Uplink power scaling for advanced wireless communication systems
A method of a user equipment (UE) for an uplink power control is provided. The method comprises receiving, from a base station (BS), configuration information indicating a power scaling value (β) to be applied to a physical uplink shared channel (PUSCH) transmission, determining, based on the received configuration information, the power scaling value (β) for the PUSCH transmission from values of β = 1 or β = ρ 0 ρ , where ρ 0 is a number of antenna ports with a non-zero PUSCH transmission power and ρ is a number of sounding reference signal (SRS) ports, and transmitting the PUSCH transmission with a linear value ({circumflex over (P)}) of transmit power scaled based on the determined power scaling value (β), where the linear value ({circumflex over (P)}) of the transmit power after power scaling, β×{circumflex over (P)}, is divided equally across the antenna ports on which the UE transmits the PUSCH transmission with non-zero power.
1. A terminal, comprising:
a transceiver configured to
receive, from a base station (BS), a first message including a parameter indicating one of three modes for an uplink full power transmission of the terminal, wherein the three modes comprise a first mode, a second mode, and a third mode,
receive, from the base station, a second message relating to a transmit precoding matrix indicator (TPMI); and
a processor operably connected to the transceiver, the processor configured to scale a transmit power for a physical uplink shared channel (PUSCH) by a scaling factor, the scaling factor being determined based on a mode indicated by the parameter,
wherein the transceiver is further configured to:
transmit, to the base station, information on a group of full power TPMIs for the terminal, and
transmit, to the base station, the PUSCH based on the scaled transmit power,
wherein, based on the parameter indicating the first mode, the scaling factor is a ratio of a number of antenna ports with non-zero PUSCH transmission power over a maximum number of sounding reference signal (SRS) ports supported by the terminal in one SRS resource,
wherein, based on the parameter indicating the second mode, the scaling factor is determined based on the TPMI as one or a ratio of the number of the antenna ports with non-zero PUSCH transmission power over a number of SRS ports,
wherein, based on the TPMI and the parameter indicating the second mode:
the scaling factor is one, in response to the TPMI being included in the group of full power TPMIs, and
the scaling factor is the ratio of the number of the antenna ports with the non-zero PUSCH transmission power over a number of the SRS ports corresponding to an SRS resource for the TPMI, in response to the TPMI not being included in the group of full power TPMIs, and
wherein, based on the parameter indicating the third mode, the scaling factor is one.
2. The terminal of claim 1 , wherein, based on the TPMI and the parameter indicating the first mode, the scaling factor is the ratio of the number of the antenna ports with the non-zero PUSCH transmission power over the maximum number of the SRS ports supported by the terminal in the one SRS resource.
3. The terminal of claim 2 , wherein, in response to more than one SRS resource being configured in an SRS resource set, the number of the SRS ports for the TPMI is determined based on an SRS resource indicated by an SRS resource indicator (SRI) field, and
wherein, in response to only one SRS resource being configured, the number of the SRS ports for the TPMI is determined based on the one configured SRS resource.
4. The terminal of claim 1 , wherein the transceiver is configured to transmit the PUSCH by splitting the scaled transmit power equally across antenna ports with the non-zero PUSCH transmission power.
5. The terminal of claim 1 , wherein the second message relating to the TPMI comprises a radio resource control (RRC) message or downlink control information (DCI).
6. The terminal of claim 1 , wherein the parameter indicates one of the three modes based on a capability of the terminal for each mode reported to the base station.
