# US 12,225,481 B2 · Transmission power control for distributed-tone resource units and multi-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 12,225,481 B2 - Document ID: US12225481B2 - Status: Granted - Kind: B2 - Application number: 17/695,181 - Filed: 2022-03-15 - Published: 2022-09-29 - Granted: 2025-02-11 - Earliest claimed: 2021-03-19 - Assignees: MediaTek Singapore Pte. Ltd. - Applicants: MediaTek Singapore Pte. Ltd. - Inventors: Shengquan Hu; Jianhan Liu; Gary A. Anwyl; Thomas Edward Pare, Jr. - Web page: https://patentgrep.com/patent/US12225481B2 ## CPC - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 52/242: {taking into account path loss} - H04W 52/245: {taking into account received signal strength} - H04W 80/02: Data link layer protocols - H04W 84/10: Small scale networks; Flat hierarchical networks - 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 transmission power control (TPC) for distributed-tone resource units (dRUs) and distributed multi-resource units (dMRUs) in 6 GHz low-power indoor (LPI) systems are described. A communication entity distributes subcarriers of a resource unit (RU) and a multi-RU over a physical-layer protocol data unit (PPDU) bandwidth or a frequency subblock of a bandwidth to generate a dRU and a dMRU associated with an uplink (UL) trigger-based (TB) PPDU comprising at least an extremely-high-throughput (EHT) short training field (EHT-STF), an EHT long training field (EHT-LTF), and a payload of data. The communication entity then transmits the dRU or dMRU associated with the UL TB PPDU with transmission power control such that symbols associated with the EHT-STF are transmitted with a first power and symbols associated with the EHT-LTF and the payload are transmitted with a second power. ## Claims ### Claim 1 A method, comprising: distributing subcarriers of a resource unit (RU) or multi-resource unit (MRU) over a physical-layer protocol data unit (PPDU) bandwidth or a frequency subblock of a bandwidth to generate a distributed-tone RU (dRU) or distributed MRU (dMRU) associated with an uplink (UL) trigger-based (TB) PPDU comprising at least an extremely-high-throughput (EHT) short training field (EHT-STF), an EHT long training field (EHT-LTF), and a payload of data; and transmitting the dRU or dMRU associated with the UL TB PPDU with transmission power control (TPC) such that symbols associated with the EHT-STF are transmitted with a first power and symbols associated with the EHT-LTF and the payload are transmitted with a second power, wherein an actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: a downlink (DL) path loss (PL) plus a target received signal strength indicator (RSSI), a maximum allowed transmission power for the symbols associated with the EHT-LTF and the payload, and a maximum allowed transmission power in a 6 GHz low-power indoor (LPI) system. ### Claim 2 (depends on 1) The method of claim 1, wherein the first power and the second power are equal. ### Claim 3 (depends on 2) The method of claim 2, wherein the first power is limited to 10.76 dBm, 13.91 dBm, 16.92 dBm or 20.00 dBm over a 20 MHz bandwidth, a 40 MHz bandwidth, an 80 MHz bandwidth or a 160 MHz bandwidth, respectively. ### Claim 4 (depends on 2) The method of claim 2, wherein the actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: the DL PL plus the target RSSI, the maximum allowed transmission power for the symbols associated with the EHT-LTF and the payload, a maximum allowed transmission power for the symbols associated with the EHT-STF, and the maximum allowed transmission power in the 6 GHZ LPI system. ### Claim 5 (depends on 1) The method of claim 1, wherein the first power is less than or equal to the second power. ### Claim 6 (depends on 5) The method of claim 5, wherein the actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: the DL PL plus the target RSSI, a maximum allowed transmission power for the symbols associated with the EHT-STF, and the maximum allowed transmission power in the 6 GHz LPI system. ### Claim 7 (depends on 1) The method of claim 1, wherein the first power and the second power are same or different. ### Claim 8 (depends on 7) The method of claim 7, wherein, in an event that the first power is less than the second power, the actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: the DL PL plus the target RSSI, a maximum allowed transmission power for the symbols associated with the EHT-STF, and the maximum allowed transmission power in the 6 GHz LPI low-power indoor (LPI)-system. ### Claim 9 (depends on 7) The method of claim 7, wherein, in an event that the first power is less than the second power, the actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: the DL PL plus the target RSSI, the maximum allowed transmission power for the symbols associated with the EHT-LTF and the payload, a maximum allowed transmission power for the symbols associated with the EHT-STF plus an adjustment which is dependent upon a modulation coding scheme (MCS) and a number of spatial streams (Nss), and the maximum allowed transmission power in the 6 GHZ LPI system. ### Claim 10 An apparatus, comprising: a transceiver configured to transmit and receive wirelessly; and a processor coupled to the transceiver and configured to perform operations comprising: distributing subcarriers of a resource unit (RU) or a multi-RU (MRU) over a physical-layer protocol data unit (PPDU) bandwidth or a frequency subblock of a bandwidth to generate a distributed-tone RU (dRU) or a distributed MRU (dMRU) associated with an uplink (UL) trigger-based (TB) PPDU comprising at least an extremely-high-throughput (EHT) short training field (EHT-STF), an EHT long training field (EHT-LTF), and a payload of data; and transmitting, via the transceiver, the dRU or dMRU associated with the UL TB PPDU with transmission power control (TPC) such that symbols associated with the EHT-STF are transmitted with a first power and symbols associated with the EHT-LTF and the payload are transmitted with a second power, wherein an actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: a downlink (DL) path loss (PL) plus a target received signal strength indicator (RSSI), a maximum allowed transmission power for the symbols associated with the EHT-LTF and the payload, and a maximum allowed transmission power in a 6 GHz low-power indoor (LPI) system. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein, in an event that the first power and the second power are equal, the actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: the DL PL plus the target RSSI, the maximum allowed transmission power for the symbols associated with the EHT-LTF and the payload, a maximum allowed transmission power for the symbols associated with the EHT-STF, and the maximum allowed transmission power in the 6 GHz LPI system. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein the first power and the second power are equal. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein the first power is less than or equal to the second power. ### Claim 14 (depends on 10) The apparatus of claim 10, wherein, in an event that the first power is less than the second power, the actual transmission power of the dRU or dMRU associated with the UL TB PPDU is limited to a minimum among: the DL PL plus the target RSSI, the maximum allowed transmission power for the symbols associated with the EHT-LTF and the payload, a maximum allowed transmission power for the symbols associated with the EHT-STF plus an adjustment which is dependent upon a modulation coding scheme (MCS) and a number of spatial streams (Nss), and the maximum allowed transmission power in the 6 GHz LPI system. ### Claim 15 (depends on 10) The apparatus of claim 10, wherein the first power is greater than or equal to the second power.