# US 11,909,530 B2 · Methods and WTRUs of providing range extension for WLAN > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,530 B2 - Document ID: US11909530B2 - Status: Granted - Kind: B2 - Application number: 17/421,611 - Filed: 2020-01-10 - Published: 2022-03-10 - Granted: 2024-02-20 - Earliest claimed: 2019-01-10 - Assignees: InterDigital Patent Holdings, Inc. - Applicants: InterDigital Patent Holdings, Inc. - Inventors: Xiaofei Wang; Hanqing Lou; Oghenekome Oteri; Li-Hsiang Sun - Web page: https://patentgrep.com/patent/US11909530B2 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1825: Adaptation of specific ARQ protocol parameters according to transmission conditions - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04W 74/004: {in the uplink, i.e. towards network} - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - 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 for use in a wireless transmit/receive unit (WTRU). The method comprises: receiving LRRE information from an AP; determining whether a first condition is satisfied by the WTRU, wherein the first condition is satisfied by the WTRU, on a condition that the first condition is satisfied, sending a mode change request to the AP to change an operation mode to a LRRE HARQ mode; receiving a response regarding the mode change request from the AP; and communicating with the AP using a plurality of PPDUs, each of the PPDUs comprising at least one field enabling transmissions between the WTRU and the AP under the first condition and a LRRE HARQ mode indication. ## Claims ### Claim 1 A method for use in a station (STA), the method comprising: receiving low rate range extension (LRRE) information from an access point (AP); and determining whether a first condition is satisfied, wherein on a condition that the first condition is satisfied, sending a mode change request to the AP to change an operation mode to a LRRE hybrid automatic repeat request (HARQ) mode; receiving a response to the mode change request from the AP; and communicating with the AP using a plurality of physical layer convergence procedure (PLCP) protocol data units (PPDUs), wherein each of the plurality of PPDUs comprises at least one field for enabling transmissions between the STA and the AP under the first condition and a LRRE HARQ mode indication. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one field comprises a plurality of fields for enabling transmissions in a 6 GHz band. ### Claim 3 (depends on 2) The method of claim 2, wherein the plurality of fields for enabling transmissions in the 6 GHz band comprise: at least one high efficient 6 GHz short training field (HE-6 GHz-STF), at least one HE 6 GHz long training field (HE-6 GHz-LTF), and at least one HE 6G Signal field (HE-6 GHz-SIG). ### Claim 4 (depends on 2) The method of claim 2, wherein the plurality of fields for enabling transmissions in the 6 GHz band comprise: at least one extremely high throughput 6 GHz short training field (EHT-6 GHz-STF), at least one EHT 6 GHz long training field (EHT-6 GHz-LTF), and at least one EHT 6 GHz signal field (EHT-6 GHZ-SIG). ### Claim 5 (depends on 1) The method of claim 1, wherein the at least one field comprises: at least one extremely high throughput short training field (EHT STF), at least one EHT long training field (EHT LTF), at least one EHT Signal field (EHT SIG), and at least one EHT mark field (EHT Mark). ### Claim 6 (depends on 1) The method of claim 1, wherein the first condition is a predetermined distance from the STA to the AP. ### Claim 7 (depends on 1) The method of claim 1, wherein the first condition is a predetermined channel quality value. ### Claim 8 (depends on 1) The method of claim 1, wherein the at least one field comprises a first subfield for indicating a generation of the PPDU. ### Claim 9 A station (STA), comprising: a receiver configured to receive low rate range extension (LRRE) information from an access point (AP); a transmitter; and a processer configured to determine whether a first condition is satisfied by the STA wherein on a condition that the first condition is satisfied: the transmitter is configured to send a mode change request to the AP to change an operation mode to a LRRE hybrid automatic repeat request (HARQ) mode; the receiver is further configured to receive a response to the mode change request from the AP; and the STA is configured to communicate with the AP using a plurality of physical layer convergence procedure (PLCP) protocol data units (PPDUs), wherein each of the plurality of PPDUs comprises at least one field enabling transmissions between the STA and the AP under the first condition and a LRRE HARQ mode indication. ### Claim 10 (depends on 9) The STA of claim 9, wherein the at least one field comprises a plurality of fields for enabling transmissions in a 6 GHz band. ### Claim 11 (depends on 10) The STA of claim 10, wherein the plurality of fields for enabling transmissions in the 6 GHz band comprise: at least one high efficient 6 GHz short training field (HE-6 GHz-STF), at least one HE 6 GHz long training field (HE-6 GHz-LTF), and at least one HE 6G Signal field (HE-6 GHz-SIG). ### Claim 12 (depends on 10) The STA of claim 10, wherein the plurality of fields for enabling transmissions in the 6 GHz band comprise: at least one extremely high throughput 6 GHz short training field (EHT-6 GHz-STF), at least one EHT 6 GHz long training field (EHT-6 GHz-LTF), and at least one EHT 6 GHz signal field (EHT-6 GHz-SIG). ### Claim 13 (depends on 9) The STA of claim 9, wherein the at least one field comprises: at least one extremely high throughput short training field (EHT STF), at least one EHT long training field (EHT LTF), at least one EHT Signal field (EHT SIG), and at least one EHT mark field (EHT Mark). ### Claim 14 (depends on 9) The STA of claim 9, wherein the first condition is satisfied when a current distance between the STA and the AP is greater than a distance value. ### Claim 15 (depends on 9) The STA of claim 9, wherein the first condition is satisfied when a channel quality of a channel used by the STA is less than a channel quality value. ### Claim 16 (depends on 9) The STA of claim 9, wherein the at least one field comprises a first subfield for indicating a generation of the PPDU.