EP4073534A1 - Procede de geolocalisation d'un equipement utilisateur recevant une pluralite de faisceaux radiofrequences emis par une station de base d'un reseau de radiocommunications, produit programme d'ordinateur et dispositif correspondants - Google Patents
Procede de geolocalisation d'un equipement utilisateur recevant une pluralite de faisceaux radiofrequences emis par une station de base d'un reseau de radiocommunications, produit programme d'ordinateur et dispositif correspondantsInfo
- Publication number
- EP4073534A1 EP4073534A1 EP20842012.5A EP20842012A EP4073534A1 EP 4073534 A1 EP4073534 A1 EP 4073534A1 EP 20842012 A EP20842012 A EP 20842012A EP 4073534 A1 EP4073534 A1 EP 4073534A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiofrequency
- user equipment
- relative power
- power information
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/16—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived sequentially from receiving antennas or antenna systems having differently-oriented directivity characteristics or from an antenna system having periodically-varied orientation of directivity characteristic
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
- G01S3/28—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics
-
- 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
- G01S5/0252—Radio frequency fingerprinting
- G01S5/02521—Radio frequency fingerprinting using a radio-map
Definitions
- TITLE Method for geolocation of user equipment receiving a plurality of radiofrequency beams emitted by a base station of a radiocommunications network, corresponding computer program product and device.
- the field of the invention is that of the implementation of radiocommunications networks.
- the invention relates more particularly to the geolocation of user equipment - receiving signals transmitted by such radio communication networks.
- the invention has many applications, in particular, but not exclusively, in the field of radiocommunications networks conforming to 3GPP (“3rd Generation Partnership Project”) standards of latest generations or of future generations.
- 3GPP 3rd Generation Partnership Project
- GPS system for "Global Positioning System” in English
- GPS system relies on signals broadcast by satellites orbiting the Earth. Satellite signals are received by the GPS system and used to estimate the position of the satellites and the distance between the satellites and a GPS receiver.
- the accuracy of the estimate provided by the GPS system depends on the number of satellites visible by the GPS system, which can vary greatly depending on weather conditions.
- GPS receivers are resource-intensive, particularly in terms of energy, which can prove to be problematic when they are installed in equipment having limited resources, such as, for example, mobile equipment operating on battery.
- an item of equipment connected to a cellular type radiocommunications network such as for example a GSM network (for "Global System Mobile” in English)
- a cellular type radiocommunications network such as for example a GSM network (for "Global System Mobile” in English)
- GSM Global System Mobile
- Cell ID Cell ID
- the geographical position of the equipment is thus estimated approximately from the geographical coordinates of the base station via which the equipment is attached to the network.
- different methods based on the triangulation or the estimation of the time of flight of the radio signals can be implemented. However, such methods require having the user equipment within range of different base stations of the network under consideration.
- a method for geolocation of a user equipment item receiving a plurality of radiofrequency beams transmitted by a base station of a radiocommunications network comprises: obtaining a power measured by the user equipment for each radiofrequency beam of the plurality of radiofrequency beams delivering a corresponding set of measured powers; a calculation of at least one item of information, called relative power information, representative of a ratio or of a difference between two powers of the set of measured powers associated with two corresponding radiofrequency beams; and a determination of a position of the user equipment from, on the one hand, said at least one relative power item of information and, on the other hand, for each relative power item of information and for each radiofrequency beam associated with the item of information relative power, of an antenna radiation pattern model characterizing the power, as a function of a direction of observation, of the radiofrequency beam associated with the relative power information.
- the invention proposes a new and inventive solution for geolocating user equipment within the range of a base station (eg connected to the base station) of a radiocommunications network (eg a radiocommunications network conforming to 3GPP standards. ). More particularly, the position of the user equipment is determined from power measurements of different signals transmitted from a single base station (eg signals transmitted via different sectorial antennas of the base station, or signals corresponding to different beams an antenna of the array type of radiating elements fitted to the base station). In this way, it is not necessary for the user equipment to be within the reach of different base stations, thereby making the technique described simple to implement. Furthermore, the position of the user equipment is determined from information of relative powers.
