CSI-RS Configuration via SSB Indices for 5G Mobility
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Solution Overview
Problem
In 5G wireless systems, configuring and transmitting Channel State Information Reference Signals (CSI-RS) for inter-cell mobility is inefficient, leading to unnecessary CSI-RS configurations and measurements, which can overwhelm the network and reduce performance.
Innovation Solution
The method involves forwarding synchronization signal block measurements and indices to a network element, requesting CSI-RS configurations only for relevant indices, and transmitting these configurations to user equipment, allowing for targeted CSI-RS measurements and reducing unnecessary transmissions and measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI-RS configurations are provided for all possible indices, then measurement coverage is improved, but network load and resource utilization increase
Solution Approach 1:
The patent extracts and transmits only the subset of CSI-RS configurations corresponding to the strongest SSB indices (e.g., top 1, 2, or 3) rather than all possible configurations. This selective extraction reduces the quantity of configuration data transmitted over the air interface while ensuring that the most relevant measurements are available, thus reducing network load while maintaining measurement coverage for critical beams.
Solution Approach 2:
The patent applies local quality by providing different levels of CSI-RS configuration detail to different UEs based on their specific needs and the identified strongest SSB indices. Each UE receives customized configuration information tailored to its serving cell and target cell scenarios, rather than a uniform comprehensive configuration, optimizing resource utilization while maintaining necessary measurement capabilities.
2Measurement precision
If CSI-RS measurements are performed for all indices, then measurement precision is improved, but processing time and complexity increase
Solution Approach 1:
The patent implements partial action by configuring CSI-RS measurements only for the necessary subset of indices corresponding to the strongest SSB beams rather than all possible indices. This partial measurement approach maintains sufficient precision for handover decisions while significantly reducing the time and processing complexity required, as the UE focuses measurements on only the most relevant beams.
3Adaptability or versatility
If comprehensive CSI-RS configuration is transmitted, then adaptability is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-identifying and transmitting the indices of the strongest SSB beams before CSI-RS configuration is provided to the UE. This preliminary identification of relevant beams allows the subsequent CSI-RS configuration to be focused and optimized, reducing the complexity of configuration processing while maintaining adaptability for handover scenarios. The UE already knows which beams are most relevant before receiving detailed CSI-RS configuration.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for configuration and transmission of a channel state information reference signal (CSI-RS). A method may include forwarding, to a network element, synchronization signal block measurements of a target cell along with synchronization signal block indices. The method may also include requesting the network element to provide a channel state information reference signal configuration for a channel state information reference signal index whose source reference signal corresponds to at least one of the synchronization signal block indices. The method may further include receiving the channel state information reference signal configuration from the network element. In addition, the method may include transmitting the channel state information reference signal configuration to a user equipment. Further, the method may include receiving a measurement report on the channel state information reference signal index according to the channel state information reference signal configuration.