SYNCHRONIZATION SIGNALING SUPPORTING MULTIPLE WAVEFORMS

• US 20180287840A1
• Filed: 03/26/2018
• Published: 10/04/2018
• Est. Priority Date: 04/04/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Akkarakaran, Sony, Luo, Tao, Sun, Jing, Malik, Rahul, Kadous, Tamer, Reddy, Akula
• Granted Patent: US 11,063,800 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 27/2604 Multiresolution systems by means of multiresolution subcarriers H04L27/183, H04L27/3488
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 27/2614 Peak power aspects
• CPC Class Codes: H04L 27/262 Reduction thereof by selection of pilot symbols
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• 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 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Aspects of the disclosure relate to synchronization signaling supporting multiple waveforms. A synchronization signal block (SSB) is configurable for transmission using either at least a first waveform or a second waveform, where the first waveform has higher peak to average power ratio (PAPR) characteristics such as OFDM and the second waveform has lower PAPR characteristics, such as DFT-S-OFDM. The SSB is transmitted selectively using either the first waveform or the second waveform for transmission of the SSB. Furthermore, the characteristics of the transmission such as a predetermined pattern of the first and second waveform transmissions may be utilized to communicate to a receiver the type of waveform being used. In this manner, SSB transmissions may take advantage of respective advantages afforded by each type of waveform, particularly when using higher frequency transmissions above 40 GHz in wireless communication systems.

Claims

1. A method of wireless communication, comprising:

determining within a transceiver a synchronization signal block that is configurable for transmission using at least one of a first waveform or a second waveform; and

transmitting the synchronization signal block through selectively using the first waveform or the second waveform for transmission of the synchronization signal block.

2. The method of claim 1, wherein one of the first or second waveforms includes an orthogonal frequency division multiplexed (OFDM) waveform, and the other of the first or second waveforms includes a low peak to average power ratio (PAPR) waveform having a PAPR less than the OFDM waveform.

3. The method of claim 2, wherein the low peak to average power ratio (PAPR) waveform utilizes at least one of DFT-spread OFDM (DFT-S-OFDM), interleaved DFT-spread OFDM (IFDM), or direct time-domain modulation.

4. The method of claim 1, further comprising:

transmitting synchronization signal blocks or synchronization signal burst-sets using a fixed pattern in time of transmissions of the first or second waveform.

5. The method of claim 4, wherein the fixed pattern in time includes transmission of every n^th synchronization signal block or synchronization signal burst-set use the first waveform, and a remainder of the synchronization signal block or synchronization signal burst-set transmissions in the interim periods use the second type of waveform.

6. The method of claim 1, further comprising:

indicating through the transmission of the synchronization signal block the type of waveform being selectively used for transmission of at least a portion of the synchronization signal block over time.

7. The method of claim 6, wherein indicating the type of waveform includes transmitting the synchronization signal block using at least one of predefined RF frequency bands, carrier frequencies or system bandwidths that are correlated to a waveform type.

8. The method of claim 6, wherein indicating the type of waveform includes placing the synchronization signal block in a predetermined location having at least one of time or frequency location within transmission slot locations that correlate to a particular waveform type.

9. The method of claim 6, wherein indicating the type of waveform includes using a predefined frequency-hopping pattern within a system bandwidth across multiple time-instances of the synchronization signal block transmission that correlate to a particular waveform type.

10. The method of claim 1, wherein the synchronization signal block includes a physical broadcast channel (pBCH).

11. An apparatus for wireless communication, comprising:

means for determining within a transceiver a synchronization signal block that is configurable for transmission using at least one of a first waveform or a second waveform; and

means for transmitting the synchronization signal block through selectively using the first waveform or the second waveform for transmission of the synchronization signal block.

12. The apparatus of claim 11, wherein one of the first or second waveforms includes an orthogonal frequency division multiplexed (OFDM) waveform, and the other of the first or second waveforms includes a low peak to average power ratio (PAPR) waveform having a PAPR less than the OFDM waveform.

13. The apparatus of claim 12, wherein the low peak to average power ratio (PAPR) waveform utilizes at least one of DFT-spread OFDM (DFT-S-OFDM), interleaved DFT-spread OFDM (IFDM), or direct time-domain modulation.

14. The apparatus of claim 11, further comprising:

means for transmitting the synchronization signal blocks or synchronization signal burst-set using a fixed pattern in time of transmissions of the first or second waveform.

15. The apparatus of claim 14, wherein the fixed pattern in time includes transmission of every n^th synchronization signal block or synchronization signal burst-set use the first waveform, and a remainder of the synchronization signal block or synchronization signal burst-set transmissions in the interim periods use the second type of waveform.

