# US 12,192,153 B2 · Subcarrier indices for distributed-tone resource units in 6GHz low-power indoor systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,153 B2 - Document ID: US12192153B2 - Status: Granted - Kind: B2 - Application number: 17/511,801 - Filed: 2021-10-27 - Published: 2022-05-05 - Granted: 2025-01-07 - Earliest claimed: 2020-10-30 - Assignees: MediaTek Singapore Pte. Ltd. - Applicants: MediaTek Singapore Pte. Ltd. - Inventors: Shengquan Hu; Jianhan Liu; Thomas Edward Pare, Jr. - Web page: https://patentgrep.com/patent/US12192153B2 ## CPC - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04L 5/0066: {Requirements on out-of-channel emissions} - 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 Various schemes pertaining to subcarrier indices for distributed-tone resource units (RUs) in 6 GHz low-power indoor (LPI) systems are described. A communication entity distributes frequency tones of a RU over a distribution bandwidth as a distributed-tone RU (dRU). The communication entity also generates generating a plurality of subcarrier indices for the distributed-tone RU such that a distribution of the distributed-tone RU is symmetric or asymmetric to a direct-current (DC) tone along an axis of subcarrier indices. The communication entity then communicates wirelessly using the distributed-tone RU in a 6 GHz LPI system. ## Claims ### Claim 1 A method, comprising: distributing frequency tones of a resource unit (RU) over a distribution bandwidth as a distributed-tone RU (DRU); generating a plurality of subcarrier indices for the distributed-tone RU such that a distribution of the distributed-tone RU is symmetric to a direct-current (DC) tone along an axis of subcarrier indices; and communicating wirelessly using the distributed-tone RU in a 6 GHz low-power indoor (LPI) system, wherein the distributed-tone RU comprises a left-side portion and a right-side portion with respect to the DC tone, which is a center DC tone of a plurality of DC tones, and wherein the distributed-tone RU is symmetric to the center DC tone in which: the center DC tone is located symmetrically between the left-side portion and the right-side portion, a first pattern of tone distribution in the left-side portion and a second pattern of tone distribution in the right-side portion are symmetric with respect to the center DC tone, and the first pattern and the second pattern are opposite of each other in a two-dimensional (2D) space with one axis of DRU index in permutation order and another axis of subcarrier indices. ### Claim 2 (depends on 1) The method of claim 1, wherein the distributed-tone RU comprises a left-side or lower portion and a right-side or upper portion relative to the DC tone along the axis of subcarrier indices, and wherein the left-side portion is on a left side of the DC tone and the right-side portion is on a right side of the DC tone with an equal distance between the DC tone and the left-side portion as well as between the DC tone and the right-side portion. ### Claim 3 (depends on 1) The method of claim 1, wherein the generating of the plurality of subcarrier indices comprises generating edge-tone aligned and DC-symmetric subcarrier indices. ### Claim 4 (depends on 1) The method of claim 1, wherein the generating of the plurality of subcarrier indices comprises generating center aligned and DC-symmetric subcarrier indices. ### Claim 5 (depends on 1) The method of claim 1, wherein the generating of the plurality of subcarrier indices comprises generating edge-tone aligned and DC-asymmetric subcarrier indices. ### Claim 6 (depends on 1) The method of claim 1, wherein the generating of the plurality of subcarrier indices comprises generating center aligned and DC-asymmetric subcarrier indices. ### Claim 7 (depends on 1) The method of claim 1, wherein the distributed-tone RU is distributed over a 20 MHz bandwidth, and wherein the distributed-tone RU comprises a 26-tone DRU, a 52-tone DRU or a 106-tone DRU. ### Claim 8 (depends on 1) The method of claim 1, wherein the distributed-tone RU is distributed over a 40 MHz bandwidth, and wherein the distributed-tone RU comprises a 26-tone DRU, a 52-tone DRU, a 106-tone DRU or a 242-tone DRU. ### Claim 9 (depends on 1) The method of claim 1, wherein the distributed-tone RU is distributed over a 80 MHz bandwidth, and wherein the distributed-tone RU comprises a 26-tone DRU, a 52-tone DRU, a 106-tone DRU, a 242-tone DRU or a 484-tone DRU. ### Claim 10 (depends on 1) The method of claim 1, wherein the generating of the plurality of subcarrier indices comprises providing a set of subcarrier indices for a 26-tone DRU in a table such that, for a larger-sized DRU with more than 26 tones, the generating of the plurality of subcarrier indices further comprises generating another set of