UE Multiplexing Priority HARQ-ACK Bits in PUCCH
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Solution Overview
Problem
Current 5G NR systems face challenges in efficiently multiplexing high and low priority HARQ-ACK bits, leading to potential spectral inefficiencies and throughput issues due to the need to drop low priority transmissions in cases of resource overlap, which can be detrimental for spectral efficiency and user perceived throughput.
Innovation Solution
The implementation of a user equipment (UE) configured to decode and multiplex first and second priority HARQ-ACK codebooks using overlapping PUCCH resources, where the UE determines the number of symbols and resource allocation based on priority levels, allowing for flexible resource management without sacrificing Quality of Service (QoS) for either service type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate PUCCH resources are allocated for high priority and low priority HARQ-ACK bits, then resource allocation is simple, but spectral efficiency deteriorates when resources overlap
Solution Approach 1:
The patent merges high priority and low priority HARQ-ACK bits into a single PUCCH resource for transmission. The UE multiplexes both priority levels of HARQ-ACK bits in the same PUCCH resource, allowing simultaneous transmission without dropping low priority transmissions, thereby improving spectral efficiency while maintaining resource allocation simplicity through unified resource management
2Reliability
If low priority HARQ-ACK transmissions are dropped during resource overlap, then high priority transmissions are guaranteed, but throughput deteriorates
Solution Approach 1:
The patent implements dynamic priority handling where the UE determines the highest priority among overlapping transmissions and multiplexes both high and low priority HARQ-ACK bits in the same PUCCH resource. This dynamic approach ensures high priority transmissions are maintained while also transmitting low priority transmissions, preventing throughput deterioration through inclusive multiplexing rather than dropping low priority transmissions
3Loss of energy
If HARQ-ACK bits of different priorities are multiplexed in the same PUCCH resource, then spectral efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into first priority HARQ-ACK bits and second priority HARQ-ACK bits, allowing the UE to identify and multiplex each priority level separately within the same PUCCH resource. This segmentation approach enables structured multiplexing that improves spectral efficiency while managing device complexity through organized bit handling and priority-based processing
Data Source
AI summary
A user equipment (LTE) for operation in a fifth-generation system (5GS) is configured to decode configuration information for a first hybrid-automatic repeat request (HARQ) acknowledgement (ACK) (HARQ-ACK) codebook for first priority HARQ-ACK bits and for a second HARQ-ACK codebook for second priority HARQ-ACK bits. The configuration information may indicate a physical uplink control channel (PUCCH) resource for the first HARQ-ACK codebook and a PUCCH resource for the second HARQ-ACK codebook. The UE may multiplex the first priority HARQ-ACK bits and the second priority HARQ-ACK bits in a PUCCH transmission when the PUCCH resources for the first and the second HARQ-ACK codebooks overlap. The LTE may use the PUCCH resource for the higher priority HARQ-ACK bits to multiplex the first priority HARQ-ACK bits and the second priority HARQ-ACK bits.