Method and device for forming control field comprising information about resource units in wireless LAN system
Provided is a control field comprising allocation information about resource units (RUs) in a wireless LAN system in which a plurality of RUs are supported. A control field comprising allocation information about RUs can be comprised in an uplink or downlink PPDU and can be designed in accordance with a plurality of frequency bands. A control field corresponding to a particular frequency band can be duplicated over another frequency band. Also, the control field corresponding to the particular frequency band can be used for scheduling of a data field corresponding to the same frequency band and a data field corresponding to another frequency band.
1. A method of transmitting a physical layer protocol data unit (PPDU) in a wireless local area network (WLAN), the method comprising:
generating the PPDU including a first, a second, a third and a fourth data field used for a first, a second, a third and a fourth frequency band, respectively; and
transmitting the PPDU,
wherein the PPDU includes a first signal field used for the first frequency band and a second signal field used for the second frequency band,
wherein the first signal field includes first identification information on at least one station (STA) allocated to the first data field and the third data field,
wherein the first signal field further includes first allocation information on at least one resource unit (RU) for the first data field and the third data field,
wherein the second signal field includes second identification information on at least one STA allocated to the second data field and the fourth data field,
wherein the second signal field further includes second allocation information on at least one RU for the second data field and the fourth data field,
wherein the PPDU includes a third signal field used for the third frequency band, and the first identification information and the first allocation information are included in the third signal field, and
wherein the PPDU includes a fourth signal field used for the fourth frequency band, and the second identification information and the second allocation information are included in the fourth signal field.
2. The method of claim 1 , wherein the first identification information includes an association identifier (AID) of the at least one STA allocated to the first data field and the third data field.
3. The method of claim 1 , wherein the first signal field includes a look-up table used for the at least one RU for the first data field and the third data field.
4. The method of claim 1 ,
wherein the first signal field includes a user common field and a user specific field,
wherein the first identification information is included in the user common field, and
wherein the first allocation information is included in the user specific field.
5. The method of claim 1 ,
wherein each of the first to fourth frequency bands includes a 20 MHz band.
6. An apparatus in a wireless local area network (WLAN) system, the apparatus comprising:
a radio frequency (RF) unit for transmitting a physical layer protocol data unit (PPDU); and
a processor operatively coupled to the RF unit,
wherein the processor is configured for:
generating the PPDU including a first, a second, a third and a fourth data field used for a first, a second, a third and a fourth frequency band, respectively; and
transmitting the PPDU,
wherein the PPDU includes a first signal field used for the first frequency band and a second signal field used for the second frequency band,
wherein the first signal field includes first identification information on at least one station (STA) allocated to the first data field and the third data field,
wherein the first signal field further includes first allocation information on at least one resource unit (RU) for the first data field and the third data field,
wherein the second signal field includes second identification information on at least one STA allocated to the second data field and the fourth data field,
wherein the second signal further includes second allocation information on at least one RU for the second data field and the fourth data field,
wherein the PPDU includes a third signal field used for the third frequency band, and the first identification information and the first allocation information are included in the third signal field, and
wherein the PPDU includes a fourth signal field used for the fourth frequency band, and the second identification information and the second allocation information are included in the fourth signal field.
7. The apparatus of claim 6 , wherein the first identification information includes an association identifier (AID) of the at least one STA allocated to the first data field and the third data field.
8. The apparatus of claim 6 , wherein the first signal field includes a look-up table used for the at least one RU for the first data field and the third data field.
9. The apparatus of claim 6 ,
wherein the first signal field includes a user common field and a user specific field,
wherein the first identification information is included in the user common field, and
wherein the first allocation information is included in the user specific field.
10. The apparatus of claim 6 ,
wherein each of the first to fourth frequency bands includes a 20 MHz band.
11. An apparatus in a wireless local area network (WLAN) system, the apparatus comprising:
a radio frequency (RF) unit for receiving a radio signal; and
a processor operatively coupled to the RF unit,
wherein the processor is configured to:
instruct the RF unit to receive a physical layer protocol data unit (PPDU) including a first, a second, a third and a fourth data field used for a first, a second, a third and a fourth frequency band, respectively; and
decode the PPDU,
wherein the PPDU includes a first signal field used for the first frequency band and a second signal field used for the second frequency band,
wherein the first signal field includes first identification information on at least one station (STA) allocated to the first data field and the third data field,
wherein the first signal field further includes first allocation information on at least one resource unit (RU) for the first data field and the third data field,
wherein the second signal field includes second identification information on at least one STA allocated to the second data field and the fourth data field,
wherein the second signal further includes second allocation information on at least one RU for the second data field and the fourth data field,
wherein the PPDU includes a third signal field used for the third frequency band, and the first identification information and the first allocation information are included in the third signal field, and
wherein the PPDU includes a fourth signal field used for the fourth frequency band, and the second identification information and the second allocation information are included in the fourth signal field.
12. The apparatus of claim 11 , wherein the first identification information includes an association identifier (AID) of the at least one STA allocated to the first data field and the third data field.
13. The apparatus of claim 11 , wherein the first signal field includes a look-up table used for the at least one RU for the first data field and the third data field.
14. The apparatus of claim 11 , wherein the first signal field includes a user common field and a user specific field,
wherein the first identification information is included in the user common field, and
wherein the first allocation information is included in the user specific field.
15. The apparatus of claim 11 , wherein each of the first to fourth frequency bands includes a 20 MHz band.