Techniques for determining a channel estimation for a physical broadcast channel symbol of a synchronization signal block with time division multiplexed symbols
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, via a single carrier communication, a synchronization signal block (SSB) with time division multiplexed symbols that include a physical broadcast channel (PBCH) symbol and one or more of a primary synchronization signal (PSS) symbol, a secondary synchronization signal (SSS) symbol, or a demodulation reference signal (DMRS) symbol. The UE may demodulate the PBCH symbol using a channel estimation for the PBCH symbol that is based at least in part on one or more channel estimations of the PSS symbol, the SSS symbol, or the DMRS symbol. Numerous other aspects are described.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, via a single carrier communication, a synchronization signal block (SSB) with time division multiplexed symbols that include a first symbol, a second symbol, a physical broadcast channel (PBCH) symbol between the first symbol and the second symbol in time, and a beam switching gap within the SSB, each symbol of the first symbol and the second symbol comprising a primary synchronization signal (PSS) symbol, a secondary synchronization signal (SSS) symbol, or a demodulation reference signal (DMRS) symbol; and
demodulating the PBCH symbol using a channel estimation and a frequency offset estimation for the PBCH symbol, wherein:
the channel estimation for the PBCH symbol is based at least in part on a time domain interpolation of a channel estimation of the first symbol and the second symbol, and
the frequency offset estimation for the PBCH symbol is based at least in part on a frequency offset estimation for the first symbol or the second symbol.
2. The method of claim 1 , wherein the first symbol is a DMRS symbol and the second symbol is an SSS symbol.
3. The method of claim 1 , wherein the first symbol is a first SSS symbol and the second symbol is a second SSS symbol.
4. The method of claim 3 , further comprising:
determining a cell identification (ID) associated with the SSB based at least in part on a sequence detected in the first SSS symbol, or
determining a cell ID associated with the SSB based at least in part on a first sequence detected in the first SSS symbol and a second sequence detected in the second SSS symbol.
5. The method of claim 1 , wherein the first symbol is a PSS symbol and the second symbol is an SSS symbol or a DMRS symbol.
6. The method of claim 1 , wherein one more reference signals, of the first symbol and the second symbol, that are used to determine the channel estimation for the PBCH symbol have a same bandwidth as the PBCH.
7. The method of claim 1 , wherein the SSB indicates an SSB index based at least in part on:
a sequence of one or more of a PSS symbol or an SSS symbol, or
an indication within the PBCH symbol.
8. The method of claim 1 , wherein the SSB includes the beam switching gap after the PBCH, the first symbol, and the second symbol.
9. The method of claim 1 , further comprising:
determining the frequency offset estimation for the PBCH symbol based at least in part on measurement of one or more of the first symbol or the second symbol.
10. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors configured to:
receive, via a single carrier communication, a synchronization signal block (SSB) with time division multiplexed symbols that include a first symbol, a second symbol, a physical broadcast channel (PBCH) symbol between the first symbol and the second symbol in time, and a beam switching gap within the SSB, each symbol of the first symbol and the second symbol comprising a primary synchronization signal (PSS) symbol, a secondary synchronization signal (SSS) symbol, or a demodulation reference signal (DMRS) symbol; and
demodulate the PBCH symbol using a channel estimation and a frequency offset estimation for the PBCH symbol, wherein:
the channel estimation for the PBCH symbol is based at least in part on a time domain interpolation of a channel estimation of the first symbol and the second symbol, and
the frequency offset estimation for the PBCH symbol is based at least in part on a frequency offset estimation for the first symbol or the second symbol.
11. The UE of claim 10 , wherein the first symbol is a DMRS symbol and the second symbol is an SSS symbol.
12. The UE of claim 10 , wherein the first symbol is a first SSS symbol and the second symbol is a second SSS symbol.
13. The UE of claim 12 , wherein the one or more processors are further configured to:
determine a cell identification (ID) associated with the SSB based at least in part on a sequence detected in the first SSS symbol, or
determine a cell ID associated with the SSB based at least in part on a first sequence detected in the first SSS symbol and a second sequence detected in the second SSS symbol.
