# US 12,192,772 B2 · Techniques for configuring physical layer signature feedback in wireless communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,772 B2 - Document ID: US12192772B2 - Status: Granted - Kind: B2 - Application number: 17/945,315 - Filed: 2022-09-15 - Published: 2024-03-21 - Granted: 2025-01-07 - Earliest claimed: 2022-09-15 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Igor Gutman; Yavuz Yapici; Tao Luo - Web page: https://patentgrep.com/patent/US12192772B2 ## CPC - H04W 12/122: Counter-measures against attacks; Protection against rogue devices - H04W 12/40: Security arrangements using identity modules - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, systems, and devices for wireless communications are described for physical layer signature feedback to enhance security in wireless communications. A user equipment (UE) and a network entity may apply a physical layer signature, such as an artificial physical layer impairment, to one or more physical layer signals that may be measured to identify a physical layer signature of the associated physical layer signal. The UE, upon receipt of a physical layer signal, may check if the identified signal includes a physical layer signature of a set of valid physical layer signatures. If the received physical layer signature matches a valid physical layer signature, the UE may operate in accordance with procedures associated with the signal. If the received physical layer signature does not match a valid physical layer signature, the UE may transmit a message to the network entity that indicates an unmatched physical layer signature. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving configuration information for at least one physical layer signal that is modified by a physical layer signature, the physical layer signature is associated with a set of parameters that are applied to the physical layer signal; generating a set of estimated parameters of a received physical layer signature of a received physical layer signal; identifying a mismatch between the set of estimated parameters of the received physical layer signature and the set of parameters provided in the configuration information; and transmitting, based at least in part on the identified mismatch, an indication of the mismatch to a network entity, the indication of the mismatch including the set of estimated parameters of the received physical layer signature. ### Claim 2 (depends on 1) The method of claim 1, further comprising: comparing the set of estimated parameters of the received physical layer signature to a plurality of valid sets of physical layer signature parameters, and wherein the set of estimated parameters is transmitted to the network entity based at least in part on the set of estimated parameters being absent from the plurality of valid sets of physical layer parameters. ### Claim 3 (depends on 1) The method of claim 1, wherein the transmitting the set of estimated parameters of the received physical layer signature comprises: transmitting a medium access control (MAC) control element, or radio resource control (RRC) signaling, that indicates the set of estimated parameters of the received physical layer signature. ### Claim 4 (depends on 1) The method of claim 1, wherein the set of estimated parameters of the received physical layer signature include one or more amplitude parameters, one or more phase parameters, one or more frequency parameters, or any combinations thereof. ### Claim 5 (depends on 4) The method of claim 4, wherein the set of estimated parameters include one or more of an amplitude vector of an amplitude-to-amplitude modulation (AM/AM) physical layer signature applied to the received physical layer signal, a phase vector of an amplitude-to-phase modulation (AM/PM) physical layer signature applied to the received physical layer signal, a set of vectors of impulse responses of a frequency domain residual sideband (FDRSB) estimation of the received physical layer signal, or any combinations thereof. ### Claim 6 (depends on 1) The method of claim 1, wherein the set of estimated parameters include an indication of a resource allocation associated with the received physical layer signal. ### Claim 7 (depends on 6) The method of claim 6, wherein the indication of the resource allocation associated with the received physical layer signal includes one or more of a system frame number, a subframe number, a slot index, a symbol index, a bandwidth part (BWP), a resource block (RB) offset within the BWP, a number of RBs, a receive beam index, or any combinations thereof. ### Claim 8 (depends on 1) The method of claim 1, wherein the set of estimated parameters are provided for verification at the network entity of a validity of the received physical layer signal. ### Claim 9 (depends on 1) The method of claim 1, further comprising: receiving, from the network entity, an indication that the received physical layer signature is a valid signature or an invalid signature. ### Claim 10 (depends on 9) The method of claim 9, further comprising: receiving, from the network entity, an indication of a time period associated with the indication that the received physical layer signature is a valid signature, wherein the received physical layer signature is considered invalid after an expiration of the time period. ### Claim 11 (depends on 9) The method of claim 9, further comprising: adding the received physical layer signature to a list of valid physical layer signatures at the UE. ### Claim 12 A method for wireless communication at a network entity, comprising: transmitting configuration information to a user equipment (UE) for at least one physical layer signal that is modified by a physical layer signature, the physical layer signature associated with a set of parameters that are applied to the physical layer signal; receiving, from the UE, an indication of a mismatch between a set of estimated parameters of a received physical layer signature received at the UE and the set of parameters provided in the configuration information; and transmitting, to the UE, an indication that the set of estimated parameters is associated with a valid physical layer signature or an invalid physical layer signature based at least in part on whether the set of estimated parameters corresponds to a neighboring physical layer signature of one or more neighboring network entities. ### Claim 13 (depends on 12) The method of claim 12, further comprising: comparing the set of estimated parameters to a plurality of valid sets of physical layer signature parameters, and wherein the indication that the set of estimated parameters is associated with an invalid physical layer signature is based at least in part on the estimated parameters being absent from the plurality of valid sets of physical layer parameters. ### Claim 14 (depends on 12) The method of claim 12, wherein the receiving the set of estimated parameters comprises: receiving a medium access control (MAC) control element, or radio resource control (RRC) signaling, that indicates the set of estimated parameters. ### Claim 15 (depends on 12) The method of claim 12, wherein the set of estimated parameters of the received physical layer