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 P E + ( 4 × ⌈ TXTIME - T S E - 2 0 4 ⌉ - ( TXTIME - T S E - 2 0 ) ) ≥ 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 transmitting wireless device, the method comprising:
setting a Packet Extension Disambiguity bit of an HE Signal-A (HE-SIG-A) field of a High-Efficiency (HE) PHY Protocol Data Unit (PPDU) having a packet extension to one or zero to indicate whether a last potential OFDM symbol in the HE PPDU is part of the packet extension; and
transmitting the HE PPDU to a recipient wireless device, wherein the recipient wireless device is to be configured to determine a number of data symbols in the HE PPDU using the Packet Extension Disambiguity bit.
2. The method of claim 1 , wherein setting the Packet Extension Disambiguity bit comprises:
determining that the last potential OFDM symbol in the HE PPDU is part of the packet extension when a relationship
T
P
E
+
(
4
×
⌈
TXTIME
-
T
S
E
-
2
0
4
⌉
-
(
TXTIME
-
T
S
E
-
2
0
)
)
≥
T
S
Y
M
is satisfied, where T PE is the duration of the packet extension of the HE PPDU, TXTIME is a transmission time of the HE PPDU, TsE is the duration of the signal extension of the HE PPDU, and T SYM is a duration of symbols in a data field of the HE PPDU;
setting the Packet Extension Disambiguity bit of the HE-SIG-A field of the HE PPDU to one when the last potential OFDM symbol in the HE PPDU is part of the packet extension; and
setting the Packet Extension Disambiguity bit of the HE-SIG-A field of the HE PPDU to zero when the last potential OFDM symbol in the HE PPDU is not part of the packet extension.
3. The method of claim 2 ,
wherein T SE is 6 μs when the transmitting wireless device is operating in a 2.4 GHz band, and 0 μs when the transmitting wireless device is operating in a 5 GHz band, and
wherein generating the HE PPDU further includes:
determining a value L_LENGTH of a Length field of a Non-HT Signal (L-SIG) field of the HE PPDU according to
L_LENGTH
=
⌈
TXTIME
-
T
S
E
-
2
0
4
⌉
×
3
-
3
-
m
,
where m is 1 when the HE PPDU is an HE Multi User (MU) PPDU HE or Extended Range Single User (SU) PPDU and 2 otherwise.
4. The method of claim 2 , further comprising:
when the HE PPDU is an HE Single User (SU) PPDU, determining the transmission time TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration of the HE PPDU, T L-LTF is a Non-HT Long Training Field (LTF) duration of the HE PPDU, T HE-STF-NT is an HE STF duration of the HE PPDU, T L-SIG is a Non-HT Signal (L-SIG) field duration of the HE PPDU, T RL-SIG is a Repeated non-HT SIGNAL field duration of the HE PPDU, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration of the HE PPDU, NSYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in the HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-NT N HE-LTF T HE-LTF-SYM .
5. The method of claim 2 , further comprising:
when the HE PPDU is an HE trigger-based PPDU, determining the transmission time TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration of the HE PPDU, T L-LTF is a Non-HT Long Training Field (LTF) duration of the HE PPDU, T HE-STF-T is an HE STF duration of the HE PPDU, T L-SIG is a Non-HT Signal (L-SIG) field duration of the HE PPDU, T RL-SIG is a Repeated non-HT SIGNAL field duration of the HE PPDU, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration of the HE PPDU, NSYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in the HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-T +N HE-LTF +T HE-LTF-SYM .
6. The method of claim 2 , further comprising:
when the HE PPDU is an HE Multi User (MU) PPDU, determining the transmission time TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
N
HE
-
SIG
-
B
T
HE
-
SIG
-
B
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration of the HE PPDU, T L-LTF is a Non-HT Long Training Field (LTF) duration of the HE PPDU, T HE-STF-NT is an HE STF duration of the HE PPDU, T L-SIG is a Non-HT Signal (L-SIG) field duration of the HE PPDU, T RL-SIG is a Repeated non-HT SIGNAL field duration of the HE PPDU, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration of the HE PPDU, THE-SIG-B is an duration of each OFDM symbol in an HE Signal B (HE-SIG-B) field of the HE PPDU, NHE-SIG-B is a number of symbols in the HE-SIG-B field of the HE PPDU, N SYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in an HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-NT +N HE-LTF ×T HE-LTF-SYM .
