# US 11,121,813 B2 · Method and system for wireless local area network (WLAN) long symbol duration migration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,813 B2 - Document ID: US11121813B2 - Status: Granted - Kind: B2 - Application number: 16/284,891 - Filed: 2019-02-25 - Published: 2019-06-20 - Granted: 2021-09-14 - Earliest claimed: 2015-03-06 - Assignees: InterDigital Patent Holdings, Inc. - Applicants: InterDigital Patent Holdings, Inc. - Inventors: Hanqing Lou; Oghenekome Oteri; Rui Yang; Robert L. Olesen; Guodong Zhang - Web page: https://patentgrep.com/patent/US11121813B2 ## CPC - H04L 1/0072: {Error control for data other than payload data, e.g. control data} - H04L 1/0079: {Formats for control data (H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00)} - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 2101/622: Layer-2 addresses, e.g. medium access control [MAC] addresses - 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) ## Abstract A method performed by an AP may comprise transmitting a MU-HE-PPDU, on a first 20 MHz channel and a second 20 MHz channel, to a plurality of STAs. The MU-HE-PPDU may comprise an HE-SIG-A portion carried on the first 20 MHz channel and the second 20 MHz channel. The MU-HE-PPDU may comprise a first HE-SIG-B portion carried on the first 20 MHz channel and a second HE-SIG-B portion carried on the second 20 MHz channel. ## Claims ### Claim 1 A method performed by an access point (AP), the method comprising: transmitting a multi user (MU) high efficiency (HE) physical layer convergence procedure (PLCP) protocol data unit (PPDU) (MU-HE-PPDU), on a first 20 megahertz (MHz) channel and a second 20 MHz channel, from the AP to a plurality of stations (STAs), wherein the MU-HE-PPDU comprises a high efficiency signal A (HE-SIG-A) portion carried on the first 20 MHz channel and the second 20 MHz channel, wherein the MU-HE-PPDU comprises a first high efficiency signal B (HE-SIG-B) portion carried on the first 20 MHz channel and a second HE-SIG-B portion carried on the second 20 MHz channel; wherein the HE-SIG A portion indicates a modulation and coding scheme (MCS) of the first HE-SIG-B portion and the second HE-SIG-B portion; wherein the first HE-SIG-B portion and the second HE-SIG-B portion comprise different information; wherein the first 20 Mhz channel and second 20 Mhz channel are different 20 Mhz channels. ### Claim 2 (depends on 1) The method of claim 1, wherein the first HE-SIG-B portion comprises a plurality of STA identifiers. ### Claim 3 (depends on 1) The method of claim 1, wherein the second HE-SIG-B portion comprises a STA identifier which is different than a STA identifier included in the first HE-SIG-B portion. ### Claim 4 (depends on 1) The method of claim 1, wherein the HE-SIG-A portion indicates a length of the first HE-SIG-B portion and the second HE-SIG-B portion. ### Claim 5 (depends on 1) The method of claim 1, wherein the first HE-SIG-B portion and the second HE-SIG-B portion are aligned in time. ### Claim 6 An access point (AP) comprising: a transmitter configured to transmit a multi user (MU) high efficiency (HE) physical layer convergence procedure (PLCP) protocol data unit (PPDU) (MU-HE-PPDU), from the AP to a plurality of stations (STAs), wherein the MU-HE-PPDU comprises a high efficiency signal A (HE-SIG-A) portion, the MU-HE-PPDU comprises a first high efficiency signal B (HE-SIG-B) portion and the MU-HE-PPDU comprises a second HE-SIG-B portion, wherein the first HE-SIG-B portion is transmitted on a first channel and the second HE-SIG-B portion is transmitted on a second channel which is different than the first channel; wherein the first HE-SIG-B portion includes one or more STA identifiers corresponding to one or more of the plurality of STAs. ### Claim 7 (depends on 6) The AP of claim 6, wherein the HE-SIG-A Portion is transmitted on the first channel and the second channel, wherein the MU-HE-PPDU occupies a bandwidth greater than the first channel and the second channel. ### Claim 8 (depends on 6) The AP of claim 6, wherein the first HE-SIG-B portion provides a different number of STA identifiers than the second HE-SIG-B portion. ### Claim 9 (depends on 6) The AP of claim 6, wherein the first HE-SIG-B portion comprises a common portion and a variable length user specific portion. ### Claim 10 (depends on 6) The AP of claim 6, wherein the first HE-SIG-B portion and the second HE-SIG-B portion are aligned in time. ### Claim 11 A station (STA) comprising: a receiver configured to receive, in a high efficiency (HE) signal A (HE-SIG-A) field of a multi user (MU) HE physical layer convergence procedure (PLCP) protocol data unit (PPDU) (MU-HE-PPDU), an indication of a modulation and coding scheme (MCS) of a high efficiency signal B (HE-SIG-B) field of the MU-HE-PPDU; the receiver configured to receive the HE-SIG-B field in accordance with the indicated MCS, wherein the HE-SIG-B field comprises a plurality of STA identifiers; and the receiver configured to receive data of the MU-HE-PPDU, wherein at least one of the STA identifiers of the HE-SIG-B field corresponds to an identifier of the STA. ### Claim 12 (depends on 11) The STA of claim 11, wherein the MCS of the HE-SIG-B field is higher than an MCS of the HE-SIG-A field. ### Claim 13 (depends on 11) The STA of claim 11, wherein the MCS of the HE-SIG-B field is the same as an MCS used for the receiving the HE-SIG-A field. ### Claim 14 (depends on 11) The STA of claim 11, wherein the HE-SIG-B field is decoded in accordance with the indicated MCS. ### Claim 15 (depends on 11) The STA of claim 11, wherein a transmission opportunity (TXOP) duration is determined via a SIG field of the MU-HE-PPDU. ### Claim 16 (depends on 11) The STA of claim 11, wherein the HE-SIG-B field spans more than one 20 MHz channel in frequency. ### Claim 17 (depends on 11) The STA of claim 11, wherein the decoding the HE-SIG-B field comprises determining a length of the HE-SIG-B field. ### Claim 18 (depends on 11) The STA of claim 11, wherein the decoding the HE-SIG-B field comprises determining a number of subfield of the HE-SIG-B field. ### Claim 19 A station (STA) comprising: a receiver configured to receive data of a multi user (MU) high efficiency (HE) physical layer convergence procedure (PLCP) protocol data unit (PPDU) (MU-HE-PPDU), sent from an access point (AP), wherein the MU-HE-PPDU comprises a high efficiency signal A (HE-SIG-A) portion, the MU-HE-PPDU comprises a first high efficiency signal B (HE-SIG-B) portion and the MU-HE-PPDU comprises a second HE-SIG-B portion, wherein the first HE-SIG-B portion is transmitted on a first channel and the second HE-SIG-B portion is transmitted on a second channel which is different than the first channel; wherein the first HE-SIG-B portion includes one or more STA identifiers. ### Claim 20 (depends on 19) The STA of claim 19, wherein the MU-HE-PPDU comprises a third HE-SIG-B portion and a fourth HE-SIG-B portion, wherein the third HE-SIG-B portion is transmitted on a third channel and the fourth HE-SIG-B portion is transmitted on a fourth channel, wherein the first channel, the second channel, the third channel and the fourth channel are different channels; wherein the HE-SIG-A portion indicates a modulation and coding scheme (MCS) of the first HE-SIG-B portion and the second HE-SIG-B portion.