Outer-loop feedback support for low error rates

Methods, systems, and devices for wireless communications are described which may enable a user equipment (UE) and a base station to use outer-loop feedback support to reach a desired error rate for low latency communications. For example, a base station may transmit a proxy acknowledgement feedback configuration to a UE for communications associated with a low target error rate. In some cases, after receiving the communications from the base station, the UE may receive secondary communications from the base station. The UE may then decode the first and/or second communications according to the proxy acknowledgement feedback configuration and/or a normal acknowledgement feedback configuration and may determine a proxy acknowledgement feedback based on the decoding. Further, the UE may transmit the proxy and/or normal acknowledgement feedback to the base station, which may update outer-loop power settings for the low latency communications based on the acknowledgement feedback.

BACKGROUND

The following relates generally to wireless communications, and more specifically to outer-loop feedback support for low error rates.

In some wireless communication systems, different services may support different reliability and latency requirements. For example, ultra-reliable low latency communications (URLLC) may be implemented for high reliability data transmissions with a short delay (e.g., low latency) between receiving a data request and sending the data transmission. Additionally, the different services may include different target error rates (e.g., a block error rate (BLER)) that indicate how successfully data is transmitted from a base station to a UE (e.g., how reliable the data is transmitted). For example, a lower target error rate may indicate a more reliable data transmission based on a lower error rate of transport blocks that are not successfully received by the UE. In some cases, the target error rate may ensure reliability for corresponding data transmissions in scenarios such as where data retransmission opportunities are limited, the latency requirements are stringent (e.g., reducing the chances for retransmissions), or similar scenarios.

A transmitting device, such as a base station, may also regulate the power used in its transmissions to a UE through various feedback mechanisms. One such feedback mechanism is an outer-loop feedback support mechanism (e.g., outer-loop link adaptation (OLLA) techniques) used to modify power settings. The outer-loop feedback support mechanism uses feedback information received from the UE as a basis for adjusting the power settings. One parameter or type of feedback information received from the UE that may be used in the outer-loop feedback support mechanism is a measured error rate with respect to a target error rate. When the target error rate is high, convergence by the outer-loop feedback support mechanism may happen relatively quickly. However, when the target error rate is low, convergence may take longer (e.g., may require more than one round of transmissions with feedback support). In low-latency, ultra-reliability circumstances (e.g., for URLLC) where target error rates are low and where a number of allowed retransmissions may be zero or very few, convergence may not occur. Methods are desired for allowing outer-loop feedback support convergence even when a target error rate is low.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support outer-loop feedback support for low error rates. Generally, the described techniques provide for enabling a user equipment (UE) and a base station to use outer-loop feedback effectively even when a desired target error rate (e.g., block error rate (BLER)) is low and is associated with low latency wireless communications (e.g., ultra-reliable low latency communications (URLLC)). For example, a UE may be configured to communicate with a base station via communications associated with a low target error rate (e.g., with a BLER less than 1%). The base station may transmit a proxy acknowledgement (ACK) feedback configuration (e.g., traditional hybrid automatic repeat request (HARQ) ACK feedback, soft ACK feedback, etc.) to the UE for the communications such that the UE may transmit feedback for the communications with respect to both the low target error rate and a proxy target error rate. After receiving the communications, the UE may transmit ACK feedback based on the low target error rate as well as based on the proxy ACK feedback configuration. Additionally, the ACK feedback based on the proxy ACK feedback configuration may correspond to a proxy target error rate that is higher than the low target error rate. The base station may then control the outer-loop feedback for the communications based on the ACK feedback from the proxy ACK feedback configuration. In some cases, the proxy ACK feedback configuration may include a configuration for a partial decoding of the communications based on a number of log likelihood ratios (LLRs) to be decoded (where the number is less than the total number of LLRs in the communications) and/or an intermediate decoding based on a number of iterations less than a total number of iterations used for fully decoding the low latency communications.

Additionally or alternatively, the base station may transmit a second wireless communication to the UE with a second target error rate that is greater than the low target error rate for the low latency communications. In some cases, the second wireless communication may include enhanced mobile broadband (eMBB) traffic, dummy eMBB traffic, or broadcasted channel transmissions. Following the transmissions of both wireless communications, the UE may decode the low latency and/or second communications and transmit ACK feedback for the second wireless communications to the base station. The base station may then maintain an outer-loop feedback for the second wireless communications and adjust an outer-loop for the low latency communications based on the ACK feedback for the second wireless communications.

A method of wireless communications at a UE is described. The method may include receiving, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; receiving, from the base station, the communications associated with the target error rate; transmitting, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications; and transmitting, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; receive, from the base station, the communications associated with the target error rate; transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications; and transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for receiving, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; means for receiving, from the base station, the communications associated with the target error rate; means for transmitting, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications; and means for transmitting, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; receive, from the base station, the communications associated with the target error rate; transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications; and transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving an indication that the UE is to determine the second ACK feedback based on a subset of LLRs to be used for the communications.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the indication, a proxy down-sampling rate that may be less than a down-sampling rate of the communications; decoding the communications according to the proxy down-sampling rate, where the subset of LLRs includes LLRs decoded in accordance with the proxy down-sampling rate; and determining the second ACK feedback based on the decoding in accordance with the proxy down-sampling rate.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for decoding a random selection of LLRs of the communications, where the subset of LLRs includes the random selection of LLRs, and determining the second ACK feedback based on the decoding of the random selection of LLRs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the indication may include operations, features, means, or instructions for receiving the indication as part of the proxy ACK feedback configuration via radio resource control (RRC) signaling or as part of a downlink control information (DCI) message.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving an indication that the UE is to determine the second ACK feedback based on an intermediate decoding of the communications.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, via the indication, a number of decoding iterations to be used for the intermediate decoding, where the number of decoding iterations is less than a total number of decoding iterations to be used by the UE for decoding an entirety of the communications and is associated with the intermediate decoding; decoding the communications according to the number of decoding iterations; and determining the second ACK feedback based on the decoding by the number of decoding iterations.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the indication may include operations, features, means, or instructions for receiving the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the number of decoding iterations may correspond to the proxy target error rate that is greater than the target error rate.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for multiplexing the first ACK feedback with the second ACK feedback.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the second ACK feedback may be transmitted less frequently than the first ACK feedback.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the communications associated with the target error rate that is below the threshold target error rate may include URLLC.

A method of wireless communications at a base station is described. The method may include transmitting, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; transmitting, to the UE, the communications associated with the target error rate; receiving, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications; and receiving, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

An apparatus for wireless communications at a base station is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; transmit, to the UE, the communications associated with the target error rate; receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications; and receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Another apparatus for wireless communications at a base station is described. The apparatus may include means for transmitting, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; means for transmitting, to the UE, the communications associated with the target error rate; means for receiving, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications; and means for receiving, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

A non-transitory computer-readable medium storing code for wireless communications at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate; transmit, to the UE, the communications associated with the target error rate; receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications; and receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for updating outer loop power settings for the communications associated with the target error rate based on receiving the second ACK feedback and transmitting, to the UE, additional communications associated with the target error rate in accordance with the updated outer loop power settings.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting an indication that the UE is to determine the second ACK feedback based on a subset of LLRs to be used for the communications.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the indication, a proxy down-sampling rate that is less than a down-sampling rate of the communications, where the subset of LLRs includes LLRs decoded in accordance with the proxy down-sampling rate or a random selection of LLRs.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for estimating a signal-to-noise (SNR) gap between the first ACK feedback and the second ACK feedback based on the proxy down-sampling rate and adjusting the proxy down-sampling rate to achieve the proxy target error rate based on a difference between a predetermined SNR gap between the proxy target error rate and the target error rate and the estimated SNR gap.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the indication may include operations, features, means, or instructions for transmitting the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting an indication that the UE is to determine the second ACK feedback based on an intermediate decoding of the communications.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the indication, a number of decoding iterations to be used for the intermediate decoding, where the number of decoding iterations is less than a total number of decoding iterations to be used by the UE for decoding an entirety of the communications and is associated with the intermediate decoding.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the indication may include operations, features, means, or instructions for transmitting the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the number of decoding iterations may correspond to the proxy target error rate that is greater than the first target error rate.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the UE, a multiplexed feedback message including the first ACK feedback and the second ACK feedback.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the second ACK feedback may be received less frequently than the first ACK feedback.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the communications associated with the target error rate that is below the threshold target error rate may include URLLC.

