Method for transmitting HE-LTF sequence and apparatus

• US 10,645,687 B2
• Filed: 02/26/2018
• Issued: 05/05/2020
• Est. Priority Date: 08/26/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Xue, Xin, Wang, Ningjuan, Liu, Le, Lin, Wei
• Primary Examiner(s): Lee, Chi Ho A
• Application Number:
  US15/905,567
• Publication Number:
  US 20180184408A1
• Time in Patent Office: 799 Days
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 27/262 Reduction thereof by selection of pilot symbols
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

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.

Claims

1. A method for sending a long training sequence in a wireless local area network, the method comprising:

obtaining, by an apparatus, according to a transmission bandwidth, an HE-LTF sequence corresponding to the transmission bandwidth; and

according to a size and a location of a resource block (RU) allocated to a station, mapping a sequence segment in the HE-LTF sequence to subcarriers in the allocated RU wherein the sequence segement'"'"'s location correpsonds to the location of the allocated RU, and

sending the sequence segment;

wherein a 4×

HE-LTF sequence in an 80 MHz bandwidth transmission is HE-LTF_4x (−

500;

500), the HE-LTF_4x (−

500;

400)comprises values on subcarriers with indexes −

500;

500,

2. The method according to claim 1, wherein:

the HE-LTF sequence is a stored sequence or a generated sequence;

the generated HE-LTF sequence is constructed by

9. 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.

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

3. A method for receiving a data packet in a wireless local area network, comprising:

receiving a data packet, by an apparatus;

obtaining, by the apparatus, according to a transmission bandwidth of the data packet, an HE-LTF sequence corresponding to the transmission bandwidth; and

determining, by the apparatus, according to a size and a location of a resource block (RU) allocated to a station in the data packet, a corresponding HE-LTF sequence segment as a reference sequence that corresponds to the RU for channel estimation;

wherein a 4×

HE-LTF sequence in an 80 MHz bandwidth transmission is HE-LTF_4x (−

500;

500) comprises values on subcarriers with indexes −

500;

500,

4. The method according to claim 3, wherein:

the HE-LTF sequence is a stored sequence or a generated sequence;

the generated HE-LTF sequence is constructed by

11. The method according to claim 3, the method further comprising:

sending by the apparatus, 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.

12. The method according to claim 3, wherein the apparatus is an access point (AP), a station, or a chip.

5. An apparatus applied in a wireless local area network, comprising a processor and a memory, wherein the memory stores instructions for the processor to:

obtain, according to a transmission bandwidth, an HE-LTF sequence corresponding to the transmission bandwidth;

according to a size and a location of a resource block RU allocated to a station, map a sequence segment in the HE-LTF sequence to subcarriers in the allocated RU, wherein the sequence segment'"'"'s location corresponds to the location of the allocated and

send the sequence segment;

wherein a 4×

HE-LTF sequence in an 80 MHz bandwidth transmission is HE-LTF_4x (−

500;

500), the HE-LTF_4x (−

500;

500) comprises values on subcarriers with indexes −

500;

500,

6. The apparatus according to claim 5, wherein:

the HE-LTF sequence is a stored sequence or a generated sequence;

the generated HE-LTF sequence is constructed by

13. The apparatus according to claim 5, wherein the memory further stores instructions for the processor to:

receive 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.

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

7. An apparatus applied in a wireless local area network, comprising a processor and a memory, wherein the memory stores instructions for the processor to:

receive a data packet;

obtain, according to a transmission bandwidth of the data packet, an HE-LTF sequence corresponding to the transmission bandwidth; and

determine, according to a size and a location of a resource block (RU) allocated to the station in the data packet, a corresponding HE-LTF sequence segment, as a reference sequence that corresponds to the RU for channel estimation;

wherein a 4×

HE-LTF sequence in an 80 MHz bandwidth transmission is HE-LTF_4x (−

500;

500), the HE-LTF_4x (−

500;

500) comprises values on subcarriers with indexes −

500;

500,

8. The apparatus according to claim 7, wherein:

the HE-LTF sequence is a stored sequence or a generated sequence;

the generated HE-LTF sequence is constructed by

15. The apparatus according to claim 7, wherein the memory further stores instructions for the processor to:

send 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.

16. The apparatus according to claim 7, wherein the receiving end is an access point (AP), a station, or a chip.