1)
2+ (σ _ GPS2)
2+ (σ _ BS)
2}
1/2... formula (1)
About σ _ GPS1, σ _ GPS2, σ _ BS, can be by repeatedly measuring to use its RMS (RootMean Square: root mean square).In addition, also can use the value that obtains by experience to estimate σ _ GPS1, σ _ GPS2, σ _ BS.
Fig. 4 represents an example of the analog result of position estimation error E_sector in the cell/section location and the position estimation error E_Hybrid in the mixed positioning.As shown in Figure 4, E_sector and E_Hybrid have intersection point as can be known.The threshold X of this moment is just used the value of this intersection point.
In addition, in the system of selection of above-mentioned locate mode, locate as cell/section, the situation of using the sector ID locate mode has been described, in this sector ID locate mode, obtain the portable terminal place the sector position of centre of gravity and with this position of centre of gravity as positioning result, and, also can use other modes as the cell/section location.
For example, Fig. 5 has represented to use the situation of sub-district ID locate mode.In the ID locate mode of sub-district, calculate the centre coordinate of sub-district according to latitude, longitude, sub-district, the place ID of base station.That is, the coordinate with the base station carries out estimation approach as the position of portable terminal.
In addition, Fig. 6 has represented to use the situation of RTT locate mode.In the RTT locate mode, be that the circle that will calculate according to RTT and the intersection point of sector center line carry out estimation approach as the position of portable terminal.
In addition, in the step S209 of Fig. 2, when having selected the location, sector, also can be according to observable gps satellite number, the base station number that can measure RTT or sub-district kind, from above-mentioned sector ID locate mode, sub-district ID locate mode, RTT locate mode, select to use any locate mode in detail.As the sub-district kind, for example can enumerate is sector cell or whole sub-district.
(modification)
Then, use Fig. 7 that the modification of the communication system of present embodiment is described.As shown in Figure 7, in the communication system of modification, portable terminal 400 is collected the required information of selection of locate mode.That is, portable terminal 400 is selected preferred orientation according to the measurement result of observable gps satellite number, observable base station number and RTT, carries out the position calculation of portable terminal 400.
The communication system of modification has cellular basestation 200, portable terminal 400 and information server 500.
In addition, cellular basestation 200 sends the measurement result of RTT to portable terminal 400 by wireless communication line.
In addition, cellular communication portion 402 receives the RTT measurement result from cellular basestation 200.Cellular communication portion 402 sends the RTT measurement result that receives from cellular basestation 200 to locating information analysis unit 403.
Locating information analysis unit 403 is selected preferred orientation according to gps satellite information, base station information and RTT measurement result.As locate mode, adopt GPS location, mixed positioning, location, sector as mentioned above.
302 pairs of locating information analysis units utilize the location positioning error of these three kinds of locate modes to estimate.In order to carry out this estimation, the reception of adopting the gps satellite number that can be used for position calculation and base station number, signal regularly with configuration, place sector auxiliary information and the RTT measurement result of satellite and base station.About location mode selection method, with illustrated in fig. 2 the same.
Selected locate mode is carried out the position calculation of portable terminal 400 in the position detection part 404 use locating information analysis units 403.
Therefore the location mode selection method of modification omits its explanation here owing to the same with flow chart shown in Figure 2.
(effect and effect)
According to system of selection based on the locate mode of the calculation server 300 of present embodiment, portable terminal 100, can be according to the distance between cellular basestation 200 and the portable terminal 100, select to use a certain locate mode in cell/section location or the mixed positioning, and use selected locate mode to calculate the position of portable terminal 100.
Therefore, can be under the situation that separately can't implement to locate with GPS from available locate mode the little locate mode of Select Error.
In addition, also can directly use RTT to replace distance between cellular basestation 200 and the portable terminal 100.
In addition, in the present embodiment, calculate the threshold value of regulation according to the evaluated error of the evaluated error of cell/section location and mixed positioning.And, the threshold value of this regulation and the distance between cellular basestation～portable terminal are compared, under this distance situation littler, select the cell/section location than defined threshold.
Thought the cell/section locating accuracy than mixed positioning difference in the past, but in the less city of cell size etc., the good situation of cell/section locating accuracy was arranged also.In the present embodiment, also can select the little locate mode of position error in this case.
In addition, when selecting locate mode,, can also select locate mode according to the sub-district kind of base station except distance.For example, by selecting locate mode, can select more realistic preferred orientation according to sector cell or whole sub-district.
Claims (5)
1. server unit, it is estimated the position that receives the portable terminal that communicates from the signal of gps satellite and with the base station, it is characterized in that,
Possess:
The locating information analysis unit, it selects to use a certain locate mode in cell/section location or the mixed positioning according to the distance between described base station and the described portable terminal; With
Position detection part, it uses the locate mode of being selected by described locating information analysis unit, the position of calculating described portable terminal.
2. server unit according to claim 1 is characterized in that,
According to the two-way time between described base station and the described portable terminal, determine described distance.
3. server unit according to claim 1 and 2 is characterized in that,
Described locating information analysis unit calculates the threshold value of regulation according to the evaluated error of the evaluated error of described cell/section location and described mixed positioning, and the threshold value that will stipulate and described distance compare, under the threshold value little situation of described distance, select the cell/section location than regulation.
4. portable terminal, it receives the signal from gps satellite, and communicates with the base station, it is characterized in that,
Possess:
The locating information analysis unit, it selects to use a certain locate mode in cell/section location or the mixed positioning according to the distance between described base station and the described portable terminal; With
Position detection part, it uses the locate mode of being selected by described locating information analysis unit, the position of calculating described portable terminal.
5. the locate mode that location mode selection method, this method use when being chosen in the position that receives the portable terminal that communicates from the signal of gps satellite and with the base station being estimated is characterized in that,
Comprise the steps:
According to the distance between described base station and the described portable terminal, select to use a certain locate mode in cell/section location or the mixed positioning; With
The locate mode that use is selected by described locating information analysis unit, the position of calculating described portable terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101085204A CN101316439B (en) | 2007-05-31 | 2007-05-31 | Server device, mobile terminal and location mode selection method |
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| CN2007101085204A CN101316439B (en) | 2007-05-31 | 2007-05-31 | Server device, mobile terminal and location mode selection method |
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| CN101316439A true CN101316439A (en) | 2008-12-03 |
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| CN102192745A (en) * | 2010-02-24 | 2011-09-21 | 歌乐株式会社 | Position estimation device and position estimation method |
| CN102333351A (en) * | 2011-06-27 | 2012-01-25 | 北京邮电大学 | Positioning technology switching method and mobile device |
| CN102638875A (en) * | 2012-03-30 | 2012-08-15 | 深圳市易通无限科技有限公司 | Power-saving wireless positioning method, device and system for mobile terminal |
| CN102821461A (en) * | 2011-06-07 | 2012-12-12 | 深圳市嘀咕网科技有限公司 | Method and system for position judgment and corresponding mobile terminals |
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