# US 2021/0242997 A1 · Wireless communication method using trigger information, and wireless communication terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242997 A1 - Document ID: US20210242997A1 - Status: Published application - Kind: A1 - Application number: 17/239,596 - Filed: 2021-04-24 - Published: 2021-08-05 - Earliest claimed: 2015-08-20 - Assignees: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd. - Applicants: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd. - Inventors: Juhyung SON; Jinsam Kwak; Geonjung Ko - Web page: https://patentgrep.com/patent/US20210242997A1 ## CPC - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 1/1614: {using bitmaps} - H04L 1/1664: {the supervisory signal being transmitted together with payload signals; piggybacking} - H04L 1/1685: {the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal} - H04L 69/22: Parsing or analysis of headers - H04W 72/04: Wireless resource allocation - H04W 74/0833: Random access procedures, e.g. with 4-step access - 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 Provided is a wireless communication terminal that wirelessly communicates with a base wireless communication terminal. The wireless communication terminal includes: a transceiver; and a processor. The processor is configured to receive trigger information and data from the base wireless communication terminal by using the transceiver, and transmits ACK information indicating whether the data is received to the base wireless communication terminal based on the trigger information. The trigger information is information for triggering transmission of the wireless communication terminal. ## Claims ### Claim at position 1 1-20. (canceled) ### Claim 21 A base wireless communication terminal that wirelessly communicates with a plurality of wireless communication terminal, the base wireless communication terminal comprising: a transceiver; and a processor, wherein the processor is configured to: generate a trigger MPDU including trigger information which triggers an uplink (UL) transmission of a wireless communication terminal to the base wireless communication terminal, and includes information on a resource unit (RU) allocated for the UL transmission of the wireless communication terminal and information on a length of the UL transmission, transmit the PPDU including an Aggregate-MAC Protocol Data Unit (A-MPDU) comprising the trigger MPDU including the trigger information and one or more data MPDUs including data to the wireless communication terminal by using the transceiver, and receive ACK information indicating that the data is received, wherein the ACK information is transmitted from the wireless communication terminal based on the information on the RU and the information on the length of the UL transmission, wherein the A-MPDU is capable of including a plurality of trigger MPDUs including the trigger information. ### Claim 22 (depends on 21) The base wireless communication terminal of claim 21, when the A-MPDU includes the plurality of trigger MPDUs, each of the plurality of trigger MPDUs includes the same trigger information. ### Claim 23 (depends on 21) The base wireless communication terminal of claim 21, wherein when the A-MPDU includes the plurality of trigger MPDUs, the processor is configured to transmit one of the plurality of the trigger MPDUs first among the plurality of the trigger MPDUs and one or more data MPDUs. ### Claim 24 (depends on 21) The base wireless communication terminal of claim 21, wherein the processor is configured to insert the trigger information into a MAC header of the one or more data MPDUs. ### Claim 25 (depends on 21) The base wireless communication terminal of claim 21, wherein the processor is configured to set an ACK policy of the one or more data MPDUs to be a value which indicates that an immediate response is needed, and receive the ACK information, within a predetermined time from a time point at the end of transmitting the PPDU, simultaneously with receiving ACK information from the other wireless communication terminal. ### Claim 26 A wireless communication terminal that wirelessly communicates with a base wireless communication terminal, the wireless communication terminal comprising: a transceiver; and a processor, wherein the processor is configured to: receive, from the base wireless communication terminal, a PLCP Protocol Data Unit (PPDU) including an Aggregate-MAC Protocol Data Unit (A-MPDU) which includes a trigger MPDU including trigger information and one or more data MPDUs including data by using the transceiver, wherein the trigger information triggers an uplink (UL) transmission of the wireless communication terminal to the base wireless communication terminal, and includes information on a resource unit (RU) allocated for the UL transmission of the wireless communication terminal and information on a length of the UL transmission, obtain the trigger MPDU from the A-MPDU, and transmit ACK information indicating that the data is received to the base wireless communication terminal based on the information on the RU and the information on the length of the UL transmission, wherein the A-MPDU is capable of including a plurality of trigger MPDUs including the trigger information. ### Claim 27 (depends on 26) The wireless communication terminal of claim 26, when the A-MPDU includes the plurality of trigger MPDUs, each of the plurality of trigger MPDUs includes the same trigger information. ### Claim 28 (depends on 26) The wireless communication terminal of claim 26, wherein when the A-MPDU includes the plurality of trigger MPDUs, one of the plurality of trigger MPDUs is the first MPDU among the plurality of trigger MPDUs and one or more data MPDUs, wherein the processor is configured to obtain the trigger information from the first MPDU among the plurality of trigger MPDUs and one or more data MPDUs. ### Claim 29 (depends on 26) The wireless communication terminal of claim 26, wherein the one or more data MPDUs include a MAC header including the trigger information. ### Claim 30 (depends on 26) The wireless communication terminal of claim 26, wherein the trigger information comprises information indicating one or more RUs allocated to a random access, wherein the processor is configured to obtain a counter value randomly within a predetermined range, and determine whether to perform a random access based on the counter value and the number of the one or more RUs allocated to the random access. ### Claim 31 (depends on 26) The wireless communication terminal of claim 26, wherein the processor is configured to transmit the ACK information, through a RU indicated by the information on the RU, within a predetermined time from a time point at the end of receiving the PPDU. ### Claim 32 A method of operating a wireless communication terminal that wirelessly communicates with a base wireless communication terminal, the method comprising: receiving, from the base wireless communication terminal, a PLCP Protocol Data Unit (PPDU) including an Aggregate-MAC Protocol Data Unit (A-MPDU) which includes a trigger MPDU including trigger information and one or more data MPDUs including data, wherein the trigger information triggers an uplink (UL) transmission of the wireless communication terminal to the base wireless communication terminal, and includes information on a resource unit (RU) allocated for the UL transmission of the wireless communication terminal and the information on a length of the UL transmission, obtaining the trigger MPDU from the A-MPDU, and transmitting ACK information indicating that the data is received to the base wireless communication terminal based on the information on the RU and the information on the length of the UL transmission, wherein the A-MPDU is capable of including a plurality of trigger MPDUs including the trigger information. ### Claim 33 (depends on 32) The method of claim 32, when the A-MPDU includes the plurality of trigger MPDUs, each of the plurality of trigger MPDUs includes the same trigger information. ### Claim 34 (depends on 32) The method of claim 32, wherein when the A-MPDU includes the plurality of trigger MPDUs, one of the plurality of trigger MPDUs is the first MPDU among the plurality of trigger MPDUs and one or more data MPDUs, obtaining the trigger MPDU from the A-MPDU comprises obtaining the trigger information from the first MPDU among the plurality of trigger MPDUs and one or more data MPDUs.