Signal field indication method and apparatus
A signal field indication method and apparatus are provided. The method includes: generating, by a transmit end, a PPDU, where the PPDU includes a SIG-A indication field, and the SIG-A indication field includes at least one of a field used to indicate a number of SIG-A information symbols and a field used to indicate a SIG-A information bandwidth; and sending, by the transmit end, the PPDU. According to the method provided in this application, the transmit end may indicate different numbers of SIG-A information symbols and/or different SIG-A information bandwidths.
1. A method, comprising:
receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field comprising a first field indicating a number of extremely high throughput (EHT)-signal (SIG)-A (EHT-SIG-A) symbols and a second field indicating the PPDU is an EHT PPDU; and
reading the signal field.
2. The method according to claim 1 , wherein the signal field is located after a legacy signal (L-SIG) field and before a EHT-SIG-A field in the PPDU.
3. The method according to claim 1 , wherein the signal field further comprises a third field indicating a modulation and coding scheme (MCS) of an EHT-SIG-A field.
4. The method according to claim 1 , wherein the first field indicating the number of EHT-SIG-A symbols is an additional symbol indication field comprised in first X1 symbols of an EHT-SIG-A field of the PPDU; and
wherein the additional symbol indication field indicates a difference ΔX between the number of EHT-SIG-A symbols and X1, a number of values of ΔX is K, and the K values of ΔX are in a one-to-one correspondence with K numbers of EHT-SIG-A symbols, wherein when ΔX=0, the number of EHT-SIG-A symbols is X1, and when ΔX is a positive integer, the number of EHT-SIG-A symbols is X1+ΔX, and both X1 and K are positive integers.
5. The method according to claim 1 , wherein when the number of EHT-SIG-A symbols is X1+ΔX, first X1 symbols of an EHT-SIG-A field comprise an additional symbol indication field, a first cyclic redundancy code (CRC), and a first tail bit, the first CRC is used to check whether the first X1 symbols are accurate, and the first tail bit is used by a receive end to terminate decoding of the first X1 symbols; remaining ΔX symbols of the EHT-SIG-A field comprise a second CRC and a second tail bit; and the second CRC is used to check whether the ΔX symbols are accurate, and the second tail bit is used by the receive end to terminate decoding of the EHT-SIG-A field.
6. The method according to claim 1 , wherein the signal field further comprises a cyclic redundancy code (CRC) field.
7. The method according to claim 1 , wherein an EHT-SIG-A field of the PPDU is transmitted in a basic unit of 80 MHz.
8. An apparatus, comprising:
a memory storing program instructions that are executable by at least one processor; and
the at least one processor coupled to the memory, the at least one processor being configured to execute the instructions to:
receive a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field comprising a first field indicating a number of extremely high throughput (EHT)-signal (SIG)-A (EHT-SIG-A) symbols and a second field indicating the PPDU is an EHT PPDU; and
read the signal field.
9. The apparatus according to claim 8 , wherein the signal field is located after a legacy signal field (L-SIG) field and before an EHT-SIG-A field in the PPDU.
10. The apparatus according to claim 8 , wherein the signal field further comprises a third field indicating a modulation and coding scheme (MCS) of an EHT-SIG-A field.
11. The apparatus according to claim 8 , wherein the first field indicating the number of the EHT-SIG-A symbols is an additional symbol indication field comprised in first X1 symbols of an EHT-SIG-A field of the PPDU; and
wherein the additional symbol indication field indicates a difference ΔX between the number of the EHT-SIG-A symbols and X1, ΔX has a value in K values, and the K values are in a one-to-one correspondence with K numbers of EHT-SIG-A symbols, wherein when ΔX=0, ΔX corresponds to X1 EHT-SIG-A symbols, and when ΔX is a positive integer, ΔX corresponds to X1+ΔX EHT-SIG-A symbols, and both X1 and K are positive integers.
12. The apparatus according to claim 8 , wherein when the number of the EHT-SIG-A symbols is X1+ΔX, a first X1 symbols of an EHT-SIG-A field comprise an additional symbol indication field, a first cyclic redundancy code (CRC), and a first tail bit, the first CRC is used to check whether the first X1 symbols are accurate, and the first tail bit is used by a receive end to terminate decoding of the first X1 symbols; remaining ΔX symbols of the EHT-SIG-A field comprise a second CRC and a second tail bit; and the second CRC is used to check whether the ΔX symbols are accurate, and the second tail bit is used by the receive end to terminate decoding of the EHT-SIG-A field.
13. The apparatus according to claim 8 , wherein the signal field further comprises a cyclic redundancy code (CRC) field.
14. The apparatus according to claim 8 , wherein an EHT-SIG-A field of the PPDU is transmitted in a basic unit of 80 MHz.
15. A non-transitory computer-readable media storing computer instructions that when executed by one or more processors, cause an apparatus to perform steps of:
receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field comprising a first field indicating a number of extremely high throughput (EHT)-signal (SIG)-A (EHT-SIG-A) symbols and a second field indicating the PPDU is an EHT PPDU; and
reading the signal field.
16. The non-transitory computer-readable media according to claim 15 , wherein the signal field is located after a legacy signal field (L-SIG) field and before an EHT-SIG-A field in the PPDU.
17. The non-transitory computer-readable media according to claim 15 , wherein the signal field further comprises a third field indicating a modulation and coding scheme (MCS) of an EHT-SIG-A field.
18. The non-transitory computer-readable media according to claim 15 , wherein the first field indicating the number of the EHT-SIG-A symbols is an additional symbol indication field comprised in first X1 symbols of an EHT-SIG-A field of the PPDU; and
wherein the additional symbol indication field indicates a difference ΔX between the number of the EHT-SIG-A symbols and X1, ΔX has a value in K values, and the K values are in a one-to-one correspondence with K numbers of EHT-SIG-A symbols, wherein when ΔX=0, ΔX corresponds to X1 EHT-SIG-A symbols, and when ΔX is a positive integer, ΔX corresponds to X1+ΔX EHT-SIG-A symbols, and both X1 and K are positive integers.
19. The non-transitory computer-readable media according to claim 15 , wherein the signal field further comprises a cyclic redundancy code (CRC) field.
20. The non-transitory computer-readable media according to claim 15 , wherein an EHT-SIG-A field of the PPDU is transmitted in a basic unit of 80 MHz.