# US 11,451,428 B2 · Configurable reference signal time difference measurement (RSTD) search window

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- Number: US 11,451,428 B2
- Document ID: US11451428B2
- Status: Granted
- Kind: B2
- Application number: 16/739,067
- Filed: 2020-01-09
- Published: 2020-07-16
- Granted: 2022-09-20
- Earliest claimed: 2019-01-11
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Alexandros Manolakos; Sony Akkarakaran; Sven Fischer; Guttorm Ringstad Opshaug
- Web page: https://patentgrep.com/patent/US11451428B2

## CPC

- G01S 5/10: Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements {, e.g. omega or decca systems}(G01S5/12 takes precedence {; beacons and receivers cooperating therewith G01S1/306, G01S1/308})
- G01S 1/0428: {Signal details}
- G01S 5/0045: {Transmission from base station to mobile station (G01S5/009 takes precedence)}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/266: {Fine or fractional frequency offset determination and synchronisation}
- H04L 27/2665: {Fine synchronisation, e.g. by positioning the FFT window}
- H04L 27/2675: {Pilot or known symbols}
- 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 13/74: Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S 13/76: wherein pulse-type signals are transmitted
- G01S 2205/01: specially adapted for specific applications
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- 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
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Disclosed are methods and apparatuses for providing configurable reference signal timing difference (RSTD) search windows for positioning. In an aspect, an RSTD search window is configured based on a positioning reference signal (PRS) configuration. The RSTD search window is provided to the UE. A plurality of PRS is transmitted from a network entity to a user equipment (UE), each PRS having the PRS configuration. The plurality of PRS are transmitted in a subset that is less than all subcarriers over a given bandwidth.

## Claims

### Claim 1

A method of operating a network entity, comprising:
obtaining a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD is search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
providing the RSTD search window to a user equipment (UE); and
transmitting a plurality of PRS defined by the PRS configuration to the UE, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 2 (depends on 1)

The method of claim 1, wherein the allowable range for a comb-N PRS configuration is greater than the allowable range for a comb-M PRS configuration, and wherein N is less than M.

### Claim 3 (depends on 2)

The method of claim 2, wherein N is greater than 1.

### Claim 4 (depends on 1)

The method of claim 1, wherein the allowable range is inversely proportional to a comb-N PRS configuration without frequency staggering.

### Claim 5 (depends on 1)

The method of claim 1, wherein the allowable range is on an order of nanoseconds (ns).

### Claim 6 (depends on 1)

The method of claim 1, wherein the allowable range is based on a numerology of the PRS configuration.

### Claim 7 (depends on 6)

The method of claim 6, wherein the allowable range is not greater than T·1000/(14·N) ns, where T is a slot size in microseconds (μs), and wherein the PRS configuration is of comb-N.

### Claim 8 (depends on 1)

The method of claim 1, wherein obtaining the RSTD search window based on the PRS configuration comprises:
obtaining a different RSTD search window for each frequency range associated with the PRS configuration.

### Claim 9 (depends on 1)

The method of claim 1, wherein a resolution value for the RSTD search window is K·Tc·2n, where Tc=1/(480,000·4096) and wherein K={1, 2, 3} and u={1, 2, 3, 4, 5, 6}.

### Claim 10 (depends on 9)

The method of claim 9, wherein selected values of K or u are based on a numerology of the PRS configuration.

### Claim 11 (depends on 10)

The method of claim 10, wherein K=3 and u=6 based on the numerology having a 15 kilohertz (kHz) subcarrier spacing.

### Claim 12 (depends on 10)

The method of claim 10, wherein K is selected from integers 1, 2, or 3 with u less than 6 for any numerology having a subcarrier spacing greater than 15 kHz.

### Claim 13 (depends on 9)

The method of claim 9, wherein selected values of K or u are configured.

