# US 2025/0168802 A1 · Position estimation based on non-reciprocity source information

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- Number: US 2025/0168802 A1
- Document ID: US20250168802A1
- Status: Published application
- Kind: A1
- Application number: 18/513,035
- Filed: 2023-11-17
- Published: 2025-05-22
- Earliest claimed: 2023-11-17
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Sourjya DUTTA; Navid ABEDINI; Kapil GULATI
- Web page: https://patentgrep.com/patent/US20250168802A1

## CPC

- G01S 5/0236: {Assistance data, e.g. base station almanac}
- H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management
- G01S 5/0036: {of measured values, i.e. measurement on mobile and position calculation on base station}
- G01S 5/0205: {Details}
- G01S 7/006: {using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence)}
- G01S 13/765: {with exchange of information between interrogator and responder}
- H04B 17/328: {Reference signal received power [RSRP]; Reference signal received quality [RSRQ]}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- 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
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Disclosed are techniques for wireless communication. In an aspect, a position estimation entity receives measurement reports that indicate a non-reciprocity condition between link directions (e.g., as part of a multi-round trip time (RTT) position estimation session). In an aspect, the position estimation entity transmits request(s) to retrieve non-reciprocity source information, which may be used in position estimation derivation (e.g., to correct for error due to the non-reciprocity). In an aspect, the request(s) may be transmitted to a target UE and/or a wireless node involved in the position estimation session (e.g., serving gNB or TRP, another UE, etc.).

## Claims

### Claim 1

A method of operating a position estimation entity, comprising:
receiving a first measurement report associated with a position estimation procedure of a user equipment (UE), the first measurement report comprising measurement information associated with one or more measurements of a first positioning reference signal (PRS) communicated on a first link direction from a wireless node to a user equipment (UE);
receiving a second measurement report associated with the position estimation procedure of the UE, the second measurement report comprising measurement information associated with one or more measurements of a second PRS communicated on a second link direction from the UE to the wireless node;
determining a non-reciprocity condition between the first link direction and the second link direction;
transmitting at least one additional location information request that requests non-reciprocity source information associated with the first link direction, the second link direction, or both, in response to the determination of the non-reciprocity condition;
receiving at least one response comprising the non-reciprocity source information in response to the at least one additional location information request; and
deriving a position estimate of the UE based on the first measurement report, the second measurement report, and the non-reciprocity source information of the at least one response.

### Claim 2 (depends on 1)

The method of claim 1, wherein the position estimation procedure is a multi-round trip time (RTT) position estimation procedure.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the wireless node is a wireless network component, the first link direction is a downlink direction and the second link direction is an uplink direction, or
wherein the wireless node is another UE, the first link direction is a first sidelink direction, and the second link direction is a second sidelink direction.

### Claim 4 (depends on 1)

The method of claim 1, wherein the determination of the non-reciprocity condition is based on:
one or more reconfigurable intelligent devices (RIDs) being camped on a serving cell of the UE, or
an explicit indication in the first measurement report that indicates the use of at least one UE-controlled RID associated with the communication of the second PRS, or
a measurement differential between the first measurement report and the second measurement report, or
a timing differential between a round trip time (RTT) computed based on the first measurement report and the second measurement report and a previous computed timing measurement between the UE and the wireless node, or
any combination thereof.

### Claim 5 (depends on 1)

The method of claim 1, wherein the at least one additional location information request comprises a first additional location information request that is transmitted to the UE.

### Claim 6 (depends on 5)

The method of claim 5,
wherein the first additional location information request is configured to request information on any reconfigurable intelligent device (RID) used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the at least one response comprises a first response from the UE in response to the first additional location information request, and the at least one response comprises an indication of whether any reconfigurable intelligent device (RID) is used for reception of the first PRS, transmission of the second PRS, or both.

### Claim 7 (depends on 6)

The method of claim 6,
wherein the indication indicates that no UE-controlled RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the indication indicates that at least one RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the first response indicates whether the at least one RID is UE-controlled, or
wherein the first response indicates at least one identifier associated with the at least one RID, or
wherein the first response comprises first information associated with a first ranging or timing estimation procedure between the UE and the at least one RID, or
wherein the first response comprises second information associated with a first ranging or timing estimation procedure between the UE and at least one wireless node associated with the position estimation procedure, or
any combination thereof.

