# US 11,115,874 B2 · Techniques for reservation preamble for prioritized medium contention in a new radio shared spectrum communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,115,874 B2 - Document ID: US11115874B2 - Status: Granted - Kind: B2 - Application number: 16/569,193 - Filed: 2019-09-12 - Published: 2020-01-02 - Granted: 2021-09-07 - Earliest claimed: 2016-11-04 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Taesang Yoo; Xiaoxia Zhang; Siddhartha Mallik; Juan Montojo; Aleksandar Damnjanovic - Web page: https://patentgrep.com/patent/US11115874B2 ## CPC - H04W 28/26: Resource reservation - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 52/346: {distributing total power among users or channels} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/56: based on priority criteria - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 74/0816: with collision avoidance - H04L 67/303: Terminal profiles - 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 Methods and apparatuses for wireless communications are described. The aspects relate to a frame structure for new radio shared spectrum. For instance, the frame structure may provide shared medium access by multiple operators in a new radio shared spectrum system. Specifically, the present aspects provide for utilizing reservation preambles associated with a distinct operator for announcing to other operators a reservation of at least one transmission opportunity of a given frame in the new radio shared spectrum. ## Claims ### Claim 1 A method of wireless communications at a user equipment (UE) associated with a first operator, comprising: receiving, on a preamble timeslot assigned to the first operator from a first network entity, a downlink reservation preamble; receiving an indication including a number of operators from the first network entity; determining a transmission opportunity structure of an uplink reservation preamble including a starting location of a transmission opportunity including one or more listen-before-talk time slots based on the number of operators from the first network entity; and transmitting, within the preamble timeslot assigned to the first operator and subsequent to the receiving of the downlink reservation preamble, the uplink reservation preamble of the first operator to a second network entity. ### Claim 2 (depends on 1) The method of claim 1, wherein the downlink reservation preamble includes at least one UE identifier, the method further comprising: determining whether the at least one UE identifier corresponds to an identifier of the UE, wherein transmitting the uplink reservation preamble includes transmitting the uplink reservation preamble based on a determination that the at least one UE identifier corresponds to the identifier of the UE. ### Claim 3 (depends on 2) The method of claim 2, wherein receiving on the downlink reservation preamble is performed on a downlink frequency band and transmitting on the uplink reservation preamble is performed on an uplink frequency band. ### Claim 4 (depends on 1) The method of claim 1, wherein transmitting the uplink reservation preamble includes transmitting the uplink reservation preamble when at least one network condition as configured via semi-static configuration for the UE is met. ### Claim 5 (depends on 1) The method of claim 1, wherein each listen-before-talk time slot includes a downlink portion and an uplink portion after the downlink portion, and wherein the downlink reservation preamble is transmitted in the downlink portion, and the uplink reservation preamble is transmitted in the uplink portion. ### Claim 6 (depends on 1) The method of claim 1, wherein the preamble timeslot is associated with a transmission opportunity, the method further comprising: receiving at least one of a duration or a priority of at least the transmission opportunity; monitoring reservation preamble transmissions from higher priority operators than the first operator for the transmission opportunity; determining that at least one of the higher priority operators transmitted an associated reservation preamble; and forgoing monitoring of a channel for the duration of the transmission opportunity. ### Claim 7 An apparatus for wireless communications, comprising: a memory; and a processor coupled to the memory and configured to: receive, on a preamble timeslot assigned to a first operator from a first network entity, a downlink reservation preamble; receive an indication including a number of operators from the first network entity; determine a transmission opportunity structure of an uplink reservation preamble including a starting location of a transmission opportunity including one or more listen-before-talk time slots based on the number of operators from the first network entity; and transmit, within the preamble timeslot assigned to the first operator and subsequent to a reception of the downlink reservation preamble, the uplink reservation preamble of the first operator to a second network entity. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the downlink reservation preamble includes at least one user equipment (UE) identifier, wherein the processor is further configured to: determine whether the at least one UE identifier corresponds to an identifier of the apparatus, wherein to transmit the uplink reservation preamble, the processor is further configured to transmit the uplink reservation preamble based on a determination that the at least one UE identifier corresponds to the identifier of the apparatus. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein receiving on the downlink reservation preamble is performed on a downlink frequency band and transmitting on the uplink reservation preamble is performed on an uplink frequency band. ### Claim 10 (depends on 7) The apparatus of claim 7, wherein to transmit the uplink reservation preamble, the processor is further configured to transmit the uplink reservation preamble when at least one network condition as configured via semi-static configuration for the apparatus is met. ### Claim 11 (depends on 7) The apparatus of claim 7, wherein each listen-before-talk time slot includes a downlink portion and an uplink portion after the downlink portion, and wherein the downlink reservation preamble is transmitted in the downlink portion, and the uplink reservation preamble is transmitted in the uplink portion. ### Claim 12 (depends on 7) The apparatus of claim 7, wherein the preamble timeslot is associated with a transmission opportunity, wherein the processor is further configured to: receive at least one of a duration or a priority of at least the transmission opportunity; monitor reservation preamble transmissions from higher priority operators than the first operator for the transmission opportunity; determine that at least one of the higher priority operators transmitted an associated reservation preamble; and forgo monitoring of a channel for the duration of the transmission opportunity. ### Claim 13 A non-transitory computer-readable medium storing computer code executable by a processor for wireless communication by a user equipment (UE), comprising code for: receiving, on a preamble timeslot assigned to a first operator from a first network entity, a downlink reservation preamble; receiving an indication including a number of operators from the first network entity; determining a transmission opportunity structure of an uplink reservation preamble including a starting location of a transmission opportunity including one or more listen-before-talk time slots based on the number of operators from the first network entity; and transmitting, within the preamble timeslot assigned to the first operator and subsequent to the receiving of the downlink reservation preamble, the uplink reservation preamble of the first operator to a second network entity. ### Claim 14 (depends on 13) The non-transitory computer-readable medium of claim 13, wherein the downlink reservation preamble includes at least one UE identifier, and further comprising code for: determining whether the at least one UE identifier corresponds to an identifier of the UE, wherein transmitting the uplink reservation preamble includes transmitting the uplink reservation preamble based on a determination that the at least one UE identifier corresponds to the identifier of the UE. ### Claim 15 (depends on 14) The non-transitory computer-readable medium of claim 14, wherein receiving on the downlink reservation preamble is performed on a downlink frequency band and transmitting on the uplink reservation preamble is performed on an uplink frequency band. ### Claim 16 (depends on 13) The non-transitory computer-readable medium of claim 13, wherein transmitting the uplink reservation preamble includes transmitting the uplink reservation preamble when at least one network condition as configured via semi-static configuration for the UE is met. ### Claim 17 (depends on 13) The non-transitory computer-readable medium of claim 13, wherein each listen-before-talk time slot includes a downlink portion and an uplink portion after the downlink portion, and wherein the downlink reservation preamble is transmitted in the downlink portion, and the uplink reservation preamble is transmitted in the uplink portion. ### Claim 18 (depends on 13) The non-transitory computer-readable medium of claim 13, wherein the preamble timeslot is associated with the transmission opportunity, and further comprising code for: receiving at least one of a duration or a priority of at least the transmission opportunity; monitoring reservation preamble transmissions from higher priority operators than the first operator for the transmission opportunity; determining that at least one of the higher priority operators transmitted an associated reservation preamble; and forgoing monitoring of a channel for the duration of the transmission opportunity.