# US 11,451,348 B2 · Multi-user multiplexing of orthogonal time frequency space signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,348 B2 - Document ID: US11451348B2 - Status: Granted - Kind: B2 - Application number: 17/139,478 - Filed: 2020-12-31 - Published: 2021-04-29 - Granted: 2022-09-20 - Earliest claimed: 2016-08-12 - Assignees: Cohere Technologies, Inc. - Applicants: Cohere Technologies, Inc. - Inventors: Shachar Kons; Ronny Hadani; Yoav Hebron - Web page: https://patentgrep.com/patent/US11451348B2 ## CPC - H04L 5/0005: {Time-frequency} - H04J 4/00: Combined time-division and frequency-division multiplex systems (H04J13/00 takes precedence {; data transmission H04L5/26; telemetry G08C15/00}) - H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]} - H04L 5/0037: {Inter-user or inter-terminal allocation} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 23/02: adapted for orthogonal signalling - H04W 72/044: based on the type of the allocated resource - H04W 72/121: for groups of terminals or users - H04W 72/20: Control channels or signalling for resource management - G01S 7/41: using analysis of echo signal for target characterisation; Target signature; Target cross-section - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract A method for performing downlink transmissions from a transmitting device to multiple user devices using transmission resources from a multi-dimensional grid of resources is described. The method includes logically partitioning the transmission resources into multiple segments, assigning, to a given user device of the multiple user devices, transmission resources of one or more of the multiple segments, and performing, using at least some of the assigned transmission resources for the given user device, a downlink transmission using an orthogonal time frequency space (OTFS) transformation on data or signals to be transmitted to the given user device. ## Claims ### Claim 1 A wireless communication method for performing transmissions between a wireless device to multiple user devices, comprising: logically grouping the multiple user devices into a first group of user devices and a second group of user devices; allocating a first group of transmission resources to the first group of user devices and a second group of transmission resources to the second group of user devices by multiplexing along a first dimension of a first multi-dimensional representation of transmission resources; allocating, from the first group of transmission resources, transmissions resources to user devices in the first group by multiplexing along a second dimension in a second multi-dimensional representation of the transmission resources; and performing a transmission between the wireless device and at least one user device using corresponding allocated transmission resources. ### Claim 2 (depends on 1) The method of claim 1, wherein the first multi-dimensional representation comprises a time-frequency representation and the second multi-dimensional representation comprises a delay-Doppler representation. ### Claim 3 (depends on 2) The method of claim 2, wherein the first dimension of the first multi-dimensional representation comprises a frequency dimension. ### Claim 4 (depends on 2) The method of claim 2, wherein the first dimension of the first multi-dimensional representation comprises a time dimension. ### Claim 5 (depends on 2) The method of claim 2, wherein the second dimension of the second multi-dimensional representation comprises a delay dimension. ### Claim 6 (depends on 2) The method of claim 2, wherein the second dimension of the second multi-dimensional representation comprises a Doppler dimension. ### Claim 7 (depends on 2) The method of claim 2, wherein the transmission is performed from the wireless device to the at least one user device. ### Claim 8 (depends on 2) The method of claim 2, wherein the transmission is performed from the at least one user device to the wireless device. ### Claim 9 (depends on 1) The method of claim 1, wherein the first group of receiving devices includes one or more receiving devices and the second group of receiving devices includes one or more receiving devices. ### Claim 10 (depends on 1) The method of claim 1, wherein the transmissions include a reference signal that enables channel estimation by a given receiving device. ### Claim 11 (depends on 1) The method of claim 1, wherein the reference signal is based on an identity of the given transmitting device. ### Claim 12 (depends on 1) The method of claim 1, wherein the logical partitioning of the transmission resources is non-uniformly spaced in the multi-dimensional grid of resources. ### Claim 13 A wireless device comprising a processor configured to implement a method for wireless communication, comprising: logically grouping multiple user devices into a first group of user devices and a second group of user devices; allocating a first group of transmission resources to the first group of user devices and a second group of transmission resources to the second group of user devices by multiplexing along a first dimension of a first multi-dimensional representation of transmission resources; allocating, from the first group of transmission resources, transmissions resources to user devices in the first group by multiplexing along a second dimension in a second multi-dimensional representation of the transmission resources; and performing a transmission between the wireless device and at least one user device using corresponding allocated transmission resources. ### Claim 14 (depends on 13) The wireless device of claim 13, wherein the logical partitioning of the transmission resources is non-uniformly spaced in the multi-dimensional grid of resources. ### Claim 15 (depends on 13) The wireless device of claim 13, wherein the first multi-dimensional representation comprises a time-frequency representation and the second multi-dimensional representation comprises a delay-Doppler representation. ### Claim 16 (depends on 15) The wireless device of claim 15, wherein the first dimension of the first multi-dimensional representation comprises a frequency dimension or a time dimension and the second dimension of the second multi-dimensional representation comprises a delay dimension or a Doppler dimension. ### Claim 17 (depends on 13) The wireless device of claim 13, wherein the first group of receiving devices includes one or more receiving devices and the second group of receiving devices includes one or more receiving devices. ### Claim 18 (depends on 13) The wireless device of claim 13, wherein the transmission includes a reference signal that enables channel estimation by a given receiving device. ### Claim 19 (depends on 18) The wireless device of claim 18, wherein the reference signal is based on an identity of the given receiving device.