# US 12,004,216 B2 · Apparatus and methods for TB PPDU alignment for multi-link triggered uplink access in a wireless network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,216 B2 - Document ID: US12004216B2 - Status: Granted - Kind: B2 - Application number: 18/092,905 - Filed: 2023-01-03 - Published: 2023-05-11 - Granted: 2024-06-04 - Earliest claimed: 2019-10-30 - Assignees: MediaTek Singapore Pte. Ltd. - Applicants: MediaTek Singapore Pte. Ltd. - Inventors: Yongho Seok; James Chih-Shi Yee - Web page: https://patentgrep.com/patent/US12004216B2 ## CPC - H04W 74/0816: with collision avoidance - H04L 1/0007: {by modifying the frame length} - H04L 1/1607: Details of the supervisory signal - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 80/02: Data link layer protocols - H04B 7/0413: MIMO systems - H04L 5/0023: {Time-frequency-space} - H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04L 27/2601: {Multicarrier modulation systems} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract Embodiments of the present invention prevent interference caused by the simultaneous transmission and reception of data in a constrained multi-link operation of a wireless network. According to one embodiment, a frame from a first affiliated AP of a multi-band wireless AP is transmitted for receipt by an STA, and a second affiliated wireless AP of the multi-band wireless AP is scheduled to transmit a trigger frame to the wireless STA over a second wireless link. Accordingly, the trigger frame is transmitted from the second affiliated wireless AP to the wireless STA over the second wireless link, and the response frame solicited by the frame is scheduled for transmission after the predetermined value has expired following an end of the PPDUs containing the trigger frame. ## Claims ### Claim 1 A method of data transmission in a wireless network, the method comprising: transmitting a frame from a first affiliated wireless access point (AP) of a multi-band wireless AP for receipt by a wireless station (STA), wherein the transmitting performed over a first wireless link, and the frame solicits a response frame; determining that a second affiliated wireless AP of the multi-band wireless AP is scheduled to transmit a trigger frame to the wireless STA over a second wireless link, the trigger frame comprising a carrier sense (CS) required field having a predetermined value; and transmitting the trigger frame from the second affiliated wireless AP for receipt by the wireless STA over the second wireless link, wherein the response frame solicited by the frame is scheduled for transmission after the predetermined value has expired following an end of a physical layer conformance procedure (PLCP) protocol data units (PPDUs) which contains the trigger frame. ### Claim 2 (depends on 1) The method as described in claim 1, further comprising determining that a difference between a starting time of a PPDU transmitted by the wireless STA in response to the frame and an ending time of the PPDU containing the trigger frame is equal to or greater than a period defined as: aSIFSTime+aSignalExtension−aRxTxTurnaroundTime. ### Claim 3 (depends on 1) The method as described in claim 1, further comprising determining that a difference between a starting time of a PPDU transmitted by the wireless STA in response to the trigger frame and an ending time of the PPDU containing the trigger frame is equal to or greater than 12 μs. ### Claim 4 (depends on 1) The method as described in claim 1, wherein the wireless STA comprises a non-simultaneous transmit and receive (NSTR) wireless STA. ### Claim 5 (depends on 1) The method of claim 1, wherein the first wireless link comprises a 6 GHz wireless link and the second wireless link comprises a 5 GHz wireless link. ### Claim 6 A method of data transmission in a wireless network, the method comprising: receiving a first trigger frame and a second trigger frame from a wireless access point (AP) at a wireless station (STA) over a first wireless link and a second wireless link, respectively, wherein the first trigger frame and the second trigger frame solicit data frames that overlap; calculating a difference between an ending time of a first physical layer conformance procedure (PLCP) protocol data unit (PPDU) carrying the first trigger frame and an ending time of a second PPDU carrying the second trigger frame; and transmitting a first data frame and a second data frame responsive to the first trigger frame and the second trigger frame over the first wireless link and the second wireless