Method and apparatus for transmitting PBCH and method and apparatus for receiving PBCH
In a wireless communication system, a physical broadcast channel (PBCH) is encoded based on a Polar code and then is transmitted. Half-frame information within the PBCH is mapped to a bit position 247 among bit positions of the Polar code and synchronization signal and PBCH block (SSB) index information within the PBCH is mapped to bit positions 253, 254, and 255 of the Polar code.
1. A method of transmitting a physical broadcast channel (PBCH) by a transmitting device in a wireless communication system, the method comprising:
mapping information for the PBCH to input bit positions of a Polar code of size N=512, based on a Polar sequence;
encoding the information based on the Polar code; and
transmitting the PBCH including the information encoded based on the Polar code,
wherein the information for the PBCH includes (i) half-frame information and (ii) synchronization signal and PBCH block (SSB) index information,
wherein the half-frame information is 1 bit and is mapped to input bit position 247 among input bit positions 0 to 511 of the Polar code based on the Polar sequence, and
wherein the SSB index information is 3 bits and is mapped to input bit positions 253, 254, and 255 among the input bit positions 0 to 511 of the Polar code based on the Polar sequence.
2. The method according to claim 1 , wherein a total payload size of the PBCH including the information is 56 bits.
3. The method according to claim 1 , wherein the Polar sequence includes a sequence with bit indexes 0 to 511 that arranges the input bit positions 0 to 511 of the Polar code in ascending order of reliability.
4. The method according to claim 1 , wherein the information for the PBCH includes a system frame number (SFN) for a frame to which the PBCH belongs, and
wherein mapping the information for the PBCH to input bit positions of the Polar code further comprises mapping the second and third least significant bits of the SFN to input bit positions 441 and 469 of the Polar code, respectively, and mapping the other 8 bits of the SFN to input bit positions 367, 375, 415, 444, 470, 473, 483 and 485 of the Polar code.
5. A method of receiving a physical broadcast channel (PBCH) by a receiving device in a wireless communication system, the method comprising:
receiving the PBCH; and
decoding information within the PBCH based on a Polar code of size N=512,
wherein the information within the PBCH is decoded based on a mapping relationship between the information and input bit positions of the Polar code,
wherein the information within the PBCH includes (i) half-frame information and (ii) synchronization signal and PBCH block (SSB) index information,
wherein the half-frame information is one bit, and the SSB index information is 3 bits, and
wherein the mapping relationship includes: mapping the half-frame information to input bit position 247 among input bit positions 0 to 511 of the Polar code, and mapping the SSB index information to input bit positions 253, 254, and 255 among the input bit positions 0 to 511 of the Polar code.
6. The method according to claim 5 , wherein a total payload size of the PBCH including the information is 56 bits.
7. The method according to claim 5 , wherein the Polar sequence includes a sequence with bit indexes 0 to 511 that arranges the input bit positions 0 to 511 of the Polar code in ascending order of reliability.
8. The method according to claim 5 , wherein the information within the PBCH includes a system frame number (SFN) for a frame to which the PBCH belongs, and
wherein the mapping relationship further includes: mapping the second and third least significant bits of the SFN to input bit positions 441 and 469 of the Polar code, respectively, and mapping the other 8 bits of the SFN to bit positions 367, 375, 415, 444, 470, 473, 483 and 485 of the Polar code.
9. A transmitting device configured to transmit a physical broadcast channel (PBCH) in a wireless communication system, the transmitting device comprising,
a transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
mapping information for the PBCH to input bit positions of a Polar code of size N=512, based on a Polar sequence;
encoding the information based on the Polar code; and
transmitting, through the transceiver, the PBCH including the information encoded based on the Polar code,
wherein the information for the PBCH includes (i) half-frame information and (ii) synchronization signal and PBCH block (SSB) index information,
wherein the half-frame information is one bit and is mapped to input bit position 247 among bit positions 0 to 511 of the Polar code, and
wherein the SSB index information is 3 bits and is mapped to input bit positions 253, 254, and 255 of the Polar code.
10. The transmitting device according to claim 9 ,
wherein a total payload size of the PBCH including the information is 56 bits.
11. The transmitting device according to claim 9 ,
wherein the Polar sequence includes a sequence with bit indexes 0 to 511 that arranges the input bit positions 0 to 511 of the Polar code in ascending order of reliability.
12. The transmitting device according to claim 9 ,
wherein the information includes a system frame number (SNF) for a frame to which the PBCH belongs, and
wherein mapping the information for the PBCH to input bit positions of the Polar code further comprises mapping the second and third least significant bits of the SFN to input bit positions 441 and 469 of the Polar code, respectively, and mapping the other 8 bits of the SFN to bit positions 367, 375, 415, 444, 470, 473, 483 and 485 of the Polar code.
13. A receiving device configured to receive a physical broadcast channel (PBCH) in a wireless communication system, the receiving device comprising,
a transceiver;
at least one processor; and
at least one computer operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
receiving, through the transceiver, the PBCH; and
decoding information within the PBCH based on a Polar code of size N=512,
wherein the information within the PBCH is decoded based on a mapping relationship between the information and input bit positions of the Polar code,
wherein the information within the PBCH includes (i) half-frame information and (ii) synchronization signal and PBCH block (SSB) index information,
wherein the half-frame information is one bit, and the SSB index information is 3 bits, and
wherein the mapping relationship includes: mapping the half-frame information to input bit position 247 among bit positions 0 to 511 of the Polar code, and mapping the SSB index information to input bit positions 253, 254, and 255 among the input bit positions 0 to 511 of the Polar code.
14. The receiving device according to claim 13 , wherein a total payload size of the PBCH including the information is 56 bits.
15. The receiving device according to claim 13 , wherein the information within the PBCH includes a system frame number (SFN) for a frame to which the PBCH belongs, and
wherein the mapping relationship further includes: mapping the second and third least significant bits of the SFN to bit positions 441 and 469 of the Polar code, respectively, and mapping the other 8 bits of the SFN to bit positions 367, 375, 415, 444, 470, 473, 483 and 485 of the Polar code.