### Claim 14 (depends on 9)

The method of claim 9, wherein the expected RSTD parameter is encoded using 14 bits with a granularity 3·Tc·2μ1, where u1={1, 2, 3, 4, 5, 6} and Tc is 0.509 nanoseconds.

### Claim 15 (depends on 9)

The method of claim 9, wherein the RSTD uncertainty parameter is encoded using 10 bits with a granularity 3·Tc·2μ2, where u2={1, 2, 3, 4, 5, 6} and Tc is 0.509 nanoseconds.

### Claim 16 (depends on 15)

The method of claim 15, wherein u1 and u2 are different.

### Claim 17 (depends on 1)

The method of claim 1, wherein providing the RSTD search window further comprises:
configuring multiple RSTD search windows with multiple allowable ranges; and
providing the multiple RSTD search windows with the multiple allowable ranges to the UE.

### Claim 18 (depends on 17)

The method of claim 17, wherein at least one of the multiple RSTD search windows is associated with a resolution.

### Claim 19 (depends on 17)

The method of claim 17, further comprising:
signaling to the UE which one of the multiple RSTD search windows to apply to a PRS configuration, a PRS occasion, a PRS instance, or a PRS occasion group.

### Claim 20 (depends on 19)

The method of claim 19, wherein the UE is signaled using downlink control information (DCI) or medium access control (MAC) control element (CE).

### Claim 21 (depends on 17)

The method of claim 17, further comprising:
receiving a report from the UE reporting RSTDs determined for the multiple RSTD search windows.

### Claim 22 (depends on 17)

The method of claim 17, wherein a different RSTD search window of the multiple RSTD search windows is configured for each frequency band on which the UE is expected to measure the plurality of PRS.

### Claim 23 (depends on 17)

The method of claim 17, wherein a different RSTD search window of the multiple RSTD search windows is configured for each frequency range in which the UE is expected to measure the plurality of PRS.

### Claim 24 (depends on 1)

The method of claim 1, wherein the PRS configuration is aperiodic PRS or semi-persistent PRS.

### Claim 25 (depends on 1)

The method of claim 1, further comprising:
obtaining a position estimate of the UE, wherein an accuracy of the position estimate is less than aliasing repetitions produced by a comb-N PRS configuration.

### Claim 26 (depends on 25)

The method of claim 25, wherein the position estimate of the UE is obtained while tracking the UE.

### Claim 27 (depends on 1)

The method of claim 1, wherein the network entity is insufficiently synchronized with a serving base station of the UE, and wherein the RSTD search window is referenced to an alternate base station to which the network entity is sufficiently synchronized.

### Claim 28 (depends on 27)

The method of claim 27, wherein the UE is configured to perform a physical random access channel (PRACH) procedure with the alternate base station.

### Claim 29 (depends on 1)

The method of claim 1, wherein the network entity is a base station.

### Claim 30 (depends on 29)

The method of claim 29, wherein the obtaining comprises receiving the RSTD search window from a location server.

### Claim 31 (depends on 29)

The method of claim 29, wherein the obtaining comprises configuring the RSTD search window at the base station.

### Claim 32 (depends on 1)

The method of claim 1, wherein the RSTD search window is provided as part of downlink positioning reference signal assistance information, and
wherein a size of the RSTD search window is provided in the downlink positioning reference signal assistance information as a number of one or more orthogonal frequency division multiplexing (OFDM) symbols.

### Claim 33 (depends on 32)

The method of claim 32, wherein the number of the one or more OFDM symbols is based on a frequency range in which the UE is expected to measure the plurality of PRS.

### Claim 34 (depends on 32)

The method of claim 32, wherein each of a search window offsets per cell per occasion parameter, a search window size per cell per occasion, and a full search range for all cells per positioning session parameter are represented by a number of one or more OFDM symbols.

### Claim 35 (depends on 1)

The method of claim 1, wherein:
the frequency range of the plurality of PRS is Frequency Range 1 (FR1), and a value of the RSTD uncertainty parameter is +/−32 microseconds.

