Power control in full duplex systems based on PL-RS for self-interference measurement

Patent metadata

Field	Value
Publication number	US-12550074-B2
Application number	US-202117449437-A
Country	US
Kind code	B2
Filing date	Sep 29, 2021
Priority date	Oct 6, 2020
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for power control in FD systems based on a PL-RS for measuring self-interference. In aspects, a base station may configure a PL-RS for one or more beam pairs and schedule a DL transmission including the PL-RS. A UE may measure self-interference corresponding to the one or more beam pairs based on the PL-RS and adjust an UL Tx power for a FD operation based on the self-interference measured for the one or more beam pairs. The UE may subsequently transmit an UL transmission for the FD operation based on the adjustment to the UL Tx power, such that the base station may receive an UL transmission having an UL Tx power that is based on the measured self-interference associated with the PL-RS.

First claim

What is claimed is:

1 . An apparatus for wireless communication at a user equipment (UE), comprising memory, and one or more processors coupled to the memory, wherein the one or more processors are configured to:
measure self-interference for one or more beam pairs based on one or more path loss (PL) reference signals (RSs) (PL-RSs), wherein a default self-interference value is the measured self-interference; adjust an uplink (UL) transmit (Tx) power for a full duplex (FD) operation based on the self-interference measured for the one or more beam pairs; and transmit an UL transmission for the FD operation based on the adjustment to the UL Tx power, wherein a first maximum value bounding the UL Tx power is based on the measured self-interference and a second maximum value bounding the UL Tx power, different than the first maximum value, corresponds to a maximum Tx power of the UE, and wherein the first maximum value bounding the UL Tx power is based on a threshold level of self-interference, and wherein the one or more processors are further configured to:
select, for power control and based on the measured self-interference, a power offset, an alpha parameter associated with a slope inversion, and an additional offset; and
transmit the UL transmission based on the first maximum value bounding the UL Tx power and the power control.

2 . The apparatus of claim 1 , wherein the UL Tx power is based on a predefined algorithm, at least one parameter in the predefined algorithm being dependent on the measured self-interference.

3 . The apparatus of claim 1 , wherein a level of the self-interference is different for different beam pairs included in the one or more beam pairs.

4 . The apparatus of claim 1 , wherein the self-interference for the one or more beam pairs changes based on at least one of a time period or an environment.

5 . The apparatus of claim 4 , wherein the one or more processors are further configured to re-measure the self-interference for the one or more beam pairs on a periodic basis.

6 . An apparatus for wireless communication at a user equipment (UE), comprising memory, and one or more processors coupled to the memory, wherein the one or more processors are configured to:
measure self-interference for one or more beam pairs based on a pre-configuration one or more path loss (PL) reference signals (RSs) (PL-RSs), wherein a default self-interference value is the measured self-interference; adjust an uplink (UL) transmit (Tx) power for a full duplex (FD) operation based on the self-interference measured for the one or more beam pairs; and transmit an UL transmission for the FD operation based on the adjustment to the UL Tx power, wherein the one or more processors are further configured to:
determine whether the one or more PL-RSs are pre-configured or not pre-configured; and
apply the default self-interference value as the measured self-interference when the one or more PL-RSs are not pre-configured.

7 . The apparatus of claim 6 , wherein the one or more processors are further configured to receive the one or more PL-RSs for each beam pair included in the one or more beam pairs when the one or more PL-RSs are pre-configured.

8 . The apparatus of claim 6 , wherein the one or more processors are further configured to receive a pre-configuration for the one or more PL-RSs via radio resource control (RRC) signaling, and wherein the one or more processors are further configured to receive an update for the one or more PL-RSs in association with at least one of a medium access control- control element (MAC-CE) or downlink control information (DCI).

9 . The apparatus of claim 6 , wherein the one or more PL-RSs are associated with the UL transmission and a downlink (DL) reception, the UL transmission corresponding to an UL beam in the one or more beam pairs, the DL reception corresponding to a DL beam in the one or more beam pairs.

10 . The apparatus of claim 9 , wherein the UL transmission is at least one of a sounding reference signal (SRS), a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a physical random access channel (PRACH).

11 . The apparatus of claim 9 , wherein the DL reception is at least one of a channel state information-reference signal (CSI-RS), a tracking reference signal (TRS), or a demodulation reference signal (DM-RS).

12 . A method of wireless communication at a user equipment (UE), comprising:
measuring self-interference for one or more beam pairs based on one or more path loss (PL) reference signals (RSs) (PL-RSs), wherein a default self-interference value is the measured self-interference; adjusting an uplink (UL) transmit (Tx) power for a full duplex (FD) operation based on the self-interference measured for the one or more beam pairs; and transmitting an UL transmission for the FD operation based on the adjustment to the UL Tx power, wherein a first maximum value bounding the UL Tx power is based on the measured self-interference and a second maximum value bounding the UL Tx power, different than the first maximum value, corresponds to a maximum Tx power of the UE, and wherein the first maximum value bounding the UL Tx power is based on a threshold level of self-interference, and wherein the method further comprises:
selecting, for power control and based on the measured self-interference, a power offset, an alpha parameter associated with a slope inversion, and an additional offset; and
transmitting the UL transmission based on the first maximum value bounding the UL Tx power and the power control.

13 . The method of claim 12 , wherein the UL Tx power is based on a predefined algorithm, at least one parameter in the predefined algorithm being dependent on the measured self-interference.

14 . The method of claim 12 , wherein a level of the self-interference is different for different beam pairs included in the one or more beam pairs.

15 . The method of claim 12 , wherein the self-interference for the one or more beam pairs changes based on at least one of a time period or an environment.

16 . The method of claim 15 , wherein the method further comprises re-measuring the self-interference for the one or more beam pairs on a periodic basis.

17 . A method of wireless communication at a user equipment (UE), comprising:
measuring self-interference for one or more beam pairs based on a pre-configuration one or more path loss (PL) reference signals (RSs) (PL-RSs), wherein a default self-interference value is the measured self-interference; adjusting an uplink (UL) transmit (Tx) power for a full duplex (FD) operation based on the self-interference measured for the one or more beam pairs; and transmitting an UL transmission for the FD operation based on the adjustment to the UL Tx power, wherein the method further comprises:
determining whether the one or more PL-RSs are pre-configured or not pre-configured; and
applying the default self-interference value as the measured self-interference when the one or more PL-RSs are not pre-configured.

18 . The method of claim 17 , wherein the method further comprises receiving the one or more PL-RSs for each beam pair included in the one or more beam pairs when the one or more PL-RSs are pre-configured.

19 . The method of claim 17 , wherein the method further comprises:
receiving a pre-configuration for the one or more PL-RSs via radio resource control (RRC) signaling; and receiving an update for the one or more PL-RSs in association with at least one of a medium access

Assignees

• Qualcomm Inc

Inventors

• Bai Tianyang
• Wang Hua
• Venugopal Kiran
• Li Junyi
• Raghavan Vasanthan
• Ryu Jung Ho
• Zhang Qian
• Abedini Navid
• Zhou Yan
• Luo Tao

Classifications

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04W52/146 Primary

  Uplink power control · CPC title

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04W52/24

  using SIR [Signal to Interference Ratio] or other wireless path parameters · CPC title