EP4281794A1 - Traitement du délai pour une mesure de géolocalisation - Google Patents
Traitement du délai pour une mesure de géolocalisationInfo
- Publication number
- EP4281794A1 EP4281794A1 EP22705076.2A EP22705076A EP4281794A1 EP 4281794 A1 EP4281794 A1 EP 4281794A1 EP 22705076 A EP22705076 A EP 22705076A EP 4281794 A1 EP4281794 A1 EP 4281794A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- network entity
- transmission
- network
- radio unit
- 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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/022—Means for monitoring or calibrating
- G01S1/024—Means for monitoring or calibrating of beacon transmitters
-
- 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
- G01S5/0205—Details
- G01S5/0221—Receivers
- G01S5/02213—Receivers arranged in a network for determining the position of a transmitter
- G01S5/02216—Timing or synchronisation of the receivers
-
- 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
- G01S2205/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S2205/001—Transmission of position information to remote stations
- G01S2205/008—Transmission of position information to remote stations using a mobile telephone network
-
- 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
- G01S5/06—Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
-
- 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
- G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Definitions
- these estimates can be made by reference signal time difference measurements (“Reference Signal Time Difference” or RSTD in English or even ll-TDOA or Uplink Time Difference of Arrival) by the user terminal whose geolocation is sought to be determined.
- reference signals for example, positioning reference signals (PRS) can be sent by the distributed unit ("Digital Unit” or DU in English) of the radio access network ("Radio access network” or RAN in English) to the user terminal.
- PRS positioning reference signals
- PRS positioning reference signals
- the reference signal emitted by the DU is transmitted to a radio unit (“Radio Unit” or RU in English) of an antenna and then to the user terminal to be geolocated.
- U-TDOA reference signals can be sent from the user terminal to the distributed unit via an antenna.
- equipment of the DU type and of the RU type tends to be more and more distant from each other over distances which can vary from a few meters to several tens of kilometers.
- the travel time between these devices is no longer negligible and falsifies the geolocation measurements.
- a first aspect of the invention relates to a method for transmitting signals used for estimating the position of a user terminal, said method comprising:
- the transmission of a second signal between the network entity and the radio unit the second signal being intended to allow a measurement of a transmission path time between the network entity and the radio unit; wherein at least one value of a transmission condition of the second signal, called second value, is dependent on a value of a transmission condition of the first signal, called first value.
- transmission conditions between the network entity and the radio unit are the same or similar for the transmission of the first signal and the second signal.
- close transmission conditions i.e. values relative to each signal of these conditions which are close
- the differences between the transmission path times of the first and the second signal between the network entity and the radio unit are significantly reduced.
- transmission conditions it is understood both the conditions internal to the network (prioritization, resource allocation, routing path, buffering, channel coding, etc.) and the conditions external to the network (schedule , temperature variation, significant traffic fluctuation, electromagnetic interference, etc.). These transmission conditions impact the signal transmission time more or less significantly.
- the value of a condition of a signal means the value assigned to this condition by the network for this signal (for example, a priority level, an index of an allocated resource, an address through which the path passes routing time, buffering time, channel coding level, etc.) when it is a condition internal to the network or the value imposed by elements external to the network when it is This is a condition external to the network (transmission schedule, quantity of resource available at a point in the network, latency level, temperature of the transmission infrastructure, etc.).
- the signals used can be positioning reference (PRS).
- PRS positioning reference
- PRS sequences are particularly advantageous insofar as they have good autocorrelation properties and low cross-correlation, thus making it possible to precisely extract the PRS in order to measure its time of arrival.
- the network entity is the one that receives the signals and the user terminal transmits them, i.e. when the uplink is used, then the signals used can be timestamped when they are received by several network entities.
- radio unit is meant the radio transceiver which processes or produces the electrical signal transmitted to the antenna or received from the antenna and which corresponds to the radio signal transmitted or received by the antenna.
- the radio unit is the term used in the 5G standard but this unit can also be called remote radio head or "remote radio head” in English (RRH) or even remote radio unit or “radio remote unit” in English ( RRU).
- This radio unit is separate from the network entity.
- user terminal receiving radio signals from the radio unit it is understood that the terminal can at least partially decode the signals it receives from the radio unit.
