PUCCH Resource Element Mapping to Align High- and Low-Priority UCI
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately decoding uplink control information (UCI) due to misalignment between the actual and expected UCI payload sizes, leading to decoding failures at the network entity.
Innovation Solution
The method involves separately encoding high priority (HP) and low priority (LP) UCI, quantizing the LP UCI payload size, and performing frequency distributed RE mapping to ensure the UE's RE mapping matches the network's expectations, using equations to determine the number of resource blocks and resource elements for accurate transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If UCI payload size is not quantized, then actual payload size is used for mapping, but misalignment between UE and network expectations causes decoding failures
Solution Approach 1:
The patent applies parameter changes by introducing quantization to the UCI payload size parameter. The actual payload size is quantized to a reference payload size, which then serves as the basis for resource element mapping. This parameter transformation ensures that both UE and network use the same quantized value for mapping decisions, eliminating misalignment and decoding failures while maintaining mapping precision.
2Reliability
If frequency distributed RE mapping is used, then frequency diversity is maintained for high priority UCI, but mapping complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the UCI mapping process into distinct segments: high priority UCI mapping and low priority UCI mapping. The frequency distributed RE mapping is applied specifically to high priority UCI segments, while low priority UCI uses a different mapping approach. This segmentation allows frequency diversity to be maintained for critical high priority UCI without unnecessarily complicating the entire mapping process.
3Reliability
If separate encoding of HP and LP UCI is implemented, then decoding reliability is improved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by separately encoding high priority UCI and low priority UCI into distinct bit sequences. This allows each type of UCI to be processed and mapped independently, improving decoding reliability through priority-based processing. The segmentation is implemented at the bit level, which minimizes the increase in processing complexity while achieving the reliability benefits.
4Reliability
If quantized payload size is used for mapping, then alignment with network expectations is achieved, but information loss occurs
Solution Approach 1:
The patent applies parameter changes by quantizing the payload size parameter to a reference payload size for mapping purposes. This quantization ensures alignment between UE and network expectations. The actual payload size information is preserved separately in the UCI structure, so while the mapping parameter is simplified through quantization, no critical information is lost.
Data Source
AI summary
Aspects of the present disclosure provide techniques for multiplexing high priority uplink control information (UCI) and low priority UCI on a physical uplink control channel (PUCCH). A method includes determining a total number of resource blocks to transmit encoded UCI bits based on a quantized payload size of a second one or more encoded UCI bits of a second priority and a non-quantized payload size of a first one or more encoded UCI bits of a first priority. The method generally includes mapping the second one or more encoded UCI bits to a first number of resource elements associated with the quantized payload size and the first one or more encoded UCI bits to a second number of REs and transmitting the encoded UCI bits in a PUCCH in accordance with the mapping.