# US 11,910,328 B2 · Applying amplitude drooping for adjacent bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,328 B2 - Document ID: US11910328B2 - Status: Granted - Kind: B2 - Application number: 17/305,204 - Filed: 2021-07-01 - Published: 2023-01-05 - Granted: 2024-02-20 - Earliest claimed: 2021-07-01 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Ahmed Attia Abotabl; Muhammad Sayed Khairy Abdelghaffar; Krishna Kiran Mukkavilli - Web page: https://patentgrep.com/patent/US11910328B2 ## CPC - H04W 52/146: {Uplink power control} - H04W 52/243: {taking into account interferences} - H04B 17/318: Received signal strength - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0058: {Allocation criteria} - H04L 5/0062: {Avoidance of ingress interference, e.g. ham radio channels} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 52/247: {where the output power of a terminal is based on a path parameter sent by another terminal} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station via the transceiver, an indication to apply an amplitude drooping based at least in part on an uplink band being adjacent to a downlink band in a full-duplex operation. The UE may transmit, to the base station via the transceiver, an uplink transmission in the uplink band based at least in part on the amplitude drooping. Numerous other aspects are described. ## Claims ### Claim 1 An apparatus for wireless communication at a user equipment (UE), comprising: a memory; a transceiver; and one or more processors, coupled to the memory, configured to: receive, from a base station via the transceiver, an indication to apply amplitude drooping to change a signal power of a signal based at least in part on an uplink band being adjacent to a downlink band in a full-duplex operation, the amplitude drooping changing the signal power due to at least one of radio frequency filtering applied to the signal or a frequency response of a digital or analog conversion; and transmit, to the base station via the transceiver, an uplink transmission in the uplink band based at least in part on the amplitude drooping. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the amplitude drooping is associated with the change in the signal power within a specified measurement window. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further configured to: apply the amplitude drooping based at least in part on the indication received from the base station, the one or more processors configured to apply the amplitude drooping by adjusting one or more coefficients associated with the radio frequency filtering applied to the signal, the signal being associated with the uplink transmission. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the uplink transmission is transmitted in the uplink band based at least in part on the amplitude drooping to reduce a self-interference at the UE for a downlink reception in the downlink band that is adjacent to the uplink band. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further configured to: transmit, to the base station via the transceiver, an indication of an amplitude drooping capability that indicates at least one amplitude drooping capability of the UE, wherein the at least one amplitude drooping capability is with respect to one or more of a frequency band, a bandwidth, a center frequency, or the amplitude drooping, and wherein the indication to apply the amplitude drooping is responsive to the indication of the amplitude drooping capability. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the indication of the amplitude drooping capability is associated with a configured bandwidth part. ### Claim 7 (depends on 5) The apparatus of claim 5, wherein the one or more processors, to transmit the indication of the amplitude drooping capability, are configured to transmit the indication of the amplitude drooping capability in one of uplink control information, an uplink shared channel, or UE assistance information. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the one or more processors, to receive the indication to apply the amplitude drooping, are configured to receive the indication to apply the amplitude drooping via downlink control information or a medium access control control element. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the indication to apply the amplitude drooping indicates an amplitude drooping value to be applied by the UE, wherein the amplitude drooping value corresponds to an extent of amplitude drooping to be applied by the UE. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further configured to: apply an amplitude drooping value for an active bandwidth part, wherein the amplitude drooping value is associated with a radio resource control (RRC) configuration; or apply an amplitude drooping value based at least in part on a guard band between the downlink band and the uplink band, wherein the guard band is defined based at least in part on the RRC configuration. ### Claim 11 An apparatus for wireless communication at a base station, comprising: a memory; a transceiver; and one or more processors, coupled to the memory, configured to: transmit, to a user equipment (UE) via the transceiver, an indication to apply amplitude drooping to change a signal power of a signal based at least in part on an uplink band being adjacent to a downlink band in a full-duplex operation, the amplitude drooping changing the signal power due to at least one of radio frequency filtering applied to the signal or a frequency response of a digital or analog conversion; and receive, from the UE via the transceiver, an uplink transmission in the uplink band based at least in part on the amplitude drooping. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the uplink transmission is received in the uplink band based at least in part on the amplitude drooping to reduce a self-interference at the UE for a downlink reception in the downlink band that is adjacent to the uplink band. