# US 10,772,025 B2 · Method and apparatus for channel access in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,025 B2 - Document ID: US10772025B2 - Status: Granted - Kind: B2 - Application number: 16/376,413 - Filed: 2019-04-05 - Published: 2019-08-01 - Granted: 2020-09-08 - Earliest claimed: 2016-02-15 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Jinyoung Oh; Taehan Bae; Jeongho Yeo - Web page: https://patentgrep.com/patent/US10772025B2 ## CPC - H04W 40/04: based on wireless node resources - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 72/1215: {for collaboration of different radio technologies} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A communication method for a channel access in a wireless communication system and an apparatus therefor are provided. The communication method includes an evolved NodeB (eNB) that transmits data to a user equipment (UE) through a licensed band, and determines whether an unlicensed band channel is in an idle state during a first channel sensing duration. If the unlicensed band channel is in the idle state, the eNB transmits data to the UE through an unlicensed band during a first channel occupying duration, a second channel sensing duration, and a second channel occupying duration. In the method, a sum of the first channel occupying duration, the second channel sensing duration, and the second channel occupying duration is equal to or less than a certain time. ## Claims ### Claim 1 A method performed by a base station, the method comprising: determining whether an unlicensed band channel of an unlicensed band is in an idle state during a first channel sensing duration according to a channel access priority class; transmitting data to a terminal through the unlicensed band during a first channel occupying duration, in case that the unlicensed band channel of the unlicensed band is in the idle state during the first channel sensing duration; identifying that the first channel occupying duration is less than a maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band according to the channel access priority class, and the first channel occupying duration is equal to an actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band according to a regional policy or a national policy; determining whether the unlicensed band channel of the unlicensed band is an idle state during a second channel sensing duration; and transmitting the data to the terminal through the unlicensed band during a second channel occupying duration, in case that the unlicensed band channel of the unlicensed band is in the idle state during the second channel sensing duration, wherein a sum of the first channel occupying duration, the second channel sensing duration, and the second channel occupying duration is equal to or less than a certain time determined based on a rounding up value of a result of a calculation between the maximum occupancy time and the actual occupancy time. ### Claim 2 (depends on 1) The method of claim 1, wherein the channel access priority class includes 3 or 4. ### Claim 3 (depends on 1) The method of claim 1, wherein the calculation includes dividing the maximum occupancy time by the actual occupancy time and then subtracting one. ### Claim 4 (depends on 1) The method of claim 1, wherein the certain time is determined according to 1000·Tmcot+ceil(Tmcot/Tj−1)·Tjs (μs), wherein Tmcot denotes the maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band, wherein Tj denotes the actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band, and wherein Tjs denotes a length of the second channel sensing duration. ### Claim 5 (depends on 1) The method of claim 1, wherein the second channel sensing duration includes: an idle slot duration including 16 μs, and two channel sensing slot durations each including 9 μs. ### Claim 6 A method performed by a terminal, the method comprising: receiving data from a base station through an unlicensed band during a first channel occupying duration, in case that an unlicensed band channel of the unlicensed band is in an idle state during a first channel sensing duration according to a channel access priority class; and receiving, when the first channel occupying duration is less than a maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band according to the channel access priority class and the first channel occupying duration is equal to an actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band according to a regional policy or a national policy, the data from the base station through the unlicensed band during a second channel occupying duration, in case that the unlicensed band channel of the unlicensed band is in an idle state during a second channel sensing duration, wherein a sum of the first channel occupying duration, the second channel sensing duration, and the second channel occupying duration is equal to or less than a certain time determined based on a rounding up value of a result of a calculation between the maximum occupancy time and the actual occupancy time. ### Claim 7 (depends on 6) The method of claim 6, wherein the channel access priority class includes 3 or 4. ### Claim 8 (depends on 6) The method of claim 6, wherein the calculation includes dividing the maximum occupancy time by the actual occupancy time and then subtracting one. ### Claim 9 (depends on 