- the user terminal can be connected to the base station corresponding to the radio unit.
- the transmission condition of the first signal may correspond to a transmission condition between the network entity and the radio unit.
- value of a transmission condition of a signal dependent on the value of the transmission condition of another signal it is understood that these values can be made dependent by the network entity or any other entity of the network involved in the transmission of these signals. Thus, if the value of a signal transmission condition is modified then the value of this same transmission condition of the other signal is also modified accordingly.
- the dependence of the two values can correspond to the fact that the two values are equal or that a distance between these two values is less than a threshold.
- the measurement of the transmission path time of a signal between the network entity and the radio unit can be performed by any known technique, in one direction or the other.
- a measurement of the transmission path time can be carried out by sending a signal comprising information relating to the time of its transmission and the receiver can then compare the time of arrival with the time of transmission of the signal.
- the measurement of the transmission path time between the network entity and the radio unit can then be performed by the network entity when the radio unit sends the second signal or by the radio unit when the network entity sends the second sign. In the latter case, the radio unit can transmit this measurement to the network entity if necessary (each time the network entity uses this measurement and it has not calculated it itself, it 'obtains via the radio unit).
- the transmission of a signal between two entities includes the transmission of this signal by one of the entities and the reception by the other or the reverse.
- the transmission of the first signal is a reception by the network entity of the first signal coming from the user terminal and the transmission of the second signal is a reception by the network entity of the second signal from the radio unit.
- the transmission of the second signal by the radio unit can be triggered by the reception by the radio unit of a third signal transmitted by the network entity.
- the network entity is a distributed unit, DU; and or
- the first signal is a positioning reference signal, PRS; and or
- the second signal is a transmission delay measurement signal with a start time set by the network entity and an arrival time measured by the radio unit (for the downlink mode, and vice versa for the uplink mode ).
- a delay between the transmission of the first signal and the remission of the second signal is less than a threshold.
- a delay between the reception of the first signal and the reception of the second signal is less than a threshold.
- the transmission between the entity of the network and the radio unit of the first signal and of the second signal are carried out simultaneously or at least in a certain temporal proximity.
- the time-varying transmission conditions remain the same or similar during the transmission of the first and the second signal between the network entity and the radio unit.
- the values relating to the first and second signal of at least some of the transmission conditions between the network entity and the radio unit are made dependent.
- the transmission condition variation has a lower frequency than the number of allocation units that it is possible to implement per second, or in other words lower than the number of reference signals that it is possible to transmit per second.
- the minimum allocation unit being the resource block (RB)
- this implementation is particularly advantageous when the frequency of the variation of the condition is lower than the number of RBs per second.
- the second signal is one of a set of signals sent by the network entity to the radio unit and intended to allow measurement of the transmission path time between the network entity. network and the radio unit and wherein the second signal is selected as having the second value most dependent on the first value.
- the most appropriate measurement may be that resulting from the second signal when the delay between the times of transmission of the first and second signal by the network entity is below the threshold.
- the signals transmitted by the network entity can be transmitted periodically to ensure a relevant set of travel time measurements.
- the most appropriate measurement of the transmission path time between the network entity and the radio unit may be the one having the same value or a close value (for example whose difference is less than a threshold) of the value of the transmission condition between the network entity and the radio unit of the first signal.
- the second signal is one of a set of signals sent by the radio unit to the network entity and intended to allow measurement of the transmission path time between the unit radio and the network entity and wherein the second signal is selected as having the second value most dependent on the first value.
- the transmission conditions between the network entity and the radio unit can also be considered as stable.
- the sending of the first and of the second signal when the transmission conditions are stable avoids any change in the transmission conditions between the moment of emission of the first signal and the moment of emission of the second signal.
- the radio unit periodically sends signals to the entity of the network, each of these signals being intended to allow the measurement of a time of the transmission path on the part of the communication network between the radio unit and the network entity, the network entity receives the first signal and the second signal when the measurements of the transmission path time of the signals sent in such a way periodic are stable.
- the network entity transmits the first signal and the first signal comprises the measurement of the transmission path time on the part of a communication network between the network entity and the radio unit. of the second signal.
