PBCH timing and aspects of polar code design involving first scrambling of payload data and second scrambling of encoded data
PBCH design may affect timing indication in a wireless network and polar code interleaver design, among other things. Mechanisms may indicate half frame timing though de-modulation reference signal sequence initialization, de-modulation reference signal mapping order, or de-modulation reference signal resource element location. The payload of the PBCH comprises a master information block (MIB), which payload is scrambled and encoded using a polar code. After rate matching and interleaving of the polar codeword, second scrambling is applied and the data is modulated.
1. An apparatus for generating a physical broadcast channel signal, the apparatus comprising:
a processor; and
a memory coupled with the processor, the memory storing executable instructions that when executed by the processor cause the processor to effectuate operations comprising:
obtaining a physical broadcast channel, PBCH, payload;
scrambling the PBCH payload based on a first scrambler, the scrambled PBCH payload creating a first vector, wherein the first scrambler is based on a cell identifier of a base station;
polar encoding the first vector to generate a second vector;
rate matching and interleaving the second vector to generate a third vector;
scrambling the third vector based on a second scrambler, the scrambled third vector creating a fourth vector; and
generating the PBCH signal based on the fourth vector.
2. The apparatus of claim 1 , wherein the second scrambler is based on a cell identifier.
3. The apparatus of claim 1 , wherein the second scrambler is based on a cell identifier and least significant bits of a synchronization signal block index.
4. The apparatus of claim 1 , wherein the second scrambler is based on least significant bits of a synchronization signal block index.
5. The apparatus of claim 1 , wherein the second scrambler is initialized at a start of each synchronization signal block.
6. The apparatus of claim 1 , wherein the second scrambler is initialized at a start of each synchronization signal block within a synchronization signal burst.
7. A method for generating a physical broadcast channel signal, the method comprising:
obtaining a physical broadcast channel, PBCH, payload;
scrambling the PBCH payload based on a first scrambler, the scrambled PBCH payload creating a first vector, wherein the first scrambler is based on a cell identifier of a base station;
polar encoding the first vector to generate a second vector;
scrambling the second vector based on a second scrambler, the scrambled second vector creating a third vector; and
generating the PBCH signal based on the third vector.
8. The method of claim 7 , wherein the second scrambler is based on a cell identifier.
9. The method of claim 7 , wherein the second scrambler is based on a cell identifier and least significant bits of a synchronization signal block index.
10. The method of claim 7 , wherein the second scrambler is based on least significant bits of a synchronization signal block index.
11. The method of claim 7 , wherein the second scrambler is initialized at a start of each synchronization signal block.
12. The method of claim 7 , wherein the second scrambler is initialized at a start of each synchronization signal block within a synchronization signal burst.
13. A computer-readable storage medium storing computer executable instructions that when executed by a computing device cause said computing device to effectuate operations comprising:
obtaining a physical broadcast channel (PBCH) payload:
scrambling the PBCH payload based on a first scrambler, the scrambled PBCH payload creating a first vector, wherein the first scrambler is based on a cell identifier of a base station:
polar encoding the first vector to generate a second vector:
scrambling the second vector based on a second scrambler, the scrambled second vector creating a third vector; and
generating the PBCH signal based on the third vector.
14. The computer-readable storage medium of claim 13 , wherein the PBCH payload comprises synchronization signal block beam index bits.
15. The computer-readable storage medium of claim 13 , wherein the second scrambler is based on a cell identifier.
16. The computer-readable storage medium of claim 13 , wherein the second scrambler is based on a cell identifier and least significant bits of a synchronization signal block index.
17. The computer-readable storage medium of claim 13 , wherein the second scrambler is based on least significant bits of a synchronization signal block index.
18. The computer-readable storage medium of claim 13 , wherein the second scrambler is initialized at a start of each synchronization signal block.