### Claim 36 (depends on 1)

The method of claim 1, wherein:
the frequency range of the plurality of PRS is Frequency Range 2 (FR2), and a value of the RSTD uncertainty parameter is +/−8 microseconds.

### Claim 37

A method of operating a user equipment (UE), comprising:
receiving a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
receiving a plurality of PRS defined by the PRS configuration from a network node, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth; and
determining an RSTD between the network node and a reference node based on the RSTD search window.

### Claim 38 (depends on 37)

The method of claim 37, wherein the allowable range for a comb-N PRS configuration is greater than the allowable range for a comb-M PRS configuration, and wherein N is less than M.

### Claim 39 (depends on 38)

The method of claim 38, wherein N is greater than 1.

### Claim 40 (depends on 37)

The method of claim 37, wherein the allowable range is inversely proportional to a comb-N PRS configuration without frequency staggering.

### Claim 41 (depends on 37)

The method of claim 37, wherein the allowable range is on an order of nanoseconds (ns).

### Claim 42 (depends on 37)

The method of claim 37, wherein the allowable range is based on a numerology of the PRS configuration.

### Claim 43 (depends on 42)

The method of claim 42, wherein the allowable range is not greater than T·1000/(14·N) ns, where T is a slot size in microseconds (μs), and wherein the PRS configuration is of comb-N.

### Claim 44 (depends on 37)

The method of claim 37, wherein a different RSTD search window is determined for each frequency range associated with the PRS configuration.

### Claim 45 (depends on 37)

The method of claim 37, wherein a resolution value for the RSTD search window is K·Tc·2u, where Tc=1/(480,000·4096) and wherein K={1, 2, 3} and u={1, 2, 3, 4, 5, 6}.

### Claim 46 (depends on 45)

The method of claim 45, wherein selected values of K or u are based on a numerology of the PRS configuration.

### Claim 47 (depends on 46)

The method of claim 46, wherein K=3 and u=6 based on the numerology having a 15 kilohertz (kHz) subcarrier spacing.

### Claim 48 (depends on 46)

The method of claim 46, wherein K is selected from integers 1, 2, or 3 with u less than 6 for any numerology having a subcarrier spacing greater than 15 kHz.

### Claim 49 (depends on 45)

The method of claim 45, wherein selected values of K or u are configured.

### Claim 50 (depends on 45)

The method of claim 45, wherein the expected RSTD parameter is encoded using 14 bits with a granularity 3·Tc·2μ1, where u1={1, 2, 3, 4, 5, 6} and Tc is 0.509 nanoseconds.

### Claim 51 (depends on 45)

The method of claim 45, wherein the RSTD uncertainty parameter is encoded using 10 bits with a granularity 3·Tc·2μ2, where u2={1, 2, 3, 4, 5, 6} and Tc is 0.509 nanoseconds.

### Claim 52 (depends on 51)

The method of claim 51, wherein u1 and u2 are different.

### Claim 53 (depends on 37)

The method of claim 37, wherein receiving the RSTD search window further comprises:
receiving multiple RSTD search windows with multiple allowable ranges.

### Claim 54 (depends on 53)

The method of claim 53, wherein at least one of the multiple RSTD search windows is associated with a resolution.

### Claim 55 (depends on 53)

The method of claim 53, further comprising:
receiving which one of the multiple RSTD search windows to apply to a PRS configuration, a PRS occasion, a PRS instance, or a PRS occasion group.

### Claim 56 (depends on 55)

The method of claim 55, wherein the UE is signaled using downlink control information (DCI) or medium access control (MAC) control element (CE).

### Claim 57 (depends on 53)

The method of claim 53, further comprising:
transmitting a report to the network node reporting RSTDs determined for the multiple RSTD search windows.

### Claim 58 (depends on 53)

The method of claim 53, wherein a different RSTD search window of the multiple RSTD search windows is configured for each frequency band on which the UE is expected to measure the plurality of PRS.

