# US 11,310,087 B2 · Downlink PPDU sending method and apparatus, and downlink PPDU receiving method and apparatus

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- Number: US 11,310,087 B2
- Document ID: US11310087B2
- Status: Granted
- Kind: B2
- Application number: 16/811,616
- Filed: 2020-03-06
- Published: 2020-07-02
- Granted: 2022-04-19
- Earliest claimed: 2017-11-03
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Ming Gan; Shimon Shilo; Leonid Epstein; Oded Redlich; Xun Yang; Tao Wu
- Web page: https://patentgrep.com/patent/US11310087B2

## CPC

- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system}
- 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 radio physical layer protocol data unit (PPDU) sending method includes: obtaining, a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates one of the following: that the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, or the quantity of OFDM symbols included in the HE-SIG-B; and sending the PPDU.

## Claims

### Claim 1

A radio physical layer protocol data unit (PPDU) sending method, comprising:
obtaining, a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and if the value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16 and determined based on station quantity information indicated by a common field in the HE-SIG-B; and
sending the PPDU.

### Claim 2 (depends on 1)

The method according to claim 1, the method further comprises:
if a value of the field is any value of 0 to 14, the quantity of OFDM symbols included in the HE-SIG B is equal to the value of the field+1.

### Claim 3 (depends on 1)

The method according to claim 1, wherein
the HE-SIG-A further includes a B22, when a value of the B22 is 0, the value of the field indicates the quantity of OFDM symbols in the HE-SIG-B, and when a value of the B22 is 1, the value of the field indicates a quantity of stations participating in multi-user multiple-input multiple-output transmission.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the field is B18-21.

### Claim 5

A radio physical layer protocol data unit (PPDU) receiving method, comprising:
receiving a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16; and
determining, based on the received PPDU, the quantity of OFDM symbols included in the HE-SIG B;
wherein if a value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and the quantity of OFDM symbols included in the HE-SIG-B is determined based on station quantity information indicated by a common field in the HE-SIG-B.

### Claim 6 (depends on 5)

The method according to claim 5, wherein
the determining, based on the received PPDU, the quantity of OFDM symbols included in the HE-SIG-B further comprises:
if a value of the filed is any value of 0 to 14, determining that the quantity of OFDM symbols in the HE-SIG-B is M, wherein M is the value of the field+1.

### Claim 7 (depends on 5)

The method according to claim 5, wherein
the HE-SIG-A includes a B22, when a value of the B22 is 0, the value of the field indicates the quantity of OFDM symbols in the HE-SIG-B, and when a value of the B22 is 1, the value of the field indicates a quantity of stations participating in multi-user multiple-input multiple-output transmission.

### Claim 8 (depends on 5)

The method according to claim 5, wherein the field is B18-21.

### Claim 9

A radio physical layer protocol data unit (PPDU) sending apparatus, comprising:
a non-transitory memory storage comprising instructions; and
one or more hardware processors in communication with the non-transitory memory storage, wherein the one or more hardware processors execute the instructions to: obtain a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), and the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and if the value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16 and determined based on station quantity information indicated by a common field in the HE-SIG-B; and
a transmitter, configured to send the PPDU.

### Claim 10 (depends on 9)

The apparatus according to claim 9, further comprises:
if a value of the field is any value of 0 to 14, the quantity of OFDM symbols included in the HE-SIG-B is equal to the value of the field+1.

### Claim 11 (depends on 9)

The apparatus according to claim 9, wherein
the HE-SIG-A further includes a B22, when a value of the B22 is 0, the value of the field indicates the quantity of OFDM symbols in the HE-SIG-B, and when a value of the B22 is 1, the value of the field indicates a quantity of stations participating in multi-user multiple-input multiple-output transmission.

### Claim 12 (depends on 9)

The sending apparatus according to claim 9, wherein the field is B18-21.

### Claim 13

A radio physical layer protocol data unit (PPDU) receiving apparatus, comprising:
a non-transitory memory storage comprising instructions; and
one or more hardware processors in communication with the non-transitory memory storage, wherein the one or more hardware processors execute the instructions to:
a receiver, configured to receive a radio physical layer protocol data unit (PPDU), wherein the PPDU includes a high efficiency-signal field A (HE-SIG-A) and a high efficiency-signal field B (HE-SIG-B), the HE-SIG-A includes a field indicating a quantity of orthogonal frequency division multiplexing (OFDM) symbols in the HE-SIG-B, and wherein a value of the field indicates whether the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16; a non-transitory memory storage comprising instructions; and
determine, based on the received PPDU, the quantity of OFDM symbols in the HE-SIG-B;
wherein if a value of the field is 15, the quantity of OFDM symbols included in the HE-SIG-B is greater than or equal to 16, and the quantity of OFDM symbols included in the HE-SIG-B is determined based on station quantity information indicated by a common field in the HE-SIG-B.

### Claim 14 (depends on 13)

The apparatus according to claim 13, wherein
the determine, based on the received PPDU, the quantity of OFDM symbols include in the HE-SIG-B further comprises:
if a value of the field is any value of 0 to 14, determine that the quantity of OFDM symbols in the HE-SIG-B is M, wherein M is the value of the field+1.

### Claim 15 (depends on 13)

The apparatus according to claim 13, wherein
the HE-SIG-A includes a B22, when a value of the B22 is 0, the value of the field indicates the quantity of OFDM symbols in the HE-SIG-B, and when a value of the B22 is 1, the value of the field indicates a quantity of stations participating in multi-user multiple-input multiple-output transmission.

### Claim 16 (depends on 13)

The receiving apparatus according to claim 13, wherein the field is B18-21.