# US 2018/0027608 A1 · Frame transmission method performed in access point, frame reception method performed in terminal, and access point > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027608 A1 - Document ID: US20180027608A1 - Status: Published application - Kind: A1 - Application number: 15/722,492 - Filed: 2017-10-02 - Published: 2018-01-25 - Earliest claimed: 2013-12-20 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Jin Hyung OH; Gwang Zeen KO; Hyun Duk KANG; Igor KIM; Myung Sun SONG - Web page: https://patentgrep.com/patent/US20180027608A1 ## CPC - H04W 80/02: Data link layer protocols - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 72/00: Local resource management - 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) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Provided are a frame transmission method performed in an access point (AP), a frame reception method performed in a terminal, and an AP. The frame transmission method performed in an AP includes acquiring a channel for transmitting a first data unit of a first terminal, when a data unit to be transmitted to at least one terminal other than the first terminal is in the AP, generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) including the first data unit and the data unit to be transmitted to the at least one terminal, and transmitting the PPDU to the first terminal and the at least one terminal. Accordingly, it is possible to improve the performance of a wireless local area network (WLAN). ## Claims ### Claim 1 An operation method performed in an access point (AP), the operation method comprising: generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) including a plurality of data units; and transmitting the PPDU based on an orthogonal frequency division multiple access (OFDMA) manner, wherein the plurality of data units includes a first data unit for a first station and a second data unit for a second station, the first data unit and the second data unit are multiplexed in a frequency domain, and a padding is appended to each of the first data unit and the second data unit so that a length of a first payload including the first data unit is configured to be identical with a length of a second payload including the second data unit. ### Claim 2 (depends on 1) The operation method of claim 1, wherein the PPDU is transmitted based on a multiple-input multiple-output (MIMO) manner. ### Claim 3 (depends on 1) The operation method of claim 1, wherein the PPDU includes a signal (SIG) field which is divided into a SIG A field and a SIB B field. ### Claim 4 (depends on 3) The operation method of claim 3, wherein the SIG field includes information indicating a first frequency channel in which the first data unit is transmitted and information indicating a second frequency channel in which the second data unit is transmitted. ### Claim 5 (depends on 3) The operation method of claim 3, wherein the SIG field includes first identifier of the first station and a second identifier of the second station. ### Claim 6 (depends on 5) The operation method of claim 5, wherein the first identifier is a first association identifier (AID) of the first station and the second identifier is a second AID of the second station. ### Claim 7 (depends on 1) The operation method of claim 1, further comprises: receiving a first acknowledgement (ACK) frame in response to the first data unit from the first station; and receiving a second ACK frame in response to the second data unit from the second station. ### Claim 8 (depends on 7) The operation method of claim 7, wherein the first ACK frame and the second ACK frame are received based on the OFDMA manner. ### Claim 9 An operation method performed in a first station, the operation method comprising: receiving, from an access point (AP), a physical layer convergence procedure (PLCP) protocol data unit (PPDU) including a signal (SIG) field and a plurality of data units based on an orthogonal frequency division multiple access (OFDMA) manner; and obtaining a first data unit for the first station among the plurality of data units based on information indicated by the SIG field, wherein the plurality of data units includes the first data unit and a second data unit for a second station, the first data unit and the second data unit are multiplexed in a frequency domain, and a padding is appended to each of the first data unit and the second data unit so that a length of a first payload including the first data unit is configured to be identical with a length of a second payload including the second data unit. ### Claim 10 (depends on 9) The operation method of claim 9, wherein the PPDU is received based on a multiple-input multiple-output (MIMO) manner. ### Claim 11 (depends on 9) The operation method of claim 9, wherein the SIG field includes a SIG A field and a SIB B field. ### Claim 12 (depends on 9) The operation method of claim 9, wherein the SIG field includes information indicating a first frequency channel in which the first data unit is received and information indicating a second frequency channel in which the second data unit is received. ### Claim 13 (depends on 9) The operation method of claim 9, wherein the SIG field includes a first identifier of the first station and a second identifier of the second station. ### Claim 14 (depends on 13) The operation method of claim 13, wherein the first identifier is a first association identifier (AID) of the first station and the second identifier is a second AID of the second station. ### Claim 15 (depends on 9) The operation method of claim 9, further comprises: transmitting, to the AP, a first acknowledgement (ACK) frame in response to the first data unit.