Method for transmitting frame in wireless LAN system
The present invention relates to a method for transmitting a frame in a wireless communication system, in particular, a high density wireless LAN system, and a station apparatus for performing the same. To this end, a station for transmitting a frame configures a radio frame for a second type station, including a frame part for a first type station and a frame part for the second type station, wherein the frame part for the second type station includes a first signaling field (SIG A) for the second type station and a second signaling field (SIG B) for the second type station. The SIG A for the second type station includes modulation and coding scheme (MCS) information applied to the SIG B for the second type station, and the MCS level applied to the SIG B for the second type station supports an MCS having level than the lowest MCS level defined for the first type station.
1. A method for transmitting a radio frame by a second type station (STA) in a wireless local area network (WLAN) system, the method comprising:
configuring the radio frame including a first part for a first type STA and a second part for the second type STA,
wherein the second part comprises a first signaling field; and
and a second signaling field
transmitting the configured radio frame via a bandwidth equal to or greater than 80 MHz,
wherein configuring the radio frame comprises:
processing information for at least one of the first signaling field or the second signaling field for a first 20 MHz of the bandwidth; and
duplicating the information processed for the first 20 MHz into a second 20 MHz within the bandwidth,
wherein processing the information comprises:
encoding and modulating the information according to a lowest MCS (Modulation and Coding Scheme) level among available MCS levels,
wherein the lowest MCS is used for BPSK (Binary Phase Shift Keying) with a ½ coding rate; and
repeating the information in a unit of N bits,
wherein N is integer greater than 1.
2. The method of claim 1 ,
wherein the first signaling field provides common control information and
wherein the second signaling field provides user-specific control information required for data transmission.
3. The method of claim 1 ,
wherein the second type STA is a terminal that supports communication schemes in accordance with IEEE 802.11ax standards and
wherein the first type STA is a legacy terminal in view of the second type STA.
4. The method of claim 1 , wherein the processing information comprises:
encoding the information at the ½ coding rate;
interleaving the encoded information;
modulating and repeating the interleaved information by BPSK and by 2 or more times; and
transforming the repeated information into a transmission signal for at least one of the first signaling field or the second signaling field of the radio frame.
5. The method of claim 1 , wherein an available MCS level higher than the lowest MCS comprises one of: BPSK with a ¼ coding rate, QPSK with a ¼ coding rate, or QPSK with a ¼ coding rate.
6. A device operating as a second type station (STA) in a wireless local area network (WLAN) system, the device comprising:
a processor configured to configure a radio frame including a first part for a first type STA and a second part for the second type STA,
wherein the second part comprises a first signaling field and a second signaling field; and
a transmitter configured to transmit the radio frame via a bandwidth equal to or greater than 80 MHz,
wherein the processor configures the radio frame by:
processing information for at least one of the first signaling field or the second signaling field for a first 20 MHz of the bandwidth: and
duplicating the information processed for the first 20 MHz into a second 20 MHz within the bandwidth,
wherein the processor processes the information by:
encoding and modulating the information according to a lowest MCS (Modulation and Coding Scheme) level among available MCS levels,
wherein the lowest MCS is used for BPSK (Binary Phase Shift Keying) with a ½ coding rate; and
repeating the information in a unit of N bits,
wherein N is integer greater than 1.
7. The device of claim 6 ,
wherein the processor configures the first signaling field to provide common control information, and
wherein the processor configures the second signaling field to provide user-specific control information required for data transmission.
8. The device of claim 6 ,
wherein the second type STA is a terminal that supports communication schemes in accordance with IEEE 802.11ax standards, and
wherein the first type STA is a legacy terminal in view of the second type STA.
9. The device of claim 6 , wherein the processor comprises:
an encoder for encoding the information at the ½ coding rate;
an interleaver for interleaving the encoded information;
a modulation mapper for modulating and repeating the interleaved information by BPSK and by 2 or more times; and
a transformer for transforming the repeated information into a transmission signal for at least one of the first signaling field or the second signaling field of the radio frame.
10. The device of claim 6 , wherein an available MCS level higher than the lowest MCS comprises one of: BPSK with a ¼ coding rate, QPSK with a ¼ coding rate, or QPSK with a ¼ coding rate.