- the network entity when the network entity measures the travel time of the second signal or the radio unit provides it with this measurement, the network entity can transmit this measurement with the first signal so that the terminal which receives the first signal can determine the travel time measurement of the first signal between it and the radio unit or send all this information to the server that performs the geolocation service.
- the transmission of another first signal between the network entity or another network entity and the user terminal via another radio unit the other first signal being intended to allow a measurement relating to a transmission path time between the network entity or the other network entity and the user terminal via the other radio unit;
- the transmission of another second signal between the network entity or the other network entity and the radio unit the second signal being intended to allow a measurement of a transmission path time between the network entity or the other network entity and the radio unit; wherein at least one other value of the transmission condition of the other first signal is dependent on a value of the transmission condition of the other second signal.
- the method implemented with the network entity, the radio unit and the user terminal is also carried out with another antenna (that is to say with the network entity, another radio unit and the user terminal when this other antenna is part of the same base station including the radio unit or with another network entity, another radio unit and the user terminal when this other antenna is part of a different base station than the one hosting the radio unit).
- another antenna that is to say with the network entity, another radio unit and the user terminal when this other antenna is part of the same base station including the radio unit or with another network entity, another radio unit and the user terminal when this other antenna is part of a different base station than the one hosting the radio unit.
- the network entity transmits to the data processing server carrying out the service for determining the position of the user terminal (geolocation) at least part of the measurements necessary for determining the position of the user terminal.
- These measurements can be a transmission travel time between the network entity and the terminal or the transmission travel time between the radio unit and the user terminal (the network entity then determines this time by comparing the transmission path between the network entity and the user terminal and the transmission path time between the network entity and the radio unit), it is an absolute measure of the travel time.
- These measurements can also be a time difference between times of reception by the user terminal of the first signal and of another signal; this is called RSTD (“Reference Signal Time Difference”).
- the geolocation server can adapt the information relating to a time difference between times of reception by the user terminal of the first signal and of the other first signal.
- the geolocation server can correct the RSTD by compensating for the error induced by not taking into account in the RSTD the transmission times of the reference signals between the network entity(ies) and the radio units.
- the network entity transmits the two pieces of information making it possible to calculate the position of the user terminal in the same message, thus reducing the resources of the network necessary for the implementation of the invention.
- the part of the communication network between the network entity and the radio unit comprises transport network equipment and the transport network equipment participates in the transmission of the first signal and of the second signal by applying for each of these transmissions the same value of a transmission parameter and/or the same routing and/or dedicated resources.
- the first signal and the second signal are processed and sent by the transport network equipment in a similar manner.
- processing and/or sending carried out in a differentiated manner may introduce separate processing and/or sending times between the first and the second signal. This ensures that the transmission path times remain similar between the first and the second signal, for the part between the network entity and the radio unit.
- the two signals are transmitted via the same routing path, which avoids differences in the transmission path time between the first and the second signal between the network entity and the radio unit due to transmissions over two routing paths of different lengths.
- the part of the communication network between the network entity and the radio unit is a part of the communication network used for the transmission of signals between the network entity and the radio unit.
- the transmission of the first and the second signal can be done via this part of the communication network.
- the part of the network can include all the elements of the network allowing the transmission of signals between the entity of the network and the radio unit.
- a value of a transmission parameter By applying a value of a transmission parameter to the transmission of a signal, it is understood that the processing (for example the timing or prioritization) of the signal received by the transport network equipment and/or its sending are carried out with the value of the transmission parameter (for example, by applying a delay time corresponding to the value, or by applying a level of prioritization or priority of the signal corresponding to the value).
- the network entity sends a message to the transport network equipment, the message comprising information from among a transmission parameter value to be applied. , a time period during which the value of the transmission parameter must be applied to signals originating from or destined for the entity of the network, information making it possible to identify the first and the second signal and resources used for the transmission of the first and second signal.
- a computer program comprising instructions for the implementation of all or part of a method as defined herein when these instructions are executed by a processor.
- a non-transitory, computer-readable recording medium on which such a program is recorded.
- a network entity of a communication network comprising: a network interface; a processor; and a memory storing instructions, so that when these instructions are executed by the processor, they configure the network entity to:
- transport network equipment comprising: a network interface; a processor; and a memory storing instructions, so that when these instructions are executed by the processor, they configure the transport network equipment to:
- a second signal coming from the network entity or from the radio unit being intended to allow a measurement of a transmission path time on a part of a communication network comprising the transport network equipment between the network entity and the radio unit;
- FIG. 2 illustrates a network entity, a transport network equipment, a radio unit and a user terminal according to one embodiment of the invention.
