Sequence-Based PUCCH Transmission for Low SNR Reliability
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel coding for uplink control information (UCI) transmission, particularly at low signal-to-noise ratios, which limits the coverage and decoding performance of physical uplink control channels (PUCCH).
Innovation Solution
The implementation of sequence-based transmission for PUCCH, which generates sequences based on UCI payloads and maps them to resource elements without channel coding or modulation, enabling non-coherent transmission and improving decoding performance by eliminating the need for demodulation reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel coding is used for UCI transmission, then error protection is provided, but decoding performance deteriorates at low signal-to-noise ratios
Solution Approach 1:
The patent changes the fundamental parameter of transmission from channel-coded modulation to sequence-based non-coherent transmission. This involves transforming the UCI into a sequence of complex numbers with specific amplitude and phase properties, eliminating the need for traditional channel coding while achieving robust decoding through sequence correlation at the receiver, thereby resolving the contradiction between error protection and decoding performance at low SNR
Solution Approach 2:
The patent substitutes the mechanical channel coding system with a sequence-based transmission system. Instead of using error correction codes combined with modulation, the system directly maps UCI to sequences that can be detected through correlation, replacing the complex interaction of coding and modulation mechanisms with a simpler sequence correlation approach that performs better at low SNR
2Reliability
If channel coding is applied to UCI, then error correction is enabled, but transmission efficiency decreases
Solution Approach 1:
The patent extracts and removes the channel coding component from the traditional UCI transmission system. By taking out the redundant channel coding steps (encoding, modulation, demodulation, decoding) and replacing them with direct sequence mapping and correlation, the system achieves error correction through the inherent properties of the sequences themselves, thereby improving transmission efficiency while maintaining reliability
3Measurement precision
If demodulation reference signals are used, then coherent detection is enabled, but system complexity increases
Solution Approach 1:
The patent extracts and eliminates the demodulation reference signal component from the transmission system. By using non-coherent sequence-based transmission, the system removes the need for separate reference signals and coherent detection mechanisms, reducing system complexity while maintaining detection accuracy through sequence correlation methods that do not require additional reference signals
Data Source
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Figure 3A~3B
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify that an uplink control information (UCI) payload satisfies a threshold size condition. The UE may map the UCI payload to an uplink control sequence. The UE may transmit a physical uplink control channel (PUCCH) that include the uplink control sequence to a base station. The uplink control sequence may be representative of the UCI payload. The base station may receive the PUCCH that includes the uplink control sequence from the UE. The base station may also determine the UCI payload by associating the uplink control sequence with a corresponding sequence index of the one or more sets of uplink control sequences.