# US 11,445,563 B2 · Secondary cell link recovery request transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,563 B2 - Document ID: US11445563B2 - Status: Granted - Kind: B2 - Application number: 16/931,254 - Filed: 2020-07-16 - Published: 2021-04-01 - Granted: 2022-09-13 - Earliest claimed: 2019-09-27 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Yushu Zhang; Dawei Zhang; Haijing Hu; Haitong Sun; Hong He; Wei Zeng; Yakun Sun; Yuchul Kim - Web page: https://patentgrep.com/patent/US11445563B2 ## CPC - H04W 76/18: Management of setup rejection or failure - H04W 8/24: Transfer of terminal data - H04W 72/1268: of uplink data flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 76/19: Connection re-establishment - H04W 74/0836: with 2-step access - H04W 76/15: Setup of multiple wireless link connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments are presented herein of apparatuses, systems, and methods for a user equipment device (UE) to transmit an indication of a link failure on a secondary cell. The indication may be transmitted on resources selected based on one or more conditions. One or more priority rules may be used to resolve collisions. The UE may further make an assumption of a beam or beams to use for communications with the secondary cell following the link failure and prior to receiving an indication from the network of a selected beam. ## Claims ### Claim 1 A user equipment device (UE), comprising: a radio; and a processor operably coupled to the radio and configured to cause the UE to: establish a connection with a cellular network, wherein the connection includes: a link to a primary cell (PCell); and a link to a secondary cell (SCell); determine a failure of the link to the SCell; receive configuration for a first opportunity for transmission of a link recovery message on a physical uplink control channel (PUCCH); determine at least one condition for early transmission, prior to the first opportunity, of an indication of the failure of the link to the SCell; and transmit, to the cellular network, the indication, wherein the indication is transmitted prior to the first opportunity in response to the determination of the at least one condition, wherein the indication is transmitted using a medium access control (MAC) control element (MAC CE) on a physical uplink shared channel (PUSCH). ### Claim 2 (depends on 1) The UE of claim 1, wherein the at least one condition includes a detection of an uplink grant, wherein the indication of the failure of the link to the SCell is transmitted on resources allocated by the uplink grant. ### Claim 3 (depends on 1) The UE of claim 1, wherein the at least one condition includes that the UE is allocated resources by a configured grant, wherein the indication is transmitted on the resources allocated by the configured grant. ### Claim 4 (depends on 3) The UE of claim 3, wherein the at least one condition further includes that the resources allocated by the configured grant are before the first opportunity. ### Claim 5 (depends on 1) The UE of claim 1, wherein the at least one condition includes that the UE is configured for 2-step random access, wherein transmitting the indication includes transmitting a random access request. ### Claim 6 (depends on 5) The UE of claim 5, wherein the at least one condition further includes that resources for 2-step random access are before the first opportunity. ### Claim 7 (depends on 1) The UE of claim 1, wherein the indication is not transmitted on the first opportunity in response to the determination of the at least one condition. ### Claim 8 An apparatus, comprising: a processor configured to cause a user equipment device (UE) to: establish a connection with a secondary cell (SCell) of a cellular network; receive configuration for a first opportunity for transmission of a link recovery message on a physical uplink control channel (PUCCH); determine that the connection with the SCell has failed; determine at least one condition for early transmission, prior to the first opportunity, of an indication that the connection with the SCell has failed; and transmit, to the cellular network prior to the first opportunity, the indication using a medium access control (MAC) control element (MAC CE) on a physical uplink shared channel (PUSCH). ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the indication that the connection with the SCell has failed includes an indication of a suggested beam for further communications with the SCell, wherein the processor is further configured to cause the UE to: receive, from the cellular network, a response to the indication that the connection with the SCell has failed; select a second beam for a first further communication with the SCell, wherein the second beam is the suggested beam; perform the first further communication with the SCell using the second beam prior to receiving an indication from the cellular network of a selected beam; receive, from the cellular network, the indication of the selected beam, wherein the selected beam is a third beam different from the second beam; and use the third beam for a second further communication with the SCell, wherein the second further communication with the SCell is subsequent to the first further communication with the SCell. ### Claim 10 (depends on 8) The apparatus of claim 8, wherein the indication that the connection with the SCell has failed includes an indication of a suggested beam for further communications with the SCell, wherein the processor is further configured to cause the UE to: receive, from the cellular network, a response to the indication that the connection with the SCell has failed; select a second beam for a first further communication with the SCell, wherein the second beam is the suggested beam; and perform the first further communication with the SCell using the second beam prior to receiving an indication from the cellular network of a selected beam, wherein the second beam is used only for the SCell. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the indication that the connection with the SCell has failed includes an indication of a suggested beam for further communications with the SCell, wherein the processor is further configured to cause the UE to: receive, from the cellular network, a response to the indication that the connection with the SCell has failed; select a second beam for a first further communication with the SCell, wherein the second beam is the suggested beam; and perform the first further communication with the SCell using the second beam prior to receiving an indication from the cellular network of a selected beam, wherein the second beam is used for all serving cells operating in a same band as the SCell. ### Claim 12 (depends on 8) The apparatus of claim 8, wherein the indication that the connection with the SCell has failed includes an indication of a suggested beam for further communications with the SCell, wherein the processor is further configured to cause the UE to: receive, from the cellular network, a response to the indication that the connection with the SCell has failed; select a second beam for a first further communication with the SCell, wherein the second beam is the suggested beam; and perform the first further communication with the SCell using the second beam prior to receiving an indication from the cellular network of a selected beam, wherein the first further communication occurs at least K slots after receiving the response to the indication that the connection with the SCell has failed. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein K is based on an indication received from the cellular network via radio resource control signaling. ### Claim 14 (depends on 12) The apparatus of claim 12, wherein K is based on a capability of the UE. ### Claim 15 A method, comprising: at a user equipment device (UE): establishing a connection with a cellular network, wherein the connection includes: a link to a primary cell (PCell); and a link to a secondary cell (SCell); receiving configuration for a first opportunity for transmission of a link recovery message on a physical uplink control channel (PUCCH); determining a failure of the link to the SCell; determining at least one condition for early transmission, prior to the first opportunity, of an indication of the failure of the link to the SCell; and transmitting, to the cellular network, the indication, wherein the indication is transmitted prior to the first opportunity in response to the determination of the at least one condition, wherein the indication is transmitted using a medium access control (MAC) control element (MAC CE) on a physical uplink shared channel (PUSCH). ### Claim 16 (depends on 15) The method of claim 15, wherein the at least one condition includes a detection of an uplink grant, wherein the indication of the failure of the link to the SCell is transmitted on resources allocated by the uplink grant. ### Claim 17 (depends on 15) The method of claim 15, wherein the at least one condition includes that the UE is allocated resources by a configured grant, wherein the indication is transmitted on the resources allocated by the configured grant. ### Claim 18 (depends on 17) The method of claim 17, wherein the at least one condition further includes that the resources allocated by the configured grant are before the first opportunity. ### Claim 19 (depends on 15) The method of claim 15, wherein the at least one condition includes that the UE is configured for 2-step random access, wherein transmitting the indication includes transmitting a random access request. ### Claim 20 (depends on 15) The method of claim 15, wherein the indication is not transmitted on the first opportunity in response to the determination of the at least one condition.