PUCCH Resource Indication for Flexible CSI and HARQ Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently and flexibly allocating Physical Uplink Control Channel (PUCCH) resources for Channel State Information (CSI) feedback, particularly in New Radio (NR) networks, leading to uncertainties and inefficiencies in resource utilization.
Innovation Solution
A method for dynamic PUCCH resource allocation is introduced, where a CSI request field and a PUCCH resource indicator are included in the Downlink Control Information (DCI) message to determine the appropriate PUCCH resources for CSI reporting, allowing separate or combined transmission of CSI and Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) based on the presence of a CSI request and downlink grant in the DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic PUCCH resource allocation for CSI feedback is implemented, then scheduling flexibility and multi-user capacity are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements dynamic PUCCH resource allocation where the PUCCH resource indicator in DCI messages can dynamically indicate different PUCCH resources for CSI feedback based on current network conditions and user requirements. This allows the system to adapt scheduling flexibility in real-time while the UE follows predetermined rules for interpretation, balancing adaptability with manageable complexity
Solution Approach 2:
The PUCCH resource indicator field in DCI messages is designed to serve multiple functions: indicating PUCCH resources for HARQ-ACK feedback, CSI feedback, and combinations thereof. This multi-functionality improves scheduling flexibility and resource utilization while avoiding the need for separate dedicated fields, thereby limiting the increase in device complexity
2Productivity
If separate PUCCH resources are allocated for CSI and HARQ-ACK feedback, then resource utilization efficiency is improved, but control channel overhead and resource management complexity increase
Solution Approach 1:
The patent segments PUCCH resources into different types (first PUCCH resources for HARQ-ACK only, second PUCCH resources for CSI only, third PUCCH resources for combined CSI and HARQ-ACK). The DCI format includes specific indicators that segment the resource selection process, allowing efficient resource utilization while providing clear rules for UE to follow, thereby limiting management complexity
Solution Approach 2:
The system changes the interpretation of the PUCCH resource indicator parameter based on the presence of CSI requests and downlink grants in the DCI message. When a CSI request is present, the indicator points to second or third PUCCH resources; when absent, it points to first PUCCH resources. This parameter-based resource allocation improves efficiency while keeping the mechanism manageable through predefined interpretation rules
3Measurement precision
If PUCCH resource indicator interpretation depends on CSI request and downlink grant presence, then resource allocation precision is improved, but processing complexity and uncertainty increase
Solution Approach 1:
The patent establishes predetermined rules and configurations for interpreting the PUCCH resource indicator based on the presence of CSI requests and downlink grants. The UE is pre-configured with multiple PUCCH resource sets and the interpretation rules, so when a DCI message is received, the UE can quickly determine the appropriate resource without complex real-time decision-making, thus limiting processing complexity while maintaining precision
Solution Approach 2:
The PUCCH resource indicator acts as an intermediary parameter that mediates between the DCI message content (CSI request presence, downlink grant presence) and the actual PUCCH resource selection. This intermediary simplifies the processing by providing a single field that encapsulates the resource selection logic, reducing uncertainty and processing complexity while maintaining allocation precision
Data Source
AI summary
Systems and methods for triggering CSI reporting on PUCCH are described herein. A network node transmits a downlink-related control message including a Channel State Information (CSI) request field and a Physical Uplink Control Channel (PUCCH) resource indicator. A wireless device receives the control message and determines to trigger a CSI report in accordance with the CSI request field and the PUCCH resource indicator.