SHARED SPECTRUM SYNCHRONIZATION DESIGN

• US 20190037481A1
• Filed: 07/23/2018
• Published: 01/31/2019
• Est. Priority Date: 07/25/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: ZHANG, Xiaoxia, WEI, Yongbin, KADOUS, Tamer, LUO, Tao, SUN, Jing
• Granted Patent: US 11,064,424 B2
• Time in Patent Office: Days
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04J 11/0076 Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

Methods, systems, and devices for wireless communication are described. A base station may perform a Listen-Before-Talk (LBT) procedure to obtain access to a wireless communication channel. The base station may then determine a pattern of synchronization signal block (SSB) transmissions based on an outcome of the LBT procedure and transmit the pattern of SSB transmissions after obtaining access to the wireless communication channel. The outcome of the LBT procedure may include obtaining access to the wireless communication channel after a missed opportunity for at least one SSB transmission in a discovery reference signal (DRS) measurement timing configuration (DMTC) window. A user equipment (UE) may determine system timing based on a received SSB transmission.

Claims

1. A method comprising:

performing a Listen-Before-Talk (LBT) procedure to obtain access to a wireless communication channel;

determining a pattern of synchronization signal block (SSB) transmissions based on an outcome of the LBT procedure; and

transmitting the pattern of SSB transmissions after obtaining access to the wireless communication channel.

2. The method of claim 1, wherein the outcome of the LBT procedure includes obtaining access to the wireless communication channel after a missed opportunity for at least one SSB transmission in a discovery reference signal (DRS) measurement timing configuration (DMTC) window.

3. The method of claim 2, wherein the determining the pattern includes dropping the at least one SSB transmission from the pattern.

4. The method of claim 3, wherein the pattern includes at least one SSB transmission of at least one remaining opportunity for SSB transmissions in the DMTC window.

5. The method of claim 2, wherein the pattern includes the at least one SSB transmission associated with the missed opportunity after an SSB transmission of at least one remaining opportunity for SSB transmissions in the DMTC window.

6. The method of claim 5, further comprising transmitting a wrap around index to a user equipment (UE).

7. The method of claim 6, wherein the wrap around index is transmitted in a Physical Broadcast Channel (PBCH).

8. The method of claim 6, wherein the wrap around index is transmitted in unused resource elements of at least one symbol on which a primary synchronization signal (PSS) or secondary synchronization signal (SSS) is transmitted.

9. The method of claim 2, wherein the transmitting includes transmitting SSB transmissions according to the pattern at a first available SSB transmission opportunity after the missed opportunity.

10. The method of claim 9, further comprising transmitting a timing offset to a user equipment (UE).

11. The method of claim 10, where the timing offset indicates the timing offset between the first available SSB transmission opportunity and a starting boundary of the DMTC window.

12. The method of claim 10, wherein the timing offset is transmitted in a Physical Broadcast Channel (PBCH).

13. The method of claim 10, wherein the timing offset is transmitted in unused resource elements of at least one symbol on which a primary synchronization signal (PSS) or secondary synchronization signal (SSS) is transmitted.

14. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

perform a Listen-Before-Talk (LBT) procedure to obtain access to a wireless communication channel;

determine a pattern of synchronization signal block (SSB) transmissions based on an outcome of the LBT procedure; and

transmit the pattern of SSB transmissions after obtaining access to the wireless communication channel.

15. The apparatus of claim 14, wherein the outcome of the LBT procedure includes obtaining access to the wireless communication channel after a missed opportunity for at least one SSB transmission in a discovery reference signal (DRS) measurement timing configuration (DMTC) window.

16. The apparatus of claim 15, wherein the pattern includes the at least one SSB transmission associated with the missed opportunity after an SSB transmission of at least one remaining opportunity for SSB transmissions in the DMTC window.

17. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to transmit a wrap around index to a user equipment (UE).

18. The apparatus of claim 17, wherein the wrap around index is transmitted in a Physical Broadcast Channel (PBCH).

19. The apparatus of claim 17, wherein the wrap around index is transmitted in unused resource elements of at least one symbol on which a primary synchronization signal (PSS) or secondary synchronization signal (SSS) is transmitted.

20. The apparatus of claim 15, wherein the transmitting includes transmitting SSB transmissions according to the pattern at a first available SSB transmission opportunity after the missed opportunity.

21. The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to transmit a timing offset to a user equipment (UE).

22. The apparatus of claim 21, where the timing offset indicates the timing offset between the first available SSB transmission opportunity and a starting boundary of the DMTC window.

23. The apparatus of claim 21, wherein the timing offset is transmitted in a Physical Broadcast Channel (PBCH).

24. The apparatus of claim 21, wherein the timing offset is transmitted in unused resource elements of at least one symbol on which a primary synchronization signal (PSS) or secondary synchronization signal (SSS) is transmitted.

25. A method comprising:

receiving at least one synchronization signal block (SSB) transmission from a base station; and

determining a system timing based on the at least one SSB transmission.

26. The method of claim 25, further comprising receiving a wrap around index from the base station and determining the system timing based on the wrap around index in addition to the received at least one SSB transmission.

27. The method of claim 25, further comprising receiving a timing offset from the base station and determining the system timing based on the timing offset in addition to the received at least one SSB transmission.

28. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

receive at least one synchronization signal block (SSB) transmission from a base station; and

determine a system timing based on the at least one SSB transmission.

29. The apparatus of claim 28, wherein the instructions are further operable to cause the apparatus to receive a wrap around index from the base station and determine the system timing based on the wrap around index in addition to the received at least one SSB transmission.

30. The apparatus of claim 28, wherein the instructions are further operable to cause the apparatus to receive a timing offset from the base station and determine the system timing based on the timing offset in addition to the received at least one SSB transmission.