# US 11,445,469 B2 · Method, apparatus and system for determining a position of a wireless device

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- Number: US 11,445,469 B2
- Document ID: US11445469B2
- Status: Granted
- Kind: B2
- Application number: 16/965,025
- Filed: 2018-02-09
- Published: 2021-04-15
- Granted: 2022-09-13
- Earliest claimed: 2018-02-09
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Satyam Dwivedi; Henrik Asplund; Jonas Medbo; Fredrik Gunnarsson; Ali Zaidi; Sara Modarres Razavi
- Web page: https://patentgrep.com/patent/US11445469B2

## 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})
- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- G01S 5/0205: {Details}
- G01S 5/02216: {Timing or synchronisation of the receivers}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 56/001: {Synchronization between nodes}
- H04W 56/0075: {based on arrival time vs. expected arrival time}
- H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management
- 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)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and apparatuses for determining a position of a wireless device in a wireless communication network are provided. The method includes obtaining a first sequence of Time Difference of Arrivals (TDOAs) at the wireless device of reference signals, which are transmitted by and used for synchronization of a first pair of network nodes; and determining, based on the first sequence of TDOAs, a first relative distance. The method also includes obtaining a second sequence of TDOAs at the wireless device of reference signals, which are transmitted by and used for synchronization of a second pair of network nodes; and determining, based on the first sequence of TDOAs, a second relative distance. The method further includes determining the position of the wireless device based on the first and second relative distances. Corresponding computer programs and computer program carriers are also disclosed.

## Claims

### Claim 1

A method performed by a positioning node for determining a position of a wireless device in a wireless communication network, the method comprising:
obtaining a first sequence of Time Difference of Arrivals (TDOAs) at the wireless device of reference signals, which are transmitted by and used for synchronization of a first pair of network nodes;
determining a first base offset and a first delay in response associated with the first sequence of TDOAs;
determining a first relative distance d2u−d1u based on the first base offset and the first delay in response if the first delay in response is more than zero, wherein the first relative distance d2u−d1u is a difference between distances from the wireless device to each network node in the first pair;
obtaining a second sequence of TDOAs at the wireless device of reference signals, which are transmitted by and used for synchronization of a second pair of network nodes;
determining a second base offset and a second delay in response associated with the second sequence of TDOAs;
determining a second relative distance d4u−d3u based on the second base offset and the second delay in response if the second delay in response is more than zero, wherein the second relative distance d4u−d3u is a difference between distances from the wireless device to each network node in the second pair; and
determining the position of the wireless device based on the first and second relative distances d2u−d1u, d4u−d3u.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the determining of the position comprises:
determining the position which is consistent with both the first and second relative distances d2u−d1u, d4u−d3u.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
obtaining a minimum number of TDOAs to be measured and a rate of measuring the TDOAs for each sequence of TDOAs, from one of the network nodes which is serving the wireless device.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the first and second sequences of TDOAs is obtained by receiving the first and second sequences of TDOAs from the wireless device.

### Claim 5

A positioning node for determining a position of a wireless device in a wireless communication network, the positioning node is configured to:
obtain a first sequence of Time Difference of Arrivals (TDOAs) at the wireless device of reference signals, which are transmitted by and used for synchronization of a first pair of network nodes;
determine a first base offset and a first delay in response associated with the first sequence of TDOAs;
determine a first relative distance d2u−d1u based on the first base offset and the first delay in response if the first delay in response is more than zero, wherein the first relative distance d2u−d1u is a difference between distances from the wireless device to each network node in the first pair;
obtain a second sequence of TDOAs at the wireless device of reference signals, which are transmitted by and used for synchronization of a second pair of network nodes;
determine a second base offset and a second delay in response associated with the second sequence of TDOAs;
determine a second relative distance d4u−d3u based on the second base offset and the second delay in response if the second delay in response is more than zero, wherein the second relative distance d4u−d3u, is a difference between distances from the wireless device to each network node in the second pair; and
determine the position of the wireless device based on the first and second relative distances d2u−d1u, d4u−d3u.

### Claim 6 (depends on 5)

The positioning node according to claim 5, further configured to:
determine the position which is consistent with both the first and second relative distances d2u−d1u, d4u−d3u.

### Claim 7 (depends on 5)

The positioning node according to claim 5, further configured to:
obtain a minimum number of TDOAs to be measured and a rate of measuring the TDOAs for each sequence of TDOAs, from one of the network nodes which is serving the wireless device.

### Claim 8 (depends on 5)

The positioning node according to claim 5, further configured to obtain the first and second sequences of TDOAs by receiving the first and second sequences of TDOAs from the wireless device.