Polar Code Control Channel Bit Mapping for 5G NR
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently mapping and transmitting control channel information, particularly in 5G NR systems, where diverse performance dimensions and services require enhanced bit and symbol mapping schemes to ensure reliable and seamless connectivity.
Innovation Solution
The proposed solution involves an enhanced bit mapping scheme for control channels using DFT-s-OFDM waveforms, where coded bits are mapped based on bit positions, MIMO layers, and pre-DFT time dimensions, with optional consideration of real and imaginary parts, and quality-based interleaving to optimize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mapping schemes are used for control channel transmission, then device complexity is reduced, but reliability and transmission efficiency deteriorate
Solution Approach 1:
The patent applies local quality by differentiating the mapping process for different bit positions within modulation symbols. Specifically, even-indexed bits and odd-indexed bits are mapped to different MIMO layers based on their respective qualities, allowing each bit position to be transmitted over the most reliable channel available, thereby improving overall transmission reliability without requiring complete redesign of the mapping system
Solution Approach 2:
The patent implements dynamics by making the bit-to-layer mapping configurable and adaptable. The network can dynamically adjust which layers transmit even bits versus odd bits based on real-time channel conditions and service requirements. This dynamic flexibility allows the system to optimize for reliability when needed while maintaining compatibility with traditional schemes when simplicity is prioritized
2Productivity
If quality-based interleaving is applied to optimize transmission efficiency, then productivity improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the coded bit stream into separate even-indexed bit sequences and odd-indexed bit sequences. These segmented sequences are then independently interleaved and mapped to different MIMO layers. This segmentation enables the system to exploit quality differences between layers for each bit group, improving transmission efficiency through targeted resource allocation while keeping the complexity manageable through systematic processing of divided sequences
Solution Approach 2:
The patent introduces another dimension by adding the bit position index (even/odd) as an additional degree of freedom to the traditional mapping process. This dimensional expansion allows the system to consider both the spatial dimension (MIMO layers) and the bit position dimension when optimizing mapping, thereby improving transmission efficiency through more granular control over resource allocation
3Adaptability or versatility
If bits are mapped across MIMO layers and time domains, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by making the mapping configuration flexible and configurable. Different parameters such as which layer receives even bits versus odd bits, the interleaving patterns used, and the time-domain mapping strategies can be adjusted based on service requirements and channel conditions. This parameter-based adaptability allows the same basic mapping framework to serve multiple scenarios without requiring fundamentally different systems for each case
Data Source
AI summary
Various embodiments herein provide techniques for enhanced bit mapping for transmission of control information (e.g., uplink control information (UCI) and/or downlink control information (DCI)). Other embodiments may be described and claimed.