Frequency correction in a multi-carrier communication system

Patent metadata

Field	Value
Publication number	US-11363554-B2
Application number	US-202016893091-A
Country	US
Kind code	B2
Filing date	Jun 4, 2020
Priority date	Dec 9, 2005
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A mobile station operable to perform cell synchronization is described. The mobile station can process one or more synchronization signals received in a downlink from one or more base stations providing coverage in one or more cells. The mobile station can process the one or more synchronization signals received from the one or more base stations to synchronize the mobile station with the one or more base stations. The mobile station can adjust signals for communication from the mobile station in accordance with the cell synchronization performed at the mobile station.

First claim

What is claimed is:

1. An apparatus of a mobile station operable to perform cell synchronization, the apparatus comprising:
memory; and
one or more processors configured to:
process, at the mobile station, a plurality of synchronization signals received from a plurality of base stations providing coverage in one or more cells;
process, at the mobile station, the plurality of synchronization signals received from the plurality of base stations to synchronize the mobile station with the plurality of base stations; and
adjust, at the mobile station, signals for communication from the mobile station in accordance with the cell synchronization performed at the mobile station.

2. The apparatus of claim 1 , further comprising a receiver configured to receive the plurality of synchronization signals in a downlink from the plurality of base stations.

3. The apparatus of claim 1 , wherein the plurality of synchronization signals include a first synchronization signal and a second synchronization signal.

4. The apparatus of claim 1 , wherein the one or more processors are further configured to process the plurality of synchronization signals to perform cell synchronization in a frequency domain.

5. The apparatus of claim 1 , wherein the one or more processors are further configured to process the plurality of synchronization signals to perform cell synchronization in a time domain.

6. The apparatus of claim 1 , wherein the plurality of synchronization signals are code sequences.

7. The apparatus of claim 1 , wherein the plurality of synchronization signals are received at the mobile station periodically in multiple slots in an orthogonal frequency division multiplexing (OFDM) symbol.

8. A method for performing cell synchronization at a mobile station, the method comprising:
processing, at the mobile station, a first synchronization signal received in a first downlink from a first base station;
processing, at the mobile station, a second synchronization signal received in a second downlink from a second base station;
processing, at the mobile station, the first synchronization signal and the second synchronization signal for the cell synchronization; and
adjusting, at the mobile station, signals for communication from the mobile station in accordance with the cell synchronization performed at the mobile station.

9. The method of claim 8 , wherein the first synchronization signal and the second synchronization signal occupy a center portion of a channel bandwidth.

10. The method of claim 8 , wherein the cell synchronization is performed at the mobile station in a frequency domain.

11. The method of claim 8 , wherein the cell synchronization is performed at the mobile station in a time domain.

12. The method of claim 8 , wherein the first synchronization signal and the second synchronization signals are code sequences.

13. The method of claim 8 , wherein the first synchronization signal is received at the mobile station periodically in multiple slots in an orthogonal frequency division multiplexing (OFDM) symbol.

14. At least one non-transitory machine readable storage medium having instructions embodied thereon for facilitating cell synchronization for a mobile station at a base station, the instructions when executed by one or more processors at the base station perform the following:
processing, from the base station, a plurality of synchronization signals for transmission to the mobile station, wherein the plurality of synchronization signals cause the mobile station to synchronize with the base station; and
processing, at the base station, communication signals received from the mobile station, wherein the communication signals are adjusted at the mobile station for communication in accordance with the cell synchronization performed at the mobile station.

15. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals are transmitted periodically to the mobile station in multiple slots in an orthogonal frequency division multiplexing (OFDM) symbol.

16. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals transmitted from the base station include a first synchronization signal and a second synchronization signal.

17. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals transmitted from the base station include a first synchronization signal and a second synchronization signal, wherein the first synchronization signal is near-orthogonal to the second synchronization signal.

18. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals transmitted from the base station include a first synchronization signal and a second synchronization signal that occupy a partial bandwidth of a channel or an entire bandwidth of the channel.

19. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals are transmitted to the mobile station to cause the mobile station to perform cell synchronization in a frequency domain.

20. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals are transmitted to the mobile station to cause the mobile station to perform cell synchronization in a time domain.

21. The at least one non-transitory machine readable storage medium of claim 14 , wherein the plurality of synchronization signals transmitted from the base station are code sequences.

Assignees

• Apple Inc

Inventors

• Li Xiaodong
• Lo Titus

Classifications

• H04L27/2602

  Signal structure · CPC title

• H04B7/015

  Reducing echo effects · CPC title

• H04W56/0035 Primary

  detecting errors in frequency or phase · CPC title

• H04B17/24

  with feedback of measurements to the transmitter · CPC title