CN100407352C - Dynamic and static sensor, mobile terminal and method for positioning mobile terminal - Google Patents

Abstract

The present invention relates to a dynamic and static sensor, a mobile terminal provided with the dynamic and static sensor and a method for positioning the mobile terminal. A mercury ball is sealed in an elongated glass pipe, two conducting wires are led out of one end of the elongated glass pipe, and thus, the dynamic and static sensor is made. The dynamic and static sensors are respectively arranged in the mobile terminal or an outer shell in three directions; the switching-on and switching-off states of the two conducting wires of each dynamic and static sensor are set, and the combination of the states of all the dynamic and static sensors is set; the mobile terminal reports the state combination of all the dynamic and static sensors to a radio access network controller RNC or a core network CN periodically or at definite time; after the radio access network controller RNC or the core network CN combines signal intensity measurements reported by the mobile terminal, the current position of the mobile terminal is computed. The dynamic and static state of the current terminal is reported to the radio network side through the mobile terminal; after the radio network side combines the signal intensity measurements reported by the mobile terminal, the current position of the mobile terminal can be exactly computed.

Description

Portable terminal and the method that portable terminal is located

Technical field

The present invention relates to location to the mobile terminal device of wireless telecommunication system.

Background technology

In the existing technology that portable terminal is positioned, the location technology of cell ID CELL ID is a most basic a kind of localization method, is applicable to all cellular networks.It does not need portable terminal (mobile phone) that any location measurement information is provided, also need not change existing network, only need increase simple positioning flow processing and get final product at network side, thereby the easiest realization, present this location technology is extensive use of in each mobile network.Its positioning principle is very simple: the position of the serving BS that network based portable terminal (mobile phone) is current and sub-district cover localisation of mobile terminals (mobile phone).If the sub-district is an omni cell, then the position of portable terminal (mobile phone) is to be the center with the serving BS, and radius is a circle of coverage radius of cell interior (when not adopting angle of arrival AOA (Angle of arive) to measure); If the sector is divided in the sub-district, can determine further that then portable terminal (mobile phone) is in the scope of certain sector covering.The precision of this localization method depends on the size of portable terminal (mobile phone) sub-district of living in fully, kilometer does not wait from hundreds of rice to tens.In the rural area, the coverage of sub-district is very big, so the positioning accuracy of CELL-ID is very poor.And the cell coverage area of urban area circumstance is less, and general radius of society for the city of prosperity, might adopt microcellulor at 1 ~ 2km, and radius of society may arrive hundreds of rice, and the positioning accuracy of CELL-ID is with the corresponding hundreds of rice that rises at this moment.The positional accuracy measurement that how to improve portable terminal (mobile phone) is the problem of the required solution of positioning service of existing GSM and UMTS.

Observing arrival time difference OTDOA (Observed Time Difference Of Arrival) or enhancement mode observed time difference E-OTD (Enhanced Observed Time Difference) is to utilize portable terminal (mobile phone) to measure the down-bound pilot frequency signal of different base station, obtain TOA (the Time of Arrival of different base station descending pilot frequency, due in), promptly so-called pilot phase is measured.According to this measurement result and in conjunction with the coordinate of base station, adopt suitable location-estimation algorithm, just can calculate the position of portable terminal (mobile phone).As Fig. 1, suppose that with a base station be reference, the pilot phase measurement result that provides according to portable terminal (mobile phone), it is poor with respect to the down-bound pilot frequency signal time of reception of a base station to access the b base station, be designated as TDOAab, multiply by the light velocity and just can access a base station and b base station to reach the propagation distance of portable terminal (mobile phone) poor, thereby can be that benchmark obtains hyperboloid with a base station and b base station.Equally, can access with a base station and c base station according to TDOAac is another hyperboloid of benchmark.Two bi-curved boundaries are exactly the position of portable terminal (mobile phone).Actual location-estimation algorithm need be considered the situation of location, many base stations (more than 3 or 3), so algorithm wants complicated a lot.Generally speaking, the number of base stations that portable terminal (mobile phone) is measured is many more, and certainty of measurement is high more, and positioning performance improves obvious more.

Above relatively two kinds of location technologies, the precision of GPS is the highest, but terminal must be supported.A-GPS (AssistedGlobal Positioning Systems) is the abbreviation of the GPS location of network assistance, and this method needs network and portable terminal (mobile phone) can both receive GPS information.Its basic principle is: network provides assistant GPS information to portable terminal (mobile phone), (for example GPS catches supplementary to comprise the supplementary of GPS pseudo range measurement, the GPS positioning auxiliary information, GPS sensitivity supplementary, gps satellite working condition information etc.) and the supplementary of portable terminal (mobile phone) position calculation (GPS almanac and revise data for example, the GPS ephemeris, gps navigation message etc.), utilize these information, portable terminal (mobile phone) can be very fast catch satellite, and receive metrical information, then metrical information is sent to the positioning service center in the network, calculate portable terminal (mobile phone) present located position by it.Because position calculation is finished at network, the GPS of portable terminal (mobile phone) receives implementation complexity to be reduced greatly, and can reduce power consumption.In open environment, as outskirts of a town or rural area, multipath and to block be negligible, the positioning accuracy of A-GPS can reach about 10m even be more excellent; If portable terminal (mobile phone) is in urban area circumstance, do not have block and multipath not serious, positioning accuracy will be about 30 ~ 70m; If portable terminal (mobile phone) is in zone indoor or other multipaths and serious shielding, portable terminal this moment (mobile phone) enough satellite-signals that defies capture, A-GPS can't finish the location, and this is its major limitation.

