# US 10,772,110 B2 · Universal channel reservation signal for medium sharing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,110 B2 - Document ID: US10772110B2 - Status: Granted - Kind: B2 - Application number: 16/155,515 - Filed: 2018-10-09 - Published: 2019-05-09 - Granted: 2020-09-08 - Earliest claimed: 2017-11-07 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Xiaoxia Zhang; Tamer Kadous; Yongbin Wei; Zhifei Fan; Jing Sun; Aleksandar Damnjanovic; Bin Tian - Web page: https://patentgrep.com/patent/US10772110B2 ## CPC - H04W 72/12: Wireless traffic scheduling - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/04: Wireless resource allocation - H04W 74/0816: with collision avoidance - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Wireless communications systems and methods related to signaling medium reservation information medium sharing among multiple radio technologies (RATs) are provided. A wireless communication device of a first RAT detects a channel reservation signal of a second RAT in a spectrum shared by the first RAT and the second RAT. The wireless communication device determines whether the channel reservation signal indicates a first transmission opportunity (TXOP) duration or a second TXOP duration that is different from the first TXOP duration. The wireless communication device selects, based on the determination, at least one of performing a backoff or continuing to monitor the spectrum. ## Claims ### Claim 1 A method of wireless communication, comprising: detecting, by a wireless communication device of a first radio access technology (RAT), a channel reservation signal of a second RAT in a spectrum shared by the first RAT and the second RAT; determining, by the wireless communication device based on a repeating waveform sequence of the channel reservation signal, whether the channel reservation signal indicates a first transmission opportunity (TXOP) duration or a second TXOP duration that is different from the first TXOP duration; and carrying out, by the wireless communication device based on the determining, at least one of: performing a backoff when the channel reservation signal indicates the first TXOP duration; or continuing to monitor the spectrum when the channel reservation signal indicates the second TXOP duration. ### Claim 2 (depends on 1) The method of claim 1, wherein the first TXOP duration is a predetermined TXOP duration for sharing the spectrum between the first RAT and the second RAT, and wherein the second TXOP duration is shorter than the first TXOP duration. ### Claim 3 (depends on 2) The method of claim 2, wherein the second TXOP duration is configured for intra-RAT sharing. ### Claim 4 (depends on 1) The method of claim 1, wherein the determining includes: determining whether the repeating waveform sequence of the channel reservation signal includes a first waveform sequence representing the first TXOP duration or a second waveform sequence representing the second TXOP duration. ### Claim 5 (depends on 1) The method of claim 1, wherein the determining includes: determining whether the repeating waveform sequence of the channel reservation signal is at a first set of tone locations representing the first TXOP duration or at a second set of tone locations representing the second TXOP duration. ### Claim 6 (depends on 1) The method of claim 1, wherein the determining includes: determining whether adjacent waveform sequences in the channel reservation signal include a first phase shift representing the first TXOP duration or a second phase shift representing the second TXOP duration. ### Claim 7 (depends on 1) The method of claim 1, further comprising: receiving, by the wireless communication device, a channel reservation message associated with the channel reservation signal; and determining, by the wireless communication device, that the channel reservation signal is of the second RAT when decoding the channel reservation message is unsuccessful. ### Claim 8 A method of wireless communication, comprising: identifying, by a wireless communication device of a first radio access technology (RAT), a transmission opportunity (TXOP) in a spectrum shared by the first RAT and a second RAT; determining, by the wireless communication device, whether the TXOP includes a first TXOP duration or a second TXOP duration that is different from the first TXOP duration; selecting, based on the determination, at least one of transmitting a first channel reservation signal associated with the first TXOP duration or transmitting a second channel reservation signal associated with the second TXOP duration; and transmitting, by the wireless communication device based on the selecting, at least one of: the first channel reservation signal including a first repeating waveform sequence to indicate the first TXOP duration; or the second channel reservation signal including a second repeating waveform sequence to indicate the second TXOP duration. ### Claim 9 (depends on 8) The method of claim 8, wherein the first TXOP duration is a predetermined TXOP duration for sharing the spectrum between the first RAT and the second RAT, and wherein the second TXOP duration is shorter than the first TXOP duration. ### Claim 10 (depends on 8) The method of claim 8, wherein the second TXOP duration is configured for intra-RAT sharing. ### Claim 11 (depends on 8) The method of claim 8, further comprising wherein the transmitting, based on the selecting, further includes at least one of: transmitting, by the wireless communication device, the first channel reservation signal including the first repeating waveform sequence at a first set of tone locations to indicate the first TXOP duration; or transmitting, by the wireless communication device, the second channel reservation signal including the second repeating waveform sequence at a second set of tone locations to indicate the second TXOP duration. ### Claim 12 (depends on 8) The method of claim 8, wherein the transmitting, based on the selecting, further includes at least one of: transmitting, by the wireless communication device, the first channel reservation signal including a plurality of repeating waveform sequences, including the first repeating waveform sequence, with a first phase shift between adjacent waveform sequences to indicate the first TXOP duration; or transmitting, by the wireless communication device, the second channel reservation signal including a plurality of repeating waveform sequences, including the second repeating waveform sequence, with a second phase shift between adjacent waveform sequences to indicate the second TXOP duration. ### Claim 13 (depends on 8) The method of claim 8, wherein the second RAT includes an Institute of Electrical and Electronics Engineers (IEEE) 802.11 (WiFi) technology, and wherein the transmitting, based on the selecting, further includes at least one of: transmitting, by the wireless communication device, the first channel reservation signal to indicate the first TXOP duration based on at least