- FIG. 3 illustrates a flowchart representing the method according to the invention.
- FIG. 4 illustrates a flowchart representing the method according to the invention.
- the user terminal 1 of a user 2 is in the radio coverage of two radio antennas 3.0 and 4.0.
- the user terminal 1 receives the signals produced by the radio units (RU) 3.1 and 4.1 and transmitted respectively by the antennas 3.0 and 4.0.
- the 3.1 and 4.1 radio units are each connected to a 5.0 network entity.
- the links 3.2 and 4.2 between the network entity and the radio units 3.1 and 4.1 can be optical or even electrical links.
- the 5.0 network entity in the 5G standard is a distributed unit (DU).
- This network entity 5.0 sends signals to the radio units 3.1 and 4.1 which the radio units 3.1 and 4.1 convert into electrical signals inducing radio signals via the antennas 3.0 and 4.0.
- the 3.1 radio unit and the 5.0 network entity can be co-located, the link between the radio unit and the 5.0 network entity is then short, for example a few meters.
- the network entity 5.0 can also be located at a distance from the radio unit 4.1, for example several kilometers or tens of kilometers.
- a centralized unit (CU) 6 is also connected to the network entity 5.0.
- the separation of the functions of a base station means that it can consist of a centralized unit CU connected to one or more network entities DU, each DU being connected to one or more radio units RU.
- the geolocation of the user terminal 1 is done, among other things, by a measurement relating to the signal transmission travel time, for example reference signals such as the PRS, between the network entity 5.0 and the user terminal 1 .
- the network entity 5.0 sends a PRS to the user terminal 1 via the radio unit 3.1 and another PRS to the user terminal 1 via the radio unit 4.1.
- the user terminal measures the time difference A between the times of reception of these two signals PRS.
- the RSTD Reference Signal Time Difference
- RSTD Reference Signal Time Difference
- the measurements relating to the transmission path times T1 and T2 of the signals PRS1 and PRS2 on the links 3.2 and 4.2 include transmission path times t1 and t2 between the network entity 5.0 and each of the radio units 3.1 and 4.1 respectively.
- the measurement of times t1 and t2 can be made using dedicated signals S1 and S2 in the control plane between the network entity 5.0 and respectively each of the radio units 3.1 and 4.1.
- the geolocation of the user terminal 1 can be obtained by the direct measurement of the difference in times Ti and T2 of the transmission path of respectively PRS1 and PRS2, that is to say RSTD, from which is subtracted the difference between t1 and t2.
- the terminal 1 sends (for example, upon receipt of a message from the network entity) reference signals RS1 and RS2 to the network entity 5.0 respectively via the radio unit 3.1 and 4.1 .
- the radio units 3.1 and 4.1 send (for example, upon receipt of a message from the network entity) signals S′1 and S′2 to the network entity 5.0 to calculate ti and t2 respectively.
- the network entity 5.0 can then send to the geolocation server 7 the transmission time of RS1, RS2, S'1 and S'2 or directly correct RS1 with S'1 and RS2 with S'2, to send only the corrected value of RS1 and RS2 corresponding respectively to the transmission time between the terminal and each of the radio units 3.1 and 4.1.
- the geolocation server 7 then calculates the U-TDOA.
- the measurements of times ti and t2 and the transmission of PRS1 and PRS2 respectively RS1 and RS2, to determine the RSTD, respectively the U-TDO, are triggered by a request to the geolocation server 7 (Geoloc) requesting positioning of the user terminal 1. This can be required by an application of the user terminal 1 or by a request external to the terminal, for example, to geolocate the user 2 of the terminal 1 .
- the server 7 triggers with the centralized unit 6 which controls the network entity 5.0 the measurements of the times ti and t2 and the transmission of the PRS1 and PRS2.
- these transport network equipments process and transmit the signals by applying a transmission parameter value (for example, the priority level of a signal, or even the modulation and coding/decoding schemes) which directly impacts the time processing by the equipment and therefore influences the transmission path time of PRS2 (respectively RS2) and of the signal S2 (respectively S′2) transmitted between the radio unit 4.1 and the network entity 5.0.
