Determining the number of symbols in a data field of a frame based on aggregation
A method for determining a number of symbols in a data field of a physical layer (PHY) protocol data unit (PPDU) is described. The method includes determining, by a wireless transmitting device, whether aggregation is to be applied to the PPDU; determining, by the wireless transmitting device, whether a PSDU length indication of the data field for the PPDU is greater than zero; selecting, by the wireless transmitting device, a first value in response to determining that (1) aggregation is not to be applied to the PPDU and (2) the PSDU length indication for the PPDU is greater than zero; and calculating, by the wireless transmitting device, the number of symbols in the data field of the PPDU based on the first value, wherein the first value is the PSDU length indication, wherein the first value is provided in a transmission vector (TXVECTOR).
1. A method for determining a number of symbols in a data field of a physical layer (PHY) protocol data unit (PPDU), the method comprising:
determining, by a wireless transmitting device, whether aggregation is to be applied to the PPDU;
determining, by the wireless transmitting device, whether a physical layer (PHY) service data unit (PSDU) length indication of the data field for the PPDU is greater than zero;
selecting, by the wireless transmitting device, a first value in response to determining that (1) aggregation is not to be applied to the PPDU and (2) the PSDU length indication for the PPDU is greater than zero; and
calculating, by the wireless transmitting device, the number of symbols in the data field of the PPDU based on the first value,
wherein the first value is the PSDU length indication,
wherein when low-density parity-check (LDPC) coding is used for the PPDU, the wireless transmitting device calculates the number of symbols in the data field of the PPDU as:
m
S
T
B
C
×
⌈
8
·
PSDU_LENGTH
+
N
s
e
r
v
i
c
e
m
S
T
B
C
·
N
D
B
P
S
⌉
,
wherein the PSDU_LENGTH is the first value, m STBC is equal to 2 when space-time block coding (STBC) is used for the PPDU and is otherwise set to 1, N DBPS indicates the number of data bits in Orthogonal Frequency Division Multiplexing (OFDM) symbols in the PPDU, and N service indicates the number of service bits, and
wherein the first value is provided in a transmission vector (TXVECTOR) and the TXVECTOR also includes a second value, wherein the second value is a length for an aggregated media access control (MAC) protocol data unit (A-MPDU) of the PPDU.
2. The method of claim 1 , further comprising:
selecting, by the wireless transmitting device, the second value in response to determining that aggregation is to be applied to the PPDU; and
calculating, by the wireless transmitting device, the number of symbols in the data field of the PPDU based on the second value.
3. The method of claim 2 , wherein the second value is the length of the A-MPDU for the PPDU pre-end of frame padding.
4. The method of claim 3 , wherein when binary convolution coding (BCC) is used for the PPDU, the wireless transmitting device calculates the number of symbols in the data field of the PPDU as:
m
S
T
B
C
×
⌈
8
·
APEP_LENGTH
+
N
service
+
N
tail
·
N
ES
m
S
T
B
C
·
N
D
B
P
S
⌉
,
wherein APEP_LENGTH is the second value, m STBC is equal to 2 when space-time block coding (STBC) is used for the PPDU and is otherwise set to 1, N ES indicates the number of BCC encoders used for the PPDU, N DBPS indicates the number of data bits in Orthogonal Frequency Division Multiplexing (OFDM) symbols in the PPDU, N service indicates the number of service bits, and N tail indicates the number of tail bits used for encoding data of the data field.
5. The method of claim 3 , wherein when low-density parity-check (LDPC) coding is used for the PPDU, the wireless transmitting device calculates the number of symbols in the data field of the PPDU as
m
S
T
B
C
×
⌈
8
·
APEP_LENGTH
+
N
s
e
r
v
i
c
e
m
S
T
B
C
·
N
D
B
P
S
⌉
,
wherein APEP_LENGTH is the second value, m STBC is equal to 2 when space-time block coding (STBC) is used for the PPDU and is otherwise set to 1, N DBPS indicates the number of data bits in Orthogonal Frequency Division Multiplexing (OFDM) symbols in the PPDU, and N service indicates the number of service bits.
6. The method of claim 2 , wherein an indication of whether aggregation is to be applied to the PPDU is provided in the TXVECTOR used by the wireless transmitting device for generating the PPDU, and
wherein the TXVECTOR is passed from a MAC layer of the wireless transmitting device to a PHY layer of the wireless transmitting device.
7. The method of claim 1 , wherein an indication of whether aggregation is to be applied to the PPDU is provided in the TXVECTOR that is used by the wireless transmitting device for generating the PPDU, and
wherein the TXVECTOR is passed from a MAC layer of the wireless transmitting device to a PHY layer of the transmitting device.
