Power control method and apparatus
This application discloses example power control methods and apparatuses. One example method includes receiving, by a first node, first information sent by a second node, where the first information is used to determine a first transmit power, where the first transmit power is a power used when the first node sends downlink information to the second node through a first link, where the first link is a link between the first node and the second node, and where the first node is an upper-level device of the second node. The first node can then determine the first transmit power based on the first information.
1. A power control method, wherein the method comprises:
receiving, by a first node, first information sent by a second node, wherein the first information is used to determine a first transmit power, wherein the first transmit power is a power used when the first node sends downlink information to the second node through a first link, wherein the first link is a backhaul link between the first node and the second node, wherein the first node is an upper-level relay device of the second node, and wherein the first information comprises a power control parameter P 0 and a path loss compensation coefficient α corresponding to the first link; and
determining, by the first node, the first transmit power based on the first information.
2. The method according to claim 1 , wherein the first information comprises a power adjustment value, and wherein the power adjustment value is used to update an accumulated value f of the power adjustment value.
3. The method according to claim 2 , wherein the determining, by the first node, the first transmit power based on the first information comprises:
determining, by the first node, the first transmit power P BH according to the following formula:
P
BH
=
min
{
P
CMAX
,
10
log
10
(
M
BH
)
+
P
0
+
α
·
PL
+
Δ
TF
+
f
}
,
wherein
P CMAX is a maximum downlink transmit power corresponding to the first link, M BH is a downlink bandwidth corresponding to the first link, Δ TF is a correction value of a preset modulation and coding scheme, and PL is a path loss measurement value corresponding to the first link.
4. The method according to claim 1 , wherein the determining, by the first node, the first transmit power based on the first information comprises:
determining, by the first node, the first transmit power P BH according to the following formula:
P
BH
=
min
{
P
CMAX
,
10
log
10
(
M
BH
)
+
P
0
+
α
·
PL
+
Δ
TF
}
,
wherein
P CMAX is a maximum downlink transmit power corresponding to the first link, M BH is a downlink bandwidth corresponding to the first link, Δ TF is a correction value of a preset modulation and coding scheme, and PL is a path loss measurement value corresponding to the first link.
5. The method according to claim 1 , wherein the first transmit power is the same as or differs by a preset threshold from a power used when the first node sends a reference signal or control information to the second node.
6. A power control method, wherein the method comprises:
determining, by a second node, first information, wherein the first information is used to determine a first transmit power, wherein the first transmit power is a power used when a first node sends downlink information to the second node through a first link, wherein the first link is a backhaul link between the first node and the second node, wherein the first node is an upper-level relay device of the second node, and wherein the first information comprises a power control parameter P 0 and a path loss compensation coefficient α corresponding to the first link; and
sending, by the second node, the first information to the first node.
7. The method according to claim 6 , wherein the first information comprises a power adjustment value, and wherein the power adjustment value is used to update an accumulated value f of the power adjustment value.
8. The method according to claim 6 , further comprising:
updating, by the second node, a preset multiple-input multiple-output (MIMO) configuration parameter; and
updating, by the second node, reference receive power based on the updated preset MIMO configuration parameter.
9. A power control apparatus, wherein the apparatus comprises:
a receiver;
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
receive, by the receiver, first information sent by a second node, wherein the first information is used to determine a first transmit power, wherein the first transmit power is a power used when the apparatus sends downlink information to the second node through a first link, wherein the first link is a backhaul link between the apparatus and the second node, wherein the apparatus is an upper-level relay device of the second node, and wherein the first information comprises a power control parameter P 0 and a path loss compensation coefficient α corresponding to the first link; and
determine the first transmit power based on the first information.
10. The apparatus according to claim 9 , wherein the first information comprises a power adjustment value, and wherein the power adjustment value is used to update an accumulated value f of the power adjustment value.
11. The apparatus according to claim 10 , wherein the programming instructions are for execution by the at least one processor to:
determine the first transmit power P BH according to the following formula:
P
BH
=
min
{
P
CMAX
,
10
log
10
(
M
BH
)
+
P
0
+
α
·
PL
+
Δ
TF
+
f
}
,
wherein
P CMAX is a maximum downlink transmit power corresponding to the first link, M BH is a downlink bandwidth corresponding to the first link, Δ TF is a correction value of a preset modulation and coding scheme, and PL is a path loss measurement value corresponding to the first link.
12. The apparatus according to claim 9 , wherein the programming instructions are for execution by the at least one processor to:
determine the first transmit power P BH according to the following formula:
P
BH
=
min
{
P
CMAX
,
10
log
10
(
M
BH
)
+
P
0
+
α
·
PL
+
Δ
TF
}
,
wherein
P CMAX is a maximum downlink transmit power corresponding to the first link, M BH is a downlink bandwidth corresponding to the first link, Δ TF is a correction value of a preset modulation and coding scheme, and PL is a path loss measurement value corresponding to the first link.
13. A power control apparatus, wherein the apparatus comprises:
a transmitter;
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
determine first information, wherein the first information is used to determine a first transmit power, wherein the first transmit power is a power used when a first node sends downlink information to the power control apparatus through a first link, wherein the first link is a backhaul link between the first node and the power control apparatus, and wherein the first node is an upper-level relay device of the power control apparatus; and
send, by the transmitter, the first information to the first node.
14. The apparatus according to claim 13 , wherein the first information comprises a power adjustment value, and wherein the power adjustment value is used to update an accumulated value f of the power adjustment value.
15. The apparatus according to claim 14 , wherein the programming instructions are for execution by the at least one processor to:
determine the first transmit power P BH according to the following formula:
P
BH
=
min
{
P
CMAX
,
10
log
10
(
M
BH
)
+
P
0
+
α
·
PL
+
Δ
TF
+
f
}
,
wherein
P CMAX is a maximum downlink transmit power corresponding to the first link, M BH is a downlink bandwidth corresponding to the first link, Δ TF is a correction value of a preset modulation and coding scheme, and PL is a path loss measurement value corresponding to the first link.
16. The apparatus according to claim 13 , wherein the programming instructions are for execution by the at least one processor to:
determine the first transmit power P BH according to the following formula:
P
BH
=
min
{
P
CMAX
,
10
log
10
(
M
BH
)
+
P
0
+
α
·
PL
+
Δ
TF
}
,
wherein
P CMAX is a maximum downlink transmit power corresponding to the first link, M BH is a downlink bandwidth corresponding to the first link, Δ TF is a correction value of a preset modulation and coding scheme, and PL is a path loss measurement value corresponding to the first link.