Apparatus and method of wireless communication
View Patent ↗An apparatus and a method of wireless communication are provided. The method by a user equipment (UE) includes performing, by the UE, a channel access procedure using an energy detection threshold (EDT) for a transmission, wherein the EDT is obtained from at least one of the followings: an initial value, a bandwidth (BW) scaling factor, a first offset, or a second offset. This can solve issues in the prior art, reduce signaling overhead, provide an energy detection threshold (ED threshold or EDT) calculation, provide a good communication performance, and/or provide high reliability.
1 . A wireless communication method, by a user equipment (UE), comprising:
performing, by the UE, a channel access procedure using an energy detection threshold (EDT) for a transmission, wherein the EDT is obtained from at least one of the followings: an initial value, a bandwidth (BW) scaling factor, a first offset, or a second offset,
wherein the initial value is relevant to at least one of the followings: a power spectrum density (PSD) or a BW,
wherein the initial value is obtained by 10*log 10 (PSD*BW), where the PSD comprises a PSD value in mW/MHz and the BW comprises a listen before talk (LBT) BW or channel access BW or nominal channel BW in MHz, and wherein at least one of the following applies: the PSD value is pre-defined or pre-configured, or the BW is pre-configured or pre-defined.
2 . The method of claim 1 , wherein at least one of the following applies: the UE is indicated by a base station to perform the transmission, or,
the UL channel access procedure comprises a type 2A channel access procedure, a type 2B channel access procedure, or a type 2C channel access procedure.
3 . The method of claim 1 , wherein the initial value is in dBm, the initial value being pre-configured or pre-defined, and wherein the initial value is set to a first value or the initial value is set to a first value plus or minus a backoff value.
4 . The method of claim 3 , wherein the first value is equal to −47 dBm and the backoff value is in dB.
5 . A wireless communication method, by a base station, comprising:
performing, by the base station, a channel access procedure using an energy detection threshold (EDT) for a transmission, wherein the EDT is obtained from at least one of the followings:
an initial value, a bandwidth (BW) scaling factor, a first offset, or a second offset,
wherein the initial value is relevant to at least one of the followings: a power spectrum density (PSD) or a BW,
wherein the initial value is obtained by 10*log 10 (PSD*BW), where the PSD comprises a PSD value in mW/MHz and the BW comprises a listen before talk (LBT) BW or channel access BW or nominal channel BW in MHz, and wherein at least one of the following applies: the PSD value is pre-defined or pre-configured, or the BW is pre-configured or pre-defined.
6 . The method of claim 5 , wherein the BW scaling factor is in dB, and the BW scaling factor is relevant to a first BW and a second BW.
7 . The method of claim 6 , wherein the first BW is a BW of a channel in which the UE performs channel access, a carrier BW, or a BW of a transmission that the UE performs in the channel,
wherein the first BW is configured by the base station or configured in at least one of the followings: a system information, a radio resource control (RRC) message, a medium access control (MAC) control element (CE), or a downlink control information (DCI), and
wherein the first BW is a pre-defined BW.
8 . The method of claim 6 , wherein at least one of the following applies: the second BW is an LBT BW or a nominal channel BW, or the second BW is configured by the base station or reported by the UE.
9 . The method of claim 8 , wherein at least one of the following applies: the base station is configured to receive one or more BWs from the UE, and the base station is configured to configure one BW as the second BW among the reported one or more BWs from the UE; or,
the base station is configured to receive a maximum BW from the UE, and the base station is configured to configure a BW smaller or equal to the reported maximum BW.
10 . The method of claim 6 , wherein the second BW is configured by the base station or configured in at least one of the followings: a system information, a radio resource control (RRC) message, a medium access control (MAC) control element (CE), or a downlink control information (DCI).
11 . The method of claim 10 , wherein the BW scaling factor is equal to
1
0
*
log
1
0
(
B
W
1
B
W
2
)
,
where BW1 is the first BW, and BW2 is the second BW.
12 . A user equipment (UE), comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver;
wherein the processor is configured to perform a channel access procedure using an energy detection threshold (EDT) for the transmission, wherein the EDT is obtained from at least one of the followings: an initial value, a bandwidth (BW) scaling factor, a first offset, or a second offset,
wherein the initial value is relevant to at least one of the followings: a power spectrum density (PSD) or a BW,
wherein the initial value is obtained by 10*log 10 (PSD*BW), where the PSD comprises a PSD value in mW/MHz and the BW comprises a listen before talk (LBT) BW or channel access BW or nominal channel BW in MHz, and wherein at least one of the following applies: the PSD value is pre-defined or pre-configured, or the BW is pre-configured or pre-defined.