- a transmission parameter value for example, the priority level of a signal, or even the modulation and coding/decoding schemes
- the network entity 5.0 of Figure 1 and Figure 2 comprises a module (INT) 5.1 interface with the communication network, that is to say an interface for receiving and transmitting signals with the radio units 3.1 and 4.1 and by extension with the user terminal 1 and making it possible to receive commands from the centralized unit 6 and to send to the server 7, possibly via the centralized unit 6, the measurements RSTD, ti and t2.
- INT module 5.1 interface with the communication network, that is to say an interface for receiving and transmitting signals with the radio units 3.1 and 4.1 and by extension with the user terminal 1 and making it possible to receive commands from the centralized unit 6 and to send to the server 7, possibly via the centralized unit 6, the measurements RSTD, ti and t2.
- the network entity 5.0 also includes a processor (PROC) 5.2 and a memory (MEMO) 5.3.
- the memory 5.3 comprises a non-volatile memory on which the computer program is stored and a volatile memory on which the parameters are stored for the implementation of the invention, for example, the transmission parameter values to be applied, transmission path time measurements between the network entity and the radio units (ti and t2) associated with transmission condition values (for example, transmission parameters and/or routing paths and/or resources specific), a threshold 5, an emission period of the signals S1 and S2 or S'1 and S'2.
- FIG. 3 represents a flowchart of a method according to one embodiment of the invention.
- step St1 the network entity is configured, that is to say that the threshold 5 is recorded in the memory 5.3 of the network entity 5.0.
- step St2 the server 7 receives a geolocation request from the user terminal 1, for example, a request sent by a supervision entity further upstream in the network, or by an application from the user terminal 1.
- the server 7 sends a request to measure the RSTD or U-TDOA to the centralized unit 6.
- the measurements of the times ti and t2 will also be requested or in any case sent to the server 7.
- step St4 the centralized unit 6 sends a message through a control channel to the network entity 5.0 to trigger the measurement protocol relating to the travel time.
- the network entity 5.0 which received the message, sends the signals PRS1 and PRS2, PRS1 being sent to the user terminal 1 via the radio unit 3.1 and PRS2 being sent to the user terminal 1 via the radio unit 4.1.
- the network entity 5.0 transmits in the control plane the signals S1 and S2 intended respectively for the radio units 3.1 and 4.1.
- the time difference between the sending of the signal PRS1 (respectively PRS2) and the sending of the signal S1 (respectively S2) is less than a threshold 5, for example, less than 1 ms.
- a time slot defined by the network entity 5.0 is configured so that the time difference between the sending of the signal RS 1 (respectively of the signal RS 2) by the user terminal 1 and the reception of the signal S'1 (respectively S'2) by the network entity 5.0 is less than the threshold 5.
- the network entity 5.0 can receive the signals S1 and S2 in the time slot and the duration of the time slot is less than the threshold 5.
- the network entity 5.0 can send messages to the radio units 3.1 and 4.1 in the control plane to trigger the sending by the radio units 3.1 and 4.1 respectively of the signals S'1 and S'2 to the network entity 5.0 in the time slot.
- the network entity 5.0 does not send the signals PRS1 and PRS2 to the user terminal 1 or the signals S1 and S2 to the radio units 3.1 and 4.1 respectively.
- the messages sent to the radio units 3.1 and 4.1 and to the user terminal 1 can specify that the sending of the signals S'1 and S'2 and of the signals RS1 and RS2 must be done in a time slot defined by the network entity 5.0.
- the time slot defined by the network entity 5.0 is configured so that the time differences between the sending of the signal RS1 and respectively of the signal RS2 by the user terminal 1 and the sending of the signal S'1 and respectively S'2 by radio units 3.1 and 4.1 are below threshold 5.
- step St6.1 user terminal 1 receives signals PRS1 and PRS2 transmitted by network entity 5.0 (downstream mode) or alternatively network entity 5.0 receives signals RS1 and RS2 (upstream mode).
- the network entity 5.0 receives the signals S'1 and S'2 transmitted respectively by the radio units 3.1 and 4.1 (upstream mode) or alternatively the radio units 3.1 and 4.1 receive the signals S1 and S2 transmitted by the network entity 5.0 (downstream mode).
