Method for pre-compensating time differences

Patent metadata

Field	Value
Publication number	US-12549249-B2
Application number	US-202218076316-A
Country	US
Kind code	B2
Filing date	Dec 6, 2022
Priority date	Dec 9, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A method is provided for compensating time differences for the time alignment of uplink service frames and downlink service frames, the uplink service frames and the downlink service frames being exchanged between a satellite and a mobile terminal. The mobile terminal belonging to a 5G cell comprising a cell centre, the pre-compensation is calculated on the basis of a main beam directed towards the centre (O) of the cell (5G).

First claim

The invention claimed is:

1 . A method for pre-compensation of time differences for the time alignment of uplink service frames (UE UL) and downlink service frames (UE DL), said uplink service frames (UE UL) and said downlink service frames (UE DL) being exchanged between a multi-radiating element antenna in a satellite (SAT) and a mobile terminal (UE) in a main beam, said mobile terminal (UE) being adapted for providing 5G communications, wherein, the mobile terminal (UE) belonging to a 5G cell comprising a cell centre (O), the time pre-compensation is calculated and applied in the satellite on the basis of a main beam directed towards the centre (O) of said 5G cell, multiplexing and demultiplexing CPRI signals being performed in the satellite for the purpose of transmitting or receiving in a user link, a variable delay module, for each secondary beam, providing time-shifting for secondary beams, a main beam being formed from the secondary beams in the satellite including determining a direction of the main beam on the basis of position, velocity and acceleration parameters of the satellite and the centre of the 5G cell, weights determined by a base station of the 5G communication system being used to combine the secondary beams into the main beam in the antenna, between the time pre-compensation and the downlink part.

2 . The method according to claim 1 , wherein said pre-compensation is carried out on the downlink service frames (UE DL) and/or on the uplink service frames (UE UL).

3 . The method according to claim 1 , wherein the pre-compensation is calculated on the basis of a position, a velocity and/or an acceleration of the satellite (SAT).

4 . The method according to claim 1 , wherein said method further includes a Doppler pre-compensation for compensating frequency differences.

5 . The method according to claim 4 , wherein the Doppler pre-compensation is calculated on the basis of at least one parameter from a list of parameters comprising:
a position of the satellite; a velocity of the satellite; an acceleration of the satellite; a central frequency; the position of the centre of the cell.

6 . A payload of a satellite (SAT) comprising a device for pre-compensation of time differences for the purpose of time-aligning uplink service frames (UE UL) and downlink service frames (UE DL), said uplink service frames (UE UL) and said downlink service frames (UE DL) being exchanged between a satellite (SAT) and a mobile terminal (UE), said mobile terminal (UE) being adapted for providing 5G communications with the access network, wherein, the mobile terminal (UE) belonging to a 5G cell comprising a cell centre (O), the pre-compensation is calculated and applied on the basis of a main beam directed towards the centre (O) of said 5G cell.

7 . The payload of a satellite (SAT) according to claim 6 , wherein said downlink service frames (UE DL) are exchanged between a multi-radiating element antenna in the satellite (SAT) and the mobile terminal (UE) in the main beam.

8 . The payload of a satellite (SAT) according to claim 6 , wherein multiplexing and demultiplexing CPRI signals are performed in the satellite for the purpose of transmitting/receiving in the user link, a variable delay module, for each secondary beam, providing time-shifting for secondary beams, a main beam being formed from the secondary beams in the satellite including determining a direction of the main beam on the basis of position, velocity and acceleration parameters of the satellite and the centre of the 5G cell, weights determined by a base station of the 5G communication system being used to combine the secondary beams into the main beam in the antenna, between the pre-compensation and the downlink part.

9 . A communication system for 5G communication between at least one mobile terminal (UE) and an access network comprising a plurality of base stations (gNB), said communication system comprising at least one satellite (SAT), at least one base station of the plurality of base stations (gNB) and a gateway (Gate) positioned between said satellite (SAT) and said base station (gNB), said satellite (SAT) and said gateway (Gate) being capable of exchanging feeder link frames (gNB UL, gNB DL), said mobile terminal (UE) and said satellite (SAT) being capable of exchanging service frames (UE UL, UE DL) in a main beam, said satellite (SAT) being at the interface between the feeder link frames (gNB UL, gNB DL) and the service frames (UE UL, UE DL) for the exchange of data between the mobile terminal and the base station (gNB), said service frames (UE UL, UE DL) comprising uplink service frames (UE UL) and downlink service frames (UE DL), said uplink service frames (UE UL) having to be time-aligned with said downlink service frames (UE DL), said communication system comprising a pre-compensation device adapted for compensating time differences for the purpose of time-aligning the uplink service frames (UE UL) and the downlink service frames (UE DL), and wherein, the mobile terminal (UE) belonging to a 5G cell comprising a cell centre (O), the pre-compensation is calculated on the basis of a main beam directed towards the centre (O) of said 5G cell.

10 . The communication system according to claim 9 , wherein said pre-compensation is carried out on the downlink service frames (UE DL) and/or on the uplink service frames (UE UL).

11 . The communication system according to claim 9 , wherein the pre-compensation is calculated on the basis of a position, a velocity and/or an acceleration of the satellite (SAT).

12 . The communication system according to claim 9 , wherein said system includes means for a Doppler pre-compensation for compensating frequency differences.

13 . The communication system according to claim 12 , wherein the Doppler pre-compensation is calculated on the basis of at least one parameter from a list of parameters comprising:
a position of the satellite; a velocity of the satellite; an acceleration of the satellite; a central frequency; the position of the centre of the cell.

Assignees

• Thales Sa

Inventors

• Arnaud Mathieu
• Baudry Benjamin

Classifications

• H04B7/18573

  for operations control, administration or maintenance · CPC title

• H04B7/1855

  using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification · CPC title

• H04W56/004

  compensating for timing error of reception due to propagation delay · CPC title

• H04B7/18558 Primary

  Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations · CPC title

• H04B7/1851 Primary

  Systems using a satellite or space-based relay (H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576) · CPC title