16. The apparatus of claim 11, further comprising:

means for indicating through the transmission of the synchronization signal block the type of waveform being selectively used for transmission of at least a portion of the synchronization signal block over time.

17. The apparatus of claim 16, wherein the means for indicating the type of waveform includes one of:

means for transmitting the synchronization signal block using at least one of predefined RF frequency bands, carrier frequencies or system bandwidths that are correlated to a waveform type;

means for placing the synchronization signal block in a predetermined location having at least one of time or frequency location within transmission slot locations that correlate to a particular waveform type;

or

means for providing a predefined frequency-hopping pattern within a system bandwidth across multiple time-instances of the synchronization signal block transmission that correlate to a particular waveform type.

18. A non-transitory computer-readable medium storing computer-executable code, comprising code for causing a computer to:

determine within a transceiver a synchronization signal block that is configurable for transmission using at least one of a first waveform or a second waveform; and

transmit the synchronization signal block through selectively using the first waveform or the second waveform for transmission of the synchronization signal block.

19. The non-transitory computer-readable medium of claim 18, wherein one of the first or second waveforms includes an orthogonal frequency division multiplexed (OFDM) waveform, and the other of the first or second waveforms includes a low peak to average power ratio (PAPR) waveform having a PAPR less than the OFDM waveform.

20. The non-transitory computer-readable medium of claim 19, wherein the low peak to average power ratio (PAPR) waveform utilizes at least one of DFT-spread OFDM (DFT-S-OFDM), interleaved DFT-spread OFDM (IFDM), or direct time-domain modulation.

21. The non-transitory computer-readable medium of claim 18, further comprising code for causing a computer to:

transmit the synchronization signal blocks or synchronization signal burst-set using a fixed pattern in time of transmissions of the first or second waveform.

22. The non-transitory computer-readable medium of claim 21, wherein the fixed pattern in time includes transmission of every n^th synchronization signal block or synchronization signal burst-set use the first waveform, and a remainder of the synchronization signal block or synchronization signal burst-set transmissions in the interim periods use the second type of waveform.

23. The non-transitory computer-readable medium of claim 18 further comprising code for causing a computer to:

indicate through the transmission of the synchronization signal block the type of waveform being selectively used for transmission of at least a portion of the synchronization signal block over time.

24. The non-transitory computer-readable medium of claim 23 wherein the code for causing a computer to indicate the type of waveform further comprises code for causing a computer to one of:

use at least one of predefined RF frequency bands, carrier frequencies or system bandwidths that are correlated to a waveform type;

place the synchronization signal block in a predetermined location having at least one of time or frequency location within transmission slot locations that correlate to a particular waveform type;

or

provide a predefined frequency-hopping pattern within a system bandwidth across multiple time-instances of the synchronization signal block transmission that correlate to a particular waveform type.

25. An apparatus for wireless communication, comprising:

a processor;

a transceiver communicatively coupled to the at least one processor; and

a memory communicatively coupled to the at least one processor,

wherein the processor is configured to;

receive a synchronization signal block or synchronization signal burst-set that is transmitted from a base station using at least one of a first waveform or a second waveform, where the transmission of the synchronization signal block or synchronization signal burst-set selectively utilized the first waveform or the second waveform for transmission of the synchronization signal block or synchronization signal burst-set; and

determine the type of waveform being selectively used for transmission of at least a portion of the synchronization signal block or synchronization signal burst-set based on a characteristic of the transmission of the synchronization signal block or synchronization signal burst-set; and

decode the synchronization signal block or synchronization signal burst-set based on the determined waveform type.

26. The apparatus of claim 25, wherein one of the first or second waveforms includes an orthogonal frequency division multiplexed (OFDM) waveform, and the other of the first or second waveforms includes a low peak to average power ratio (PAPR) waveform having a PAPR less than the OFDM waveform.

27. The apparatus of claim 26, wherein the low peak to average power ratio (PAPR) waveform utilizes at least one of DFT-spread OFDM (DFT-S-OFDM), interleaved DFT-spread OFDM (IFDM), or direct time-domain modulation.

28. The apparatus of claim 25, wherein the characteristic includes a fixed pattern in time of transmissions of the first or second waveform.

29. The apparatus of claim 25, wherein the characteristic includes use of at least one of predefined RF frequency bands, carrier frequencies or system bandwidths that are correlated to a waveform type in the transmission of the synchronization signal block or synchronization signal burst-set.

30. The apparatus of claim 25, wherein the characteristic includes placing the synchronization signal block in a predetermined location having at least one of time or frequency location within transmission slot locations that correlate to a particular waveform type.