CSI-RS Port Mapping for Base Station Antenna Adaptation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) reference signal port mappings for base station antenna adaptation, leading to suboptimal performance and increased power consumption.
Innovation Solution
A method and apparatus for wireless communication that involve receiving an indication of a set of CSI-RS port mappings for different antenna adaptation levels of a base station and transmitting CSI-RS in accordance with a specific port mapping for a chosen adaptation level, allowing for dynamic adaptation of antenna ports to conserve power while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If base station uses antenna adaptation to reduce power consumption, then power efficiency improves, but CSI measurement accuracy deteriorates
Solution Approach 1:
The patent implements dynamic antenna adaptation where the base station can switch between different antenna ports (full adaptation with all ports, partial adaptation with subset of ports, or non-adaptation with original ports) based on channel conditions and UE requirements. This dynamic switching allows the system to optimize power consumption while maintaining CSI measurement accuracy when needed.
Solution Approach 2:
The patent changes the parameter of antenna port configuration by providing multiple CSI-RS port mapping configurations to the UE. The base station can indicate different port mappings corresponding to different adaptation levels, allowing the UE to accurately measure CSI regardless of which antenna ports are currently active, thus resolving the contradiction between power saving and measurement accuracy.
2Measurement precision
If base station transmits CSI-RS with multiple port mappings for different adaptation levels, then measurement accuracy improves, but signaling complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CSI-RS port mapping configurations and indicating them to the UE in advance. The base station provides a set of possible port mappings corresponding to different adaptation levels, and the UE stores these configurations for later use. This preliminary configuration reduces the need for frequent signaling updates during operation.
Solution Approach 2:
The patent makes the CSI-RS port mapping mechanism universal by designing a single framework that handles multiple adaptation levels (full adaptation, partial adaptation, non-adaptation) through a unified signaling approach. The same RRC signaling and DCI indication mechanisms are used across different scenarios, reducing overall system complexity despite supporting multiple configurations.
3Adaptability or versatility
If base station dynamically switches between different CSI-RS port mappings, then adaptability improves, but processing overhead increases
Solution Approach 1:
The patent implements dynamic switching between different CSI-RS port mappings through a two-layer configuration approach: RRC signaling provides semi-static configuration of multiple port mapping options, while DCI provides dynamic selection among these pre-configured options. This dynamic mechanism allows the base station to adapt to changing channel conditions while minimizing processing overhead by avoiding frequent RRC reconfigurations.
Solution Approach 2:
The patent segments the configuration process into two distinct phases: semi-static RRC configuration that establishes the set of available port mappings, and dynamic DCI indication that selects which mapping to use. This segmentation allows the system to maintain high adaptability while reducing processing overhead by separating configuration from activation.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a set of channel state information reference signal (CSI-RS) port mappings for different antenna adaptation levels of a base station. The UE may receive, from the base station, a CSI-RS in accordance with a first CSI-RS port mapping, from the set of CSI-RS port mappings, for a first antenna adaptation level of the different antenna adaptation levels. Numerous other aspects are described.