A method of wireless communications at a base station is described. The method may include transmitting, to a UE, a first wireless communication associated with a first target error rate; transmitting, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate; receiving ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate; and adjusting an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication.

An apparatus for wireless communications at a base station is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, a first wireless communication associated with a first target error rate; transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate; receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate; and adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication.

Another apparatus for wireless communications at a base station is described. The apparatus may include means for transmitting, to a UE, a first wireless communication associated with a first target error rate; means for transmitting, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate; means for receiving ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate; and means for adjusting an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication.

A non-transitory computer-readable medium storing code for wireless communications at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, a first wireless communication associated with a first target error rate; transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate; receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate; and adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, adjusting the outer-loop power parameter further may include operations, features, means, or instructions for adjusting the first wireless communication based on an offset between a signal quality difference of the first target error rate and the second target error rate.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting a predetermined value for the offset.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving additional ACK feedback for unicast communications associated with the first wireless communications from one or more UEs and adapting the offset based on the additional ACK feedback, where the offset may be shared across the one or more UEs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first wireless communication may include URLLC, and the second wireless communication may include eMBB traffic or dummy eMBB traffic.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first wireless communication may include URLLC, and the second wireless communication may include one or more broadcast channel transmissions with different radio network temporary identifiers (RNTIs).

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for configuring a UE to monitor the one or more broadcast channel transmissions and to report ACK feedback for the one or more broadcast channel transmissions.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for adjusting an offset for outer-loop power control of the first wireless communication with the UE based on a known gap between the first target error rate and the second target error rate, where the second target error rate corresponds to a modulation and coding scheme (MCS) for the one or more broadcast transmissions.

DETAILED DESCRIPTION

In some wireless communication systems (e.g., New Radio (NR)), one or more wireless devices may implement outer-loop feedback (e.g., outside loop link adaptation (OLLA)) to achieve appropriate transmission power settings (e.g., based on a modulation and coding scheme (MCS)). In some cases, the outer-loop feedback may enable a base station to adjust an average error rate (e.g., block error rate (BLER)) of its communications to reach a target error rate. In some services associated with the wireless communications system (e.g., mission critical functions, ultra-reliable low latency communications (URLLC)), a low BLER may be desired and/or required. For example, the resources for retransmissions in certain situations (e.g., for these services) may be limited and latency may be very stringent (e.g., based on not many chances for retransmission). As such, the base station may target a low error rate for such communications and may further use the outer-loop feedback to adjust an MCS and/or transmission power for the communications in order to reach the target BLER.

In some cases, the wireless communications system may receive feedback from wireless devices and use the feedback to drive the outer-loop feedback and make adjustments to reach the target BLER. Such feedback may be in the form of positive feedback (e.g., an acknowledgement (ACK) message) that acknowledges successfully received transmissions or negative feedback (e.g., a negative ACK (NACK) message) that indicates an error for received transmissions (e.g., the transmission was not received or decoded correctly). Accordingly, the NACK messages may enable step downs of a transmission parameter (e.g., power) for the outer-loop feedback by a set amount to achieve the target BLER. In some examples, if a device (e.g., a user equipment (UE)) receives data transmissions for communications associated with a low BLER, the device may, as a result, encounter only a small number of NACK samples to drive the outer-loop feedback. In some cases, the small number of NACK samples may prevent the outer-loop feedback from converging to the target BLER. Therefore, it may be beneficial to implement methods that can achieve outer-loop feedback convergence for communications preferring a low BLER.

As described herein, a wireless communications system may introduce additional outer-loop feedback support in the form of a proxy ACK/NACK feedback (e.g., traditional ACK/NACK feedback, soft ACK/NACK feedback, etc.) from a wireless device (e.g., a UE). In some instances, the proxy ACK/NACK feedback may be based on a subset or an intermediate decoding of the low-BLER transmissions, with the proxy ACK/NACK feedback associated with a higher BLER (e.g., and therefore generating more NACKs) than generated by the low BLER as discussed above. Additionally or alternatively, a wireless device may provide a second ACK/NACK feedback from additional transmissions received at the wireless device, where the transmissions may also target a higher BLER and generate more NACKs. For example, the second ACK/NACK feedback may be based on additional wireless communications (e.g. enhanced mobile broadband (eMBB) transmissions), dummy communications, or broadcast channel transmissions.

In the case of using the subset or the intermediate decoding of the low-BLER transmissions, a base station may indicate to the wireless device a specified subset of the communications to decode or a specified number of iterations for an intermediate decoding of the communications to perform. The subset/intermediate decoding may correlate the proxy feedback to the low-BLER transmissions. As such, the base station may then perform the outer-loop feedback based on the proxy feedback, with the correlation that when the proxy feedback reaches the specified BLER, the low-BLER communications may also reach the targeted low BLER. In the case of using a second communications (e.g., the additional communications, eMBB transmissions, dummy communications, or broadcast channel transmissions), the base station may request ACK/NACK feedback from a wireless device for the second communications. In this case, the additional ACK/NACK feedback may drive an outer-loop feedback for the second communications, which may determine a backoff (e.g., adjustment) for a parameter of the second communications (e.g., MCS, transmission power, etc.). Additionally, the base station may estimate an offset between the parameter backoff for the second communications and a backoff for the low-BLER transmissions, each at a respective desired BLER. As such, the base station may apply the backoff from the second communications adjusted by the estimated offset to drive the outer-loop feedback for the low-BLER transmissions to reach the target low BLER.

Aspects of the disclosure are initially described in the context of a wireless communications system. Additional wireless communications systems and feedback systems, a flowchart, and a process flow are then provided to illustrate aspects of the disclosure. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to outer-loop feedback support for targeting low error rates.

FIG. 1illustrates an example of a wireless communications system100that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. The wireless communications system100includes base stations105, UEs115, and a core network130. In some examples, the wireless communications system100may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or an NR network. In some cases, wireless communications system100may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications (e.g., URLLC), or communications with low-cost and low-complexity devices.

In some cases, UEs115and base stations105may support retransmissions of data to increase the likelihood that data is received successfully. HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). A CRC may be an error-detecting code appended to a block of data to be transmitted. In some cases, the value of the CRC may be calculated from the block of data itself, and the length of the CRC may determine the number of errors which can be detected in the block of data on reception. In some instances, HARQ may utilize error detection, such as a CRC, to determine whether a block of data can be successfully decoded. Additionally or alternatively, a CRC can be used to compute other signal quality metrics (e.g., BLER). In some cases, a BLER may be calculated as the proportion of received data blocks which is decoded erroneously, where errors are detected by CRC failure. As such, a BLER may be used as a measure of received signal quality.

HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions). In some cases, a wireless device may support same-slot HARQ feedback (e.g., ACK/NACK feedback), where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval. In some examples, a transmitting device (e.g., base station105, UE115) may indicate a HARQ configuration to a receiving device (e.g., UE115) using control signaling. Additionally, positive HARQ feedback (e.g., indicating a successfully-decoded block of data) may be referred to as an ACK, while negative HARQ feedback (e.g., HARQ feedback indicating an error in decoding the block of data) may be referred to as a NACK. As such, HARQ feedback may also be referred to as ACK/NACK feedback.

Additionally, a UE115in wireless communications system100may be configured to transmit channel quality information (CQI) information to a base station105. In some cases, the UE115may report a CQI using a channel quality measurement (e.g., signal to noise ratio (SNR), signal to interference plus noise ratio (SINR)). In some instances, the UE115may also report the CQI as a function of frequency (e.g., for different channels). Additionally, CQI information may include information a base station105may use to determine appropriate configurations for communicating with a UE115. For instance, a CQI from a UE115may include a CQI which a base station105may use to identify an MCS for a transmission to the UE115. In some cases, the base station105may use CQIs to estimate the quality of channels available for communications with the UE115, such that the base station may be able to identify appropriate resources for communicating with the UE115. Thus, a base station105may use CQI information received from a UE115to determine appropriate configurations and appropriate resources for communications with the UE115. Additionally, a UE115may transmit CQI information to a base station as a part of channel state information (CSI) transmissions. In some cases, CSI may also include additional information regarding channel characteristics and channel quality.

