RU2805220C1 - Method and apparatus for positioning in a wireless communication system - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: performing a measurement of the first type for positioning, including a carrier phase measurement (CPM); performing a second type measurement for positioning that is different from the first type measurement; and generating messages for the first type measurement and the second type measurement, wherein the number of time points associated with the second type measurement may be equal to or greater than the number of time points for the first type measurement.

EFFECT: improving the accuracy and efficiency of positioning in a wireless communication system.

15 cl, 11 dwg

Description

Field of technology to which the invention relates

The present invention relates to a wireless communication system, and in particular relates to a method and apparatus for a positioning procedure including measurement for positioning.

State of the art

Wireless access systems are widely deployed to provide various types of communication services such as voice or data. In general, a wireless access system is a multiple access system that supports communication between multiple users by sharing available system resources (bandwidth, transmission power, etc.) among them. For example, multiple access systems include, for example, a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, a orthogonal frequency division multiple access (OFDMA) and single carrier frequency division multiple access (SC-FDMA).

The essence of the invention

Technical challenge

The object of the present invention is to provide a method and apparatus for performing a positioning procedure efficiently and accurately.

Those skilled in the art will appreciate that the objects that may be achieved by the present invention are not limited to those specifically described above, and the above and other objects that the present disclosure may achieve will be more clearly understood from the following detailed descriptions.

Technical solution

In an aspect of the present invention, a method of performing a positioning measurement by a user equipment (UE) in a wireless communication system may comprise performing a first type of positioning measurement including a carrier phase measurement (CPM); performing a second type of measurement for positioning that is different from the first type of measurement; and generating messages for a measurement of the first type and a measurement of the second type, wherein the number of times associated with the measurement of the second type may be equal to or greater than the number of times for the measurement of the first type.

Preferably, the first type of measurement can be performed on a single time point basis, and the second type of measurement can be performed on a multiple time point basis.

Preferably, one result obtained from a measurement of the second type may be associated with a plurality of results obtained from a measurement of the first type.

Preferably, the plurality of results obtained from the first type of measurement may have a plurality of timestamp values that are different from each other.

Preferably, the UE may transmit a UE characteristics message including at least one of first information regarding whether or not the UE supports a first type of measurement and second information related to the number of times supported by the UE for a second type of measurement. .

Preferably, the UE may receive third information regarding the number of times associated with the second type of measurement.

Preferably, the third information may include a minimum number of times associated with the second type of measurement.

Preferably, the UE may transmit the UE's preferred number of times associated with the second type of measurement.

Preferably, a measurement of the first type and a measurement of the second type may be reported in a single measurement message.

Preferably, one measurement message may include a number of times associated with a second type of measurement.

Preferably, one measurement message may include timestamp information for the first type of measurement.

Preferably, the timestamp information for the first type of measurement may represent a point in time at which the first type of measurement is performed.

Preferably, the second type measurement may include at least one of a downlink reference time difference (DL-RSTD) measurement, an uplink relative time of arrival (UL-RTOA) measurement, or a receive time difference measurement. -transmissions.

A non-volatile medium storing instructions that instruct a processor to carry out a method may be provided in accordance with another aspect of the present invention.

An apparatus implementing a method for performing positioning measurement may be provided according to another aspect of the present invention.

Advantages of the invention

According to the present disclosure, a positioning procedure can be efficiently and accurately performed in a wireless communication system.

Those skilled in the art will appreciate that the benefits that can be achieved by the present invention are not limited to those specifically described above, and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings. .

Brief description of drawings

Fig. 1 illustrates physical channels and a general method for transmitting signals using physical channels in a 3rd Generation Partnership Project (3GPP) system as an exemplary wireless communication system;

Fig. 2 illustrates a 5C system architecture applicable to the positioning of a UE connected to an NG-RAN or E-UTRAN;

Fig. 3 illustrates a positioning method based on observed time difference of arrival (OTDOA);

Fig. 4 illustrates integer ambiguity resolution for the ToA of four different (correct) BS sets;

Fig. 5 illustrates the rejection of outliers by minimizing the MSE of observations;

Fig. 6 illustrates the performance gain due to proper processing of successive bursts of PRS frames;

Fig. 7 illustrates messaging during CP positioning;

Fig. 8 illustrates UE positioning measurements in an embodiment of the present invention;

Fig. 9 illustrates a method for performing positioning measurement according to an embodiment of the present invention;

Fig. 10 illustrates an exemplary communication system applicable to the present disclosure; And

Fig. 11 illustrates an exemplary wireless device applicable to the present disclosure.

Optimal mode for carrying out the invention

The following technology can be used in various wireless access systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access ( 0FDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as a radio technology such as Global System for Mobile Communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rate GSM (EDGE). 0FDMA can be implemented as a radio technology such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard (a high-quality

Wireless (Wi-Fi)), IEEE 802.16 (WiMax), IEEE 802.20, Enhanced UTRA (E-UTRA), etc. UTRA forms part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard forms part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE Evolved (LTE-A) standard is an evolution of 3GPP LTE. The 3GPP New Radio Standard or New Radio Standard (NR) access technology is an enhanced version of 3GPP LTE/LTE-A.

As more and more communication devices require greater communication capacity, there is a need for communications based on an enhanced mobile broadband standard over legacy Radio Access Technologies (RATs). Massive Machine Communications (MTC), which provides various services to interconnected multiple devices and things at any time, anywhere, is one of the critical problems that must be solved for next generation communications. A communication system design solution that addresses reliability and latency sensitive services is also discussed. In this regard, the introduction of next generation radio access technology (RAT) for communications based on the enhanced mobile broadband (eMBB), mass MTS (tMTS) and ultra-reliable low latency communications (URLLC) standard is being discussed. For convenience, this technology is referred to as "NR" or "new RAT" in this disclosure.

