PUCCH Format 3 ACK/NACK Detection Using Dual List-RM Decoding
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Solution Overview
Problem
In LTE wireless communication networks, accurately detecting ACK/NACK bits in PUCCH Format 3 is challenging due to poor channel conditions, which affects the overall downlink performance and requires efficient recovery mechanisms to enhance network performance.
Innovation Solution
The method involves using a Top-M Reed Muller decoder to generate ACK candidates, symbol regeneration, and channel estimation to combine metrics for detecting ACK bits, employing a dual list-RM decoder and symbol regeneration for efficient detection in LTE PUCCH Format 3 uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional decoding methods are used for ACK/NACK bits in PUCCH Format 3, then the device complexity is low, but the measurement precision and reliability deteriorate under poor channel conditions
Solution Approach 1:
The patent segments the decoding process into two distinct phases: first generating Top-M candidate ACK bit sequences using a simplified RM decoder, then evaluating these candidates through channel estimation and metric calculation. This segmentation allows the system to achieve high detection accuracy by thoroughly evaluating multiple candidates without requiring a single overly complex decoder, thus resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent employs partial action by generating only the Top-M most likely ACK candidate sequences rather than exhaustively decoding all possible sequences. The RM decoder parameters are configured to generate a limited set of high-probability candidates (e.g., Top-4 or Top-8), which are then evaluated through channel estimation. This partial approach achieves near-optimal detection accuracy while significantly reducing computational complexity compared to exhaustive decoding.
2Reliability
If dual list-RM decoder with symbol regeneration is employed, then the reliability of ACK/NACK detection improves, but the use of energy and device complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing RM codebook sequences and channel estimation results before the actual ACK/NACK detection. The Top-M candidate generation uses pre-configured RM decoder parameters, and channel estimates are computed in advance for each candidate. This preliminary preparation reduces the real-time processing energy requirement during actual ACK/NACK detection, resolving the contradiction between reliability improvement and energy consumption.
3Measurement precision
If multiple candidate sequences are generated and evaluated, then the measurement precision of ACK/NACK detection improves, but the loss of time in processing increases
Solution Approach 1:
The patent changes the parameter of candidate evaluation by using metric-based ranking (e.g., correlation metric, likelihood metric) to efficiently identify the most probable ACK sequence among Top-M candidates. Instead of equally processing all candidates, the system dynamically adjusts evaluation depth based on metric thresholds, allowing early termination when a sufficiently confident detection is achieved. This parameter optimization maintains high detection accuracy while minimizing processing time.
Data Source
AI summary
Methods and apparatus for detecting ACK/NACK bits with dual list-RM decoder and symbol regeneration for PUCCH format 3. In an exemplary embodiment, a method is provided for detected ACK/NACK bits received in a long-term evolution (LTE) physical uplink control channel (PUCCH) Format 3 uplink transmission. The method includes generating Top-M ACK candidates from a descrambled bit stream, regenerating Top-M candidate symbols from the Top-M ACK candidates, calculating channel estimates for the Top-M candidate symbols, combining to the channel estimates generate a combined metric; and searching the combined metric to determine detected ACK bits.