6) The method of claim 6, wherein the certain time is determined according to 1000·Tmcot+ceil(Tmcot/Tj−1)·Tjs (μs), wherein Tmcot denotes the maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band, wherein Tj denotes the actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band, and wherein Tjs denotes a length of the second channel sensing duration. ### Claim 10 (depends on 6) The method of claim 6, wherein the second channel sensing duration includes: an idle slot duration including 16 μs, and two channel sensing slot durations each including 9 μs. ### Claim 11 A base station in a wireless communication system, the base station comprising: a transceiver; and a controller configured to: determine whether an unlicensed band channel of an unlicensed band is in an idle state during a first channel sensing duration according to a channel access priority class, control the transceiver to transmit data to a terminal through the unlicensed band during a first channel occupying duration, in case that the unlicensed band channel of the unlicensed band is in the idle state during the first channel sensing duration, identify that the first channel occupying duration is less than a maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band according to the channel access priority class, and the first channel occupying duration is equal to an actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band according to a regional policy or a national policy, determine, whether the unlicensed band channel of the unlicensed band is an idle state during a second channel sensing duration, and control the transceiver to transmit the data to the terminal through the unlicensed band during a second channel occupying duration, in case that the unlicensed band channel of the unlicensed band is in the idle state during the second channel sensing duration, wherein a sum of the first channel occupying duration, the second channel sensing duration, and the second channel occupying duration is equal to or less than a certain time determined based on a rounding up value of a result of a calculation between the maximum occupancy time and the actual occupancy time. ### Claim 12 (depends on 11) The base station of claim 11, wherein the channel access priority class includes 3 or 4. ### Claim 13 (depends on 11) The base station of claim 11, wherein the calculation includes dividing the maximum occupancy time by the actual occupancy time and then subtracting one. ### Claim 14 (depends on 11) The base station of claim 11, wherein the certain time is determined according to 1000·Tmcot+ceil(Tmcot/Tj−1)·Tjs (μs), wherein Tmcot denotes the maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band, wherein Tj denotes the actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band, and wherein Tjs denotes a length of the second channel sensing duration. ### Claim 15 (depends on 11) The base station of claim 11, wherein the second channel sensing duration includes: an idle slot duration including 16 μs, and two channel sensing slot durations each including 9 μs. ### Claim 16 A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller configured to: control the transceiver to receive data from a base station through an unlicensed band during a first channel occupying duration, in case that an unlicensed band channel of the unlicensed band is in an idle state during a first channel sensing duration according to a channel access priority class, and control the transceiver to receive, when the first channel occupying duration is less than a maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band according to the channel access priority class and the first channel occupying duration is equal to an actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band according to a regional policy or a national policy, the data from the base station through the unlicensed band during a second channel occupying duration, in case that the unlicensed band channel of the unlicensed band is in an idle state during a second channel sensing duration, wherein a sum of the first channel occupying duration, the second channel sensing duration, and the second channel occupying duration is equal to or less than a certain time determined based on a rounding up value of a result of a calculation between the maximum occupancy time and the actual occupancy time. ### Claim 17 (depends on 16) The terminal of claim 16, wherein the calculation includes dividing the maximum occupancy time by the actual occupancy time and then subtracting one. ### Claim 18 (depends on 16) The terminal of claim 16, wherein the certain time is determined according to 1000·Tmcot+ceil(Tmcot/Tj−1)·Tjs (μs), wherein Tmcot denotes the maximum occupancy time possible for the base station or the terminal to continuously occupy the unlicensed band, wherein Tj denotes the actual occupancy time allowed for the base station or the terminal to continuously occupy the unlicensed band, and wherein Tjs denotes a length of the second channel sensing duration. ### Claim 19 (depends on 16) The terminal of claim 16, wherein the second channel sensing duration includes: an idle slot duration including 16 us, and two channel sensing slot durations each including 9 us. ### Claim 20 (depends on 16) The terminal of claim 16, wherein the channel access priority class includes 3 or 4.