CQI Reporting for URLLC via Dynamic BLER Targets
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in optimizing channel quality indicator (CQI) reporting for ultra-reliable low latency communications (URLLC) due to varying block error rate (BLER) targets, which affect reliability and latency requirements.
Innovation Solution
The solution involves determining BLER targets and resource allocation patterns for channel state information reference signals (CSI-RS) based on specific communication services, adjusting transmission power and resource allocation to ensure accurate CQI reporting, and optimizing the number of bits and reporting timeline to balance resource consumption and channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CQI reporting methods are used, then existing communication standards are maintained, but reliability and latency requirements for URLLC services cannot be met
Solution Approach 1:
The patent implements dynamic CQI reporting mechanisms where the reporting timeline, number of bits, and resource allocation patterns are adaptively adjusted based on the required BLER target. The system transitions from static reporting configurations to dynamic ones that can respond to different service requirements, enabling URLLC services to meet their stringent reliability and latency targets.
Solution Approach 2:
The patent changes key parameters including the number of bits for CQI indication, reporting timeline duration, and CSI-RS resource allocation patterns based on the required BLER target. By varying these parameters dynamically, the system can optimize the balance between reporting accuracy, resource consumption, and latency for different communication services.
2Measurement precision
If more bits are used for CQI reporting, then channel estimation accuracy improves, but resource consumption increases
Solution Approach 1:
The patent dynamically adjusts the number of bits used for CQI reporting based on the required BLER target and channel conditions. When higher accuracy is needed, more bits are allocated; when resource constraints are tighter, fewer bits are used. This parameter adaptation enables optimal resource utilization while maintaining sufficient measurement precision.
Solution Approach 2:
The system uses partial CQI reporting where only the necessary number of bits are transmitted based on current requirements. Instead of always using maximum precision, the system applies partial action by reporting only enough information to meet the BLER target, thereby reducing unnecessary resource consumption.
3Loss of time
If shorter reporting timeline is used, then latency is reduced, but channel estimation accuracy may deteriorate
Solution Approach 1:
The patent implements dynamic reporting timeline adjustment where the timeline duration is adapted based on the required BLER target and current channel conditions. For URLLC services requiring low latency, shorter reporting timelines are used. When higher accuracy is needed, the timeline is extended. This dynamic adaptation resolves the contradiction between speed and precision.
Solution Approach 2:
The reporting timeline parameter is changed dynamically based on service requirements. The system can switch between short timelines for low-latency critical communications and longer timelines for services where accuracy is more important than speed, thereby optimizing the trade-off for each specific use case.
4Measurement precision
If more CSI-RS resources are allocated, then channel quality measurement improves, but system overhead increases
Solution Approach 1:
The patent dynamically adjusts the resource allocation pattern for CSI-RS based on the required BLER target and channel conditions. When higher measurement accuracy is needed, more CSI-RS resources are allocated. When system overhead is a constraint, fewer resources are used. This parameter adaptation enables the system to optimize the balance between measurement quality and system complexity.
Solution Approach 2:
The system applies partial action by allocating only the necessary CSI-RS resources needed to meet the BLER target. Instead of always using maximum resource allocation, the system uses partial resources when sufficient accuracy can be achieved with fewer resources, thereby reducing unnecessary system overhead and complexity.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine a block error rate (BLER) target for communications associated with the user equipment; determine a resource allocation pattern for transmission of channel state information reference signals (CSI-RS) based at least in part on the BLER target; and monitor one or more resources, indicated by the resource allocation pattern, for the CSI-RS. Numerous other aspects are provided.