# US 11,445,438 B2 · Full-duplex communication method during target wake time service period in high efficient wireless lan network and station apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,438 B2 - Document ID: US11445438B2 - Status: Granted - Kind: B2 - Application number: 16/979,818 - Filed: 2019-03-12 - Published: 2021-02-25 - Granted: 2022-09-13 - Earliest claimed: 2018-03-12 - Assignees: Senscomm Semiconductor Co., Ltd. - Applicants: Senscomm Semiconductor Co., Ltd. - Inventors: Seung Ho Choo; Jin Won Kang; Sang Min Shim; DaeHong Kim - Web page: https://patentgrep.com/patent/US11445438B2 ## CPC - H04L 27/2602: {Signal structure} - H04L 5/1469: {using time-sharing} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 84/12: WLAN [Wireless Local Area Networks] - Y02D 30/70: in wireless communication networks - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A full-duplex communication method in a target wake time (TWT) service period of a high-efficiency wireless local area network (WLAN) is performed by a TWT responding station, and includes transmitting TWT schedule information to at least one TWT requesting station; transmitting information regarding a resource unit (RU) to the at least one TWT requesting station through a reference frame in a TWT service period (SP); receiving an uplink frame from the TWT requesting station in a time period determined on the basis of the reference frame through the RU; and transmitting a downlink frame to the TWT requesting station in a specific time duration of the time period. The uplink frame and the downlink frame are transmitted through the same channel. ## Claims ### Claim 1 A full-duplex communication method in a target wake time (TWT) service period of a high-efficiency wireless local area network (WLAN), the full-duplex communication method being performed by a TWT responding station, the method comprising: transmitting TWT schedule information to at least one TWT requesting station; transmitting information regarding a resource unit (RU) to the at least one TWT requesting station through a reference frame in a TWT service period (SP); receiving an uplink frame from the TWT requesting station in at a specific timing determined based on the reference frame through the RU; and transmitting a downlink frame to the TWT requesting station at the specific timing, wherein the uplink frame and the downlink frame synchronized at the specific timing are transmitted simultaneously in a same time period on a basis of the reference frame through a same channel, wherein a duration of a legacy part of the uplink frame and a duration of a legacy part of the downlink frame are same, and wherein the legacy part of the downlink frame includes a null field in which no signal is transmitted or another signal type is transmitted. ### Claim 2 (depends on 1) The full-duplex communication method of claim 1, wherein the TWT responding station pre-receives candidates channel information regarding temporary primary channel for the TWT SP from the TWT requesting station and determines the information regarding the RU for the temporary primary channel. ### Claim 3 (depends on 1) The full-duplex communication method of claim 1, wherein the TWT responding station receives full-duplex communication capability information from the at least one TWT requesting station and sets the TWT schedule information for the at least one TWT requesting station having a full-duplex communication capability. ### Claim 4 (depends on 3) The full-duplex communication method of claim 3, wherein the full-duplex communication capability information is delivered through an HE capability element. ### Claim 5 (depends on 1) The full-duplex communication method of claim 1, wherein the uplink frame is a High-Efficiency Trigger-Based (HE TB) PPDU. ### Claim 6 (depends on 1) The full-duplex communication method of claim 1, wherein the legacy part of the uplink frame includes a pre-HE modulated field of the uplink frame and a non-legacy part of the uplink frame includes an HE modulated field of the uplink frame, wherein a non-legacy part of the downlink frame includes an HE modulated field of the downlink frame, and wherein the specific timing is included in the same time period in which the HE modulated field of the uplink frame is received and the HE modulated field of the downlink frame is transmitted. ### Claim 7 (depends on 1) The full-duplex communication method of claim 1, wherein channel information for TWT SP is included in a channel information field of a TWT information element. ### Claim 8 A full-duplex communication method in a target wake time (TWT) service period of a high-efficiency wireless local area network (WLAN), the full-duplex communication method being performed by a TWT requesting station, the method comprising: entering a sleep mode; receiving a reference frame including information regarding a resource unit (RU) in a target channel for a TWT service period (SP) from a TWT responding station after waking up; transmitting an uplink frame to the TWT responding station at a specific timing determined on a basis of the reference frame through the RU; and receiving a downlink frame from the TWT responding station at the specific timing, wherein the uplink frame and the downlink frame synchronized at the specific timing are transmitted simultaneously in a same time period on a basis of the reference frame through a same channel, wherein a duration of a legacy part of the uplink frame and a duration of a legacy part of the downlink frame are same, and wherein the legacy part of the downlink frame includes a null field in which no signal is transmitted or another signal type is transmitted. ### Claim 9 (depends on 8) The full-duplex communication method of claim 8, wherein the TWT requesting station pre-transmits candidate channel information regarding temporary primary channel for the TWT SP to the TWT responding station, and the target channel is determined among candidate channels. ### Claim 10 (depends on 8) The full-duplex communication method of claim 8, wherein the uplink frame is a High-Efficiency Trigger-Based (HE TB) PPDU. ### Claim 11 (depends on 8) The full-duplex communication method of claim 8, wherein the legacy part of the uplink frame includes a pre-HE modulated field of the uplink frame and a non-legacy part of the uplink frame includes an HE modulated field of the uplink frame, wherein a non-legacy part of the downlink frame includes an HE modulated field of the downlink frame, and wherein the specific timing is included in the same time period in which the HE modulated field of the uplink frame is received and the HE modulated field of the downlink frame is transmitted. ### Claim 12 (depends on 8) The full-duplex communication method of claim 8, wherein the TWT requesting station transmits full-duplex communication capability information to the TWT responding station. ### Claim 13 (depends on 12) The full-duplex communication method of claim 12, wherein the full-duplex communication capability information is transmitted through an HE capability element. ### Claim 14 A station apparatus for performing full-duplex communication in a power saving mode of a high efficiency wireless local area network (WLAN), the station apparatus comprising: a communication device configured to receive a reference frame including information regarding a resource unit (RU) for a target wake time (TWT) service period (SP) from an access point (AP) in a WLAN network, receive a downlink frame from the AP at a specific timing, and transmit an uplink frame at the specific timing; and a processor configured to determine to switch into a wake-up mode in a specific time after entering a sleep mode at a TWT, determine the the specific timing from the reference frame, and process the downlink frame, wherein the reference frame is received in the wake-up mode, wherein the uplink frame and the downlink frame synchronized at the specific timing are transmitted simultaneously in a same time period on a basis of the reference frame through a same channel, wherein a duration of a legacy part of the uplink frame and a duration of a legacy part of the downlink frame are same, and wherein the legacy part of the downlink frame includes a null field in which no signal is transmitted or another signal type is transmitted. ### Claim 15 (depends on 14) The station apparatus of claim 14, wherein the communication device transmits a High-Efficiency Trigger-Based (HE TB) PPDU to the AP as the uplink frame. ### Claim 16 (depends on 14) The station apparatus of claim 14, wherein the legacy part of the uplink frame includes a pre-HE modulated field of the uplink frame and a non-legacy part of the uplink frame includes an HE modulated field of the uplink frame, wherein a non-legacy part of the downlink frame includes an HE modulated field of the downlink frame, and wherein the specific timing is included in the same time period in which the HE modulated field of the uplink frame is received and the HE modulated field of the downlink frame is transmitted. ### Claim 17 (depends on 14) The station apparatus of claim 14, wherein the communication device transmits an HE capability element including full-duplex communication capability information thereof to the AP.