US 10,320,537 B2Granted

Downlink physical layer protocol data unit format in a high efficiency wireless LAN

AssigneeNewracom, Inc.

InventorYongho Seok

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present invention provides a new downlink frame format to support MU-MIMO and OFDMA, and methods, apparatuses, etc. therefor. In an aspect of the present invention, a method for transmitting data to a plurality of STAs by an AP in a WLAN may include generating a HE-LTF field for the plurality of STAs, and transmitting a PPDU frame to the plurality of STAs, the PPDU frame including the HE-LTF field and data for the plurality of STAs. The data for the plurality of STAs may be transmitted to different STA on each of a plurality of subchannels, and a starting point of the HE-LTF field may be same across the plurality of STAs and an end point of the HE-LTF field may be same across the plurality of STAs.

Claims19

Dependent claims

A method for transmitting data to a plurality of Stations (STAs) by an Access Point (AP) in a Wireless Local Area Network (WLAN), the method comprising:

allocating one or more of the STAs of the plurality of STAs to each of a plurality of sub channels;
generating a High Efficiency-Long Training Field (HE-LTF) for the plurality of STAs by:
determining, for each subchannel of the plurality of subchannels respectively, a sum of a number of spatial streams allocated to all STAs of the subchannel,
determining a maximum of the respective sums of the subchannels of the plurality of subchannels, and
including a plurality of HE-LTF symbols in the HE-LTF, a number of the plurality of HE-LTF symbols being equal to or greater than the maximum of the respective sums;
and
transmitting a Physical layer Protocol Data Unit (PPDU) frame to the plurality of STAs, the PPDU frame including the HE-LTF and data for the plurality of STAs,
wherein the data for the plurality of STAs are transmitted to different STA on each of a plurality of subchannels, and
wherein a starting point of the HE-LTF is same across the plurality of STAs and an end point of the HE-LTF is same across the plurality of STAs.

6 more elements

A method for receiving data from an Access Point (AP) by a Station (STA) of a plurality of STAs in a Wireless Local Area Network (WLAN), the method comprising:

receiving a first High Efficiency-Long Training Field (HE-LTF) section in a first subchannel of a plurality of subchannels of a Physical layer Protocol Data Unit (PPDU) frame;
performing channel estimation for the first subchannel using the first HE-LTF section;
and
receiving, from the first subchannel using the results of the channel estimation, data for the STA from among data for the plurality of STAs in the PPDU frame,
wherein the data for the plurality of STAs are respectively transmitted to different STA on each of the plurality of subchannels,
wherein each of the plurality of subchannels includes a respective HE-LTF section;
wherein a starting point of the HE-LTF sections of the plurality of subchannels is same across the plurality of subchannels and an end point of the HE-LTF sections is same across the plurality of subchannels,
wherein each of the HE-LTF sections includes a plurality of respective HE-LTF elements, and
wherein the number of the plurality of HE-LTF elements is equal to or greater than the number of spatial streams transmitted in a subchannel having a maximum value among total numbers respectively corresponding to the plurality of subchannels, and each total number is a sum of the numbers of spatial streams allocated to all STAs in the corresponding subchannel.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/811,663Filed 13 Nov 2017 · continuation
Priority: KR 10-2014-00838894 Jul 2014
Published: US 2018/0109362 A119 Apr 2018
Granted: 11 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H04L 27/2603
Signal structure: signal structure ensuring backward compatibility with legacy system
H04B 7/0452
MIMO systems: multi-user MIMO systems
H04L 5/0007
Time-frequency: the frequencies being orthogonal, e.g. OFDM or DMT
H04L 5/003
Arrangements affording multiple use of the transmission path: arrangements for allocating sub-channels of the transmission path

Family

Application14/790,878Parent of this continuation · filed 2 Jul 2015
US 2018/0109362 A1Pre-grant publication · published 19 Apr 2018
US 9,819,460 B2Parent of this continuation
US 2016/0007325 A1Published application
US 10,320,537 B2This patent

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

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key