# US 2021/0242958 A1 · Dynamic transmission front end and digital-to-analog converter in modem > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242958 A1 - Document ID: US20210242958A1 - Status: Published application - Kind: A1 - Application number: 16/778,608 - Filed: 2020-01-31 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Igor Gutman; Shahin Mehdizad Taleie; Oren Matsrafi; Ronen Greenberger; Gal Keret; Yossi Waldman; Gideon Shlomo Kutz - Web page: https://patentgrep.com/patent/US20210242958A1 ## CPC - H04L 1/0003: {by switching between different modulation schemes} - H04W 52/262: {taking into account adaptive modulation and coding [AMC] scheme} - H03M 1/66: Digital/analogue converters ({H03M1/001 – } H03M1/10 take precedence) - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04W 52/146: {Uplink power control} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/0025: {Transmission of mode-switching indication} - 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) - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) ## Abstract Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a downlink control message from a base station indicating a modulation and coding scheme (MCS) associated with an uplink transmission, a number of layers associated with the uplink transmission, or both. The UE may determine to adjust (for example, reduce) a first number of bits based on the MCS, the number of layers, or both. The first number of bits may include an effective number of bits (ENOB) supported at a digital-to-analog converter (DAC) of the UE, a number of bits (NOB) supported at a transmission front end (TxFE) component of the UE, or both. The UE may transmit the uplink transmission to the base station according to the adjusted first number of bits. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving a downlink control message comprising at least one of a modulation and coding scheme associated with at least one uplink transmission or a number of layers associated with the at least one uplink transmission; determining to adjusted a first number of bits based at least in part on the at least one of the modulation and coding scheme or the number of layers, wherein the first number of bits comprises at least one of an effective number of bits supported at a digital-to-analog converter of the UE or a number of bits supported at a transmission front end component of the UE; and transmitting the at least one uplink transmission according to the adjusted first number of bits. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining to adjust a power consumption level of the UE, wherein determining to adjust the first number of bits is based at least in part on determining to adjust the power consumption level; and adjusting the power consumption level of the UE based at least in part on determining to adjust the power consumption level, wherein transmitting the at least one uplink transmission is based at least in part on adjusting the power consumption level. ### Claim 3 (depends on 1) The method of claim 1, wherein determining to adjust the first number of bits comprises: determining to adjust the effective number of bits supported at the digital-to-analog converter; and determining to adjust the number of bits supported at the transmission front end component. ### Claim 4 (depends on 3) The method of claim 3, further comprising adjusting a power consumption level of the UE based at least in part on reducing the effective number of bits supported at the digital-to-analog converter, or reducing the number of bits supported at the transmission front end component, or both, wherein transmitting the at least one uplink transmission is based at least in part on adjusting the power consumption level. ### Claim 5 (depends on 3) The method of claim 3, wherein a second number of bits adjusted from the effective number of bits supported at the digital-to-analog converter is the same as a third number of bits adjusted from the number of bits supported at the transmission front end component. ### Claim 6 (depends on 1) The method of claim 1, wherein determining to adjust the first number of bits comprises determining, based on the at least one of the modulation and coding scheme or the number of layers, a second number of bits by which to adjust the effective number of bits supported at the digital-to-analog converter and a third number of bits by which to adjust the number of bits supported at the transmission front end component. ### Claim 7 (depends on 6) The method of claim 6, wherein determining the second number of bits and the third number of bits comprises retrieving the second number of bits and the third number of bits based at least in part on the one or more of the modulation and coding scheme or the number of layers. ### Claim 8 (depends on 1) The method of claim 1, further comprising determining the at least one of the modulation and coding scheme or the number of layers based at least in part on the downlink control message, wherein determining to adjust the first number of bits is based at least in part on the determining. ### Claim 9 (depends on 1) The method of claim 1, wherein receiving the downlink control message comprises receiving downlink control information indicating the at least one of the modulation and coding scheme or the number of layers. ### Claim 10 (depends on 1) The method of claim 1, wherein one or more bits adjusted from the first number of bits are least significant bits of the first number of bits. ### Claim 11 (depends on 1) The method of claim 1, wherein determining to adjust the first number of bits is based at least in part on the at least one uplink transmission comprising a millimeter-wave transmission. ### Claim 12 (depends on 1) The method of claim 1, wherein determining to adjust the first number of bits is based at least in part on the at least one uplink transmission comprising a sub-6 gigahertz transmission. ### Claim 13 (depends on 1) The method of claim 1, wherein the effective number of bits comprises a second number of bits associated with a resolution of the digital-to-analog converter, and wherein the effective number of bits is less than the second number of bits associated with the resolution of the digital-to-analog converter. ### Claim 14 A method for wireless communication at a base station, comprising: establishing a communication link with a user equipment (UE); transmitting, to the UE, a downlink control message comprising at least one of a modulation and coding scheme associated with at least one uplink transmission or a number of layers associated with the at least one uplink transmission, wherein the at least one of the modulation and coding scheme or the number of layers indicate to adjust a first number of bits, wherein the first number of bits comprise at least one of an effective number of bits supported at a digital-to-analog converter of the UE or a number of bits supported at a transmission front end