Indication information sending method, indication information receiving method, device, and system
An indication information sending method includes that a base station generates first indication information, and send the first indication information to a terminal device; and where the first indication information is used to indicate a power control manner of a first channel, the power control manner of the first channel is one power control manner in a power control manner set, and the power control manner set comprises a transmit power of a signal on the first channel is determined by a terminal device based on a first parameter; or a transmit power of a signal on the first channel is determined by a terminal device according to a rule predefined on the terminal device.
1. A communication method, comprising:
determining whether first indication information for determining transmit powe of a signal on a narrowband physical random access channel (NPRACH) based on a first parameter for determinationof transmit power has been received;
after determining that the first indication information has been received, determining the transmit power of the signal on the NPRACH based on the first parameter; or
after determining that the first indication information has not been received, determining:
the transmit power of the signal on the NPRACH based on a second parameter for determination of transmit power when coverage level of the signal on the NPRACH is less than or equal to a second level; or
the transmit power of the signal on the NPRACH is the maximum transmit power of a terminal device when the coverage level of the signal on the NPRACH is greater than the second level; and
sending the signal based on the determined transmit power of the signal on the NPRACH.
2. The method according to claim 1 , wherein the second level is coverage level 0.
3. The method according to claim 1 , wherein the first parameter comprises a path loss, the maximum transmit power of the terminal device and a preamble received target power, and the transmit power of the signal on the NPRACH is determined based on the first parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the terminal device, P PRT represents the preamble received target power, and PL c represents the downlink path loss.
4. The method according to claim 1 , wherein the second parameter comprises a path loss, the maximum transmit power of the terminal device and a preamble received target power, the transmit power of the signal on the NPRACH is determined based on the second parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the terminal device, P PRT represents the preamble received target power, and PL c represents the downlink path loss.
5. A communication method, comprising:
determining a manner in which a terminal device determines a transmit power of a signal on a narrowband physical random access channel (NPRACH), the manner comprising one of the following:
determining the transmit power of the signal on the NPRACH according to a first parameter for determination of transmit power;
determining the transmit power of the signal on the NPRACH according to a second parameter for determination of tranmsit power when coverage level of the signal on the NPRACH is less than or equal to a second level; and
determining that the transmit power of the signal on the NPRACH is the maximum transmit power of the terminal device when the coverage level of the signal on the NPRACH is greater than the second level;
sending first indication information to the terminal device after determining that the terminal device has determined the transmit power of the signal on the NPRACH based on the first parameter; and
not sending the first indication information to the terminal device after determining that the terminal device has determined the transmit power of the signal on the NPRACH based on the second parameter, or after determining that the terminal device has determined the transmit power of the signal on the NPRACH is the maximum transmit power of the terminal device.
6. The method according to claim 5 , wherein the second level is coverage level 0.
7. The method according to claim 5 , wherein the first parameter comprises a path loss, the maximum transmit power of the terminal device and a preamble received target power, and the transmit power of the signal on the NPRACH is determined based on the first parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the terminal device, P PRT represents the preamble received target power, and PL c represents the downlink path loss.
8. The method according to claim 5 , wherein the second parameter comprises a path loss, the maximum transmit power of the terminal device and a preamble received target power, and the transmit power of the signal on the NPRACH is determined based on the second parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the terminal device, P PRT represents the preamble received target power, PL c represents the downlink path loss.
9. A communication apparatus, comprising:
a processor, configured to determine whether first indication information for determining transmit power of signal on a narrowband physical random access channel (NPRACH) based on a first parameter for determination of transmit power has been received, wherein:
after determining that the first indication information has been received, the processor determines the transmit power of the signal on the NPRACH based on the first parameter;
after determining that the first indication information has not been received, the processor determines:
the transmit power of the signal on the NPRACH based on a second parameter for determination of transmit power when coverage level of the signal on the NPRACH is less than or equal to a second level; or
determine the transmit power of the signal on the NPRACH is the maximum transmit power when the coverage level of the signal on the NPRACH is greater than the second level; and
a transmitter, configured to send the signal based on the transmit power of the signal on the NPRACH.
10. The apparatus according to claim 9 , wherein the second level is coverage level 0.
11. The apparatus according to claim 9 , wherein the first parameter comprises a path loss, the maximum transmit power of the apparatus and a preamble received target power, and the transmit power of the signal on the NPRACH is determined based on the first parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the apparatus, P PRT represents the preamble received target power, and PL c represents the downlink path loss.
12. The apparatus according to claim 9 , wherein the second parameter comprises a path loss, the maximum transmit power of the apparatus and a preamble received target power, and the transmit power of the signal on the NPRACH is determined based on the second parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the apparatus, P PRT represents the preamble received target power, and PL c represents the downlink path loss.
13. A communication apparatus, comprising:
a processor, configured to determine a manner in which a terminal device determines a transmit power of a signal on a narrowband physical random access channel (NPRACH), the manner comprising one of the following:
determining the transmit power of the signal on the NPRACH according to a first parameter for determination of transmit power;
determining the transmit power of the signal on the NPRACH according to a second parameter for determination of transmit power when coverage level of the signal on the NPRACH is less than or equal to a second level; and
determination of transmit power when coverage level of the signal on the NPRACH is the maximum transmit power of the terminal device when coverage level of the signal on the NPRACH is greater than the second level;
a transmitter, configured to:
send first indication information to the terminal device after the determining that the terminal device has determined the transmit power of the signal on the NPRACH based on the first parameter; and
not send the first indication information to the terminal devicee after determining that the terminal device has determined:
the transmit power of the signal on the NPRACH based on the second parameter; or
after determining that the terminal device has determined transmit power of the signal on the NPRACH is the maximum transmit power of the terminal device.
14. The apparatus according to claim 13 , wherein the second level is coverage level 0.
15. The apparatus according to claim 13 , wherein the first parameter comprises a path loss, the maximum transmit power of the terminal device and a preamble received target power, and the transmit power of the signal on the NPRACH is determined based on the first parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the terminal device, P PRT represents the preamble received target power, and PL c represents the downlink path loss.
16. The apparatus according to claim 13 , wherein the first channel is the NPRACH, the second parameter comprises a path loss, the maximum transmit power of the terminal device and a preamble received target power, the transmit power of the signal on the NPRACH that is determined based on the second parameter in accordance with the following formula:
P
NPRACH
=
min
{
P
CMAX
,
c
(
i
)
,
P
PRT
+
PL
c
}
(
dBm
)
,
wherein
P NPRACH represents the transmit power of the signal on the NPRACH, P CMAX,c (i) represents the maximum transmit power of the terminal device, P PRT represents the preamble received target power, PL c represents the downlink path loss.