# US 12,114,353 B2 · Category 4 (CAT4) listen-before-transmit (LBT) operations for wireless communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,114,353 B2 - Document ID: US12114353B2 - Status: Granted - Kind: B2 - Application number: 17/449,870 - Filed: 2021-10-04 - Published: 2022-04-07 - Granted: 2024-10-08 - Earliest claimed: 2020-10-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jing Sun; Vinay Chande; Arumugam Chendamarai Kannan; Xiaoxia Zhang; Aleksandar Damnjanovic - Web page: https://patentgrep.com/patent/US12114353B2 ## CPC - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/0473: {the resource being transmission power} - H04W 74/002: {Transmission of channel access control information} - H04W 74/0816: with collision avoidance - H04W 48/12: using downlink control channel - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method of wireless communication includes determining, by a communication device, a value of a counter associated with a listen-before-talk (LBT) operation. The method further includes, after determining the value of the counter and during a first portion of a deferral interval associated with the LBT operation, performing a first measurement of a particular duration to determine a first energy value. The method further includes, during a second portion of the deferral interval subsequent to the first portion, performing a second measurement of the particular duration to determine a second energy value. The method also includes determining whether to initiate a contention interval associated with the LBT operation based on the first energy value and further based on the second energy value. ## Claims ### Claim 1 An apparatus for wireless communication, the apparatus comprising: a memory; and one or more processors coupled to the memory and configured to: receive a category two (Cat2) configuration message indicating whether Cat2 listen-before-talk (LBT) operations are enabled or disabled for the apparatus; in accordance with the Cat2 configuration message indicating that the Cat2 LBT operations are disabled for the apparatus, determine a value of a counter associated with a category four (Cat4) LBT operation; after a deferral interval associated with the Cat4 LBT operation and during a contention interval associated with the Cat4 LBT operation, perform a measurement of a particular duration to determine an energy value, the particular duration in accordance with a processing time associated with the apparatus; and determine whether to adjust the value of the counter based on the energy value. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the energy value fails to satisfy a threshold energy value, and wherein the one or more processors are further configured to adjust the value of the counter. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the one or more processors are further configured to initiate a transmission in response to determining that the value of the counter satisfies a threshold counter value. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the energy value satisfies a threshold energy value, and wherein the one or more processors are further configured to re-initiate the deferral interval. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further configured to perform the measurement at a beginning of the contention interval. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further configured to randomly select the value of the counter from a group of values including one, two, and three, and wherein zero is excluded from the group of values. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the processing time is in accordance with one or more of a first time associated with comparison of the energy value to a threshold energy value or a second time associated with adjustment of a transmitter of the apparatus. ### Claim 8 An apparatus for wireless communication, the apparatus comprising: a memory; and one or more processors coupled to the memory and configured to: receive a category two (Cat2) configuration message indicating whether Cat2 listen-before-talk (LBT) operations are enabled or disabled for the apparatus; in accordance with the Cat2 configuration message indicating that the Cat2 LBT operations are disabled for the apparatus, determine a value of a counter associated with a category four (Cat4) LBT operation; after determining the value of the counter and during a deferral interval associated with the Cat4 LBT operation, perform a first measurement of a first duration to determine a first energy value; based on the first energy value and during a contention interval associated with the Cat4 LBT operation following the deferral interval, perform a second measurement of a second duration to determine a second energy value, the second duration different than the first duration; and determine whether to adjust the value of the counter based on the second energy value. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the second energy value fails to satisfy a threshold energy value, and wherein the one or more processors are further configured to adjust the value of the counter. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the one or more processors are further configured to initiate a transmission in response to determining that the value of the counter satisfies a threshold counter value. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the second energy value satisfies a threshold energy value, and wherein the one or more processors are further configured to re-initiate the deferral interval. ### Claim 12 (depends on 8) The apparatus of claim 8, wherein the one or more processors are further configured to randomly select the value of the counter from a group of values including one, two, and three, and wherein zero is excluded from the group of values. ### Claim 13 A method of wireless communication performed by a communication device, the method comprising: receiving a category two (Cat2) configuration message indicating whether Cat2 listen-before-talk (LBT) operations are enabled or disabled for the communication device; in accordance with the Cat2 configuration message indicating that the Cat2 LBT operations are disabled for the communication device, determining a value of a counter associated with a category four (Cat4) LBT operation; after a deferral interval associated with the Cat4 LBT operation and during a contention interval associated with the Cat4 LBT operation, performing a measurement of a particular duration to determine an energy value, the particular duration in accordance with a processing time associated with the communication device; and determining whether to adjust the value of the counter based on the energy value. ### Claim 14 (depends on 13) The method of claim 13, wherein the energy value fails to satisfy a threshold energy value, the method further comprising the value of the counter. ### Claim 15 (depends on 14) The method of claim 14, further comprising initiating a transmission in response to determining that the value of the counter satisfies a threshold counter value. ### Claim 16 (depends on 13) The method of claim 13, wherein the energy value satisfies a threshold energy value, the method further comprising re-initiating the deferral interval. ### Claim 17 (depends on 13) The method of claim 13, wherein the measurement is performed at a beginning of the contention interval. ### Claim 18 (depends on 13) The method of claim 13, further comprising randomly selecting the value of the counter from a group of values including one, two, and three, wherein zero is excluded from the group of values. ### Claim 19 A method of wireless communication performed by a communication device, the method comprising: receiving a category two (Cat2) configuration message indicating whether Cat2 listen-before-talk (LBT) operations are enabled or disabled for the communication device; in accordance with the Cat2 configuration message indicating that the Cat2 LBT operations are disabled for the communication device, determining a value of a counter associated with a category four (Cat4) LBT operation; after determining the value of the counter and during a deferral interval associated with the Cat4 LBT operation, performing a first measurement of a first duration to determine a first energy value; based on the first energy value and during a contention interval associated with the Cat4 LBT operation following the deferral interval, performing a second measurement of a second duration to determine a second energy value, the second duration different than the first duration; and determining whether to adjust the value of the counter based on the second energy value. ### Claim 20 (depends on 19) The method of claim 19, wherein the second energy value fails to satisfy a threshold energy value, the method further comprising adjusting the value of the counter. ### Claim 21 (depends on 20) The method of claim 20, further comprising initiating a transmission in response to determining that the value of the counter satisfies a threshold counter value. ### Claim 22 (depends on 19) The method of claim 19, wherein the second energy value satisfies a threshold energy value, the method further comprising re-initiating the deferral interval. ### Claim 23 (depends on 19) The method of claim 19, further comprising randomly selecting the value of the counter from a group of values including one, two, and three, wherein zero is excluded from the group of values.