component of the UE; and receiving, from the UE, the at least one uplink transmission based at least in part on the at least one of the modulation and coding scheme or the number of layers indicating to adjust the first number of bits. ### Claim 15 (depends on 14) The method of claim 14, further comprising: determining that a signal to noise ratio (SNR) associated with a transmission of the UE is above a threshold amount; and transmitting the downlink control message based at least in part on the determining. ### Claim 16 (depends on 14) The method of claim 14, wherein the at least one of the modulation and coding scheme or the number of layers indicate a second number of bits by which to adjust the effective number of bits supported at the digital-to-analog converter and a third number of bits by which to adjust the number of bits supported at the transmission front end component. ### Claim 17 (depends on 14) The method of claim 14, wherein the effective number of bits comprises a second number of bits associated with a resolution of the digital-to-analog converter, and wherein the effective number of bits is less than the second number of bits associated with the resolution of the digital-to-analog converter. ### Claim 18 An apparatus for wireless communication at a user equipment (UE), comprising: a processor, memory in electronic communication with the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to: receive a downlink control message comprising at least one of a modulation and coding scheme associated with at least one uplink transmission or a number of layers associated with the at least one uplink transmission; determine to adjust a first number of bits based at least in part on the at least one of the modulation and coding scheme or the number of layers, wherein the first number of bits comprises at least one of an effective number of bits supported at a digital-to-analog converter of the UE or a number of bits supported at a transmission front end component of the UE; and transmit the at least one uplink transmission according to the adjusted first number of bits. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: determine to adjust a power consumption level of the UE, wherein determining to adjust the first number of bits is based at least in part on determining to adjust the power consumption level; and adjust the power consumption level of the UE based at least in part on determining to adjust the power consumption level, wherein transmitting the at least one uplink transmission is based at least in part on adjusting the power consumption level. ### Claim 20 (depends on 18) The apparatus of claim 18, wherein the instructions to determine to adjust the first number of bits are executable by the processor to cause the apparatus to: determine to adjust the effective number of bits supported at the digital-to-analog converter; and determine to adjust the number of bits supported at the transmission front end component. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to adjust a power consumption level of the UE based at least in part on reducing the effective number of bits supported at the digital-to-analog converter, or reducing the number of bits supported at the transmission front end component, or both, wherein transmitting the at least one uplink transmission is based at least in part on adjusting the power consumption level. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein a second number of bits adjusted from the effective number of bits supported at the digital-to-analog converter is the same as a third number of bits adjusted from the number of bits supported at the transmission front end component. ### Claim 23 (depends on 18) The apparatus of claim 18, wherein the instructions to determine to adjust the first number of bits are executable by the processor to cause the apparatus to determine, based on the at least one of the modulation and coding scheme or the number of layers, a second number of bits by which to adjust the effective number of bits supported at the digital-to-analog converter and a third number of bits by which to adjust the number of bits supported at the transmission front end component. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the instructions to determine the second number of bits and the third number of bits are executable by the processor to cause the apparatus to retrieve the second number of bits and the third number of bits based at least in part on the one or more of the modulation and coding scheme or the number of layers. ### Claim 25 (depends on 18) The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to determine the at least one of the modulation and coding scheme or the number of layers based at least in part on the downlink control message, wherein determining to adjust the first number of bits is based at least in part on the determining. ### Claim 26 (depends on 18) The apparatus of claim 18, wherein the instructions to receive the downlink control message are executable by the processor to cause the apparatus to receive downlink control information indicating the at least one of the modulation and coding scheme or the number of layers. ### Claim 27 (depends on 18) The apparatus of claim 18, wherein one or more bits adjusted from the first number of bits are least significant bits of the first number of bits. ### Claim 28 (depends on 18) The apparatus of claim 18, wherein determining to adjust the first number of bits is based at least in part on the at least one uplink transmission comprising a millimeter-wave transmission. ### Claim 29 (depends on 18) The apparatus of claim 18, wherein the effective number of bits comprises a second number of bits associated with a resolution of the digital-to-analog converter, and wherein the effective number of bits is less than the second number of bits associated with the resolution of the digital-to-analog converter. ### Claim 30 An apparatus for wireless communication at a base station, comprising: a processor, memory in electronic communication with the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to: establish a communication link with a user equipment (UE); transmit, to the UE, a downlink control message comprising at least one of a modulation and coding scheme associated with at least one uplink transmission or a number of layers associated with the at least one uplink transmission, wherein the at least one of the modulation and coding scheme or the number of layers indicate to adjust a first number of bits, wherein the first number of bits comprise at least one of an effective number of bits supported at a digital-to-analog converter of the UE or a number of bits supported at a transmission front end component of the UE; and receive, from the UE, the at least one uplink transmission based at least in part on the at least one of the modulation and coding scheme or the number of layers indicating to adjust the first number of bits.