# US 2019/0173626 A1 · Inter-Radio Access Technology Carrier Aggregation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173626 A1 - Document ID: US20190173626A1 - Status: Published application - Kind: A1 - Application number: 15/832,395 - Filed: 2017-12-05 - Published: 2019-06-06 - Earliest claimed: 2017-12-05 - Assignees: Google Inc. - Applicants: Google LLC - Inventors: Jibing Wang; Erik Richard Stauffer; Aamir Akram - Web page: https://patentgrep.com/patent/US20190173626A1 ## CPC - H04L 1/201: {Frame classification, e.g. bad, good or erased (frame indication per se H04L1/0082)} - H04L 1/1867: Arrangements specially adapted for the transmitter end - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0096: {Indication of changes in allocation} - H04L 25/067: {providing soft decisions, i.e. decisions together with an estimate of reliability (H04L25/068 and H04L25/069 take precedence; sequence estimation techniques H04L25/03178)} - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - H04L 1/0025: {Transmission of mode-switching indication} - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0085: {when channel conditions change} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure describes methods and apparatuses for inter-radio access technology carrier aggregation. In some aspects, a user device establishes a wireless link for communicating with a base station via a first radio access technology. The user device receives an inter-radio access technology carrier aggregation communication via the wireless link in accordance with the first radio access technology. The inter-radio access technology carrier aggregation communication includes data relating to a component carrier of the wireless link that uses a second radio access technology. The user device may use the data to configure the user device for communication via the second component carrier of the wireless link. ## Claims ### Claim 1 A method performed by a user device, the method comprising: establishing, via a transceiver of the user device, a wireless link with a first base station via a first radio access technology (RAT); transmitting, to the first base station via the first RAT, a message indicating that the user device supports communication via a second RAT, the second RAT being different from the first RAT; receiving, from the first base station via the first RAT, an inter-RAT carrier aggregation communication that provides data related to a component carrier of the second RAT; configuring, based at least in part on the inter-RAT carrier aggregation communication, the transceiver of the user device for communicating via a component carrier of the first RAT; configuring, based at least in part on the inter-RAT carrier aggregation communication, the transceiver of the user device for communicating via the component carrier of the second RAT; and communicating, via the configured transceiver, data with both the first base station via the first component carrier of the first RAT and a second base station via the second component carrier of the second RAT. ### Claim 2 (depends on 1) The method as recited in claim 1, wherein the second component carrier is configured for communication with the second base station via a downlink only. ### Claim 3 (depends on 1) The method as recited in claim 1, wherein: the first RAT is a Long Term Evolution (LTE) RAT and the second RAT is a 5th generation (5G) new radio (NR) RAT; or the first RAT is a 5G NR RAT and the second RAT is an LTE RAT. ### Claim 4 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication received via the first RAT includes a timing advance usable by the user device to configure transmission timing for communication via the second component carrier of the second RAT. ### Claim 5 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication received via the first RAT includes a power control command usable by the user device to adjust a power amplification for transmitting via the second component carrier of the second RAT. ### Claim 6 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication is received by the user device via a physical random access channel (PRACH) configuration message and is usable by the user device to configure the user device to establish another PRACH with the second component carrier of the second RAT. ### Claim 7 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication includes an indication that the first base station supports aggregation communications for the first component carrier of the first RAT and the second component carrier of the second RAT. ### Claim 8 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication includes handover data usable by the user device to transfer the second component carrier from the second base station to another base station. ### Claim 9 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication is received by the user device as part of a carrier identification field (CIF) of the first component carrier of the first RAT. ### Claim 10 (depends on 1) The method as recited in claim 1, wherein the inter-RAT carrier aggregation communication is received by the user device as part of a radio resource control (RRC) communication of the first component carrier of the first RAT. ### Claim 11 A user device comprising: a hardware-based transceiver; and an inter-radio access technology carrier aggregation (Inter-RAT CA) module configured to perform operations comprising: establishing, via the transceiver of the user device, a wireless link with one or more base stations, the wireless link including: a first component carrier of a first radio access technology (RAT); and a second component carrier of a second RAT, the second RAT being different from the first RAT; receiving, from the one or more base stations and via the first component carrier of the first RAT, an inter-RAT carrier aggregation communication, the inter-RAT carrier aggregation communication providing data relating to the second component carrier of the second RAT; and altering, in response to receiving the inter-RAT carrier aggregation communication, a configuration of the second component carrier of the second RAT. ### Claim 12 (depends on 11) The user device as recited in claim 11, wherein the second component carrier of the second RAT supports a greater downlink bandwidth than a downlink bandwidth supported by the first component carrier of the first RAT. ### Claim 13 (depends on 11) The device as recited in claim 11, wherein the inter-RAT carrier aggregation communication includes a deactivation message instructing the user device to deactivate the second component carrier of the second RAT. ### Claim 14 (depends on 11) The device as recited in claim 11, wherein the operations further include transmitting a buffer status report via the first component carrier of the first RAT, the buffer status report including a status of data to be transmitted via the second component carrier of the second RAT. ### Claim 15 A method performed by a base station of a wireless network, the method comprising: establishing, via a transceiver of the base station, a wireless link for communicating with a user device, the wireless link including a first component carrier of a first radio access technology (RAT) facilitating communication between the base station and the user device; determining that the user device supports a second component carrier of a second RAT; receiving, from another device of the wireless network, data relating to the second component carrier of the second RAT; and transmitting, to the user device via the first component carrier of the first RAT, an inter-RAT carrier aggregation communication providing at least a portion of the data relating to the second component carrier of the second RAT, the portion of the data usable by the user device to configure a transceiver of the user device for future communication via the second component carrier of the second RAT. ### Claim 16 (depends on 15) The method as recited in claim 15, wherein the inter-RAT carrier aggregation communication includes a measurement report configuration usable by the user device to transmit a measurement report via the wireless link, the measurement report including signal quality data for the second component carrier of the second RAT. ### Claim 17 (depends on 16) The method as recited in claim 16, wherein the measurement report configuration is usable by the user device to transmit the measurement report via the first component carrier of the second RAT. ### Claim 18 (depends on 15) The method as recited in claim 15, wherein the inter-RAT carrier aggregation communication is transmitted to the user device as part of a radio resource control (RRC) connection reconfiguration. ### Claim 19 (depends on 18) The method as recited in claim 18, wherein the RRC connection reconfiguration is usable by the user device to terminate the other wireless link. ### Claim 20 (depends on 15) The method as recited in claim 15, wherein the inter-RAT carrier aggregation communication includes an RRC message usable by the user device to configure a maximum power amplification for communicating via the other wireless link.