Doppler mode in a wireless network
To receive data in data field of a PHY Protocol Data Unit (PPDU), wherein the data field includes mid-ambles, a number of mid-ambles and a number of data symbols included in the data field is determined. The number of mid-ambles is determined according to information in an HE-SIG-A field of the PPDU, information in an L-SIG field of the PPDU, and one or more predetermined values prescribed by a standard. The number of data symbols may be determined using the number of the mid-ambles, and the data received according to the number of mid-ambles and the number of data symbols.
1. A method performed by a wireless device, the method comprising:
receiving a first portion of a PHY Protocol Data Unit (PPDU), the first portion including a Legacy Signal (L-SIG) field;
decoding the L-SIG field;
determining a format of the PPDU using the first portion; and
in response to determining that the format of the PPDU is a High Efficiency (HE) format:
receiving and decoding an HE Signal A (HE-SIG-A) field,
determining, using a Doppler field of the HE-SIG-A field, whether the PPDU includes mid-ambles, and
in response to determining that the PPDU includes mid-ambles:
determining, according to the format of the PPDU and using first information determined using the HE-SIG-A field and second information determined using the L-SIG field, a number of mid-ambles N MA indicating the number of mid-ambles included in a data field of the PPDU,
wherein the number of mid-ambles N MA is determined without using a number of data symbols N SYM included in the data field of the PPDU;
determining, using the number of the mid-ambles N MA , the number of data symbols N SYM included in the data field of the PPDU; and
receiving, using the number of mid-ambles N MA and the number of data symbols N SYM , the data field of the PPDU.
2. The method of claim 1 , wherein the first information includes a Packet Extension (PE) Disambiguity bit value b PE-Disambiguity , a number of HE Long Training Fields (HE-LTFs) value N HE-LTF , an HE-LTF duration including guard interval T HE-LTF , and a mid-amble periodicity M.
3. The method of claim 2 , wherein the first information further includes a preamble duration T PA according to the format of the PPDU.
4. The method of claim 2 , wherein the first information further includes a mid-amble duration T MA .
5. The method of claim 1 , wherein the second information includes a Length field value L_LENGTH.
6. The method of claim 1 , wherein determining the number of mid-ambles N MA includes determining the number of mid-ambles N MA according to:
N
MA
=
⌊
L_LENGTH
+
m
+
3
3
×
4
-
T
PA
-
T
SYM
(
1
+
β
+
b
PE
-
Disambiguity
)
T
MA
+
M
·
T
SYM
⌋
wherein
L_LENGTH is the value of a LENGTH field of the L-SIG field,
m is 1 when the format of the PPDU is an HE Multi-User PPDU or HE Extended Range Single User PPDU format and m is 2 otherwise,
T PA is a preamble duration,
T SYM is a data symbol duration,
β is an integer number greater than or equal to zero,
b PE-Disambiguity is a Packet Extension (PE) Disambiguity bit value,
T MA is a mid-amble duration, and
M is a mid-amble periodicity.
7. The method of claim 1 , wherein determining the number of mid-ambles N MA includes determining the number of mid-ambles N MA according to:
N
MA
=
⌈
L_LENGTH
+
m
+
3
3
×
4
-
T
PA
-
T
SYM
(
1
+
β
+
b
PE
-
Disambiguity
+
M
)
T
MA
+
M
·
T
SYM
⌉
wherein
L_LENGTH is the value of a LENGTH field of the L-SIG field,
m is 1 when the format of the PPDU is an HE Multi-User PPDU or HE Extended Range Single User PPDU format and m is 2 otherwise,
T PA is a preamble duration,
T SYM is a data symbol duration,
β is an integer number greater than or equal to zero,
b PE-Disambiguity is a Packet Extension (PE) Disambiguity bit value,
T MA is a mid-amble duration, and
M is a mid-amble periodicity.
8. The method of claim 1 , wherein receiving the data field comprises:
repeating, a number of times equal to the number of mid-ambles N MA :
receiving a plurality of consecutive data symbols, wherein the number of data symbols in the plurality of data symbols is equal to a mid-amble periodicity M, and
receiving a mid-amble immediately following the plurality of consecutive data symbols; and
receiving a remaining 0 or more remaining consecutive data symbols, wherein the number of remaining consecutive data symbols Nremain is equal to:
N remain= N SYM −( M·N MA ).
