# US 10,455,556 B2 · Method and apparatus for changing operating mode 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 10,455,556 B2 - Document ID: US10455556B2 - Status: Granted - Kind: B2 - Application number: 15/424,629 - Filed: 2017-02-03 - Published: 2017-08-10 - Granted: 2019-10-22 - Earliest claimed: 2016-02-04 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyunhee Park; Kiseon Ryu; Jeongki Kim; Hangyu Cho; Suhwook Kim - Web page: https://patentgrep.com/patent/US10455556B2 ## CPC - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/06: using polling - H04B 7/0689: {using different transmission schemes, at least one of them being a diversity transmission scheme} - H04W 84/12: WLAN [Wireless Local Area 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) - H04B: TRANSMISSION ## Abstract This specification proposes a signal processing method for changing an operating mode for transmitting a PPDU in a wireless LAN system. More specifically, a first station transmits request information requesting for a change in the operating mode to a second station. The first station transmits a first PPDU supporting a first wireless LAN system to the second station based on the request information. The first station receives a Block ACK (BA) as a response to the first PPDU. The request information includes delay time information indication a time during which indication information is applied. ## Claims ### Claim 1 A method of processing control information for transmitting a physical layer protocol data unit (PPDU) in a wireless local area network (LAN) system, the method comprising: transmitting, by a first station, request information requesting a change in an operating mode to a second station; transmitting, by the first station, a first PPDU supporting a first wireless LAN system to the second station based on the request information; and receiving, by the first station, a Block ACK (BA) as a response to the first PPDU, wherein the request information includes first information on the change in the operating mode based on a number of spatial streams and a number of first channel bandwidths supported by the first station, and second information related with a time in which the first information is applied, wherein if the second information includes a predetermined value, the first information is applied to the first station and the second station after receiving the BA, and the first PPDU is transmitted by not applying the first information, wherein if the second information does not include the predetermined value, the first information is applied to the first station, the first information is not applied to the second station, the first PPDU is transmitted by the first station by applying the first information, the BA is received by the first station by not applying the first information, and the BA is received through a second PPDU supporting a second wireless LAN system supporting a second channel bandwidth, wherein the first PPDU is transmitted and the BA is received in a same transmission opportunity (TXOP), and wherein the second channel bandwidth is lowest receiving channel bandwidth among the first channel bandwidths. ### Claim 2 (depends on 1) The method of claim 1, wherein if the second information includes the predetermined value, an application of the first information is delayed until the reception of the BA. ### Claim 3 (depends on 1) The method of claim 1, wherein the first PPDU supporting the first wireless LAN system corresponds to a High Efficiency (HE) PPDU, and the second PPDU supporting the second wireless LAN system corresponds to a non-High Throughput (non-HT) PPDU. ### Claim 4 (depends on 1) The method of claim 1, further comprising: receiving, by the first station, a trigger frame for random access from the second station, wherein the first PPDU is transmitted in response to the trigger frame, and wherein the trigger frame is transmitted in the same TXOP. ### Claim 5 (depends on 1) The method of claim 1, wherein the request information is included in a data field of a third PPDU being delivered to the second station. ### Claim 6 (depends on 5) The method of claim 5, wherein the request information is included in a medium access control (MAC) header of the data field. ### Claim 7 (depends on 1) The method of claim 1, wherein the request information further includes third information which indicates whether or not the first station indicates Uplink Multi-User transmission (UL MU transmission), a number of receiving spatial streams supported by the first station, and a number of transmitting spatial streams supported by the first station. ### Claim 8 (depends on 1) The method of claim 1, wherein the first channel bandwidths include at least one of 20 MHz, 40 MHz, 80 MHz, or 160 MHz. ### Claim 9 (depends on 1) The method of claim 1, wherein the first station corresponds to a non-Access Point (AP) station, and wherein the second station corresponds to an AP station performing communication with the non-AP station. ### Claim 10 A first station of a wireless local area network (LAN) system, the first station comprising: a radio frequency (RF) unit transmitting and/or receiving radio signals; and a processor controlling the RF unit, wherein the processor is configured to: transmit request information requesting a change in an operating mode to a second station, transmit a first PPDU supporting a first wireless LAN system to the second station based on the request information, and receive a Block ACK (BA) as a response to the first PPDU, wherein the request information includes first information on the change in the operating mode based on a number of spatial streams and a number of first channel bandwidths supported by the first station, and second information related with a time in which the first information is applied, wherein if the second information includes a predetermined value, the first information is applied to the first station and the second station after receiving the BA, and the first PPDU is transmitted by not applying the first information, wherein if the second information does not include the predetermined value, the first information is applied to the first station, the first information is not applied to the second station, the first PPDU is transmitted by the first station by applying the first information, the BA is received by the first station by not applying the first information, and the BA is received through a second PPDU supporting a second wireless LAN system supporting a second channel bandwidth, wherein the first PPDU is transmitted and the BA is received in a same transmission opportunity (TXOP), and wherein the second channel bandwidth is lowest receiving channel bandwidth among the first channel bandwidths.