### Claim 8 (depends on 7)

The method of claim 7,
wherein the first response comprises the second information, and
wherein the second information comprises:
distance information between the at least one RID and the UE, or
RID-specific timing error information, or
first RID-specific path loss information for a link direction associated with at least one RID in an active state, or
second RID-specific link path loss information for a link direction associated with the at least one RID in an inactive state, or
first RID-specific reference signal received power (RSRP) information associated with the at least one RID in the active state, or
second RID-specific RSRP information associated with the at least one RID in the inactive state
any combination thereof.

### Claim 9 (depends on 8)

The method of claim 8, further comprising:
transmitting, to the at least one wireless node associated with the position estimation procedure, a request for the at least one wireless node to allocate one or more resources to the UE to determine the first information, the second information, or both,
wherein the first information, the second information, or both are included in the first response based on the allocated one or more resources.

### Claim 10 (depends on 9)

The method of claim 9, wherein the allocated one or more resources are associated with one or more uplink reference signals, one or more downlink reference signals, one or more sidelink reference signals, or any combination thereof.

### Claim 11 (depends on 5)

The method of claim 5, wherein the at least one additional location information request comprises a second additional location information request that is transmitted to at least one wireless node associated with the position estimation procedure.

### Claim 12 (depends on 11)

The method of claim 11, wherein the at least one additional location information request is configured to request:
information on any known RID on the first link direction, the second link direction, or both, or
information on one or more UE-controlled RIDs indicated in the first response, or
a paging procedure between the UE and the one or more UE-controlled RIDs indicated in the first response, or
any combination thereof.

### Claim 13 (depends on 5)

The method of claim 5, wherein the first additional location information request comprises a reason field indicating non-reciprocity.

### Claim 14

A method of operating a user equipment (UE), comprising:
performing one or more measurements associated with a first positioning reference signal (PRS) communicated on a first link direction from a wireless node to the UE;
transmitting a second PRS on a second link direction to at least one wireless node;
transmitting a measurement report associated with a position estimation procedure of the UE to a position estimation entity, the measurement report comprising measurement information associated with the one or more measurements of the first PRS;
receiving, from the position estimation entity, an additional location information request that requests non-reciprocity source information associated with the first link direction, the second link direction, or both;
determining whether any non-reciprocity source information associated with the first link direction, the second link direction, or both, is available in response to the additional location information request; and
transmitting a response to the additional location information request based on the determination.

### Claim 15 (depends on 14)

The method of claim 14,
wherein the position estimation procedure is a multi-round trip time (RTT) position estimation procedure, or
wherein the wireless node is a wireless network component, the first link direction is a downlink link direction and the second link direction is an uplink link direction, or
wherein the wireless node is another UE, the first link direction is a first sidelink link direction, and the second link direction is a second sidelink link direction, or
wherein the first additional location information request is configured to request information on any reconfigurable intelligent device (RID) used for reception of the first PRS, transmission of the second PRS, or both.

### Claim 16 (depends on 15)

The method of claim 15,
wherein response comprises an indication of whether any reconfigurable intelligent device (RID) is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the indication indicates that no UE-controlled RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the indication indicates that at least one RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the response indicates whether the at least one RID is UE-controlled, or
wherein the response indicates at least one identifier associated with the at least one RID, or
wherein the response comprises first information associated with a first ranging or timing estimation procedure between the UE and the at least one RID, or
wherein the response comprises second information associated with a first ranging or timing estimation procedure between the UE and at least one wireless node associated with the position estimation procedure, or
any combination thereof.

### Claim 17 (depends on 16)

The method of claim 16,
wherein the response comprises the second information, and
wherein the second information comprises:
distance information between the at least one RID and the UE, or
RID-specific timing error information, or
RID-specific path loss information for a link direction, or
RID-specific reference signal received power (RSRP) information, or
any combination thereof.

### Claim 18 (depends on 14)

The method of claim 14, wherein the additional location information request comprises a reason field indicating non-reciprocity.

### Claim 19

A method of operating a wireless node, comprising:
transmitting a first positioning reference signal (PRS) to a user equipment (UE) on a first link direction from the wireless node to the UE;
performing one or more measurements associated with a second PRS communicated on a second link direction from the UE to the wireless node;
transmitting a measurement report associated with a position estimation procedure of the UE to a position estimation entity, the measurement report comprising measurement information associated with the one or more measurements of the second PRS;
receiving, from the position estimation entity, an additional location information request that requests non-reciprocity source information associated with the first link direction, the second link direction, or both;
determining whether any non-reciprocity source information associated with the first link direction, the second link direction, or both, is available in response to the additional location information request; and
transmitting a response to the additional location information request based on the determination.

