SR Priority Differentiation in 5G NR PUCCH CSI Multiplexing
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in differentiating scheduling request (SR) priority when there are collisions between periodic/semi-persistent Channel State Information (CSI) and SR transmissions, especially considering block error rate (BLER) performance requirements for various service types.
Innovation Solution
The solution involves a user equipment (UE) that preprocesses SR information bits and determines the priority of SRs to be transmitted by prepending them to CSI information bits using PUCCH formats 2, 3, or 4, and selectively transmits the PUCCH based on whether a high-priority SR is to be reported, ensuring priority is maintained even when CSI and SR multiplexing cannot be performed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SR and periodic/semi-persistent CSI are multiplexed by appending SR bits to CSI bits, then resource utilization is improved, but SR priority differentiation capability deteriorates
Solution Approach 1:
The patent segments the handling of SR and CSI transmissions by separating them into different PUCCH resources based on priority. High-priority SRs use dedicated PUCCH resources while low-priority SRs can be multiplexed with CSI, enabling priority differentiation while maintaining resource utilization efficiency.
Solution Approach 2:
The patent introduces a new dimension of priority-based resource allocation by configuring multiple PUCCH resources with different priorities. This dimensional separation allows the system to differentiate SR priorities spatially through resource allocation rather than relying solely on bit-level multiplexing.
2Productivity
If SR transmission occasions overlap with periodic/semi-persistent CSI transmission, then resource efficiency is improved, but transmission reliability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different reliability characteristics to different PUCCH resources based on their priority levels. High-priority SR transmissions use resources optimized for reliability with dedicated protection, while low-priority transmissions can share resources with CSI, achieving local optimization of transmission reliability where needed.
3Reliability
If separate PUCCH resources are configured for different service types, then service-specific performance is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a unified PUCCH resource configuration framework that can handle multiple service types and priority levels through a single standardized mechanism. The gNB configures multiple PUCCH resources with different priority indicators, and the UE automatically selects the appropriate resource based on SR priority, providing service-specific performance without requiring separate dedicated systems for each service type.
Data Source
AI summary
A UE is configured to transmit PUCCHs for respective SRs with SR transmission occasions that would overlap with a transmission of a PUCCH with CSI with normal BLER requirements in a resource using PUCCH format 2, 3, or 4 in a subslot of a slot. The UE includes processing circuitry configured to append SR information bits to periodic/semi-persistent CSI information bits using PUCCH format 2, 3, or 4, and transmitting circuitry configured to transmit combined UCI bits, having the periodic/semi-persistent CSI information bits and the SR information bits, in a PUCCH for CSI reporting using the PUCCH resource for the periodic/semi-persistent CSI information bits with PUCCH format 2, 3, or 4. A number of the SR information bits is based on a total number of SRs with all priority configurations, or SRs with low priority configurations, whose PUCCH resources overlap with the PUCCH resource for periodic/semi-persistent CSI in the slot.