# US 12,003,454 B2 · Signal field indication method and apparatus

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- Number: US 12,003,454 B2
- Document ID: US12003454B2
- Status: Granted
- Kind: B2
- Application number: 17/144,476
- Filed: 2021-01-08
- Published: 2021-05-06
- Granted: 2024-06-04
- Earliest claimed: 2018-07-09
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Jian Yu; Oded Redlich; Leonid Epstein; Shimon Shilo; Genadiy Tsodik; Yanchun Li
- Web page: https://patentgrep.com/patent/US12003454B2

## CPC

- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 69/323: in the physical layer [OSI layer 1]
- H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04W 80/02: Data link layer protocols
- H04L 5/0005: {Time-frequency}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

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.

## Claims

### Claim 1

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:
generate a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field comprising a first field indicating a number of EHT-SIG-A symbols and a second field indicating the PPDU is an extremely high throughput (EHT) PPDU; and
send the PPDU.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein the signal field is located after a legacy signal field (L-SIG) field and before an EHT-SIG-A field in the PPDU.

### Claim 3 (depends on 1)

The apparatus 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.

### Claim 4 (depends on 1)

The apparatus according to claim 1, 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; 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.

### Claim 5 (depends on 4)

The apparatus according to claim 4, wherein when the number of the EHT-SIG-A symbols is X1+ΔX, the first X1 symbols of the EHT-SIG-A field comprise the 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.

### Claim 6 (depends on 1)

The apparatus according to claim 1, wherein the signal field further comprises a cyclic redundancy code (CRC) field.

### Claim 7 (depends on 1)

The apparatus according to claim 1, wherein an EHT-SIG-A field is transmitted in a basic unit of 80 MHz.

### Claim 8

A method, comprising:
generating a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field comprising a first field indicating a number of EHT-SIG-A symbols and a second field indicating the PPDU is an extremely high throughput (EHT) PPDU; and
sending the PPDU.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the signal field is located after a legacy signal (L-SIG) field and before a EHT-SIG-A field in the PPDU.

### Claim 10 (depends on 8)

The method 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.

### Claim 11 (depends on 8)

The method according to claim 8, 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; 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.

### Claim 12 (depends on 8)

The method according to claim 8,
wherein when the number of EHT-SIG-A symbols is Xi+ΔX, first Xi symbols of an EHT-SIG-A first 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 Xi symbols are accurate, and the first tail bit is used by a receive end to terminate decoding of the first Xi symbols;
remaining ΔX symbols of an 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.

### Claim 13 (depends on 8)

The method according to claim 8, wherein the signal field further comprises a cyclic redundancy code (CRC) field.

### Claim 14 (depends on 8)

The method according to claim 8, wherein an EHT-SIG-A field is transmitted in a basic unit of 80 MHz.

### Claim 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:
generating a physical layer protocol data unit (PPDU), wherein the PPDU comprises a signal field comprising a first field indicating a number of EHT-SIG-A symbols and a second field indicating the PPDU is an extremely high throughput (EHT) PPDU; and
sending the PPDU.

### Claim 16 (depends on 15)

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.

### Claim 17 (depends on 15)

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.

### Claim 18 (depends on 15)

The non-transitory computer-readable media according to claim 15,
wherein the first field indicating the number of the EHT-SIG symbols is an additional symbol indication field comprised in first X1 symbols of the EHT-SIG-A field; 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.

### Claim 19 (depends on 15)

The non-transitory computer-readable media according to claim 15, wherein the signal field further comprises a cyclic redundancy code (CRC) field.

### Claim 20 (depends on 15)

The non-transitory computer-readable media according to claim 15, wherein an EHT-SIG-A field is transmitted in a basic unit of 80 MHz.