Method for transmitting HE-LTF sequence and apparatus

Patent metadata

Field	Value
Publication number	US-11265873-B2
Application number	US-201916694695-A
Country	US
Kind code	B2
Filing date	Nov 25, 2019
Priority date	Aug 26, 2015
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

Embodiments of the present invention provide several long training sequences that are in a wireless local area network and that comply with 802.11 ax.

First claim

The invention claimed is:

1. A wireless communication method performed by an apparatus in a wireless local area network (WLAN), wherein a tone plan in the WLAN comprises sizes and locations of different resource units (RUs) in a bandwidth, the RUs comprises multiple 26-RUs and large RUs, wherein the large RU comprises at least two 26-RUs, the method comprising:
processing comprising generating and transmitting a long training sequence according to a bandwidth and a RU location and a RU size of an allocated RU in the bandwidth for channel estimation, or,
processing comprising receiving a data packet and obtaining a long training sequence as a reference sequence to perform channel estimation for the data packet, according to a bandwidth of the data packet and a RU location and a RU size of an allocated RU in the bandwidth; and
wherein the long training sequence comprises a basic long training sequence associate with a mode of the long training sequence and the length of 26-RUs, wherein the basic long training sequence comprises a first basic long training sequence G a corresponding to a first location of a first 26-RU, or, a second basic long training sequence G b corresponding to a second location of a second 26-RU, wherein the basic long training sequence further comprises G a , −G a , G b , or −G b corresponding to a third location of a third 26-RU.

2. The method according to claim 1 , wherein the tone plan further comprises a quantity and location of leftover tones between the at least two 26-RUs in the large RU,
wherein a long training sequence corresponding to the large RU further comprises +1 or −1 on the leftover tones besides the basic long training sequences respectively corresponding to the at least two 26-RUs.

3. The method according to claim 1 , wherein in a 2× mode, the basic long training sequence corresponding to the 26-RU comprises 13 values on half of the 26 subcarriers in the 26-RU respectively, wherein in a 4× mode, the basic long training sequence corresponding to the 26-RU comprises 26 values on the 26 subcarriers in the 26-RU respectively.

4. The method according to claim 3 , wherein the tone plan further comprises a plurality of pilot subcarriers and locations of the pilot subcarriers in each RU, wherein the mode of the long training sequence is 2×,, in the first 26-RU, the third and tenth subcarriers are the pilot subcarriers, the G a is a sequence of +1,+1,+1,−1,+1,+1,+1,−1,+1,−1,−1,+1,−1; in the second 26-RU, the fourth and eleventh subcarriers are the pilot subcarriers, the G b is a sequence of +1,+1,+1, −1, −1, , −1, +1, −1, −1, −1, +1, −1.

5. The method according to claim 3 , wherein the tone plan further comprises a plurality of pilot subcarriers and locations of the pilot subcarriers in each RU, wherein the mode of the long training sequence is 4×, in the first 26-RU, the sixth and twentieth subcarriers are the pilot subcarriers, the G a is a sequence of +1, +1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, +1, −1, −1, −1, +1, −1, +1, −1, −1, +1, +1, −1, +1, −1; in the second 26-RU, the seventh and twenty-first subcarriers are the pilot subcarriers, the G b is a sequence of +1, +1, +1, +1, −1, −1, +1, +1, +1, +1, +1, −1, +1, +1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, −1, +1.

6. The method according to the claim 5 , the 4× long training sequence further comprises
a sequence G e , wherein the G e 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.

7. The method according to the claim 1 , wherein:
the tone plan further comprises a plurality of pilot subcarriers and locations of the pilot subcarriers in each RU, and wherein the basic long training sequence further includes at least one or any combination of the following : G a p , −G a p , G c , −G c , G c p , −G c p , G b p , −G b p , G d , −G d , G d p or −G d p ,
a phase of a value the at a pilot subcarrier location of the G a p is reversed with a phase of a value at the pilot subcarrier location of the Ga, and a value the at other locations of the G a p is same with a value at the other subcarrier location of the G a ,
a phase of a value the at a pilot subcarrier location of the G b p is reversed with a phase of a value at the pilot subcarrier location of the G b , wherein a value at other locations of the G b p is same with a value at the other subcarrier location of the G b ,
a phase of a value on an even-numbered subcarrier of the G c is reversed with a phase of a value on an even-numbered subcarrier of the G a , wherein a value the at other subcarrier locations of the G c is same with a value at the other subcarrier locations of the G a ,
a phase of a value on an even-numbered subcarrier of the G d is reversed with a phase of a value on an even-numbered subcarrier of the G b , wherein a value the at other locations of the G d is same with a value at the other locations of the G b ,
a phase of a value at a pilot subcarrier location of the G c p is reversed with a phase of a value at a pilot subcarrier location of the G c , wherein a value the at other locations of the G c p is same with a value at the other locations of the G c , and
a phase of a value at a pilot subcarrier location of the G d p is reversed with a phase of a value at a pilot subcarrier location of the G d , and a value the at other locations of the G d p is same with a value at the other location of the G d .

8. The method according to claim 1 , wherein the bandwidth is 80 MHz, a long training sequence of a 2× mode corresponds to values on subcarriers with the index of −500:2:500 in the following:
+1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, −1, +1, +1, −1, −1, −1, +1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, +1, −1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, +1, −1, −1, +1, −1, −1, −1, +1, +1, +1, +1, −1, +1, −1, −1, −1, +1, −1, −1, −1, −1, +1, +1, +1, +1, −1, −1, −1, +1, +1, +1, 0, 0, 0, +1, −1, −1, +1, +1, −1, +1, −1, −1, −1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, −1, −1, −1, −1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, −1, +1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, −1, +1, +1, −1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, −1, −1, +1, −1, −1, −1, +1, +1, −1, −1, −1, +1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, −1, +1, −1, +1, +1, −1, +1, −1, −1, −1, +1, −1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, −1, −1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, −1, −1, −1, −1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, −1, −1, +1, −1, −1, −1, +1, +1, −1, −1, −1, +1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, −1, +1, +1, −1, −1, +1, −1, −1, −1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, +1.

9. The method according to claim 1 , wherein the bandwidth is 80 MHz, a long training sequence of a 4× mode corresponds to values on subcarriers with

Assignees

• Huawei Tech Co Ltd

Inventors

• Xue Xin
• Wang Ningjuan
• Liu Le
• Lin Wei

Classifications

• H04L27/262

  Reduction thereof by selection of pilot symbols · CPC title

• H04L27/2613 Primary

  Structure of the reference signals · CPC title

• H04L27/26132

  using repetition · CPC title

• H04W72/044 Primary

  based on the type of the allocated resource · CPC title

• H04L27/2614 Primary

  Peak power aspects · CPC title