Method and apparatus for sending and receiving signaling in wireless local area network
The method includes generating, by an access point (AP), signaling that includes an AP identifier (ID) field, a bandwidth (BW) field, a guard interval (GI) field, a cyclic redundancy check (CRC) field, and a tail field, the AP ID field is used to indicate an ID of the AP, the BW field is used to indicate bandwidth required for data transmission subsequent to the signaling, the GI is used to indicate a length of a cyclic prefix (CP) required for data transmission subsequent to the signaling, the CRC field is used to guard a field before the CRC field in the signaling, and the Tail field is used to empty an encoder and a decoder, where the CRC field and the Tail field are the last two fields of the signaling. The method also includes sending, by the AP, the signaling.
1. An apparatus, comprising:
a processor, configured to generate a physical protocol data unit (PPDU) for a downlink multiple-user transmission, wherein the PPDU includes: a legacy preamble, a high efficiency Wi-Fi Signaling Field 1 (HEW-SIG1), a high efficiency Wi-Fi Signaling Field 2 (HEW-SIG2), adjacent to the HEW-SIG1, and a data portion, and wherein the HEW-SIG1 comprises a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field, the HEW-SIG2 MCS field indicates a transmission modulation and coding scheme (MCS) used to transmit the HEW-SIG2, the HEW-SIG1 further comprises a frame structure indication field, and the frame structure indication field indicates whether a frame structure of a scheduling transmission is an uplink structure or a downlink structure, and the HEW-SIG2 comprises resource indication information; and
a transmitter coupled to the processor, wherein the transmitter is configured to send the PPDU in a wireless local area network (WLAN).
2. The apparatus according to claim 1 , wherein the resource indication information in the HEW-SIG2 comprises resource locations for communicating data by multiple users.
3. The apparatus according to claim 1 , wherein the HEW-SIG1 further comprises a HEW-SIG2 length field, and the HEW-SIG2 length field indicates a length of HEW-SIG2 signaling.
4. The apparatus according to claim 1 , wherein the HEW-SIG1 further comprises a duration field, and the duration field indicates a remaining duration of occupying a channel.
5. The apparatus according to claim 1 , wherein the legacy preamble includes: a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signaling (L-SIG) located after the L-LTF, and wherein the L-SIG includes information usable for identifying a rate and length information of the PPDU.
6. The apparatus according to claim 1 , wherein the HEW-SIG1 further comprises a transition time field indicating a downlink-uplink transition time point.
7. The apparatus according to claim 1 , wherein the apparatus is an access point.
8. The apparatus according to claim 1 , wherein the apparatus is a chip in an access point.
9. An apparatus, comprising:
a receiver, configured to receive a physical protocol data unit (PPDU) for a downlink multiple-user transmission, wherein the PPDU includes: a legacy preamble, a high efficiency Wi-Fi Signaling Field 1 (HEW-SIG1), a high efficiency Wi-Fi Signaling Field 2 (HEW-SIG2) adjacent to the HEW-SIG1, and a data portion, and wherein the HEW-SIG1 comprises a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field, the HEW-SIG2 MCS field indicates a transmission modulation and coding scheme (MCS) used to transmit the HEW-SIG2, the HEW-SIG1 further comprises a frame structure indication field, and the frame structure indication field indicates whether a frame structure of a scheduling transmission is an uplink structure or a downlink structure, and the HEW-SIG2 comprises resource indication information; and
a processor coupled to the receiver, wherein the processor is configured to parse the PPDU to obtain the data portion according to the HEW-SIG1 and the HEW-SIG2; and
wherein the apparatus is applied in a wireless local area network (WLAN).
10. The apparatus according to claim 9 , wherein the resource indication information in the HEW-SIG2 comprises resource locations for communicating data by multiple users.
11. The apparatus according to claim 9 , wherein the HEW-SIG1 further comprises a HEW-SIG2 length field, and the HEW-SIG2 length field indicates a length of HEW-SIG2 signaling.
12. The apparatus according to claim 9 , wherein the HEW-SIG1 further comprises a duration field, and the duration field indicates a remaining duration of occupying a channel.
13. The apparatus according to claim 9 , wherein the legacy preamble includes: a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signaling (L-SIG) located after the L-LTF, and wherein the L-SIG includes information for identifying a rate and length information of the PPDU.
14. The apparatus according to claim 9 , wherein the HEW-SIG1 further comprises a transition time field indicating a downlink-uplink transition time point.
15. The apparatus according to claim 9 , wherein the apparatus is a station.
16. The apparatus according to claim 9 , wherein the apparatus is a chip in a station.
17. The apparatus according to claim 1 , wherein the HEW-SIG2 MCS field is located in the HEW-SIG1 field between a guard interval (GI) and a HEW-SIG2 length field.
18. The apparatus according to claim 17 , wherein the HEW-SIG2 MCS field is two bits, the HEW-SIG2 length field is five bits, and the GI field is two bits.
19. The apparatus according to claim 1 , wherein the HEW-SIG1 field further comprises, in sequence, an access point identifier field, a bandwidth field, a guard interval field, the HEW-SIG2 MCS field, a HEW-SIG2 length field, and a frame structure identifier field.
20. The apparatus according to claim 19 , wherein the access point identifier field is a longest field in the HEW-SIG1 field.