SIGNALING IN A HIGH EFFICIENCY WIRELESS NETWORK
A wireless device generating a High-Efficiency (HE) PHY Protocol Data Unit (PPDU) for transmission sets a Packet Extension Disambiguity bit of an HE Signal-A (HE-SIG-A) field of the HE PPDU based on respective durations of a packet extension of the HE PPDU and a signal extension of the HE PPDU. The wireless device may determine whether a relationship T PE + ( 4 × ⌈ TXTIME - T SE - 20 4 ⌉ - ( TXTIME - T SE - 20 ) ) ≥ T SYM is satisfied, where T PE is the duration of the packet extension, TXTIME is a transmission time of the HE PPDU, T SE is the duration of the signal extension, and T SYM is a duration of symbols in a data field of the HE PPDU. The wireless device may set the Packet Extension Disambiguity bit to one when the relationship is satisfied; and to zero when the relationship is not satisfied.
1 . A method performed by a receiving wireless device, the method comprising:
receiving a High-Efficiency (HE) PHY Protocol Data Unit (PPDU) including a data field;
estimating a duration of a data field;
determining a number of symbols in the data field according to
N
SYM
=
⌊
T
DATA
_
EST
T
SYM
⌋
-
b
2
wherein N SYM is the number of symbols, T DATA_EST is the estimated duration of the data field, T SYM is a duration of a symbol included in the data field, and b 2 is a value of a Packet Extension (PE) Disambiguity bit of a PE field of an HE Signal A (HE-SIG-A) field of the HE PPDU;
determining a duration of a packet extension of the HE PPDU according to
T
PE
=
⌊
T
DATA
_
EST
-
(
N
SYM
×
T
SYM
)
4
⌋
×
4
μ
s
;
wherein T PE is the duration of the packet extension; and
determining a state of a primary channel used to receive the HE PPDU as idle after waiting for the duration of the packet extension.