- Such information is representative of a ratio (when the powers are expressed in natural units) or of a difference (when the powers are expressed in logarithmic units) between the two powers of two given radiofrequency beams.
- the effects of propagation attenuation or "Path Loss” in English
- rapid fading of the propagation channel or “Fast Fading” in English
- occultation or mask effects or “Shadowing” in English
- this type of phenomenon impacts in the same way the two radiofrequency beams considered, these beams being emitted by radiating elements located at the same base station.
- the calculation of a relative power thus makes it possible to cancel the effects of these phenomena on the signals received by the user equipment.
- the determination implements, for at least one relative power information given among the relative power information (s), the resolution of an equation whose members are a function, on the one hand, of the power information. relative data and, on the other hand, of an expected value of the given relative power information function, for each radiofrequency beam associated with the given relative power information, of the radiation pattern model characterizing the power, as a function of a direction of observation of the radiofrequency beam associated with the given relative power information.
- the position of the user equipment is determined in a simple and robust manner by matching the measured relative power information (s) with the expected value (s) as predicted by the radiation pattern models.
- obtaining comprises obtaining a first and a second measured power corresponding respectively to a first radiofrequency beam emitted by a first sectorial antenna of the base station and to a second radiofrequency beam emitted by a second sectorial antenna of the base station.
- the calculation delivers a first relative power information associated with said first and second radiofrequency beams.
- the determination comprises the determination of an angle representative of a longitude of the user equipment in a frame of reference centered on said first and second sectorial antennas from, on the one hand, the first relative power information and, on the other hand , of an antenna radiation pattern model characterizing the power, as a function of a direction of observation, of the first and second radiofrequency beams.
- the angle representative of the longitude of the user equipment is determined in a simple and robust manner in the case of a base station implementing a technology of the SISO type (for “Single Input Single Output” in English) on different sectors. cover.
- obtaining further comprises obtaining a third measured power of a third radiofrequency beam radiated by a third sectorial antenna of said base station.
- the computation delivers other relative power information associated with the third radiofrequency beam and with a beam among the first and second radiofrequency beams.
- the sign of the other relative power information expressed in decibels is representative of the sign of the angle ⁇ 1 of the user equipment in the frame.
- the first and second radiofrequency beams are radiated by the first and second antennas at a first angle of inclination (also commonly referred to as “tilt” in English).
- Obtaining comprises obtaining a fourth measured power corresponding to a fourth radiofrequency beam radiated by the first antenna according to a second angle of inclination or by the second antenna according to the second angle of inclination.
- the calculation delivers second relative power information associated with the fourth radiofrequency beam and with the first, respectively second, radiofrequency beam.
- the determination comprises the determination of an angle representative of a latitude of the user equipment in the frame of reference from, on the one hand, the second relative power information and, on the other hand, a model of the diagram of antenna radiation characterizing the power, as a function of a direction of observation, of the fourth and first, respectively second, radiofrequency beams.
- the angle ⁇ 1 representative of a longitude and the angle ⁇ 1 representative of a latitude of the user equipment are determined simply and precisely from the beams emitted by the two antennas of the base station when they emit radiofrequency beams at two different angles of inclination.
- M12 dB represents the second relative power information expressed in decibels
- ⁇ 3 dB represents the opening angle at three decibels of the radiation pattern of each of the first and second antennas in a plane defining the angle ⁇ 1
- ⁇ t1 represents the first angle of inclination
- ⁇ t2 represents the second angle of inclination.
- the angle representative of a latitude of the user equipment is determined in a simple and robust manner in the case of a base station implementing a technology of the SISO type (for “Single Input Single Output” in English) on different coverage sectors.
- determining comprises determining from the angle representative of the latitude of the user equipment a distance of the user equipment from the base station.
- the distance of the user equipment from the base station is determined in a simple and robust manner.
- the longitude and latitude of the user equipment in the frame centered on the antennas of the base station, and the distance of the user equipment from the base station, a precise location is obtained. user equipment.