14. The UE of claim 10 , wherein the first symbol is a PSS symbol and the second symbol is an SSS symbol or a DMRS symbol.
15. The UE of claim 10 , wherein one more reference signals, of the first symbol and the second symbol, that are used to determine the channel estimation for the PBCH symbol have a same bandwidth as the PBCH.
16. The UE of claim 10 , wherein the SSB indicates an SSB index based at least in part on:
a sequence of one or more of a PSS symbol or an SSS symbol, or
an indication within the PBCH symbol.
17. The UE of claim 10 , wherein the SSB includes a beam switching gap after the PBCH, the first symbol, and the second symbol.
18. The UE of claim 10 , wherein the one or more processors are further configured to:
determine the frequency offset estimation for the PBCH symbol based at least in part on measurement of one or more of the first symbol or the second symbol.
19. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
receive, via a single carrier communication, a synchronization signal block (SSB) with time division multiplexed symbols that include a first symbol, a second symbol, a physical broadcast channel (PBCH) symbol between the first symbol and the second symbol in time, and a beam switching gap within the SSB, each symbol of the first symbol and the second symbol comprising a primary synchronization signal (PSS) symbol, a secondary synchronization signal (SSS) symbol, or a demodulation reference signal (DMRS) symbol; and
demodulate the PBCH symbol using a channel estimation and a frequency offset estimation for the PBCH symbol, wherein:
the channel estimation for the PBCH symbol is based at least in part on a time domain interpolation of a channel estimation of the first symbol and the second symbol, and
the frequency offset estimation for the PBCH symbol is based at least in part on a frequency offset estimation for the first symbol or the second symbol.
20. The non-transitory computer-readable medium of claim 19 , wherein the SSB indicates an SSB index based at least in part on:
a sequence of one or more of a PSS symbol or an SSS symbol, or
an indication within the PBCH symbol.
21. The non-transitory computer-readable medium of claim 19 , wherein the SSB includes a beam switching gap after the PBCH, the first symbol, and the second symbol.
22. An apparatus for wireless communication, comprising:
means for receiving, via a single carrier communication, a synchronization signal block (SSB) with time division multiplexed symbols that include a first symbol, a second symbol, a physical broadcast channel (PBCH) symbol between the first symbol and the second symbol in time, and a beam switching gap within the SSB, each symbol of the first symbol and the second symbol comprising a primary synchronization signal (PSS) symbol, a secondary synchronization signal (SSS) symbol, or a demodulation reference signal (DMRS) symbol; and
means for demodulating the PBCH symbol using a channel estimation and a frequency offset estimation for the PBCH symbol, wherein:
the channel estimation for the PBCH symbol is based at least in part on a time domain interpolation of a channel estimation of the first symbol and the second symbol, and
the frequency offset estimation for the PBCH symbol is based at least in part on a frequency offset estimation for the first symbol or the second symbol.
23. The apparatus of claim 22 , wherein the SSB indicates an SSB index based at least in part on:
a sequence of one or more of a PSS symbol or an SSS symbol, or
an indication within the PBCH symbol.
24. The apparatus of claim 22 , wherein the SSB includes a beam switching gap after the PBCH, the first symbol, and the second symbol.
25. The non-transitory computer-readable medium of claim 19 , wherein the first symbol is a DMRS symbol and the second symbol is an SSS symbol.
26. The non-transitory computer-readable medium of claim 19 , wherein the first symbol is a first SSS symbol and the second symbol is a second SSS symbol.
27. The non-transitory computer-readable medium of claim 19 , wherein the first symbol is a PSS symbol and the second symbol is an SSS symbol or a DMRS symbol.
28. The apparatus of claim 22 , wherein the first symbol is a DMRS symbol and the second symbol is an SSS symbol.
29. The apparatus of claim 22 , wherein the first symbol is a first SSS symbol and the second symbol is a second SSS symbol.
30. The apparatus of claim 22 , wherein the first symbol is a PSS symbol and the second symbol is an SSS symbol or a DMRS symbol.