HARQ-ACK Power Control Using Actual Bit Counts
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Solution Overview
Problem
User equipment (UE) in wireless communication systems face challenges in accurately determining the number of bits for transmit power calculation in HARQ-ACK transmissions, leading to potential interference with other UEs and inefficient power resource usage due to the inability to distinguish between dummy and actual bits in deferred semi-persistent scheduling (SPS) and retransmitted HARQ-ACK codebooks.
Innovation Solution
The UE obtains the number of actual and dummy bits associated with HARQ-ACK transmissions and adjusts the transmit power for the physical uplink control channel (PUCCH) based on these counts, using either the actual, dummy, or total bit numbers to optimize power usage and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits HARQ-ACK with higher transmit power to ensure reliable delivery, then the reliability of HARQ-ACK transmission is improved, but interference with other UEs increases and power resources are wasted
Solution Approach 1:
The patent changes the parameter used for power calculation from total bit count to actual bit count. By identifying and excluding dummy bits from the power calculation formula, the transmit power is adjusted to match the true information content, reducing unnecessary interference while maintaining reliable delivery of actual HARQ-ACK data.
2Reliability
If the UE transmits HARQ-ACK with higher transmit power to ensure reliable delivery, then the reliability of HARQ-ACK transmission is improved, but power resource consumption increases
Solution Approach 1:
The patent modifies the power calculation parameter by using only the count of actual bits rather than total bits (including dummy bits). This parameter change directly reduces the calculated transmit power level, thereby decreasing UE power resource consumption while still ensuring sufficient power for reliable transmission of the actual HARQ-ACK information.
3Device complexity
If the UE cannot distinguish between dummy bits and actual bits, then the device complexity is reduced, but the measurement precision of bit count for power calculation deteriorates
Solution Approach 1:
The patent applies preliminary action by having the network node pre-identify and mark dummy bits before transmission. The UE then uses this pre-provided information to accurately distinguish dummy bits from actual bits when calculating transmit power, achieving precise measurement without increasing UE processing complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network node provides auxiliary information (dummy bit identification) that mediates between the simple UE structure and the need for accurate bit count measurement. This intermediary information enables precise power calculation without requiring complex UE processing capabilities.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication to retransmit a hybrid automatic repeat request acknowledgement (HARQ-ACK). The HARQ-ACK corresponds to a HARQ-ACK transmission type of a set of HARQ-ACK transmission types, the set comprising two or more of: first HARQ-ACK information, second HARQ-ACK information, and third HARQ-ACK information. In some examples, the first HARQ-ACK information may correspond to a retransmitted HARQ-ACK codebook, the second HARQ-ACK information may correspond to a standard HARQ-ACK, and the third HARQ-ACK information may correspond to a deferred SPS HARQ-ACK. The UE may transmit a HARQ-ACK transmission including a concatenation of at least two HARQ-ACK transmission types of the set of HARQ-ACK transmission types. Numerous other aspects are described.