5G PUCCH Resource Mapping for Uplink Control Reliability
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Solution Overview
Problem
Current communication systems lack a method to effectively send physical uplink control channels in 5G systems, specifically for formats 3 and 4, which are essential for transmitting HARQ-ACK, type 1 CSI, and type 2 CSI simultaneously, as existing methods do not follow the necessary rules for mapping encoded bit sequences to OFDM symbols.
Innovation Solution
The proposed solution involves determining N OFDM symbol sets within a physical uplink control channel resource, where the first encoded bit sequence is mapped to OFDM symbols close to those carrying a DMRS, ensuring even distribution and maximizing diversity gain, and the second encoded bit sequence is independently encoded and distributed across OFDM symbols based on priority, to achieve reliable transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first encoded bit sequence is mapped to OFDM symbols close to DMRS symbols, then the reliability and diversity gain are improved, but the device complexity increases due to the need to determine N OFDM symbol sets and mapping rules
Solution Approach 1:
The physical uplink control channel resource is segmented into N OFDM symbol sets, where each set contains one or more OFDM symbols. This segmentation allows the first encoded bit sequence to be distributed across multiple symbol sets with specific mapping rules that prioritize proximity to DMRS symbols, thereby improving reliability while managing complexity through structured organization
Solution Approach 2:
Different OFDM symbols are assigned different priorities based on their proximity to DMRS symbols. The mapping rule assigns higher priority to symbols closer to DMRS, creating local quality variations in the bit sequence distribution. This ensures that critical bits are placed in more reliable positions while maintaining overall system performance
2Reliability
If the second encoded bit sequence is independently encoded and distributed based on priority, then the transmission reliability is improved, but the device complexity increases due to independent encoding and distribution requirements
Solution Approach 1:
The second encoded bit sequence is independently encoded and then distributed across available OFDM symbols based on priority assignments. This segmentation approach allows separate optimization of encoding and distribution processes, improving reliability through independent error protection while managing complexity through modular processing steps
Solution Approach 2:
Priority assignments for OFDM symbols are determined in advance before the actual bit sequence mapping. This preliminary action establishes a clear framework for distributing the second encoded bit sequence, reducing real-time complexity while ensuring optimal placement for maximum reliability
3Reliability
If N OFDM symbol sets are determined within the physical uplink control channel resource, then the diversity gain is maximized, but the loss of time increases due to the additional determination and mapping process
Solution Approach 1:
The determination of N OFDM symbol sets and the establishment of mapping rules are performed as preliminary configurations rather than real-time computations. This allows the system to prepare the structural framework in advance, reducing the time required during actual data transmission while still achieving maximum diversity gain through the multi-set configuration
Data Source
AI summary
A terminal device determines a resource of a physical uplink control channel. The physical uplink control channel carries a first encoded bit sequence and a second encoded bit sequence, the first encoded bit sequence is corresponding to first uplink control information, and the second encoded bit sequence is corresponding to second uplink control information. The resource for the physical uplink control channel includes N orthogonal frequency division multiplexing (OFDM) symbol sets. The first encoded bit sequence is carried in an OFDM symbol included in j OFDM symbol sets, the j OFDM symbol sets are a part of or all of of the N OFDM symbol sets, where j is a positive integer less than or equal to N. The terminal device sends, on the resource for the physical uplink control channel, a signal that is generated based on the first uplink control information and the second uplink control information.