### Claim 59 (depends on 53)

The method of claim 53, wherein a different RSTD search window of the multiple RSTD search windows is configured for each frequency range in which the UE is expected to measure the plurality of PRS.

### Claim 60 (depends on 37)

The method of claim 37, wherein the PRS configuration is aperiodic PRS or semi-persistent PRS.

### Claim 61 (depends on 37)

The method of claim 37, wherein the network node is insufficiently synchronized with a serving base station of the UE, and wherein the RSTD search window is referenced to an alternate base station to which the network node is sufficiently synchronized.

### Claim 62 (depends on 61)

The method of claim 61, further comprising performing a physical random access channel (PRACH) procedure with the alternate base station.

### Claim 63 (depends on 37)

The method of claim 37, wherein the network node is a base station.

### Claim 64 (depends on 63)

The method of claim 63, wherein the receiving comprises receiving the RSTD search window from a location server via the base station.

### Claim 65 (depends on 37)

The method of claim 37, wherein the RSTD search window is received as part of downlink positioning reference signal assistance information, and
wherein a size of the RSTD search window is received in the downlink positioning reference signal assistance information as a number of one or more orthogonal frequency division multiplexing (OFDM) symbols.

### Claim 66 (depends on 65)

The method of claim 65, wherein the number of the one or more OFDM symbols is based on a frequency range in which the UE is expected to measure the plurality of PRS.

### Claim 67 (depends on 65)

The method of claim 65, wherein each of a search window offsets per cell per occasion parameter, a search window size per cell per occasion, and a full search range for all cells per positioning session parameter are represented by a number of one or more OFDM symbols.

### Claim 68 (depends on 37)

The method of claim 37, further comprising:
reporting the RSTD to a network entity.

### Claim 69 (depends on 68)

The method of claim 68, wherein the network entity is a base station or a location server.

### Claim 70 (depends on 37)

The method of claim 37, further comprising:
determining a location of the UE, at the UE, using the RSTD.

### Claim 71 (depends on 37)

The method of claim 37, wherein the network node and the reference node are each one of a base station, access point, or transmission points belonging to a same base station.

### Claim 72 (depends on 37)

The method of claim 37, wherein:
the frequency range of the plurality of PRS is Frequency Range 1 (FR1), and a value of the RSTD uncertainty parameter is +/−32 microseconds.

### Claim 73 (depends on 37)

The method of claim 37, wherein:
the frequency range of the plurality of PRS is Frequency Range 2 (FR2), and a value of the RSTD uncertainty parameter is +/−8 microseconds.

### Claim 74

A method of operating a location server, comprising:
determining a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
providing the RSTD search window to a user equipment (UE) via a base station serving the UE; and
configuring a plurality of PRS defined by the PRS configuration to be transmitted to the UE, wherein the plurality of PRS is to be transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 75 (depends on 74)

The method of claim 74, wherein the allowable range for a comb-N PRS configuration is greater than the allowable range for a comb-M PRS configuration, and wherein N is less than M.

### Claim 76 (depends on 75)

The method of claim 75, wherein N is greater than 1.

### Claim 77 (depends on 74)

The method of claim 74, wherein the allowable range is inversely proportional to a comb-N PRS configuration without frequency staggering.

### Claim 78 (depends on 74)

The method of claim 74, wherein the allowable range is on an order of nanoseconds (ns).

### Claim 79 (depends on 74)

The method of claim 74, wherein the allowable range is based on a numerology of the PRS configuration.

### Claim 80 (depends on 79)

The method of claim 79, wherein the allowable range is not greater than T·1000/(14·N) ns, where T is a slot size in microseconds (μs), and wherein the PRS configuration is of comb-N.

### Claim 81 (depends on 74)

The method of claim 74, wherein determining the RSTD search window based on the PRS configuration comprises:
determining a different RSTD search window for each frequency range associated with the PRS configuration.