### Claim 20 (depends on 19)

The method of claim 19, further comprising:
allocating one or more resources to the UE in response to the additional location information request to facilitate:
a first ranging or timing estimation procedure between the UE and the at least one RID, or
a first ranging or timing estimation procedure between the UE and the wireless node, or
a combination thereof.

### Claim 21

A position estimation entity, comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
receive, via the one or more transceivers, a first measurement report associated with a position estimation procedure of a user equipment (UE), the first measurement report comprising measurement information associated with one or more measurements of a first positioning reference signal (PRS) communicated on a first link direction from a wireless node to a user equipment (UE);
receive, via the one or more transceivers, a second measurement report associated with the position estimation procedure of the UE, the second measurement report comprising measurement information associated with one or more measurements of a second PRS communicated on a second link direction from the UE to the wireless node;
determine a non-reciprocity condition between the first link direction and the second link direction;
transmit, via the one or more transceivers, at least one additional location information request that requests non-reciprocity source information associated with the first link direction, the second link direction, or both, in response to the determination of the non-reciprocity condition;
receive, via the one or more transceivers, at least one response comprising the non-reciprocity source information in response to the at least one additional location information request; and
derive a position estimate of the UE based on the first measurement report, the second measurement report, and the non-reciprocity source information of the at least one response.

### Claim 22 (depends on 21)

The position estimation entity of claim 21, wherein the position estimation procedure is a multi-round trip time (RTT) position estimation procedure.

### Claim 23 (depends on 21)

The position estimation entity of claim 21,
wherein the wireless node is a wireless network component, the first link direction is a downlink direction and the second link direction is an uplink direction, or
wherein the wireless node is another UE, the first link direction is a first sidelink direction, and the second link direction is a second sidelink direction.

### Claim 24 (depends on 21)

The position estimation entity of claim 21, wherein the determination of the non-reciprocity condition is based on:
one or more reconfigurable intelligent devices (RIDs) being camped on a serving cell of the UE, or
an explicit indication in the first measurement report that indicates the use of at least one UE-controlled RID associated with the communication of the second PRS, or
a measurement differential between the first measurement report and the second measurement report, or
a timing differential between a round trip time (RTT) computed based on the first measurement report and the second measurement report and a previous computed timing measurement between the UE and the wireless node, or
any combination thereof.

### Claim 25 (depends on 21)

The position estimation entity of claim 21, wherein the at least one additional location information request comprises a first additional location information request that is transmitted to the UE.

### Claim 26 (depends on 25)

The position estimation entity of claim 25,
wherein the first additional location information request is configured to request information on any reconfigurable intelligent device (RID) used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the at least one response comprises a first response from the UE in response to the first additional location information request, and the at least one response comprises an indication of whether any reconfigurable intelligent device (RID) is used for reception of the first PRS, transmission of the second PRS, or both.

### Claim 27 (depends on 26)

The position estimation entity of claim 26,
wherein the indication indicates that no UE-controlled RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the indication indicates that at least one RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the first response indicates whether the at least one RID is UE-controlled, or
wherein the first response indicates at least one identifier associated with the at least one RID, or
wherein the first response comprises first information associated with a first ranging or timing estimation procedure between the UE and the at least one RID, or
wherein the first response comprises second information associated with a first ranging or timing estimation procedure between the UE and at least one wireless node associated with the position estimation procedure, or
any combination thereof.

### Claim 28 (depends on 27)

The position estimation entity of claim 27,
wherein the first response comprises the second information, and
wherein the second information comprises:
distance information between the at least one RID and the UE, or
RID-specific timing error information, or
first RID-specific path loss information for a link direction associated with at least one RID in an active state, or
second RID-specific link path loss information for a link direction associated with the at least one RID in an inactive state, or
first RID-specific reference signal received power (RSRP) information associated with the at least one RID in the active state, or
second RID-specific RSRP information associated with the at least one RID in the inactive state
any combination thereof.

### Claim 29 (depends on 28)

The position estimation entity of claim 28, wherein the one or more processors, either alone or in combination, are further configured to:
transmit, via the one or more transceivers, to the at least one wireless node associated with the position estimation procedure, a request for the at least one wireless node to allocate one or more resources to the UE to determine the first information, the second information, or both,
wherein the first information, the second information, or both are included in the first response based on the allocated one or more resources.

