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, comprising:
obtaining, by an apparatus, a maximum transmit power;
determining, by the apparatus, a transmit power of a data channel based on a sum of the maximum transmit power and a first additional item, wherein the first additional item is determined based on a bandwidth of a control channel and a bandwidth of the data channel;
determining, by the apparatus, a transmit power of a control channel based on a sum of the maximum transmit power and a second additional item, wherein the second additional item is determined based on the bandwidth of the control channel and the bandwidth of the data channel; and
sending, by the apparatus, the control channel and the data channel in a same subframe.
2. The method according to claim 1 , wherein the maximum transmit power is a maximum transmit power value configured by a base station or a predefined maximum transmit power value.
3. The method according to claim 1 , wherein the second additional item equals to:
10
log
10
(
α
·
M
PSSCH
α
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein M PSCCH indicates the bandwidth of the control channel and M PSSCH indicates the bandwidth of the data channel, and a and b are predefined constants.
4. The method according to claim 3 , wherein the control channel is a physical sidelink control channel (PSCCH) and the data channel is a physical sidelink shared channel (PSSCH).
5. The method according to claim 3 , wherein the transmit power of the control channel equals to:
P
CMAX
,
c
+
10
log
10
(
α
·
M
PSCCH
α
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein P CMAX,c is the maximum transmit power.
6. The method according to claim 1 , wherein the apparatus comprises a terminal device.
7. The method according to claim 1 , wherein the first additional item equals to:
1
0
log
10
(
b
·
M
PSSCH
a
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein M PSCCH indicates the bandwidth of the control channel, M PSSCH indicates the bandwidth of the data channel, and a and b are predefined constants.
8. The method according to claim 7 , wherein the transmit power of the data channel equals to:
P
CMAX
,
c
+
10
log
10
(
α
·
M
PSCCH
α
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein P CMAX,c is the maximum transmit power.
9. 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:
obtain a maximum transmit power;
determine a transmit power of a data channel based on a sum of the maximum transmit power and a first additional item, wherein the first additional item is determined based on a bandwidth of a control channel and a bandwidth of the data channel;
determine a transmit power of the control channel based on a sum of the maximum transmit power and a second additional item, wherein the second additional item is determined based on the bandwidth of the control channel and the bandwidth of the data channel; and
cause a transceiver to send the control channel and the data channel in a same subframe.
10. The apparatus according to claim 9 , wherein the maximum transmit power is a maximum transmit power value configured by a base station or a predefined maximum transmit power value.
11. The apparatus according to claim 9 , wherein the second additional item equals to:
P
CMAX
,
c
+
10
log
10
(
α
·
M
PSCCH
α
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein M PSCCH indicates the bandwidth of the control channel, M PSSCH indicates the bandwidth of the data channel, and a and b are predefined constants.
12. The apparatus according to claim 11 , wherein the control channel is a physical sidelink control channel, PSCCH, and the data channel is a physical sidelink shared channel, PSSCH.
13. The apparatus according to claim 11 , wherein the transmit power of the control channel equals to:
P
CMAX
,
c
+
10
log
10
(
α
·
M
PSCCH
α
·
M
PSCCH
+
b
·
M
PSSCH
)
.
wherein P CMAX,c is the maximum transmit power.
14. The apparatus according to claim 9 , wherein the apparatus comprises a terminal device.
15. The apparatus according to claim 9 , wherein the first additional item equals to:
1
0
log
10
(
b
·
M
PSSCH
a
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein M PSCCH indicates the bandwidth of the control channel, M PSSCH indicates the bandwidth of the data channel, and a and b are predefined constants.
16. The apparatus according to claim 15 , wherein the transmit power of the data channel determined equals to:
P
CMAX
,
c
+
1
0
log
10
(
b
·
M
PSSCH
a
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein P CMAX,c is the maximum transmit power.
17. 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 the steps of:
obtaining a maximum transmit power;
determining a transmit power of a data channel based on a sum of the maximum transmit power and a first additional item, wherein
the first additional item is determined based on a bandwidth of a control channel and a bandwidth of the data channel;
determining a transmit power of a control channel based on a sum of the maximum transmit power and a second additional item, wherein
the second additional item is determined based on the bandwidth of the control channel and the bandwidth of the data channel; and
sending the control channel and the data channel in a same subframe.
18. The non-transitory computer readable storage medium according to claim 17 , wherein the maximum transmit power is a maximum transmit power value configured by a base station or a predefined maximum transmit power value.
19. The non-transitory computer readable storage medium according to claim 17 , wherein the second additional item equals to:
10
log
10
(
α
·
M
PSSCH
α
·
M
PSCCH
+
b
·
M
PSSCH
)
,
wherein M PSCCH indicates the bandwidth of the control channel, M PSSCH indicates the bandwidth of the data channel, and a and b are predefined constants.
20. The non-transitory computer readable storage medium according to claim 19 , wherein the control channel is a physical sidelink control channel, PSCCH, and the data channel is a physical sidelink shared channel, PSSCH.