subcarrier indices for the larger-sized DRU from the table and using a DRU hierarchical structure with or without one or more extra tones as padding, and wherein: subcarrier indices for a 52-tone DRU are generated from corresponding two 26-tone DRUs, subcarrier indices for a 106-tone DRU are generated from either corresponding four 26-tone DRUs or corresponding two 52-tone DRUs with two extra tones as padding, subcarrier indices for a 242-tone DRU are generated from corresponding two 106-tone DRUs and one 26-tone DRU with four extra tones as padding, and subcarrier indices for a 484-tone DRU are generated from corresponding two 242-tone DRUs. ### Claim 11 A method, comprising: distributing frequency tones of a resource unit (RU) over a distribution bandwidth as a distributed-tone RU (DRU); generating a plurality of subcarrier indices for the distributed-tone RU such that a distribution of the distributed-tone RU is asymmetric to a direct-current (DC) tone along an axis of subcarrier indices; and communicating wirelessly using the distributed-tone RU in a 6 GHz low-power indoor (LPI) system, wherein the distributed-tone RU comprises a left-side portion and a right-side portion with respect to the DC tone, which is a center DC tone of a plurality of DC tones, and wherein the distributed-tone RU is asymmetric to the center DC tone in which: the center DC tone is located asymmetrically between the left-side portion and the right-side portion, a first pattern of tone distribution in the left-side portion and a second pattern of tone distribution in the right-side portion are asymmetric with respect to the center DC tone, and the first pattern and the second pattern are of a same pattern in a two-dimensional (2D) space with one axis of DRU index in permutation order and another axis of subcarrier indices. ### Claim 12 (depends on 11) The method of claim 11, wherein the distributed-tone RU comprises a left-side (or lower) portion and a right-side (or upper) portion relative to the DC tone along the axis of subcarrier indices, and wherein the left-side portion is on a left side of the DC tone and the right-side portion is on a right side of the DC tone with a first distance between the DC tone and the left-side portion and a second distance between the DC tone and the right-side portion different from the first distance. ### Claim 13 (depends on 11) The method of claim 11, wherein the generating of the plurality of subcarrier indices comprises generating edge-tone aligned and DC-symmetric subcarrier indices. ### Claim 14 (depends on 11) The method of claim 11, wherein the generating of the plurality of subcarrier indices comprises generating center aligned and DC-symmetric subcarrier indices. ### Claim 15 (depends on 11) The method of claim 11, wherein the generating of the plurality of subcarrier indices comprises generating edge-tone aligned and DC-asymmetric subcarrier indices. ### Claim 16 (depends on 11) The method of claim 11, wherein the generating of the plurality of subcarrier indices comprises generating center aligned and DC-asymmetric subcarrier indices. ### Claim 17 (depends on 11) The method of claim 11, wherein the distributed-tone RU is distributed over a 20 MHz bandwidth, and wherein the distributed-tone RU comprises a 26-tone DRU, a 52-tone DRU or a 106-tone DRU. ### Claim 18 (depends on 11) The method of claim 11, wherein the distributed-tone RU is distributed over a 40 MHz bandwidth, and wherein the distributed-tone RU comprises a 26-tone DRU, a 52-tone DRU, a 106-tone DRU or a 242-tone DRU. ### Claim 19 (depends on 11) The method of claim 11, wherein the distributed-tone RU is distributed over a 80 MHz bandwidth, and wherein the distributed-tone RU comprises a 26-tone DRU, a 52-tone DRU, a 106-tone DRU, a 242-tone DRU or a 484-tone DRU. ### Claim 20 (depends on 11) The method of claim 11, wherein the generating of the plurality of subcarrier indices comprises providing a set of subcarrier indices for a 26-tone DRU in a table such that, for a larger-sized DRU with more than 26 tones, the generating of the plurality of subcarrier indices further comprises generating another set of subcarrier indices for the larger-sized DRU from the table and using a DRU hierarchical structure with or without one or more extra tones as padding, and wherein: subcarrier indices for a 52-tone DRU are generated from corresponding two 26-tone DRUs, subcarrier indices for a 106-tone DRU are generated from either corresponding four 26-tone DRUs or corresponding two 52-tone DRUs with two extra tones as padding, subcarrier indices for a 242-tone DRU are generated from corresponding two 106-tone DRUs and one 26-tone DRU with four extra tones as padding, and subcarrier indices for a 484-tone DRU are generated from corresponding two 242-tone DRUs.