Although the following description is given in the context of a 3GPP communication system (eg, NR) for the sake of clarity, the technical spirit of the present invention is not limited to the 3GPP communication system. For the prior art, terms and abbreviations used in this disclosure refer to specifications published prior to the present invention (eg, 3GPP TS 38.211, 38.212, 38.213, 38.214, 38.300, 38.331, etc.).

In a wireless access system, a user equipment (UE) receives information from a base station (BS) over DL and transmits information to the BS over UL. Information transmitted and received between the UE and BS includes general data and various types of control information. A plurality of physical channels are provided according to the types/uses of information transmitted and received between the BS and the UE.

Fig. 1 illustrates physical channels and a general method of signaling using physical channels in a 3GPP system.

When the UE turns on or enters a new cell, the UE performs an initial cell search (S11). The initial cell search involves obtaining synchronization with the BS. For this purpose, the UE receives a synchronization signal block (SSB) from the BS. SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH). The UE synchronizes its time synchronization with the BS and obtains information such as cell ID based on PSS/SSS. Additionally, the UE can obtain information broadcast in the cell by receiving the Strategic Missile Forces from the BS. During the initial cell search, the UE may also monitor the status of DL channels by receiving a downlink reference signal (DL RS).

After the initial cell search, the UE can obtain more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) corresponding to the PDCCH (S12).

Then, to terminate the connection with the BS, the UE may perform a random access procedure with the BS (S13-S16). Specifically, the UE may transmit a preamble on a physical random access channel (PRACH) (S13) and may receive a PDCCH and a random access response (RAR) for the preamble on a PDSCH corresponding to a PDCCH (S14). The UE can then transmit a physical uplink shared channel (PUSCH) by using scheduling information in the RAR (S15) and perform a contention-based collision resolution procedure including receiving a PDCCH and a PDSCH signal corresponding to the PDCCH (S16).

When the random access procedure is performed in two steps, steps S13 and S15 may be performed as one step (in which message A is transmitted by the UE), and steps S14 and S16 may be performed as one step (in which message B is transmitted by the BS).

After the above procedure, the UE may receive PDCCH and/or PDSCH from the BS (S17) and transmit a physical uplink shared channel (PUSCH) and/or a physical uplink control channel (PUCCH) to the BS (S18) in a general transmission procedure UL/DL signals. The control information that the UE transmits to the BS is collectively called "uplink control information (UCI)". The UCI includes acknowledgment/rejection of hybrid automatic request for retransmission (HARQ-ACK/NACK), dispatch request (SR), channel state information (CSI), etc. CSI includes Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), Rank Indicator (RI), etc. In general, UCI is transmitted over PUCCH. However, if control information and data are to be transmitted simultaneously, the control information and data may be transmitted on PUSCH. In addition, the UE may transmit UCI aperiodically on PUSCH when receiving a request/command from the network.

The UE may perform a network access procedure to perform the described/proposed procedures and/or methods. For example, the UE may receive and store system information and configuration information required in order to perform the above-described/proposed procedures and/or methods while accessing a network (eg, a BS). The configuration information required for the present invention may be received through upper layer signaling (eg, radio resource control (RRC) signaling, media access control (MAC) signaling, and the like).

Positioning

Positioning may mean determining the geographic position and/or speed of a UE based on measurements of radio signals. Location information may be requested and reported to a client (eg, application) associated with the UE. Location information may also be requested by a client within or connected to the core network. The location information may be reported in standard formats, for example, formats for cell-based or geographic coordinates, along with estimated UE position and speed errors and/or the positioning method used for positioning.

Fig. 2 illustrates a 5C system architecture applicable to the positioning of a UE connected to an NG-RAN or E-UTRAN.

Referring to FIG. 2, the AMF may receive a request for a location service associated with a particular target UE from another entity, such as a gateway mobile location center (GMLC), or the AMF directly determines the need to initiate a location service on behalf of a particular target UE. The AMF then passes the location service request to the location management function (LMF). When receiving a location service request, the LMF may process the location service request and then returns a processing result including the estimated position of the UE to the AMF. In the case of a location service requested by an entity such as a GMLC other than an AMF, the AMF may transmit a processing result received from the LMF to that entity.

The Next Generation Enhanced NB (ng-eNB) and gNB are NG-RAN network elements capable of providing measurement results for positioning. The Ng-eNB and gNB can measure the radio signals for the target UE and transmit the measurement result value to the LMF. The Ng-eNB can manage multiple TPs, such as remote radio heads or PRS-only TPs to support a PRS-based beacon system for E-UTRA.

The LMF connects to an enhanced serving mobile location center (E-SMLC), which can enable the LMF to access the E-UTRAN. For example, the E-SMLC may enable the LMF to support OTDOA, which is one of the E-UTRAN positioning methods, using DL measurement received by the target UE via signals transmitted by the eNB and/or TP for PRS only in the E-UTRAN .

The LMF can connect to a SUPL location platform (SLP). The LMF can support and manage various location services for target UEs. The LMF may interact with the serving ng-eNB or serving gNB for the target UE in order to obtain a position measurement for the UE. To position a target UE, the LMF may determine positioning methods based on the type of location service (LCS) clients, required quality of service (QoS), UE positioning characteristics, gNB positioning characteristics, and

positioning the ng-eNB and then apply these positioning methods to the serving gNB and/or serving ng-eNB. LMF can determine additional information such as location estimation accuracy and speed of the target UE. The SLP is a Protected User Plane Positioning (SUPL) entity responsible for user plane positioning.

