Gradual frequency adjustment for dual-loop frequency control in non-terrestrial network

Patent metadata

Field	Value
Publication number	US-12574879-B2
Application number	US-202217935851-A
Country	US
Kind code	B2
Filing date	Sep 27, 2022
Priority date	Apr 14, 2022
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine, after an update to a location or a velocity of the UE, a closed-loop frequency pre-compensation and an open-loop frequency pre-compensation. The UE may transmit, after the update to the location or the velocity of the UE, an uplink signal using a frequency pre-compensation that is based at least in part on the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation. Numerous other aspects are described.

First claim

What is claimed is:

1 . A user equipment (UE), comprising:
one or more memories; and one or more processors, coupled to the one or more memories, configured to:
receive one or more frequency pre-compensation commands from a network node;
determine, after an update to a location or a velocity of the UE, a closed-loop frequency pre-compensation and an open-loop frequency pre-compensation, wherein:
the closed-loop frequency pre-compensation is determined based at least in part on the one or more frequency pre-compensation commands, and
the open-loop frequency pre-compensation is determined based at least in part on the update to the location or the velocity of the UE; and

transmit, after the update to the location or the velocity of the UE, an uplink signal using a frequency pre-compensation that is based at least in part on the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation.

2 . The UE of claim 1 ,
wherein the one or more processors, to determine the closed-loop frequency pre-compensation, are configured to reset the closed-loop frequency pre-compensation to zero.

3 . The UE of claim 2 ,
wherein the closed-loop frequency pre-compensation is reset to zero after the update to the location or the velocity of the UE.

4 . The UE of claim 2 ,
wherein the closed-loop frequency pre-compensation is reset to zero based at least in part on one or more of a change to the location of the UE satisfying a first threshold, a change to the velocity of the UE satisfying a second threshold, or an elapsed time since a most recent reset of the closed-loop frequency pre-compensation satisfying a third threshold.

5 . The UE of claim 4 ,
wherein one or more of the first threshold, the second threshold, or the third threshold are configured in cell-specific or UE-specific signaling.

6 . The UE of claim 1 ,
wherein the one or more processors, to determine the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation, are configured to:
determine that a physical random access channel (PRACH) was previously transmitted using a value for the open-loop frequency pre-compensation that was based on first values for the location and the velocity of the UE;
calculate the open-loop frequency pre-compensation according to the first values for the location and the velocity of the UE and current values for a satellite location and a satellite velocity; and
calculate the closed-loop frequency pre-compensation according to the one or more frequency pre-compensation commands received from the network node.

7 . The UE of claim 1 ,
wherein the one or more processors, to determine the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation, are configured to:
calculate, at a time of the update to the location or the velocity of the UE, a change to the open-loop frequency pre-compensation caused by the update to the location or the velocity of the UE; and
subtract the change to the open-loop frequency pre-compensation from the closed-loop frequency pre-compensation.

8 . The UE of claim 1 ,
wherein the one or more processors, to determine the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation, are configured to:
calculate, at a time of the update to the location or the velocity of the UE, a change to the open-loop frequency pre-compensation caused by the update to the location or the velocity of the UE;
estimate a fraction of the change to the open-loop frequency pre-compensation that has been corrected by the one or more frequency pre-compensation commands received from the network node; and
subtract the estimated fraction of the change to the open-loop frequency pre-compensation from the closed-loop frequency pre-compensation.

9 . The UE of claim 1 ,
wherein the one or more processors are further configured to:
transmit, to the network node, a notification indicating that a global navigation satellite system (GNSS) location update will be performed within a time period; and
receive, from the network node, an indication that control over one or more of the closed-loop frequency pre-compensation or a closed-loop timing advance is suspended based at least in part on the notification.

10 . The UE of claim 1 ,
wherein the one or more processors are further configured to:
transmit, to the network node, a notification indicating that a global navigation satellite system (GNSS) location update will be performed within a time period; and
receive, from the network node, one or more closed-loop timing advance or closed-loop frequency pre-compensation commands that offset a change in a total timing advance or a total frequency pre-compensation caused by the GNSS location update.

11 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving one or more frequency pre-compensation commands from a network node; determining, after an update to a location or a velocity of the UE, a closed-loop frequency pre-compensation and an open-loop frequency pre-compensation, wherein:
the closed-loop frequency pre-compensation is determined based at least in part on the one or more frequency pre-compensation commands, and
the open-loop frequency pre-compensation is determined based at least in part on the update to the location or the velocity of the UE; and
transmitting, after the update to the location or the velocity of the UE, an uplink signal using a frequency pre-compensation that is based at least in part on the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation.

12 . The method of claim 11 ,
wherein determining the closed-loop frequency pre-compensation includes resetting the closed-loop frequency pre-compensation to zero.

13 . The method of claim 12 ,
wherein the closed-loop frequency pre-compensation is reset to zero after the update to the location or the velocity of the UE.

14 . The method of claim 12 ,
wherein the closed-loop frequency pre-compensation is reset to zero based at least in part on one or more of a change to the location of the UE satisfying a first threshold, a change to the velocity of the UE satisfying a second threshold, or an elapsed time since a most recent reset of the closed-loop frequency pre-compensation satisfying a third threshold.

15 . The method of claim 14 ,
wherein one or more of the first threshold, the second threshold, or the third threshold are configured in cell-specific or UE-specific signaling.

16 . The method of claim 11 ,
wherein determining the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation includes:
determining that a physical random access channel (PRACH) was previously transmitted using a value for the open-loop frequency pre-compensation that was based on first values for the location and the velocity of the UE;
calculating the open-loop frequency pre-compensation according to the first values for the location and the velocity of the UE and current values for a satellite location and a satellite velocity; and
calculating the closed-loop frequency pre-compensation according to the one or more frequency pre-compensation commands received from the network node.

17 . The method of claim 11 ,
wherein determining the closed-loop frequency pre-compensation and the open-loop frequency pre-compensation includes:
calculating, at a time of the update to the location or the velocity of the UE, a change to the open-loop frequency pre-compensation caused by the update to th

Assignees

• Qualcomm Inc

Inventors

• Ma Liangping
• Park Changhwan
• Wang Xiao Feng
• Sayed Hassan Mohamad
• Ma Jun
• Phuyal Umesh
• Gaal Peter
• Xu Huilin
• Krishnamurthy Harikumar
• Shrestha Bharat
• Rico Alvarino Alberto
• Sengupta Ayan
• Ji Lianghai

Classifications

• H04W56/0035

  detecting errors in frequency or phase · CPC title

• H04W56/009

  Closed loop measurements · CPC title

• H04W56/007

  Open loop measurement · CPC title

• H04W56/0045 Primary

  compensating for timing error by altering transmission time · CPC title