# US 12,225,530 B2 · Core network indication of radio access network action when redundancy is not available > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,530 B2 - Document ID: US12225530B2 - Status: Granted - Kind: B2 - Application number: 17/619,106 - Filed: 2020-06-17 - Published: 2022-08-25 - Granted: 2025-02-11 - Earliest claimed: 2019-06-17 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: György Miklós; Nianshan Shi; Paul Schliwa-Bertling - Web page: https://patentgrep.com/patent/US12225530B2 ## CPC - H04W 72/00: Local resource management - H04W 72/20: Control channels or signalling for resource management - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 92/12: between access points and access point controllers - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Systems and methods are disclosed herein that relate to actions performed by a Radio Access Network (RAN) when redundancy is not available. In this regard, embodiments of a method performed by a RAN node are disclosed. In one embodiment, a method performed by a RAN node for RAN action when redundancy is not available comprises receiving, from a core network node, a request for a set of User Plane (UP) resources in the RAN. The method further comprises determining whether the request for the set of UP resources in the RAN can be met and sending, to the core network node, a response to the request for the set of UP resources that is based on whether the request for the set of UP resources in the RAN can be met. ## Claims ### Claim 1 A method performed by a Radio Access Network, RAN, node for RAN action when redundancy is not available, the method comprising: receiving, from a core network node, a request for a set of User Plane, UP, resources in a RAN; determining whether the request for the set of UP resources in the RAN can be met; and sending, to the core network node, a response to the request for the set of UP resources that is based on whether the request for the set of UP resources in the RAN can be met. ### Claim 2 (depends on 1) The method of claim 1 wherein the request comprises an indication that the requested set of UP resources is required or preferred, and the response to the request for the set of UP resources is further based on the indication that the requested set of UP resources is required or preferred. ### Claim 3 (depends on 2) The method of claim 2 further comprising establishing or refraining from establishing the requested set of UP resources based on whether the request for the set of UP resources in the RAN can be met and the indication that the requested set of UP resources is required or preferred. ### Claim 4 (depends on 2) The method of claim 2 wherein: the indication is an indication that the requested set of UP resources is required; determining whether the request for the set of UP resources in the RAN can be met comprises determining that the request for the set of UP resources in the RAN cannot be met; and the response provides a negative acknowledgement. ### Claim 5 (depends on 2) The method of claim 2 wherein: the indication is an indication that the requested set of UP resources is required; determining whether the request for the set of UP resources in the RAN can be met comprises determining that the request for the set of UP resources in the RAN can be met; and the response comprises a positive acknowledgement. ### Claim 6 (depends on 2) The method of claim 2, wherein: the indication is an indication that the requested set of UP resources is preferred; determining whether the request for the set of UP resources in the RAN can be met comprises determining that the request for the set of UP resources in the RAN cannot be met; and the response comprises information that indicates that the requested set of UP resources could not be provided. ### Claim 7 (depends on 2) The method of claim 2, wherein: the indication is an indication that the requested set of UP resources is preferred; determining whether the request for the set of UP resources in the RAN can be met comprises determining that the RAN node is unable to determine whether the request for the set of UP resources in the RAN can be met; and the response provides a positive acknowledgement. ### Claim 8 (depends on 1) The method of claim 1, wherein the request further comprises an indication of whether to keep or release allocated UP resources when the request cannot be met for a given period of time. ### Claim 9 (depends on 8) The method of claim 8 wherein the given period of time to keep the allocated UP resources when the request cannot be met is different from the given period of time to release the allocated UP resources when the request cannot be met. ### Claim 10 (depends on 1) The method of claim 1, wherein the request further comprises an indication to establish the requested set of UP resources only if the requested set of UP resources can be established within a given period of time. ### Claim 11 (depends on 1) The method of claim 1, wherein the request further comprises an indication that the decision to keep or release an UP session depends upon the presence, absence, or status of another, different UP session. ### Claim 12 (depends on 1) The method of claim 1, wherein the request further identifies a period or interval during or at which the RAN should check availability or unavailability of the requested set of UP resources. ### Claim 13 A method performed by a network node in a core network of a cellular communications system for indication of a Radio Access Network, RAN, action when redundancy is not available, the method comprising: sending, to a RAN node, a request for a set of User Plane, UP, resources in the RAN, the request comprising an indication that the requested set of UP resources is required or preferred; and receiving, from the RAN node, a response to the request for the set of UP resources that is based on whether the request for the set of UP resources in the RAN can be met. ### Claim 14 (depends on 13) The method of claim 13 wherein: the request identifies a Protocol Data Unit, PDU, session; the set of UP resources is a set of UP resources for the PDU session; and the indication that the requested set of UP resources is required or preferred is provided for the PDU session on a per-PDU-session granularity. ### Claim 15 (depends on 14) The method of claim 14, wherein the request further comprises a Redundancy Sequence Number, RSN, that indicates whether the PDU session is one of two or more redundant PDU sessions. ### Claim 16 (depends on 14) The method of claim 14, wherein the indication is an indication that the requested set of UP resources is required. ### Claim 17 (depends on 16) The method of claim 16, wherein the indication that the requested set of UP resources is required indicates that the PDU session should be created if the requested set of UP resources is available but released if the set of UP resources subsequently becomes unavailable. ### Claim 18 (depends on 14) The method of claim 14, wherein the indication is an indication that the set of UP resources is preferred. ### Claim 19 (depends on 18) The method of claim 18, wherein the indication that the set of UP resources is preferred indicates that the PDU session should be created even if the requested set of UP resources is not available. ### Claim 20 (depends on 18) The method of claim 18, wherein the indication that the set of UP resources is preferred indicates that the PDU session should use the requested set of UP resources if the requested set of UP resources subsequently becomes unavailable.