- each radio frequency beam of the plurality of radio frequency beams is radiated by an array of radiating elements of the base station.
- the resolution may include the implementation of a method for numerically solving said at least one equation.
- the method applies in the case of a base station implementing a technology of the MIMO type (for “Multiple-input Multiple-Output” in English).
- each radiofrequency beam of the plurality of radiofrequency beams is radiated by the same array of radiating elements of the base station.
- the resolution implements for said at least one given relative power information item: obtaining the expected value of the given relative power information for a set of observation directions delivering a set of expected values each corresponding to a viewing direction ; a comparison between, on the one hand, the given relative power information and, on the other hand, each expected value of the set of expected values delivering a probable direction of observation.
- the position of the user equipment is a function of the likely direction of radiation.
- the likely observation direction corresponds to an expected value closest to the given relative power among the expected values of the set of expected values.
- the antenna radiation pattern model characterizing the power A A, Beami ( ⁇ , ⁇ ) of an i-th radiofrequency beam as a function of a viewing direction considered is expressed as a function from: where: - ⁇ represents an angle representative of a longitude of the direction of observation considered, ⁇ represents an angle representative of a latitude of the direction of observation considered, ⁇ i, etilt represents an angle representative of a longitude of the desired direction of propagation for said i-th radiofrequency beam, ⁇ i, escan represents an angle representative of a latitude of the direction of propagation desired for said i-th radiofrequency beam,
- N H represents the number of radiating elements of said array of radiating elements in a horizontal direction
- - N V represents the number of radiating elements of said array of radiating elements in a vertical direction
- d V represents the vertical spacing between two radiating elements
- dH represents the horizontal spacing between two radiating elements
- l represents the wavelength of the radiofrequency beam
- a E ( ⁇ , ⁇ ) represents the radiation pattern of each radiating element of said array of radiating elements.
- obtaining comprises receiving, by the base station, the power measured by the user equipment for each RF beam of the plurality of RF beams.
- the technique described is implemented on the side of the radiocommunications network, e.g. at the level of a device in the base station.
- the invention also relates to a computer program comprising program code instructions for implementing the geolocation method described above (according to any one of the various aforementioned embodiments), when it is executed on a computer.
- a geolocation device comprising a reprogrammable computing machine or a dedicated computing machine, configured to implement the steps of the geolocation method described above (according to the any of the above embodiments).
- a base station comprising a geolocation device as described above (according to any one of the aforementioned embodiments).
- FIG. 1a represents user equipment connected to a base station of a radiocommunications network according to one embodiment of the invention
- FIG. 1b represents the three sectors covered by the three sectoral antennas of the base station of FIG. 1a;
- FIG. 2a represents a network of radiating elements which can equip the base station of FIGS. 1a and fig. 1b according to one embodiment of the invention
- FIG. 2b details the radiating elements of the network of FIG. 2a;
- FIG. 3 represents the steps of the geolocation method according to one embodiment of the invention.
- FIG. 4 shows an example of a device structure allowing the implementation of the steps of the geolocation method of FIG. 3 according to one embodiment of the invention.
- the general principle of the invention is based on the calculation of one or more information, called relative power information, each representative of a ratio (when the powers are expressed in natural units) or of a difference (when the powers are expressed. in logarithmic unit) between the two powers of two radiofrequency beams received by a user equipment.
- the beams in question are transmitted by the same base station of a radiocommunications network. They are thus impacted in the same way by phenomena of the propagation attenuation type, rapid fading of the propagation channel, and masking effects (also referred to in English as “shadowing”).
- the calculation of a relative power from the two powers measured by the user equipment makes it possible to cancel the effects of these physical phenomena linked to radio propagation.
- the determination of the position of the user equipment from the relative power information (s) is based, for each beam received by the user equipment, on a model of the radiation pattern of the radiating elements of the station. base that emitted the beam in question. This makes it possible to go back in a simple and robust manner from the relative power information (s) to the position of the user equipment.