In some cases, wireless communication system100may implement an outer-loop feedback system (e.g., an OLLA algorithm) to select appropriate transmission parameters (e.g., MCS, transmission power, etc.) for current channel conditions. In some cases, the outer-loop feedback may be used to adaptively modify the transmission parameters to reach a target channel quality (e.g., as indicated by CSI, CQI, SNR, SINR, BLER, etc.). In some cases, a base station105may use the outer-loop feedback to adjust an average BLER to reach a target BLER, where the outer-loop feedback may be based on the targeted BLER. In some examples, if the actual BLER does not match the target BLER the OLLA may modify the transmission parameters by a certain amount (e.g., by a backoff) based on whether data packets have been received correctly or not. For instance, the outer-loop feedback may be driven by ACK/NACK feedback, in which a UE115may transmit ACK/NACK feedback to the base station105in response to data transmissions.

In cases where the actual BLER may not match the target BLER, if the base station105receives a NACK from the UE115, the base station105may lower the transmission parameter by a specified number of decibels (e.g., 1 dB, 2 dB, 3 dB). Additionally or alternatively, if the actual BLER does not match the target BLER and the base station105receives an ACK from the UE115, the base station105may raise the transmission parameter by a specified number of decibels (e.g., 0.001 dB, 0.002 dB, 0.003 dB). In some cases, the amount that the base station105raises the transmission parameter for an ACK may correspond to the amount that the base station105lowers the transmission parameter for a NACK. For example, if a 0.1% BLER is targeted for the communications and the base station105lowers the transmission parameter by a configured X dB (e.g., 1 dB, 2 dB, 3 dB) when a NACK is received, the base station105may raise the transmission parameter by 0.001*X dB (e.g., 0.001 dB, 0.002 dB, 0.003 dB) when an ACK is received, where 0.001 may be a multiplier derived from the targeted 0.1% target BLER.

In some services supported by wireless communications system100(e.g., mission critical functions, URLLC), a low BLER may be desired and/or required (e.g., 0.1% or 0.01% BLER). For example, the resources for retransmission in certain situations may be limited and latency may be very stringent (e.g., because there are not many chances for retransmission). As such, wireless communications system100may target the low BLER for these communications and may further use outer-loop feedback to adjust transmission parameters of the communications to reach the targeted low BLER. Because the low BLER is desired, the BLER for the communications may initially be set to a low value (e.g., 0.1%). However, if a UE115receives data on a channel with a low BLER, the UE115may, as a result, encounter only a small number of NACK samples to drive the outer-loop feedback. In some cases, the small number of NACK samples may prevent the outer-loop feedback from converging to the target BLER. For example, with an initial BLER of 0.1%, every 1000 transmissions will, on average, result in one NACK (e.g., (1000 transmissions)×(0.1% BLER)=1 NACK), which may provide insufficient feedback to drive the outer-loop feedback to converge. Therefore, it may be beneficial to implement methods that can achieve the outer-loop feedback convergence for communications preferring a low BLER.

Wireless communications system100may support techniques for implementing outer-loop feedback for targeting a low BLER for corresponding communications, such as introducing additional outer-loop feedback support in the form of a proxy ACK/NACK feedback (e.g., traditional HARQ ACK/NACK feedback, soft ACK/NACK feedback, etc.) from a UE115to a base station105, where the proxy ACK/NACK feedback may be associated with a higher BLER and generate more NACK instances to drive the outer-loop feedback for the communications. In some instances, the proxy ACK/NACK feedback may be based on a subset decoding or an intermediate decoding of the communications, which may target the higher BLER (e.g., and therefore generate more NACKs). Additionally or alternatively, the UE115may provide ACK/NACK feedback from additional transmissions received from the base station105, where the additional transmissions may also target a higher BLER and generate more NACKs. This ACK/NACK feedback may be used to drive one or more outer-loop feedbacks, which may help the base station105adjust parameters for the communications that may allow the base station105to reach the targeted low BLER.

FIG. 2illustrates an example of a feedback system200that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. In some examples, feedback system200may implement aspects of wireless communications system100. Feedback system200may include a UE115-aand a base station105-a, which may be examples of a UE115and a base station105, respectively, as described with reference toFIG. 1. In some instances, UE115-aand base station105-amay communicate using ultra-reliable communications (e.g., mission-critical communications, URLLC).

In some cases, a low BLER (e.g., error rate) may be desired for communications between UE115-aand base station105-a. As such, the low BLER target may result in insufficient NACK feedback to correctly drive an outer-loop feedback to set appropriate transmission parameters for the communications between UE115-aand base station105-a(e.g., to achieve the desired low BLER). As such, base station105-amay configure UE115-ato transmit additional outer-loop feedback support in the form of a proxy ACK/NACK feedback (e.g., traditional HARQ ACK/NACK feedback, soft ACK/NACK feedback, etc.).

For example, base station105-amay configure UE115-ato feedback not only ACK/NACK bits corresponding to the targeted low BLER (e.g., 0.1%), but also proxy ACK/NACK bits corresponding to a higher BLER (e.g., 10%). In some cases, the ACK/NACK feedback for the higher BLER may help the outer-loop feedback converge to the higher BLER. For example, the higher BLER may be mapped to the targeted low BLER, which may ensure that as the outer-loop feedback converges to the higher BLER using the proxy ACK/NACK feedback, the low-error communications may similarly converge to the targeted low BLER. Base station105-amay send a configuration message205to UE115-ato indicate a configuration for the proxy ACK/NACK feedback. In some cases, configuration message205may be sent using downlink control information (DCI) or RRC. After transmitting configuration message205, base station105-amay transmit one or more data packets210to UE115-a. Based on configuration message205and data packets210, UE115-amay transmit a normal ACK/NACK feedback215based on attempting to decode the entire low-error communications (e.g., all data packets210) and a proxy ACK/NACK feedback220based on the proxy ACK/NACK feedback configuration received in configuration message205.

The proxy ACK/NACK feedback220may include traditional HARQ ACK/NACK feedback, where one bit is transmitted by UE115-ato indicate whether a downlink transmission (e.g., the one or more data packets210) is successfully received and decoded (e.g., an ACK) or is unsuccessfully received or decoded (e.g., a NACK). Additionally or alternatively, the proxy ACK/NACK feedback220may include a soft ACK/NACK feedback, where UE115-atransmits multiple bits (e.g., three (3) bits) to indicate how strong decoded LLRs were for the downlink transmission. For example, if UE115-atransmits ‘111’ for the soft ACK/NACK feedback, base station105-amay determine that the downlink transmission sent to UE115-awas in good condition (e.g., the transmission had a good SNR). Alternatively, if UE115-atransmits a ‘001’ for the soft ACK/NACK feedback, base station105-amay determine that UE115-asuccessfully received and decoded the downlink transmission but that the downlink transmission was close to failure. As such, base station105-amay adjust one or more parameters to improve conditions for subsequent downlink transmissions (e.g., improve SNR, increase transmission power, etc.) based on the downlink transmission being close to failure from the soft ACK/NACK feedback (e.g., the ‘001’ transmitted by UE115-a).

In some cases, a higher BLER may be obtained by partially decoding data packets210. Accordingly, base station105-amay configure UE115-ato report ACK/NACK feedback for the partial decoding (e.g., through configuration message205). For example, the partial decoding may be achieved by performing the decoding with a selected subset of bits received by UE115-a(e.g., a portion of data packets210). In some cases, the partial decoding may be accomplished by using a subset of LLRs corresponding to the subset of bits. For example, UE115-amay receive 3000 bits, decode 10% of the bits for the partial decoding (e.g., based on configuration message205), and may then send ACK/NACK feedback for the 10% of the bits used for the partial decoding (e.g., via proxy ACK/NACK feedback220). In some cases, the de-rate-matching process of the partial decoding may mimic a higher MCS (e.g., artificially increase BLER) because some bits may be intentionally ignored.