9. A wireless device comprising:
a receiver; and
a processor, the processor configured to perform:
receiving, using the receiver, a first portion of a PHY Protocol Data Unit (PPDU), the first portion including a Legacy Signal (L-SIG) field;
decoding the L-SIG field;
determining a format of the PPDU using the first portion; and
in response to determining that the format of the PPDU is a High Efficiency (HE) format:
receiving and decoding an HE Signal A (HE-SIG-A) field,
determining, using a Doppler field of the HE-SIG-A field, whether the PPDU includes mid-ambles, and
in response to determining that the PPDU includes mid-ambles:
determining, according to the format of the PPDU and using first information determined using the HE-SIG-A field and second information determined using the L-SIG field, a number of mid-ambles N MA indicating the number of mid-ambles included in a data field of the PPDU,
wherein the number of mid-ambles N MA is determined without using a number of data symbols N SYM included in the data field of the PPDU;
determining, using the number of the mid-ambles N MA , the number of data symbols N SYM included in the data field of the PPDU; and
receiving, using the number of mid-ambles N MA and the number of data symbols N SYM , the data field of the PPDU.
10. The wireless device of claim 9 , wherein the first information includes a Packet Extension (PE) Disambiguity bit value b PE-Disambiguity , a number of HE Long Training Fields (HE-LTFs) value N HE-LTF , an HE-LTF duration including guard interval T HE-LTF , and a mid-amble periodicity M.
11. The wireless device of claim 10 , wherein the first information further includes a preamble duration T PA according to the format of the PPDU.
12. The wireless device of claim 10 , wherein the first information further includes a mid-amble duration T MA .
13. The wireless device of claim 9 , wherein the second information includes a Length field value L_LENGTH.
14. The wireless device of claim 9 , wherein determining the number of mid-ambles N MA includes determining the number of mid-ambles N MA according to:
N
M
A
=
⌊
L_LENGTH
+
m
+
3
3
×
4
-
T
P
A
-
T
S
Y
M
(
1
+
β
+
b
P
E
-
D
i
s
a
m
b
i
g
u
i
t
y
)
T
M
A
+
M
·
T
S
Y
M
⌋
wherein
L_LENGTH is the value of a LENGTH field of the L-SIG field,
m is 1 when the format of the PPDU is an HE Multi-User PPDU or HE Extended Range Single User PPDU format and m is 2 otherwise,
T PA is a preamble duration,
T SYM is a data symbol duration,
β is an integer number greater than or equal to zero,
b PE-Disambiguity is a Packet Extension (PE) Disambiguity bit value,
T MA is a mid-amble duration, and
M is a mid-amble periodicity.
15. The wireless device of claim 9 , wherein determining the number of mid-ambles N MA includes determining the number of mid-ambles N MA according to:
N
M
A
=
⌈
L_LENGTH
+
m
+
3
3
×
4
-
T
P
A
-
T
S
Y
M
(
1
+
β
+
b
P
E
-
Disambiguity
+
M
)
T
M
A
+
M
·
T
S
Y
M
⌉
wherein
L_LENGTH is the value of a LENGTH field of the L-SIG field,
m is 1 when the format of the PPDU is an HE Multi-User PPDU or HE Extended Range Single User PPDU format and m is 2 otherwise,
T PA is a preamble duration,
T SYM is a data symbol duration,
β is an integer number greater than or equal to zero,
b PE-Disambiguity is a Packet Extension (PE) Disambiguity bit value,
T MA is a mid-amble duration, and
M is a mid-amble periodicity.
16. The wireless device of any one of claim 9 , wherein receiving the data field comprises:
repeating, a number of times equal to the number of mid-ambles N MA :
receiving a plurality of consecutive data symbols, wherein the number of data symbols in the plurality of data symbols is equal to a mid-amble periodicity M, and
receiving a mid-amble immediately following the plurality of consecutive data symbols; and
receiving a remaining 0 or more remaining consecutive data symbols, wherein the number of remaining consecutive data symbols Nremain is equal to:
N remain= N SYM −( M·N MA ).