- the network entity 5.0 receives the RSTD measurement of the time difference between the time of receipt of PRS1 and PRS2 made by the user terminal 1 (downstream mode) or the network entity 5.0 measures the time difference between the time of receipt of RS1 and RS2 (upstream mode).
- the network entity 5.0 receives the measurements of the times ti and t2 carried out respectively by the radio units 3.1 and 4.1 (downstream mode) or the network entity 5.0 measures the times ti and t2 when the radio units 3.1 and 4.1 respectively send S'1 and S'2 (up mode).
- the network entity 5.0 sends the RSTD to the server 7 or sends to the geolocation server 7 the transmission times of RS1 and RS2.
- the network entity 5.0 sends ti and t2 to the server 7, possibly at the request of the server 7.
- the server 7 can determine the position of the user terminal 1 on the basis of the corrected RSTD and possibly on other corrected RSTD measurements obtained separately or on the basis of the transmission times of RS1 and RS2.
- FIG. 4 represents a flowchart of a method according to one embodiment of the invention. This embodiment involves the participation of at least one transport network equipment located between the network entity 5.0 and a radio unit.
- step St'1 the network entity is parameterized, for example, the transmission parameter values (signal priority), the routing paths and/or the specific resources to be applied are recorded in the memory 5.3 of the network entity 5.0.
- step St'3 the server 7 sends a request for measurement of the RSTD or ll-TDOA to the centralized unit 6.
- the measurements of the times ti and t2 will also be requested or in any case sent to the server 7.
- step St'4 the centralized unit 6 sends a message through a control channel to the network entity 5.0 to trigger the measurement protocol relating to the travel time.
- network entity 5.0 transmits signals PRS1 and PRS2, PRS1 being sent to user terminal 1 via radio unit 3.1 and PRS2 being sent to user terminal 1 via the radio unit 4.1.
- the network entity 5.0 sends to the user terminal 1 a message in the control plane to trigger the sending by the user terminal 1 of the reference signals RS1 and RS2 to the network entity 5.0 respectively via the 3.1 and 4.1 radio unit.
- the network entity 5.0 can transmit in the control plane the signals S1 and S2 to destination respectively of the radio units 3.1 and 4.1 (downstream mode) or the radio units 3.1 and 4.1 can send the signals S′1 and S′2 to the network entity (upstream mode).
- the calculation of ti and t2 can be done before the server 7 receives a geolocation request 7, for example at the time of parameterization of the network entity 5.0 .
- the t-i.o; t2,o can correspond to the travel time when the network load on links 3.2 and 4.2 is low
- ti ,1; t2,i can correspond to the travel time when the network load is average on links 3.2 and 4.2, etc.
- the ti ,i and t2,i can also be associated with the priority levels applied to the signals S1 , S2 or S'1 , S'2 for their calculation.
- the ti j and t2j can also be associated with different routing paths used to transport the signals S1, S2 or S'1, S'2. It is possible to combine several transmission conditions, and thus to associate with tu and t2,i of the list several values, for example a priority level and a value corresponding to a routing path.
- step St'7.1 user terminal 1 receives signal PRS1 transmitted by network entity 5.0 or alternatively network entity 5.0 receives signal RS1.
- step St'7.2 the transport network equipment 8 receives, processes and retransmits the PRS2 or RS2 signal in accordance with the control message received from the network entity 5.0 during step St'5 .
- the transport network equipment 8 applies this priority level and routes the PRS2 or RS2 signals accordingly.
- the transport network equipment 8 receives, processes and retransmits the signal S2 or S′2 in accordance with the control message received from the network entity 5.0, that is to say in the same way as the transport network equipment 8 receives, processes and retransmits the signal RS2 or PRS2.
- step St'7.3 the user terminal 1 receives the PRS2 signal transmitted by the network entity 5.0 (downstream mode) or alternatively the network entity 5.0 receives the RS2 signal transmitted by the user terminal 1 (upstream mode ).
- the network entity 5.0 receives the RSTD measurement of the time difference between the time of receipt of PRS1 and PRS2 performed by the user terminal 1 (downstream mode) or the network entity 5.0 calculation of the transmission times of RS1 and RS2 (upstream mode).