In some instances, the subset of bits (e.g., subset of corresponding LLRs) may be randomly picked by base station105-aand indicated in configuration message205to UE115-a. Additionally or alternatively, the subset of bits may be uniformly down-sampled by UE115-abased on a specified down-sampling rate as indicated in configuration message205. For example, base station105-amay configure the down-sampling rate to control the behavior of the proxy ACK/NACK feedback220based on the targeted low BLER. In some cases, the partial decoding ACK/NACK configuration may be assistant information multiplexed with a standard ACK/NACK codebook. Additionally or alternatively, the partial decoding ACK/NACK configuration may be configured for all standard ACK/NACK or for a subset of standard ACK/NACK (e.g., to reduce overhead).

In some cases, UE115-amay report the proxy ACK/NACK feedback220(e.g., based on the partial decoding) to base station105-ain addition to the normal ACK/NACK feedback215. In some examples, base station105-amay then use the proxy ACK/NACK feedback220to drive the outer-loop feedback backoff, which may include controlling the outer-loop feedback to the higher BLER (e.g., 10%) based on the partial decoding. Additionally, base station105-amay map the higher BLER to the targeted lower BLER by estimating an SNR gap between full decoding and partial decoding. In some cases, if base station105-aknows what the SNR gap should be between the higher BLER (e.g., 10%) and lower BLER (e.g., 0.1%), base station105-amay be able to control the down-sampling rate to achieve the required SNR gap between the lower targeted BLER and the higher BLER based on the partial decoding. As such, base station105-amay then control the BLER from the partial decoding to the higher BLER (e.g., 10%) using the outer-loop feedback and may assume that the targeted low BLER (e.g., belonging to the data packets210) correspondingly drops to the appropriate target (e.g., 0.1%). Additionally, using the outer-loop feedback to control to a higher BLER may speed outer-loop feedback convergence rates since the amount of NACK instances may be higher. For example, a 10% BLER rate may result in proxy NACKs for every 100 out of 1000 data packets, while a 0.1% BLER rate may result in actual NACKs for every 1 out of 1000 data packets.

Additionally, the partial decoding may use an additional round of decoding with the subset of bits (e.g., the LLRs corresponding the subset of bits). In some situations, the additional round of decoding may not affect system performance if the additional round of decoding is within the envelope of capability for UE115-a. Additionally, UE115-amay be configured by base station105-ato report partially decoded ACK/NACK (e.g. proxy ACK/NACK) less frequently than normal ACK/NACK. For example, base station105-amay configure UE115-ato report one proxy ACK/NACK instance for every ten normal ACK/NACK instances.

In another example of proxy ACK/NACK feedback using a higher BLER, UE115-amay decode data packets210with less iterations than decoding the entirety of data packets210. For example, UE115-amay report proxy ACK/NACK feedback220based on an intermediate decoding, in addition to reporting the normal ACK/NACK feedback215(e.g., standard ACK/NACK feedback, default ACK/NACK feedback, etc.). In one example, UE115-amay report proxy ACK/NACK feedback after three iterations of decoding, as opposed to after ten iterations for the standard ACK/NACK. In the case of using less iterations, base station105-amay configure UE115-a(e.g., via configuration message205) to report proxy ACK/NACK feedback220(e.g., an additional ACK/NACK feedback) based on an intermediate decoding. Since UE115-amay report its feedback before finishing decoding completely, the proxy data may mimic a higher MCS (e.g., artificially increase BLER). In some instances, base station105-amay configure the number of iterations to control the behavior of the resultant proxy MCS and/or BLER. In some cases, the amount of intermediate decoding for the proxy ACK/NACK configuration may be assistant information multiplexed with a standard ACK/NACK codebook. Additionally or alternatively, the amount of intermediate decoding for the proxy ACK/NACK configuration may be configured for all standard ACK/NACK or for a subset of standard ACK/NACK (e.g., to reduce overhead). Base station105-amay use the proxy ACK/NACK feedback220from the intermediate decoding in a similar manner as the partial decoding as described above to drive the outer-loop feedback to achieve the targeted lower BLER.

In some cases, the method of using intermediate decoding may result in the same amount of decoding for typical ACK/NACK feedback (e.g., no additional decoding). For example, UE115-amay report an intermediate ACK/NACK result from the decoding process (e.g., ACK/NACK results after a specified number of iterations), without having to decode data packets210multiple times. Additionally, UE115-amay be configured by base station105-ato report intermediately-decoded ACK/NACK (e.g. proxy ACK/NACK feedback220) less frequently than the normal ACK/NACK feedback215. For example, base station105-amay configure UE115-ato report one proxy ACK/NACK instance for every ten actual ACK/NACK instances. Based on the proxy ACK/NACK feedback220from the partial decoding and/or the reduced number of iterations for the intermediate decoding, the targeted low BLER may be achieved more efficiently than using only the normal ACK/NACK feedback for outer-loop feedback.

FIG. 3illustrates an example of a feedback system300that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. In some examples, feedback system300may implement aspects of wireless communications system100and/or feedback system200. Feedback system300may include a UE115-band a base station105-b, which may be examples of a UE115and a base station105, respectively, as described with reference toFIGS. 1 and 2. In some instances, UE115-band base station105-bmay communicate using ultra-reliable communications (e.g., mission-critical communications, URLLC).

In some cases, a low error rate (e.g., BLER) may be desired for communications between UE115-band base station105-b. In some examples, a low BLER target may result in insufficient NACK feedback to correctly drive the outer-loop feedback to set an appropriate MCS (e.g., to achieve the desired BLER). As such, feedback system300may use a different wireless communication with a different BLER target to drive the outer-loop feedback.

For example, base station105-bmay transmit additional wireless communications (e.g., eMBB traffic) with a higher BLER (e.g., 10%) to UE115-band request ACK/NACK feedback (e.g., bits) corresponding to the additional communications. In some cases, base station105-bmay maintain an outer-loop feedback for the additional communications and may base the outer-loop feedback for the low-error communications on the outer-loop feedback for the additional communications. For example, base station105-bmay send one or more low-BLER data packets305to UE115-b. Additionally, base station105-bmay transmit one or more additional data packets310for other communication types (e.g., eMBB) to UE115-b. As a part of receiving both transmissions, UE115-bmay transmit ACK/NACK feedback315(e.g., traditional HARQ ACK/NACK feedback, soft ACK/NACK feedback, etc.) to base station105-b, based on its decoding of the additional data packets310. Upon receiving the ACK/NACK feedback315, base station105-bmay drive the outer-loop feedback for the higher-error communications with the corresponding feedback. Furthermore, base station105-bmay also introduce a backoff plus an offset (e.g., based on the higher-BLER outer-loop feedback) to the outer-loop feedback for the low-BLER communications.

For example, base station105-bmay transmit both URLLC (e.g., low-BLER data packets305) and eMBB (e.g., additional data packets310) communications to UE115-b. In some cases, the eMBB packets may target a higher BLER (e.g., 10%) than the BLER for the URLLC packets (e.g., 0.1%). After receiving and decoding both communication streams, UE115-bmay transmit ACK/NACK feedback315for the eMBB communications. Base station105-bmay then use the eMBB ACK/NACK data in ACK/NACK feedback315to run the outer-loop feedback for the eMBB communications. Upon running the outer-loop feedback for eMBB, base station105-bmay determine that a certain backoff (B1) is needed for the eMBB transmissions and associated higher BLER. Further, base station105-bmay determine an offset (O) between the eMBB backoff and a URLLC backoff and apply the sum of the eMBB backoff and the offset (e.g., B1+O) to an outer-loop feedback for the URLLC. In some cases, base station105-bmay use scheduler implementation to accomplish this ACK/NACK feedback scheme, without requiring any additional calculations or input from UE115-b(e.g., UE115-bmay not need to know any additional information beyond the need to report ACK/NACK feedback on the received data streams).

In some examples, the offset may be estimated by the distance between the points of the high BLER and low BLER on the SINR prediction error distribution. In other instances, the offset may be a predetermined value (e.g., a fixed value determined from an offline study). In some cases, as a result of using a fixed value for the offset, the URLLC outer-loop feedback may become half open-loop and half closed-loop and the target BLER may not reach the exact value. Additionally or alternatively, the offset may be an adapting offset that uses ACK/NACK feedback for the low-BLER communications (e.g., URLLC) from UE115-b. In other examples, the offset may be an adapting offset that uses ACK/NACK feedback for the low-BLER communications from multiple UEs115(e.g., based on unicast URLLC communications between each of the multiple UEs115and base station105-b) that may share the same offset, which may assume that the per-UE offset will drive the channel adaptation.

