Method for transmitting/receiving uplink signal and device supporting same in wireless communication system supporting unlicensed band
Disclosed are a method for transmitting/receiving an uplink signal between a terminal and a base station and a device supporting same in a licensed assisted access (LAA) system in which the base station or the terminal executes listen-before-talk (LBT)-based signal transmission. Specifically, disclosed are: a method for a terminal transmitting an uplink signal by executing an uplink LBT operation which is based on LBT-related information if the base station provides the LBT-related information for the uplink LBT operation of the terminal; and a device supporting same.
1. A method of transmitting an uplink signal by a user equipment (UE) to a base station in a wireless communication system supporting an unlicensed band, the method comprising:
receiving from the base station, information indicating an energy detection threshold for an uplink transmission in the unlicensed band,
wherein the information indicates one of:
a first equation for a case where the unlicensed band is not shared with a different communication technology, or
a second equation for a case where the unlicensed band is shared with the different communication technology;
determining an actual energy detection threshold value for the uplink transmission using the first equation or the second equation based on the information; and
transmitting the uplink signal based on a channel access procedure (CAP) for the uplink transmission in the unlicensed band, based on the determined actual energy detection threshold value,
wherein the actual energy detection threshold value is determined based on a first maximum energy detection threshold value satisfying the first equation based on that the information indicates the first equation, and
wherein the actual energy detection threshold value is determined based on a second maximum energy detection threshold value satisfying the second equation based on that the information indicates the second equation,
wherein the first equation is determined based on a following equation,
X
Thresh
_
max
=
min
{
T
max
+
10
dB
,
X
r
}
[
Equation
]
where X Thresh_max denotes the first maximum energy detection threshold value, T max denotes a reference energy detection threshold value related to a bandwidth, and X r , denotes a maximum energy detection threshold defined by regulatory requirements, and
wherein the second equation is determined based on a following equation,
X
Thresh
_
max
=
max
{
-
72
dBm
(
20
MHz
)
,
min
{
T
max
.
T
max
-
T
A
+
(
P
H
-
P
TX
)
}
}
[
Equation
]
where X Thresh_max denotes the second maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, T A denotes a weight for an energy detection threshold value according to a physical channel, P H denotes a reference power value for the base station on the unlicensed band, and P TX corresponds to a configured maximum UE output power for the unlicensed band.
2. The method of claim 1 , wherein the different communication technology contains a Wi-Fi communication technology.
3. A method of receiving an uplink signal by a base station from a user equipment (UE) in a wireless communication system supporting an unlicensed hand, the method comprising;
transmitting to the UE, information indicating an energy detection threshold for an uplink transmission in the unlicensed band,
wherein the information indicates one of:
a first equation for a case where e unlicensed band is not shared with a different communication technology, or
a second equation for a case where the unlicensed band is shared with the different communication technology; and
receiving from the UE, the uplink signal transmitted based on the information via the unlicensed band,
wherein the first equation is determined based on a following equation,
X
Thresh
_
max
=
min
{
T
max
+
10
d
B
,
X
r
}
[
Equation
]
where X Thresh_max denotes a first maximum energy detection threshold value, T max denotes a reference energy detection threshold value related to a bandwidth, and X r denotes a maximum energy detection threshold defined by regulatory requirements, and
wherein the second equation is determined based on a following equation,
X
Thresh
_
max
=
max
{
-
72
dBm
(
20
MHz
)
,
min
{
T
max
.
T
max
-
T
A
+
(
P
H
-
P
TX
)
}
}
[
Equation
]
where X Thresh_max denotes a second maximum energy detection threshold value, T max , denotes the reference energy detection threshold value related to the bandwidth, T A denotes a weight for an energy detection threshold value according to a physical channel, P H denotes a reference power value for the base station on the unlicensed band, and P TX corresponds to a configured maximum UE output power for the unlicensed band.
4. The method of claim 3 , wherein the different communication technology contains a Wi-Fi communication technology.
5. A user equipment (UE) for transmitting an uplink signal to a base station in a wireless communication system supporting an unlicensed band, the UE comprising:
a receiver;
a transmitter; and
a processor operatively coupled with the receiver and the transmitter,
wherein the processor is configured to:
receive from the base station, information indicating an energy detection threshold for an uplink transmission in the unlicensed band,
wherein the information indicates one of:
a first equation for a case where the unlicensed band is not shared with a different communication technology, or
a second equation for a case where the unlicensed band is shared with the different communication technology;
determine an actual energy detection threshold value for the uplink transmission using the first equation or the second equation based on the information; and
transmit the uplink signal based on a channel access procedure (CAP) for the uplink transmission in the unlicensed band, based on the determined actual energy detection threshold value,
wherein the actual energy detection threshold value is determined based on a first maximum energy detection threshold value satisfying the first equation based on that the information indicates the first equation, and,
wherein the actual energy detection threshold value is determined based on a second maximum energy detection threshold value satisfying the second equation based on that the information indicates the second equation,
wherein the first equation is determined based on a following equation,
X
Thresh
_
max
=
min
{
T
max
+
10
d
B
,
X
r
}
[
Equation
]
where X Thresh_max denotes the first maximum energy detection threshold value, T max denotes a reference energy detection threshold value related to a bandwidth, and X r denotes a maximum energy detection threshold defined by regulatory requirements, and
wherein the second equation is determined based on a following equation,
X
Thresh
_
max
=
max
{
-
72
dBm
(
20
MHz
)
,
min
{
T
max
.
T
max
-
T
A
+
(
P
H
-
P
TX
)
}
}
[
Equation
]
where X Thresh_max denotes the second maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, T A denotes a weight for an energy detection threshold value according to a physical channel, P H denotes a reference power value for the base station on the unlicensed band, and P TX corresponds to a configured maximum output power for the unlicensed band.
6. A base station for receiving an uplink signal from a user equipment (UE) in a wireless communication system supporting an unlicensed band, the base station comprising:
a receiver;
a transmitter; and
a processor operatively coupled with the receiver and the transmitter,
wherein the processor is configured to:
transmit to the UE, information indicating an energy detection threshold for an uplink transmission in the unlicensed band,
wherein the information indicates one of:
a first equation for a case where the unlicensed band is not shared with a different communication technology, based on a determination that the unlicensed band is not shared with the different communication technology, or
a second equation for a case where the unlicensed band is shared with the different communication technology, based on a determination that the unlicensed band is shared with the different communication technology; and
receive from the UE, the uplink signal transmitted based on the information via the unlicensed band,
wherein the first equation is determined based on a following equation,
X
Thresh
_
max
=
min
{
T
max
+
10
d
B
,
X
r
}
[
Equation
]
where X Thresh_max denotes a first maximum energy detection threshold value, T max denotes a reference energy detection threshold value related to a bandwidth, and X r denotes a maximum energy detection threshold defined by regulatory requirements, and
wherein the second equation is determined based on a following equation,
X
Thresh
_
max
=
max
{
-
72
dBm
(
20
MHz
)
,
min
{
T
max
.
T
max
-
T
A
+
(
P
H
-
P
TX
)
}
}
[
Equation
]
where X Thresh_max denotes the a second maximum energy detection threshold value, T max denotes the reference energy detection threshold value related to the bandwidth, T A denotes a weight for an energy detection threshold value according to a physical channel, P H denotes a reference power value for the base station on the unlicensed band, and P TX corresponds to a configured maximum UE output power for the unlicensed band.