- FIGS. 1a and fig. 1b a user equipment UE receiving the radiofrequency beams transmitted by a base station BS of a radiocommunications network according to one embodiment of the invention.
- the user equipment UE is connected to the base station BS.
- the user equipment UE is not connected to the base station BS, for example when it itself implements the geolocation method according to the invention. In this case, the user equipment UE does not need to send back to the base station BS the power measurements that it performs.
- the radio communications network is a cellular network, such as for example a 2G, 3G, 4G or 5G network defined by the 3GPP standard or another standard.
- a base station is defined as being dedicated to the management of a given geographical site (for example a geographical site corresponds to a cell of the network).
- the base station BS manages the corresponding geographical site in a multisectoral (or multi-sector) manner. More particularly, the base station BS covers the site via three distinct sectors, each sector being covered by a corresponding so-called sectorial antenna A1, A2 or A3.
- sectorial antenna is understood to mean an antenna emitting mainly in a given direction.
- a cell of the radiocommunications network comprises three sectors. The 3 sectors are assumed here of identical dimensions.
- Each sector is covered by means of a single antenna A1, A2 or A3 capable of transmitting according to a single beam (or at least a single main beam concentrating the major part of the power radiated by the antenna) on a frequency band given.
- the directions of the beams emitted by the antennas A1, A2 or A3 covering two adjacent sectors of this site have between them an angle equal to ⁇ d.
- Each antenna A1, A2, A3 is characterized, in a manner known per se, by a radiation pattern. For example, we consider antennas as described in the document Report ITU-R M.2135-1 of the ITU-R, entitled “Guidelines for evaluation of radio technologies for IMTAdvanced” of December 2009.
- the radiation pattern of each antenna A1, A2, A3 has an opening angle of three decibels in the horizontal plane noted ⁇
- the antennas A1, A2 and A3 are collocated in the center of the cell covered by the base station BS. It is noted that the term “collocated” is understood to mean that the antennas A1, A2 and A3 are located at the same site. However, they are not necessarily positioned at the same geographical point and can be separated by a few centimeters or a few tens of centimeters, or even a few meters. For example, the antennas are spaced apart by a distance less than ⁇ / 2 where l denotes the wavelength of the signals transmitted by the antennas A1, A2 and A3 to communicate on the network. As a variant, they can be spaced apart by a distance greater than ⁇ / 2.
- the user equipment UE is identified with respect to the base station BS in a reference Oxyz centered on the antennas A1, A2 and A3 of the base station BS.
- the origin of the coordinate system is located here at the top of the pylon supporting the antennas A1, A2 and A3, for example at the level of the barycenter of the antennas A1, A2 and A3.
- the Oz axis is vertical and the Ox and Oy axes define a horizontal plane parallel to the ground.
- the user equipment UE is identified via angles of a spherical coordinate system ( ⁇ 1, ⁇ 1) in the frame in question, and by the distance r1 representing the projection on the ground of the distance from the user equipment UE with respect to the origin 0 of the reference.
- r1 represents the distance of the user equipment UE from the foot of the pylon supporting the antennas A1, A2 and A3, and ⁇ 1 and ⁇ 1 respectively representing the longitude and latitude of the user equipment UE in the Oxyz benchmark.
- the angle ⁇ 1 is thus defined via the projection of the vector joining the origin of the Oxyz coordinate system to the user equipment UE in a horizontal plane, eg the O'x'y 'plane parallel to the Oxy plane but located at ground level.
- the coordinates (r1, ⁇ 1, ⁇ 1) define the relative position of the user equipment UE with respect to the base station BS (or more precisely in the reference frame associated with the base station BS). To have the absolute position of the user equipment UE, it is thus necessary to take into account the position of the origin of the reference mark in addition to the relative position defined by the coordinates (r1, ⁇
- the antennas A1, A2 and A3, and therefore the origin of the reference frame defined above also, are located at a height Hant from the ground. Moreover, the antennas A1, A2 and A3 emit radiofrequency beams at an inclination angle ⁇ t (or “tilt” angle) corresponding to a tilt angle (a tilt latitude here) of their radiation pattern with respect to the horizontal plane Oxy.