The UE can measure its position using DL-RS transmitted via NG-RAN and E-UTRAN. DL-RS transmitted by NG-RAN and E-UTRAN to the UE may include SS/Strategic Rocket Unit, CSI-RS and/or PRS. Which DL-RS is used to measure the position of the UE may correspond to the configuration of LMF/E-SMLC/ng-eNB/E-UTRAN, etc. The UE's position may be measured through a RAT-independent scheme using various Global Navigation Satellite Systems (GNSS), Terrestrial Beacon Systems (TBS), WLAN access points, Bluetooth beacons, and sensors (eg, barometric sensors) installed in the UE. The UE may also contain LCS applications or access an LCS application through communication with a network accessible thereby or through another application contained therein. The LCS application may include measurement and calculation functions required to determine the position of the UE. For example, the UE may contain an independent positioning function, such as a global positioning system (GPS), and report its position independently of the NG-RAN transmission. Such independently acquired positioning information can be used as auxiliary information for positioning information obtained from the network.

Positioning methods supported in NG-RAN may include GNSS, OTDOA, E-CID, barometric positioning, WLAN positioning, Bluetooth positioning, TBS, uplink time difference of arrival (UTDOA), etc. d. Although any one of the positioning methods may be used to position the UE, two or more positioning methods may be used to position the UE.

Fig. 3 is a diagram illustrating a positioning method based on observed time difference of arrival (OTDOA);

The OTDOA positioning method uses time measured for DL signals received from multiple TPs including eNB, ng-eNB and PRS-only TPs by the UE. The UE measures the timing of the received DL signals using location assistance data received from the location server. The position of the UE may be determined based on this measurement result and the geographic coordinates of neighboring TRs.

The UE connected to the gNB may request measurement signal absence intervals to perform OTDOA measurement from the TP. If the UE does not have SFN information of at least one TP in the OTDOA ancillary data, the UE may use autonomous signal dead intervals to obtain the SFN of the reference OTDOA cell before requesting signal dead intervals for measurements to perform a reference arrival time difference measurement. signals (RSTD).

Here, RSTD may be specified as the smallest relative time difference between two subframe boundaries received from the reference cell and the measurement cell. Thus, RSTD can be calculated as the relative time difference between the start time of a subframe received from the measurement cell and the start time of the subframe from the reference cell that is closest to the subframe received from the measurement cell. The reference cell may be selected by the UE.

For accurate OTDOA measurement, it is necessary to measure the time of arrival (ToA) of signals received from geographically distributed three or more TPs or BSs. For example, the ToA for each TP 1, TP 2 and TP 3 may be measured, and the RSTD for TP 1 and TP 2, the RSTD for TP 2 and TP 3, and the RSTD for TP 3 and TP 1 are calculated based on the three ToA values. The geometric hyperbola is determined based on the calculated RSTD values, and the point at which the hyperbola curves intersect can be estimated as the UE position. In this case, accuracy and/or uncertainty for each ToA measurement may occur, and the estimated position of the UE may be known as a specific range according to the measurement uncertainty.

Carrier phase positioning (CPP)

The following documents are contained at this link:

[1] Intel, “Revised SID on Study on expanded and improved NR positioning” RP-213588, e-Meeting, December 6-17, 2021

[2] RANI Chair's Notes, RANI #109-e, e-Meeting, May 9-20, 2022

[3] LGE, "Discussion on OFDM based carrier phase measurement in NR", R1-2207710, Toulouse, France, August 22-26, 2022

[4] Han Dun, Christian S.J. M. Tiberius and Gerard J. M. Janssen "Positioning in the multipath channel using OFDM signals with carrier phase tracking", IEEE Access, edition 8, pp. 13011-13028, January 2020 5G NR continues to expand its functionality into new areas and use cases. Positioning, location management functionality is a very useful supporting feature of any communication system and its development continues within the technical requirements. Starting from the simplest cell/sector based location in 2G/36 systems, positioning accuracy is significantly improved in LTE versions. The scalable 5G architecture enables more complex positioning tasks and addresses scenarios that may require millimeter precision. One example of such a scenario/use case model is an "indoor factory" where 5G-NR based sensors can help track the movements of containers and parts. Applications in robotics and manufacturing require extremely precise positioning that cannot be achieved through traditional means.

The use of traditional correlation-based positioning methods imposes minimal requirements on the synchronization/interaction of the RF TX and RX chains and transceiver devices. For such approaches, the accuracy is highly dependent on the signal bandwidth and is therefore limited by the amount of available resources.

Sub-centimeter and millimeter positioning accuracy in this case can only be achieved on the upper FR2-4acTOTax, where more bandwidth can be allocated for positioning purposes. Although for FR1 frequencies below 6 GHz, the full BW and therefore positioning accuracy using baseband correlation and CIR estimation techniques is limited.

One promising approach for high-precision positioning is carrier phase positioning (CPP) based on carrier phase measurements (CPM). For such approaches, the accuracy depends mainly on the frequency of the carrier phase, which can significantly exceed the BW of the signal.

However, the ability to estimate and track the carrier phase of signals imposes stringent requirements on the stability of the oscillators and the need to calibrate and synchronize the TX/RX chains. Various difference finding and double difference finding methods can be used to resolve the above difficulties.

