# US 11,445,381 B2 · Methods supporting multicast/multiuser transmission using listen after talk and related network nodes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,381 B2 - Document ID: US11445381B2 - Status: Granted - Kind: B2 - Application number: 16/614,203 - Filed: 2017-05-16 - Published: 2021-11-18 - Granted: 2022-09-13 - Earliest claimed: 2017-05-16 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Gen Li; Junaid Ansari - Web page: https://patentgrep.com/patent/US11445381B2 ## CPC - H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)} - H04W 16/28: using beam steering - H04L 1/1896: {ARQ related signaling} - H04L 12/1868: {Measures taken after transmission, e.g. acknowledgments} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0816: with collision avoidance - H04W 72/30: Resource management for broadcast services - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 to operate an access node of a wireless communication network is provided. A first frame may be provided including a first header and a first data block with first data for a first wireless terminal and a second wireless terminal. The header may include a first control field indicating a first idle period resource and a second control field indicating a second idle period resource, and the first and second idle period resources may be different. Transmission of the first frame to the first and second wireless terminals may be initiated. Responsive to receiving a notification message using the first idle period resource, a second frame may be provided including a second header and a second data block with second data for the second wireless terminal. Transmission of the second frame to the second wireless terminal may be initiated while deferring transmission to the first wireless terminal. ## Claims ### Claim 1 A method of operating an access node of a wireless communication network, the method comprising: providing a first frame including a first header and a first data block with first data for a first wireless terminal and a second wireless terminal, wherein the header includes a first control field indicating a first idle period resource and a second control field indicating a second idle period resource, wherein the first and second idle period resources are different; initiating transmission of the first frame to the first and second wireless terminals; responsive to receiving a notification message using the first idle period resource, providing a second frame including a second header and a second data block with second data for the second wireless terminal; and initiating transmission of the second frame to the second wireless terminal while deferring transmission to the first wireless terminal. ### Claim 2 (depends on 1) The method of claim 1, wherein initiating transmission of the first frame comprises using a first beam for the first wireless terminal and a second beam for the second wireless terminal, wherein the first control field is transmitted to the first wireless terminal using the first beam and the second control field is transmitted to the second wireless terminal using the second beam, wherein the first idle period resource corresponds to the first beam, and wherein the second idle period resource corresponds to the second beam, and wherein initiating transmission of the second frame comprises using the second beam for the second wireless terminal while deferring transmission using the first beam. ### Claim 3 (depends on 1) The method of claim 1, wherein the first data is for the first wireless terminal, the second wireless terminal, and a third wireless terminal, wherein the header includes a third control field indicating a third idle period resource, wherein initiating transmission of the first frame comprises initiating transmission of the first frame to the first, second, and third wireless terminals, and wherein the second data is for the second and third wireless terminals. ### Claim 4 (depends on 3) The method of claim 3, wherein initiating transmission of the first frame comprises using a first beam for the first wireless terminal, using a second beam for the second wireless terminal, and using a third beam for the third wireless terminal, wherein the first control field is transmitted to the first wireless terminal using the first beam, the second control field is transmitted to the second wireless terminal using the second beam, and the third control field is transmitted to the third wireless terminal using the third beam, wherein the first idle period resource corresponds to the first beam, the second idle period resource corresponds to the second beam, and the third idle period resource corresponds to the third beam, and wherein initiating transmission of the second frame comprises initiating transmission of the second frame to the second and third wireless terminals using the second beam for the second wireless terminal and using the third beam for the third wireless terminal while deferring transmission using the first beam. ### Claim 5 (depends on 4) The method of claim 4, wherein the first, second, and third beams define respective first, second, and third beamforming directions, wherein the first and second beamforming directions are different, wherein the first and third beamforming directions are different, and wherein the second and third beamforming directions are different. ### Claim 6 (depends on 5) The method of claim 5, wherein the first data includes first data for the first wireless terminal and first data for the second wireless terminal, wherein the first data for the first wireless terminal is different than the first data for the second wireless terminal. ### Claim 7 (depends on 6) The method of claim 6, wherein initiating transmission of the first frame comprises initiating transmission of the first data for the first wireless terminal using a first data resource of the first data block and initiating transmission of the first data for the second wireless terminal using a second data resource of the first data block, and wherein the first and second data resources are different. ### Claim 8 (depends on 7) The method of claim 7, wherein the first data resource of the first data block is orthogonal with respect to the second data resource of the first data block in at least one of time and/or frequency, and wherein deferring transmission to the first wireless terminal comprises deferring transmission using the first data resource. ### Claim 9 (depends on 6) The method of claim 6, wherein initiating transmission of the first frame comprises initiating transmission of the first data for the first wireless terminal and the first data for the second wireless terminal using a same time and frequency resource. ### Claim 10 (depends on 9) The method of claim 9, wherein providing the first frame comprises providing padding for at least one of the first data for the first wireless terminal and the second data for the second wireless terminal to provide that the first data for the first wireless terminal and the second data for the second wireless terminal occupy a same time and frequency resource during transmission. ### Claim 11 (depends on 3) The method of claim 3, wherein the first control field indicates a first