### Claim 30 (depends on 29)

The position estimation entity of claim 29, wherein the allocated one or more resources are associated with one or more uplink reference signals, one or more downlink reference signals, one or more sidelink reference signals, or any combination thereof.

### Claim 31 (depends on 25)

The position estimation entity of claim 25, wherein the at least one additional location information request comprises a second additional location information request that is transmitted to at least one wireless node associated with the position estimation procedure.

### Claim 32 (depends on 31)

The position estimation entity of claim 31, wherein the at least one additional location information request is configured to request:
information on any known RID on the first link direction, the second link direction, or both, or
information on one or more UE-controlled RIDs indicated in the first response, or
a paging procedure between the UE and the one or more UE-controlled RIDs indicated in the first response, or
any combination thereof.

### Claim 33 (depends on 25)

The position estimation entity of claim 25, wherein the first additional location information request comprises a reason field indicating non-reciprocity.

### Claim 34

A user equipment (UE), comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
perform one or more measurements associated with a first positioning reference signal (PRS) communicated on a first link direction from a wireless node to the UE;
transmit, via the one or more transceivers, a second PRS on a second link direction to at least one wireless node;
transmit, via the one or more transceivers, a measurement report associated with a position estimation procedure of the UE to a position estimation entity, the measurement report comprising measurement information associated with the one or more measurements of the first PRS;
receive, via the one or more transceivers, from the position estimation entity, an additional location information request that requests non-reciprocity source information associated with the first link direction, the second link direction, or both;
determine whether any non-reciprocity source information associated with the first link direction, the second link direction, or both, is available in response to the additional location information request; and
transmit, via the one or more transceivers, a response to the additional location information request based on the determination.

### Claim 35 (depends on 34)

The UE of claim 34,
wherein the position estimation procedure is a multi-round trip time (RTT) position estimation procedure, or
wherein the wireless node is a wireless network component, the first link direction is a downlink link direction and the second link direction is an uplink link direction, or
wherein the wireless node is another UE, the first link direction is a first sidelink link direction, and the second link direction is a second sidelink link direction, or
wherein the first additional location information request is configured to request information on any reconfigurable intelligent device (RID) used for reception of the first PRS, transmission of the second PRS, or both.

### Claim 36 (depends on 35)

The UE of claim 35,
wherein, to, the one or more processors, either alone or in combination, are configured to an indication of whether any reconfigurable intelligent device (RID) is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the indication indicates that no UE-controlled RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the indication indicates that at least one RID is used for reception of the first PRS, transmission of the second PRS, or both, or
wherein the response indicates whether the at least one RID is UE-controlled, or wherein the response indicates at least one identifier associated with the at least one RID, or
wherein the response comprises first information associated with a first ranging or timing estimation procedure between the UE and the at least one RID, or
wherein the response comprises second information associated with a first ranging or timing estimation procedure between the UE and at least one wireless node associated with the position estimation procedure, or
any combination thereof.

### Claim 37 (depends on 36)

The UE of claim 36,
wherein the response comprises the second information, and
wherein the second information comprises:
distance information between the at least one RID and the UE, or
RID-specific timing error information, or
RID-specific path loss information for a link direction, or
RID-specific reference signal received power (RSRP) information, or
any combination thereof.

### Claim 38 (depends on 34)

The UE of claim 34, wherein the additional location information request comprises a reason field indicating non-reciprocity.

### Claim 39

A wireless node, comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
transmit, via the one or more transceivers, a first positioning reference signal (PRS) to a user equipment (UE) on a first link direction from the wireless node to the UE;
perform one or more measurements associated with a second PRS communicated on a second link direction from the UE to the wireless node;
transmit, via the one or more transceivers, a measurement report associated with a position estimation procedure of the UE to a position estimation entity, the measurement report comprising measurement information associated with the one or more measurements of the second PRS;
receive, via the one or more transceivers, from the position estimation entity, an additional location information request that requests non-reciprocity source information associated with the first link direction, the second link direction, or both;
determine whether any non-reciprocity source information associated with the first link direction, the second link direction, or both, is available in response to the additional location information request; and
transmit, via the one or more transceivers, a response to the additional location information request based on the determination.

### Claim 40 (depends on 39)

The wireless node of claim 39, wherein the one or more processors, either alone or in combination, are further configured to:
allocate one or more resources to the UE in response to the additional location information request to facilitate:
a first ranging or timing estimation procedure between the UE and the at least one RID, or
a first ranging or timing estimation procedure between the UE and the wireless node, or
a combination thereof.