Time division multiplexing of synchronization channels

• US 10,615,897 B2
• Filed: 05/30/2017
• Issued: 04/07/2020
• Est. Priority Date: 06/01/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Islam, Muhammad Nazmul, Abedini, Navid, Luo, Tao, Subramanian, Sundar, Cezanne, Juergen, Sampath, Ashwin, Gorokhov, Alexei Yurievitch, Li, Junyi, Sadiq, Bilal
• Primary Examiner(s): Sheikh, Ayaz R
• Assistant Examiner(s): Aga, Sori A
• Application Number:
  US15/608,884
• Publication Number:
  US 20170353257A1
• Time in Patent Office: 1,043 Days
• Field of Search: None
• CPC Class Codes: H04J 11/0079 Acquisition of downlink reference signals, e.g. detection of cell-ID
• CPC Class Codes: H04J 3/0617 the synchronising signal being characterised by the frequency or phase
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 25/022 of frequency response
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 56/0035 detecting errors in frequency or phase

Abstract

The apparatus may be a user equipment (UE). The apparatus receives a transmission of at least one of a plurality of first synchronization signals. The apparatus receives at least one repeat transmission of the at least one of the plurality of first synchronization signals. In an aspect, the transmission and the at least one repeat transmission are received in a same synchronization signal block.

Claims

1. A method of wireless communication by a user equipment (UE), comprising:

receiving a transmission of at least one of a plurality of first synchronization signals, the first synchronization signals including a physical broadcast channel (PBCH) signal; and

receiving at least one repeat transmission of the at least one of the plurality of first synchronization signals, including at least one repeat of the PBCH signal,

wherein the transmission and the at least one repeat transmission are received in a same synchronization signal block, at least one PBCH signal and at least one repeated PBCH signal separated from each other in time by at least one of a primary synchronization signal (PSS) or secondary synchronization signal (SSS).

2. The method of claim 1, further comprising:

estimating a carrier frequency offset based on the received transmission of the at least one of the plurality of first synchronization signals and the received at least one repeat transmission of the at least one of the plurality of first synchronization signals.

3. The method of claim 2, further comprising:

correcting a carrier frequency of the UE based on the carrier frequency offset.

4. The method of claim 2, wherein the carrier frequency offset is estimated based on a difference between the reception of the transmission of the at least one of the plurality of first synchronization signals and the reception of the at least one repeat transmission of the at least one of the plurality of first synchronization signals, the difference being at least one of a time difference or a frequency difference.

5. The method of claim 1, wherein the plurality of first synchronization signals further include at least one of a beam reference signal (BRS), an extended synchronization signal (ESS), a primary synchronization signal (PSS), or a secondary synchronization signal (SSS).

6. The method of claim 1, wherein the at least one of plurality of first synchronization signals further includes a demodulation reference signal (DMRS).

7. The method of claim 2, further comprising:

receiving at least one of plurality of second synchronization signals, wherein the at least one of the plurality of first synchronization signals and the at least one of the plurality of second synchronization signals are received in a same synchronization subframe.

8. The method of claim 7, wherein the receiving the at least one of the plurality of second synchronization signals comprises receiving the at least one of the plurality of second synchronization signals after receiving the transmission of the at least one of the plurality of first synchronization signals and before receiving the at least one repeat transmission of the at least one of the plurality of first synchronization signals.

9. The method of claim 7, wherein the plurality of second synchronization signals include at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS).

10. The method of claim 7, wherein the at least one of the plurality of second synchronization signals includes a primary synchronization signal (PSS), and

wherein the carrier frequency offset is estimated further based on the PSS.

11. The method of claim 7, further comprising:

detecting a secondary synchronization signal (SSS) based on the estimated carrier frequency offset,

wherein the at least one of the plurality of second synchronization signals includes the SSS.

12. The method of claim 2, further comprising:

decoding the at least one of the plurality of first synchronization signals based on the estimated carrier frequency offset.