7. The method of claim 2 , further comprising:
when the HE PPDU is an HE Extended Range Single User (SU) PPDU, determining the transmission time TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
T
HE
-
SIG
-
A
-
R
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration, T L-LTF is a Non-HT Long Training Field (LTF) duration, T HE-STF-NT is an HE STF duration, T L-SIG is a Non-HT Signal (L-SIG) field duration, T RL-SIG is a repeated non-HT SIGNAL field duration, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration, T HE-SIG-A-R is an HE-SIG-A field duration for Extended Range, NSYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in an HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF +T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-NT +N HE-LTF ×T HE-LTF-SYM .
8. The method of claim 1 , wherein, when the packet extension is present, the packet extension is transmitted with a same average power as a data field of the HE PPDU.
9. The method of claim 1 , further comprising:
setting a pre-Forward Error Correction (pre-FEC) padding factor field of the HE-SIG-A field of the HE PPDU, wherein the recipient wireless device is to be configured to determine the duration of the packet extension based on the pre-FEC padding factor field and a maximum packet extension duration of the recipient wireless device.
10. The method of claim 9 , wherein the recipient wireless device is to be configured to determine that:
when the maximum packet duration of the recipient wireless device is 0 us, the packet extension is not present for the HE PPDU,
when the maximum packet duration of the recipient wireless device is 8 us and (1) the pre-FEC padding factor field has a value of 1, the packet extension is not present for the HE PPDU, (2) the pre-FEC padding factor field has a value of 2, the packet extension is not present for the HE PPDU, (3) the pre-FEC padding factor field has a value of 3, the duration of the packet extension is 4 us, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 8 us, and
when the maximum packet duration of the recipient wireless device is 16 us and (1) the pre-FEC padding factor field has a value of 1, the duration of the packet extension is 4 us, (2) the pre-FEC padding factor field has a value of 2, the duration of the packet extension is 8 us, (3) the pre-FEC padding factor field has a value of 3, the duration of the packet extension is 12 us, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 16 us.
11. A wireless device comprising:
a transmitter circuit;
wherein the wireless device is to:
set a Packet Extension Disambiguity bit of an HE Signal-A (HE-SIG-A) field of a High-Efficiency (HE) PHY Protocol Data Unit (PPDU) having a packet extension to one or zero to indicate whether a last potential OFDM symbol in the HE PPDU is part of the packet extension, and
transmit the HE PPDU to a recipient wireless device, wherein the recipient wireless device is to be configured to determine a number of data symbols in the HE PPDU using the Packet Extension Disambiguity bit.
12. The wireless device of claim 11 , wherein setting the Packet Extension Disambiguity bit comprises:
determining that the last potential OFDM symbol in the HE PPDU is part of the packet extension when a relationship
T
P
E
+
(
4
×
⌈
TXTIME
-
T
S
E
-
2
0
4
⌉
-
(
TXTIME
-
T
S
E
-
2
0
)
)
≥
T
S
Y
M
is satisfied, where TPE is a duration of the packet extension of the HE PPDU, TXTIME is a transmission time of the HE PPDU, TsE is the duration of the signal extension of the HE PPDU, and T SYM is a duration of symbols in a data field of the HE PPDU;
setting the Packet Extension Disambiguity bit of the HE-SIG-A field of the HE PPDU to one when the last potential OFDM symbol in the HE PPDU is part of the packet extension; and
setting the Packet Extension Disambiguity bit of the HE-SIG-A field of the HE PPDU to zero when the last potential OFDM symbol in the HE PPDU is not part of the packet extension.
13. The wireless device of claim 12 ,
wherein T SE is 6 μs when the wireless device is operating in a 2.4 GHz band, and 0 μs when the wireless device is operating in a 5 GHz band, and
wherein generating the HE PPDU further includes:
determine a value L_LENGTH of a Length field of a Non-HT Signal (L-SIG) field of the HE PPDU according to
L_LENGTH
=
⌈
TXTIME
-
T
S
E
-
2
0
4
⌉
×
3
-
3
-
m
,
where m is 1 when the HE PPDU is an HE Multi User (MU) PPDU HE or Extended Range Single User (SU) PPDU and 2 otherwise.
14. The wireless device of claim 12 , further comprising:
when the HE PPDU is an HE Single User (SU) PPDU, the wireless device is to determine the TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration of the HE PPDU, T L-LTF is a Non-HT Long Training Field (LTF) duration of the HE PPDU, T HE-STF-NT is an HE STF duration of the HE PPDU, T L-SIG is a Non-HT Signal (L-SIG) field duration of the HE PPDU, T RL-SIG is a Repeated non-HT SIGNAL field duration of the HE PPDU, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration of the HE PPDU, N SYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in the HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF +T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-NT +N HE-LTF ×T HE-LTF-SYM .
