Method and apparatus for receiving data unit

Patent metadata

Field	Value
Publication number	US-2016353370-A1
Application number	US-201415116491-A
Country	US
Kind code	A1
Filing date	Dec 11, 2014
Priority date	Feb 4, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

Disclosed are a method and an apparatus for receiving a data unit. A method for receiving a data unit in a wireless local area network can comprise the steps of: an STA transmitting an association request frame to an AP, the association request frame containing PPDU format request information; and the STA receiving, from the AP, an association response frame as a response for the association request frame, the association response frame containing PPDU format determination information, wherein the PPDU format request information can comprise PPDU format information for the AP to communicate with the STA, and the PPDU format determination information can comprise information for whether the communication will be carried out on the basis of a PPDU format.

First claim

What is claimed is:

1 . A method for receiving data units in a wireless LAN, the method comprising:
transmitting an association request frame by a STA (station) to an AP (access point), wherein the association request frame includes PPDU (physical layer protocol data unit) format request information; and receiving an association response frame by the STA from the AP as a response to the association request frame, wherein the association response frame includes PPDU format decision information, wherein the PPDU format request information includes information on a PPDU format allowing the STA to establish communication with the AP, and wherein the PPDU format decision information includes information on whether or not to perform the communication based on the PPDU format.

2 . The method of claim 1 , wherein the PPDU format defines a HE (high efficiency)-SIG (signal) A field and a HE-STF (short training field) being temporally contiguous to the HE-SIG A field,
wherein the HE-SIG A field includes an identifier of a BSS (basic service set) having transmitted the PPDU including the HE-SIG A field, and information on a transmission bandwidth of a field after the HE-SIG A field, and wherein the HE-STF is used for automatic gain control estimation for decoding the PPDU.

3 . The method of claim 2 , wherein a first is used for transmitting the HE-SIG A field, wherein a second IFFT is used for transmitting the HE-STF, and wherein a size of the second IFFT is 4 times larger than a size of the first IFFT.

4 . The method of claim 3 , wherein the HE-SIG A field is transmitted over two first OFDM (orthogonal frequency division multiplexing) symbols,
wherein the HE-STF is transmitted over one second OFDM symbol, wherein a duration of the first OFDM symbol includes a first GI (guard interval) duration of 0.8 us and a first valid symbol duration of 3.2 us, wherein a duration of the second OFDM symbol includes a second GI duration of 3.2 us and a second valid symbol duration of 12.8 us or a third GI duration of 0.8 us and a second valid symbol duration of 12.8 us.

5 . The method of claim 3 , wherein the HE-SIG A field is transmitted over multiple OFDM (orthogonal frequency division multiplexing) symbols, and
wherein at least one OFDM symbol of the multiple OFDM symbols includes one of a long GI (guard interval), a double GI, and a triple GI.

6 . The method of claim 2 , wherein the PPDU further includes a HE-SIG B field,
wherein the HE-SIG B field includes resource allocation information, and wherein the resource allocation information includes information on radio resource being allocated to each multiple STAs receiving the PPDU based on OFDMA (orthogonal frequency division multiple access).

7 . A STA (station) receiving data units in a wireless LAN, the STA comprising:
a RF (radio frequency) unit configured to transmit and receive radio signals; and a processor being optionally connected to the RF unit, wherein the processor is configured to transmit an association request frame to an AP (access point), wherein the association request frame includes PPDU (physical layer protocol data unit) format request information, and to receive an association response frame from the AP as a response to the association request frame, wherein the association response frame includes PPDU format decision information, wherein the PPDU format request information includes information on a PPDU format allowing the STA to establish communication with the AP, and wherein the PPDU format decision information includes information on whether or not to perform the communication based on the PPDU format.

8 . The STA of claim 7 , wherein the PPDU format defines a HE (high efficiency)-SIG (signal) A field and a HE-STF (short training field) being temporally contiguous to the HE-SIG A field,
wherein the HE-SIG A field includes an identifier of a BSS (basic service set) having transmitted the PPDU including the HE-SIG A field, and information on a transmission bandwidth of a field after the HE-SIG A field, and wherein the HE-STF is used for automatic gain control estimation for decoding the PPDU.

9 . The STA of claim 8 , wherein a first IFFT is used for transmitting the HE-SIG A field, wherein a second IFFT is used for transmitting the HE-STF, and wherein a size of the second IFFT is 4 times larger than a size of the first IFFT.

10 . The STA of claim 9 , wherein the HE-SIG A field is transmitted over two first OFDM symbols,
wherein the HE-STF is transmitted over one second OFDM symbol, wherein a duration of the first OFDM symbol includes a first GI (guard interval) duration of 0.8 us and a first valid symbol duration of 3.2 us, wherein a duration of the second OFDM symbol includes a second GI duration of 3.2 us and a second valid symbol duration of 12.8 us or a third GI duration of 0.8 us and a second valid symbol duration of 12.8 us.

11 . The STA of claim 9 , wherein the HE-SIG A field is transmitted over multiple OFDM (orthogonal frequency division multiplexing) symbols, and
wherein at least one OFDM symbol of the multiple OFDM symbols includes one of a long GI (guard interval), a double GI, and a triple GI.

12 . The STA of claim 8 , wherein the PPDU further includes a HE-SIG B field,
wherein the HE-SIG B field includes resource allocation information, and wherein the resource allocation information includes information on radio resource being allocated to each multiple STAs receiving the PPDU based on OFDMA (orthogonal frequency division multiple access).

Assignees

• Lg Electronics Inc

Inventors

• Choi Jinsoo
• Lee Wookbong
• Cho Hangyu
• Chun Jinyoung
• Lim Dongguk

Classifications

• H04W48/20 Primary

  Selecting an access point · CPC title

• H04L27/2646

  using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length · CPC title

• H04L1/0083

  Formatting with frames or packets; Protocol or part of protocol for error control · CPC title

• H04L69/322

  Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title