Group-Based CSI-RS Triggering via Single DCI
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Solution Overview
Problem
Current New Radio (NR) specifications only allow Channel State Information-Reference Signals (CSI-RS) to be triggered in a UE-specific manner, limiting the ability to trigger CSI-RS transmission for multiple User Equipments (UEs simultaneously, which results in increased DCI overhead.
Innovation Solution
Introducing a new radio network temporary identifier (RNTI) and a new DCI format that supports CSI-RS triggering for multiple UEs, allowing for reduced DCI overhead by enabling the triggering of CSI-RS transmission for multiple UEs using a single DCI, with options for different CSI-RS resources and associated parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI-RS triggering is done in a UE-specific manner using individual DCI for each UE, then each UE can receive its CSI-RS transmission independently, but the DCI overhead increases significantly when multiple UEs need to be triggered simultaneously
Solution Approach 1:
The patent combines multiple UE-specific DCI messages into a single group-based DCI message that can trigger CSI-RS transmissions for multiple UEs simultaneously. This merging approach reduces the total number of DCI messages required while maintaining the ability to independently trigger CSI-RS for each UE in the group, thereby reducing DCI overhead without compromising transmission reliability.
Solution Approach 2:
The group-based DCI message is designed to serve multiple UEs simultaneously, making it a universal triggering mechanism that can accommodate different UE groups. The DCI includes group ID fields and resource allocation information that can be interpreted by multiple UEs based on their specific configurations, allowing one DCI message to perform the function of multiple individual DCI messages.
2Quantity of substance
If a new DCI format is introduced to support group-based CSI-RS triggering for multiple UEs, then DCI overhead is reduced, but the device complexity increases due to the need to process and interpret the new format
Solution Approach 1:
The new DCI format is segmented into distinct fields including group ID, resource allocation, and UE-specific parameters. This segmentation allows UEs to efficiently parse only the relevant portions of the DCI message based on their group membership and configuration, reducing processing complexity compared to a monolithic DCI structure. The segmented format enables modular processing where each field can be handled independently.
Solution Approach 2:
The group ID acts as an intermediary element that bridges the gap between the aggregated DCI message and individual UE processing. UEs use their configured group IDs to identify and filter relevant DCI messages, and the group ID also serves as a key for UEs to retrieve their specific configuration parameters from pre-configured tables, simplifying the interpretation process without requiring complex decoding logic.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided for channel state information (CSI)-reference signal (RS) triggering for multiple user equipments (UEs) using a single downlink control information (DCI). In some embodiments, a new radio network temporary identifier (RNTI) may be used to indicate triggering of CSI-RS transmission for multiple UEs. Additionally, or alternatively, a new DCI format may be used that supports CSI-RS triggering for multiple UEs. The techniques described herein may provide reduced DCI overhead compared with prior techniques. Other embodiments may be described and claimed.