Radio Link Management in TN-NTN Dual Connectivity
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Solution Overview
Problem
Conventional radio link management procedures in terrestrial-non-terrestrial network dual connectivity scenarios face challenges due to static timing for radio link monitoring, failure detection, and recovery, leading to prolonged service interruptions and inefficient resource utilization.
Innovation Solution
The method involves dynamically adjusting the timing for performing steps of the radio link management procedures based on conditions such as location and velocity of the user equipment, or instructions received from network entities, allowing for more appropriate timing selection to minimize interruption time and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If static timing is used for radio link monitoring, failure detection, and recovery procedures, then the procedures are simple to implement, but service interruption time is prolonged
Solution Approach 1:
The patent applies dynamics by transitioning from static timing configurations to dynamic timing adjustments. The network entity determines UE conditions (location, velocity, service type) and adjusts timing parameters accordingly. This allows the system to adapt timing to real-time conditions, reducing service interruption time while maintaining manageable complexity through automated decision-making algorithms.
Solution Approach 2:
The patent changes timing parameters based on UE conditions. Different timing configurations are applied depending on whether the UE is stationary or mobile, the type of service being provided, and the radio link quality. This parameter adjustment approach optimizes the balance between detection speed and false alarm reduction without requiring complete procedural redesign.
2Speed
If frequent radio link monitoring is performed, then failure detection speed is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The monitoring frequency is made dynamic rather than fixed. The network entity adjusts the timing and frequency of radio link monitoring based on UE conditions such as velocity, location changes, and service type. For stationary UEs with reliable links, monitoring is reduced to conserve resources. For mobile UEs or those in deteriorating conditions, monitoring frequency increases to maintain fast failure detection.
Solution Approach 2:
The patent applies partial action by adjusting monitoring intensity to match actual needs. Instead of continuous high-frequency monitoring for all UEs, the system applies monitoring at appropriate levels based on risk assessment. This reduces unnecessary resource consumption while maintaining adequate detection capability where needed.
3Reliability
If radio link management procedures are optimized for mobile UEs, then service continuity is improved, but resource wastage increases for stationary UEs
Solution Approach 1:
The patent applies local quality by tailoring timing parameters and monitoring procedures to specific UE conditions rather than using uniform settings. Stationary UEs receive optimized timing with longer intervals between monitoring steps, reducing resource consumption. Mobile UEs receive timing optimized for service continuity with shorter intervals. This localized optimization ensures each UE receives appropriate resource allocation based on its specific needs.
Solution Approach 2:
The system changes timing parameters based on UE mobility state and service type. For stationary UEs with stable radio links, extended timing intervals are applied to reduce signaling overhead and resource wastage. For mobile UEs or those providing critical services, tighter timing parameters maintain service continuity. This conditional parameter adjustment resolves the contradiction between reliability and resource efficiency.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for radio link monitoring, failure detection, and recovery in terrestrial network (TN)-non-terrestrial network (NTN) architectures. A method includes determining one or more conditions of a user equipment (UE) and based on the one or more conditions of the UE, adjusting a timing for performing one or more steps of a radio link monitoring, failure detection, or recovery process for a radio link of one or more cells.