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 a total number of mid-ambles included in a data field of the PPDU;
determining, using the number of the mid-ambles N MA , a number of data symbols N SYM indicating a total number of data symbols 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 data symbol duration T SYM , 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, the HE-LTF duration T HE-LTF , and the number of HE-LTFs value N HE-LTF .
4. The method of claim 3 , wherein the first information further includes a mid-amble duration T MA .
5. The method of claim 4 , wherein the second information includes a Length field value L_LENGTH.
6. The method of claim 5 , 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 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, and
wherein β is an integer number greater than or equal to zero.
7. The method of claim 6 , wherein β is 1.
8. The method of claim 5 , 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 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, and
wherein β is an integer number greater than or equal to zero.
9. The method of claim 8 , wherein β is 1.
10. 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 the 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 data symbols N remain is equal to:
N remain =N SYM −( M·N MA ).
11. 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 a total number of mid-ambles included in a data field of the PPDU;
determining, using the number of the mid-ambles N MA , a number of data symbols N SYM indicating a total number of data symbols 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.
12. The wireless device of claim 11 , 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 data symbol duration T SYM , and a mid-amble periodicity M.
13. The wireless device of claim 12 , wherein the first information further includes a preamble duration T PA according to the format of the PPDU, the HE-LTF duration T HE-LTF , and the number of HE-LTFs value N HE-LTF .
14. The wireless device of claim 13 , wherein the first information further includes a mid-amble duration T MA .
15. The wireless device of claim 14 , wherein the second information includes a Length field value L_LENGTH.
16. The wireless device of claim 15 , 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 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, and
wherein β is an integer number greater than or equal to zero.
17. The wireless device of claim 16 , wherein β is 1.
18. The wireless device of claim 15 , 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 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, and
wherein β is an integer number greater than or equal to zero.
19. The wireless device of claim 18 , wherein β is 1.
20. The wireless device of claim 11 , 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 the 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 data symbols N remain is equal to:
N remain =N SYM −( M·N MA ).