Adaptive Scheduling Request Configuration for Low-Latency PUCCH
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Solution Overview
Problem
Existing scheduling request (SR) configurations in wireless communication systems lead to inefficient PUCCH resource usage and increased latency due to hard partitions between different SR types or priorities, and infrequent SR occasions, especially for delay-sensitive uplink traffic.
Innovation Solution
Adaptive SR configurations that can be dynamically activated or deactivated based on trigger events, combined with PDCCH configurations and discontinuous reception (DRX) states, and utilize mixed PUCCH formats (single-bit and multi-bit) to optimize resource allocation and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hard partitions are used between different SR types or priorities, then SR configuration is simplified, but PUCCH resource usage efficiency deteriorates and latency increases
Solution Approach 1:
The patent applies dynamics by transitioning from static hard partitions to dynamic SR configurations that can be activated or deactivated based on trigger events. The network node dynamically selects between first and second SR configurations based on real-time conditions, allowing flexible adaptation to different traffic types and priorities without requiring separate dedicated resources for each SR type, thereby improving resource efficiency while maintaining manageable complexity
Solution Approach 2:
The patent implements universality by enabling a single SR configuration to serve multiple SR types and priorities through dynamic activation. The first and second SR configurations can each be associated with multiple SR types, allowing one configuration to perform multiple functions. This eliminates the need for separate dedicated PUCCH resources for each SR type, improving overall resource usage efficiency while maintaining the ability to handle different priorities
2Quantity of substance
If infrequent SR occasions are used, then PUCCH resource usage is reduced, but latency for delay-sensitive traffic increases
Solution Approach 1:
The patent applies dynamics by configuring different SR occasion frequencies for different SR types and priorities. Delay-sensitive traffic can be configured with more frequent SR occasions to reduce latency, while less time-sensitive traffic uses less frequent occasions to conserve PUCCH resources. The network node dynamically selects appropriate configurations based on the trigger event, optimizing the balance between resource usage and latency for each specific case
Solution Approach 2:
The patent implements local quality by assigning different SR configuration parameters to different SR types and priorities. Each SR type receives tailored configuration characteristics - delay-sensitive traffic gets more frequent occasions with lower latency requirements, while bulk traffic uses less frequent occasions. This localized optimization allows the system to reduce overall PUCCH resource usage through less frequent occasions for non-critical traffic while maintaining low latency for critical traffic through more frequent occasions
3Productivity
If single-bit PUCCH format is used, then resource efficiency is improved, but information capacity is reduced
Solution Approach 1:
The patent applies segmentation by dividing the SR configuration into multiple types (first SR configuration and second SR configuration) that can be selectively activated. Each configuration can be associated with different PUCCH formats - single-bit format for resource-efficient general SRs and multi-bit format for SRs requiring additional information. This segmentation allows the system to use the more efficient single-bit format for most cases while reserving multi-bit format for specific scenarios where higher information capacity is needed
Solution Approach 2:
The patent implements parameter changes by allowing dynamic selection between different PUCCH formats based on the SR configuration type and trigger event. The network node can change the PUCCH format parameter from single-bit to multi-bit depending on the specific SR requirements. This parameter flexibility enables the system to optimize resource efficiency by using single-bit format for standard SRs while switching to multi-bit format when additional information capacity is required for specific SR types
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a scheduling request (SR) configuration. The UE may activate the SR configuration in accordance with a trigger event. The UE may transmit an SR in a physical uplink control channel (PUCCH) occasion associated with the SR configuration. The UE may monitor a physical downlink control channel (PDCCH) search space for a PDCCH that carries an uplink grant associated with the SR. Numerous other aspects are described.