Even in the case of perfect TX and RX phase locking, there is a fundamental problem of phase periodicity - accurate knowledge of the phase of the signal provides only the fractional part of the wavelength-based distance measurements, while the integer part cannot be obtained solely through phase measurements. This presents a problem known as integer ambiguity resolution (IAR). Methods for resolving integer ambiguity work successfully in GPS systems and are also being considered for CPM positioning in OFDM systems [4]. Typical solutions that help resolve integer ambiguity in a modern positioning communication system are as follows:

- Use of several (three or more) carriers;

- Use of several reference points (satellites) for double finding of differences and TDoA positioning; and/or

- The use of constant signals, which makes it possible to track objects.

For a carrier phase positioning system based on 5G NR infrastructure, the use of multiple carriers for the sole purpose of positioning is highly undesirable and is therefore not considered. With simultaneous packet-switched network traffic with multiple users transmitting data as the primary task with positioning as a secondary feature, a constant flow of dedicated positioning signals is not possible. Regular distance estimate updates may not be available for a 5G NR system due to traffic prioritization and system load.

Thus, for 5G NR CPP, it is necessary to offer a technology that enables reliable single-carrier IAR in packet-switched mode based on one or more sequential observations (multiple samples/instances).

Let's consider positioning according to ToA geometry as a function of TRP coordinates from a subset of M base stations and measured distances between the selected UE and the m-th TRP:

Equation 1 can be used to obtain a rough estimate of the ToA position by using a suboptimal set of stations, as explained in the previous section.

By measuring distance by carrier phase, a highly accurate estimate of the fractional wavelength portion of the measured distance can be provided. The carrier phase estimate of the total distance should consist of an integer N and a fractional part A, as shown in Equation 2.

By approximate distance measurements based on the baseline, the initial assumption regarding integer ambiguity can be represented as Equation 3:

However, this initial guess may differ from the actual value of N by an amount specified by the accuracy of the underlying ranging algorithm. For simplicity, let's assume that a 95-99% confidence interval for the d distance estimate can be considered, which can be expressed in wavelengths. For example, for a good estimate of 100 MHz, the range value may be within three wavelengths of the original rough guess (N=3). By denoting this integer error value as K, the setting could be as follows:

Due to such preparation, a cloud of points in three-dimensional space can be obtained, according to the solution of equation 1 for all possible values of N:

Since the search must be performed independently for each TRP and corresponding distance measurement d, the total number of points in the cloud must be (2K+1)M.

Equation 5 provides a point cloud for each possible integer number of wavelengths per measured distance. The true position is located among them, but one cloud is not enough to resolve the ambiguity. Given the single-packet measurement and the inability to use different time observations, other sets of BS can be used to form other point clouds. Finding a point common to all clouds can provide a solution to the integer ambiguity (see FIG. 4). Additionally, other constraints and cost functions can be used to select the true point between clouds.

Simulation results showing that for a typical CPP test scenario, Indoor factory (InF), the single-observation approach can only provide reliable IAR for a relatively large BW signal (approximately 100 MHz). With this BW, the initial guess is already quite accurate and IAR algorithms perform well.

However, for smaller signal BW, approximately 20-50 MHz, a single measurement is not sufficient to achieve target accuracy and even achieve 90% IAR reliability. Thus, processing based on multiple observations must be provided and multiple consecutive PRSs must be sent.

Processing multiple observations may include the following steps:

Increasing baseband estimation accuracy (Equation 1)

Increasing the accuracy of the IAR resolution in any case by discarding outlier IAR values using MSE minimization technology (see Fig. 5)

The use of both technologies can significantly increase IAR reliability for signals with lower BW.

The simulation results in Fig. 6 show the increase in productivity due to proper processing

consecutive series of PRS frames with a period of 10 ms.

It can be seen that for (a) 20 MHz, the correct IAR probability is doubled, while for (b) 50 MHz, the important 90% percentile CDF level can be achieved using the proposed processing.

According to an embodiment of the present invention, a method for combining multiple observations can be provided for carrier phase positioning in a 5G NR system.

Meanwhile, the existing 5C standard already has mechanisms for sequential PRS transmission, with these information elements of the number of repetitions (dl-PRS-ResourceRepetitionFactor-g1b) and the duration between repetitions (dl-PRS-ResourceTimeGap-g16). Here, the repetition-based mechanism included in the existing 5C standard is introduced to improve SINR and improve accuracy in case of extremely poor link conditions and long ranges. However, this repetition-based mechanism is not triggered for typically good situations where CPP is possible.

Thus, to enable repeated PRS transmissions even with good SNR, the TRP must know the PRS-related characteristics for the network (LMF, location management functions). So the specific message

regarding repetitive sequential processing must be introduced in the exchange of CPP-related messages (see FIG. 7).

(1) Notes

As explained above:

Using multiple observations improves TDoA/ToA performance.

- Higher TDoA/ToA accuracy can be expected as more observations are used.

Increased TDoA/ToA accuracy can help increase integer-based estimation.

- As a consequence, the CPP accuracy can be increased significantly, in particular for a smaller BW size.

On the contrary, the phase measurement accuracy may be difficult to improve when averaging multiple observations due to phase variation due to UE mobility.

Therefore, the phase value must be measured using a single observation.

(2) Initial data

In the existing 5C standard:

- Up to 4 observations can be used for TDoA/ToA measurement.

A "time stamp" may be reported along with the positioning measurement (eg, TDoA/ToA) to inform the LMF regarding information regarding the time synchronization with which the UE performs the positioning measurements.