- the network entity 5.0 selects the time ti. P , that is to say that the network entity 5.0 selects the time among the (ti, P ) P having been obtained by measuring the transmission path time of the signal S1 or (S'1 ) having the same conditions transmission than those of the PRS1 or RS1 signal.
- the network entity 5.0 sends the RSTD to the server 7 or the transmission times of RS1 and RS2.
- the network entity 5.0 sends ti and t2 to the server 7, possibly at the request of the server 7.
- the server 7 can determine the position of the user terminal 1 on the basis of the RSTD corrected and possibly on other corrected RSTD measurements obtained separately or on the basis of the transmission times of RS1 and RS2.
- step St'6 of the embodiment of Fig. 4 is applied in the same way as step St5 of the embodiment of FIG. 3. In this case, this amounts to adding step St'5 after step St4 in the mode of FIG. 3 and the transport network equipment 8 implements step St'7.2.
- the embodiment of Figure 4 may also involve the participation of transport network equipment located between the network entity 5.0 and the radio unit 3.1, in addition to the equipment 8 located between the network entity 5.0 and the radio unit 4.1
- the network entity 5.0 can obtain times ti and t2 before sending PRS1 and PRS2. In this case, the network entity 5.0 can obtain the times ti and t2 in order to then insert these times into the signal PRS1 and PRS2 intended for the user terminal 1.
- the user terminal 1 can then not only determine the RSTD but correct it at the using times ti and t2, before transmitting the corrected RSTD to the network entity 5.0 or even directly to the server 7.
- FIG. 5 represents a flowchart of a method according to one embodiment of the invention.
- step St”1 the network entity is configured.
- step St”2 the server 7 receives a geolocation request 7 requesting the positioning of the user terminal 1, for example, a request sent by a supervision entity further upstream in the network, or by a user terminal application 1 .
- step St”3 the server 7 sends a request for measurement of the RSTD or ll-TDOA to the centralized unit 6. The measurements of the times ti and t2 will also be requested or in any case sent to the server 7.
- step St”4 the centralized unit 6 sends a message through a control channel to the network entity 5.0 to trigger the measurement protocol relating to travel time.
- step St”5 in descending mode, the network entity 5.0 periodically transmits in the control plane the signals S1 and S2 intended respectively for the radio units 3.1 and 4.1.
- the network entity 5.0 can send messages to the radio units 3.1 and 4.1 in the control plane to trigger the periodic sending by the radio units 3.1 and 4.1 respectively of the signals S'1 and S'2 to the 5.0 network entity.
- the network entity 5.0 sends the signals PRS1 and PRS2 ( down mode) or sends to the user terminal 1 a message in the control plane to trigger the sending by the user terminal 1 of the reference signals RS1 and RS2 to the network entity 5.0 (up mode).
- the network entity 5.0 receives the measurement RSTD of the time difference between the moment of reception of PRS1 and PRS2 carried out by the user terminal 1 (downstream mode) or the network entity 5.0 measures the transmission time of RS1 and RS2 (upstream mode).
- the network entity 5.0 sends the RSTD to the server 7 or the transmission time of RS1 and RS2.
- the network entity 5.0 sends ti and t2 to the server 7, possibly at the request of the server 7.