17. A non-transient computer-readable media (CRM) storing instructions which, when executed by a wireless device, cause the wireless device to perform steps comprising:
receiving a first portion of a PHY Protocol Data Unit (PPDU), the first portion including a Legacy Signal (L-SIG) field;
decoding the L-SIG field;
determining a format of the PPDU using the first portion; and
in response to determining that the format of the PPDU is a High Efficiency (HE) format:
receiving and decoding an HE Signal A (HE-SIG-A) field,
determining, using a Doppler field of the HE-SIG-A field, whether the PPDU includes mid-ambles, and
in response to determining that the PPDU includes mid-ambles:
determining, according to the format of the PPDU and using first information determined using the HE-SIG-A field and second information determined using the L-SIG field, a number of mid-ambles N MA indicating the number of mid-ambles included in a data field of the PPDU,
wherein the number of mid-ambles N MA is determined without using a number of data symbols N SYM included in the data field of the PPDU;
determining, using the number of the mid-ambles N MA , the number of data symbols N SYM included in the data field of the PPDU; and
receiving, using the number of mid-ambles N MA and the number of data symbols N SYM , the data field of the PPDU.
18. The non-transient CRM of claim 17 , wherein the first information includes a Packet Extension (PE) Disambiguity bit value b PE-Disambiguity , a number of HE Long Training Fields (HE-LTFs) value N HE-LTF , an HE-LTF duration including guard interval T HE-LTF , and a mid-amble periodicity M.
19. The non-transient CRM of claim 18 , wherein the first information further includes a preamble duration T PA according to the format of the PPDU.
20. The non-transient CRM of claim 18 , wherein the first information further includes a mid-amble duration T MA .
21. The non-transient CRM of claim 17 , wherein the second information includes a Length field value L_LENGTH.
22. The non-transient CRM of claim 17 , wherein determining the number of mid-ambles N MA includes determining the number of mid-ambles N MA according to:
N
M
A
=
⌊
L_LENGTH
+
m
+
3
3
×
4
-
T
P
A
-
T
S
Y
M
(
1
+
β
+
b
P
E
-
D
i
s
a
m
b
iguity
)
T
M
A
+
M
·
T
S
Y
M
⌋
wherein
L_LENGTH is the value of a LENGTH field of the L-SIG field,
m is 1 when the format of the PPDU is an HE Multi-User PPDU or HE Extended Range Single User PPDU format and m is 2 otherwise,
T PA is a preamble duration,
T SYM is a data symbol duration,
β is an integer number greater than or equal to zero,
b PE-Disambiguity is a Packet Extension (PE) Disambiguity bit value,
T MA is a mid-amble duration, and
M is a mid-amble periodicity.
23. The non-transient CRM of claim 17 , wherein determining the number of mid-ambles N MA includes determining the number of mid-ambles N MA according to:
N
M
A
=
⌈
L_LENGTH
+
m
+
3
3
×
4
-
T
P
A
-
T
S
Y
M
(
1
+
β
+
b
P
E
-
D
i
s
a
m
b
i
g
u
i
t
y
+
M
)
T
M
A
+
M
·
T
S
Y
M
⌉
wherein
L_LENGTH is the value of a LENGTH field of the L-SIG field,
m is 1 when the format of the PPDU is an HE Multi-User PPDU or HE Extended Range Single User PPDU format and m is 2 otherwise,
T PA is a preamble duration,
T SYM is a data symbol duration,
β is an integer number greater than or equal to zero,
b PE-Disambiguity is a Packet Extension (PE) Disambiguity bit value,
T MA is a mid-amble duration, and
M is a mid-amble periodicity.
24. The non-transient CRM of claim 17 , wherein receiving the data field comprises:
repeating, a number of times equal to the number of mid-ambles N MA :
receiving a plurality of consecutive data symbols, wherein the number of data symbols in the plurality of data symbols is equal to a mid-amble periodicity M, and
receiving a mid-amble immediately following the plurality of consecutive data symbols; and
receiving a remaining 0 or more remaining consecutive data symbols, wherein the number of remaining consecutive data symbols Nremain is equal to:
N remain= N SYM −( M·N MA ).