15. The wireless device of claim 12 , further comprising:
when the HE PPDU is an HE trigger-based PPDU, the wireless device is to determine the TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration of the HE PPDU, T L-LTF is a Non-HT Long Training Field (LTF) duration of the HE PPDU, T HE-STF-T is an HE STF duration of the HE PPDU, T L-SIG is a Non-HT Signal (L-SIG) field duration of the HE PPDU, T RL-SIG is a Repeated non-HT SIGNAL field duration of the HE PPDU, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration of the HE PPDU, N SYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in the HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF TL-LTF , and T HE-PREAMBLE is equal to T HE-STF-T +N HE-LTF ×T HE-LTF-SYM .
16. The wireless device of claim 12 , further comprising:
when the HE PPDU is an HE Multi User (MU) PPDU, the wireless device is to determine the TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
N
HE
-
SIG
-
B
+
T
HE
-
SIG
-
B
+
T
HE
-
PREAMBLE
+
N
SYM
T
SYM
+
T
PE
+
T
SE
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration of the HE PPDU, T L-LTF is a Non-HT Long Training Field (LTF) duration of the HE PPDU, T HE-STF-NT is an HE STF duration of the HE PPDU, T L-SIG is a Non-HT Signal (L-SIG) field duration of the HE PPDU, T RL-SIG is a Repeated non-HT SIGNAL field duration of the HE PPDU, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration of the HE PPDU, T HE-SIG-B is an duration of each OFDM symbol in an HE Signal B (HE-SIG-B) field of the HE PPDU, N HE-SIG-B is a number of symbols in the HE-SIG-B field of the HE PPDU, N SYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in an HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF +T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-NT +N HE-LTF ×T HE-LTF-SYM .
17. The wireless device of claim 12 , further comprising:
when the HE PPDU is an HE Extended Range Single User (SU) PPDU, the wireless device is to determine the TXTIME according to:
TXTIME
=
T
LEG
-
PREAMBLE
+
T
L
-
SIG
+
T
RL
-
SIG
+
T
HE
-
SIG
-
A
+
T
HE
-
SIG
-
A
-
R
+
T
HE
-
P
R
E
A
M
B
L
E
+
N
S
Y
M
T
S
Y
M
+
T
P
E
+
T
S
E
where T L-STF is a Non-High Throughput (non-HT) Short Training Field (STF) duration, T L-LTF is a Non-HT Long Training Field (LTF) duration, T HE-STF-NT is an HE STF duration, T L-SIG is a Non-HT Signal (L-SIG) field duration, T RL-SIG is a repeated non-HT SIGNAL field duration, T HE-SIG-A is an HE Signal A (HE-SIG-A) field duration, T HE-SIG-A-R is an HE-SIG-A field duration for Extended Range, N SYM is a number of symbols in a data field of the HE PPDU, T HE-LTF-SYM is a duration of each Orthogonal Frequency Division Modulation (OFDM) symbol, including Guard Interval (GI), in an HE-LTF field of the HE PPDU, N HE-LTF is a number of symbols in an HE LTF field of the HE PPDU, T LEG-PREAMBLE is equal to T L-STF +T L-LTF , and T HE-PREAMBLE is equal to T HE-STF-NT +N HE-LTF ×T HE-LTF-SYM .
18. The wireless device of claim 11 , wherein, when the packet extension is present, the packet extension is transmitted with a same average power as a data field of the HE PPDU.
19. The wireless device of claim 11 , further comprising:
setting a pre-Forward Error Correction (pre-FEC) padding factor field of the HE-SIG-A field of the HE PPDU, wherein the recipient wireless device is to be configured to determine the duration of the packet extension based on the pre-FEC padding factor field and a maximum packet extension duration of the recipient wireless device.
20. The wireless device of claim 19 , wherein the recipient wireless device is to be configured to determine that:
when the maximum packet duration of the recipient wireless device is 0 us, the packet extension is not present for the HE PPDU,
when the maximum packet duration of the recipient wireless device is 8 us and (1) the pre-FEC padding factor field has a value of 1, the packet extension is not present for the HE PPDU, (2) the pre-FEC padding factor field has a value of 2, the packet extension is not present for the HE PPDU, (3) the pre-FEC padding factor field has a value of 3, the duration of the packet extension is 4 us, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 8 us, and
when the maximum packet duration of the recipient wireless device is 16 us and (1) the pre-FEC padding factor field has a value of 1, the duration of the packet extension is 4 us, (2) the pre-FEC padding factor field has a value of 2, the duration of the packet extension is 8 us, (3) the pre-FEC padding factor field has a value of 3, the duration of the packet extension is 12 us, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 16 us.