13. The method of claim 7, wherein the transmission of the at least one of the plurality of second synchronization signals is received via a first receive beam and the repeat transmission of the at least one of the plurality of second synchronization signals is received via a second receive beam, and

wherein the method further comprises:

selecting a receive beam from the first receive beam and the second receive beam based on a reception condition of the transmission of the at least one of the plurality of second synchronization signals and a reception condition of the repeated transmission of the at least one of the plurality of second synchronization signals.

14. The method of claim 7, wherein the plurality of first synchronization signals and the plurality of second synchronization signals are processed by time-division multiplexing the plurality of first synchronization signals and the plurality of second synchronization signals, and

wherein the method further comprises demultiplexing the plurality of first synchronization signals and the plurality of second synchronization signals.

15. A user equipment (UE) for wireless communication, comprising:

means for receiving a transmission of at least one of a plurality of first synchronization signals, the first synchronization signals including a physical broadcast channel (PBCH) signal; and

means for receiving at least one repeat transmission of the at least one of the plurality of first synchronization signals, including at least one repeat of the PBCH signal,

wherein the transmission and the at least one repeat transmission are received in a same synchronization signal block, at least one PBCH signal and at least one repeated PBCH signal separated from each other in time by at least one of a primary synchronization signal (PSS) or secondary synchronization signal (SSS).

16. The UE of claim 15, further comprising:

means for estimating a carrier frequency offset based on the received transmission of the at least one of the plurality of first synchronization signals and the received at least one repeat transmission of the at least one of the plurality of first synchronization signals.

17. The UE of claim 16, further comprising:

means for correcting a carrier frequency of the UE based on the carrier frequency offset.

18. The UE of claim 16, wherein the carrier frequency offset is estimated based on a difference between the reception of the transmission of the at least one of the plurality of first synchronization signals and the reception of the at least one repeat transmission of the at least one of the plurality of first synchronization signals, the difference being at least one of a time difference or a frequency difference.

19. The UE of claim 15, wherein the plurality of first synchronization signals further include at least one of a beam reference signal (BRS), an extended synchronization signal (ESS), a primary synchronization signal (PSS), or a secondary synchronization signal (SSS).

20. The UE of claim 15, wherein the at least one of plurality of first synchronization signals further includes a demodulation reference signal (DMRS).

21. The UE of claim 16, further comprising:

means for receiving at least one of plurality of second synchronization signals, wherein the at least one of the plurality of first synchronization signals and the at least one of the plurality of second synchronization signals are received in a same synchronization subframe.

22. The UE of claim 21, wherein the means for receiving the at least one of the plurality of second synchronization signals is configured to receive the at least one of the plurality of second synchronization signals after receiving the transmission of the at least one of the plurality of first synchronization signals and before receiving the at least one repeat transmission of the at least one of the plurality of first synchronization signals.

23. The UE of claim 21, wherein the plurality of second synchronization signals include at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS).

24. The UE of claim 21, wherein the at least one of the plurality of second synchronization signals includes a primary synchronization signal (PSS), and

wherein the carrier frequency offset is estimated further based on the PSS.

25. The UE of claim 21, further comprising:

means for detecting a secondary synchronization signal (SSS) based on the estimated carrier frequency offset,

wherein the at least one of the plurality of second synchronization signals includes the SSS.

26. The UE of claim 16, further comprising:

means for decoding the at least one of the plurality of first synchronization signals based on the estimated carrier frequency offset.

27. The UE of claim 21, wherein the transmission of the at least one of the plurality of second synchronization signals is received via a first receive beam and the repeat transmission of the at least one of the plurality of second synchronization signals is received via a second receive beam, and

wherein the UE further comprises:

means for selecting a receive beam from the first receive beam and the second receive beam based on a reception condition of the transmission of the at least one of the plurality of second synchronization signals and a reception condition of the repeated transmission of the at least one of the plurality of second synchronization signals.

28. The UE of claim 21, wherein the plurality of first synchronization signals and the plurality of second synchronization signals are processed by time-division multiplexing the plurality of first synchronization signals and the plurality of second synchronization signals, and

wherein the UE further comprises means for demultiplexing the plurality of first synchronization signals and the plurality of second synchronization signals.

