Wireless communication method and wireless communication terminal for coexistence with legacy wireless communication terminal
A wireless communication terminal for wireless communication is disclosed. The wireless communication terminal includes: a transceiver; and a processor. The processor is configured to transmit a non-legacy physical layer frame including a legacy signaling field including information decodable by a legacy wireless communication terminal by using the transceiver.
1. A wireless communication terminal that communicates wirelessly, the terminal comprising:
a transceiver; and
a processor,
wherein the processor is configured to receive a non-legacy physical layer frame by using the transceiver,
obtain a legacy signaling field including information decodable by a legacy wireless communication terminal from the non-legacy physical layer frame,
obtain length information indicating information on a duration of the non-legacy physical layer frame, from the legacy signaling field,
obtain information other than information on the duration of the non-legacy physical layer frame based on a modulation method of a third symbol after the legacy signaling field and a remaining value obtained by dividing the length information by a data size transmittable by a symbol of a legacy physical layer frame, wherein the information other than information on the duration of the non-legacy physical layer frame indicates a format of a non-legacy signaling field included in the non-legacy physical layer frame, and
determine the number of symbols of data of the non-legacy physical layer frame according to a following equation,
N
SYM
=
⌊
(
L_LENGTH
+
m
+
3
D
size
×
4
-
T
HE
_
PREAMBLE
)
/
T
SYM
⌋
-
b
PE
_
Disambiguity
where └x┘ denotes a largest integer less than or equal to x,
L_LENGTH denotes the length information,
m denotes a value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame,
D size denotes the data size transmittable by a symbol of the legacy physical layer frame,
b PE_Disambiguity denotes a value of PE Disambiguity field,
T HE_PREAMBLE denotes a duration of non-legacy preamble of the non-legacy physical layer frame,
T SYM denotes a duration of a symbol of the data of the non-legacy physical layer frame,
wherein the PE Disambiguity field is set based on the duration of a symbol of the data of the non-legacy physical layer frame and an increment of duration to set a value of the length information based on a duration of a symbol of the legacy physical layer frame.
2. The wireless communication terminal of claim 1 , wherein the processor is configured to obtain a duration of a packet extension which is a padding of the non-legacy physical layer frame, according to a following equation,
T
PE
=
⌊
(
L_LENGTH
+
m
+
3
D
size
×
4
-
T
HE
_
PREAMBLE
)
-
N
SYM
×
T
SYM
4
⌋
×
4
where └x┘ denotes a largest integer less than or equal to x,
L_LENGTH denotes the length information, m denotes the value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame,
D size denotes the data size transmittable by a symbol of the legacy physical layer frame,
T HE_PREAMBLE denotes the duration of non-legacy preamble of the non-legacy physical layer frame,
T SYM denotes the duration of a symbol of the data of the non-legacy physical layer frame.
3. The wireless communication terminal of claim 2 , wherein the data size transmittable by a symbol of the legacy physical layer frame is 3 octets when a data rate of the legacy physical layer frame is 6 Mbps.
4. The wireless communication terminal of claim 1 , wherein the increment of duration is a value obtained by multiplying a difference between a value obtained by performing a ceiling operation on a value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame and the value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame by the duration of a symbol of the legacy physical layer frame.
5. The wireless communication terminal of claim 1 , wherein the processor is configured to determine whether the non-legacy physical layer frame comprises a predetermined signaling field based on the information other than information on the duration of the non-legacy physical layer frame.
6. The wireless communication terminal of claim 1 , wherein the modulation method is Binary Phase Shift Keying (BPSK) or Quadrature Binary Phase Shift Keying (QBPSK).
7. An operation method of a wireless communication terminal that communicates wirelessly, the method comprising:
receiving a non-legacy physical layer frame by using the transceiver,
obtaining a legacy signaling field including information decodable by a legacy wireless communication terminal from the non-legacy physical layer frame,
obtaining length information indicating information on a duration of the non-legacy physical layer frame after a legacy signaling field, from the legacy signaling field,
obtaining information other than the information on the duration of the non-legacy physical layer frame based on a modulation method of a third symbol after the legacy signaling field and a remaining value obtained by dividing the length information by a data size transmittable by a symbol of a legacy physical layer frame, wherein the information other than information on the duration of the non-legacy physical layer frame indicates a format of a non-legacy signaling field included in the non-legacy physical layer frame, and
determining the number of symbols of the data of the non-legacy physical layer frame according to a following equation,
N
SYM
=
⌊
(
L_LENGTH
+
m
+
3
D
size
×
4
-
T
HE
_
PREAMBLE
)
/
T
SYM
⌋
-
b
PE
_
Disambiguity
where [x] denotes a largest integer less than or equal to x,
L_LENGTH denotes the length information,
m denotes a value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame,
D size denotes the data size transmittable by a symbol of the legacy physical layer frame,
b PE_Disambiguity denotes a value of PE Disambiguity field,
T HE_PREAMBLE denotes a duration of non-legacy preamble of the non-legacy physical layer frame,
T SYM denotes a duration of a symbol of the data of the non-legacy physical layer frame,
wherein the PE Disambiguity field is set based on the duration of a symbol of the data of the non-legacy physical layer frame and an increment of duration to set a value of the length information based on a duration of a symbol of legacy physical layer frame.
8. The method of claim 7 , the method further comprises obtaining a duration of a packet extension which is a padding of the non-legacy physical layer frame, according to a following equation,
T
PE
=
⌊
(
L_LENGTH
+
m
+
3
D
size
×
4
-
T
HE
_
PREAMBLE
)
-
N
SYM
×
T
SYM
4
⌋
×
4
where [x] denotes a largest integer less than or equal to x,
L_LENGTH denotes the length information,
m denotes the value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame,
D size denotes the data size transmittable by a symbol of the legacy physical layer frame,
T HE_PREAMBLE denotes the duration of non-legacy preamble of the non-legacy physical layer frame,
T SYM denotes the duration of a symbol of the data of the non-legacy physical layer frame.
9. The method of claim 8 , wherein the data size transmittable by a symbol of the legacy physical layer frame is 3 octets when a data rate of the legacy physical layer frame is 6 Mbps.
10. The method of claim 7 , wherein the increment of duration is a value obtained by multiplying a difference between a value obtained by performing a ceiling operation on a value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame and the value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame by the duration of a symbol of the legacy physical layer frame.
11. The method of claim 7 , the method further comprises
determining whether the non-legacy physical layer frame comprises a predetermined signaling field based on the information other than information on the duration of the non-legacy physical layer frame.
12. The method of claim 7 , wherein the modulation method is Binary Phase Shift Keying (BPSK) or Quadrature Binary Phase Shift Keying (QBPSK).