# US 10,484,931 B2 · Licensed assisted access radio link failure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,931 B2 - Document ID: US10484931B2 - Status: Granted - Kind: B2 - Application number: 15/854,342 - Filed: 2017-12-26 - Published: 2018-06-28 - Granted: 2019-11-19 - Earliest claimed: 2016-12-23 - Assignees: Ofinno, LLC - Applicants: Esmael Hejazi Dinan - Inventors: Esmael Hejazi Dinan - Web page: https://patentgrep.com/patent/US10484931B2 ## CPC - H04W 48/10: using broadcasted information - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 48/12: using downlink control channel - H04W 48/16: Discovering, processing access restriction or access information - H04W 76/18: Management of setup rejection or failure - H04W 48/06: based on traffic conditions - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A wireless device receives from a first base station, configuration parameters of a plurality of cells. The configuration parameters comprise a first cell group comprising one or more first cells for communication with the first base station, and a second cell group comprising a licensed assisted access (LAA) cell for communication with a second base station. The wireless device receives from the second base station LAA cell signals in a subframe of a plurality of subframes of the LAA cell. The wireless device determines whether the subframe is considered for radio link failure (RLF) detection based on processing the LAA cell signals. The wireless device increments a counter in response to the subframe of the LAA cell being considered for RLF detection, and the wireless device not successfully decoding a control channel in the subframe of the LAA cell. The wireless device detects an RLF based on the counter. ## Claims ### Claim 1 A method comprising: receiving, by a wireless device from a first base station, configuration parameters of a plurality of cells comprising: a first cell group comprising one or more first cells for communication with the first base station; and a second cell group comprising a licensed assisted access (LAA) cell for communication with a second base station; receiving, by the wireless device from the second base station, LAA cell signals in a subframe of a plurality of subframes of the LAA cell; determining, by the wireless device, whether the subframe is considered for radio link failure (RLF) detection based on processing the LAA cell signals; incrementing, by the wireless device, a counter in response to: the subframe of the LAA cell being considered for RLF detection; and the wireless device not successfully decoding a control channel in the subframe of the LAA cell; detecting an RLF based on the counter; and transmitting, by the wireless device to the first base station, a first message indicating the RLF. ### Claim 2 (depends on 1) The method of claim 1, further comprising starting, by the wireless device, a timer in response to the counter reaching a first number. ### Claim 3 (depends on 2) The method of claim 2, wherein the configuration parameters comprise the first number. ### Claim 4 (depends on 2) The method of claim 2, wherein detecting the RLF is in response to: the timer expiring; and the wireless device not successfully decoding a control channel for a second number of times while the timer is running. ### Claim 5 (depends on 4) The method of claim 4, wherein the configuration parameters comprise: a first parameter indicating a timer value for the timer; and a second parameter indicating the second number. ### Claim 6 (depends on 1) The method of claim 1, further comprising transmitting, by the wireless device to the first base station, a radio resource control connection reestablishment request message. ### Claim 7 (depends on 1) The method of claim 1, further comprising the wireless device releasing one or more uplink transmission configurations. ### Claim 8 (depends on 1) The method of claim 1, wherein successfully decoding of the control channel is based on a reference signal received power. ### Claim 9 (depends on 1) The method of claim 1, wherein the LAA cell is a primary secondary cell. ### Claim 10 (depends on 1) The method of claim 1, wherein the LAA cell signals comprise one or more reference signals. ### Claim 11 A wireless device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to: receive from a first base station, configuration parameters of a plurality of cells comprising: a first cell group comprising one or more first cells for communication with the first base station; and a second cell group comprising a licensed assisted access (LAA) cell for communication with a second base station; receive from the second base station, LAA cell signals in a subframe of a plurality of subframes of the LAA cell; determine whether the subframe is considered for radio link failure (RLF) detection based on processing the LAA cell signals; increment a counter in response to: the subframe of the LAA cell being considered for RLF detection; and the wireless device not successfully decoding a control channel in the subframe of the LAA cell; detect an RLF based on the counter; and transmit to the first base station, a first message indicating the RLF. ### Claim 12 (depends on 11) The wireless device of claim 11, wherein the instructions, when executed by the one or more processors, further cause the wireless device to start a timer in response to the counter reaching a first number. ### Claim 13 (depends on 12) The wireless device of claim 12, wherein the configuration parameters comprise the first number. ### Claim 14 (depends on 12) The wireless device of claim 12, wherein detecting the RLF is in response to: the timer expiring; and the wireless device not successfully decoding a control channel for a second number of times while the timer is running. ### Claim 15 (depends on 14) The wireless device of claim 14, wherein the configuration parameters comprise: a first parameter indicating a timer value for the timer; and a second parameter indicating the second number. ### Claim 16 (depends on 11) The wireless device of claim 11, wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit to the first base station, a radio resource control connection reestablishment request message. ### Claim 17 (depends on 11) The wireless device of claim 11, wherein the instructions, when executed by the one or more processors, further cause the wireless device to release one or more uplink transmission configurations. ### Claim 18 (depends on 11) The wireless device of claim 11, wherein successfully decoding of the control channel is based on a reference signal received power. ### Claim 19 (depends on 11) The wireless device of claim 11, wherein the LAA cell is a primary secondary cell. ### Claim 20 (depends on 11) The wireless device of claim 11, wherein the LAA cell signals comprise one or more reference signals.