13 . The UE of claim 12 , wherein the first offset is a transmit power offset of the UE or a transmit power offset of the base station, the first offset is in dB, and the first offset is obtained from P1 and/or P2, where P1 is a pre-defined power value in dBm and P2 is a maximum transmit power or output power at the base station in dBm for a channel or P2 is a maximum pre-configured or pre-defined transmit power for the UE in dBm.
14 . The UE of claim 12 , wherein the second offset is obtained from G1 and/or G2, where G1 is a first processing gain and G2 is a second processing gain,
wherein the second offset is obtained from a difference between G1 and G2 G1 is in dBi and a value of G1 is pre-configured or pre-defined, and G2 is in dBi and a value of G2 is relevant to a beamforming gain at the base station or the UE.
15 . The UE of claim 14 , wherein
E
D
T
=
X
-
A
+
G
1
-
G
2
+
P
1
-
P
2
+
1
0
*
log
1
0
(
B
W
1
B
W
2
)
,
where X is the first value in dBm and A is the backoff value in dB, X-A is the initial value,
wherein the backoff value has the following relationship: A=max(G1−G2)+max(P1−P2), where max(G1−G2) is the maximum difference between G1 and G2, and max(P1−P2) is the maximum difference between P1 and P2, and
wherein the EDT is limited by a maximum value and/or a minimum value, and
Min
value
=
X
-
A
+
1
0
*
log
1
0
(
B
W
1
B
W
2
)
.
16 . A base station, comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver;
wherein the processor is configured to perform a channel access procedure using an energy detection threshold (EDT) for a transmission, wherein the EDT is obtained from at least one of the followings: an initial value, a bandwidth (BW) scaling factor, a first offset, or a second offset,
wherein the initial value is relevant to at least one of the followings: a power spectrum density (PSD) or a BW,
wherein the initial value is obtained by 10*log 10 (PSD*BW), where the PSD comprises a PSD value in mW/MHz and the BW comprises a listen before talk (LBT) BW or channel access BW or nominal channel BW in MHz, and wherein at least one of the following applies: the PSD value is pre-defined or pre-configured, or the BW is pre-configured or pre-defined.
17 . The base station of claim 16 , wherein a user equipment (UE) supports different BW values,
wherein the BW values are relevant to a subcarrier spacing (SCS), and
wherein the SCS comprises at least one of the followings: 120 kHz, 240 kHz, 480 kHz, or 960 kHz.
18 . The base station of claim 17 , wherein when the UE supports a given BW for a given SCS value, the UE is configured with a maximum number of resource blocks (RBs) in a BWP.
19 . The base station of claim 18 , wherein when the given SCS value is 120 kHz, the given BW is 50 MHz, the maximum number of RBs is 32, or when the given SCS value is 120 kHz, the given BW is 100 MHz, the maximum number of RBs is 66, or when the given SCS value is 120 kHz, the given BW is 200 MHz, the maximum number of RBs is 132, or when the given SCS value is 120 kHz, the given BW is 400 MHz, the maximum number of RBs is 264;
when the given SCS value is 240 kHz, the given BW is 100 MHz, the maximum number of RBs is 33, or when the given SCS value is 240 kHz, the given BW is 200 MHz, the maximum number of RBs is 66, or when the given SCS value is 240 kHz, the given BW is 800 MHz, the maximum number of RBs is 264, or when the given SCS value is 480 kHz, the given BW is 200 MHz, the maximum number of RBs is 33;
when the given SCS value is 480 kHz, the given BW is 400 MHz, the maximum number of RBs is 66, or when the given SCS value is 480 kHz, the given BW is 800 MHz, the maximum number of RBs is 132 or 133, or when the given SCS value is 480 kHz, the given BW is 1600 MHz, the maximum number of RBs is 264, 265, or 266; and
when the given SCS value is 960 kHz, the given BW is 400 MHz, the maximum number of RBs is 33, or when the given SCS value is 960 kHz, the given BW is 800 MHz, the maximum number of RBs is 66, or when the given SCS value is 960 kHz, the given BW is 1600 MHz, the maximum number of RBs is 132, or when the given SCS value is 960 kHz, the given BW is 2.16 GHz, the maximum number of RBs is 178.