- Such sectoral antennas A1, A2 and A3 are for example suitable for a so-called SISO (for “Single Input Single Output”) implementation of the radio communications network in question.
- SISO Single Input Single Output
- an antenna comprising an array 200 of radiating elements 200er, for example of the electronic scanning type, which can equip the base station BS according to another embodiment of the invention.
- the origin of the Oxyz coordinate system is located at the level of the center of the network 200.
- the respective centers of two consecutive radiating elements 200er are spaced apart by a distance d V in the vertical direction, and by a distance d H in the horizontal direction.
- the pitch of the grating 200 is dv in the vertical direction and d H in the horizontal direction.
- other numbers N H and N V of radiating elements 200er are considered.
- such a network 200 is capable of emitting different radiofrequency beams each pointing in a desired direction of propagation. More particularly, weighting laws (in amplitude and / or in phase) of each radiating element 200er must be implemented. Examples of such laws are given below in relation to the description of FIG. 3. Consider for example a network 200 of radiating elements 200er as specified in document 3GPP TR 37.842 V.13.2.0.
- Such a network 200 is for example suitable for a so-called MIMO (for “Multiple-input Multiple-Output”) implementation of the radio communications network considered.
- MIMO Multiple-input Multiple-Output
- the power of a plurality of radiofrequency beams transmitted by the base station BS is obtained. More particularly, such a power is measured by the user equipment UE. In this way, a corresponding set of measured powers is got.
- the radiofrequency beams of which the user equipment UE measures the power are not necessarily radiofrequency beams which have been transmitted by the base station BS to the user equipment. Indeed, by way of illustration, in the SISO configuration shown in FIGS. 1a and fig. 1b, the user equipment UE, due to its position where appropriate in one of the sectors covered by the base station BS, receives the radiofrequency beams emitted by the antenna of the base station BS covering this sector.
- radiofrequency beams emitted by another antenna of the base station BS covering a sector adjacent to that in which it is located.
- several radiofrequency beams can be emitted simultaneously in several directions, which do not necessarily coincide with the direction in which the user equipment UE is located.
- the latter may however be able to receive these radiofrequency beams even if they are not directly intended for it.
- the invention thus applies to any radiofrequency beam emitted by an antenna of the base station as soon as the user equipment is capable of measuring the power of such a beam (and of distinguishing this power from a noise power. ).
- the user equipment UE identifies which antenna A1, A2 or A3 transmitted the beam for which it measures the power from information conveyed by the beam in question.
- the measured power is fed back to the radio communications network (eg via a transmission to the base station BS).
- the device 400 (detailed further below in relation to FIG. 4) implementing the present geolocation method is housed in the network itself (eg in a node of the network or in the BS base station).
- the base station BS receives the power measured by the user equipment UE for each RF beam of the plurality of RF beams.
- the present geolocation method is implemented directly in the user equipment UE.
- the device 400 is housed in the user equipment UE.
- At least one piece of relative power information representative of a ratio (when the powers are expressed in natural units) or of a difference (when the powers are expressed in logarithmic units) between two powers of the set of measured powers associated with two corresponding radiofrequency beams is calculated.
- the powers measured by the user equipment UE can be averaged over a determined period. For example, they are collected at an acquisition frequency determined (for example every milliseconds) and are averaged by the user equipment UE over a determined period. The duration of this period can be determined as a function of various parameters, such as for example the possible mobility of the user equipment UE and, if appropriate, its speed, etc. This average can be obtained using a sliding window of length equal to the determined period envisaged.
- the inventor has determined that for a frequency of 1 GHz, an average carried out over a period of 50 ms of measurements acquired every milliseconds is sufficient for many antennas conventionally used to obtain an accurate estimate of the position of the user equipment.
- This average makes it possible to be freed from the phenomena of rapid variations (or "fast-fading" in English) of the propagation channels which may differ slightly from one antenna to another when they are separated by a few centimeters or a few tens. centimeters in particular.