In some cases, UE115-bmay not be scheduled to receive additional communications (e.g., eMBB traffic) from base station105-b. As such, base station105-bmay transmit a dummy traffic (e.g., dummy eMBB traffic) to UE115-b, which may include fake data that UE115-bmay eventually discard. For example, base station105-bmay transmit both low-error communications (e.g., low-BLER data packets305) and dummy communications (e.g., additional data packets310) with a higher BLER to UE115-b. Since the additional data packets310may now include data that will eventually be discarded, this method may increase resource use and signaling overhead. After transmitting the dummy data blocks, the process of using the additional traffic to drive the low-BLER outer-loop feedback may follow the same steps outlined above for the additional communications.

Additionally or alternatively, base station105-bmay introduce a broadcast channel transmission if UE115-bis not scheduled for additional communications. In some cases, base station105-bmay transmit multiple broadcasts, each with a different MCS and with a different radio network temporary identifier (RNTI). In some examples, because the broadcast may not carry any ACK resource indicator (ARI) information in the grant, UE115-bmay be configured (e.g., via RRC or DCI) to monitor one or more such broadcast channels (e.g., with different MCSs) and report ACK/NACK feedback to base station105-b. Additionally, base station105-bmay collect feedback from UE115-bfor each channel to see how the ACK/NACK ratio corresponds to the channel MCS (e.g., since broadcast may not be MCS or rate-controlled). For example, base station105-bmay gather and analyze information to conclude that, at a certain MCS, UE115-bwill receive data at a certain BLER (e.g., 10%). Furthermore, if the gap between the broadcast BLER and the low, targeted BLER is known, base station105-bmay apply the offset to drive the low-BLER outer-loop feedback as described above. In some instances, the broadcast channel scheme may result in an extra broadcast transmission (e.g., physical downlink shared channel (PDSCH)) for base station105-band an extra ACK/NACK report by UE115-b. Since the broadcast channel may be shared by multiple UEs, the system overhead may be smaller when compared to the non-broadcast dummy transmissions described above.

FIG. 4illustrates an example of a flowchart400that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. In some examples, flowchart400may implement aspects of wireless communications system100and/or feedback systems200and300. Flowchart400illustrates base station105and UE115behavior while performing outer-loop feedback, where the base station105and UE115may be examples of a base station105and a UE115, as described with reference toFIGS. 1-3. In some cases, the outer-loop feedback may be an OLLA scheme implemented by the base station105for adjusting transmission parameters to achieve a low BLER for communications in the system. As described herein, the base station105may use a combination of proxy ACK/NACK feedback (e.g., traditional HARQ ACK/ANCK feedback, soft ACK/NACK feedback, etc.) and normal ACK/NACK feedback to drive the OLLA scheme for achieving the low BLER.

At405, a base station105may begin the OLLA process for communications with a low targeted error rate (e.g., low BLER) by signaling a UE115to begin communications.

At410, the base station105may transmit data (e.g., URLLC data packets) to the UE115and/or receive data (e.g., ACK/NACK feedback, CSI) from the UE115. In some instances, the base station105may receive CSI that may include CQI data that may be used to determine a BLER for the transmissions.

At415, the base station105may acquire the current BLER for the low-error (e.g., URLLC) communications. In some cases, acquiring the current BLER may include gathering information from the UE115and/or calculating a BLER based on information already received from the UE115.

At420, the base station105may compare the current BLER with the targeted BLER for the low-error communications. In some cases, if the current and targeted BLER are not equal, the base station105may continue with the OLLA process at425. In other cases, if the current and targeted BLER are equal, the base station105may return to transmitting and receiving at410, using the same MCS and/or other transmission parameters. In some cases, the base station105may determine that the current and targeted BLER are equal if the two values are within a certain margin of error.

At425, if the base station105has determined that the current BLER is not equal to the target, the base station105may further determine the current MCS (e.g., a) used in the low-BLER communications with the UE115.

At430, the base station105may review the most recent proxy ACK/NACK feedback from the UE115. In some cases, the proxy ACK/NACK feedback may be based on proxy ACK/NACKs from low-error communications or based on proxy ACK/NACKs from additional communications, as described above with reference toFIGS. 2 and 3. Additionally, the proxy ACK/NACKs may include traditional HARQ ACK/NACK feedback (e.g., one bit ACK feedback), soft ACK/NACK feedback (e.g., multiple bits to represent the strength of a decoded transmission), or a different ACK/NACK feedback configuration. In some instances, the base station105may determine that the most recent feedback contained an ACK (e.g., with a represented strength of the ACK with the soft ACK/NACK feedback), in which case the base station105may proceed to435-a. In other cases, the base station105may determine that the most recent feedback was a NACK, in which case the base station105may proceed to435-b. In some examples, the feedback loop in flowchart400may be completed and return to step410in the same amount of time it may take to receive a new ACK/NACK feedback from the UE115. As such, the base station105may have the chance to perform OLLA based on each new ACK/NACK response.

At435, the base station105may set a backoff or adjustment (e.g., A) for the MCS pertaining to its low-BLER communications with the UE115. In some cases, as shown at435-a, the base station105may detect an ACK and set a positive backoff to its MCS (e.g., 0.001 dB, 0.002 dB, 0.003 dB). In other cases, as shown at435-b, the base station105may detect a NACK and set a negative backoff (e.g., decrease, step down) to its MCS (e.g., −1 dB, −2 dB, −3 dB). In some cases, the backoff for an ACK may be a percentage of the backoff for a NACK (e.g., where the percentage may be based on the BLER target). For example, a NACK may result in a backoff which decreases the MCS by X dB (e.g., 1 dB, 2 dB, 3 dB), and an ACK may result in a backoff which increases the MCS by 0.001*X dB (e.g., 0.001 dB, 0.002 dB, 0.003 dB), where 0.001 may be a multiplier based on the target BLER (e.g., 0.1%). Additionally or alternatively, the backoff may be calculated by taking a similar backoff from a higher-BLER communication and adding it to a calculated offset, as described above with reference toFIG. 3.

At440, the base station105may schedule its upcoming transmissions with a new MCS (e.g., α+Δ) based on the backoff value determined at435. In some cases, the base station105may increase or decrease its current MCS by the determined backoff value to create the new MCS value. Additionally, the base station105may return to410and transmit and/or receive data using the new MCS, thus beginning the OLLA process again for a new round of transmissions and feedback.

FIG. 5illustrates an example of a process flow500that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. In some examples, process flow500may implement aspects of wireless communications system100and/or feedback systems200and300. Additionally, process flow500may implement aspects of flowchart400. Further, process flow500may include a UE115-cand a base station105-c, which may be examples of a UE115and a base station105, respectively, as described with reference toFIGS. 1-4.

In the following description of the process flow500, the operations between the UE115-cand base station105-cmay be transmitted in a different order than the exemplary order shown, or the operations performed by base station105-cand UE115-cmay be performed in different orders or at different times. Certain operations may also be left out of the process flow500, or other operations may be added to the process flow500. It is to be understood that while base station105-cand UE115-care shown performing a number of the operations of process flow500, any wireless device may perform the operations shown.

At505, base station105-cmay transmit, and UE115-cmay receive, a proxy ACK feedback configuration for communications (e.g., mission critical communications, URLLC) associated with a target error rate (e.g., first target error rate) that is below a threshold target error rate (e.g., a low target error rate, a BLER less than 1%). Additionally, the proxy ACK feedback configuration may include a traditional ACK/NACK feedback from UE115-c, a soft ACK/NACK feedback from UE115-c, or a different ACK/NACK feedback configuration for UE115-cto send feedback to base station105-c.

In some cases, the feedback configuration may include an indication that UE115-cis to determine a second ACK feedback based on a subset of LLRs to be used for the communications. Additionally, the indication may include a proxy down-sampling rate that is less than a down-sampling rate of the communications, where the subset of LLRs may include LLRs decoded in accordance with the proxy down-sampling rate or a random selection of LLRs. In some instances, the indication may be part of the proxy ACK feedback configuration transmitted via RRC signaling or as part of a DCI message.

