Method for configuring frame including signal field including control information for data field in wireless local area network system and apparatus therefor
It is proposed an example for mapping between a signal field and a data field used in a wireless local area network (LAN) system supporting a plurality of resource units (RUs). If a second channel (e.g., a 20 MHz band) is nullified and thus a physical layer protocol data unit (PPDU) is not transmitted, a signal field transmitted through a first channel may include allocation information regarding all data channels, and a signal field transmitted through the first channel is preferably duplicated on a third channel. In this case, a signal field transmitted through a fourth channel may include only allocation information for a data field corresponding to the fourth channel.
1. A method for transmitting a physical layer protocol data unit (PPDU) in a wireless local area network (WLAN) system, the method comprising:
configuring, by an access point (AP), the PPDU to be transmitted based on a transmission band including first to eighth frequency bands each being contiguous with one another,
wherein the second frequency band is nulled,
wherein the PPDU includes a first signal field to be transmitted on the first frequency band,
wherein the first signal field includes resource unit (RU) information and station (STA) identification information used for data fields included in the first, third, fifth, seventh, fourth, sixth and eighth frequency bands,
wherein the first signal field is duplicated in the third, fifth and seventh frequency bands,
wherein the PPDU includes a fourth signal field to be transmitted on the fourth frequency band,
wherein the fourth signal field includes RU information and STA identification information used for data fields included in the fourth, sixth and eighth frequency bands, and
wherein the fourth signal field is duplicated in the sixth and eighth frequency bands; and
transmitting, by the AP, the PPDU to STAs.
2. The method of claim 1 , wherein the duplicated signal fields are transmitted on a same time duration.
3. The method of claim 1 , wherein each of the first to eighth frequency bands includes a 20 MHz band.
4. The method of claim 1 , wherein
the RU information is related to a RU location in the transmission band.
5. The method of claim 1 ,
wherein
the STA identification information includes association identifiers (AIDs) of the STAs.
6. An apparatus for transmitting a physical layer protocol data unit (PPDU) in a wireless local area network (WLAN) system, the apparatus comprising:
a radio frequency (RF) unit for transmitting a radio signal; and
a processor operatively coupled to the RF unit,
wherein the processor is configured for:
configuring the PPDU to be transmitted based on a transmission band including first to eighth frequency bands each being contiguous with one another,
wherein the second frequency band is nulled,
wherein the PPDU includes a first signal field to be transmitted on the first frequency band,
wherein the first signal field includes resource unit (RU) information and station (STA) identification information used for data fields included in the first, third, fifth, seventh, fourth, sixth and eighth frequency bands,
wherein the first signal field is duplicated in the third, fifth and seventh frequency bands,
wherein the PPDU includes a fourth signal field to be transmitted on the fourth frequency band,
wherein the fourth signal field includes RU information and STA identification information used for data fields included in the fourth, sixth and eighth frequency bands, and
wherein the fourth signal field is duplicated in the sixth and eighth frequency bands; and
transmitting the PPDU to STAs.
7. The apparatus of claim 6 , wherein the duplicated signal fields are transmitted on a same time duration.
8. The apparatus of claim 6 , wherein each of the first to eighth frequency bands includes a 20 MHz band.
9. The apparatus of claim 6 , wherein
the RU information is related to a RU location in the transmission band.
10. The apparatus of claim 6 ,
wherein
the STA identification information includes association identifiers (AIDs) of the STAs.