Semi-Persistent CSI Reporting for Secondary Cell Activation
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Solution Overview
Problem
Current mobile and wireless telecommunication systems face challenges in reducing channel state information (CSI) reporting time for secondary cell activation, particularly in 5G networks, where frequent CSI reporting leads to overhead and limits radio resource configuration, while existing methods like periodic and aperiodic reporting are less than optimal.
Innovation Solution
Implementing a semi-persistent (SP) CSI reporting framework that configures User Equipment (UE) with multiple SP CSI configurations during secondary cell activation, allowing for reduced CSI reporting time by transmitting a CSI report as soon as measurements are available and deactivating SP reporting upon receiving a downlink or uplink grant, thereby minimizing overhead and optimizing link adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent periodic CSI reporting is used during secondary cell activation, then channel state information is continuously updated, but signaling overhead increases and activates radio resources unnecessarily
Solution Approach 1:
The patent implements periodic CSI reporting with configurable periodicity values (e.g., 1ms, 2ms, 4ms, 8ms, 16ms, 32ms, 64ms, 128ms, 256ms, 512ms, 1024ms, 2048ms, 4096ms, 8192ms, 16384ms, 32768ms) that allow the system to update channel state information at optimized intervals rather than continuously, thereby maintaining reliability while reducing signaling overhead during secondary cell activation
Solution Approach 2:
The patent dynamically switches between different CSI reporting modes (periodic, aperiodic, semi-persistent) and adjusts reporting parameters based on activation phase and network conditions. The UE receives activation commands that specify whether to use periodic or aperiodic reporting, and the system adapts the reporting behavior accordingly to balance accuracy requirements with overhead reduction
2Object-generated harmful factors
If aperiodic CSI reporting is used during secondary cell activation, then signaling overhead is reduced, but CSI reporting delay increases
Solution Approach 1:
The patent introduces semi-persistent CSI reporting as an intermediary solution between periodic and aperiodic reporting. This mode combines advantages of both approaches by establishing pre-configured reporting resources that activate automatically under specific conditions, reducing the need for continuous aperiodic triggering while maintaining timely updates during critical activation phases
Solution Approach 2:
The patent pre-configures multiple CSI reporting configurations (first, second, and third configurations with different periodicities and resources) before secondary cell activation. The UE receives activation commands that specify which configuration to use, allowing the system to prepare appropriate reporting parameters in advance and switch between them based on activation phase requirements, thereby reducing delay while managing overhead
3Adaptability or versatility
If multiple CSI reporting configurations are maintained for different activation scenarios, then reporting flexibility is improved, but device complexity increases
Solution Approach 1:
The patent segments CSI reporting configurations into distinct types (first configuration with longer periodicity for idle states, second configuration with shorter periodicity for activation phases, third configuration for specific scenarios) and assigns them to different activation phases. This segmentation allows the UE to manage complexity by only activating the relevant configuration subset for each phase rather than maintaining all configurations simultaneously active
Solution Approach 2:
The patent implements dynamic configuration switching where the UE receives activation commands that specify which CSI reporting configuration to use based on the current activation phase. The system transitions between configurations (first, second, third) dynamically, allowing flexible adaptation to different scenarios while managing device complexity through controlled switching rather than simultaneous management of all configurations
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for reducing channel state information (CSI) reporting time for cell activation are provided. One method may include receiving, from a network node, one or more semi-persistent (SP) channel state information (CSI) configurations to be employed during secondary cell (SCell) activation, and receiving an activation command for a secondary cell (SCell) and information on a semi-persistent (SP) channel state information (CSI) configuration to be activated from among the one or more semi-persistent (SP) channel state information (CSI) configurations. The method may also include measuring a CSI-reference signal (RS) using the semi-persistent (SP) channel state information (CSI) configuration indicated with the activation command and transmitting a semi-persistent (SP) channel state information (CSI) report for a subset of secondary cells (SCells) available for activation.