Data transmission method and terminal device thereof
A data transmission method includes obtaining, by user equipment (UE), a maximum transmit power; determining, by the UE, a transmit power of a data channel and/or a transmit power of a control channel based on the maximum transmit power and a first parameter, where the first parameter includes at least one of the following: a bandwidth of the data channel, a bandwidth of the control channel, or a carrier type of a carrier of a first link; and sending, by the UE, the control channel and the data channel in a same subframe.
1. A data transmission method performed in an apparatus, comprising:
determining a first parameter A , wherein A equals to
10
log
10
(
M
PSSCH
+
10
a
10
×
M
PSCCH
)
+
P
O_PSSCH
+
α
PSSCH
·
PL
,
wherein M PSCCH indicates a bandwidth of a control channel and M PSSCH indicates a bandwidth of a data channel, PL indicates a value of a path loss between the apparatus and a base station, a PSSCH is configured by the base station, P O_PSSCH is configured by the base station or a predefined value, and a is a predefined constant;
in case of A≤P CMAX , determining a transmit power P PSSCH of a data channel, wherein P CMAX indicates a maximum transmit power, and
P PSSCH equals to
10 log 10 ( M PSSCH )+ P O_PSSCH +α PSSCH ·PL [dBm]; or
in case of A>P CMAX , determining the transmit power P PSSCH of the data channel based on a sum of a first additional item and P CMAX , wherein the first additional item is determined based on M PSSCH and M PSSCH ; and
sending the control channel and the data channel in a same subframe.
2. The method according to claim 1 , a equals to −3, 0, or 3.
3. The method according to claim 1 , wherein in case of A>P CMAX , the first additional item equals to:
10
log
10
(
M
PSSCH
c
·
M
PSCCH
+
M
PSSCH
)
,
wherein c is a predefined constant, and P PSSCH equals to
10
log
10
(
M
PSSCH
cM
PSCCH
+
M
PSSCH
)
+
P
CMAX
[
dBm
]
.
4. The method according to claim 1 , further comprising:
in case of A≤P CMAX , determining a transmit power P PSCCH of the control channel, wherein
P PSCCH equals to
10
log
10
(
10
a
10
M
PSCCH
)
+
P
O
_
PSSCH
+
α
PSSCH
·
PL
[
dBm
]
;
or
in case of A>P CMAX , determining the transmit power P PSCCH of the control channel based on a sum of a second additional item and P CMAX , wherein the second additional item is determined based on M PSSCH and M PSSCH .
5. The method according to claim 4 , wherein in case of A>P CMAX , the second additional item equals to:
10
log
10
(
c
·
M
PSCCH
cM
PSCCH
+
M
PSSCH
)
,
wherein c is a predefined constant, and P PSCCH equals to
10
log
10
(
c
·
M
PSCCH
cM
PSCCH
+
M
PSSCH
)
+
P
CMAX
[
dBm
]
.
6. The method according to claim 1 , wherein the control channel is a physical sidelink control channel (PSCCH) and the data channel is a physical sidelink shared channel (PSSCH).
7. The method according to claim 1 , wherein the maximum transmit power P CMAX is a maximum transmit power value configured by the base station or a predefined maximum transmit power value.
8. An apparatus, comprising:
at least one processor; and
a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions instruct the at least one processor to:
determine a first parameter A, wherein A equals to
10
log
10
(
M
PSSCH
+
10
a
10
×
M
PSCCH
)
+
P
O_PSSCH
+
α
PSSCH
·
PL
,
wherein M PSCCH indicates a bandwidth of a control channel and M PSSCH indicates a bandwidth of a data channel, PL. indicates a value of a path loss between the apparatus and a base station, α PSSCH is configured by the base station, P O_PSSCH is configured by the base station or a predefined value, and a is a predefined constant;
in case of A≤P CMAX , determine a transmit power P PSSCH of a data channel, wherein P CMAX indicates a maximum transmit power, and
P PSSCH equals to
10 log 10 ( M PSSCH )− P O_PSSCH +α PSSCH ·PL [dBm]; or
in case of A>P CMAX , determine the transmit power P PSSCH of the data channel based on a sum of a first additional item and P CMAX , wherein the first additional item is determined based on M PSSCH and M PSSCH ; and
cause a transceiver to send the control channel and the data channel in a same subframe.