feedback resource corresponding to the first wireless terminal, wherein the second control field indicates a second feedback resource corresponding to the second wireless terminal, wherein the third control field indicates a third feedback resource corresponding to the third wireless terminal, and wherein the first, second, and third feedback resources are different. ### Claim 12 (depends on 11) The method of claim 11, wherein the second data block includes new data for the second wireless terminal responsive to receiving an acknowledgment from the second wireless terminal using the second feedback resource, and wherein the second data block includes previously transmitted data of the first frame for the third wireless terminal responsive to receiving a negative acknowledgement from the third wireless terminal using the third feedback resource. ### Claim 13 (depends on 11) The method of claim 11, wherein the first feedback resource is orthogonal with respect to the second and third feedback resources in at least one of time and/or frequency, wherein the second feedback resource is orthogonal with respect to the first and third feedback resources in at least one of time and/or frequency, and wherein the third feedback resource is orthogonal with respect to the first and second feedback resources in at least one of time and/or frequency. ### Claim 14 (depends on 11) The method of claim 11, wherein the first, second, and third feedback resources are defined using respective different beams and/or codes. ### Claim 15 (depends on 3) The method of claim 3, wherein the first data includes first data for the first wireless terminal and first data for the second wireless terminal, wherein the first data for the first wireless terminal is different than the first data for the second wireless terminal, and wherein initiating transmission of the first frame comprises initiating transmission of the first data for the first wireless terminal using the first beam and initiating transmission of the first data for the second wireless terminal using the second beam. ### Claim 16 (depends on 1) The method of claim 1, wherein initiating transmission of the first frame comprises initiating transmission of the same first data to the first and second wireless terminals. ### Claim 17 (depends on 1) The method of claim 1, wherein the notification message comprises a notify-to-send message received from an interfered wireless terminal. ### Claim 18 (depends on 1) The method of claim 1, wherein the first control field includes a first beam identification for the first beam, wherein the second control field includes a second beam identification for the second beam, and wherein the notification message includes the first beam identification. ### Claim 19 (depends on 1) The method of claim 1, further comprising: before initiating transmission of the first frame, performing a clear channel assessment of a frequency to be used to transmit the first frame; and wherein initiating transmission of the first frame comprises initiating transmission of the first frame responsive to a determination that the frequency is clear of interfering transmissions. ### Claim 20 An access node comprising: a transceiver configured to provide wireless communications in a wireless communication network; and a processor coupled with the transceiver, wherein the processor is configured to provide wireless communication through the transceiver, and wherein the processor is configured to, provide a first frame including a first header and a first data block with first data for first wireless terminal and second wireless terminal, wherein the header includes a first control field indicating a first idle period resource and a second control field indicating a second idle period resource, wherein the first and second idle period resources are different; initiate transmission of the first frame to the first and second wireless terminals; provide a second frame including a second header and a second data block with second data for the second wireless terminal responsive to receiving a notification message using the first idle period resource; and initiate transmission of the second frame to the second wireless terminal while deferring transmission to the second first wireless terminal. ### Claim 21 A method of operating a wireless terminal in a wireless communication network, the method comprising: responsive to interference from an interfering access node, receiving first and second control fields of a header of an interfering frame wherein the first control field indicates a first idle period resource and the second control field indicates a second idle period resource, wherein the first and second idle period resources are different; based on the interference from the interfering access node, selecting the first idle period resource; responsive to selecting the first idle period resource, transmitting a notification message to the interfering access node using the first idle period resource; and after transmitting the notification message, receiving a plurality of data frames from a serving access node. ### Claim 22 (depends on 21) The method of claim 21, further comprising: after receiving the plurality of data frames from the serving access node, receiving a notification message from the interfering access node; and responsive to receiving the notification message, transmitting a notify-not-to-send message to the serving access node. ### Claim 23 (depends on 21) The method of claim 21, wherein the first control field includes a first beam identification, wherein the second control field includes a second beam identification, and wherein the notification message includes the first beam identification. ### Claim 24 (depends on 21) The method of claim 21, further comprising: before receiving the first and second control fields, failing to decode a downlink communication from the serving access node using a frequency resource; responsive to failing to decode the downlink communication, listening for interfering frames using the frequency resource; and wherein receiving the first and second control fields comprises receiving the first and second control fields responsive to listening for interfering frames. ### Claim 25 A wireless terminal comprising: a transceiver configured to provide wireless communications in a wireless communication network; and a processor coupled with the transceiver, wherein the processor is configured to provide wireless communication through the transceiver, and wherein the processor is configured to, receive first and second control fields of a header of an interfering frame responsive to interference from an interfering access node, wherein the first control field indicates a first idle period resource and the second control field indicates a second idle period resource, wherein the first and second idle period resources are different; select the first idle period resource based on the interference from the interfering access node; transmit a notification message to the interfering access node using the first idle period resource responsive to selecting the first idle period resource; and receive a plurality of data frames from a serving access node after transmitting the notification message.