8. The method of claim 1 , further comprising:
generating, by the wireless transmitting device, the PPDU including a preamble portion and the PSDU,
wherein the preamble portion includes an indication that aggregation was applied to the PPDU.
9. The method of claim 1 , wherein the first value is provided in the TXVECTOR as PSDU_LENGTH and the second value is provided in the TXVECTOR as APEP_LENGTH.
10. A method for determining a number of symbols in a data field of a physical layer (PHY) protocol data unit (PPDU), the method comprising:
determining, by a wireless receiving device, whether aggregation was applied to the PPDU;
determining, by the wireless receiving device, whether a physical layer (PHY) service data unit (PSDU) length indication of the data field for the PPDU is greater than zero;
selecting, by the wireless receiving device, a first value in response to determining that (1) aggregation was not applied to the PPDU and (2) the PSDU length indication for the PPDU is greater than zero; and
calculating, by the wireless receiving device, the number of symbols in the data field of the PPDU based on the first value,
wherein the first value is the PSDU length indication,
wherein when low-density parity-check (LDPC) coding is used for the PPDU, the wireless receiving device calculates the number of symbols in the data field of the PPDU as:
m
S
T
B
C
×
⌈
8
·
PSDU_LENGTH
+
N
s
e
r
v
i
c
e
m
S
T
B
C
·
N
D
B
P
S
⌉
,
wherein the PSDU_LENGTH is the first value, m STBC is equal to 2 when space-time block coding (STBC) is used for the PPDU and is otherwise set to 1, N DBPS indicates the number of data bits in Orthogonal Frequency Division Multiplexing (OFDM) symbols in the PPDU, and N service indicates the number of service bits, and
wherein the first value is provided in a receiving vector (RXVECTOR) and the RXVECTOR also includes a second value, wherein the second value is a length for an aggregated media access control (MAC) protocol data unit (A-MPDU) of the PPDU.
11. The method of claim 10 , further comprising:
selecting, by the wireless receiving device, the second value in response to determining that aggregation was applied to the PPDU; and
calculating, by the wireless receiving device, the number of symbols in the data field of the PPDU based on the second value.
12. The method of claim 11 , wherein the second value is the length of the A-MPDU for the PPDU pre-end of frame padding.
13. The method of claim 12 , wherein when binary convolution coding (BCC) was used for the PPDU, the wireless receiving device calculates the number of symbols in the data field of the PPDU as:
m
S
T
B
C
×
⌈
8
·
APEP_LENGTH
+
N
service
+
N
tail
·
N
ES
m
S
T
B
C
·
N
D
B
P
S
⌉
,
wherein APEP_LENGTH is the second value, m STBC is equal to 2 when space-time block coding (STBC) was used for the PPDU and is otherwise set to 1, N ES indicates the number of BCC encoders used for the PPDU, N DBPS indicates the number of data bits in Orthogonal Frequency Division Multiplexing (OFDM) symbols in the PPDU, N service indicates the number of service bits, and N tail indicates the number of tail bits used for encoding data of the data field.
14. The method of claim 12 , wherein when low-density parity-check (LDPC) coding was used for the PPDU, the wireless receiving device calculates the number of symbols in the data field of the PPDU as:
m
S
T
B
C
×
⌈
8
·
APEP_LENGTH
+
N
s
e
r
v
i
c
e
m
S
T
B
C
·
N
D
B
P
S
⌉
,
wherein APEP_LENGTH is the second value, m STBC is equal to 2 when space-time block coding (STBC) was used for the PPDU and is otherwise set to 1, N DBPS indicates the number of data bits in Orthogonal Frequency Division Multiplexing (OFDM) symbols in the PPDU, and N service indicates the number of service bits.
15. The method of claim 11 , wherein an indication of whether aggregation was applied to the PPDU is provided in the RXVECTOR, and
wherein the RXVECTOR is passed from a PHY layer of the wireless receiving device to a MAC layer of the wireless receiving device.
16. The method of claim 10 , wherein an indication of whether aggregation was applied to the PPDU is provided in the RXVECTOR, and
wherein the RXVECTOR is passed from a PHY layer of the wireless receiving device to a MAC layer of the wireless receiving device.
17. The method of claim 10 , further comprising:
processing, by the wireless receiving device, the PPDU including a preamble portion and the PSDU,
wherein the preamble portion includes an indication that aggregation was applied to the PPDU.
18. The method of claim 17 , wherein the first value is provided in the RXVECTOR as PSDU_LENGTH and the second value is provided in the RXVECTOR as APEP_LENGTH.