In other cases, the feedback configuration may include an indication that UE115-cis to determine the second ACK feedback based on an intermediate decoding of the communications. Additionally, the indication may include a number of decoding iterations to be used for the intermediate decoding, where the number of decoding iterations may be less than a total number of decoding iterations to be used by UE115-cfor decoding an entirety of the first communications and where the number of decoding iterations may be associated with the intermediate decoding. In some cases, the number of decoding iterations may correspond to a proxy target error rate that is greater than the target error rate. Additionally, the indication may be part of the proxy ACK feedback configuration sent via RRC signaling or as part of a DCI message.

At510, base station105-cmay transmit, and UE115-cmay receive, the communications associated with the target error rate (e.g., first communications, low-error communications, etc.). In some instances, the communications associated with the target error rate (e.g., first target error rate) below the threshold target error rate may include URLLC.

At515, base station105-cmay transmit, and UE115-cmay receive, a second wireless communication with a second target error rate that is greater than the first target error rate. In some instances, the second wireless communication may include eMBB traffic or dummy eMBB traffic. Additionally, the second wireless communication may include one or more broadcast channel transmissions with different RNTIs, and base station105-cmay configure UE115-cto monitor the one or more broadcast channel transmissions and to report ACK feedback for the one or more broadcast channel transmissions.

At520, UE115-cmay decode the first and/or second communications according to the proxy ACK feedback configuration received at505. In some instances, decoding the communications may include decoding the communications according to the proxy down-sampling rate, where UE115-cmay decode a subset of LLRs that may include LLRs decoded in accordance with the proxy down-sampling rate. Additionally or alternatively, decoding the communications may include decoding a random selection of LLRs of the communications, where the subset of LLRs includes the random selection of LLRs. In other instances, decoding the communications may include decoding the communications according to the number of decoding iterations.

At525, UE115-cmay determine a second ACK feedback based on the decoding, in accordance with the proxy ACK feedback configuration received at505. In some cases, determining the second ACK feedback may be based on decoding in accordance with the proxy down-sampling rate. Additionally or alternatively, determining the second ACK feedback may be based on the decoding of the random selection of LLRs. In other cases, determining the second ACK feedback may be based on the decoding by the number of decoding iterations.

At535, UE115-cmay transmit, and base station105-cmay receive, a first ACK feedback for the first communications (e.g., low-BLER communications) based on the target error rate and on decoding the communications.

At540, UE115-cmay transmit, and base station105-cmay receive, a second ACK feedback for the first communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. In some cases, the UE115-cmay multiplex the first ACK feedback with the second ACK feedback. Additionally or alternatively, the second ACK feedback may be transmitted and received less frequently than the first ACK feedback.

In other cases, UE115-cmay transmit, and base station105-cmay receive, a second ACK feedback for the second wireless communications based on successful reception of the second wireless communication in accordance with the second target error rate.

At545, base station105-cmay update outer loop power settings (e.g., via OLLA) for the communications associated with the target error rate, based on receiving the second ACK feedback. In some cases, adjusting the outer loop power parameter for the first wireless communications may be based on the ACK feedback for the second wireless communication. Additionally, adjusting the outer loop power parameter may further include adjusting the first wireless communication with UE115-cbased on an offset between a signal quality difference of the first target error rate (e.g., for the first communications) and the second target error rate (e.g., for the second communications). In some cases, the offset may be determined by selecting a predetermined value (e.g., a fixed value for the offset based on an offline study). In some examples, determining the offset may include receiving additional ACK feedback for unicast communications associated with the first wireless communications from one or more UEs115and adapting the offset based on the additional ACK feedback, where the offset may be shared across the one or more UEs115. Additionally, adjusting the offset may be based on a known gap between the first target error rate and the second target error rate, where the second target error rate may correspond to an MCS for the one or more broadcast transmissions.

At550, base station105-cmay adjust the proxy ACK feedback configuration. In some examples, adjusting the configuration may include estimating an SNR gap between the first ACK feedback and the second ACK feedback. In some cases, estimating the SNR gap may be based on the proxy down-sampling rate and adjusting the proxy down-sampling rate to achieve the proxy target error rate based on a difference between a predetermined SNR gap between the proxy target error rate and the target error rate and the estimated SNR gap.

At555, base station105-cmay transmit, and UE115-cmay receive, additional communications associated with the target error rate in accordance with the updated outer loop power settings. In some instances, the additional communications may include examples of the first communications, the second communications, or a combination thereof. Additionally, the additional communications may include any necessary configuration signaling needed to carry out possible changes to the feedback configuration.

The receiver610may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to outer-loop feedback support for low error rates, etc.). Information may be passed on to other components of the device605. The receiver610may be an example of aspects of the transceiver920described with reference toFIG. 9. The receiver610may utilize a single antenna or a set of antennas.

The UE communications manager615may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. Additionally, the UE communications manager615may receive, from the base station, the communications associated with the target error rate. In some cases, the UE communications manager615may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications. Additionally, the UE communications manager615may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. The UE communications manager615may be an example of aspects of the UE communications manager910described herein.

The UE communications manager715may be an example of aspects of the UE communications manager615as described herein. The UE communications manager715may include a proxy feedback configuration receiver720, a low-BLER communications receiver725, a normal feedback transmitter730, and a proxy feedback transmitter735. The UE communications manager715may be an example of aspects of the UE communications manager910described herein.

The proxy feedback configuration receiver720may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate.

The low-BLER communications receiver725may receive, from the base station, the communications associated with the target error rate.

The normal feedback transmitter730may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications.

The proxy feedback transmitter735may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

The transmitter740may transmit signals generated by other components of the device705. In some examples, the transmitter740may be collocated with a receiver710in a transceiver module. For example, the transmitter740may be an example of aspects of the transceiver920described with reference toFIG. 9. The transmitter740may utilize a single antenna or a set of antennas.

FIG. 8shows a block diagram800of a UE communications manager805that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. The UE communications manager805may be an example of aspects of a UE communications manager615, a UE communications manager715, or a UE communications manager910described herein. The UE communications manager805may include a proxy feedback configuration receiver810, a low-BLER communications receiver815, a normal feedback transmitter820, a proxy feedback transmitter825, a partial decoding component830, an intermediate decoding component835, and a feedback multiplexer840. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The proxy feedback configuration receiver810may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate.

The low-BLER communications receiver815may receive, from the base station, the communications associated with the target error rate. In some cases, the communications associated with the target error rate that is below the threshold target error rate include URLLC.

The normal feedback transmitter820may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications.

The proxy feedback transmitter825may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

The partial decoding component830may receive an indication that the UE is to determine the second ACK feedback based on a subset of LLRs to be used for the communications. In some examples, the partial decoding component830may receive, via the indication, a proxy down-sampling rate that is less than a down-sampling rate of the communications; decode the communications according to the proxy down-sampling rate, where the subset of LLRs includes LLRs decoded in accordance with the proxy down-sampling rate; and determine the second ACK feedback based on the decoding in accordance with the proxy down-sampling rate. Additionally or alternatively, the partial decoding component830may decode a random selection of LLRs of the communications, where the subset of LLRs includes the random selection of LLRs, and determine the second ACK feedback based on the decoding of the random selection of LLRs. In some examples, the partial decoding component830may receive the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message.

The intermediate decoding component835may receive an indication that the UE is to determine the second ACK feedback based on an intermediate decoding of the communications. In some examples, the intermediate decoding component835may receive, via the indication, a number of decoding iterations to be used for the intermediate decoding, where the number of decoding iterations is less than a total number of decoding iterations to be used by the UE for decoding an entirety of the communications and is associated with the intermediate decoding. Accordingly, the intermediate decoding component835may decode the communications according to the number of decoding iterations and determine the second ACK feedback based on the decoding by the number of decoding iterations. In some examples, the intermediate decoding component835may receive the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message. Additionally, the number of decoding iterations may correspond to the proxy target error rate that is greater than the target error rate.

The feedback multiplexer840may multiplex the first ACK feedback with the second ACK feedback. In some cases, the second ACK feedback may be transmitted less frequently than the first ACK feedback.

