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 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) to one or zero based on (1) a duration of a packet extension of the HE PPDU and (2) a duration of a signal extension of the HE PPDU, wherein, when the packet extension is present, the duration of the packet extension is an integer multiple of 4 μs and the packet extension provides additional receive processing time for a recipient wireless device; and
transmitting the HE PPDU to the 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 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 of the HE PPDU, TXTIME is a transmission time of the HE PPDU, T SE 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 relationship is satisfied; and
setting the Packet Extension Disambiguity bit of the HE-SIG-A field of the HE PPDU to zero when the relationship is not satisfied.
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
SE
-
20
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, 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 .
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, 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-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, 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 .
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, 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 .
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 μs, the packet extension is not present for the HE PPDU,
when the maximum packet duration of the recipient wireless device is 8 μs 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 μs, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 8 μs, and
when the maximum packet duration of the recipient wireless device is 16 μs and (1) the pre-FEC padding factor field has a value of 1, the duration of the packet extension is 4 μs, (2) the pre-FEC padding factor field has a value of 2, the duration of the packet extension is 8 μs, (3) the pre-FEC padding factor field has a value of 3, the duration of the packet extension is 12 μs, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 16 μs.
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) to one or zero based on (1) a duration of a packet extension of the HE PPDU and (2) a duration of a signal extension of the HE PPDU, wherein, when the packet extension is present, the duration of the packet extension is an integer multiple of 4 μs and the packet extension provides additional receive processing time for a recipient wireless device, and
transmit the HE PPDU to the 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 whether a relationship
T
PE
+
(
4
×
⌈
TXTIME
-
T
SE
-
20
4
⌉
-
(
TXTIME
-
T
SE
-
20
)
)
≥
T
SYM
is satisfied, where T PE is a duration of the packet extension of the HE PPDU, TXTIME is a transmission time of the HE PPDU, T SE 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 relationship is satisfied; and
setting the Packet Extension Disambiguity bit of the HE-SIG-A field of the HE PPDU to zero when the relationship is not satisfied.
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
SE
-
20
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 +T L-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
-
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, 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 μs, the packet extension is not present for the HE PPDU,
when the maximum packet duration of the recipient wireless device is 8 μs 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 μs, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 8 μs, and
when the maximum packet duration of the recipient wireless device is 16 μs and (1) the pre-FEC padding factor field has a value of 1, the duration of the packet extension is 4 μs, (2) the pre-FEC padding factor field has a value of 2, the duration of the packet extension is 8 μs, (3) the pre-FEC padding factor field has a value of 3, the duration of the packet extension is 12 μs, and (4) the pre-FEC padding factor field has a value of 4, the duration of the packet extension is 16 μs.