The timestamp is the index of the frame/time slice in which the UE measures the PRS. One timestamp is reported even when multiple observations are used for measurement, and it is up to the UE to select a specific one from them.

The auxiliary data may be used to assist the LMF/gNB/UE with positioning-related operations. For example, they can be used by LMF to recommend to the UE a suitable number of observations for positioning measurement.

The signaling of characteristics may be used to inform the gNB/LMF regarding the characteristics for a particular UE operation. Based on the reported characteristics of the UE, the LMF/gNB can determine which feature can be used by the UE, and its associated limitation (eg, the number of observations that the UE can use for measurement)

(3) Offers

Taking into account "(1) Notes" and "(2) Input" (to improve the existing 5C standard in view of (1)):

- When the UE reports CPM along with OPM (other positioning measurements) (eg, DL-RSTD, UL-RTOA or UE/TRP Rx-Tx time difference), M>1 samples (instances) can be used for OPM, while N=1 sample (instance) is used for SRM.

- The UE may report UE characteristics to support CPP to the LMF/gNB, and it expects N=1 to be configured by default.

The UE may report UE characteristics to support measurements based on the measurement of M samples (or instances) of a set of DL-PRS resources to the LMF/gNB.

The LMF may indicate to the UE/gNB the minimum M value that is required for OPM measurement

The UE may provide ancillary data to the LMF containing the preferred M value

The LMF may provide ancillary data to the UE/gNB containing an M value recommendation.

The UE/gNB may report the actual M value that is used for the OPC measurement along with the positioning measurements in a positioning measurement message.

- When the UE reports the CPM along with the OPM, a timestamp may be reported in an identical measurement message, where the timestamp represents the point in time at which the UE measures the CPM.

In NR Rel-18 positioning, support in the UE for the ability to report CPM (carrier phase measurement) together with OPM (other positioning measurements; e.g. RSTD, RTOA or Rx-Tx time difference) is being considered for CPP

(positioning based on carrier phase).

As explained above, the OPM can be used to resolve the integer ambiguity problem, and the exact location of the UE can be estimated through the OPM.

According to the evaluation results, it should be noted that the higher the OPM accuracy, the higher the CPP accuracy.

In addition, higher OPM accuracy can be obtained as more samples are used for measurement.

In NR positioning, M=4 samples are used to obtain OPM as a baseline-based method.

Multiple samples usually guarantee high accuracy in most positioning measurements (eg, time domain positioning method).

On the contrary, the phase measurement accuracy may be difficult to improve when averaging multiple observations due to phase variation due to UE mobility.

In addition, in order to perform the double difference technique, which is useful for eliminating the initial TX/RX phase error component, the location server may need to have precise knowledge of the times at which the CPMs are performed.

Therefore, a CPM measurement with M=4 samples, such as averaging phase values estimated over 4 time points, may not be appropriate in a CPM message.

From these points of view, positioning measurement reporting methods and their associated procedures are proposed as follows:

When an Rx node reports CPM along with OPM (e.g., DL-RSTD, UL-RTOA, or UE/TRP Rx-Tx time difference), M>1 samples (instances) are used for OPM, while N=1 samples (instance ) is used for SRM.

- For example, the UE may report a DL-RSTD measurement obtained by averaging 4 samples for different time points along with a CPM obtained by 1 time point sample.

For example, the UE may report an Rx-Tx time difference measurement obtained by averaging 4 samples for different time points along with a CPM obtained by 1 time point sample.

For example, the gNB may report a UL-RTOA measurement obtained by averaging 4 samples at different time points along with a CPM obtained by 1 time point sample.

For example, the gNB may report an Rx-Tx time difference measurement obtained by averaging 4 samples at different time points along with a CPM obtained by 1 time point sample.

An Rx node may report multiple pairs of positioning measurements when generating positioning measurement messages, and each pair of positioning measurements includes one OPM and one associated CPM for the TRP (or RS-pecypca).

An Rx node may report multiple pairs of positioning measurements when generating positioning measurement messages, and each pair of positioning measurements includes one OPM and several associated CPMs for the TRP (or RS-pecypca).

Each CPM in a pair of positioning measurements is measured at a different point in time.

When the Rx node reports the CPM along with the OPM, a timestamp may be reported in each pair of positioning measurements, where the timestamp represents the instant at which the Rx node measures the CPM.

- When a pair of positioning measurements contains one CPM, one timestamp for the CPM is reported.

When a pair of positioning measurements contains multiple CPMs, a timestamp corresponding to each CPM may be reported.

To support the proposed methods, the UE may communicate characteristics that the CPP supports.

To support the proposed methods, the UE may report characteristics regarding the supported size(s) M, where M is the number of samples that can be supported for the OPM. To obtain greater accuracy than traditional methods, M>4 can be supported.

To support the proposed methods, the location server may configure the M value for the Rx node. In this case, the Rx node measures OPM using M sample observations, while the Rx node measures CPM using one sample observation.

To support the proposed methods, the location server may configure a minimum value of M that the Rx node should consider as a minimum. In this case, the Rx node measures OPM using M or more sample observations, while the Rx node measures CPM using one sample observation.

In addition to the characteristics message, the UE may request a preferred M value to the location server via ancillary data.

In addition to configuration, the location server may provide M value recommendations to the gNB/UE via assistance data.

If M is determined by the Rx node, then the Rx node may need to report the value of M, which is used for measurement in the message.