- the server 7 can determine the position of the user terminal 1 based on the corrected RSTD and possibly on other corrected RSTD measurements obtained separately or on the basis of the transmission times of RS1 and RS2.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2100617A FR3119244A1 (fr) | 2021-01-22 | 2021-01-22 | Traitement du délai pour une mesure de géolocalisation |
| PCT/FR2022/050118 WO2022157463A1 (fr) | 2021-01-22 | 2022-01-21 | Traitement du délai pour une mesure de géolocalisation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4281794A1 true EP4281794A1 (fr) | 2023-11-29 |
Family
ID=75339895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22705076.2A Pending EP4281794A1 (fr) | 2021-01-22 | 2022-01-21 | Traitement du délai pour une mesure de géolocalisation |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20240077569A1 (fr) |
| EP (1) | EP4281794A1 (fr) |
| FR (1) | FR3119244A1 (fr) |
| WO (1) | WO2022157463A1 (fr) |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6907238B2 (en) * | 2002-08-30 | 2005-06-14 | Qualcomm Incorporated | Beacon for locating and tracking wireless terminals |
| FR2865837A1 (fr) * | 2004-01-30 | 2005-08-05 | Groupe Sofide | Systeme d'information cooperatif, entre des vehicules et un centre de supervision, portant sur la generation d'informations de type info-trafic, et utilisant un procede hf economique de transfert |
| US7733224B2 (en) * | 2006-06-30 | 2010-06-08 | Bao Tran | Mesh network personal emergency response appliance |
| JP4840395B2 (ja) * | 2008-04-18 | 2011-12-21 | ソニー株式会社 | 情報処理装置、プログラム、情報処理方法、および情報処理システム |
| EP3454625A3 (fr) * | 2008-09-10 | 2019-06-05 | NextNav, LLC | Système de positionnement de zone étendue |
| EP2364568B1 (fr) * | 2008-11-06 | 2017-12-20 | Wireless Future Technologies Inc. | Services de localisation de dispositif sans fil |
| WO2015077767A1 (fr) * | 2013-11-25 | 2015-05-28 | Daniel Ryan | Système et procédé de communication avec un dispositif mobile via un système de positionnement comprenant des dispositifs de communication rf des sources lumineuses balises modulées |
| WO2015135581A1 (fr) * | 2014-03-12 | 2015-09-17 | Telefonaktiebolaget L M Ericsson (Publ) | Localisation de terminaux dans un réseau de communication |
| WO2016076782A1 (fr) * | 2014-11-10 | 2016-05-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Signalisation et utilisation d'un blocage de crs dans une cellule partagée à des fins de positionnement |
| WO2016145371A2 (fr) * | 2015-03-11 | 2016-09-15 | Phluido, Inc. | Réseau d'accès radio distribué comprenant une liaison de raccordement aux sites cellulaires adaptative |
| US11601911B2 (en) * | 2018-05-25 | 2023-03-07 | Qualcomm Incorporated | Determining timing resolution and range of reported timing measurements used for position estimation |
| US11442135B2 (en) * | 2018-05-31 | 2022-09-13 | Qualcomm Incorporated | Positioning methods for wireless networks that utilize beamformed communication |
| EP3857736B1 (fr) * | 2018-09-27 | 2022-03-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Détection de satellites voisins dans des systèmes de communication sans fil |
| US10791527B2 (en) * | 2018-10-17 | 2020-09-29 | Samsung Electronics Co., Ltd. | Apparatus for signaling of control messages for fronthaul interface |
| US11490354B2 (en) * | 2019-01-11 | 2022-11-01 | Qualcomm Incorporated | Round-trip-time (RTT)-based positioning with listening nodes |
| US11445464B2 (en) * | 2019-01-11 | 2022-09-13 | Qualcomm Incorporated | Group reporting of user equipment measurements in multi-round trip time positioning |
| KR102727494B1 (ko) * | 2019-12-01 | 2024-11-06 | 엘지전자 주식회사 | 무선 통신 시스템에서 채널을 추정하기 위한 방법 및 장치 |
| WO2021153157A1 (fr) * | 2020-01-28 | 2021-08-05 | Sharp Kabushiki Kaisha | Régulation de puissance pour fronthaul de nœud iab |
| KR102931950B1 (ko) * | 2020-02-07 | 2026-02-26 | 퀄컴 인코포레이티드 | 5g 뉴 라디오에서 비-지상 네트워크들에 대한 세컨더리 포지셔닝 레퍼런스 신호들 |
| US12414063B2 (en) * | 2020-07-01 | 2025-09-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Fronthaul network unit and method therein for synchronization over a fronthaul network |
-
2021
- 2021-01-22 FR FR2100617A patent/FR3119244A1/fr not_active Ceased
-
2022
- 2022-01-21 WO PCT/FR2022/050118 patent/WO2022157463A1/fr not_active Ceased
- 2022-01-21 US US18/262,490 patent/US20240077569A1/en active Pending
- 2022-01-21 EP EP22705076.2A patent/EP4281794A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20240077569A1 (en) | 2024-03-07 |
| WO2022157463A1 (fr) | 2022-07-28 |
| FR3119244A1 (fr) | 2022-07-29 |
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