US 2025/0158870 A1Published application

Data transmission method and apparatus in wireless local area network

AssigneeHuawei Technologies Co., Ltd.

InventorsWei Lin, Xin Xue, Ningjuan Wang, Le Liu

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Abstract

An HE-LTF transmission method is provided, including: determining, based on a total number NSTS of space-time streams, a number NHELTF of OFDM symbols included in an HE-LTF field; determining a HE-LTF sequence in frequency domain according to a transmission bandwidth and a mode of the HE-LTF field, where the HE-LTF sequence in frequency domain includes but is not limited to a mode of the HE-LTF field sequence that is in a 1× mode and that is mentioned in implementations; and sending a time-domain signal according to the number NHELTF of OFDM symbols and the determined HE-LTF sequence in frequency domain. In the foregoing solution, a PAPR value is relatively low.

Claims28

Dependent claims

A method for channel estimation information transmission, the method comprising:

determining, by an apparatus, a long training field (LTF) sequence in a frequency domain according to a transmission bandwidth (BW) and a mode of a LTF field;
and
sending, by the apparatus, a time-domain signal according to the LTF sequence in the frequency domain and a number of orthogonal frequency division multiplexing (OFDM) symbols of the LTF field;
wherein the LTF sequence in the frequency domain in a 1× LTF mode over a bandwidth that includes one or more 80 MHz channels comprises any combination of the following:
a left part of a long training field sequence of a 80 MHz channel (L-LTF80 MHz_A), a right part of the long training field sequence of the 80 MHz channel (R-LTF80 MHz_A), −L-LTF80 MHz_A, Or −R-LTF80 MHz_A;
wherein the L-LTF80 MHz_A comprises {−1, −1, +1, +1, +1, +1, +1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1} on subcarriers with every fourth index;
and
wherein the R-LTF80 MHz_A comprises {−1, +1, +1, −1, −1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1, −1, +1, +1} on subcarriers with every fourth index.

5 more elements

A method for channel estimation information processing, the method comprising:

receiving, by an apparatus, a preamble that comprises a long training field (LTF);
and
obtaining, by the apparatus, a channel estimation value of a corresponding subcarrier location according to the received LTF and a LTF sequence in a frequency domain;
wherein the LTF sequence in the frequency domain in a 1× LTF mode over a bandwidth that includes one or more 80 MHz channels comprises any combination of the following:
a left part of a long training field sequence of a 80 MHz channel (L-LTF80 MHz_A), a right part of the long training field sequence of the 80 MHz channel (R-LTF80 MHz_A), −L-LTF80 MHz_A, or −R-LTF80 MHz_A;
wherein the L-LTF80 MHz_A comprises {−1, −1, +1, +1, +1, +1, +1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1} on subcarriers with every fourth index;
and
wherein the R-LTF80 MHz_A comprises {−1, +1, +1, −1, −1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1,+1, −1, +1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1, −1, +1, +1} on subcarriers with every fourth index.

5 more elements

An apparatus, comprising:

a memory storing instructions;
and
one or more processors in communication with the memory, wherein the one or more processors execute the instructions to:
determine a long training field (LTF) sequence in a frequency domain according to a transmission bandwidth (BW) and a mode of a LTF field;
and
send a time-domain signal according to the LTF sequence in the frequency domain and a number of orthogonal frequency division multiplexing (OFDM) symbols of the LTF field;
wherein the LTF sequence in the frequency domain in a 1× LTF mode over a bandwidth that includes one or more 80 MHz channels comprises any combination of the following:
a left part of a long training field sequence of a 80 MHz channel (L-LTF80 MHz_A), a right part of the long training field sequence of the 80 MHz channel (R-LTF80 MHz_A), −L-LTF80 MHz_A, or −R-LTF80 MHz_A;
wherein the L-LTF80 MHz_A comprises {−1, −1, +1, +1, +1, +1, +1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1} on subcarriers with every fourth index;
and
wherein the R-LTF80 MHz_A comprises {−1, +1, +1, −1, −1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1, −1, +1, +1} on subcarriers with every fourth index.

8 more elements

An apparatus, comprising:

a memory storing instructions;
and
one or more processors in communication with the memory, wherein the one or more processors execute the instructions to:
receive a preamble that comprises a long training field (LTF);
and
obtain a channel estimation value of a corresponding subcarrier location according to the received LTF and a LTF sequence in a frequency domain;
wherein the LTF sequence in the frequency domain in a 1× LTF mode over a bandwidth that includes one or more 80 MHz channels comprises any combination of the following:
a left part of a long training field sequence of a 80 MHz channel (L-LTF80 MHz_A), a right part of the long training field sequence of the 80 MHz channel (R-LTF80 MHz_A), −L-LTF80 MHz_A, or −R-LTF80 MHz_A;
wherein the L-LTF80 MHz_A comprises {−1, −1, +1, +1, +1, +1, +1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1} on subcarriers with every fourth index;
and
wherein the R-LTF80 MHz_A comprises {−1, +1, +1, −1, −1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, +1, −1, +1, +1, +1, +1, +1, −1, −1, +1, +1, −1, +1, −1, +1, −1, −1, −1, −1, +1, −1, +1, −1, −1, −1, +1, +1} on subcarriers with every fourth index.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/945,320Filed 12 Nov 2024
Priority: CN 201510823977.823 Nov 2015
Published: 15 May 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04L 27/2672
Characterised by the domain of operation: frequency domain
H04L 25/022
Channel estimation: of frequency response
H04L 25/0226
Using sounding signals: sounding signals per se
H04L 27/261
Signal structure: details of reference signals

Family

Application15/987,216Continuation · filed 23 May 2018
Application16/870,570Continuation · filed 8 May 2020
Application17/246,182Continuation · filed 30 Apr 2021
Application18/309,575Continuation · filed 28 Apr 2023
Application18/945,320Continuation
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US 2025/0158870 A1This patent

From the US filing history. Foreign family members aren’t listed.

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