Method for transmitting and receiving frame
A frame transmission method is provided by a device in a wireless communication network. The device generates a signal field including a symbol using a 64 FFT and carrying signaling information, and generates a data field including a symbol using a FFT having a larger size than the 64 FFT and carrying data. The device transmits a frame including the signal field and the data field.
1. A transmitting device for transmitting a frame in a wireless communication network, the transmitting device comprising:
a processing device; and
a set of memory units that store instructions, which when executed by the processing device cause the transmitting device to:
generate a High Efficiency Signal A (HE-SIG-A) field, including a symbol having a first subcarrier spacing, the HE-SIG-A field carrying common signaling information for a set of receiving devices, the HE-SIG-A field being repeated in one or more 20 MHz bands of a bandwidth of the frame,
generate a data field, including a symbol having a second subcarrier spacing narrower than the first subcarrier spacing,
generate a High Efficiency Signal B (HE-SIG-B) field carrying HE-SIG-B information in a band of the bandwidth of the frame, the HE-SIG-B information including signaling information for the set of receiving devices, wherein the HE-SIG-B field includes a first part that occupies a first portion of the band of the bandwidth of the frame and a second part that occupies a second portion of the band of the bandwidth of the frame, wherein the first part includes the signaling information and the second part includes a duplicate of the signaling information, and
transmit the frame, including the HE-SIG-A field, the HE-SIG-B field, and the data field, wherein the HE-SIG-A field is immediately followed in the frame by the HE-SIG-B field.
2. The transmitting device of claim 1 , wherein a Fast Fourier Transform (FFT) period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing.
3. The transmitting device of claim 1 , wherein the second subcarrier spacing is ¼ of the first subcarrier spacing.
4. The transmitting device of claim 1 , wherein the instructions further cause the transmitting device to generate a set of high-efficiency long-training fields (HE-LTFs) for channel estimation,
wherein the long training field includes another symbol having the second subcarrier spacing.
5. The transmitting device of claim 4 , wherein the instructions further cause the transmitting device to:
generate a high-efficiency short-training field (HE-STF) for automatic gain control; and
wherein transmitting the frame includes transmitting the HE-STF and the set of HE-LTFs along with the HE-SIG-A field, the HE-SIG-B field, and the data field, and
wherein, in the frame, the HE-SIG-B field is immediately followed by the HE-STF, the HE-STF is immediately followed by the set of HE-LTFs, and the set of HE-LTFs is immediately followed by the data field.
6. The transmitting device of claim 1 , wherein the first portion and the second portion are a same width.
7. The transmitting device of claim 1 , wherein the instructions further cause the transmitting device to:
transmit a guard interval for the symbol having the second subcarrier spacing selected out of a set of guard intervals according to a user or according to a current condition of a channel,
wherein a first guard interval in the set of guard intervals has a duration of 0.8 μs, a second guard interval in the set of guard intervals has a duration of 1.6 μs, and a third guard interval in the set of guard intervals has a duration of 3.2 μs.
8. A receiving device for processing a frame in a wireless communication network, the receiving device comprising:
a processing device; and
a set of memory units that store instructions, which when executed by the processing device cause the receiving device to:
decode a High Efficiency Signal A (HE-SIG-A) field, including a symbol having a first subcarrier spacing, the HE-SIG-A field carrying signaling information for a set of devices, including the receiving device, the HE-SIG-A field being repeated in one or more 20 MHz bands of a bandwidth of the frame, wherein the decoding of the HE-SIG-A field is on a basis of the first subcarrier spacing,
decode a High Efficiency Signal B (HE-SIG-B) field carrying HE-SIG-B information in a band of the bandwidth of the frame, the HE-SIG-B information including signaling information for the set of devices, wherein the HE-SIG-B field includes a first part that occupies a first portion of the band of the bandwidth of the frame and a second part that occupies a second portion of the band of the bandwidth of the frame, wherein the first part includes the signaling information and the second part includes a duplicate of the signaling information, and
decode a data field, including a symbol having a second subcarrier spacing narrower than the first subcarrier spacing, wherein decoding the symbol of the data field is on a basis of the second subcarrier spacing and the HE-SIG-B field.
9. The receiving device of claim 8 , wherein a Fast Fourier Transform (FFT) period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing.
10. The receiving device of claim 8 , wherein the second subcarrier spacing is ¼ of the first subcarrier spacing.
11. The receiving device of claim 8 , wherein the instructions further cause the receiving device to decode a set of high-efficiency long-training fields (HE-LTFs) for channel estimation,
wherein the long training field includes another symbol having the second subcarrier spacing.
12. The receiving device of claim 11 , wherein the instructions further cause the receiving device to:
decode a high-efficiency short-training field (HE-STF) for automatic gain control; and
wherein, in the frame, the HE-SIG-B field is immediately followed by the HE-STF, the HE-STF is immediately followed by the set of HE-LTFs, and the set of HE-LTFs is immediately followed by the data field.
13. The receiving device of claim 8 , wherein the first portion and the second portion are a same width.
14. The receiving device of claim 8 , wherein the instructions further cause the receiving device to:
process a guard interval for the symbol having the second subcarrier spacing selected out of a set of guard intervals according to a user or according to a current condition of a channel,
wherein the guard interval has a duration of 0.8 μs, 1.6 μs, or 3.2 μs.
15. A non-transitory machine-readable storage medium that includes instructions, which when executed by a processor of a receiving device operating in a wireless communication network, cause the receiving device to:
decode a High Efficiency Signal A (HE-SIG-A) field of a frame, including a symbol having a first subcarrier spacing, the HE-SIG-A field carrying signaling information for a set of devices, including the receiving device, the HE-SIG-A field being repeated in one or more 20 MHz bands of a bandwidth of the frame, wherein the decoding of the HE-SIG-A field is on a basis of the first subcarrier spacing;
decode a High Efficiency Signal B (HE-SIG-B) field carrying HE-SIG-B information in a band of the bandwidth of the frame, the HE-SIG-B information including signaling information for the set of devices, wherein the HE-SIG-B field includes a first part that occupies a first portion of the band of the bandwidth of the frame and a second part that occupies a second portion of the band of the bandwidth of the frame, wherein the first part includes the signaling information and the second part includes a duplicate of the signaling information; and
decode a data field, including a symbol having a second subcarrier spacing narrower than the first subcarrier spacing, wherein decoding the symbol of the data field is on a basis of the second subcarrier spacing and the HE-SIG-B field.
16. The non-transitory machine-readable storage medium of claim 15 , wherein a Fast Fourier Transform (FFT) period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing.
17. The non-transitory machine-readable storage medium of claim 15 , wherein the second subcarrier spacing is ¼ of the first subcarrier spacing.
18. The non-transitory machine-readable storage medium of claim 15 , wherein the instructions further cause the receiving device to decode a set of high-efficiency long-training fields (HE-LTFs) for channel estimation,
wherein the long training field includes another symbol having the second subcarrier spacing.
19. The non-transitory machine-readable storage medium of claim 18 , wherein the instructions further cause the receiving device to:
decode a high-efficiency short-training field (HE-STF) for automatic gain control; and
wherein, in the frame, the HE-SIG-B field is immediately followed by the HE-STF, the HE-STF is immediately followed by the set of HE-LTFs, and the set of HE-LTFs is immediately followed by the data field.
20. The non-transitory machine-readable storage medium of claim 15 , wherein the first portion and the second portion are a same width.