FIG. 9shows a diagram of a system900including a device905that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. The device905may be an example of or include the components of device605, device705, or a UE115as described herein. The device905may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a UE communications manager910, an I/O controller915, a transceiver920, an antenna925, memory930, and a processor940. These components may be in electronic communication via one or more buses (e.g., bus945).

The UE communications manager910may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. Additionally, the UE communications manager910may receive, from the base station, the communications associated with the target error rate. In some cases, the UE communications manager910may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications. Additionally, the UE communications manager910may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

The receiver1010may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to outer-loop feedback support for low error rates, etc.). Information may be passed on to other components of the device1005. The receiver1010may be an example of aspects of the transceiver1320described with reference toFIG. 13. The receiver1010may utilize a single antenna or a set of antennas.

The base station communications manager1015may transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. Additionally, the base station communications manager1015may transmit, to the UE, the communications associated with the target error rate. In some cases, the base station communications manager1015may receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications. Additionally, the base station communications manager1015may receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Additionally or alternatively, the base station communications manager1015may transmit, to a UE, a first wireless communication associated with a first target error rate. In some cases, the base station communications manager1015may transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate. Additionally, the base station communications manager1015may receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate. In some cases, the base station communications manager1015may adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication. The base station communications manager1015may be an example of aspects of the base station communications manager1310described herein.

The receiver1110may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to outer-loop feedback support for low error rates, etc.). Information may be passed on to other components of the device1105. The receiver1110may be an example of aspects of the transceiver1320described with reference toFIG. 13. The receiver1110may utilize a single antenna or a set of antennas.

The base station communications manager1115may be an example of aspects of the base station communications manager1015as described herein. The base station communications manager1115may include a proxy feedback configuration transmitter1120, a low-BLER communications transmitter1125, a normal feedback receiver1130, a proxy feedback receiver1135, a high-BLER communications transmitter1140, a high-BLER feedback receiver1145, and an outer-loop adjustment component1150. The base station communications manager1115may be an example of aspects of the base station communications manager1310described herein.

The proxy feedback configuration transmitter1120may transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate.

The low-BLER communications transmitter1125may transmit, to the UE, the communications associated with the target error rate.

The normal feedback receiver1130may receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications.

The proxy feedback receiver1135may receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Additionally or alternatively, the low-BLER communications transmitter1125may transmit, to a UE, a first wireless communication associated with a first target error rate.

The high-BLER communications transmitter1140may transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate.

The high-BLER feedback receiver1145may receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate.

The outer-loop adjustment component1150may adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication.

The transmitter1155may transmit signals generated by other components of the device1105. In some examples, the transmitter1155may be collocated with a receiver1110in a transceiver module. For example, the transmitter1155may be an example of aspects of the transceiver1320described with reference toFIG. 13. The transmitter1155may utilize a single antenna or a set of antennas.

FIG. 12shows a block diagram1200of a base station communications manager1205that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. The base station communications manager1205may be an example of aspects of a base station communications manager1015, a base station communications manager1115, or a base station communications manager1310described herein. The base station communications manager1205may include a proxy feedback configuration transmitter1210, a low-BLER communications transmitter1215, a normal feedback receiver1220, a proxy feedback receiver1225, an outer-loop adjustment component1230, a partial proxy feedback component1235, an intermediate proxy feedback component1240, a multiplexed feedback receiver1245, a high-BLER communications transmitter1250, a high-BLER feedback receiver1255, and a broadcast channel transmitter1260. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The proxy feedback configuration transmitter1210may transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate.

The low-BLER communications transmitter1215may transmit, to the UE, the communications associated with the target error rate. In some examples, the low-BLER communications transmitter1215may transmit, to a UE, a first wireless communication associated with a first target error rate. In some cases, the communications associated with the target error rate that is below the threshold target error rate include URLLC.

The normal feedback receiver1220may receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications.

The proxy feedback receiver1225may receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

The outer-loop adjustment component1230may adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication. In some examples, the outer-loop adjustment component1230may adjust the first wireless communication based on an offset between a signal quality difference of the first target error rate and the second target error rate. In some examples, the outer-loop adjustment component1230may select a predetermined value for the offset. In some examples, the outer-loop adjustment component1230may receive additional ACK feedback for unicast communications associated with the first wireless communications from one or more UEs. In some examples, the outer-loop adjustment component1230may adapt the offset based on the additional ACK feedback, where the offset is shared across the one or more UEs.

Additionally or alternatively, the outer-loop adjustment component1230may update outer loop power settings for the communications associated with the target error rate based on receiving the second ACK feedback. In some examples, the outer-loop adjustment component1230may transmit, to the UE, additional communications associated with the target error rate in accordance with the updated outer loop power settings.

The high-BLER communications transmitter1250may transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate. In some cases, the first wireless communication may include URLLC traffic, and the second wireless communication may include eMBB traffic or dummy eMBB traffic.

Additionally or alternatively, the first wireless communication may include URLLC, and the second wireless communication may include one or more broadcast channel transmissions with different RNTIs.

The high-BLER feedback receiver1255may receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate.

The partial proxy feedback component1235may transmit an indication that the UE is to determine the second ACK feedback based on a subset of LLRs to be used for the communications. In some examples, the partial proxy feedback component1235may transmit, via the indication, a proxy down-sampling rate that is less than a down-sampling rate of the communications, where the subset of LLRs includes LLRs decoded in accordance with the proxy down-sampling rate or a random selection of LLRs. In some examples, the partial proxy feedback component1235may estimate a SNR gap between the first ACK feedback and the second ACK feedback based on the proxy down-sampling rate. In some examples, the partial proxy feedback component1235may adjust the proxy down-sampling rate to achieve the proxy target error rate based on a difference between a predetermined SNR gap between the proxy target error rate and the target error rate and the estimated SNR gap. In some examples, the partial proxy feedback component1235may transmit the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message.

The intermediate proxy feedback component1240may transmit an indication that the UE is to determine the second ACK feedback based on an intermediate decoding of the communications. In some examples, the intermediate proxy feedback component1240may transmit, via the indication, a number of decoding iterations to be used for the intermediate decoding, where the number of decoding iterations is less than a total number of decoding iterations to be used by the UE for decoding an entirety of the communications and is associated with the intermediate decoding. In some examples, the intermediate proxy feedback component1240may transmit the indication as part of the proxy ACK feedback configuration via RRC signaling or as part of a DCI message. In some cases, the number of decoding iterations may correspond to the proxy target error rate that is greater than the first target error rate.

The multiplexed feedback receiver1245may receive, from the UE, a multiplexed feedback message including the first ACK feedback and the second ACK feedback. In some cases, the second ACK feedback may be received less frequently than the first ACK feedback.

The broadcast channel transmitter1260may configure a UE to monitor the one or more broadcast channel transmissions and to report ACK feedback for the one or more broadcast channel transmissions. In some examples, the broadcast channel transmitter1260may adjust an offset for outer-loop power control of the first wireless communication with the UE based on a known gap between the first target error rate and the second target error rate, where the second target error rate corresponds to an MCS for the one or more broadcast transmissions.

FIG. 13shows a diagram of a system1300including a device1305that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. The device1305may be an example of or include the components of device1005, device1105, or a base station105as described herein. The device1305may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a base station communications manager1310, a network communications manager1315, a transceiver1320, an antenna1325, memory1330, a processor1340, and an inter-station communications manager1345. These components may be in electronic communication via one or more buses (e.g., bus1350).

The base station communications manager1310may transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. Additionally, the base station communications manager1310may transmit, to the UE, the communications associated with the target error rate. In some cases, the base station communications manager1310may receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications. Additionally, the base station communications manager1310may receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate.

Additionally or alternatively, the base station communications manager1310may transmit, to a UE, a first wireless communication associated with a first target error rate. In some cases, the base station communications manager1310may transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate. Additionally, the base station communications manager1310may receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate. In some cases, the base station communications manager1310may adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication.

The memory1330may include RAM, ROM, or a combination thereof. The memory1330may store computer-readable code1335including instructions that, when executed by a processor (e.g., the processor1340) cause the device to perform various functions described herein. In some cases, the memory1330may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

At1405, the UE may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. The operations of1405may be performed according to the methods described herein. In some examples, aspects of the operations of1405may be performed by a proxy feedback configuration receiver as described with reference toFIGS. 6 through 9.

