METHOD AND DEVICE FOR TRANSFERRING DATA FROM WIRELESS LAN TO PLURALITY OF STAS

• US 20160301451A1
• Filed: 06/19/2014
• Published: 10/13/2016
• Est. Priority Date: 12/14/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seok, Yongho
• Granted Patent: US 10,211,890 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Disclosed are a method and a device for transferring data from a wireless LAN to a plurality of stations (STAs). The method for transferring data from a wireless LAN to a plurality of STAs may comprise: a step in which an AP generates a MIMOOFDMA format PPDU; and a step in the AP transfers the MIMO-OFDMA format PPDU to the plurality of STAs, wherein the MIMO-OFDMA format PPDU comprises a plurality of sub-channel format PPDUs which are synchronized in time phase, and the plurality of sub-channel format PPDUs are transferred respectively to the plurality of STAs through a plurality of respective sub-channel bands, and the number of training fields for the MIMO transfer which are included in the respective plurality of subchannel format PPDUs can be the same.

Claims

1. A method of transmitting data to a plurality of stations (STAs) in a wireless local area network (LAN), the method comprising:

generating, by an access point (AP), a multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) format physical layer convergence procedure (PLCP) protocol data unit (PPDU) comprising a plurality of sub-channel format PPDUs, wherein the plurality of sub-channel format PPDUs are transmitted through a plurality of sub-channel bands, wherein each of the plurality of sub-channel format PPDUs comprises a signal field and at least one training field for MIMO transmission, wherein the number of the at least one training field is determined based on a maximum value of the number of spatial streams for the sub-channel format PPDUs, wherein the signal field indicates the number of the at least one training field; and

transmitting, by the AP, the MIMO-OFDMA format PPDU to the plurality of STAs,

wherein the number of training fields for MIMO transmission and included respectively in the plurality of sub-channel format PPDUs is identical.

2. The method of claim 1, wherein the number of the at least one training field is determined to be one of 1, 2, 4, 6, 8.

4. The method of claim 1,

wherein the signal field further indicates group identifier information, bandwidth information, and Nsts information,

wherein the group identifier information comprises identifier information for indicating the plurality of STAs,

wherein the bandwidth information comprises information regarding a channel bandwidth allocated to each of the plurality of sub-channel format PPDUs, and

wherein the Nsts information comprises information regarding the number of spatial streams for each of the plurality of sub-channel format PPDU.

5. The method of claim 1,

wherein each of the plurality of sub-channel format PPDU comprises a PLCP service data unit (PSDU),

wherein a guard interval used for transmission of the PSDU is one of a long guard interval (LGI), a short guard interval (SGI), and a GI combination, and

wherein the GI combination is a combination of a double guard interval (DGI) and one GI between the LGI and the SGI.

6. The method of claim 5,

wherein the GI is used in at least one OFDM symbol among a plurality of OFDM symbols corresponding to a point coordination function (PCF) inter frame symbol (PIFS) interval in entire OFDM symbols for transmission of the PSDU, and

wherein the DGI is used in the remaining OFDM symbols other than the at least one OFDM symbol among the entire symbols.

3. (canceled)

7. An access point (AP) for transmitting data to a plurality of stations (STAs) in a wireless local area network (LAN), the AP comprising:

a radio frequency (RF) unit configured to transmit or receive a radio signal; and

a processor selectively coupled to the RF unit,

wherein the processor is configured to;

generate a multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) format physical layer convergence procedure (PLCP) protocol data unit (PPDU) comprising a plurality of sub-channel format PPDUs, wherein the plurality of sub-channel format PPDUs are transmitted through a plurality of sub-channel bands, wherein each of the plurality of sub-channel format PPDUs comprises a signal field and at least one training field for MIMO transmission, wherein the number of the at least one training field is determined based on a maximum value of the number of spatial streams for the sub-channel format PPDUs, wherein the signal field indicates the number of the at least one training field; and

wherein the number of training fields for MIMO transmission and included respectively in the plurality of sub-channel format PPDUs is identical.

8. The AP of claim 7, wherein the number of the at least one training field is determined to be one of 1, 2, 4, 6, 8.

10. The AP of claim 7,

wherein the signal field further indicates group identifier information, bandwidth information, and Nsts information,

wherein the group identifier information comprises identifier information for indicating the plurality of STAs,

wherein the bandwidth information comprises information regarding a channel bandwidth allocated to each of the plurality of sub-channel format PPDUs, and

wherein the Nsts information comprises information regarding the number of spatial streams for each of the plurality of sub-channel format PPDU.

11. The AP of claim 7,

wherein each of the plurality of sub-channel format PPDU comprises a PLCP service data unit (PSDU),

wherein a guard interval used for transmission of the PSDU is one of a long guard interval (LGI), a short guard interval (SGI), and a GI combination, and

wherein the GI combination is a combination of a double guard interval (DGI) and one GI between the LGI and the SGI.

12. The AP of claim 11,

wherein the GI is used in at least one OFDM symbol among a plurality of OFDM symbols corresponding to a point coordination function (PCF) inter frame symbol (PIFS) interval in entire OFDM symbols for transmission of the PSDU, and

wherein the DGI is used in the remaining OFDM symbols other than the at least one OFDM symbol among the entire symbols.

9. (canceled)