PUCCH Format Selection for SR and HARQ-ACK Priority Differentiation
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Solution Overview
Problem
Current 3GPP specifications lack support for priority differentiation of scheduling request (SR) transmissions with hybrid automatic repeat request-acknowledgment (HARQ-ACK) codebooks of different service types, which is essential for next-generation wireless communication networks like 5G new radio (NR).
Innovation Solution
A user equipment (UE) is configured to append SR information bits to HARQ-ACK information bits using PUCCH formats 2, 3, or 4, and determine which PUCCH to transmit based on the priority of the HARQ-ACK information and the states and priorities of the SRs, thereby enabling priority differentiation of SR transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple HARQ-ACK codebooks are supported for different service types, then the system can differentiate priorities of transmissions, but the complexity of managing and selecting appropriate PUCCH resources increases
Solution Approach 1:
The patent changes the parameter of PUCCH format selection based on the priority of HARQ-ACK information. High-priority HARQ-ACK uses PUCCH format 0 or 1, while low-priority HARQ-ACK uses PUCCH format 2, 3, or 4. This parameter change enables priority differentiation while providing clear rules for resource selection, managing system complexity through defined parameters rather than arbitrary decisions
Solution Approach 2:
The patent segments PUCCH resources into different formats based on priority levels. By dividing the PUCCH resource space into format groups (0/1 for high priority, 2/3/4 for low priority), the system creates distinct resource pools for different service types, making it easier to manage and select appropriate resources without overwhelming complexity
2Reliability
If SR priority is considered at the PHY layer, then SR transmissions can be properly prioritized, but the processing complexity at the UE increases
Solution Approach 1:
The patent introduces a priority parameter for SR transmissions at the PHY layer. By defining SR priority as a specific parameter that can be indicated through PUCCH resource selection, the system enables priority handling without requiring complex PHY layer processing. The priority is conveyed through existing resource selection mechanisms rather than adding new processing functions
Solution Approach 2:
The patent uses PUCCH resource selection as an intermediary to convey SR priority information. Instead of directly processing SR priority at the PHY layer, the system uses the choice of PUCCH resource (format 0/1 vs. 2/3/4) as a mediator to indicate priority levels, simplifying PHY layer processing while maintaining priority differentiation capability
3Productivity
If SR information bits are appended to HARQ-ACK information bits, then overlapping transmissions can be consolidated, but the PUCCH resource requirements become more complex
Solution Approach 1:
The patent merges SR and HARQ-ACK transmissions by appending SR information bits to HARQ-ACK information bits when their transmission occasions overlap. This consolidation improves productivity by reducing the number of separate transmissions. The merging is governed by clear rules based on PUCCH format and priority, which manages the complexity of resource configuration through systematic rather than ad-hoc approaches
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 subslot based HARQ-ACK information 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 subslot based HARQ-ACK information bits using PUCCH format 2, 3, or 4. The UE includes transmitting circuity configured to transmit UCI bits, having the HARQ-ACK and SR information bits, in a PUCCH using the PUCCH resource for the subslot based HARQ-ACK 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 high priority configurations, whose PUCCH resources overlap with the subslot based HARQ-ACK PUCCH resource in the subslot of the slot.