The proposed method can improve the performance in terms of CPP accuracy.

The proposed method can be advantageous when the BW size for the positioning reference signal is limited. For example, the CPP accuracy of the RedCap UE (ie, a maximum of 20 MHz is allowed in the FRl band) can be improved when the proposed method is applied.

Fig. 8 shows an example of the proposed methods.

Fig. 8(a) shows an example where the positioning measurement pairs include one OPM and one associated CPM for the TRP (or RS-pecypca). In this example, 4 time points are used to measure the OPM, and one time point is used for the associated CPM. In addition, the timestamp of the positioning measurement pair is determined by the time instant of the CPM.

Fig. 8(b) shows an example where the positioning measurement pairs include one OPM and several associated TRP (or RS-pecypca) CPMs. In this example, 4 time points are used to measure the OPM, and one time point is used for each associated OPM. In addition, the time points of each CPM are used to determine each timestamp.

Fig. 9 illustrates a method for performing positioning measurement according to an embodiment of the present invention.

Referring to FIG. 9, the UE may perform various types of positioning measurements (905). For example, the UE may perform a first type of positioning measurement that includes a carrier phase measurement (CPM), and a second type of positioning measurement that is different from the first type of measurement. Preferably, the number of times associated with the second type of measurement may be equal to or greater than the number of times for the first type of measurement.

The UE may report various types of positioning measurements (910). For example, the UE may report a first type measurement and a second type measurement.

Preferably, the first type of measurement can be performed on a single time point basis, and the second type of measurement can be performed on a multiple time point basis.

Preferably, one result obtained from a measurement of the second type may be associated with a plurality of results obtained from a measurement of the first type. Preferably, the plurality of results obtained from the first type of measurement may have a plurality of timestamp values different from each other (eg, FIG. 8(b)).

Preferably, the UE may transmit a UE characteristics message including at least one of first information regarding whether or not the UE supports a first type of measurement and second information related to the number of times supported by the UE for a second type of measurement. .

Preferably, the UE may receive third information regarding the number of times associated with the second type of measurement.

Preferably, the third information may include a minimum number of times associated with the second type of measurement.

Preferably, the UE may transmit the UE's preferred number of times associated with the second type of measurement.

Preferably, a measurement of the first type and a measurement of the second type may be included in a single measurement message.

Preferably, one measurement message may include a number of times associated with a second type of measurement.

Preferably, one measurement message may include timestamp information for the first type of measurement.

Preferably, the timestamp information for the first type of measurement may represent a point in time at which the first type of measurement is performed.

Preferably, the second type measurement may include at least one of a downlink reference time difference (DL-RSTD) measurement, an uplink relative time of arrival (UL-RTOA) measurement, or a receive time difference measurement. -transmissions.

A non-volatile medium storing instructions that instruct a processor to implement the method may

be provided according to another aspect of the present invention.

An apparatus implementing a method for performing positioning measurement may be provided according to another aspect of the present invention.

Fig. 10 illustrates a communication system 1 that may be applied to the present disclosure.

Referring to FIG. 10, the communication system 1 applied to the present disclosure includes wireless devices, a BS, and a network. A wireless device is a device that communicates using radio access technology (RAT) (such as 5G NR (or new RAT) or LTE), and is also called a “device

communication/radio/5C device." Wireless devices may include, but are not limited to, robot 100a, vehicles 100b-1 and 100b-2, extended reality (XR) device 100c, handheld device 100d, home appliance 100e , an IoT device 100f and an artificial intelligence (AI)-enabled device/server 400. For example, vehicles may include a vehicle having a wireless communication function, a vehicle capable of autonomous driving, and a vehicle enabling vehicle-to-vehicle communication ( V2V) As used herein, the vehicles may include an unmanned aerial vehicle (UAV) (e.g., a drone). An XR device may include an augmented reality (AR)/virtual reality (VR)/mixed reality style device (MR) and may be in the form of a head-mounted device (HMD), vehicle-mounted head-up display (HUD), television receiver (TV), smartphone, computer, wearable device, home appliance, digital signage system, vehicle , robot, etc. The handheld device may include a smartphone, a smart panel, a wearable device (eg, a smart watch or smart glasses), and a computer (eg, a laptop). A home appliance may include a TV, refrigerator, washing machine, etc. An IoT device may include a sensor, smart meter, etc. For example, the BS and the network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS/network node for other wireless devices.

Wireless devices 100a-100f may connect to network 300 via BS 200. AI technology may be applied to wireless devices 100a-100f, and wireless devices 100a-100f may connect to A1 server 400 via network 300. Network 300 may be configured using 3G networks, 4G (for example, LTE-) networks or 5G-(for example, NR-) networks. Although the wireless devices 100a-100f can communicate with each other via the BS 200/network 300, the wireless devices 100a-100f can communicate directly (eg, sidelink communication) with each other without BS/network intervention. For example, vehicles 100b-1 and 100b-2 may perform direct communication (eg, V2Y/vehicle-to-everything (V2X) communication). An IoT device (eg, a sensor) may communicate directly with other IoT devices (eg, sensors) or other wireless devices 100a-100f.

Wireless communication/connections 150a, 150b and 150c may be established between wireless devices 100a in 100f/BS 200 and between BS 200. Herein, wireless communication/connections may be established through various RATs (eg, 5G NR), for example, UL /DL communication 150a, sidelink communication 150b (or, 2B communication) or inter-BS communication (eg, relay or integration of access channels and inverse backhaul (IAB) technology). Wireless signals may be transmitted and received between wireless devices, between wireless devices and BSs, and between BSs via wireless communications/connections 150a, 150b, and 150c. For example, signals may be transmitted and received over various physical channels via wireless communications/connections 150a, 150b, and 150c. To this end, at least a portion of the various configuration information configuration processes, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, and resource conversion/deconversion) and resource allocation processes for transmitting/receiving wireless signals may be carried out based on various proposals of the present invention.

