Wireless communication method and apparatus for wireless local area network system
A wireless communication method and apparatus in a wireless local area network (WLAN) system are disclosed. A wireless communication method according to one embodiment may include generating a high-efficiency Wi-Fi (HEW) frame including at least one of an HEW-SIG-A field and an HEW-SIG-B field which include channel information for communications according to an Orthogonal Frequency-Division Multiple Access (OFDMA) mode, and transmitting the generated HEW frame to a reception apparatus.
1. A wireless communication method performed by a wireless communication apparatus in a wireless local area network (WLAN) system, the wireless communication method comprising:
generating a high-efficiency Wi-Fi (HEW) frame comprising an HEW-SIG-A field and an HEW-SIG-B field, wherein the HEW-SIG-B field comprises bit information that comprises subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to multiple users is allowed; and
transmitting the generated HEW frame to the multiple users,
wherein the subchannel allocation information indicates a position of each of subchannels in a channel bandwidth of 20 MHz, 40 MHz, 80 MHz, 80 MHz+80 MHz, or 160 MHz,
wherein a frequency bandwidth of each of the subchannels is greater than 0 and smaller than 20 MHz,
wherein each of the subchannels represents a minimum allocation unit, and
wherein the frequency bandwidth of each of the subchannels is dynamically set from 0 to 20 MHz.
2. The wireless communication method of claim 1 , wherein the HEW-SIG-A field comprises at least one of bit information indicating an OFDMA mode, bit information indicating a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode, and bit information indicating a coding mode of channels transmitted in the OFDMA mode.
3. The wireless communication method of claim 1 , wherein the HEW-SIG-A field comprises at least one of bit information indicating an OFDMA mode, bit information indicating a multi-user multiple-input multiple-output (MU-MIMO) mode, and bit information indicating a channel to be demodulated by each of the multiple users.
4. The wireless communication method of claim 1 , wherein the HEW-SIG-B field further comprises at least one of bit information indicating a bandwidth used by each channel in the OFDMA mode, bit information indicating a modulation and coding mode used by each channel in the OFDMA mode, bit information indicating a partial allocation identifier (AID) used by each channel in the OFDMA mode, and bit information indicating a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode.
5. The wireless communication method of claim 1 , wherein the subchannel allocation information in the OFDMA mode comprises allocation information on subchannels not adjacent.
6. The wireless communication method of claim 1 , wherein the bit information indicating the subchannel allocation information in the OFDMA mode indicates channel allocation information in bit information in a 20-MHz frequency bandwidth unit.
7. The wireless communication method of claim 1 , wherein the transmitting of the HEW frame transmits the HEW-SIG-B field using a frequency bandwidth indicated in the HEW-SIG-A field.
8. A wireless communication method performed by a wireless communication apparatus in a wireless local area network (WLAN) system, the wireless communication method comprising:
receiving, by the wireless communication apparatus corresponding to one of multiple users from a transmission apparatus, a high-efficiency Wi-Fi (HEW) frame comprising an HEW-SIG-A field and an HEW-SIG-B field, wherein the HEW-SIG-B field comprises bit information that comprises subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to the multiple users is allowed; and
determining each of subchannels to be used for communications based on at least the subchannel allocation information,
wherein the subchannel allocation information indicates a position of each of subchannels in a channel bandwidth of 20 MHz, 40 MHz, 80 MHz, 80 MHz+80 MHz, or 160 MHz,
wherein a frequency bandwidth of each of the subchannels is greater than 0 and smaller than 20 MHz,
wherein each of the subchannels represents a minimum allocation unit, and
wherein the frequency bandwidth of each of the subchannels is dynamically set from 0 to 20 MHz.
9. The wireless communication method of claim 8 , wherein the wireless communication apparatus determines, based on channel information comprised in the HEW-SIG-A field, a channel through which the HEW-SIG-B field is transmitted.
10. The wireless communication method of claim 8 , wherein the wireless communication apparatus demodulates the HEW-SIG-B field based on an HEW-LTF comprised in the HEW-SIG-A field.
11. The wireless communication method of claim 8 , wherein the HEW-SIG-A field comprises at least one of bit information indicating an OFDMA mode, bit information indicating a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode, and bit information indicating a coding mode of channels transmitted in the OFDMA mode.
12. The wireless communication method of claim 8 , wherein the HEW-SIG-A field comprises at least one of bit information indicating an OFDMA mode, bit information indicating a multi-user multiple-input multiple-output (MU-MIMO) mode, and bit information indicating a channel to be demodulated by each of the multiple users.
13. The wireless communication method of claim 8 , wherein the HEW-SIG-B field further comprises at least one of bit information indicating a bandwidth used by each channel in the OFDMA mode, bit information indicating a modulation and coding mode used by each channel in the OFDMA mode, bit information indicating a partial allocation identifier (AID) used by each channel in the OFDMA mode, and bit information indicating a number of space-time streams (NSTS) of channels transmitted in the OFDMA mode.
14. A wireless communication apparatus comprising:
a processor to generate a high-efficiency Wi-Fi (HEW) frame comprising an HEW-SIG-A field and an HEW-SIG-B field, wherein the HEW-SIG-B field comprises bit information comprising subchannel allocation information in an Orthogonal Frequency-Division Multiple Access (OFDMA) mode where different subchannels are allocated to different users and simultaneous data transmission to multiple users is allowed; and
a transmitter to transmit the generated HEW frame to the multiple users,
wherein the subchannel allocation information indicates a position of each of the subchannels in a channel bandwidth of 20 MHz, 40 MHz, 80 MHz, 80 MHz+80 MHz, or 160 MHz,
wherein a frequency bandwidth of each of the subchannels is greater than 0 and smaller than 20 MHz,
wherein each of the subchannels represents a minimum allocation unit, and
wherein the frequency bandwidth of each of the subchannels is dynamically set from 0 to 20 MHz.