Frequency adjustment for high speed LTE deployments

Patent metadata

Field	Value
Publication number	US-11316586-B2
Application number	US-201716336435-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Sep 26, 2016
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Systems and methods relating to correction of a Doppler/frequency offset in a wireless communication system are disclosed. In some embodiments, a method of operation of a node comprises estimating a Doppler/frequency offset for a wireless device based on an uplink signal received from the wireless device and providing a frequency adjustment to the wireless device that corrects for the Doppler/frequency offset. In this manner, the Doppler/frequency offset for a wireless device is determined and corrected.

First claim

What is claimed is:

1. A method of operation of a node, the method comprising:
estimating a Doppler/frequency offset for a wireless device based on an uplink signal received from the wireless device, wherein the Doppler/frequency offset for the wireless device is a residual Doppler/frequency offset for the wireless device after compensation for the Doppler/frequency offset for a reference location within a cell in which the wireless device is located;
providing a frequency adjustment to the wireless device that corrects for the Doppler/frequency offset;
receiving a scheduled uplink transmission from the wireless device, wherein the scheduled uplink transmission is associated with the provided frequency adjustment;
in response to receiving the scheduled uplink transmission, sending contention resolution information to the wireless device to provide contention resolution; and
continuously or periodically monitoring the residual Doppler/frequency offset of the UE and signalling the UE to adjust uplink frequency as appropriate in subsequent communications.

2. The method of claim 1 , wherein the node is a radio access node.

3. The method of claim 2 , wherein the radio access node is a moving radio access node.

4. The method of claim 2 , wherein the radio access node is a high-speed, moving radio access node.

5. The method of claim 2 , wherein the radio access node is a moving radio access node that is in the sky.

6. The method of claim 2 , wherein the radio access node is a satellite.

7. The method of claim 1 , wherein:
the wireless device is served by a moving radio access node,
the node is a network node communicatively coupled to the moving radio access node, and
providing the frequency adjustment to the wireless device comprises providing the frequency adjustment to the wireless device via the moving radio access node.

8. The method of claim 1 , wherein the uplink signal received from the wireless device is a random access preamble.

9. The method of claim 8 , wherein providing the frequency adjustment to the wireless device comprises providing a random access response to the wireless device, the random access response comprising the frequency adjustment.

10. A node, comprising:
at least one processor; and
memory comprising instructions executable by the at least one processor whereby the node is operable to:
estimate a Doppler/frequency offset for a wireless device based on an uplink signal received from the wireless device, wherein the Doppler/frequency offset for the wireless device is a residual Doppler/frequency offset for the wireless device after compensation for the Doppler/frequency offset for a reference location within a cell in which the wireless device is located;
provide a frequency adjustment to the wireless device that corrects for the Doppler/frequency offset;
receive a scheduled uplink transmission from the wireless device, wherein the scheduled uplink transmission is associated with the provided frequency adjustment;
in response to the reception of the scheduled uplink transmission, send contention resolution information to the wireless device to provide contention resolution; and
continuously or periodically monitor the residual Doppler/frequency offset of the UE and signal the UE to adjust uplink frequency as appropriate in subsequent communications.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Lin Xingqin
• Adhikary Ansuman
• Khayrallah Ali S
• Wang Yi-Pin Eric

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04W84/005

  Moving wireless networks · CPC title

• H04L2027/0095

  in a preamble or similar structure · CPC title

• H04B7/1855

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

• H04L27/0014

  Carrier regulation (of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657) · CPC title