Getting rid of under the situation about disturbing, the path fading in any place is the path that depends on tree, although the influence of shade and small scale decline is arranged, the decline process is the process of dispersing.What we need determine is to isolate the large scale decline in institute is lossy, decline determines which part path loss is to belong to the decline that is caused by distance according to large scale, and which partly belongs to because the small scale decline that shade, Doppler, multipath or interference cause.If there is not bar to exist, utilize signal transmission time or position that the signal strength signal intensity that receives is calculated portable terminal (mobile phone) is very intuitively.When utilizing the transmission time, the transmission time that the light velocity multiply by the signal point-to-point transmission can draw distance, and the distance of point-to-point transmission can accurately obtain by the decay of signal in desirable free space.Yet in building, this direct path seldom exists, and may have a plurality of non-directapaths between transmitting and receiving a little, so signal degrade condition is unknown.Though the influence that can utilize some technology to alleviate multipath effect can't be eliminated fully, and its error is also unpredictable.Multipath effect also has certain influence to the signal time method, but not as big to the influence of signal strength signal intensity method.Signal strength signal intensity is to the decay of antenna direction and barrier, and other condition, and is also very responsive.By contrast, signal transmission time and antenna direction are irrelevant, and be less sensitive to decaying.Obviously, in open smooth rural area, be not less than positional accuracy measurement based on signal transmission time based on the positional accuracy measurement of path loss.

Because moving of terminal, to the measurement of signal strength signal intensity, measuring in the different time periods can the different measurement result of generation.So it is very necessary at static or mobile state understanding portable terminal (mobile phone) more exactly current.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of portable terminal to reach the method that portable terminal is located, and this portable terminal can report portable terminal sound state, and realizes portable terminal is positioned.

Portable terminal among the present invention is to be placed with at least one described dynamic and static sensor of claim 1 by orthogonal three-dimensional each dimension in existing portable terminal or on its shell; Described dynamic and static sensor comprises: elongated glass tube, in glass tube, be sealed with mercury ball, and draw two leads at an end of this glass tube.

The method that reports mobile terminal state among the present invention may further comprise the steps:

Place dynamic and static sensor respectively on three directions in portable terminal or on the shell, described dynamic and static sensor comprises: elongated glass tube, in glass tube, be sealed with mercury ball, and draw two leads at an end of this glass tube;

If the state that two leads of each dynamic and static sensor switch on and off; And set the combination of all dynamic and static sensor states;

Mobile terminal period or timing report radio access network controller RNC or core net CN with the combinations of states situation of all dynamic and static sensors;

Behind radio access network controller RNC or the signal strength measurement of core net CN, calculate the current position of portable terminal in conjunction with mobile terminal reporting.

The present invention informs by portable terminal the sound state of the current terminal of wireless network side behind the signal strength measurement of wireless network side in conjunction with mobile terminal reporting, can calculate the current position of portable terminal more accurately.

Description of drawings

Fig. 1 is the locate mode schematic diagram;

Fig. 2 is single sensor construction schematic diagram;

Fig. 3 places the transducer schematic diagram at two dimensional surface;

Fig. 4 places the transducer schematic diagram at three dimensions;

Fig. 5 is a flow chart of the present invention.

Embodiment

Any motion all is 3 dimensions, and motion is absolute, and static is relative.Two one-way movement transducers of vertical placement just can detect the motion on the both direction in this plane in a plane, uniform motion and rectilinear motion are special cases in the present invention, if portable terminal, mobile phone for example, in certain plane, move in a circle in the rectilinear motion or the face of leveling off, can't detect mobile phone, because this phenomenon can take place hardly, it only can be realized in the laboratory.The motion of any occurring in nature all is 3 dimensions, detects simultaneously on 3 dimensions and just can judge static and motion.

Below in conjunction with accompanying drawing enforcement of the present invention is introduced.

1, an end of elongated glass tube is drawn two leads, seal behind the placement mercury ball in the glass tube, when mercury ball moves to the conductor wire end of glass tube, two lead conductings, when mercury ball left the glass tube conductor wire end, two leads disconnected, constitute the motion sensor in an orientation, as Fig. 2.Fig. 3 has drawn in the situation of two dimensional surface both direction rotating dynamic and static transducer.Fig. 4 has drawn and placed a plurality of dynamic and static sensor situations respectively on three-dimensional three plane perpendicular to each other.On portable terminal, place dynamic and static sensor and can be placed on the mobile terminal case outside, also can place in the mobile terminal case.