- the position of the user equipment UE is determined from, on the one hand, said at least one relative power information item and, on the other hand, for each relative power information item and for each radiofrequency beam associated with the relative power information (ie for each of the two radiofrequency beams whose power is the basis of the relative power information in question), of an antenna radiation pattern model characterizing the power, in function of a direction of observation, of the radiofrequency beam associated with the relative power information.
- the device 400 obtains for example a first Pll (UE) and a second P21 (UE) measured powers corresponding respectively to a first radiofrequency beam emitted by the antenna A1 and to a second beam radio frequency emitted by antenna A2. Indeed, even when the user equipment UE is located in a given sector, it receives powers from the various antennas A1, A2, A3 of the base station covering the site.
- UE Pll
- UE P21
- the first A1 and second A2 antennas emit radiofrequency beams at the same angle of inclination ⁇ t1 (ie the same latitude) with respect to the horizontal plane Oxy.
- the first power Pll (UE) measured at the level of the user equipment UE is generally expressed according to the expression:
- P11 (UE) K.P0.r -eta .G11 ( ⁇ 1, ⁇ 1) .X BS (UE) .Y BS (UE) (Eq. 1)
- K is a constant
- r denotes the distance separating the equipment user UE of antenna A1
- eta is a fading factor (also called “pathloss” factor) modeling the propagation attenuation
- P0 is the power emitted by antenna A1 on the beam considered
- G11 ( ⁇ 1, ⁇ 1) is the gain of the antenna A1 radiated on the beam considered in the direction ( ⁇ 1, ⁇ 1)
- X BS (UE) is a parameter representing the fast fading of the propagation channel between the antenna A1 and the user equipment UE
- Y BS (UE) is a parameter representing the mask effects (or “shadowing”) of the propagation channel between the antenna A1 and the user equipment UE.
- Such a model is known per se and is not described in more detail here.
- the second power P21 (UE) measured at the level of the user equipment UE is generally expressed according to the expression:
- P21 (UE) K.P0.r -eta .G21 ( ⁇ 2, ⁇ 2) .X BS (UE) .Y BS (UE) (Eq. 2)
- G21 ( ⁇ 2, ⁇ 2) is the gain of the antenna A2 radiated on the beam considered in the direction of the user equipment UE.
- the first relative power information Mil associated with the first and second radiofrequency beams is expressed only as a function of the gains G11 ( ⁇ 1, ⁇ 1) and G21 ( ⁇ 1, ⁇ 1) . Indeed, from the equations (Eq. 1) and (Eq. 2), we can write:
- M11 dB (G11 ( ⁇ 1, ⁇ 1) - G21 ( ⁇ 1, ⁇ 1)) dB (Eq. 3dB) It is noted that when the transmission powers of the antennas A1, A2 and A3 are different, the same equations can be obtained up to a constant (multiplicative or additive). This constant characterizes the ratio (linearly) or the difference (in dB) between the two transmission powers of the antennas considered.
- step E320 having knowledge of a model (eg analytical or obtained by measuring the antenna in question) of antenna radiation diagram characterizing the power, as a function of a direction of observation, of the radiofrequency beam considered (here a model for G11 ( ⁇ 1, ⁇ 1) and for G21 ( ⁇ 1, ⁇ 1)), it is possible to return all or part of the coordinates characterizing the position of the user equipment UE by solving the equation (Eq. 3lin) or the equation (Eq. 3dB) during the implementation of step E320.
- the determination of the position of the user equipment UE implements, for at least one given relative power information item, the resolution of an equation (equation (Eq. 3lin) or equation (Eq.
- the expected value in question is a function, for each radiofrequency beam associated with the given relative power information, of the radiation pattern model characterizing the power, as a function of a direction of observation, of the radiofrequency beam associated with the relative power information given.
