# US 2025/0168883 A1 · Synchronized framing scheduling methods and systems for ofdma based wireless systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0168883 A1 - Document ID: US20250168883A1 - Status: Published application - Kind: A1 - Application number: 19/027,726 - Filed: 2025-01-17 - Published: 2025-05-22 - Earliest claimed: 2021-09-22 - Assignees: Commtact LTD - Applicants: Commtact LTD - Inventors: Mark Altshuller - Web page: https://patentgrep.com/patent/US20250168883A1 ## CPC - H04W 74/0816: with collision avoidance - H04L 5/1469: {using time-sharing} - H04W 74/0891: {for synchronized access} - H04W 74/06: using polling - H04W 84/12: WLAN [Wireless Local Area Networks] - 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) ## Abstract There are provided methods and systems for scheduling downlink (DL) and uplink (UL) transmissions in one or more Point-to-Multipoint (PTMP) IEEE 802.11 orthogonal frequency division multiple access (OFDMA) based wireless communication networks, each network comprising one or more IEEE 802.11 OFDMA based Access Points (APs) wherein each AP of said one or more APs comprises associate one or more IEEE 802.11 OFDMA stations (STAs), the method comprising the steps of: synchronizing the one or more STAs within each network using one or more synchronization signals transmitted between the one or more APs and the one or more STAs; allocating one or more Framing Slots, wherein each Framing Slot having a fixed time duration; dividing each Framing Slot of said one or more Framing Slots into DL burst transmission and UL burst transmission periods wherein the DL burst transmission periods comprise one or more DL Data Units Bursts and continuously scheduling by said one or more IEEE 802.11 OFDMA based APs the one or more DL Data Units Bursts during said DL transmission period to said one or more STAs; and continuously sending said one or more UL Data Unit Bursts by said one or more STAs to said respective one or more APs. ## Claims ### Claim 1 A method for scheduling downlink (DL) and uplink (UL) transmissions in one or more orthogonal frequency division multiple access (OFDMA) based wireless communication networks, each network comprising one or more OFDMA based Access Points (APs) wherein each AP of said one or more APs comprises associated one or more OFDMA stations (STAs), the method comprising the steps of: synchronizing the one or more STAs within each network using one or more synchronization signals transmitted between the one or more APs and the one or more STAs; allocating one or more Framing Slots, wherein each Framing Slot having a fixed time duration; dividing each Framing Slot of said one or more Framing Slots into DL burst transmission and UL burst transmission periods wherein the DL burst transmission periods comprise one or more DL Data Units Bursts; continuously scheduling by said one or more OFDMA based APs the one or more DL Data Units Bursts during said DL transmission period to said one or more STAs; and continuously sending said one or more UL Data Unit Bursts by said one or more STAs to said respective one or more APs. ### Claim 2 (depends on 1) The method of claim 1 wherein each DL Data Unit Burst of said one or more DL Data Units Bursts comprises: DL PHY header comprising DL scheduling instructions to allocate one or more Resource Units (RUs) to said one or more STAs; DL MAC and Data as allocated in the allocated RUs per said one or more STAs as indicated in the DL PHY header; DL Trigger Frame comprising additional instructions for UL communication comprising RU allocation per said one or more STAs; Acknowledgment (Ack) or Block Acknowledgement (BAck) for a UL data transmission from said one or more STAs transmitted during previous Framing Slots; and wherein the UL burst transmission periods comprise one or more UL Data Units Bursts, wherein each UL Data Unit Burst of said one or more UL Data Units Bursts comprises: UL PHY Header comprising parameters as received in the DL Trigger Frame; UL MAC Header and Data allocated in RU as received in the DL trigger frame; Acknowledgment or Block Acknowledgement for the DL Data Units Bursts transmitted in the same or previous Framing Slots. ### Claim 3 (depends on 1) The method of claim 1, wherein the OFDMA based wireless communication networks are Point-to-Multipoint (PTMP) IEEE 802.11 orthogonal frequency division multiple access (OFDMA) based wireless communication networks and wherein the one or more APs are one or more IEEE 802.11 OFDMA based APs. ### Claim 4 (depends on 1) The method of claim 1 wherein the DL and UL burst transmission periods in the one or more Framing Slots have different time durations and wherein the time durations ratio between them defines TDD split. ### Claim 5 (depends on 1) The method of claim 1, wherein each of said UL Data Unit Bursts or said DL Data Unit Bursts may have different time length based on the one or more APs scheduling decision, and wherein the total time length of UL Data Unit Bursts cannot exceed the UL transmission period time and wherein the total time length of DL Data Unit Bursts cannot exceed the DL transmission period. ### Claim 6 (depends on 3) The method of claim 3, wherein said DL Data Unit Bursts or UL Data Unit Bursts comprises using PPDU 802.11 frames in the DL or UL direction. ### Claim 7 (depends on 1) The method of