# US 10,772,127 B2 · Method and device for transmitting data burst in wireless access system supporting unlicensed band and carrier aggregation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,127 B2 - Document ID: US10772127B2 - Status: Granted - Kind: B2 - Application number: 15/741,834 - Filed: 2016-07-11 - Published: 2018-07-12 - Granted: 2020-09-08 - Earliest claimed: 2015-07-10 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seonwook Kim; Joonkui Ahn; Hanbyul Seo; Byounghoon Kim; Hanjun Park - Web page: https://patentgrep.com/patent/US10772127B2 ## CPC - H04W 74/0816: with collision avoidance - H04L 1/0001: {Systems modifying transmission characteristics according to link quality, e.g. power backoff (adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04)} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0031: {Multiple signaling transmission (H04L1/1664, F15 take precedence)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 5/001: {the frequencies being arranged in component carriers} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 16/14: Spectrum sharing arrangements {between different networks} - 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) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method for transmitting a signal in a wireless access system and a device supporting the same includes, for carrier sensing methods, a method for performing a channel access procedure, for selecting a representative carrier, and for transmitting a data burst. ## Claims ### Claim 1 A method for a base station in a wireless access system, the method comprising: selecting a first component carrier (CC) included in a set of CCs, wherein the CCs are configured in an unlicensed band; performing a first channel access procedure (CAP) on the first CC; transmitting, based on the first CAP, a first transmission burst on the first CC after the first CC is determined to be idle and after a random number decrements to 0 based on decrementing the random number by 1 for each slot duration related to the first CC determined to be idle, wherein the random number is randomly obtained among a value included in a contention window; performing a second CAP on a second CC included in the set of CCs for a predetermined time duration immediately before the transmission of the first transmission burst on the first CC, wherein the second CC is different from the first CC; and transmitting, based on the second CAP, a second transmission burst on the second CC after the second CC is determined to be idle for the predetermined time duration. ### Claim 2 (depends on 1) The method of claim 1, wherein based on the set of CCs are grouped into at least two groups, the first CC is selected for the at least two groups. ### Claim 3 (depends on 1) The method of claim 1, wherein the selection is performed before each transmission on a CC included in the set of CCs. ### Claim 4 (depends on 1) The method of claim 1, wherein the selection is performed once in a predetermined time interval. ### Claim 5 (depends on 1) The method of claim 1, further comprising: performing the second CAP on a third CC included in the set of CCs; and transmitting, based on the second CAP, a third transmission burst on the third CC after the third CC is determined to be idle for the predetermined time duration, wherein the third transmission burst comprises a discovery signal without a physical downlink shared channel (PDSCH). ### Claim 6 (depends on 1) The method of claim 1, wherein the first CC and the second CC are consecutive in a frequency domain. ### Claim 7 A base station in a wireless access system, the base station comprising: a memory; and at least one processor coupled with the memory and configured to: select a first component carrier (CC) included in a set of CCs, wherein the CCs are configured in an unlicensed band; perform a first channel access procedure (CAP) on the first CC; transmit, based on the first CAP, a first transmission burst on the first CC after the first CC is determined to be idle and after a random number decrements to 0 based on decrementing the random number by 1 for each slot duration related to the first CC determined to be idle, wherein the random number is randomly obtained among a value included in a contention window; perform a second CAP on a second CC included in the set of CCs for a predetermined time duration immediately before the transmission of the first transmission burst on the first CC, wherein the second CC is different from the first CC; and transmit, based on the second CAP, a second transmission burst on the second CC after the second CC is determined to be idle for the predetermined time duration. ### Claim 8 (depends on 7) The base station of claim 7, wherein based on the set of CCs are grouped into at least two groups, the first CC is selected for the at least two groups. ### Claim 9 (depends on 7) The base station of claim 7, wherein the selection is performed before each transmission on a CC included in the set of CCs. ### Claim 10 (depends on 7) The base station of claim 7, wherein the selection is performed once in a predetermined time interval. ### Claim 11 A method for a user equipment (UE) in a wireless access system, the method comprising: selecting a first component carrier (CC) included in a set of CCs, wherein the CCs are configured in an unlicensed band; performing a first channel access procedure (CAP) on the first CC; transmitting, based on the first CAP, a first transmission burst on the first CC after the first CC is determined to be idle and after a random number decrements to 0 based on decrementing the random number by 1 for each slot duration related to the first CC determined to be idle, wherein the random number is randomly obtained among a value included in a contention window; performing a second CAP on a second CC included in the set of CCs—for a predetermined time duration immediately before the transmission of the first transmission burst on the first CC, wherein the second CC is different from the first CC; and transmitting, based on the second CAP, a second transmission burst on the second CC after the second CC is determined to be idle for the predetermined time duration. ### Claim 12 A user equipment (UE) for transmitting a signal in a wireless access system, the UE comprising: a memory; and at least one processor coupled with the memory and configured to: select a first component carrier (CC) included in a set of CCs, wherein the CCs are configured in an unlicensed band; perform a first channel access procedure (CAP) on the first CC; transmit, based on the first CAP, a first transmission burst on the first CC after the first CC is determined to be idle and after a random number decrements to 0 based on decrementing the random number by 1 for each slot duration related to the first CC determined to be idle, wherein the random number is randomly obtained among a value included in a contention window; perform a second CAP on a second CC included in the set of CCs for a predetermined time duration immediately before the transmission of the first transmission burst on the first CC, wherein the second CC is different from the first CC; and transmit, based on the second CAP, a second transmission burst on the second CC after the second CC is determined to be idle for the predetermined time duration.