# US 12,224,849 B2 · Method for conveying remote interference management information via reference signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,849 B2 - Document ID: US12224849B2 - Status: Granted - Kind: B2 - Application number: 17/421,645 - Filed: 2020-01-11 - Published: 2022-04-28 - Granted: 2025-02-11 - Earliest claimed: 2019-01-11 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Hassan Ghozlan; Dawei Ying; Qian Li; Geng Wu - Web page: https://patentgrep.com/patent/US12224849B2 ## CPC - H04J 11/005: {of intercell interference} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04B 17/382: for resource allocation, admission control or handover - H04L 5/0073: {Allocation arrangements that take into account other cell interferences} - H04W 24/02: Arrangements for optimising operational condition - H04W 88/08: Access point devices - H04W 92/20: between access points - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - 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 The present disclosure is directed to systems and methods for conveying remote interference management information via a reference signal. For example, an interference management method may include receiving, at a first device, an interference signal from a second device. At the first device, a reference signal is generated, including mitigation information for remote interference management. The first device may transmit the reference signal to the second device. The method may further include receiving, at the first device, a mitigation response signal indicative of a level of mitigation undertaken by the second device based on the mitigation information that the first device transmitted. ## Claims ### Claim 1 A method for remote interference management, the method comprising: receiving, at a first device, an interference signal from a second device; generating, at the first device, a reference signal including mitigation information for the remote interference management; transmitting, by the first device, the reference signal to the second device; and receiving, at the first device, a mitigation response signal indicative of a level of mitigation undertaken by the second device based on the mitigation information, the level of mitigation undertaken by the second device being based upon a number of symbols impacted by the interference signal that is estimated based upon an estimated length of a propagation delay experienced by the reference signal being transmitted by the first device and received at the second device. ### Claim 2 (depends on 1) The method of claim 1, wherein the interference signal is associated with an atmospheric duct, and wherein the interference signal is received from a group of base stations that comprise the second device. ### Claim 3 (depends on 1) The method of claim 1, further comprising: encoding, by the first device, the mitigation information into a time index message, a frequency index message, and a sequence index message using mapping rules; and transmitting the encoded mitigation information within the reference signal to the second device. ### Claim 4 (depends on 3) The method of claim 3, wherein the mapping rules define a device indication corresponding to whether each of the first device and the second device is an interfering device or a victim device, a mitigation sufficiency indication corresponding to the level of mitigation, and a device identification. ### Claim 5 (depends on 1) The method of claim 1, further comprising: encoding, by the first device, the mitigation information using mapping rules that define a victim/aggressor status, a mitigation sufficiency indication corresponding to the level of mitigation, and a device identification. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving, at the first device, an adjusted transmit power from the second device in response to the transmitted reference signal. ### Claim 7 (depends on 1) The method of claim 1, wherein the reference signal further includes a reference time offset corresponding to a distance range away from the first device at which the second device is located. ### Claim 8 (depends on 7) The method of claim 7, wherein the reference signal further includes a reference time offset pattern corresponding to predetermined reference time offsets, the reference time offset pattern being used by the first device and the second device at different reference signal transmission periods based on the distance range. ### Claim 9 A method for remote interference management, the method comprising: receiving, at a second device, a reference signal from a first device, the reference signal being related to an interference signal received at the first device and including mitigation information for the remote interference management; performing, by the second device, a mitigation based on the mitigation information, the performing comprising estimating a length of a propagation delay between the first device and the second device to estimate a number of symbols impacted by the interference signal, a level of the mitigation performed being based upon the number of symbols impacted by the interference signal that is estimated based upon the estimated length of the propagation delay; and transmitting, by the second device, a mitigation response signal to the first device, the mitigation response signal indicating the level of the mitigation undertaken by the second device based on the mitigation information. ### Claim 10 (depends on 9) The method of claim 9, wherein the interference signal is associated with an atmospheric duct, and wherein the interference signal is transmitted from a group of base stations that comprise the second device. ### Claim 11 (depends on 9) The method of claim 9, further comprising decoding, by the second device, a time index message, a frequency index message, or a sequence index message encoded in the mitigation information by the first device, the decoding using mapping rules used by the first device. ### Claim 12 (depends on 11) The method of claim 11, wherein the mapping rules define a device indication corresponding to whether each of the first device and the second device is an interfering device or a victim device, a mitigation sufficiency indication corresponding to the level of the mitigation, and a device identification. ### Claim 13 (depends on 9) The method of claim 9, wherein the performing the mitigation further comprises adjusting a transmit power of the second device. ### Claim 14 (depends on 9) The method of claim 9, further comprising: decoding, by the second device, a first portion of the mitigation information encoded by the first device using mapping rules used by the first device; and decoding, by the second device, a second portion of the mitigation information by retrieving information corresponding to the second portion from a lookup repository. ### Claim 15 A first device, comprising: a processor; and a memory that stores instructions that, when executed by the processor, cause the processor to: receive an interference signal from a second device, generate, in response to the interference signal, a reference signal including mitigation information for remote interference management to be performed at the second device, transmit the reference signal to the second device, and receive a mitigation response signal indicative of a level of mitigation undertaken by the second device based on the mitigation information, the level of mitigation undertaken by the second device being based upon a number of symbols impacted by the interference signal that is estimated based upon an estimated length of a propagation delay experienced by the reference signal being transmitted by the first device and received at the second device. ### Claim 16 (depends on 15) The first device of claim 15, wherein the interference signal is due to an atmospheric duct, and wherein the interference signal is received from a group of base stations that comprise the second device. ### Claim 17 (depends on 15) The first device of claim 15, wherein the processor is further configured to: encode the mitigation information into a time index message, a frequency index message, and a sequence index message using mapping rules, and transmit the reference signal including the encoded mitigation information to the second device. ### Claim 18 (depends on 17) The first device of claim 17, wherein the mapping rules define a device indication corresponding to whether each of the first device and the second device is an interfering device or a victim device, a mitigation sufficiency indication corresponding to the level of mitigation, and a device identification. ### Claim 19 (depends on 15) The first device of claim 15, wherein the processor is further configured to: encode the mitigation information using mapping rules that define a victim/aggressor status and a mitigation sufficiency indication of the level of mitigation, and a device identification, and transmit the reference signal including the encoded mitigation information to the second device. ### Claim 20 (depends on 15) The first device of claim 15, wherein the processor is further configured to receive an adjusted transmit power in response to the transmitted reference signal.