# US 10,455,455 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 10,455,455 B2 - Document ID: US10455455B2 - Status: Granted - Kind: B2 - Application number: 15/596,692 - Filed: 2017-05-16 - Published: 2018-05-10 - Granted: 2019-10-22 - 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/US10455455B2 ## 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 communication in a wireless communication system, comprising: determining, by a first network entity of a first operator having a first priority level, whether to transmit on at least a portion of a transmission opportunity; transmitting a reservation preamble associated with the first network entity based on a determination by the first network entity to transmit on at least the portion of the transmission opportunity; forgoing transmission of the reservation preamble associated with the first network entity based on a determination by the first network entity to not transmit on at least the portion of the transmission opportunity; determining, by a second network entity of a second operator having a second priority level, whether a reservation preamble from one or more network entities of the first operator has been detected; transmitting a reservation preamble of the second network entity based on a determination that the reservation preamble from one or more network entities of the first operator has not been detected by at least the second network entity; and transmitting data associated with the second network entity within the portion of the transmission opportunity subsequent to the transmission of the reservation preamble of the second network entity. ### Claim 2 (depends on 1) The method of claim 1, wherein the reservation preamble of the first network entity notifies one or more network entities including at least one of the second network entity that a network entity belonging to the first operator will access a channel during the portion of the transmission opportunity. ### Claim 3 (depends on 1) The method of claim 1, further comprising, by the second network entity, restricting access to the portion of the transmission opportunity based on a determination that the reservation preamble from one or more network entities of the first operator has been detected. ### Claim 4 (depends on 1) The method of claim 1, wherein the reservation preamble of the first network entity is assigned a first listen-before-talk timeslot associated with the transmission opportunity and the reservation preamble of the second network entity is assigned a second listen-before-talk timeslot associated with the transmission opportunity. ### Claim 5 (depends on 1) The method of claim 1, wherein the first priority level of the first operator is greater than the second priority level of the second operator. ### Claim 6 (depends on 5) The method of claim 5, wherein the first priority level and the second priority level indicate an order of access rights for transmission of data within the portion of the transmission opportunity. ### Claim 7 (depends on 1) The method of claim 1, wherein transmitting the reservation preamble of the second entity is transmitted during a second timeslot following a first timeslot assigned to the first operator. ### Claim 8 (depends on 1) The method of claim 1, wherein the first and second network entities are synchronized. ### Claim 9 (depends on 1) The method of claim 1, further comprising restricting, by a network entity of the second operator, access to the portion of the transmission opportunity based on a determination that a downlink or an uplink reservation preamble of one or more network entities belonging to the first operator has been detected. ### Claim 10 (depends on 1) The method of claim 1, wherein the reservation preamble of the first network entity and the reservation preamble of the second network entity include a unique sequence common to the first operator and the second operator. ### Claim 11 (depends on 1) The method of claim 1, wherein the reservation preamble of the first network entity includes a first operator-specific sequence and the reservation preamble of the second network entity includes a second operator-specific sequence different from the first operator-specific sequence. ### Claim 12 (depends on 1) The method of claim 1, wherein the reservation preamble of the first network entity includes a first cell-specific sequence and the reservation preamble of the second entity includes a second cell-specific sequence different from the first cell-specific sequence. ### Claim 13 (depends on 1) The method of claim 1, wherein the reservation preamble associated with the first network entity is detected at the second network entity based on a determination that the reservation preamble is received at the second network entity having a signal level above a reception threshold value. ### Claim 14 (depends on 13) The method of claim 13, wherein the reception threshold value is configured by a network. ### Claim 15 (depends on 13) The method of claim 13, wherein transmitting data by the second network entity includes transmitting according to a maximum transmit power determined as a function of the received signal level of the reservation preamble associated with the first network entity. ### Claim 16 (depends on 1) The method of claim 1, wherein transmitting the reservation preamble associated with the first network entity or the reservation preamble associated with the second network entity includes transmitting via a backhaul communication channel. ### Claim 17 (depends on 1) The method of claim 1, wherein each of the first network entity and the second network entity is part of a group of network entities associated with distinct operators, and wherein the first operator associated with the first network entity within the group of network entities is assigned a highest priority level, the second operator associated with the second network entity within the group of network entities is assigned a second highest priority level, and wherein a remaining number of