At1410, the UE may receive, from the base station, the communications associated with the target error rate. The operations of1410may be performed according to the methods described herein. In some examples, aspects of the operations of1410may be performed by a low-BLER communications receiver as described with reference toFIGS. 6 through 9.

At1415, the UE may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications. The operations of1415may be performed according to the methods described herein. In some examples, aspects of the operations of1415may be performed by a normal feedback transmitter as described with reference toFIGS. 6 through 9.

At1420, the UE may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. The operations of1420may be performed according to the methods described herein. In some examples, aspects of the operations of1420may be performed by a proxy feedback transmitter as described with reference toFIGS. 6 through 9.

At1505, the UE may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. The operations of1505may be performed according to the methods described herein. In some examples, aspects of the operations of1505may be performed by a proxy feedback configuration receiver as described with reference toFIGS. 6 through 9.

At1510, the UE may receive an indication that the UE is to determine the second ACK feedback based on a subset of LLRs to be used for the communications. The operations of1510may be performed according to the methods described herein. In some examples, aspects of the operations of1510may be performed by a partial decoding component as described with reference toFIGS. 6 through 9.

At1515, the UE may receive, from the base station, the communications associated with the target error rate. The operations of1515may be performed according to the methods described herein. In some examples, aspects of the operations of1515may be performed by a low-BLER communications receiver as described with reference toFIGS. 6 through 9.

At1520, the UE may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications. The operations of1520may be performed according to the methods described herein. In some examples, aspects of the operations of1520may be performed by a normal feedback transmitter as described with reference toFIGS. 6 through 9.

At1525, the UE may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. The operations of1525may be performed according to the methods described herein. In some examples, aspects of the operations of1525may be performed by a proxy feedback transmitter as described with reference toFIGS. 6 through 9.

FIG. 16shows a flowchart illustrating a method1600that supports outer-loop feedback support for low error rates in accordance with aspects of the present disclosure. The operations of method1600may be implemented by a UE115or its components as described herein. For example, the operations of method1600may be performed by a UE communications manager as described with reference toFIGS. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1605, the UE may receive, from a base station, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. The operations of1605may be performed according to the methods described herein. In some examples, aspects of the operations of1605may be performed by a proxy feedback configuration receiver as described with reference toFIGS. 6 through 9.

At1610, the UE may receive an indication that the UE is to determine the second ACK feedback based on an intermediate decoding of the communications. The operations of1610may be performed according to the methods described herein. In some examples, aspects of the operations of1610may be performed by an intermediate decoding component as described with reference toFIGS. 6 through 9.

At1615, the UE may receive, from the base station, the communications associated with the target error rate. The operations of1615may be performed according to the methods described herein. In some examples, aspects of the operations of1615may be performed by a low-BLER communications receiver as described with reference toFIGS. 6 through 9.

At1620, the UE may transmit, to the base station, a first ACK feedback for the communications based on the target error rate and on decoding the communications. The operations of1620may be performed according to the methods described herein. In some examples, aspects of the operations of1620may be performed by a normal feedback transmitter as described with reference toFIGS. 6 through 9.

At1625, the UE may transmit, to the base station, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. The operations of1625may be performed according to the methods described herein. In some examples, aspects of the operations of1625may be performed by a proxy feedback transmitter as described with reference toFIGS. 6 through 9.

At1705, the base station may transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. The operations of1705may be performed according to the methods described herein. In some examples, aspects of the operations of1705may be performed by a proxy feedback configuration transmitter as described with reference toFIGS. 10 through 13.

At1710, the base station may transmit, to the UE, the communications associated with the target error rate. The operations of1710may be performed according to the methods described herein. In some examples, aspects of the operations of1710may be performed by a low-BLER communications transmitter as described with reference toFIGS. 10 through 13.

At1715, the base station may receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications. The operations of1715may be performed according to the methods described herein. In some examples, aspects of the operations of1715may be performed by a normal feedback receiver as described with reference toFIGS. 10 through 13.

At1720, the base station may receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. The operations of1720may be performed according to the methods described herein. In some examples, aspects of the operations of1720may be performed by a proxy feedback receiver as described with reference toFIGS. 10 through 13.

At1805, the base station may transmit, to a UE, a proxy ACK feedback configuration for communications associated with a target error rate that is below a threshold target error rate. The operations of1805may be performed according to the methods described herein. In some examples, aspects of the operations of1805may be performed by a proxy feedback configuration transmitter as described with reference toFIGS. 10 through 13.

At1810, the base station may transmit, to the UE, the communications associated with the target error rate. The operations of1810may be performed according to the methods described herein. In some examples, aspects of the operations of1810may be performed by a low-BLER communications transmitter as described with reference toFIGS. 10 through 13.

At1815, the base station may receive, from the UE, first ACK feedback for the communications based on the target error rate and on a result of the UE decoding the communications. The operations of1815may be performed according to the methods described herein. In some examples, aspects of the operations of1815may be performed by a normal feedback receiver as described with reference toFIGS. 10 through 13.

At1820, the base station may receive, from the UE, a second ACK feedback for the communications based on the proxy ACK feedback configuration, where the second ACK feedback is associated with a proxy target error rate that is greater than the target error rate. The operations of1820may be performed according to the methods described herein. In some examples, aspects of the operations of1820may be performed by a proxy feedback receiver as described with reference toFIGS. 10 through 13.

At1825, the base station may update outer loop power settings for the communications associated with the target error rate based on receiving the second ACK feedback. The operations of1825may be performed according to the methods described herein. In some examples, aspects of the operations of1825may be performed by an outer-loop adjustment component as described with reference toFIGS. 10 through 13.

At1830, the base station may transmit, to the UE, additional communications associated with the target error rate in accordance with the updated outer loop power settings. The operations of1830may be performed according to the methods described herein. In some examples, aspects of the operations of1830may be performed by an outer-loop adjustment component as described with reference toFIGS. 10 through 13.

At1905, the base station may transmit, to a UE, a first wireless communication associated with a first target error rate. The operations of1905may be performed according to the methods described herein. In some examples, aspects of the operations of1905may be performed by a low-BLER communications transmitter as described with reference toFIGS. 10 through 13.

At1910, the base station may transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate. The operations of1910may be performed according to the methods described herein. In some examples, aspects of the operations of1910may be performed by a high-BLER communications transmitter as described with reference toFIGS. 10 through 13.

At1915, the base station may receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate. The operations of1915may be performed according to the methods described herein. In some examples, aspects of the operations of1915may be performed by a high-BLER feedback receiver as described with reference toFIGS. 10 through 13.

At1920, the base station may adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication. The operations of1920may be performed according to the methods described herein. In some examples, aspects of the operations of1920may be performed by an outer-loop adjustment component as described with reference toFIGS. 10 through 13.

At2005, the base station may transmit, to a UE, a first wireless communication associated with a first target error rate. The operations of2005may be performed according to the methods described herein. In some examples, aspects of the operations of2005may be performed by a low-BLER communications transmitter as described with reference toFIGS. 10 through 13.

At2010, the base station may transmit, to the UE, a second wireless communication associated with a second target error rate that is greater than the first target error rate. The operations of2010may be performed according to the methods described herein. In some examples, aspects of the operations of2010may be performed by a high-BLER communications transmitter as described with reference toFIGS. 10 through 13.

At2015, the base station may receive ACK feedback for the second wireless communication, where the ACK feedback is based on successful reception of the second wireless communication in accordance with the second target error rate. The operations of2015may be performed according to the methods described herein. In some examples, aspects of the operations of2015may be performed by a high-BLER feedback receiver as described with reference toFIGS. 10 through 13.

At2020, the base station may adjust an outer-loop power parameter for the first wireless communication based on the ACK feedback for the second wireless communication. The operations of2020may be performed according to the methods described herein. In some examples, aspects of the operations of2020may be performed by an outer-loop adjustment component as described with reference toFIGS. 10 through 13.

At2025, the base station may adjust the first wireless communication based on an offset between a signal quality difference of the first target error rate and the second target error rate. The operations of2025may be performed according to the methods described herein. In some examples, aspects of the operations of2025may be performed by an outer-loop adjustment component as described with reference toFIGS. 10 through 13.