33. The UE of claim 27, wherein the plurality of first synchronization signals further include at least one of a beam reference signal (BRS), an extended synchronization signal (ESS), a primary synchronization signal (PSS), or a secondary synchronization signal (SSS).

34. The UE of claim 27, wherein the at least one of plurality of first synchronization signals further includes a demodulation reference signal (DMRS).

29. A user equipment (UE) for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive a transmission of at least one of a plurality of first synchronization signals, the first synchronization signals including a physical broadcast channel (PBCH) signal; and

receive at least one repeat transmission of the at least one of the plurality of first synchronization signals, including at least one repeat of the PBCH signal,

wherein the transmission and the at least one repeat transmission are received in a same synchronization signal block, at least one PBCH signal and at least one repeated PBCH signal separated from each other in time by at least one of a primary synchronization signal (PSS) or secondary synchronization signal (SSS).

30. The UE of claim 29, wherein the at least one processor is further configured to:

estimate a carrier frequency offset based on the received transmission of the at least one of the plurality of first synchronization signals and the received at least one repeat transmission of the at least one of the plurality of first synchronization signals.

31. The UE of claim 30, wherein the at least one processor is further configured to:

correct a carrier frequency of the UE based on the carrier frequency offset.

32. The UE of claim 30, wherein the carrier frequency offset is estimated based on a difference between the reception of the transmission of the at least one of the plurality of first synchronization signals and the reception of the at least one repeat transmission of the at least one of the plurality of first synchronization signals, the difference being at least one of a time difference or a frequency difference.

35. The UE of claim 30, wherein the at least one processor is further configured to:

receive at least one of plurality of second synchronization signals, wherein the at least one of the plurality of first synchronization signals and the at least one of the plurality of second synchronization signals are received in a same synchronization subframe.

36. The UE of claim 35, wherein the at least one processor configured to receive the at least one of the plurality of second synchronization signals is configured to receive the at least one of the plurality of second synchronization signals after receiving the transmission of the at least one of the plurality of first synchronization signals and before receiving the at least one repeat transmission of the at least one of the plurality of first synchronization signals.

37. The UE of claim 35, wherein the plurality of second synchronization signals include at least one of a primary synchronization signal (PSS) or a secondary synchronization signal (SSS).

38. The UE of claim 35, wherein the at least one of the plurality of second synchronization signals includes a primary synchronization signal (PSS), and

wherein the carrier frequency offset is estimated further based on the PSS.

39. The UE of claim 35, wherein the at least one processor is further configured to:

detect a secondary synchronization signal (SSS) based on the estimated carrier frequency offset,

wherein the at least one of the plurality of second synchronization signals includes the SSS.

40. The UE of claim 30, wherein the at least one processor is further configured to:

decode the at least one of the plurality of first synchronization signals based on the estimated carrier frequency offset.

41. The UE of claim 35, wherein the transmission of the at least one of the plurality of second synchronization signals is received via a first receive beam and the repeat transmission of the at least one of the plurality of second synchronization signals is received via a second receive beam, and

wherein the at least one processor is further configured to:

select a receive beam from the first receive beam and the second receive beam based on a reception condition of the transmission of the at least one of the plurality of second synchronization signals and a reception condition of the repeated transmission of the at least one of the plurality of second synchronization signals.

42. The UE of claim 35, wherein the plurality of first synchronization signals and the plurality of second synchronization signals are processed by time-division multiplexing the plurality of first synchronization signals and the plurality of second synchronization signals, and

wherein the at least one processor is further configured to demultiplex the plurality of first synchronization signals and the plurality of second synchronization signals.

43. A non-transitory computer-readable medium storing computer executable code for wireless communication by a user equipment (UE), comprising code to:

receive a transmission of at least one of a plurality of first synchronization signals, the first synchronization signals including a physical broadcast channel (PBCH) signal;

receive at least one repeat transmission of the at least one of the plurality of first synchronization signals, including at least one repeat of the PBCH signal,

wherein the transmission and the at least one repeat transmission are received in a same synchronization signal block, at least one PBCH signal and at least one repeated PBCH signal separated from each other in time by at least one of a primary synchronization signal (PSS) or secondary synchronization signal (SSS).