PUCCH Resource Indication for Multi-TRP UCI Reliability
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Solution Overview
Problem
The existing PUCCH resource transmission mode in 5G NR systems fails to meet the low latency and high reliability requirements of Ultra Reliable Low Latency Communication (URLLC) due to inadequate transmission quality and delay.
Innovation Solution
A method for indicating PUCCH resources that support joint transmission to multiple transmission reception points (TRPs) or antenna panels, allowing repeated transmission of uplink control information (UCI) in one or multiple time slots using a target PUCCH resource, determined through control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PUCCH resource transmission mode is used, then device complexity is reduced, but transmission reliability and coverage are insufficient for URLLC requirements
Solution Approach 1:
The PUCCH resource is segmented into multiple transmission occasions across different time slots, with each occasion targeted to different TRPs. This segmentation enables repeated transmissions to multiple destinations, improving reliability through diversity while maintaining manageable complexity through structured resource division.
Solution Approach 2:
The patent implements a nested structure where PUCCH resources are organized hierarchically: resource sets contain multiple resources, each resource contains multiple transmission occasions, and each occasion targets specific TRPs. This nesting allows systematic management of complexity while enabling comprehensive multi-TRP coverage.
2Reliability
If repeated transmission to multiple TRPs is implemented, then transmission quality and coverage are improved, but transmission time and latency increase
Solution Approach 1:
The patent performs preliminary configuration of PUCCH resource sets and transmission parameters before actual UCI transmission. This pre-configuration includes defining multiple resource sets with different repetition factors and TRP associations, allowing the system to quickly select and execute appropriate transmission strategies without excessive processing delay during actual transmission.
Solution Approach 2:
The patent implements periodic repeated transmissions of UCI across multiple time slots with structured intervals. By organizing transmissions in periodic patterns with predetermined repetition factors, the system achieves reliable delivery through multiple attempts while optimizing the timing structure to minimize overall latency compared to ad-hoc retransmission strategies.
3Adaptability or versatility
If PUCCH resources are configured for joint transmission to multiple TRPs, then adaptability to different communication scenarios is improved, but resource configuration complexity increases
Solution Approach 1:
The patent creates a universal PUCCH resource configuration framework that can serve multiple functions and scenarios. The same resource set structure supports both single-TRP and multi-TRP transmissions, different repetition factors, and various UCI types. This multi-functionality achieves high adaptability while reducing configuration complexity by avoiding separate specialized configurations for each scenario.
Data Source
AI summary
A PUCCH resource indication method includes: obtaining a target PUCCH resource which is indicated for a UE and can support joint transmission to multiple TRPs of a base station, and repeatedly transmitting UCI to the multiple TRPs of the base station in one time slot or among multiple time slots by using the target PUCCH resource.