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the one or more processors are further configured to: receive, from the UE via the transceiver, an indication of an amplitude drooping capability that indicates at least one amplitude drooping capability of the UE, wherein the at least one amplitude drooping capability is with respect to one or more of a frequency band, a bandwidth, a center frequency, or the amplitude drooping, and wherein the one or more processors, to transmit the indication to apply the amplitude drooping, are configured to transmit the indication to apply the amplitude drooping based at least in part on the indication of the amplitude drooping capability. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the one or more processors, to transmit the indication to apply the amplitude drooping, are configured to transmit the indication to apply the amplitude drooping via downlink control information or a medium access control control element. ### Claim 15 (depends on 11) The apparatus of claim 11, wherein the indication to apply the amplitude drooping indicates an amplitude drooping value to be applied by the UE, wherein the amplitude drooping value corresponds to an extent of amplitude drooping to be applied by the UE. ### Claim 16 A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a base station, an indication to apply amplitude drooping to change a signal power of a signal based at least in part on an uplink band being adjacent to a downlink band in a full-duplex operation, the amplitude drooping changing the signal power due to at least one of radio frequency filtering applied to the signal or a frequency response of a digital or analog conversion; and transmitting, to the base station, an uplink transmission in the uplink band based at least in part on the amplitude drooping. ### Claim 17 (depends on 16) The method of claim 16, wherein the amplitude drooping is associated with the change in the signal power within a specified measurement window. ### Claim 18 (depends on 16) The method of claim 16, further comprising: applying the amplitude drooping based at least in part on the indication received from the base station, wherein applying the amplitude drooping comprises adjusting one or more coefficients associated with the radio frequency filtering applied to the signal, the signal being associated with the uplink transmission. ### Claim 19 (depends on 16) The method of claim 16, wherein the uplink transmission is transmitted in the uplink band based at least in part on the amplitude drooping to reduce a self-interference at the UE for a downlink reception in the downlink band that is adjacent to the uplink band. ### Claim 20 (depends on 16) The method of claim 16, further comprising: transmitting, to the base station, an indication of an amplitude drooping capability that indicates at least one amplitude drooping capability of the UE, wherein the at least one amplitude drooping capability is with respect to one or more of a frequency band, a bandwidth, a center frequency, or the amplitude drooping, and wherein the indication to apply the amplitude drooping is responsive to the indication of the amplitude drooping capability. ### Claim 21 (depends on 20) The method of claim 20, wherein the indication of the amplitude drooping capability is associated with a configured bandwidth part. ### Claim 22 (depends on 20) The method of claim 20, wherein transmitting the indication of the amplitude drooping capability comprises transmitting the indication of the amplitude drooping capability in one of uplink control information, an uplink shared channel, or UE assistance information. ### Claim 23 (depends on 16) The method of claim 16, wherein receiving the indication to apply the amplitude drooping comprises receiving the indication to apply the amplitude drooping via downlink control information or a medium access control control element. ### Claim 24 (depends on 16) The method of claim 16, wherein the indication to apply the amplitude drooping indicates an amplitude drooping value to be applied by the UE, wherein the amplitude drooping value corresponds to an extent of amplitude drooping to be applied by the UE. ### Claim 25 (depends on 16) The method of claim 16, further comprising: applying an amplitude drooping value for an active bandwidth part, wherein the amplitude drooping value is associated with a radio resource control (RRC) configuration; or applying an amplitude drooping value based at least in part on a guard band between the downlink band and the uplink band, wherein the guard band is defined based at least in part on the RRC configuration. ### Claim 26 A method of wireless communication performed by a base station, comprising: transmitting, to a user equipment (UE), an indication to apply amplitude drooping to change a signal power of a signal based at least in part on an uplink band being adjacent to a downlink band in a full-duplex operation, the amplitude drooping changing the signal power due to at least one of radio frequency filtering applied to the signal or a frequency response of a digital or analog conversion; and receiving, from the UE, an uplink transmission in the uplink band based at least in part on the amplitude drooping. ### Claim 27 (depends on 26) The method of claim 26, wherein the uplink transmission is received in the uplink band based at least in part on the amplitude drooping to reduce a self-interference at the UE for a downlink reception in the downlink band that is adjacent to the uplink band. ### Claim 28 (depends on 26) The method of claim 26, further comprising: receiving, from the UE, an indication of an amplitude drooping capability that indicates at least one amplitude drooping capability of the UE, wherein the at least one amplitude drooping capability is with respect to one or more of a frequency band, a bandwidth, a center frequency, or the amplitude drooping, and receiving the indication to apply the amplitude drooping is based at least in part on the indication of the amplitude drooping capability. ### Claim 29 (depends on 26) The method of claim 26, wherein transmitting the indication to apply the amplitude drooping comprises transmitting the indication to apply the amplitude drooping via downlink control information or a medium access control control element. ### Claim 30 (depends on 26) The method of claim 26, wherein the indication to apply the amplitude drooping indicates an amplitude drooping value to be applied by the UE wherein the amplitude drooping value corresponds to an extent of amplitude drooping to be applied by the UE.