# US 2014/0153469 A1 · Communication method in wireless local area network system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153469 A1 - Document ID: US20140153469A1 - Status: Published application - Kind: A1 - Application number: 14/232,804 - Filed: 2012-07-19 - Published: 2014-06-05 - Earliest claimed: 2011-07-19 - Assignees: LG Electronics Inc. - Inventors: Jong Hyun Park; Hyang Sun You; Eun Sun Kim; Yong Ho Seok - Web page: https://patentgrep.com/patent/US20140153469A1 ## CPC - H04W 52/0203: {in the radio access network or backbone network of wireless communication networks} - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04W 84/047: {using dedicated repeater stations} - 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 communication method performed by a target station in a WLAN system is provided. The method includes receiving a relayed TIM message from a relay station, the TIM message comprising a relayed TIM field indicating whether there is buffered traffic intended to be transmitted from an AP to the target station, determining whether there is the buffered traffic based on the relayed TIM field, receiving a data frame related to the buffered traffic, if the relayed TIM field indicates that there is the buffered traffic, and switching to a doze state, if the relayed TIM field indicates that there is no buffered traffic. The relayed TIM field is determined based on a TIM element transmitted from the AP to the relay station. The TIM element is transmitted in a first period, and the relayed TIM message is transmitted in a second period. ## Claims ### Claim 1 A communication method performed by a target station in a Wireless Local Area Network (WLAN) system, the communication method comprising: receiving a relayed Traffic Indication Map (TIM) message from a relay station, wherein the TIM message comprises a relayed TIM field indicating whether or not there is buffered traffic intended to be transmitted from an Access Point (AP) to the target station; determining whether or not there is the buffered traffic based on the relayed TIM field; receiving a data frame related to the buffered traffic, if the relayed TIM field indicates that there is the buffered traffic; and switching to a doze state, if the relayed TIM field indicates that there is no buffered traffic, wherein the relayed TIM field is determined based on a TIM element transmitted from the AP to the relay station, the TIM element is transmitted in a first period in which communication between the relay station and the AP is permitted, and the relayed TIM message is transmitted in a second period in which communication between the relay station and the target station is permitted. ### Claim 2 (depends on 1) The communication method of claim 1, wherein: the relayed TIM field comprises a bitmap sequence, and the bitmap sequence indicates whether or not there is the buffered traffic intended to be transmitted from the AP in relation to each station whose communication with the relay station is permitted for the second period. ### Claim 3 (depends on 2) The communication method of claim 2, wherein determining whether or not there is the buffered traffic based on the relayed TIM field comprises, determining whether a relevant bit of a bitmap sequence corresponding to the target station indicates the buffered traffic or not. ### Claim 4 (depends on 3) The communication method of claim 3, further comprising: transmitting a TIM relay request message requesting the relay station to transmit the relayed TIM message, to the relay station; and receiving a TIM relay response message from the relay station in response to the TIM relay request message. ### Claim 5 (depends on 4) The communication method of claim 4, wherein: the TIM relay response message comprises a relay identification information field, and the relay identification information field comprises identification information about the target station related to order of the relevant bit in the bitmap sequence. ### Claim 6 (depends on 5) The communication method of claim 5, wherein: the TIM relay request message comprises a requester identification information field, and the requester identification information field comprises an Association IDentifier (AID) allocated when the target station is associated with the AP. ### Claim 7 (depends on 6) The communication method of claim 6, wherein the identification information of the target station is determined based on the AID. ### Claim 8 (depends on 1) The communication method of claim 1, wherein the data frame is received from the AP. ### Claim 9 (depends on 8) The communication method of claim 8, wherein the data frame is received from the relay station. ### Claim 10 (depends on 9) The communication method of claim 9, wherein the data frame is received by the relay station from the AP for the first period and is relayed to the target station for the second period. ### Claim 11 (depends on 1) The communication method of claim 1, further comprising receiving a beacon frame from the AP, wherein the beacon frame comprises information indicating the first period and the second period. ### Claim 12 (depends on 1) The communication method of claim 1, wherein the relayed TIM message and the data frame are transmitted through a direct link set up between the target station and the relay station. ### Claim 13 (depends on 1) The communication method of claim 1, wherein maximum transmit power permitted for the second period is lower than maximum transmit power permitted for the first period. ### Claim 14 A wireless apparatus operated in a Wireless Local Area Network (WLAN) system, the wireless apparatus comprising: a transceiver configured to transmit and receive radio signals; and a processor functionally connected to the transceiver, wherein the process is configured to: receive a relayed Traffic Indication Map (TIM) message from a relay station, wherein the TIM message comprises a relayed TIM field indicating whether or not there is buffered traffic intended to be transmitted from an Access Point (AP) to the wireless apparatus; determine whether or not there is the buffered traffic based on the relayed TIM field; receive a data frame related to the buffered traffic, if the relayed TIM field indicates that there is the buffered traffic; and switch to a doze state, if the relayed TIM field indicates that there is no buffered traffic, wherein the relayed TIM field is determined based on a TIM element transmitted from the AP to the relay station, the TIM element is transmitted in a first period in which communication between the relay station and the AP is permitted, and the relayed TIM message is transmitted in a second period in which communication between the relay station and the wireless apparatus is permitted.