operators are assigned the lowest priority levels. ### Claim 18 An apparatus for wireless communications, comprising: a memory; and a processor coupled to the memory and configured to: determining, for a first network entity of a first operator having a first priority level, whether to transmit on at least a portion of a transmission opportunity; transmitting a reservation preamble associated with the first network entity based on a determination for the first network entity to transmit on at least the portion of the transmission opportunity; forgoing transmission of the reservation preamble associated with the first network entity based on a determination for the first network entity to not transmit on at least the portion of the transmission opportunity; determining, for a second network entity of a second operator having a second priority level, whether a reservation preamble from one or more network entities of the first operator has been detected; transmitting a reservation preamble of the second network entity based on a determination that the reservation preamble from one or more network entities of the first operator has not been detected by at least the second network entity; and transmitting data associated with the second network entity within the portion of the transmission opportunity subsequent to the transmission of the reservation preamble of the second network entity. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the reservation preamble of the first network entity notifies one or more network entities including at least one of the second network entity that a network entity belonging to the first operator will access a channel during the portion of the transmission opportunity. ### Claim 20 (depends on 18) The apparatus of claim 18, wherein the processor is further configured to, for the second network entity, restricting access to the portion of the transmission opportunity based on a determination that the reservation preamble from one or more network entities of the first operator has been detected. ### Claim 21 (depends on 18) The apparatus of claim 18, wherein the reservation preamble of the first network entity is assigned a first listen-before-talk timeslot associated with the transmission opportunity and the reservation preamble of the second network entity is assigned a second listen-before-talk timeslot associated with the transmission opportunity. ### Claim 22 (depends on 18) The apparatus of claim 18, wherein the processor is further configured to restrict, for the second network entity of the second operator, access to the portion of the transmission opportunity based on a determination that a downlink or an uplink reservation preamble of one or more network entities belonging to the first operator has been detected. ### Claim 23 (depends on 18) The apparatus of claim 18, wherein the reservation preamble of the first network entity and the reservation preamble of the second network entity include a unique sequence common to the first operator and the second operator. ### Claim 24 (depends on 18) The apparatus of claim 18, wherein the reservation preamble of the first network entity includes a first operator-specific sequence and the reservation preamble of the second network entity includes a second operator-specific sequence different from the first operator-specific sequence. ### Claim 25 A non-transitory computer-readable medium storing computer executable code for communication, comprising code for: determining, by a first network entity of a first operator having a first priority level, whether to transmit on at least a portion of a transmission opportunity; transmitting a reservation preamble associated with the first network entity based on a determination by the first network entity to transmit on at least the portion of the transmission opportunity; forgoing transmission of the reservation preamble associated with the first network entity based on a determination by the first network entity to not transmit on at least the portion of the transmission opportunity; determining, by a second network entity of a second operator having a second priority level, whether a reservation preamble from one or more network entities of the first operator has been detected; transmitting a reservation preamble of the second network entity based on a determination that the reservation preamble from one or more network entities of the first operator has not been detected by at least the second network entity; and transmitting data associated with the second network entity within the portion of the transmission opportunity subsequent to the transmission of the reservation preamble of the second network entity. ### Claim 26 An apparatus for wireless communications, comprising: means for determining, by a first network entity of a first operator having a first priority level, whether to transmit on at least a portion of a transmission opportunity; means for transmitting a reservation preamble associated with the first network entity based on a determination by the first network entity to transmit on at least the portion of the transmission opportunity; means for forgoing transmission of the reservation preamble associated with the first network entity based on a determination by the first network entity to not transmit on at least the portion of the transmission opportunity; means for determining, by a second network entity of a second operator having a second priority level, whether a reservation preamble from one or more network entities of the first operator has been detected; means for transmitting a reservation preamble of the second network entity based on a determination that the reservation preamble from one or more network entities of the first operator has not been detected by at least the second network entity; and means for transmitting data associated with the second network entity within the portion of the transmission opportunity subsequent to the transmission of the reservation preamble of the second network entity.