one of a subcarrier spacing or a sampling rate of the WiFi technology; or transmitting, by the wireless communication device, the second channel reservation signal to indicate the second TXOP duration based on the at least one of the subcarrier spacing or the sampling rate of the WiFi technology. ### Claim 14 (depends on 8) The method of claim 8, wherein the transmitting, based on the selecting, further includes at least one of: transmitting, by the wireless communication device, the first repeating waveform sequence in a preamble of the first channel reservation signal; or transmitting, by the wireless communication device, the second repeating waveform sequence in a preamble of the second channel reservation signal. ### Claim 15 An apparatus comprising: a transceiver configured to detect a channel reservation signal of a second radio access technology (RAT) in a spectrum shared by a first RAT and the second RAT, wherein the apparatus is associated with the first RAT; and a processor configured to: determine, based on a repeating waveform sequence of the channel reservation signal, whether the channel reservation signal indicates a first transmission opportunity (TXOP) duration or a second TXOP duration that is different from the first TXOP duration; and carry out, based on the determination, at least one of: performing a backoff when the channel reservation signal indicates the first TXOP duration; or continuing to monitor the spectrum when the channel reservation signal indicates the second TXOP duration. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the first TXOP duration is a predetermined TXOP duration for sharing the spectrum between the first RAT and the second RAT, and wherein the second TXOP duration is shorter than the first TXOP duration. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the second TXOP duration is configured for intra-RAT sharing. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the processor is further configured to determine whether the channel reservation signal indicates the first TXOP duration or the second TXOP duration by: determining whether the repeating waveform sequence of the channel reservation signal includes a first waveform sequence representing the first TXOP duration or a second waveform sequence representing the second TXOP duration. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the processor is further configured to determine whether the channel reservation signal indicates the first TXOP duration or the second TXOP duration by: determining whether the repeating waveform sequence is at a first set of tone locations representing the first TXOP duration or at a second set of tone locations representing the second TXOP duration. ### Claim 20 (depends on 15) The apparatus of claim 15, wherein the processor is further configured to determine whether the channel reservation signal indicates the first TXOP duration or the second TXOP duration by: determining whether adjacent waveform sequences in the channel reservation signal include a first phase shift representing the first TXOP duration or a second phase shift representing the second TXOP duration. ### Claim 21 (depends on 15) The apparatus of claim 15, wherein the transceiver is further configured to receive a channel reservation message associated with the channel reservation signal, and wherein the processor is further configured to determine that the channel reservation signal is of the second RAT when decoding the channel reservation message is unsuccessful. ### Claim 22 An apparatus comprising: a transceiver; and a processor configured to: identify a transmission opportunity (TXOP) in a spectrum shared by a first radio access technology (RAT) and a second RAT, wherein the apparatus is associated with the first RAT; determine whether the TXOP includes a first TXOP duration or a second TXOP duration that is different from the first TXOP duration; select, based on the determination, at least one of configuring the transceiver to transmit a first channel reservation signal associated with the first TXOP duration or configuring the transceiver to transmit a second channel reservation signal associated with the second TXOP duration; and cause the transceiver to transmit, based on the selecting, at least one of: the first channel reservation signal including a first repeating waveform sequence to indicate the first TXOP duration; or the second channel reservation signal including a second repeating waveform sequence to indicate the second TXOP duration. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the first TXOP duration is a predetermined TXOP duration for sharing the spectrum between the first RAT and the second RAT, and wherein the second TXOP duration is shorter than the first TXOP duration. ### Claim 24 (depends on 22) The apparatus of claim 22, wherein the second TXOP duration is configured for intra-RAT sharing. ### Claim 25 (depends on 22) The apparatus of claim 22, wherein the transceiver is further configured to transmit, based on the selecting, at least one of: the first channel reservation signal including the first repeating waveform sequence at a first set of tone locations to indicate the first TXOP duration; or the second channel reservation signal including the second repeating waveform sequence at a second set of tone locations to indicate the second TXOP duration. ### Claim 26 (depends on 22) The apparatus of claim 22, wherein the transceiver is further configured to transmit, based on the selecting, at least one of: the first channel reservation signal including a plurality of repeating waveform sequences, including the first repeating waveform sequence, with a first phase shift between adjacent waveform sequences to indicate the first TXOP duration; and the second channel reservation signal including a plurality of waveform sequences, including the second repeating waveform sequence, with a second phase shift between adjacent waveform sequences to indicate the second TXOP duration. ### Claim 27 (depends on 22) The apparatus of claim 22, wherein the second RAT includes an Institute of Electrical and Electronics Engineers (IEEE) 802.11 (WiFi) technology, and wherein the transceiver is further configured to transmit, based on the selecting, at least one of: the first channel reservation signal to indicate the first TXOP duration based on at least one of a subcarrier spacing or a sampling rate of the WiFi technology; or the second channel reservation signal to indicate the second TXOP duration based on the at least one of the subcarrier spacing or the sampling rate of the WiFi technology. ### Claim 28 (depends on 22) The apparatus of claim 22, wherein the transceiver is further configured to transmit, based on the selecting, at least one of: the first repeating waveform sequence in a preamble of the first channel reservation signal; or the second repeating waveform sequence in a preamble of the second channel reservation signal including a field to indicate the second TXOP duration.