# US 2021/0243804 A1 · Methods for efficient use of unlicensed spectrum > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243804 A1 - Document ID: US20210243804A1 - Status: Published application - Kind: A1 - Application number: 17/167,502 - Filed: 2021-02-04 - Published: 2021-08-05 - Earliest claimed: 2018-01-10 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Tai Do; Peter Alriksson; Thomas Nilsson - Web page: https://patentgrep.com/patent/US20210243804A1 ## CPC - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L 5/0092: {Indication of how the channel is divided} - H04L 27/2607: {Cyclic extensions} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - 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 Systems and methods for efficient use of unlicensed spectrum are disclosed. In some embodiments, a method performed by a transmitter comprises performing a Listen-Before-Talk (LBT) procedure for a channels within a transmit bandwidth of the transmit node, where the transmit bandwidth is divided into a bandwidth parts that correspond to the channels. The method further comprises transmitting a transmission in a subset of the bandwidth parts that correspond to a subset of the channels determined, based on a result of the LBT procedure, to be available. Transmitting the transmission comprises transmitting the transmission in accordance with a transmit scheme that uses carrier aggregation and/or carrier merging to transmit the transmission on the subset of the bandwidth parts and uses resources in one or more guard bands between two or more adjacent bandwidth parts from among the subset of the bandwidth parts. ## Claims ### Claim 1 A method performed by a transmit node to perform a transmission in a frequency spectrum requiring Listen-Before-Talk, LBT, comprising: performing an LBT procedure for a plurality of channels each comprising a group of contiguous Physical Resource Blocks, PRBs, within a transmit bandwidth of the transmit node to determine that a subset of the plurality of channels is available; and transmitting a transmission in the subset of the plurality of channels determined to be available, wherein transmitting the transmission comprises one of: transmitting the transmission concurrently on the subset of the plurality of channels independent of whether the subset of the plurality of channels is adjacent; merging at least two adjacent channels among the subset of the plurality of channels into a merged channel and transmitting the transmission on the merged channel; and merging the at least two adjacent channels among the subset of the plurality of channels into the merged channel and transmitting the transmission currently on the merged channel and at least one of the subset of the plurality of channels non-adjacent to the merged channel. ### Claim 2 (depends on 1) The method of claim 1, wherein transmitting the transmission concurrently on the subset of the plurality of channels independent of whether the subset of the plurality of channels is adjacent comprises transmitting the transmission in accordance with a carrier aggregation scheme. ### Claim 3 (depends on 1) The method of claim 1, wherein: merging the at least two adjacent channels comprises merging the at least two adjacent channels in accordance with a carrier merging scheme; and transmitting the transmission currently on the merged channel and the at least one of the subset of the plurality of channels non-adjacent to the merged channel comprises transmitting the transmission in accordance with a carrier aggregation scheme. ### Claim 4 (depends on 1) The method of claim 1, wherein the at least two adjacent channels are separated by a guard band comprising one or more extra PRBs and transmitting the transmission further comprises transmitting the transmission in at least one of the one or more extra PRBs in the guard band. ### Claim 5 (depends on 1) The method of claim 1, wherein the transmit bandwidth is divided into a plurality of bandwidth parts each corresponding to a respective one of the plurality of channels and comprising the group of contiguous PRBs within the transmit bandwidth of the transmit node. ### Claim 6 (depends on 5) The method of claim 5, wherein transmitting the transmission further comprises one of: transmitting the transmission concurrently on a subset of the plurality of bandwidth parts independent of whether the subset of the plurality of bandwidth parts is adjacent; merging at least two adjacent bandwidth parts among the subset of the plurality of bandwidth parts into a merged bandwidth part and transmitting the transmission on the merged bandwidth part; and merging the at least two adjacent bandwidth parts among the subset of the plurality of bandwidth parts into the merged bandwidth part and transmitting the transmission currently on the merged bandwidth part and at least one of the subset of the plurality of bandwidth parts non-adjacent to the merged bandwidth part. ### Claim 7 (depends on 6) The method of claim 6, wherein the at least two adjacent bandwidth parts are separated by a guard band comprising one or more extra PRBs and transmitting the transmission further comprises transmitting the transmission in at least one of the one or more extra PRBs in the guard band. ### Claim 8 (depends on 1) The method of claim 1, wherein the transmit bandwidth is divided into a plurality of bandwidth parts each corresponding to two or more of the plurality of channels and comprising