Conditional Beam Handover Using CSI-RS Triggered Cell Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam configurations for conditional handovers in mobile communication networks, particularly in heterogeneous environments with varying coverage areas and device capabilities, leading to suboptimal performance and connectivity issues.
Innovation Solution
Implementing conditional handover configurations that adapt beam management strategies based on device capabilities and network conditions, utilizing advanced protocols and modules to optimize beamforming and resource allocation across multiple technologies and releases, ensuring seamless transitions and improved connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam configurations are optimized for conditional handovers in heterogeneous networks, then network performance and coverage are improved, but device complexity and configuration management difficulty increase
Solution Approach 1:
The patent segments beam configurations into multiple distinct sets, each associated with specific beam types (e.g., SSB beams, CSI-RS beams) and handover conditions. This segmentation allows the network to manage different beam configurations independently, reducing the overall complexity by organizing configurations in a structured manner rather than handling all beams uniformly.
Solution Approach 2:
The patent implements preliminary configuration of beam parameter sets before handover events occur. The network pre-configures multiple beam parameter sets with different parameters (such as reference signal power, pathloss reference, and QCL assumptions) so that when a handover is triggered, the UE can immediately apply the appropriate pre-configured set without complex real-time calculations, thereby reducing configuration management burden during actual handover execution.
2Reliability
If multiple beam parameter sets are configured for different handover conditions, then connectivity reliability is improved, but information processing overhead increases
Solution Approach 1:
The patent applies local quality by configuring specific beam parameter sets with tailored parameters for different handover scenarios and beam types. Each beam parameter set contains only the relevant parameters needed for that specific beam type and handover condition (e.g., SSB-specific parameters for synchronization beams, CSI-RS-specific parameters for channel state information beams). This localized configuration reduces information processing overhead by avoiding the transmission and processing of unnecessary parameters for each beam type.
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting and applying different beam parameter sets based on handover conditions, beam types, and network requirements. The network can adjust parameters such as referenceSignalPower, pathlossReferenceRS, and qcl-Index within different parameter sets to optimize performance for specific scenarios. This parameter-based flexibility allows the system to adapt to varying conditions without requiring complete reconfiguration, thereby managing information processing efficiently.
3Ease of operation
If beam configurations are adapted based on device capabilities, then ease of operation is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously select and apply appropriate beam parameter sets based on their own capabilities and the configured options. The network provides a framework with multiple beam parameter sets, and the UE independently determines which set to use based on its capability (e.g., whether it supports certain beam types or parameter configurations). This self-service approach simplifies handover execution as the UE does not require complex real-time negotiations with the network, reducing signaling overhead while maintaining ease of operation.
Data Source
AI summary
A wireless device receives at least one radio resource control (RRC) configuration message comprising an execution condition for a handover to a cell. The at least one RRC configuration message comprises a plurality of parameters indicating: a channel state information-reference signal (CSI-RS) of the cell; a radio resource; and a preamble index indicating a preamble for a random access to the cell. The execution condition comprises the CSI-RS of the cell becoming better than a first value and the reference signal of a primary cell of the wireless device becoming worse than a second value. The wireless device measures the CSI-RS via the radio resource and determines that the execution condition for the handover is met. Based on the determining, the wireless device sends the preamble for the random access. The wireless device sends an RRC reconfiguration complete message associated with executing the handover to the cell.