9. The apparatus according to claim 8 , a equals to −3, 0, or 3.
10. The apparatus according to claim 8 , wherein the programming instructions instruct the at least one processor to:
in case of A>P CMAX , use the first additional item that equals to:
10
log
10
(
M
PSSCH
c
·
M
PSCCH
+
M
PSSCH
)
,
wherein c is a predefined constant, and P PSSCH equals to
10
log
10
(
M
PSSCH
cM
PSCCH
+
M
PSSCH
)
+
P
CMAX
[
dBm
]
.
11. The apparatus according to claim 8 , wherein the programming instructions instruct the at least one processor to:
in case of A≤P CMAX , determine a transmit power P PSCCH of the control channel, wherein P PSCCH equals to
10
log
1
0
(
1
0
a
1
0
M
P
S
C
C
H
)
+
P
O
_
P
S
S
C
H
+
α
P
S
S
C
H
·
P
L
[
d
B
m
]
;
or
in case of A>P CMAX , determine the transmit power P PSCCH of the control channel based on a sum of a second additional item and P CMAX , wherein the second additional item is determined based on M PSSCH and M PSSCH .
12. The apparatus according to claim 11 , wherein in case of A>P CMAX , the second additional item equals to:
10
log
10
(
c
·
M
PSCCH
cM
PSCCH
+
M
PSSCH
)
,
wherein c is a predefined constant, and P PSCCH equals to
10
log
10
(
c
·
M
PSCCH
cM
PSCCH
+
M
PSSCH
)
+
P
CMAX
[
dBm
]
.
13. The apparatus according to claim 8 , wherein the control channel is a physical sidelink control channel (PSCCH) and the data channel is a physical sidelink shared channel (PSSCH).
14. The apparatus according to claim 1 , wherein the maximum transmit power P CMAX is a maximum transmit power value configured by the base station or a predefined maximum transmit power value.
15. The apparatus according to claim 8 , wherein the apparatus comprises a terminal device.
16. A non-transitory computer readable storage medium, comprising computer program codes which when executed by at least one processor cause a terminal device to perform steps of:
determining a first parameter A , wherein A equals to
10
log
10
(
M
PSSCH
+
10
a
10
×
M
PSCCH
)
+
P
O_PSSCH
+
α
PSSCH
·
PL
,
wherein M PSCCH indicates a bandwidth of a control channel and M PSSCH indicates the bandwidth of a data channel, PL indicates a value of a path loss between the terminal device and a base station, α PSSCH is configured by the base station 1 , P O_PSSCH is configured by the base station or a predefined value, and a is a predefined constant,
in case of A≤P CMAX , determining a transmit power P PSSCH of a data channel, wherein P CMAX indicates a maximum transmit power,
P PSSCH equals to
10 log 10 ( M PSSCH )−P O_PSSCH +α PSSCH ·PL [dBm]; or
in case of A>P CMAX , determining the transmit power P PSSCH of the data channel based on a sum of a first additional item and P CMAX wherein the first additional item is determined based on M PSSCH and M PSSCH ; and
sending the control channel and the data channel in a same suhframe.
17. The non-transitory computer readable storage medium according to claim 16 , a equals to −3, 0, or 3.
18. The non-transitory computer readable storage medium according to claim 16 , wherein in case of A>P CMAX , the first additional item equals to:
10
log
10
(
M
PSSCH
c
·
M
PSCCH
+
M
PSSCH
)
,
wherein c is a predefined constant, and P PSSCH equals to
10
log
10
(
M
PSSCH
cM
PSCCH
+
M
PSSCH
)
+
P
CMAX
[
dBm
]
.
19. The non-transitory computer readable storage medium according to claim 16 , wherein the steps further comprise:
in case of A≤P CMAX , determining transmit power P PSCCH of the control channel, wherein
P PSCCH equals to
10
log
1
0
(
1
0
a
1
0
M
P
S
C
C
H
)
+
P
O
_
P
S
S
C
H
+
α
P
S
S
C
H
·
P
L
[
d
B
m
]
;
or
in case of A>P CMAX , determining the transmit power P PSCCH , of the control channel based on a sum of a second additional item and P CMAX , wherein the second additional item is determined based on and M PSSCH and M PSSCH .
20. The non-transitory computer readable storage medium according to claim 19 , wherein in case of A>P CMAX , the second additional item equals to:
10
log
10
(
c
·
M
PSCCH
cM
PSCCH
+
M
PSSCH
)
,
wherein c is a predefined constant, and P PSCCH equals to
10
log
10
(
c
·
M
PSCCH
cM
PSCCH
+
M
PSSCH
)
+
P
CMAX
[
dBm
]
.