# US 11,309,988 B2 · System and method for adaptive modulation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,988 B2 - Document ID: US11309988B2 - Status: Granted - Kind: B2 - Application number: 16/880,972 - Filed: 2020-05-21 - Published: 2020-09-10 - Granted: 2022-04-19 - Earliest claimed: 2013-01-11 - Assignees: InterDigital Patent Holdings, Inc. - Applicants: Interdigital Patent Holdings, Inc. - Inventors: Paul Marinier; J. Patrick Tooher; Ghyslain Pelletier; Marian Rudolf - Web page: https://patentgrep.com/patent/US11309988B2 ## CPC - H04L 1/0016: {involving special memory structures, e.g. look-up tables} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/1854: {Scheduling and prioritising arrangements} - 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 Systems, methods, and/or techniques for improving downlink spectrum efficiency may be disclosed. For example, a higher order modulation (HOM) transmission may be provided to a device. The higher order modulation transmission may be configured to be indicated by the network or a device. Additionally, multiple modulation and coding scheme (MCS) tables, transport block size (TBS) tables, and/or channel quality index (CQI) tables may be provided to support the higher order modulation transmission. ## Claims ### Claim 1 A wireless transmit/receive unit (WTRU), comprising: a processor configured to: receive a physical downlink control channel (PDCCH) transmission comprising scheduling information for a downlink shared channel transmission; determine a modulation and coding scheme (MCS) for the downlink shared channel transmission based on a first set of MCS values or a second set of MCS values, wherein the first set of MCS values comprises at least one MCS value corresponding to a modulation order of QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), or 64QAM, wherein the second set of MCS values comprises at least one MCS value corresponding to a modulation order of 256QAM, and wherein whether the first or second set of MCS values is used to determine the MCS is based on at least one of a scrambling identity associated with the PDCCH transmission, a format of the PDCCH transmission, or a search space associated with the PDCCH transmission; and decode the downlink shared channel transmission based on the determined MCS. ### Claim 2 (depends on 1) The WTRU of claim 1, wherein at least one of the first set of MCS values or the second set of MCS values is configured for the WTRU by a network. ### Claim 3 (depends on 1) The WTRU of claim 1, wherein the scrambling identity comprises a cell radio network temporary identifier (C-RNTI). ### Claim 4 (depends on 3) The WTRU of claim 3, wherein the processor is configured to: determine the MCS for the downlink shared channel transmission based on the first set of MCS values if a cyclic redundancy check (CRC) of the PDCCH transmission is scrambled with a first radio network temporary identifier (RNTI) value; and determine the MCS for the downlink shared channel transmission based on the second set of MCS values if the CRC of the PDCCH transmission is scrambled with a second RNTI value. ### Claim 5 (depends on 1) The WTRU of claim 1, wherein the processor is further configured to: select a channel quality index (CQI) value for channel state information (CSI) reporting, wherein the CQI value is comprised in one of a plurality of sets of CQI values, wherein at least a first set of the plurality of sets of CQI values comprises CQI values mapped to a modulation order corresponding to QPSK, 16QAM, or 64QAM, and wherein at least a second set of the plurality of sets of CQI values comprises CQI values mapped to a modulation order corresponding to 256QAM. ### Claim 6 (depends on 5) The WTRU of claim 5, wherein the processor is further configured to receive a CSI reporting configuration indicating which one of the plurality of sets of CQI values is to be used for CSI reporting in a reporting instance. ### Claim 7 (depends on 6) The WTRU of claim 6, wherein the CSI reporting configuration further indicates which one of the plurality of sets of CQI values is to be used for periodic CSI reporting. ### Claim 8 (depends on 1) The WTRU of claim 1, wherein the PDCCH transmission comprises downlink control information. ### Claim 9 (depends on 1) The WTRU of claim 1, wherein the downlink shared channel transmission is received over a subset of resource elements comprised in one or more resource block pairs, the one or more resource block pairs comprise a plurality of subcarriers, and the subset of resource elements are comprised in a subset of the plurality of subcarriers. ### Claim 10 (depends on 9) The WTRU of claim 9, wherein the one or more resource block pairs comprise a plurality of orthogonal frequency division multiplexing (OFDM) symbols, and the subset of resource elements are comprised in a subset of the plurality of OFDM symbols. ### Claim 11 A method implemented by a wireless transmit/receive unit (WTRU), the method comprising: receiving a physical downlink control channel (PDCCH) transmission comprising scheduling information for a downlink shared channel transmission; determining a modulation and coding scheme (MCS) for the downlink shared channel transmission based on a first set of MCS values or a second set of MCS values, wherein the first set of MCS values comprises at least one MCS value corresponding to a modulation order of QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), or 64QAM, wherein the second set of MCS values comprises at least one MCS value corresponding to a modulation order of 256QAM, and wherein whether the first or second set of MCS values is used to determine the MCS is based on at least one of a scrambling identity associated with the PDCCH transmission, a format of the PDCCH transmission, or a search space associated with the PDCCH transmission; and; decoding the downlink shared channel transmission based on the determined MCS. ### Claim 12 (depends on 11) The method of claim 11, wherein at least one of the first set of MCS values or the second set of MCS values is configured for the WTRU by a network. ### Claim 13 (depends on 11) The method of claim 11, wherein the scrambling identity comprises a cell radio network temporary identifier (C-RNTI). ### Claim 14 (depends on 13) The method of claim 13, wherein the MCS for the downlink shared channel transmission is determined based on the first set of MCS values if a cyclic redundancy check (CRC) of the PDCCH transmission is scrambled with a first radio network temporary identifier (RNTI) value, and wherein the MCS for the downlink shared channel transmission is determined based on the second set of MCS values if the CRC of the PDCCH transmission is scrambled with a second RNTI value. ### Claim 15 (depends on 11) The method of claim 11, further comprising: selecting a channel quality index (CQI) value for channel state information (CSI) reporting, wherein the CQI value is comprised in one of a plurality of sets of CQI values, wherein at least a first set of the plurality of sets of CQI values comprises CQI values mapped to a modulation order corresponding to QPSK, 16QAM, or 64QAM, and wherein at least a second set of the plurality of sets of CQI values comprises CQI values mapped to a modulation order corresponding to 256QAM. ### Claim 16 (depends on 15) The method of claim 15, further comprising receiving a CSI reporting configuration indicating which one of the plurality of sets of CQI values is to be used for CSI reporting in a reporting instance. ### Claim 17 (depends on 16) The method of claim 16, wherein the CSI reporting configuration further indicates which one of the plurality of sets of CQI values is to be used for periodic CSI reporting. ### Claim 18 (depends on 11) The method of claim 11, wherein the PDCCH transmission comprises downlink control information. ### Claim 19 (depends on 11) The method of claim 11, wherein the downlink shared channel transmission is received over a subset of resource elements comprised in one or more resource block pairs, the one or more resource block pairs comprise a plurality of subcarriers, and the subset of resource elements are comprised in a subset of the plurality of subcarriers. ### Claim 20 (depends on 19) The method of claim 19, wherein the one or more resource block pairs comprise a plurality of orthogonal frequency division multiplexing (OFDM) symbols, and the subset of resource elements are comprised in a subset of the plurality of OFDM symbols.