# US 2018/0324803 A1 · Method, System, and Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324803 A1 - Document ID: US20180324803A1 - Status: Published application - Kind: A1 - Application number: 15/773,200 - Filed: 2016-10-13 - Published: 2018-11-08 - Earliest claimed: 2015-11-06 - Assignees: Nokia Solutions and Networks Oy - Applicants: Nokia Solutions and Networks Oy - Inventors: Claudio ROSA; Frank FREDERIKSEN; Kari Juhani HOOLI; Esa Tapani TIIROLA; Klaus HUGL - Web page: https://patentgrep.com/patent/US20180324803A1 ## CPC - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04L 5/001: {the frequencies being arranged in component carriers} - H04W 74/002: {Transmission of channel access control information} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 74/0833: Random access procedures, e.g. with 4-step access - 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 There is provided a method including receiving information at a user device capable of operating using carrier aggregation, said information including an indication of a first carrier and at least one second carrier to be used for a signalling procedure, causing transmission from the user device of a first signal of the signalling procedure using at least one of the first carrier and the at least one second carrier and monitoring the first carrier and the at least one second carrier for transmission of a second signal of the signalling procedure from an access point. ## Claims ### Claim 1 A method comprising: receiving information at a user device capable of operating using carrier aggregation, said information comprising an indication of a first carrier and at least one second carrier to be used for a signalling procedure; causing transmission from the user device of a first signal of the signalling procedure using at least one of the first carrier and the at least one second carrier; and monitoring the first carrier and the at least one second carrier for transmission of a second signal of the signalling procedure from an access point. ### Claim 2 (depends on 1) A method according to claim 1, wherein causing transmission from the user device of a first signal of the signalling procedure using at least one of the first carrier and the at least one second carrier comprises determining using at least one of the first carrier and the at least one second carrier in dependence on a listen-before-talk procedure performed on at least one of the first carrier and the at least one second carrier. ### Claim 3 (depends on 1) A method according to claim 1, wherein the signalling procedure is a random access channel procedure. ### Claim 4 (depends on 3) A method according to claim 3, wherein the first signal is a random access preamble and the second signal is a random access response. ### Claim 5 (depends on 4) A method according to claim 4, wherein the random access preamble comprises an indication of whether the user device is capable of operating using uplink carrier aggregation. ### Claim 6 (depends on 4) A method according to claim 4, wherein the random access response includes a random access radio network temporary identifier, the random access radio network temporary identifier comprising an indication of the one of the first carrier and the at least one second carrier on which the first signal was caused to be transmitted. ### Claim 7 (depends on 3) A method according to claim 3, comprising: causing transmission from the user device of a third signal of the signalling procedure using the one of the first carrier and the at least one second carrier on which the first signal was received. ### Claim 8 (depends on 3) A method according to claim 3, comprising causing transmission from the user device of a third signal of the signalling procedure using at least one of the first carrier and the at least one second carrier in dependence on a listen-before-talk procedure performed on at least one of the first carrier and the at least one second carrier. ### Claim at position 9 9-14. (canceled) ### Claim 15 A method comprising: providing information to a user device capable of operating using carrier aggregation, said information comprising an indication of a first carrier and at least one second carrier to be used for a signalling procedure; receiving a transmission from the user device of a first signal of the signalling procedure using at least one of the first carrier and the at least one second carrier; and causing transmission of a second signal of the signalling procedure from an access point using at least one of the first carrier and the at least one second carrier. ### Claim 16 (depends on 15) A method according to claim 15, wherein causing transmission of the second signal of the signalling procedure using at least one of the first carrier and the at least one second carrier comprises determining using at least one of the first carrier and the at least one second carrier in dependence on a listen-before-talk procedure performed on at least one of the first carrier and the at least one second carrier. ### Claim 17 (depends on 15) A method according to claim 15, wherein the signalling procedure is a random access channel procedure. ### Claim 18 (depends on 17) A method according to claim 17, wherein the first signal is a random access preamble and the second signal is a random access response. ### Claim 19 (depends on 18) A method according to claim 18, wherein the random access preamble comprises an indication of whether the user device is capable of operating using uplink carrier aggregation. ### Claim 20 (depends on 18) A method according to claim 18, wherein the random access response includes a random access radio network temporary identifier, the random access radio network temporary identifier comprising an indication of the one of the first carrier and the at least one second carrier on which the first signal was caused to be transmitted. ### Claim 21 (depends on 17) A method according to claim 17 comprising: receiving, from the user device, a third signal of the signalling procedure using the one of the first carrier and the at least one second carrier on which the at least one signal was caused to be transmitted. ### Claim 22 (depends on 17) A method according to claim 17, comprising receiving, from the user device, a third signal of the signalling procedure using at least one of the first carrier and the at least one second carrier in dependence on a listen-before-talk procedure performed on at least one of the first carrier and the at least one second carrier. ### Claim at position 18 23-29. (canceled) ### Claim 30 An apparatus comprising: at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: receive information at a user device capable of operating using carrier aggregation, said information comprising an indication of a first carrier and at least one second carrier to be used for a signalling procedure; cause transmission from the user device of a first signal of the signalling procedure using at least one of the first carrier and the at least one second carrier; and monitor the first carrier and the at least one second carrier for transmission of a second signal of the signalling procedure from an access point. ### Claim 31 An apparatus comprising: at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: provide information to a user device capable of operating using carrier aggregation, said information comprising an indication of a first carrier and at least one second carrier to be used for a signalling procedure; and receive a transmission from the user device of a first signal of the signalling procedure using at least one of the first carrier and the at least one second carrier; cause transmission of a second signal of the signalling procedure from an access point using at least one of the first carrier and the at least one second carrier. ### Claim 32 (depends on 1, 9) A computer program product for a computer, comprising software code portions for performing the steps of claim 1 or claim 9 when said product is run on the computer.