the group of contiguous PRBs within the transmit bandwidth of the transmit node. ### Claim 9 (depends on 1) The method of claim 1, wherein the transmit bandwidth is divided into a plurality of bandwidth parts and each of the plurality of channels comprises two or more of the plurality of bandwidth parts. ### Claim 10 (depends on 1) The method of claim 1, wherein each of the plurality of channels is divided into a plurality of interlaces, each of the plurality of interlaces comprising a subset of the group of contiguous PRBs in a respective one of the plurality of channels. ### Claim 11 A method performed by a transmit node to perform transmission in a frequency spectrum requiring Listen-Before-Talk, LBT, comprising: performing an LBT procedure for a plurality of channels each comprising a group of contiguous Physical Resource Blocks, PRBs, within a transmit bandwidth of the transmit node to determine that a subset of the plurality of channels is available; and transmitting during a first part and a second part of a Transmit Opportunity, TxOP, in the subset of the plurality of channels determined to be available. ### Claim 12 (depends on 11) The method of claim 11, wherein the subset of the plurality of channels comprises at least two adjacent channels separated by a guard band comprising one or more extra PRBs. ### Claim 13 (depends on 12) The method of claim 12 wherein: transmitting during the first part of the TxOP comprises transmitting during the first part of the TxOP in accordance with a first transmit scheme that does not utilize the one or more extra PRBs in the guard band; and transmitting during the second part of the TxOP comprises transmitting during the second part of the TxOP in accordance with a second transmit scheme that utilizes the one or more extra PRBs in the guard band. ### Claim 14 (depends on 11) The method of claim 11, wherein the transmit bandwidth is divided into a plurality of bandwidth parts each corresponding to a respective one of the plurality of channels and comprising the group of contiguous PRBs within the transmit bandwidth of the transmit node. ### Claim 15 (depends on 14) The method of claim 14, wherein transmitting during the first part and the second part of the TxOP in the subset of the plurality of channels comprises transmitting during the first part and the second part of the TxOP in the subset of the plurality of bandwidth parts. ### Claim 16 A wireless device comprising a transmit node for performing a transmission in a frequency spectrum requiring Listen-Before-Talk, LBT, wherein the transmit node comprises: at least one transmitter; and processing circuitry associated with the at least one transmitter, the processing circuitry configured to cause the transmit node to: perform an LBT procedure for a plurality of channels each comprising a group of contiguous Physical Resource Blocks, PRBs, within a transmit bandwidth of the transmit node to determine that a subset of the plurality of channels is available; and transmit a transmission in the subset of the plurality of channels determined to be available, wherein transmitting the transmission comprises one of: transmitting the transmission concurrently on the subset of the plurality of channels independent of whether the subset of the plurality of channels is adjacent; and merging at least two adjacent channels among the subset of the plurality of channels into a merged channel and transmitting the transmission currently on the merged channel and at least one of the subset of the plurality of channels non-adjacent to the merged channel. ### Claim 17 A method performed by a receiver to receive a transmission in a frequency spectrum requiring Listen-Before-Talk, LBT, comprising: receiving, from a transmit node, a transmission in a subset of a plurality of channels each comprising a group of contiguous Physical Resource Blocks, PRBs, within a transmit bandwidth of the transmit node and determined to be available for the transmission, wherein receiving the transmission comprises one of: receiving the transmission concurrently on the subset of the plurality of channels independent of whether the subset of the plurality of channels is adjacent; receiving the transmission on a merged channel comprising at least two adjacent channels among the subset of the plurality of channels; and receiving the transmission currently on the merged channel comprising the at least two adjacent channels among the subset of the plurality of channels and at least one of the subset of the plurality of channels non-adjacent to the merged channel. ### Claim 18 (depends on 17) The method of claim 17 further comprising preconfiguring the transmit node or signaling a configuration to the transmit node with one or more parameters that indicate at least one interlace to be used by the transmit node for the transmission of the transmit node. ### Claim 19 (depends on 18) The method of claim 18 further comprising: performing an LBT procedure for a set of channels comprising the plurality of channels within the transmit bandwidth of the transmit node to thereby determine two or more available channels from among the plurality of channels within the transmit bandwidth of the transmit node; and signaling, to the transmit node, an indication of the two or more available channels. ### Claim 20 (depends on 19) The method of claim 19 wherein the transmission shares a channel occupancy of an associated transmission from the receiver.