Fig. 11 illustrates wireless devices applicable to the present disclosure.

Referring to FIG. 11, the first wireless device 100 and the second wireless device 200 may transmit wireless signals through a plurality of RATs (eg, LTE and NR). {First wireless device 100 and second wireless device 200} may correspond to {wireless device 100x and BS 200} and/or {wireless device 100x and wireless device 100x} of FIG. 10.

The first wireless device 100 may include one or more processors 102 and one or more memories 104 and further include one or more transceivers 106 and/or one or more antennas 108. The processor(s) 102 may control the storage device(s) 104 and/or transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, sentences, methods, and/or flowcharts disclosed herein. For example, processor(s) 102 may process information in storage device(s) 104 to generate first information/signals, and then transmit wireless signals including the first information/signals through transceiver(s) 106. Processor(s) ) 102 may receive wireless signals including the second information/signals through the transceiver(s) 106 and then store the information obtained by processing the second information/signals in the storage device(s) 104. The storage device(s) 104 may be coupled to processor(s) 102 and may store various pieces of information associated with operations of processor(s) 102. For example, storage device(s) 104 may store program code including instructions for executing all or part of the processes controlled by through the processor(s) 102, or to carry out the descriptions, functions, procedures, statements, methods and/or flowcharts disclosed herein. The processors 102 and storage device(s) 104 may form part of a modem/circuit/communication chip designed to implement a RAT (eg, LTE or NR). Transceiver device(s) 106 may couple to processors 102 and transmit and/or receive wireless signals through one or more antennas 108. Each transceiver device(s) 106 may include a transmitter device and/or a receiver device. Transceiver device(s) 106 may be used interchangeably with radio frequency (RF) module(s). In the present disclosure, the wireless device may be a modem/circuit/communication chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204 and further include one or more transceivers 206 and/or one or more antennas 208. The processors 202 may control the storage device(s) ) 204 and/or transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, statements, methods, and/or flowcharts disclosed herein. For example, processors 202 may process information in storage device(s) 204 to generate third information/signals, and then transmit wireless signals including the third information/signals through transceiver(s) 206. Processors 202 may receive wireless signals including the fourth information/signals through the transceiver(s) 106 and then store the information obtained by processing the fourth information/signals in the storage device(s) 204. The storage device(s) 204 may be coupled to the processors 202 and store various pieces of information associated with the operations of the processors 202. For example, the storage device(s) 204 may store program code including instructions for executing all or a portion of the processes controlled by the processors 202, or for executing descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed in this document. The processors 202 and storage device(s) 204 may form part of a modem/circuit/communication chip designed to implement a RAT (eg, LTE or NR). Transceiver(s) 206 may couple to processors 202 and transmit and/or receive wireless signals through one or more antennas 208. Each transceiver(s) 206 may include a transmitter and/or a receiver. Transceiver device(s) 206 may be used interchangeably with RF module(s). In the present disclosure, the wireless device may be a modem/circuit/communication chip.

The hardware elements of the wireless devices 100 and 200 are described in more detail below. One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g. functional layers such as physical layer (PHY), media access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, RRC layer and service data adaptation protocol (SDAP) layer) . One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and/or one or more service data units (SDUs) according to descriptions, functions, procedures, proposals, methods and/or flowcharts method disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed herein and provide the messages, control information, data or information to one or more transceivers 106 and 206. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information, according to the descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed herein, and provide generated signals to one or more transceiver devices 106 and 206. One or more processors 102 and 202 may receive signals (eg, baseband signals) from one or more transceivers 106 and 206 and receive PDUs, SDUs, messages, control information, data or information according to descriptions, functions, procedures, proposals, methods and/or flowcharts operations of the method disclosed in this document.

One or more processors 102 and 202 may be referred to as “controllers,” “microcontrollers,” “microprocessors,” or “microcomputers.” One or more processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGA) may be included in one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed herein may be implemented using firmware or software, and firmware the software or software may be configured to include modules, procedures or functions. Firmware or software configured to execute the descriptions, functions, procedures, sentences, methods and/or flowcharts disclosed herein may be included in one or more processors 102 and 202 or may be stored in one or more more storage devices 104 and 204 and executed by one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions and/or a set of instructions.

One or more storage devices 104 and 204 may couple to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions and/or commands. One or more storage devices 104 and 204 may be configured to include read only memory (ROM), random access memory (RAM), electrically erasable programmable read only memory (EPROM), flash memory, hard disks, registers, cache -memory, computer-readable storage media and/or combinations of the above. One or more storage devices 104 and 204 may be located internally and/or externally to one or more processors 102 and 202. One or more storage devices 104 and 204 may be coupled to one or more processors 102 and 202 through various technologies, for example, via wired or wireless connection.

