# US 12,604,366 B2 · Multicast service delivery for use in inactive state > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,366 B2 - Document ID: US12604366B2 - Status: Granted - Kind: B2 - Application number: 18/121,082 - Filed: 2023-03-14 - Published: 2023-10-12 - Granted: 2026-04-14 - Earliest claimed: 2022-03-18 - Applicants: Parsa Wireless Communications LLC - Inventors: Alireza Babaei - Web page: https://patentgrep.com/patent/US12604366B2 ## CPC - H04W 76/40: for selective distribution or broadcast - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 72/115: Grant-free or autonomous transmission - H04W 72/30: Resource management for broadcast services - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0836: with 2-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method of multicast data delivery in a radio resource control (RRC) inactive state includes receiving, by a user equipment (UE) in an RRC connected state, an RRC release message indicating transitioning of the UE from the RRC connected state to an RRC inactive state and receiving, while in the RRC inactive state, multicast data in response to joining a multicast group and receiving multicast configuration parameters. ## Claims ### Claim 1 A method of multicast data delivery in a radio resource control (RRC) inactive state, comprising the steps of: receiving, by a user equipment (UE) in an RRC connected state, an RRC release message indicating transitioning of the UE from the RRC connected state to an RRC inactive state; and receiving, while in the RRC inactive state, multicast data in response to joining a multicast group and receiving multicast configuration parameters, wherein the multicast configuration parameters are conveyed in the RRC release message and comprise a first set of parameters for multicast reception in the RRC connected state and a second set of parameters for multicast reception in the RRC inactive state, the second set of parameters including paging occasion information and semi-persistent scheduling information for multicast reception in the RRC inactive state. ### Claim 2 (depends on 1) The method of claim 1, further comprising, while in the radio resource control (RRC) connected state and before receiving the RRC release message, the user equipment (UE): joining the multicast group; and receiving the multicast configuration parameters. ### Claim 3 (depends on 1) The method of claim 1, wherein the multicast configuration parameters comprise first multicast configuration parameters for multicast data reception during the radio resource control (RRC) connected state and second multicast configuration parameters for multicast data reception during the radio resource control (RRC) inactive state. ### Claim 4 (depends on 1) The method of claim 1, further comprising, while in the radio resource control (RRC) inactive state and after receiving the RRC release message, the user equipment (UE): joining the multicast group; or receiving the multicast configuration parameters; or both. ### Claim 5 (depends on 4) The method of claim 4, wherein: joining the multicast group occurs while the user equipment (UE) in the radio resource control (RRC) inactive state; and the UE receiving the multicast configuration parameters after transitioning to the RRC connected state. ### Claim 6 (depends on 4) The method of claim 4, wherein joining the multicast group, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on a random access process. ### Claim 7 (depends on 6) The method of claim 6, wherein joining the multicast group via a message A (MsgA) of a two-step random access process or a message 3 (Msg3) of a four-step random access process. ### Claim 8 (depends on 6) The method of claim 6, wherein the radio resource control (RRC) release message comprises one or more configuration parameters for the random access process. ### Claim 9 (depends on 6) The method of claim 6, wherein receiving the multicast configuration parameters, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on the random access process. ### Claim 10 (depends on 4) The method of claim 4, wherein receiving the multicast configuration parameters, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on a pre-configured downlink assignment in the RRC inactive state. ### Claim 11 (depends on 10) The method of claim 10, further comprising the user equipment (UE) receiving a downlink transport block, comprising the multicast configuration parameters, based on the pre-configured downlink assignment. ### Claim 12 (depends on 4) The method of claim 4, wherein receiving the multicast configuration parameters, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on a semi-persistent scheduling (SPS) downlink assignment in the RRC inactive state. ### Claim 13 (depends on 12) The method of claim 12, wherein the radio resource control (RRC) release message comprises semi-persistent scheduling (SPS) configuration parameters. ### Claim 14 (depends on 13) The method of claim 13, further comprising determining the semi-persistent scheduling (SPS) downlink assignment based on the SPS configuration parameters. ### Claim 15 A method of multicast data delivery in a radio resource control (RRC) inactive state, comprising the steps of: receiving, by a user equipment (UE) in an RRC connected state, an RRC release message indicating transitioning of the UE from the RRC connected state to an RRC inactive state; and receiving, while in the RRC inactive state, multicast data in response to joining a multicast group and receiving multicast configuration parameters; wherein, while in the radio resource control (RRC) inactive state and after receiving the RRC release message, the user equipment (UE): joining the multicast group; or receiving the multicast configuration parameters, or both: wherein joining the multicast group, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on a random access process, wherein receiving the multicast configuration parameters, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on the random access process, and wherein receiving the multicast configuration parameters, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on a message B (MsgB) of a two-step random access process or a message 4 (Msg4) of a four-step random access process. ### Claim 16 A method of multicast data delivery in a radio resource control (RRC) inactive state, comprising the steps of: receiving, by a user equipment (UE) in an RRC connected state, an RRC release message indicating transitioning of the UE from the RRC connected state to an RRC inactive state; and receiving, while in the RRC inactive state, multicast data in response to joining a multicast group and receiving multicast configuration parameters; wherein, while in the radio resource control (RRC) inactive state and after receiving the RRC release message, the user equipment (UE): joining the multicast group; or receiving the multicast configuration parameters; or both; and wherein joining the multicast group, while the user equipment (UE) is in the radio resource control (RRC) inactive state, occurs based on a configured grant. ### Claim 17 (depends on 16) The method of claim 16, further comprising transmitting a transport block, via radio resources of the configured grant, the transport block indicating the request to join the multicast group. ### Claim 18 (depends on 16) The method of claim 16, wherein the radio resource control (RRC) release message comprises configured grant configuration parameters. ### Claim 19 (depends on 18) The method of claim 18, further comprising determining the configured grant based on the configured grant configuration parameters. ### Claim 20 A method of multicast data delivery in a radio resource control (RRC) inactive state, comprising the steps of: receiving, by a user equipment (UE) in an RRC connected state, an RRC release message indicating transitioning of the UE from the RRC connected state to an RRC inactive state the RRC release message further conveying multicast configuration parameters; and in response to joining a multicast group, determining a bandwidth part (BWP) for reception of paging information and multicast data during the RRC inactive state based on the multicast configuration parameters conveyed in the RRC release message, the multicast configuration parameters including paging occasion information and semi-persistent scheduling information for multicast reception in the RRC inactive state; and receiving the paging information and the multicast data via the determined BWP.