link, respectively, wherein at least a portion the first data frame and the second data frame overlap in time, wherein the first data frame and the second data frame are transmitted when a difference between the ending time of the first PPDU and the ending time of the second PPDU is greater than a predetermined value. ### Claim 7 (depends on 6) The method of claim 6, wherein the predetermined value comprises at least one of: 4 μs; 8 μs; and 16 μs. ### Claim 8 (depends on 7) The method of claim 7, wherein the first PPDU and the second PPDU are formatted using one of: a non-high throughput (HT); an HT; a very high throughput (VHT); and an extremely high throughput (EHT) format. ### Claim 9 (depends on 7) The method of claim 7, further comprising adjusting the ending time of the first PPDU by adjusting a media access control (MAC) padding of the first PPDU. ### Claim 10 (depends on 9) The method of claim 9, wherein the adjusting the ending time of the first PPDU substantially mitigates in-device coexistence interference. ### Claim 11 (depends on 7) The method of claim 7, further comprising adjusting the ending time of the first PPDU by adjusting a PHY padding of the first PPDU. ### Claim 12 (depends on 7) The method of claim 7, further comprising adjusting the ending time of the first PPDU by adjusting a packet extension (PE) frame of the first PPDU. ### Claim 13 (depends on 6) The method of claim 6, further comprising calculating a difference between an ending time of a first physical layer conformance procedure (PLCP) protocol data unit (PPDU) carrying the first trigger frame and an ending time of a second PPDU carrying the second trigger frame, wherein the first data frame and the second data frame are transmitted when a difference between the ending time of the first PPDU and the ending time of the second PPDU is greater than a short interframe space (SIFS)— (10%×aSlotTime), and wherein aSlotTime is determined according to a specification of the wireless network. ### Claim 14 (depends on 6) The method of claim 6, wherein the first wireless link comprises a 6 GHz wireless link and the second wireless link comprises a 5 GHz wireless link. ### Claim 15 (depends on 6) The method of claim 6, wherein the wireless STA is a non-simultaneous transmit and receive (NSTR) wireless STA. ### Claim 16 A wireless communication device comprising: a first transceiver and a second transceiver configured to send and receive data over the wireless network; and a processor operable to: cause the first transceiver to transmit a frame from a first affiliated wireless access point (AP) of a multi-band wireless AP for receipt by a wireless station (STA), wherein the transmitting performed over a first wireless link, and the frame solicits a response frame; determine that a second affiliated wireless AP of the multi-band wireless AP is scheduled to transmit a trigger frame to the wireless STA over a second wireless link, the trigger frame comprising a carrier sense (CS) required field having a predetermined value; and cause the second transceiver the trigger frame from the second affiliated wireless AP for receipt by the wireless STA over the second wireless link, wherein the response frame solicited by the frame is scheduled for transmission after the predetermined value has expired following an end of a physical layer conformance procedure (PLCP) protocol data units (PPDUs) which contains the trigger frame. ### Claim 17 (depends on 16) The wireless communication device as described in claim 16, wherein the processor is further operable to determine that a difference between a starting time of a PPDU transmitted by the wireless STA in response to the frame and an ending time of the PPDU containing the trigger frame is equal to or greater than a period defined as: aSIFSTime+aSignalExtension−aRxTxTurnaroundTime. ### Claim 18 (depends on 16) The wireless communication device as described in claim 16, wherein the processor is further operable to determine that a difference between a starting time of a PPDU transmitted by the wireless STA in response to the trigger frame and an ending time of the PPDU containing the trigger frame is equal to or greater than 12 μs. ### Claim 19 (depends on 16) The wireless communication device as described in claim 16, wherein the wireless STA comprises a non-simultaneous transmit and receive (NSTR) wireless STA. ### Claim 20 (depends on 16) The wireless communication device of claim 16, wherein the first wireless link comprises a 6 GHz wireless link and the second wireless link comprises a 5 GHz wireless link.