# US 11,909,697 B2 · Remote interference management reference signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,697 B2 - Document ID: US11909697B2 - Status: Granted - Kind: B2 - Application number: 17/947,767 - Filed: 2022-09-19 - Published: 2023-01-19 - Granted: 2024-02-20 - Earliest claimed: 2018-11-02 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Hassan Ghozlan; Qian Li; Dawei Ying; Geng Wu - Web page: https://patentgrep.com/patent/US11909697B2 ## CPC - H04L 5/1469: {using time-sharing} - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04J 11/0056: {Inter-base station aspects} - H04J 13/0029: {Gold} - H04J 13/0062: {Zadoff-Chu} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 27/2602: {Signal structure} - H04L 27/2613: {Structure of the reference signals} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - H04L 27/26132: {using repetition} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - 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) ## Abstract Systems, apparatuses, methods, and computer-readable media are provided for remote interference management (RIM) in wireless networks, including RIM reference signals (RIM-RS) transmitted to assist victim radio access network (RAN) nodes to identify aggressor RAN nodes due to, for example, atmospheric ducting. The RIM-RS is also flexibly configured. Other embodiments may be described and/or claimed. ## Claims ### Claim 1 A non-transitory computer-readable medium (CRM) having instructions that, when executed by one or more processors, causes a first radio access network (RAN) node to perform operations, the operations comprising: monitoring in a first time division duplex (TDD) interval and in a second TDD interval for a remote interference management-reference signal (RIM-RS) transmitted from a second RAN node, wherein the first TDD interval corresponds to a first set identifier (ID) used by the second RAN node and the second TDD interval corresponds to a second set ID used by the second RAN node; detecting the RIM-RS in the first TDD interval and not the second TDD interval; determining, based on detection of the RIM-RS in the first TDD interval and not the second TDD interval, that the second RAN node is operating according to the first set ID associated with a first transmitter of the second RAN node that transmitted the RIM-RS; and saving the first set ID in memory. ### Claim 2 (depends on 1) The non-transitory CRM of claim 1, wherein the operations further comprise determining a time location configured with respect to a switching point within a TDD downlink/uplink pattern. ### Claim 3 (depends on 1) The non-transitory CRM of claim 1, wherein the operations further comprise: providing an indication of the first set ID to a management node of a network. ### Claim 4 (depends on 1) The non-transitory CRM of claim 1, wherein the first TDD interval includes a plurality of RIM-RS transmission occasions. ### Claim 5 (depends on 4) The non-transitory CRM of claim 4, wherein the detecting the RIM-RS in the first TDD interval and not the second TDD interval further comprises detecting the RIM-RS in at least one of the plurality of RIM-RS transmission occasions of the first TDD interval. ### Claim 6 (depends on 1) The non-transitory CRM of claim 1, wherein the second set ID is associated with a second transmitter of the second RAN node. ### Claim 7 (depends on 1) The non-transitory CRM of claim 1, wherein the operations further comprise determining that the second RAN node causes remote interference in response to detecting the RIM-RS in the first TDD interval and not the second TDD interval. ### Claim 8 A method of operating a first radio access network (RAN) node, comprising: monitoring in a first time division duplex (TDD) interval and in a second TDD interval for a remote interference management-reference signal (RIM-RS) transmitted from a second RAN node, wherein the first TDD interval corresponds to a first set identifier (ID) used by the second RAN node and the second TDD interval corresponds to a second set ID used by the second RAN node; detecting the RIM-RS in the first TDD interval and not the second TDD interval; determining, based on detection of the RIM-RS in the first TDD interval and not the second TDD interval, that the second RAN node is operating according to the first set ID associated with a first transmitter of the second RAN node that transmitted the RIM-RS; and saving the first set ID in memory. ### Claim 9 (depends on 8) The method of claim 8, further comprising determining a time location configured with respect to a switching point within a TDD downlink/uplink pattern. ### Claim 10 (depends on 8) The method of claim 8, further comprising: providing an indication of the first set ID to a management node of a network. ### Claim 11 (depends on 8) The method of claim 8, wherein the first TDD interval includes a plurality of RIM-RS transmission occasions. ### Claim 12 (depends on 11) The method of claim 11, wherein the detecting the RIM-RS in the first TDD interval and not the second TDD interval further comprises detecting the RIM-RS in at least one of the plurality of RIM-RS transmission occasions of the first TDD interval. ### Claim 13 (depends on 8) The method of claim 8, wherein the second set ID is associated with a second transmitter of the second RAN node. ### Claim 14 (depends on 8) The method of claim 8, further comprising determining that the second RAN node causes remote interference in response to detecting the RIM-RS in the first TDD interval and not the second TDD interval. ### Claim 15 A first radio access network (RAN) node, comprising: radio front end circuitry configured to perform wireless communication over a wireless network; and processor circuitry, coupled to the radio front end circuitry, configured to: monitor in a first time division duplex (TDD) interval and in a second TDD interval for a remote interference management-reference signal (RIM-RS) transmitted from a second RAN node, wherein the first TDD interval corresponds to a first set identifier (ID) used by the second RAN node and the second TDD interval corresponds to a second set ID used by the second RAN node; detect the RIM-RS in the first TDD interval and not the second TDD interval; determine, based on the detection of the RIM-RS in the first TDD interval and not the second TDD interval, that the second RAN node is operating according to the first set ID associated with a first transmitter of the second RAN node that transmitted the RIM-RS; and save the first set ID in memory. ### Claim 16 (depends on 15) The first RAN node of claim 15, wherein the processor circuitry is further configured to determine a time location configured with respect to a switching point within a TDD downlink/uplink pattern. ### Claim 17 (depends on 15) The first RAN node of claim 15, wherein the processor circuitry is further configured to: provide an indication of the first set ID to a management node of a network. ### Claim 18 (depends on 15) The first RAN node of claim 15, wherein the first TDD interval includes a plurality of RIM-RS transmission occasions. ### Claim 19 (depends on 18) The first RAN node of claim 18, wherein to detect the RIM-RS in the first TDD interval and not the second TDD interval, the processor circuitry is further configured to detect the RIM-RS in at least one the plurality of RIM-RS transmission occasions of the first TDD interval. ### Claim 20 (depends on 15) The first RAN node of claim 15, wherein the second set ID is associated with a second transmitter of the second RAN node.