claim 1, comprising: communicating with any associated and non-associate STAs approaching said one or more APs using UORA (Uplink OFDMA Random Access) mechanism as in said DL Trigger Frame. ### Claim 8 (depends on 1) The method of claim 1, comprising allocating different RU of different STAs by different Data Units bursts. ### Claim 9 (depends on 1) The method of claim 1, comprising: generating one or more Multi-Frames, each said one or more Multi-Frames comprising a plurality of said one or more Framing Slots wherein each Framing Slot of said plurality Framing Slots is numbered and wherein one or more of said plurality Framing Slots is allocated as a Maintenance Framing Slot. ### Claim 10 (depends on 9) The method of claim 9 wherein said Maintenance Framing Slot comprising: information broadcasting, said information broadcasting comprises Framing Slot scheduling profile announcement per following Multi-Frame and beamforming training procedures within the Maintenance Framing Slot. ### Claim 11 (depends on 10) The method of claim 10, comprising: broadcasting the Multi-Frame duration by the one or more APs to the one or more STAs by the Maintenance Framing Slot to the following Multi-Frames to synchronize said Framing Slot sequence between the AP and STAs. ### Claim 12 (depends on 9) The method of claim 9, wherein the Multi-Frame is a semi-synchronous Multi-Frame for scheduling the DL and UL transmissions between the one or more APs and the one or more STAs and wherein the semi-synchronous Multi-Frame is configured to synchronize between the one or more APs and associated one or more STAs, but not synchronize between the one or more APs within the same network. ### Claim 13 An OFDMA based Access Point (AP) for scheduling one or more Framing Slots between the AP and a plurality of stations (STAs) in an orthogonal frequency division multiple access (OFDMA) based wireless communication network, said AP comprising: at least one synchronization source for time synchronization in said OFDMA wireless communication system; at least one transceiver used to transmit or receive wireless signals; and at least one processor in communication with said at least one transceiver, said processor is used to control the transceiver and wherein the processor comprises instructions to: synchronize the plurality of STAs within the network using one or more synchronization signals over the air transmitted between the AP and the plurality of STAs; allocate the one or more Framing Slots, wherein each Framing Slot of said one or more Framing Slots having a fixed time duration, and wherein each Framing Slot of the one or more Framing Slots is divided into DL burst transmission and UL burst transmission periods, wherein the DL burst transmission period comprises one or more DL Data Units Bursts and wherein the UL burst transmission period comprises one or more UL Data Units Bursts continuously schedule by said AP the one or more DL Data Units Bursts during said DL transmission period to said one or more STAs; and continuously send said one or more UL Data Unit Bursts by said one or more STAs to said AP. ### Claim 14 (depends on 13) The AP of claim 13, wherein the DL and UL burst transmission periods in the Framing Slot have different time durations and wherein the time durations ratio between them defines TDD split. ### Claim 15 (depends on 13) The AP of claim 13, wherein each of said UL Data Unit Bursts or said DL Data Unit Bursts may have different time length based on the AP scheduling decision, and wherein the total time length of the one or more UL Data Unit Bursts cannot exceed the UL transmission period time and wherein the total time length of DL Data Unit Bursts cannot exceed the DL transmission period. ### Claim 16 (depends on 13) The AP of claim 13, wherein the plurality of Framing Slots are scheduled in a Multi-Frame. ### Claim 17 (depends on 16) The AP of claim 16, wherein the plurality of Framing Slots in said Multi-Frame are numbered and wherein one or more of said plurality Framing Slots is allocated as a Maintenance Framing Slot. ### Claim 18 (depends on 16) The AP of claim 16 wherein the Multi-Frame is a semi-synchronous Multi-Frame. ### Claim 19 (depends on 13) The AP of claim 13, wherein each DL Data Unit of said one or more DL Data Units Bursts comprises: DL PHY header comprising DL scheduling instructions to allocate one or more Resource Units (RUs) to one or more STAs; DL MAC and Data as allocated in the allocated RUs per STAs as indicated in the DL PHY header; DL Trigger Frame with additional instructions for UL communication comprising RU allocation per STA; Acknowledgment (Ack) or Block Acknowledgement (BAck) for a UL data transmission from STAs transmitted during previous Framing Slots; and wherein each UL Data Unit Burst of said one or more UL Data Units Bursts comprises: UL PHY Header comprising parameters as received in the DL Trigger Frame; UL MAC Header and Data allocated in RU as received in the DL trigger frame; Acknowledgment or Block Acknowledgement for the DL Data Units Bursts transmitted in the same or previous Framing Slots. ### Claim 20 (depends on 13) The AP of claim 13, wherein the AP is an IEEE 802.11 OFDMA based AP and wherein the wireless communication network is a 802.11 orthogonal frequency division multiple access (OFDMA) based wireless communication network.