One or more transceiver devices 106 and 206 may transmit user data, control information, and/or wireless signals/channels mentioned in the methods and/or flowcharts of this document to one or more other devices. One or more transceiver devices 106 and 206 may receive user data, control information and/or wireless signals/channels mentioned in the descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed herein. from one or more other devices. For example, one or more transceiver devices 106 and 206 may couple to one or more processors 102 and 202 and transmit and receive wireless signals. For example, one or more processors 102 and 202 may perform control such that one or more transceiver devices 106 and 206 may transmit user data, control information, or wireless signals to one or more other devices. One or more processors 102 and 202 may perform control such that one or more transceiver devices 106 and 206 may receive user data, control information, or wireless signals from one or more other devices. One or more transceiver devices 106 and 206 may be coupled to one or more antennas 108 and 208, and one or more transceiver devices 106 and 206 may be configured to transmit and receive user data, control information, and/or wireless signals. /channels mentioned in the descriptions, functions, procedures, proposals, methods and/or flowcharts disclosed herein, through one or more antennas 108 and 208. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). One or more transceiver devices 106 and 206 may convert received wireless signals/channels from RF frequency band signals to baseband signals to process received user data, control information, and wireless signals/channels using one or more processors 102 and 202. One or more transceiver devices 106 and 206 may convert user data, control information, and wireless signals/channels processed using one or more processors 102 and 202 from baseband signals to RF frequency band signals. To this end, one or more transceiver devices 106 and 206 may include (analog) oscillators and/or filters.

The embodiments of the present invention described above are combinations of elements and features of the present invention. Elements or attributes may be considered selective unless otherwise noted. Each element or feature may be practiced without being combined with other elements or features. Additionally, an embodiment of the present invention can be constructed by combining parts of elements and/or features. The order of operations described in the embodiments of the present invention may be rearranged. Certain structures of any embodiment may be included in another embodiment and may be replaced by corresponding structures of the other embodiment. It will be apparent to those skilled in the art that claims that are not expressly set forth in combination with each other in the appended claims may be presented in combination as an embodiment of the present invention, or may be included as a new claim by virtue of a subsequent amendment thereafter. how the application was submitted.

Embodiments of the present invention are described above, focusing on the relationship of signal transmission and reception between the UE and the BS. The signaling relationship is extended to the transmission and reception of signals between a UE and a relay or between a BS and a relay in an identical or similar manner. The specific operation described as being performed by the BS may be performed by the upper node BS. Namely, it is obvious that in a network consisting of a plurality of network nodes including a BS, various operations performed for communication with a UE may be performed by the BS or network nodes other than the BS. The term "BS" may be replaced by the term "fixed station", "node B", "evolved node B" ("eNB"), "access point", etc. Additionally, the term "UE" may be replaced by the term "terminal", "mobile station (MS)", "mobile subscriber station (MSS)", etc.

Those skilled in the art will appreciate that the present invention may be practiced in specific ways other than those set forth herein without departing from the spirit and essential characteristics of the present invention. As such, the above embodiments are to be considered in all aspects as illustrative and not restrictive. The scope of the invention is to be determined by the appended claims and their permissible equivalents, rather than by the foregoing description, and all modifications falling within the scope and range of equivalence of the appended claims are included therein.

Industrial applicability

The present invention can be used in a UE, BS or other devices in a wireless communication system.

Claims (31)

1. A method for performing a measurement for positioning by a user equipment (UE) in a wireless communication system, the method comprising the steps of: performing a first type measurement for positioning, including a carrier phase measurement (CPM); performing a second type of positioning measurement that is different from the first type of measurement; And generate messages on measurements of the first type and measurements of the second type, in this case, the number of time points associated with a measurement of the second type is equal to or greater than the number of time points for a measurement of the first type. 2. The method of claim 1, wherein one result obtained from a measurement of the second type is associated with a plurality of results obtained from a measurement of the first type, and wherein a plurality of results obtained from a measurement of the first type have a plurality of timestamp values that differ from each other. 3. The method according to claim 1, in which the measurement of the first type is performed once for one point in time, and the measurement of the second type is performed repeatedly for several points in time. 4. The method according to claim 1, further comprising the step of: transmitting a UE characteristics message including at least one of first information regarding whether or not the UE supports a first type of measurement, and second information related to the number of times supported by the UE for a second type of measurement. 5. The method according to claim 1, further comprising the step of: receiving third information regarding the number of times associated with the second type of measurement. 6. The method of claim 5, wherein the third information includes a minimum number of times associated with the second type of measurement. 7. The method according to claim 1, further comprising the step of: transmitting the UE's preferred number of times associated with the second type of measurement. 8. The method of claim 1, wherein the first type measurement and the second type measurement are communicated through a single measurement message. 9. The method of claim 8, wherein the one measurement message includes a number of times associated with the second type of measurement. 10. The method of claim 8, wherein the one measurement message includes timestamp information for the first type of measurement. 11. The method of claim 10, wherein the timestamp information for the first type of measurement represents a point in time at which the first type of measurement is performed. 12. The method of claim 1, wherein the second type measurement includes at least one of a downlink reference time difference (DL-RSTD), an uplink relative arrival time (UL- RTOA) or round trip time difference measurements. 13. A non-volatile medium storing instructions that instruct the processor to carry out the method of claim 1. 14. A device for wireless communication, the device comprising: a storage device configured to store instructions; And a processor configured to perform operations by executing instructions, the operations performed by the processor include: performing a first type of measurement for positioning, including a carrier phase measurement (CPM); performing a second type of measurement for positioning that is different from the first type of measurement; And generation of messages on measurements of the first type and measurements of the second type, in this case, the number of time points associated with a measurement of the second type is equal to or greater than the number of time points for a measurement of the first type. 15. The device according to claim 14, additionally containing: a transceiver device, wherein the device is a user equipment (UE) operating in a wireless communication system.