Dynamic CSI-RS Configuration Adaptation for Wireless Devices
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Solution Overview
Problem
Current wireless communication systems, particularly in NR, face inefficiencies in CSI-RS configurations due to excessive power consumption and resource usage, as they often require full port configurations even when maximum capabilities are not needed, leading to inefficient port adaptation and increased RRC signaling.
Innovation Solution
Implementing multiple CSI-RS configurations that can be dynamically switched or deactivated using MAC-CE or DCI signaling, allowing for flexible port number, density, and power control adjustments, enabling faster and more resource-efficient adaptations without full RRC reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full CSI-RS port configurations are used to support maximum network capabilities, then the network can support maximum throughput and coverage, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic CSI-RS port adaptation where the network node can switch between different port configurations (e.g., 1-port, 2-port, 4-port, 8-port, 16-port) based on real-time network conditions and WD requirements. This dynamic adjustment allows the system to use full port configurations only when maximum capability is needed, while reducing port usage during normal operation, thereby resolving the contradiction between maintaining reliability and reducing power consumption.
Solution Approach 2:
The patent changes the parameter of CSI-RS configuration from fixed full-configuration to variable configurations. By introducing configuration indicators that specify different port numbers, densities, and power control settings, the system can adjust CSI-RS parameters to match actual network demands, avoiding unnecessary power consumption while maintaining the ability to support maximum capabilities when required.
2Measurement precision
If the number of TX/RX ports is increased to improve signal detection capability, then signal detection meets predefined criteria, but the number of CSI-RS transmissions increases leading to higher power consumption and resource usage
Solution Approach 1:
The patent applies local quality by configuring CSI-RS with different densities and port allocations in different frequency resources and time slots. Instead of uniformly high-density CSI-RS across all resources, the system can allocate higher density only where signal detection requires it, while using lower density or skipping transmissions in other regions, thus maintaining measurement precision where needed while reducing overall power consumption.
Solution Approach 2:
The patent implements partial action by transmitting CSI-RS only at necessary densities and port configurations rather than always using maximum configurations. The network node can select from multiple configuration options to provide just enough signal detection capability for current conditions, avoiding excessive CSI-RS transmissions that would consume unnecessary power and resources.
3Adaptability or versatility
If frequent CSI-RS configuration changes are implemented to adapt to varying network conditions, then resource efficiency improves, but signaling overhead increases due to full RRC reconfiguration
Solution Approach 1:
The patent segments the CSI-RS configuration into multiple independent components: base configuration parameters and configurable indicators (port number, density, power control). This segmentation allows the network to update only the specific indicator values through efficient MAC-CE or DCI signaling rather than performing complete RRC reconfiguration, thereby maintaining high adaptability while significantly reducing signaling overhead.
Solution Approach 2:
The patent uses preliminary action by pre-configuring multiple CSI-RS configuration options and their corresponding indicators during initial setup. When adaptation is needed, the network simply activates pre-prepared configuration indicators through lightweight signaling rather than creating and transmitting full configuration messages, enabling rapid adaptation with minimal signaling overhead.
Data Source
AI summary
A method, system and apparatus are disclosed. A network node configured to communicate with a wireless device (WD) is described. The network node includes processing circuitry configured to: determine a plurality of channel state information reference signal (CSI-RS) configurations. The determined plurality of CSI-RS configurations includes at least a first CSI-RS configuration and a second CSI-RS configuration. The first and second CSI-RS configurations include different values for at least one parameter. One of the first CSI-RS configuration and the second CSI-RS configuration is determined. A radio interface is configured to transmit, to the WD, an indication indicating the determined one of the first CSI-RS configuration and the second CSI-RS configuration, the indication being transmitted using at least one of physical communication layer signaling and media access control (MAC) layer signaling.