# US 2023/0403667 A1 · Methods for timing advance indication and timing relationships indication for non-terrestrial networks

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- Number: US 2023/0403667 A1
- Document ID: US20230403667A1
- Status: Published application
- Kind: A1
- Application number: 18/239,996
- Filed: 2023-08-30
- Published: 2023-12-14
- Earliest claimed: 2020-05-08
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Seyed Mohsen Hosseinian; Jung Hyun Bae; Homayoon Hatami; Jungwon Lee
- Web page: https://patentgrep.com/patent/US20230403667A1

## CPC

- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04B 7/1851: {Systems using a satellite or space-based relay (H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576)}
- H04B 7/1853: {Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service (for selecting H04W)}
- H04W 56/005: {compensating for timing error by adjustment in the receiver}
- H04W 56/006: {using known positions of transmitter and receiver}
- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

A method of enabling communication between a user equipment (UE) and a non-terrestrial network (NTN), is described. The UE may be able to calculate a timing advance compensation. The timing advance compensation may be a differential or full timing advance compensation. An offset value, Koffset, may be indicated to the UE. The Koffset value may be used for timing relationships.

## Claims

### Claim 1

A method of enabling communication between a user equipment (UE) and a non-terrestrial network (NTN), comprising:
receiving, at the UE, satellite position data of the NTN,
determining, at the UE, a UE position,
calculating, at the UE, a first distance between the UE position and the satellite position data,
calculating, at the UE, a timing advance based on the first distance,
receiving, at the UE, a Koffset value, and
applying, at the UE, one or both of the timing advance and Koffset to configure transmission or reception of communication with the NTN.

### Claim 2 (depends on 1)

The method of claim 1, wherein the satellite position data is ephemeris or positional data.

### Claim 3 (depends on 1)

The method of claim 1, wherein the UE further receives a gateway position data.

### Claim 4 (depends on 3)

The method of claim 3, wherein the UE further calculates a second distance between the satellite position data and the gateway position data.

### Claim 5 (depends on 4)

The method of claim 4, wherein the UE further calculates the timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the second distance by the speed to obtain a second propagation delay,
summing the first propagation delay and the second propagation delay, and doubling the sum.

### Claim 6 (depends on 4)

The method of claim 4, wherein the timing advance is a full timing advance compensation.

### Claim 7 (depends on 1)

The method of claim 1, wherein the UE further receives a reference point position data, wherein the reference point position data is on a feeder link.

### Claim 8 (depends on 7)

The method of claim 7, wherein the UE further receives a common timing advance value.

### Claim 9 (depends on 8)

The method of claim 8, wherein the UE further calculates a third distance between the reference point position data and the satellite position data.

### Claim 10 (depends on 9)

The method of claim 9, wherein the UE further calculates the timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the third distance by the speed to obtain a third propagation delay,
summing the first propagation delay, the third propagation delay, and the common timing advance value, and
doubling the sum.

### Claim 11 (depends on 10)

The method of claim 10, wherein the timing advance is one of a full timing advance compensation and a differential timing advance compensation.

### Claim 12 (depends on 7)

The method of claim 7, wherein the reference point position data is the satellite position data.

### Claim 13 (depends on 1)

The method of claim 1, wherein the UE further receives a reference point position data, wherein the reference point position data is located in a cell that the UE is located in.

### Claim 14 (depends on 13)

The method of claim 13, wherein the UE further receives a common timing advance value.

### Claim 15 (depends on 14)

The method of claim 14, wherein the UE further calculates a fourth distance between the reference point position data and the satellite position data.

### Claim 16 (depends on 15)

The method of claim 15, wherein the UE further calculates a differential timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the fourth distance by the speed to obtain a fourth propagation delay,
subtracting the fourth propagation delay from the first propagation delay, and
doubling the subtraction.

### Claim 17 (depends on 1)

The method of claim 1, wherein the UE receives a Koffset value in a group common DCI format, and/or a MAC-CE format, and the Koffset value is a fixed number of bits.

### Claim 18 (depends on 1)

The method of claim 1, wherein the Koffset value is greater than or equal to the timing advance.

### Claim 19 (depends on 17)

The method of claim 17, wherein the Koffset value is used for timing for a PUSCH transmission scheduled by DCI.

### Claim 20

A system that enables communication between a user equipment (UE) and a non-terrestrial network (NTN), the system configured to:
receive, at the UE, satellite position data of the NTN,
determine, at the UE, a UE position,
calculate, at the UE, a first distance between the UE position and the satellite position data,
calculate, at the UE, a timing advance based on the first distance,
receive, at the UE, a Koffset value, and
apply, at the UE, one or both of the timing advance and the Koffset to configure transmission or reception of communication with the NTN.