- ⁇ 1 - (M11 dB / 24) ⁇ 2 3dB / ⁇ d + ⁇ d / 2 (Eq. 7)
- the angle ⁇ 1 is determined from, on the one hand, the first relative power information item Mil (expressed in logarithmic units in equation (Eq. 7)) and , on the other hand, of the radiation diagram model characterizing the power, as a function of a direction of observation, of the first and second radiofrequency beams (here
- G11 ( ⁇ 1, ⁇ 1) and G21 ( ⁇ 1, ⁇ 1)).
- a third measured power P31 (UE) corresponding to a third radiofrequency beam emitted by the sectorial antenna A3 is advantageously obtained during step E300.
- the other relative power information corresponds to the P21 / P31 ratio when the powers are expressed in natural units, or to the difference P21dB - P31dB when the powers are expressed in decibels.
- the sign of the other relative power information expressed in decibels is representative of the sign of the angle ⁇ 1.
- the angle ⁇ 1 makes it possible to estimate the position of the user equipment UE in the cell considered, in particular under the assumption that the user equipment UE is on the ground. However, in certain cases it is advantageous to also determine the angle ⁇ 1 of the user equipment UE. To do this, during the implementation of step E300, the device 400 obtains a fourth measured power P12 (UE) corresponding to a fourth radiofrequency beam emitted by the sectorial antenna A1 at a second angle of inclination ⁇ t2, relative to the horizontal plane
- step E310 a second relative power information M12 associated with the fourth radiofrequency beam and with the aforementioned first radiofrequency beam is calculated.
- the angle ⁇ 1 locating the user equipment UE in the reference frame centered on the antennas A1, A2 and A3 of the base station BS is determined on the basis, on the one hand, of the second relative power information M12 and, on the other hand, of the radiation pattern model characterizing the power, as a function of a direction of observation, of the first and fourth radiofrequency beams.
- an identical expression for ⁇ 1 is obtained from the expression of the relative power information, expressed in decibels, equal to (G21 ( ⁇ 2, ⁇ 2) - G22 (02, ⁇ 2)) dB, where (G21 ( ⁇ 2 , ⁇ 2)) dB is given by the equation (Eq. 5) and where (G22 ( ⁇ 2, ⁇ 2)) dB corresponds to the gain of the antenna A2 in the direction (02, ⁇ 2) when the antenna A2 transmits according to an angle of inclination equal to ⁇ t2.
- the angle ⁇ 1 and the angle ⁇ 1 identifying the user equipment UE are determined in a simple and precise manner from the beams emitted by at least two of the antennas A1, A2, A3 of the base station BS according to at least two different tilt angles. From the knowledge of the angle ⁇ 1, it is also possible at step E320 to calculate a distance of the user equipment UE with respect to the base station BS. In the embodiment described here, for example, in step E320, the distance r1 corresponding to the projection on the ground of the distance of the user equipment UE with respect to the origin of the frame (Oxyz) is calculated.
- a model of the antenna radiation diagram A A, Beami ( ⁇ , ⁇ ) characterizing the power of an i-th radiofrequency beam emitted as a function of a direction of observation (Q, f) considered is for example specified in document 3GPP TR 37.842 V.13.2.0 (it is specified here that the notations used, ie Q and cp, in the present application for the angles representative of longitude and latitude in the MIMO case are reversed those used in document 3GPP TR 37.842 V.13.2.0.
- colatitude is equal to latitude plus ⁇ / 2) and is expressed as: and: where ⁇ i, etilt and ⁇ i, escan represent the longitude and the latitude defining the desired direction of propagation for the i-th radiofrequency beam respectively in the planes of definition of angles 01 and respectivement1, and AE ( ⁇ , perennial) represents the radiation diagram, in the Oxyz frame of reference, of each of the 200er radiating elements of the network 200 (assumed to be identical here).
- a power P200i (UE) measured by the user equipment UE and corresponding to the i-th radiofrequency beam emitted by the network 200 is generally expressed according to the expression:
- P200i (UE) K.P0.r -eta .A A, Beami ( ⁇ , ⁇ ) .X BS (UE) .Y BS (UE)
- the resolution of such an equation comprises the implementation of a digital resolution method.
- solving such an equation includes exploring the space of solutions (q, f) in order to determine the most likely direction ( ⁇ 1, ⁇ 1) of the user equipment UE.
