Method for transmitting HE-LTF sequence and apparatus

Patent metadata

Field	Value
Publication number	US-10616882-B2
Application number	US-201916355385-A
Country	US
Kind code	B2
Filing date	Mar 15, 2019
Priority date	Aug 26, 2015
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

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

First claim

What is claimed is:

1. A method performed by an apparatus, for sending a long training sequence in a wireless local area network, the method comprising:
obtaining a high efficiency long training field (HE-LTF) sequence corresponding to a transmission bandwidth, according to the transmission bandwidth;
mapping a sequence segment in the HE-LTF sequence to subcarriers in a resource unit (RU) allocated to a station, according to a size and a location of the RU allocated to the station, wherein the sequence segment corresponds to the location of the RU; and
sending the sequence segment;
wherein a 2× HE-LTF sequence in an 80 MHz bandwidth transmission is HE-LTF 2x (−500:2:500), wherein the HE-LTF 2x (−500:2:500) includes values on subcarriers with indexes −500:2:500, and
the HE-LTF 2x (−500:2:500)=[+1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, −1, +1, +1, −1, −1, −1, +1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, +1, −1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, +1, −1, −1, +1, −1, −1, −1, +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].

2. The method according to claim 1 , wherein:
the HE-LTF sequence is a stored sequence.

3. The method according to claim 1 , wherein the 2× HE-LTF sequence in an 80 MHz bandwidth transmission is constructed by:
HELTF 2x (−500:2:500)={+1, +G c , +G c p , +1+G a , −G a p , +G d , −1, +G c p , +G c , +1, +G a p , −G a , +1, −G a , +G a p , −1, +G c , +G c p , +G b , +1, +G a p , −G a , +1, −G c p , −G c , +1, −1, −1, −1, +1, +1, +1, 0, 0, 0, +1, −1, +1, +1, −1, +1, −G b , −G b p , −1, −G d , +G d p , −1, +G c , +G b p , +G b , +1, +G d p , −G d , −1, +G d , −G d p , +1, −G b , −G b p , −1, −G a , +G d p , −G d , +1, −G b p , −G b , +1},
{+1,+G c ,+G c p ,+ 1 ,+G a ,−G a p ,+G d ,−1+G c p ,+G c+ 1,+G a p , −G a , +1,−G a ,+G a p ,−1,+G c , +G c p , +G b ,+1, +G a p ,−G a ,+1,−G c p , −G c , +1,−1,−1,−1,+1,+1,+1,0,0,0,+1,−1,−1,+1,+1,−1,+1, −G b , −G b p ,−G d ,+G d p ,−1, +G c ,+G b p ,+G b , 30 1,+G d p , −G d , −1, −G b , −G b p ,−1, −G d ,+G d p , +G c ,+G b p ,+G b ,+1,+G d p ,−G d ,−1, +G d , −G d p ,+1, −G b , −G b p , −1, −G a , +G d p ,−G d , +1, −G b p , −G b , +1},
wherein G a ={+1, +1, +1, −1, +1, +1, +1, −1, +1, −1, −1, +1, −1},

G b ={+1, +1, +1, −1, −1, −1, −, +1, −1, −1, −1, +1, −1},
G a p is a sequence that is obtained after a phase of a value at a pilot location of the Ga sequence is reversed,
G b p is a sequence that is obtained after a phase of a value at a pilot location of the Gb sequence is reversed,
G c is a sequence that is obtained after a phase of a value on an even-numbered subcarrier of the Ga sequence is reversed,
G d is a sequence that is obtained after a phase of a value on an even-numbered subcarrier of the Gb sequence is reversed,
G c p is a sequence that is obtained after a phase of a value at a pilot location of a G c sequence is reversed, and
G d p is a sequence that is obtained after a phase of a value at a pilot location of a G d sequence is reversed.

4. The method according to claim 1 , the method further comprising:
receiving a triggering frame, the triggering frame including the transmission bandwidth, an ID of the station, and the size and the location of the RU allocated to the station.

5. The method according to claim 1 , wherein the apparatus is an access point (AP), a station, or a chip.

6. A method performed by an apparatus, for receiving a data packet in a wireless local area network, comprising:
receiving a data packet;
obtaining a high efficiency long training field (HE-LTF) sequence corresponding to a transmission bandwidth, according to the transmission bandwidth; and
determining a corresponding HE-LTF sequence segment as a reference sequence that corresponds to a resource unit (RU) allocated to a station for channel estimation, according to a size and a location of the RU allocated to the station in the data packet;
wherein a 2× HE-LTF sequence in an 80 MHz bandwidth transmission is HE-LTF 2x (−500:2:500), the HE-LTF 2x (−500:2:500) includes values on subcarriers with indexes −500:2:500, and
HE-LTF 2x (−500:2:500)=[+1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, +1, −1, +1, +1, +1, −1, +1, −1, −1, +1, −1, −1, −1, +1, +1, −1, −1, −1, +1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, +1, −1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, +1, −1, +1, +1, +1, −1, +1, +1, +1, +1, −1, −1, −1, +1, −1, −1, +1, +1, −1, +1, +1, +1, −1, −1, −1, −1, +1, +1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, +1, −1, −1, +1, +1, +1, −1, +1, +1, −1, +1, −1, −1, −1, −1, +1, −1, −1, −1, +1, −1, +1, +1, −1, +1, +1, −1, +1, +1, −1, −1, +1, −1, −1, −1, +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,

Assignees

• Huawei Tech Co Ltd

Inventors

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

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04L27/2614 Primary

  Peak power aspects · CPC title

• H04W28/18

  Negotiating wireless communication parameters · CPC title

• H04L27/2613 Primary

  Structure of the reference signals · CPC title