NR Tracking Reference Signal Configuration With CSI-RS Resource Sharing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing reference signal overhead, particularly in new radio (NR) systems, which can lead to increased signaling overhead due to relatively fixed configurations of tracking reference signals (TRS), impacting time-frequency synchronization and Doppler spread/shift estimation.
Innovation Solution
Implementing a flexible configuration method for channel state information reference signal (CSI-RS) resources, using enhanced RRC signaling to indicate CSI-RS resources dedicated for TRS purposes, allowing joint utilization of multiple reference signals with reduced signaling overhead, and defining different combinations of CSI-RS resource sets and synchronization signal block (SSB) resources for fine time-frequency tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed configurations of tracking reference signals (TRS) are used, then time-frequency synchronization and Doppler spread/shift estimation are enabled, but reference signal overhead increases
Solution Approach 1:
The patent applies multi-functionality by enabling CSI-RS resources to serve dual purposes: channel state information acquisition and time-frequency tracking. The network can indicate that certain CSI-RS resources are used for TRS purposes, allowing these resources to perform both channel estimation and synchronization functions simultaneously, thereby reducing the need for separate dedicated TRS resources and lowering overall reference signal overhead.
Solution Approach 2:
The patent merges the functions of channel state information reference signals and tracking reference signals into a unified resource allocation framework. By combining CSI-RS and TRS functions into a single resource configuration system with indication mechanisms, the patent eliminates redundant signaling and reduces the total quantity of reference signals required while maintaining both channel estimation and time-frequency tracking capabilities.
2Measurement precision
If multiple reference signals are used for tracking, then time-frequency synchronization accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent introduces dynamic configuration capabilities where the network can flexibly allocate and indicate TRS resources based on actual system conditions. The RRC configuration allows dynamic selection of which CSI-RS resources to use for TRS purposes, enabling adaptive resource allocation that maintains synchronization accuracy while minimizing signaling overhead by only configuring what is currently needed.
Solution Approach 2:
The patent utilizes parameter changes in the RRC configuration structure to control TRS resource allocation. By modifying configuration parameters such as resource set identifiers, indication flags, and mapping relationships, the system can dynamically adjust the number and type of reference signals used for tracking, thereby controlling signaling overhead while maintaining required measurement precision.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for time and frequency tracking reference signal (TRS) use in new radio (NR) are provided. One method may include defining an information element as a part of a channel state information reference signal (CSI-RS) resource set definition to indicate, to a user equipment, the channel state information reference signal (CSI-RS) resource(s) or synchronization signal block (SSB) resources used for tracking reference signal (TRS) purposes. The method may then include transmitting the information element to the user equipment to make it aware of the channel state information reference signal (CSI-RS) resources within one or more channel state information reference signal (CSI-RS) resource sets targeted for tracking reference signal (TRS) specific operation.