Method and apparatus for sending and receiving signaling in wireless local area network
A 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. A method, comprising:
generating, by an access point (AP), a data frame, wherein the data frame includes a high efficiency Wi-Fi Signaling Field 1 (HEW-SIG1), the HEW-SIGs comprises a frame structure indication field, and the frame structure indication field indicates a frame structure of a scheduling transmission, wherein the frame structure of the scheduling transmission comprises an uplink structure or a downlink structure, the scheduling transmission of the data frame is a multi-user transmission, the data frame further comprises a high efficiency Wi-Fi Signaling Field 2 (HEW-SIG2), the HEW-SIG2 is adjacent to the HEW-SIGs in the data frame, the HEW-SIG2 comprises resource indication information, and the HEW-SIGs further comprises a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field, and the HEW-SIG2 MCS field indicates a transmission modulation and coding scheme (MCS) of the HEW-SIG2; and
sending, by the AP, the data frame.
2. The method according to claim 1 , wherein the resource indication information in the HEW-SIG2 comprises resource locations for communicating data by multiple users.
3. The method according to claim 1 , wherein the HEW-SIGs further comprises a transition time field indicating a downlink-uplink transition time point, and a value M of the transition time field is:
M =( T −End time of the HEW-SIG2)/Time domain length of each resource unit of the scheduling transmission; and
wherein T is the downlink-uplink transition time point.
4. The method according to claim 1 , wherein the HEW-SIGs further comprises a HEW-SIG2 length field and a duration field, wherein the HEW-SIG2 length field indicates a length of HEW-SIG2 signaling, and the duration field indicates a remaining duration of occupying a channel.
5. A method, comprising:
receiving, by a station, a data frame, wherein the data frame includes a high efficiency Wi-Fi Signaling Field 1 (HEW-SIG1), the HEW-SIGs comprises a frame structure indication field, the frame structure indication field indicates a frame structure of a scheduling transmission, wherein the frame structure of the scheduling transmission comprises an uplink structure or a downlink structure, the scheduling transmission of the data frame is a multi-user transmission, wherein the data frame further comprises a high efficiency Wi-Fi Signaling Field 2 (HEW-SIG2), the HEW-SIG2 is adjacent to the HEW-SIGs in the data frame, the HEW-SIG2 comprises resource indication information, the HEW-SIGs further comprises a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field, and the HEW-SIG2 MCS field indicates a transmission modulation and coding scheme (MCS) of the HEW-SIG2; and
parsing, by the station, the data frame to obtain the HEW-SIGs and the HEW-SIG2.
6. The method according to claim 5 , wherein the resource indication information in the HEW-SIG2 comprises resource locations for communicating data by multiple users.
7. The method according to claim 6 , further comprising:
determining, by the station, resource locations for the station to use to communicate data according to the resource indication information in the HEW-SIG2; and
communicating, by the station, the data at the resource locations for the station to use to communicate data.
8. The method according to claim 5 , wherein the HEW-SIGs further comprises a transition time field indicating a downlink-uplink transition time point.
9. The method according to claim 8 , further comprising:
determining, by the station, the downlink-uplink transition time point according to a value of the transition time field, a time domain length of a resource unit, and an end time of the signaling with reference to a preset formula, where the preset formula includes:
Transition time point=Value of transition time field×Time domain length of the resource unit+End time of the next signaling.
10. The method according to claim 5 , wherein the HEW-SIGs further comprises a HEW-SIG2 length field and a duration field, wherein the HEW-SIG2 length field indicates a length of HEW-SIG2 signaling, and the duration field indicates a remaining duration of occupying a channel.
11. An apparatus, comprising:
a processor, configured to generate a data frame, wherein the data frame includes a high efficiency Wi-Fi Signaling Field 1 (HEW-SIG1), the HEW-SIGs comprises a frame structure indication field, and the frame structure indication field indicates a frame structure of a scheduling transmission, wherein the frame structure of the scheduling transmission comprises an uplink structure or a downlink structure, the scheduling transmission of the data frame is a multi-user transmission, the data frame further comprises a high efficiency Wi-Fi Signaling Field 2 (HEW-SIG2), the HEW-SIG2 is adjacent to the HEW-SIGs in the data frame, the HEW-SIG2 comprises resource indication information, the HEW-SIGs further comprises a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field, and the HEW-SIG2 MCS field indicates a transmission modulation and coding scheme (MCS) of the HEW-SIG2; and
a transmitter coupled to the processor, wherein the transmitter is configured to send the data frame.
12. The apparatus according to claim 11 , wherein the resource indication information in the HEW-SIG2 comprises resource locations for communicating data by multiple users.
13. The apparatus according to claim 11 , wherein the HEW-SIGs further comprises transition time field indicating a downlink-uplink transition time point, and a value M of the transition time field is:
M =( T −End time of the HEW-SIG2)/Time domain length of each resource unit of the scheduling transmission; and
wherein T is the downlink-uplink transition time point.
14. The apparatus according to claim 11 , wherein the HEW-SIGs further comprises: a HEW-SIG2 length field and a duration field, wherein the HEW-SIG2 length field is indicates a length of HEW-SIG2 signaling, and the duration field indicates a remaining duration of occupying a channel.
15. An apparatus, comprising:
a receiver, configured to receive a data frame, wherein the data frame includes a high efficiency Wi-Fi Signaling Field 1 (HEW-SIG1), the HEW-SIGs comprises a frame structure indication field, the frame structure indication field indicates a frame structure of a scheduling transmission, wherein the frame structure of the scheduling transmission comprises an uplink structure or a downlink structure, the scheduling transmission of the data frame is a multi-user transmission, the data frame further comprises a high efficiency Wi-Fi Signaling Field 2 (HEW-SIG2), the HEW-SIG2 is adjacent to the HEW-SIGs in the data frame, the HEW-SIG2 comprises resource indication information, the HEW-SIGs further comprises a HEW-SIG2 modulation and coding scheme (HEW-SIG2 MCS) field, and the HEW-SIG2 MCS field indicates a transmission modulation and coding scheme (MCS) of the HEW-SIG2; and
a processor coupled to the receiver, wherein the processor is configured to parse the data frame to obtain the HEW-SIGs and the HEW-SIG2.
16. The apparatus according to claim 15 , wherein the resource indication information in the HEW-SIG2 comprises resource locations for communicating data by multiple users.
17. The apparatus according to claim 16 , wherein:
the processor is further configured to:
determine resource locations for communicating data by the apparatus according to the resource indication information in the HEW-SIG2; and
the receiver is further configured to communicate data at the resource locations.
18. The apparatus according to claim 15 , wherein the HEW-SIGs further comprises a transition time field indicating a downlink-uplink transition time point.
19. The apparatus according to claim 18 , wherein the processor is further configured to:
determine the downlink-uplink transition time point according to a value of the transition time field, a time domain length of a resource unit, and an end time of the signaling with reference to a preset formula, where the preset formula includes:
Transition time point=Value of transition time field×Time domain length of the resource unit+End time of the next signaling.
20. The apparatus according to claim 15 , wherein the HEW-SIGs further comprises: a HEW-SIG2 length field and a duration field, wherein the HEW-SIG2 length field indicates a length of HEW-SIG2 signaling, and the duration field indicates a remaining duration of occupying a channel.