Radio Terminal CDRX Switching Aligned With Cell DTX/DRX
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in efficiently aligning UE CDRX patterns with cell DTX patterns in response to dynamic activation and deactivation, leading to inefficiencies in network energy saving and UE power consumption.
Innovation Solution
A radio terminal and network node implement a configuration framework that includes a first configuration for normal operations, a second configuration for alignment with cell DTX/DRX, and a third configuration for cell DTX/DRX activation/deactivation, allowing dynamic adjustment of CDRX parameters and resource allocations based on alignment relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If UE CDRX patterns are dynamically adjusted to align with cell DTX/DRX patterns, then network energy saving is improved, but device complexity increases due to multiple configuration management
Solution Approach 1:
The patent implements dynamic switching between first and second CDRX configurations based on cell DTX/DRX activation states. The network device configures multiple CDRX parameter sets (first configuration for normal operation, second configuration for alignment with cell DTX/DRX) and dynamically indicates which configuration the UE should use based on current cell energy saving states, enabling adaptive energy optimization without permanent complexity
Solution Approach 2:
The patent segments CDRX configuration into distinct first and second configurations with different parameter sets. The first configuration is used during normal cell operation, while the second configuration is specifically designed for alignment with cell DTX/DRX patterns. This segmentation allows the UE to switch between predefined configurations rather than continuously adjusting parameters, reducing processing complexity while maintaining energy optimization benefits
2Adaptability or versatility
If multiple CDRX configurations are maintained for different cell states, then adaptability to cell DTX/DRX is improved, but information overhead increases
Solution Approach 1:
The network device performs preliminary configuration by providing both first and second CDRX configurations to the UE in advance through RRC signaling. The actual switching between configurations is then triggered by dynamic indicators (such as DCI messages or MAC CE) that reference pre-configured parameter sets. This approach separates the bulky configuration data (sent less frequently) from the switching control (sent frequently but compactly), reducing overall signaling overhead while maintaining high adaptability
Solution Approach 2:
The patent uses configuration copying where the second CDRX configuration is derived from or related to the first configuration. Instead of completely independent configuration sets, the patent allows the second configuration to copy certain parameters from the first while modifying specific CDRX parameters for alignment with cell DTX/DRX. This reduces the total information that needs to be signaled, as the UE can inherit common parameters from the first configuration
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A radio terminal receives, via one or more RRC messages, a first configuration related to downlink (DL) reception or uplink (UL) transmission, a second configuration related to the DL reception or the UL transmission, provided in addition to the first configuration, and a third configuration related to cell DTX or cell DRX (cell DTX/DRX). The radio terminal uses the first configuration for the DL reception or UL transmission while the cell DTX/DRX based on the third configuration is deactivated, and uses the second configuration for the DL reception or UL transmission while the cell DTX/DRX based on the third configuration is activated. For example, this helps facilitate switching the operation of the radio terminal between normal operation and operation more appropriately aligned with cell DTX/DRX, depending on the dynamic activation and deactivation of the cell DTX/DRX.