# US 2021/0243689 A1 · Wireless access point and station applied in wireless communication system and communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243689 A1 - Document ID: US20210243689A1 - Status: Published application - Kind: A1 - Application number: 17/148,715 - Filed: 2021-01-14 - Published: 2021-08-05 - Earliest claimed: 2020-02-05 - Assignees: Realtek Semiconductor Corp. - Applicants: Realtek Semiconductor Corporation - Inventors: Cheng-Duom HSIAO; Hsuan-Yan Chung - Web page: https://patentgrep.com/patent/US20210243689A1 ## CPC - H04W 52/0206: {in access points, e.g. base stations} - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 52/0229: {where the received signal is a wanted signal} - H04W 52/0235: {where the received signal is a power saving command} - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04W 88/08: Access point devices - H04W 68/02: Arrangements for increasing efficiency of notification or paging channel - Y02D 30/70: in wireless communication networks - 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 wireless access point includes a memory and a processor. The processor is configured to access instructions stored in the memory, and execute the instructions to perform following steps: periodically transmitting a plurality of beacons to a station so that the station operates in a low power sleep mode or an active mode based on the beacons, in which the beacons includes two successive beacons; and, between the transmission of the two successive beacons, determining whether to transmit a management frame to the station based on a traffic condition of packets being directed to the station so that the station establishes a mode switching in response to the management frame. The traffic condition includes a channel state and a number or a validity of the packets. The mode switching includes switching from one of the low power sleep mode and the active mode to another. ## Claims ### Claim 1 A wireless access point applied in a wireless communication system, comprising: a memory, configured to store at least one instruction; a communication module; and a processor, coupled to the memory and the communication module, and configured to access and execute the at least one instruction for: periodically enabling the communication module to transmit a plurality of beacons to a station, so that the station is in an low power sleep mode or an active mode according to the beacons, wherein the beacons include a first beacon and a second beacon transmitted sequentially; and between transmitting the first beacon and transmitting the second beacon, determining whether to transmit a management frame to the station based on a traffic condition of at least one packet being directed to the station, so that the station switches from the low power sleep mode to the active mode or from the active mode to the low power sleep mode in response to the management frame, wherein the traffic condition includes a channel state and a number or a validity of the at least one packet. ### Claim 2 (depends on 1) The wireless access point of claim 1, wherein the processor is further configured to access and execute the at least one instruction for: transmitting at least one of the beacons which includes a confirmation message configured to confirm whether the station supports receiving the management frame; and if the station responds to the confirmation message with a acknowledge message, transmitting the management frame to the station according to the traffic condition. ### Claim 3 (depends on 2) The wireless access point of claim 2, wherein the processor is further configured to access and execute the at least one instruction for: receiving an upper threshold and a lower threshold attached to the acknowledge message; and comparing the traffic condition with one of the upper threshold and the lower threshold to determine whether to transmit the management frame. ### Claim 4 (depends on 3) The wireless access point of claim 3, wherein the processor comparing the channel state with one of the upper threshold and the lower threshold to determine whether to transmit the management frame comprises: if the channel state exceeds the upper threshold, transmitting the management frame to the station to switch the station from the low power sleep mode to the active mode; and if the channel state is lower than the lower threshold, transmitting the management frame to the station to switch the station from the active mode to the low power sleep mode. ### Claim 5 (depends on 1) The wireless access point of claim 1, wherein the processor is further configured to access and execute the at least one instruction for: if the validity matches a short validity, transmitting the management frame to the station to switch the station from the low power sleep mode to the active mode; and if the validity matches a long validity, transmitting the management frame to the station to switch the station from the active mode to the low power sleep mode. ### Claim 6 A station applied in a wireless communication system, comprising: a memory, configured to store at least one instruction; a communication module; and a processor, coupled to the memory and the communication module, and configured to access and execute the at least one instruction for: receiving a plurality of beacons transmitted by a wireless access point in the wireless communication system, and enabling the station to be in a low power sleep mode or an active mode according to the beacons, wherein the beacons include a first beacon and a neighboring second beacon; between receiving the first beacon and receiving