### Claim 82 (depends on 74)

The method of claim 74, wherein a resolution value for the RSTD search window is K·Tc·2u, where Tc=1/(480,000·4096) and wherein K={1, 2, 3} and u={1, 2, 3, 4, 5, 6}.

### Claim 83 (depends on 82)

The method of claim 82, wherein selected values of K or u are based on a numerology of the PRS configuration.

### Claim 84 (depends on 83)

The method of claim 83, wherein K=3 and u=6 based on the numerology having a 15 kilohertz (kHz) subcarrier spacing.

### Claim 85 (depends on 83)

The method of claim 83, wherein K is selected from integers 1, 2, or 3 with u less than 6 for any numerology having a subcarrier spacing greater than 15 kHz.

### Claim 86 (depends on 82)

The method of claim 82, wherein selected values of K or u are configured.

### Claim 87 (depends on 82)

The method of claim 82, wherein the expected RSTD parameter is encoded using 14 bits with a granularity 3·Tc·2μ1, where u1={1, 2, 3, 4, 5, 6} and T is 0.509 nanoseconds.

### Claim 88 (depends on 82)

The method of claim 82, wherein the RSTD uncertainty parameter is encoded using 10 bits with a granularity 3·Tc·2μ2, where u2={1, 2, 3, 4, 5, 6} and T is 0.509 nanoseconds.

### Claim 89 (depends on 88)

The method of claim 88, wherein u1 and u2 are different.

### Claim 90 (depends on 74)

The method of claim 74, wherein providing the RSTD search window further comprises:
configuring multiple RSTD search windows with multiple allowable ranges; and
providing the multiple RSTD search windows with the multiple allowable ranges to the UE via the base station.

### Claim 91 (depends on 90)

The method of claim 90, wherein at least one of the multiple RSTD search windows is associated with a resolution.

### Claim 92 (depends on 90)

The method of claim 90, further comprising:
signaling to the UE which one of the multiple RSTD search windows to apply to a PRS configuration, a PRS occasion, a PRS instance, or a PRS occasion group.

### Claim 93 (depends on 92)

The method of claim 92, wherein the UE is signaled using downlink control information (DCI) or medium access control (MAC) control element (CE).

### Claim 94 (depends on 90)

The method of claim 90, further comprising:
receiving a report from the UE reporting RSTDs determined for the multiple RSTD search windows.

### Claim 95 (depends on 90)

The method of claim 90, wherein a different RSTD search window of the multiple RSTD search windows is configured for each frequency band on which the UE is expected to measure the plurality of PRS.

### Claim 96 (depends on 90)

The method of claim 90, wherein a different RSTD search window of the multiple RSTD search windows is configured for each frequency range in which the UE is expected to measure the plurality of PRS.

### Claim 97 (depends on 74)

The method of claim 74, wherein the PRS configuration is aperiodic PRS or semi-persistent PRS.

### Claim 98 (depends on 74)

The method of claim 74, further comprising:
obtaining a position estimate of the UE, wherein an accuracy of the position estimate is less than aliasing repetitions produced by a comb-N PRS configuration.

### Claim 99 (depends on 98)

The method of claim 98, wherein the position estimate of the UE is obtained while tracking the UE.

### Claim 100 (depends on 74)

The method of claim 74, wherein the RSTD search window is provided as part of downlink positioning reference signal assistance information, and
wherein a size of the RSTD search window is provided in the downlink positioning reference signal assistance information as a number of one or more orthogonal frequency division multiplexing (OFDM) symbols.

### Claim 101 (depends on 100)

The method of claim 100, wherein the number of the one or more OFDM symbols is based on a frequency range in which the UE is expected to measure the plurality of PRS.

### Claim 102 (depends on 100)

The method of claim 100, wherein each of a search window offsets per cell per occasion parameter, a search window size per cell per occasion, and a full search range for all cells per positioning session parameter are represented by a number of one or more OFDM symbols.