- the resolution implements, for a given relative power information item calculated during the implementation of step E310: obtaining the expected value of the given relative power information for a set of different observation directions .
- a set of expected values each corresponding to a direction of observation is thus obtained; and a comparison between, on the one hand, the given relative power information and, on the other hand, each expected value of the set of expected values delivering a probable direction of observation.
- the probable observation direction corresponds to an expected value closest (eg in the sense of a given standard of the absolute value type) to the given relative power among the expected values of the set of expected values.
- the position of the user equipment is a function of the likely direction of radiation.
- the position of the user equipment is determined as the likely direction of radiation.
- FIG. 4 an example of a device structure 400 making it possible to implement the steps of the geolocation method of FIG. 3 according to one embodiment of the invention.
- the device 400 comprises a random access memory 403 (for example a RAM memory), a processing unit 402 equipped for example with a processor, and controlled by a computer program stored in a read only memory 401 (for example a ROM memory or a hard disc).
- a computer program stored in a read only memory 401 (for example a ROM memory or a hard disc).
- the code instructions of the computer program are for example loaded into the random access memory 403 before being executed by the processor of the processing unit 402.
- FIG. 4 illustrates only one particular way, among several possible, of making the device 400 so that it performs certain steps of the geolocation method (according to any one of the embodiments and / or variants described above in relation with fig. 3).
- a reprogrammable computing machine a PC computer, a DSP processor or a microcontroller
- a program comprising a sequence of instructions
- a dedicated computing machine by example a set of logic gates such as an FPGA or an ASIC, or any other hardware module.
- the corresponding program (that is to say the sequence of instructions) can be stored in a removable storage medium (such as for example a CD- ROM, DVD-ROM, USB key) or not, this storage medium being partially or totally readable by a computer or processor.
- device 400 is included in user equipment UE. In some embodiments, the device 400 is included in a device of the radio communications network, e.g. in a node of the network or in the base station BS.
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- Remote Sensing (AREA)
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Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1914092A FR3104266A1 (fr) | 2019-12-10 | 2019-12-10 | Procédé de géolocalisation d’un équipement utilisateur recevant une pluralité de faisceaux radiofréquences émis par une station de base d’un réseau de radiocommunications, produit programme d’ordinateur et dispositif correspondants. |
| PCT/FR2020/052341 WO2021116595A1 (fr) | 2019-12-10 | 2020-12-08 | Procede de geolocalisation d'un equipement utilisateur recevant une pluralite de faisceaux radiofrequences emis par une station de base d'un reseau de radiocommunications, produit programme d'ordinateur et dispositif correspondants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4073534A1 true EP4073534A1 (fr) | 2022-10-19 |
Family
ID=69811198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20842012.5A Pending EP4073534A1 (fr) | 2019-12-10 | 2020-12-08 | Procede de geolocalisation d'un equipement utilisateur recevant une pluralite de faisceaux radiofrequences emis par une station de base d'un reseau de radiocommunications, produit programme d'ordinateur et dispositif correspondants |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4073534A1 (fr) |
| FR (1) | FR3104266A1 (fr) |
| WO (1) | WO2021116595A1 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6978124B2 (en) * | 2002-12-11 | 2005-12-20 | Motorola, Inc. | Method and mobile station for autonomously determining an angle of arrival (AOA) estimation |
| US7313403B2 (en) * | 2003-08-06 | 2007-12-25 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Location positioning in wireless networks |
| GB2556339A (en) * | 2016-09-27 | 2018-05-30 | Zoneart Networks Ltd | Wireless access control system |
-
2019
- 2019-12-10 FR FR1914092A patent/FR3104266A1/fr not_active Ceased
-
2020
- 2020-12-08 WO PCT/FR2020/052341 patent/WO2021116595A1/fr not_active Ceased
- 2020-12-08 EP EP20842012.5A patent/EP4073534A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021116595A1 (fr) | 2021-06-17 |
| FR3104266A1 (fr) | 2021-06-11 |
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