Synchronization signal for a broadcast channel
An apparatus is provided for wireless communication at a base station with improved PBCH construction and decoding. The base station apparatus constructs a PBCH payload, wherein a bit location is selected for encoding a plurality of bits of the PBCH based on an estimated reliability for the corresponding bits location wherein the plurality of bits comprises frozen bits, unknown bits that are unknown to a user equipment, and potentially known bits that are potentially known by the user equipment. The apparatus transmits the PBCH payload in at least one of a plurality of SS blocks. A UE receiving the PBCH decodes the PBCH based on a successive decoding order. The successive decoding order may be based on an estimated reliability for the corresponding bits, e.g., in which potentially known bits are decoded prior to unknown bits.
1. A method of wireless communication at a user equipment (UE) served by a first cell, comprising:
receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
receiving, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality;
detecting the cell ID of the second cell from a received SS block; and
decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
2. The method of claim 1 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
3. The method of claim 1 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
4. The method of claim 1 , wherein the PBCH payload comprises a polar coded PBCH.
5. A method of wireless communication at a user equipment (UE) served by a first cell, comprising:
receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
detecting a cell identifier (ID) of the second cell from a received SS block;
reporting the cell ID of the second cell to the first cell;
receiving, from the first cell, a plurality of potentially known bits corresponding to the cell ID for the second cell in response to the reporting the cell ID; and
decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
6. The method of claim 5 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
7. The method of claim 5 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
8. The method of claim 5 , wherein the PBCH payload comprises a polar coded PBCH.
9. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising:
means for receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
means for receiving, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality;
means for detecting a cell ID of the second cell from a received SS block; and
means for decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
10. The apparatus of claim 9 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
11. The apparatus of claim 9 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
12. The apparatus of claim 9 , wherein the PBCH payload comprises a polar coded PBCH.
13. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising:
means for receiving a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
means for detecting a cell identifier (ID) of the second cell from a received SS block;
means for reporting the cell ID of the second cell to the first cell;
means for receiving, from the first cell, a plurality of potentially known bits corresponding to the cell ID for the second cell in response to the reporting the cell ID; and
means for decoding the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
14. The apparatus of claim 13 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
15. The apparatus of claim 13 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
16. The apparatus of claim 13 , wherein the PBCH payload comprises a polar coded PBCH.
17. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
receive, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality;
detect a cell ID of the second cell from a received SS block; and
decode the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
18. The apparatus of claim 17 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
19. The apparatus of claim 17 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
20. The apparatus of claim 17 , wherein the PBCH payload comprises a polar coded PBCH.
21. An apparatus for wireless communication at a user equipment (UE) served by a first cell, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
detect a cell identifier (ID) of the second cell from a received SS block;
report the cell ID of the second cell to the first cell;
receive, from the first cell, a plurality of potentially known bits corresponding to the cell ID for the second cell in response to the reporting the cell ID; and
decode the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
22. The apparatus of claim 21 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
23. The apparatus of claim 21 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
24. The apparatus of claim 21 wherein the PBCH payload comprises a polar coded PBCH.
25. A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE) served by a first cell, comprising code to:
receive a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
receive, from the first cell, a plurality of potentially known bits corresponding to a cell identifier (ID) for the second cell prior to reporting a cell quality;
detect a cell ID of the second cell from a received SS block; and
decode the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
26. The computer-readable medium of claim 25 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
27. The computer-readable medium of claim 25 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
28. The computer-readable medium of claim 25 , wherein the PBCH payload comprises a polar coded PBCH.
29. A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE) served by a first cell, comprising code to:
receive a physical broadcast channel (PBCH) payload of a second cell in at least one of a plurality of synchronization signal (SS) blocks, wherein each SS block comprises corresponding timing information, and wherein the PBCH payload comprises frozen bits, unknown bits that are unknown to the UE, and potentially known bits that are potentially known by the UE, wherein the potentially known bits comprise at least a part of the timing information;
detect a cell identifier (ID) of the second cell from a received SS block;
report the cell ID of the second cell to the first cell;
receive, from the first cell, a plurality of potentially known bits corresponding to the cell ID for the second cell in response to the reporting the cell ID; and
decode the PBCH payload based on a successive decoding order using the plurality of potentially known bits received from the first cell, wherein the potentially known bits are decoded prior to the unknown bits.
30. The computer-readable medium of claim 29 , wherein the successive decoding order is based on an estimated reliability for corresponding bits.
31. The computer-readable medium of claim 29 , wherein the potentially known bits further comprise system information provided to the UE by the first cell.
32. The computer-readable medium of claim 29 , wherein the PBCH payload comprises a polar coded PBCH.