signature include one or more of an amplitude vector of an amplitude-to-amplitude modulation (AM/AM) physical layer signature applied to the received physical layer signal, a phase vector of an amplitude-to-phase modulation (AM/PM) physical layer signature applied to the received physical layer signal, a set of vectors of impulse responses of a frequency domain residual sideband (FDRSB) estimation of the received physical layer signal, or any combinations thereof. ### Claim 16 (depends on 12) The method of claim 12, wherein the estimated physical layer signature parameters include an indication of a resource allocation associated with the received physical layer signature received at the UE. ### Claim 17 (depends on 16) The method of claim 16, wherein the indication of the resource allocation associated with the received physical layer signature received at the UE includes one or more of a system frame number, a subframe number, a slot index, a symbol index, a bandwidth part (BWP), a resource block (RB) offset within the BWP, a number of RBs, a receive beam index, or any combinations thereof. ### Claim 18 (depends on 12) The method of claim 12, further comprising: transmitting an indication of a time period associated with the indication that the set of estimated parameters is associated with a valid physical layer signature, wherein the received physical layer signature is considered invalid after an expiration of the time period. ### Claim 19 An apparatus for wireless communication at a user equipment (UE), comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive configuration information for at least one physical layer signal that is modified by a physical layer signature, the physical layer signature is associated with a set of parameters that are applied to the physical layer signal; generate a set of estimated parameters of a received physical layer signature of a received physical layer signal; identify a mismatch between the set of estimated parameters of the received physical layer signature and the set of parameters provided in the configuration information; and transmit, based at least in part on the identified mismatch, an indication of the mismatch to a network entity, the indication of the mismatch including the set of estimated parameters of the received physical layer signature. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the instructions are further executable by the processor to cause the apparatus to: compare the set of estimated parameters of the received physical layer signature to a plurality of valid sets of physical layer signature parameters, and wherein the set of estimated parameters is transmitted to the network entity based at least in part on the set of estimated parameters being absent from the plurality of valid sets of physical layer parameters. ### Claim 21 (depends on 19) The apparatus of claim 19, wherein the set of estimated parameters of the received physical layer signature include one or more amplitude parameters, one or more phase parameters, one or more frequency parameters, or any combinations thereof. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the set of estimated parameters include one or more of an amplitude vector of an amplitude-to-amplitude modulation (AM/AM) physical layer signature applied to the received physical layer signal, a phase vector of an amplitude-to-phase modulation (AM/PM) physical layer signature applied to the received physical layer signal, a set of vectors of impulse responses of a frequency domain residual sideband (FDRSB) estimation of the received physical layer signal, or any combinations thereof. ### Claim 23 (depends on 19) The apparatus of claim 19, wherein the instructions are further executable by the processor to cause the apparatus to: receive, from the network entity, an indication that the received physical layer signature is a valid signature or an invalid signature. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the instructions are further executable by the processor to cause the apparatus to: receive, from the network entity, an indication of a time period associated with the indication that the received physical layer signature is a valid signature, wherein the received physical layer signature is considered invalid after an expiration of the time period. ### Claim 25 (depends on 23) The apparatus of claim 23, wherein the instructions are further executable by the processor to cause the apparatus to: add the received physical layer signature to a list of valid physical layer signatures at the UE. ### Claim 26 An apparatus for wireless communication at a network entity, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmit configuration information to a user equipment (UE) for at least one physical layer signal that is modified by a physical layer signature, the physical layer signature associated with a set of parameters that are applied to the physical layer signal; receive, from the UE, an indication of a mismatch between a set of estimated parameters of a received physical layer signature received at the UE and the set of parameters provided in the configuration information; and transmit, to the UE, an indication that the set of estimated parameters is associated with a valid physical layer signature or an invalid physical layer signature based at least in part on whether the set of estimated parameters corresponds to a neighboring physical layer signature of one or more neighboring network entities. ### Claim 27 (depends on 26) The apparatus of claim 26, wherein the instructions are further executable by the processor to cause the apparatus to: compare the set of estimated parameters to a plurality of valid sets of physical layer signature parameters, and wherein the indication that the set of estimated parameters is associated with an invalid physical layer signature is based at least in part on the estimated parameters being absent from the plurality of valid sets of physical layer parameters. ### Claim 28 (depends on 26) The apparatus of claim 26, wherein the set of estimated parameters of the received physical layer signature include one or more of an amplitude vector of an amplitude-to-amplitude modulation (AM/AM) physical layer signature applied to the received physical layer signal, a phase vector of an amplitude-to-phase modulation (AM/PM) physical layer signature applied to the received physical layer signal, a set of vectors of impulse responses of a frequency domain residual sideband (FDRSB) estimation of the received physical layer signal, or any combinations thereof. ### Claim 29 (depends on 26) The apparatus of claim 26, wherein the estimated physical layer signature parameters include an indication of a resource allocation associated with the received physical layer signature received at the UE. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the indication of the resource allocation associated with the received physical layer signature received at the UE includes one or more of a system frame number, a subframe number, a slot index, a symbol index, a bandwidth part (BWP), a resource block (RB) offset within the BWP, a number of RBs, a receive beam index, or any combinations thereof.