the second beacon, determining whether a management frame is received from the wireless access point station, wherein the wireless access point determines whether to transmit the management frame according to a traffic condition of at least one packet being directed to the station, the traffic condition includes a channel state and a number or a validity of the at least one packet; and in response to the management frame, switching from the low power sleep mode to the active mode or from the active mode to the low power sleep mode. ### Claim 7 (depends on 6) The station of claim 6, wherein the processor is further configured to access and execute the at least one instruction for: determining whether at least one of the beacons includes a confirmation message, wherein the confirmation message is used by the wireless access point to confirm whether the station supports a reception of the management frame; and sending, by the communication module, a acknowledge message to the confirmation message to enable the wireless access point to transmit the management frame according to the traffic conditions. ### Claim 8 (depends on 7) The station of claim 7, wherein the processor is further configured to access and execute the at least one instruction for: receiving an upper threshold and a lower threshold attached to the acknowledge message; and comparing the traffic condition with one of the upper threshold and the lower threshold to determine whether to transmit the management frame. ### Claim 9 (depends on 8) The station of claim 8, wherein the processor comparing the channel state with one of the upper threshold and the lower threshold to determine whether to transmit the management frame comprises: if the channel state corresponding to the received management frame exceeds the upper threshold, controlling the station to switch from the low power sleep mode to the active mode; and if the channel state corresponding to the received management frame is lower than the upper threshold, controlling the station to switch from the active mode to the low power sleep mode. ### Claim 10 (depends on 6) The station of claim 6, wherein the processor is further configured to access and execute the at least one instruction for: if the received management frame corresponds to the validity matching a short validity, controlling the station to switch from the low power sleep mode to the active mode; and if the received management frame corresponds to the validity matching a long validity, controlling the station to switch from the active mode to the low power sleep mode. ### Claim 11 A communication method, used in a wireless access point and a station, wherein the communication method comprising: the wireless access point periodically transmitting a plurality of beacons to the station, so that the station is in an low power sleep mode or an active mode according to the beacons, wherein the beacons include a first beacon and a second beacon transmitted sequentially; between transmitting the first beacon and transmitting the second beacon, the wireless access point determining whether to transmit a management frame to the station based on a traffic condition of at least one packet being directed to the station, wherein the traffic condition includes a number or a validity of the at least one packet; and the station switches from the low power sleep mode to the active mode or from the active mode to the low power sleep mode in response to the management frame. ### Claim 12 (depends on 11) The communication method of claim 11, further comprising: the wireless access point transmitting at least one of the beacons which includes a confirmation message configured to confirm whether the station supports receiving the management frame; and if the station responds to the confirmation message with a acknowledge message to the wireless access point, the wireless access point transmitting the management frame to the station according to the traffic condition. ### Claim 13 (depends on 12) The communication method of claim 12, further comprising: the station attaching an upper threshold and a lower threshold in the acknowledge message; the wireless access point receiving the upper threshold and the lower threshold; and the wireless access point comparing the traffic condition with one of the upper threshold and the lower threshold to determine whether to transmit the management frame. ### Claim 14 (depends on 13) The communication method of claim 13, wherein the wireless access point comparing the traffic condition with one of the upper threshold and the lower threshold to determine whether to transmit the management frame comprises: if the wireless access point determines that the number is higher than the upper threshold, transmitting the management frame to the station to switch the station from the low power sleep mode to the active mode; and if the wireless access point determines that the number is lower than the lower threshold, transmitting the management frame to the station to switch the station from the active mode to the low power sleep mode. ### Claim 15 (depends on 11) The communication method of claim 11, further comprising: if the wireless access point determines that the validity matches a short validity, the wireless access point transmitting the management frame to the station to switch the station from the low power sleep mode to the active mode; and if the wireless access point determines that the validity matches a long validity, the wireless access point transmitting the management frame to the station to switch the station from the active mode to the low power sleep mode.