2, definition lead conducting state is 0, and the lead off-state is 1.Determine the combinations of states of current time transducer, for example have 6 transducers on 3 planes, the state dimension 101101 of each transducer, equal 45 of 10 systems, in next detection time unit, the state of each transducer still is 45, illustrates that portable terminal is static, be not equal to any number of 45, illustrate that portable terminal is in motion state.

3, increase a kind of measurement at mobile terminal side, i.e. static the or motion state measurement of portable terminal.The result that portable terminal will be measured adopts periodic report or Time Triggered to report; Base station control subsystem NodeB is mutual relaying transparent transmission between RNC side and mobile terminal side only, triggers flow process more than adopting when needs mobile terminal reporting sound state and power measurement.Can be on adding on the existing 3GPP agreement this measurement type.

4, by sound measurement result, add signal strength measurement, carry out the location of portable terminal portable terminal to portable terminal.

Measure by portable terminal being carried out sound, measurement result is binary system amount β=0,1, supposes the received power P that portable terminal records for the first time _R1=P _R1a+ Δ P _e, the received power P that records for the second time _R2=P _R2a+ Δ P _e, P _R1aBe the actual power value of measuring for the first time, P _R2aBe the actual power value of measuring for the second time.Δ P _eBe the measure error that different portable terminals is brought into, think that here 2 measure errors of same portable terminal are identical.For the first time with secondary difference power P _R1-P _R2=P _R1a-P _R2a, eliminated the measure error of different mobile terminal.NodeB is transmitting power P for the first time _T1, transmitting power P for the second time _T2, transmitting power loss first time α ₁* P _T1, transmitting power loss second time α ₂* P _T2, eliminate the transmitting power sum of errors received power error of different NodeB and portable terminal (mobile phone), draw equation:

P _t1-P _t2＝α ₁×P _t1+P _r1a-(α ₂×P _t2+P _r2a)

According to the change in location (just introducing sound state β=0,1) of portable terminal, according to electromagnetic wave propagation theory, propagation loss is only relevant with the path, draws power path fissipation factor α=α ₁=α ₂, α=(α ₁+ α ₂) ÷ 2+ β * (α ₁-α ₂), derive:

P _t1-P _t2＝α×(P _t1-P _t2)+P _r1a-P _r2a

Because P _R1a-P _R2a=P _R1-P _R2Known for the portable terminal measurement, draw:

$\mathrm{\α}=\frac{(P_{t1}-P_{t2})-(P_{r1}-P_{r2})}{P_{t1}-P_{t2}}$

Path loss $\mathrm{PL}\left(\mathrm{dB}\right)=10\log \frac{P_t}{P_r}=10\log \frac{1}{\mathrm{\α}}=-10\log \mathrm{\α}$

Under the situation of antenna far field, the free space propagation model:

$\mathrm{PL}\left(\mathrm{dB}\right)=10\log \frac{P_t}{P_r}=-10\log \left[\frac{G_t{G}_r{\mathrm{\λ}}^2}{{\left(4\mathrm{\π}\right)}^2{d}^2}\right],$ G wherein _tBe the gain of transmitting antenna, G _rBe the gain of reception antenna, λ is the wavelength of carrier frequency.It all is the datum of sub-district.Draw: $\mathrm{\α}=\frac{G_t{G}_r{\mathrm{\λ}}^2}{{\left(4\mathrm{\π}\right)}^2{d}^2}$ Ideal situation.Need under the actual conditions to determine be radius of society greater than the T-R distance under the 11.25 axiom situations, be modified to bilinear model $d=\sqrt[4]{\frac{G_t{G}_r{h}_t^2{h}_r^2{\mathrm{\λ}}^2}{{\left(4\mathrm{\π}\right)}^2\mathrm{\α}}},$ h _tBe the height (30m-200m) of transmitting antenna, h _rBe the reception height (1m-3m) of portable terminal, d is the position of portable terminal on radius of society.

When in the city, should adopt the Okumura model, preferably in the broadcast of agreement, add the geographical feature information of some sub-districts.

Claims (2)

1. a portable terminal is characterized in that, is placed with at least one dynamic and static sensor by orthogonal three-dimensional each dimension in described terminal or on its shell; Described dynamic and static sensor comprises: elongated glass tube, in glass tube, be sealed with mercury ball, and draw two leads at an end of this glass tube.

2. method to portable terminal location may further comprise the steps:

Place dynamic and static sensor respectively on three directions in portable terminal or on the shell, described dynamic and static sensor comprises: elongated glass tube, in glass tube, be sealed with mercury ball, and draw two leads at an end of this glass tube;

Set the state that two leads of dynamic and static sensor switch on and off, and set the combination of all dynamic and static sensor states;

Mobile terminal period or timing report radio access network controller RNC or core net CN with the state of each dynamic and static sensor;

Behind radio access network controller RNC or the signal strength measurement of core net CN, calculate the current position of portable terminal in conjunction with mobile terminal reporting.

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