# US 2022/0046701 A1 · Method and apparatus for control channel design for data transmission on unlicensed spectrum > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0046701 A1 - Document ID: US20220046701A1 - Status: Published application - Kind: A1 - Application number: 17/279,046 - Filed: 2018-11-08 - Published: 2022-02-10 - Earliest claimed: 2018-11-08 - Assignees: Lenovo (Beijing) Limited - Applicants: Lenovo (Beijing) Limited - Inventors: Haipeng Lei; Alexander Johann Maria Golitschek Edler von Elbwart - Web page: https://patentgrep.com/patent/US20220046701A1 ## CPC - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0092: {Indication of how the channel is divided} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - 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 The present application relates to method and apparatus for downlink control channel design for data transmission on unlicensed spectrum. One embodiment of the present disclosure provides a method comprising: dividing a carrier bandwidth into a plurality of bandwidth portions, wherein each of the plurality of bandwidth portions includes a control region for transmitting control channel; performing a channel access test for each of the plurality of bandwidth portions; determining a first bandwidth portion from the plurality of bandwidth portions according to channel access test results of the plurality of bandwidth portions; transmitting a first control channel in a first control region of the first bandwidth portion, wherein the first control channel is used for scheduling a data transmission in one or more bandwidth portions of the plurality of bandwidth portions. ## Claims ### Claim 1 A method comprising: dividing a carrier bandwidth into a plurality of bandwidth portions, wherein each of the plurality of bandwidth portions includes a control region for transmitting a control channel; performing a channel access test for each of the plurality of bandwidth portions; determining a first bandwidth portion from the plurality of bandwidth portions according to channel access test results of the plurality of bandwidth portions; and transmitting a first control channel in a first control region of the first bandwidth portion, wherein the first control channel is used for scheduling a data transmission in one or more bandwidth portions of the plurality of bandwidth portions. ### Claim 2 (depends on 1) The method of claim 1, wherein the first bandwidth portion is a bandwidth portion with a lowest index among bandwidth portions with successful channel access test results, a bandwidth portion with a highest index among bandwidth portions with successful channel access test results, or a bandwidth portion with a best channel condition among bandwidth portions with successful channel access test results. ### Claim 3 (canceled) ### Claim 4 (canceled) ### Claim 5 (depends on 1) The method of claim 1, wherein the first control channel includes a first indicator indicating whether the control region in each of the plurality of bandwidth portions is used for the data transmission. ### Claim 6 (canceled) ### Claim 7 (canceled) ### Claim 8 (canceled) ### Claim 9 (depends on 1) The method of claim 1, wherein the first control channel includes a first indicator indicating whether the control region in each of the plurality of bandwidth portions is used for transmitting a control channel. ### Claim 10 (canceled) ### Claim 11 (canceled) ### Claim 12 (canceled) ### Claim 13 (depends on 1) The method of claim 1, wherein the number of the plurality of bandwidth portions is determined based on high layer signaling or a size of the carrier bandwidth. ### Claim 14 (canceled) ### Claim 15 (depends on 1) The method of claim 1, wherein the data transmission in a second control region of a second bandwidth portion of the one or more bandwidth portions of the plurality of bandwidth portions is punctured or adjusted to match the available resource in response to the second control region not being used for the data transmission. ### Claim 16 (canceled) ### Claim 17 (depends on 1) The method of claim 1, wherein the first control channel includes a second indicator indicating either puncturing or adjusting to match the available resource is used for the data transmission in control region(s) of the one or more bandwidth portions of the plurality of bandwidth portions. ### Claim 18 (depends on 1) The method of claim 1, further comprising transmitting a second control channel in the control region of a third bandwidth portion, wherein the second control channel indicates channel access test results of the plurality of bandwidth portions. ### Claim 19 (canceled) ### Claim 20 A method comprising: dividing a carrier bandwidth into a plurality of bandwidth portions, wherein each of the plurality of bandwidth portions includes a control region for control channel monitoring; identifying a first bandwidth portion from the plurality of bandwidth portions; and receiving a first control channel in a first control region of the first bandwidth portion, wherein the first control channel is used for scheduling a data transmission in one or more bandwidth portions of the plurality of bandwidth portions. ### Claim 21 (depends on 20) The method of claim 20, wherein identifying the first bandwidth portion from the plurality of bandwidth portions comprising: detecting a reference signal for control channel demodulation in the control region of each bandwidth portion of the plurality of bandwidth portions; and identifying the first bandwidth portion in response to the reference signal being detected. ### Claim 22 (depends on 20) The method of claim 20, wherein identifying the first bandwidth portion from the plurality of bandwidth portions comprising: detecting a downlink control information format in the control region of each bandwidth portion of the plurality of bandwidth portions; and identifying the first bandwidth portion in response to the downlink control information format being detected. ### Claim 23 (depends on 20) The method of claim 20, wherein identifying the first bandwidth portion from the plurality of bandwidth portions is in an order of indexes of the plurality of bandwidth portions. ### Claim 24 (depends on 20) The method of claim 20, wherein the first control channel includes a first indicator indicating whether the control region in each of the plurality of bandwidth portions is used for the data transmission. ### Claim 25 (depends on 24) The method of claim 24, wherein the first indicator comprises a bitmap, and each bit in the bitmap corresponds to one bandwidth portion of the plurality of bandwidth portions for indicating whether the control region of a corresponding bandwidth portion is used for the data transmission. ### Claim 26 (canceled) ### Claim 27 (canceled) ### Claim 28 (depends on 20) The method of claim 20, wherein the first control channel includes a first indicator indicating whether to monitor control channel in the control region of a bandwidth portion of the plurality of bandwidth portions. ### Claim 29 (depends on 28) The method of claim 28, wherein the first indicator comprises a bitmap, and each bit in the bitmap corresponds to a bandwidth portion of the plurality of bandwidth portions for indicating whether to monitor control channel in the control region of a corresponding bandwidth portion. ### Claim 30 (canceled) ### Claim 31 (canceled) ### Claim 32 (depends on 20) The method of claim 20, wherein the number of the plurality of bandwidth portions is determined based on high layer signaling or a size of the carrier bandwidth. ### Claim 33 (canceled) ### Claim 34 (depends on 20) The method of claim 20, wherein the data transmission in a second control region of a second bandwidth portion of the one or more bandwidth portions of the plurality of bandwidth portions is punctured or adjusted to match the available resource in response to the second control region not being used for the data transmission. ### Claim 35 (canceled) ### Claim 36 (depends on 20) The method of claim 20, wherein the first control channel includes a second indicator indicating either puncturing or adjusting to match the available resource is used for the data transmission in control regions of the one or more bandwidth portions of the plurality of bandwidth portions. ### Claim 37 (depends on 20) The method of claim 20, further comprising receiving a second control channel in the control region of a third bandwidth portion, wherein the second control channel indicates channel access test results of the plurality of bandwidth portions. ### Claim 38 (canceled) ### Claim 39 (canceled) ### Claim 40 (canceled)