Synchronization signal block design
A wireless communication system utilizes a synchronization signal block (SSB) structure to enable beam switching at higher sub carrier spacing (SCS) or uplink transmissions within an SSB. The SSB structure has a first SCS for an SSB transmission and a second SCS for a data transmission. The SSB structure is based on the first SCS and the second SCS, with the SSB structure including at least one gap between SSB symbols or between SSBs. The wireless communication system transmits or receives an SSB based on the SSB structure. A base station may transmit a downlink signal during the gap, for example, where the second SCS is much greater than the first SCS. A user equipment may transmit an uplink signal such as an acknowledgment during the at least one gap. The user equipment or the base station may perform analog beam switching during the at least one gap between SSBs.
1. A method of wireless communication by a wireless communication device, comprising:
determining a first sub-carrier spacing (SCS) for a synchronization signal block (SSB) transmission and a second SCS for a data transmission, wherein the second SCS is different than the first SCS;
determining a SSB structure based on the first SCS and the second SCS, wherein the SSB structure includes a plurality of SSB transmissions, each SSB transmission comprising four SSB symbols, wherein there is at least one gap between the SSB symbols of a single SSB transmission; and
transmitting or receiving an SSB based on the SSB structure; and
transmitting or receiving at least one uplink symbol using the second SCS during the at least one gap between the SSB symbols of the single SSB transmission.
2. The method of claim 1 , wherein determining the SSB structure based on the first SCS and the second SCS comprises determining that the SSB structure includes the at least one gap when the first SCS or the second SCS is at least 120 kHz.
3. The method of claim 1 , wherein determining the SSB structure based on the first SCS and the second SCS comprises determining that the SSB structure includes the at least one gap between SSB symbols of the SSB when the first SCS is 120 kHz or 240 kHz.
4. The method of claim 3 , wherein determining the SSB structure based on the first SCS and the second SCS comprises determining that a ratio between the second SCS and the first SCS is at least 4.
5. The method of claim 3 , wherein a length of the at least one gap is a function of the first SCS and the second SCS.
6. The method of claim 5 , wherein the length of the at least one gap is at least a number of symbols of the first SCS that includes a full slot of the second SCS and time for beam and direction switching.
7. The method of claim 6 , wherein the full slot of the second SCS is not aligned with a slot boundary of the first SCS.
8. The method of claim 1 , wherein determining the SSB structure based on the first SCS and the second SCS comprises determining that the SSB structure includes the at least one gap between SSBs when the first SCS is 480 kHz or greater.
9. The method of claim 8 , further comprising performing analog beam switching during the at least one gap between SSBs.
10. The method of claim 8 , wherein the at least one gap between SSBs includes at least one gap between every pair of SSBs.
11. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine a first sub-carrier spacing (SCS) for a synchronization signal block (SSB) transmission and a second SCS for a data transmission, wherein the second SCS is different than the first SCS;
determine a SSB structure based on the first SCS and the second SCS, wherein the SSB structure includes a plurality of SSB transmissions, each SSB transmission comprising four SSB symbols, wherein there is at least one gap between the SSB symbols of a single SSB transmission;
transmit or receive an SSB based on the SSB structure; and
transmit or receive at least one uplink symbol using the second SCS during the at least one gap between the SSB symbols of the single SSB transmission.
12. The apparatus of claim 11 , wherein the at least one processor is configured to determine that the SSB structure includes the at least one gap when the first SCS or the second SCS is at least 120 kHz.
13. The apparatus of claim 11 , wherein the at least one processor is configured to determine that the SSB structure includes the at least one gap between SSB symbols of the SSB when the first SCS is 120 kHz or 240 kHz.
14. The apparatus of claim 13 , wherein the at least one processor is configured to determine that a ratio between the second SCS and the first SCS is at least 4.
15. The apparatus of claim 13 , wherein a length of the at least one gap is a function of the first SCS and the second SCS.
16. The apparatus of claim 15 , wherein the length of the at least one gap is at least a number of symbols of the first SCS that includes a full slot of the second SCS and time for beam and direction switching.
17. The apparatus of claim 16 , wherein the full slot of the second SCS is not aligned with a slot boundary of the first SCS.
18. The apparatus of claim 11 , wherein the at least one processor is configured to determine that the SSB structure includes the at least one gap between SSBs when the first SCS is 480 kHz or greater.
19. The apparatus of claim 18 , wherein the at least one processor is configured to perform analog beam switching during the at least one gap between SSBs.
20. The apparatus of claim 18 , wherein the at least one gap between SSBs includes at least one gap between every pair of SSBs.
21. An apparatus for wireless communication, comprising:
means for determining a first sub-carrier spacing (SCS) for a synchronization signal block (SSB) transmission and a second SCS for a data transmission, wherein the second SCS is different than the first SCS;
means for determining a SSB structure based on the first SCS and the second SCS, wherein the SSB structure includes a plurality of SSB transmissions, each SSB transmission comprising four SSB symbols, wherein there is at least one gap between the SSB symbols of a single SSB transmission; and
means for transmitting or receiving an SSB based on the SSB structure, wherein the means for transmitting or receiving is configured to transmit or receive at least one uplink symbol using the second SCS during the at least one gap between the SSB symbols of the single SSB transmission.
22. The apparatus of claim 21 , wherein the means for determining the SSB structure is configured to determine that the SSB structure includes the at least one gap when the first SCS or the second SCS is at least 120 kHz.
23. The apparatus of claim 21 , wherein the means for determining the SSB structure is configured to determine that the SSB structure includes the at least one gap between SSB symbols of the SSB when the first SCS is 120 kHz or 240 kHz.
24. The apparatus of claim 23 , wherein a length of the at least one gap is at least a number of symbols of the first SCS that includes a full slot of the second SCS and time for beam and direction switching.
25. The apparatus of claim 21 , wherein the means for determining the SSB structure is configured to determine that the SSB structure includes the at least one gap between SSBs when the first SCS is 480 kHz or greater.
26. The apparatus of claim 25 , further comprising means for performing analog beam switching during the at least one gap between SSBs.
27. A non-transitory computer-readable medium storing computer executable code, the code when executed by a processor cause the processor to:
determine a first sub-carrier spacing (SCS) for a synchronization signal block (SSB) transmission and a second SCS for a data transmission, wherein the second SCS is different than the first SCS;
determine a SSB structure based on the first SCS and the second SCS, wherein the SSB structure includes a plurality of SSB transmissions, each SSB transmission comprising four SSB symbols, wherein there is at least one gap between the SSB symbols of a single SSB transmission;
transmit or receive an SSB based on the SSB structure; and
transmit or receive at least one uplink symbol using the second SCS during the at least one gap between the SSB symbols of the single SSB transmission.