7. A base station (BS), comprising:
a transceiver configured to:
transmit, to a terminal, a first message including a parameter indicating one of three modes for an uplink full power transmission of the terminal, wherein the three modes comprise a first mode, a second mode, and a third mode,
transmit, to the terminal, a second message relating to a transmit precoding matrix indicator (TPMI),
receive, from the terminal, a physical uplink shared channel (PUSCH) transmission having a transmit power scaled based on a scaling factor, the scaling factor being determined based on a mode indicated by the parameter,
receive, from the terminal, information on a group of full power TPMIs for the terminal, and
wherein, based on the parameter indicating the first mode, the scaling factor is a ratio of a number of antenna ports with non-zero PUSCH transmission power over a maximum number of sounding reference signal (SRS) ports supported by the terminal in one SRS resource,
wherein, based on the parameter indicating the second mode, the scaling factor is determined based on the TPMI as one or a ratio of the number of the antenna ports with the non-zero PUSCH transmission power over a number of SRS ports,
wherein, based on the TPMI and the parameter indicating the second mode:
the scaling factor is one, in response to the TPMI being included in the group of full power TPMIs, and
the scaling factor is the ratio of the number of the antenna ports with the non-zero PUSCH transmission power over a number of the SRS ports corresponding to an SRS resource for the TPMI, in response to the TPMI not being included in the group of full power TPMIs, and
wherein, based on the parameter indicating the third mode, the scaling factor is one.
8. The BS of claim 7 , wherein based on the TPMI and the parameter indicating the first mode, the scaling factor is the ratio of the number of the antenna ports with the non-zero PUSCH transmission power over the maximum number of SRS ports supported by the terminal in the one SRS resource.
9. The BS of claim 8 , wherein, in response to more than one SRS resource being configured in an SRS resource set, the number of the SRS ports for the TPMI is determined based on an SRS resource indicated by an SRS resource indicator (SRI) field, and
wherein, in response to only one SRS resource being configured, the number of the SRS ports for the TPMI is determined based on the one configured SRS resource.
10. The BS of claim 7 , wherein the transceiver is configured to receive the PUSCH for which the transmit power is split equally across antenna ports with the non-zero PUSCH transmission power.
11. The BS of claim 7 , wherein the second message relating to the TPMI comprises a radio resource control (RRC) message or downlink control information (DCI).
12. The BS of claim 7 , wherein the parameter indicates one of the three modes based on a capability of the terminal for each mode reported to the base station.
13. A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station (BS), a first message including a parameter indicating one of three modes for an uplink full power transmission of the terminal, wherein the three modes comprise a first mode, a second mode, and a third mode;
receiving, from the base station, a second message relating to a transmit precoding matrix indicator (TPMI);
scaling a transmit power for a physical uplink shared channel (PUSCH) by a scaling factor, the scaling factor being determined based on a mode indicated by the parameter;
transmitting, to the base station, the PUSCH based on the scaled transmit power; and
transmitting, to the base station, information on a group of full power TPMIs for the terminal,
wherein, based on the parameter indicating the first mode, the scaling factor is a ratio of a number of antenna ports with non-zero PUSCH transmission power over a maximum number of sounding reference signal (SRS) ports supported by the terminal in one SRS resource,
wherein, based on the parameter indicating the second mode, the scaling factor is determined based on the TPMI as one or a ratio of the number of the antenna ports with the non-zero PUSCH transmission power over a number of SRS ports,
wherein, based on the TPMI and the parameter indicating the second mode:
the scaling factor is one, in response to the TPMI being included in the group of full power TPMIs, and
the scaling factor is the ratio of the number of the antenna ports with non-zero PUSCH transmission power over a number of the SRS ports corresponding to an SRS resource for the TPMI, in response to the TPMI not being included in the group of full power TPMIs, and
wherein, based on the parameter indicating the third mode, the scaling factor is one.
14. The method of claim 13 , wherein, based on the TPMI and the parameter indicating the first mode, the scaling factor is the ratio of the number of the antenna ports with the non-zero PUSCH transmission power over uthe maximum number of SRS ports supported by the terminal in the one SRS resource.
15. The method of claim 14 , wherein, in response to more than one SRS resource being configured in an SRS resource set, the number of the SRS ports for the TPMI is determined based on an SRS resource indicated by an SRS resource indicator (SRI) field, and
wherein, in response to only one SRS resource being configured, the number of the SRS ports for the TPMI is determined based on the one configured SRS resource.
16. The method of claim 13 , wherein the terminal transmits the PUSCH by splitting the scaled transmit power equally across antenna ports with the non-zero PUSCH transmission power.
17. The method of claim 13 , wherein the second message relating to the TPMI comprises a radio resource control (RRC) message or downlink control information (DCI).
18. The method of claim 13 , wherein the parameter indicates one of the three modes based on a capability of the terminal for each mode reported to the base station.