Polar Coding for Uplink Control With Unequal Error Protection
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Solution Overview
Problem
Existing wireless communication systems do not efficiently utilize polar codes for uplink control information, leading to suboptimal information throughput due to bit repetition techniques that detrimentally impact coding gain.
Innovation Solution
The described techniques improve polar code utilization by segmenting control information based on priority, providing unequal error protection, and using adaptive coding rates, allowing early decoding and enhanced decoder power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bit repetition techniques are used to transmit control information, then reliability is improved, but information throughput deteriorates and coding gain is lost
Solution Approach 1:
The control information is segmented into multiple parts, with different segments assigned to different priority levels. High-priority segments are encoded with stronger error protection while low-priority segments use weaker protection, eliminating the need for uniform bit repetition across all segments and thereby improving throughput while maintaining reliability for critical information.
Solution Approach 2:
Different error protection schemes are applied to different segments of control information based on their priority. High-priority segments receive enhanced protection through polar codes with appropriate code rates, while low-priority segments use standard protection, optimizing the balance between reliability and throughput for each segment locally.
2Reliability
If uniform error protection is applied to all control information segments, then reliability is maintained, but coding gain is reduced
Solution Approach 1:
The patent applies different error protection levels to different segments of control information based on priority. High-priority segments receive stronger protection while low-priority segments receive weaker protection, eliminating the need for uniform strong protection across all segments and thereby recovering coding gain while maintaining reliability where needed.
Solution Approach 2:
The error protection parameters (code rate, redundancy level) are changed based on the priority of each control information segment. By dynamically adjusting these parameters rather than using fixed uniform protection, the system achieves better coding gain while maintaining appropriate reliability levels for each segment type.
3Device complexity
If all control information is encoded together, then simplicity is maintained, but decoding efficiency and power consumption are worsened
Solution Approach 1:
Control information is segmented into high-priority and low-priority parts that can be decoded independently or sequentially. The high-priority segment can be decoded first and potentially terminate the decoding process early, reducing the computational load and power consumption of the decoder while maintaining manageable encoding complexity.
Solution Approach 2:
The high-priority control information segment is prepared and encoded separately in advance, allowing the decoder to process and potentially terminate after decoding this critical segment. This preliminary separation enables early termination capability that significantly reduces decoder power consumption without requiring complex joint decoding of all segments.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A transmitter may generate a first segmentation based on a first subset of control information and a second segmentation based on jointly encoding the first subset and a second subset of the control information. The transmitter may polar encode the first segmentation to generate a first codeword and the second segmentation to generate a second codeword, and transmit the first and second codewords. A receiver may determine a first bit sequence corresponding to the first subset based on decoding a first codeword and determine an error detection code (EDC) and a second bit sequence corresponding to the second subset based on decoding a second codeword. The receiver may perform error detection on the first and second bit sequences based on the determined EDC, and output the first bit sequence and the second bit sequence or a decoding error.