### Claim 103 (depends on 74)

The method of claim 74, wherein:
the frequency range of the plurality of PRS is Frequency Range 1 (FR1), and a value of the RSTD uncertainty parameter is +/−32 microseconds.

### Claim 104 (depends on 74)

The method of claim 74, wherein:
the frequency range of the plurality of PRS is Frequency Range 2 (FR2), and a value of the RSTD uncertainty parameter is +/−8 microseconds.

### Claim 105

A network entity, comprising:
a transceiver circuitry;
a memory circuitry; and
a processor circuitry communicatively coupled to the transceiver circuitry and the memory circuitry, wherein the processor circuitry is configured to:
obtain a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
provide the RSTD search window to a user equipment (UE); and
transmit a plurality of PRS defined by the PRS configuration to the UE, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 106

A network entity, comprising:
means for obtaining a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
means for providing the RSTD search window to a user equipment (UE); and
means for transmitting a plurality of PRS defined by the PRS configuration to the UE, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 107

A non-transitory computer-readable medium storing computer-executable instructions for a network entity, the computer-executable instructions comprising:
one or more instructions instructing the network entity to obtain a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, and wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
one or more instructions instructing the network entity to provide the RSTD search window to a user equipment (UE); and
one or more instructions instructing the network entity to transmit a plurality of PRS defined by the PRS configuration to the UE, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 108

A user equipment (UE), comprising:
a transceiver circuitry;
a memory circuitry; and
a processor circuitry communicatively coupled to the transceiver circuitry and the memory circuitry, wherein the processor circuitry is configured to:
receive a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
receive a plurality of PRS defined by the PRS configuration from a network node, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth; and
determine an RSTD between the network node and a reference node based on the RSTD search window.

### Claim 109

A user equipment (UE), comprising:
means for receiving a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
means for receiving a plurality of PRS defined by the PRS configuration from a network node, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth; and
means for determining an RSTD between the network node and a reference node based on the RSTD search window.

### Claim 110

A non-transitory computer-readable medium storing computer-executable instructions for a user equipment (UE), the computer-executable instructions comprising:
one or more instructions instructing the UE to receive a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, and wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
one or more instructions instructing the UE to receive a plurality of PRS defined by the PRS configuration from a network node, wherein the plurality of PRS is transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth; and
one or more instructions instructing the UE to determine an RSTD between the network node and a reference node based on the RSTD search window.

### Claim 111

A location server, comprising:
a transceiver circuitry;
a memory circuitry; and
a processor circuitry communicatively coupled to the transceiver circuitry and the memory circuitry, wherein the processor circuitry is configured to:
determine a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
provide the RSTD search window to a user equipment (UE) via a base station serving the UE; and
configure a plurality of PRS defined by the PRS configuration to be transmitted to the UE, wherein the plurality of PRS is to be transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 112

A location server, comprising:
means for determining a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
means for providing the RSTD search window to a user equipment (UE) via a base station serving the UE; and
means for configuring a plurality of PRS defined by the PRS configuration to be transmitted to the UE, wherein the plurality of PRS is to be transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.

### Claim 113

A non-transitory computer-readable medium storing computer-executable instructions for a location server, the computer-executable instructions comprising:
one or more instructions instructing the location server to determine a reference signal timing difference (RSTD) search window based on a positioning reference signal (PRS) configuration, wherein the RSTD search window is defined by an expected RSTD parameter and an RSTD uncertainty parameter, wherein the RSTD search window has an allowable range based on the PRS configuration, and wherein a different size of the RSTD search window is determined for each frequency range associated with the PRS configuration;
one or more instructions instructing the location server to provide the RSTD search window to a user equipment (UE) via a base station serving the UE; and
one or more instructions instructing the location server to configure a plurality of PRS defined by the PRS configuration to be transmitted to the UE, wherein the plurality of PRS is to be transmitted in a subset of subcarriers that is less than all subcarriers over a given bandwidth.