Transmission of punctured null data packets and partial bandwidth feedback

Abstract

A technique for wireless communication of a punctured null data packet with a long training field sequence is disclosed. The long training field (LTF) sequence is generated for the null data packet (NDP) for transmission over a channel having a bandwidth that is an integer multiple of 80 MHz. The LTF sequence is modulated onto a plurality of tones of the channel excluding tones within a punctured subchannel of a plurality of subchannels of the channel. The modulation may be based on a size and location of the punctured subchannel and a symbol duration associated with transmitting the LTF sequence. The NDP is transmitted including the LTF sequence to a second wireless communication device via the channel. A partial bandwidth feedback may be received in response to the LTF in the punctured NDP.

What is claimed is: 
     
         1 . A method for wireless communication by a wireless communication device, comprising:
 modulating a long training field (LTF) sequence for a null data packet (NDP) onto a plurality of tones of a wireless channel that includes one or more 80 MHz bandwidth segments, the modulation excluding tones within a punctured subchannel of a plurality of subchannels of an 80 MHz bandwidth segment of the wireless channel, the modulation being based on a size and a location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence, wherein:
 (a) the symbol duration associated with the LTF sequence is 12.8 μs plus a guard interval, the LTF sequence is modulated onto each tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment comprises 1001 tones, and the plurality of tone ranges include:
 tones [−253:−12, 12:253, 259:500] based on the punctured subchannel being a first 20 MHz subchannel; 
 tones [−500:−259, 12:253, 259:500] based on the punctured subchannel being a second 20 MHz subchannel adjacent the first 20 MHz subchannel; 
 tones [−500:−259, −253:−12, 259:500] based on the punctured subchannel being a third 20 MHz subchannel adjacent the second 20 MHz subchannel; or 
 tones [−500:−259, −253:−12, 12:253] based on the punctured subchannel being a fourth 20 MHz subchannel adjacent the third 20 MHz subchannel, 
 
 (b) the symbol duration associated with the LTF sequence is 12.8 μs plus the guard interval, the LTF sequence is modulated onto each tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment comprises 1001 tones, and the plurality of tone ranges include:
 tones [12:253, 259:500] based on the punctured subchannel being a first 40 MHz subchannel; or 
 tones [−500:−259, −253:−12] based on the punctured subchannel being a second 40 MHz subchannel adjacent the first 40 MHz subchannel, 
 
 (c) the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, the LTF sequence is modulated onto every other tone within a plurality of tones ranges of the OFDMA data tone plan, the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment comprises 1001 tones, and the plurality of tone ranges include:
 tones [−252:2:−12, 12:2:252, 260:2:500] based on the punctured subchannel being a first 20 MHz subchannel; 
 tones [−500:2:−260, 12:2:252, 260:2:500] based on the punctured subchannel being a second 20 MHz subchannel adjacent the first 20 MHz subchannel; 
 tones [−500:2:−260, −252:2:−12, 260:2:500] based on the punctured subchannel being a third 20 MHz subchannel adjacent the second 20 MHz subchannel; or 
 tones [−500:2:−260, −252:2:−12, 12:2:252] based on the punctured subchannel being a fourth 20 MHz subchannel adjacent the third 20 MHz subchannel, or 
 
 (d) the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, the LTF sequence is modulated onto every other tone within a plurality of tones ranges of the OFDMA data tone plan, the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment comprises 1001 tones, and the plurality of tone ranges include:
 tones [12:2:252, 260:2:500] based on the punctured subchannel being a first 40 MHz subchannel; or 
 tones [−500:2:−260, −252:2:−12] based on the punctured subchannel being a second 40 MHz subchannel adjacent the first 40 MHz subchannel; and 
 
   transmitting the NDP including the modulated LTF sequence to a second wireless communication device via the wireless channel.