Conditional Mobility Selection for Low-Latency Reliable Handover
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Solution Overview
Problem
Existing mobility management techniques in wireless networks, such as LTE and 5G, face challenges in ensuring robust handover procedures due to poor radio conditions and inefficiencies in conditional mobility operations, leading to potential loss of connectivity and increased latency.
Innovation Solution
Implementing a flexible conditional mobility framework that includes configuring user equipment (UE) with threshold-based triggering conditions and selection rules for various mobility procedures, such as conditional handover or resume, to optimize handover processes based on signal strength and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in LTE/5G networks, then basic mobility management is maintained, but handover reliability deteriorates under poor radio conditions and latency increases
Solution Approach 1:
The network node configures the UE with conditional handover parameters and multiple candidate target cells in advance, before the actual handover is needed. The UE stores these configurations and automatically executes handover to a suitable target cell when triggering conditions are met, eliminating the need for real-time network decision-making during poor radio conditions and reducing handover latency while improving reliability
2Reliability
If conditional mobility operations are implemented, then handover reliability improves under poor radio conditions, but device complexity and configuration overhead increase
Solution Approach 1:
The conditional handover configuration is segmented into multiple independent candidate target cells, each with its own triggering conditions and execution parameters. This allows the UE to evaluate and execute handover to the most suitable target based on current radio conditions, reducing the complexity of managing a single complex conditional handover configuration while improving mobility reliability
Solution Approach 2:
The network dynamically adjusts conditional handover parameters such as triggering thresholds, offset values, and candidate cell lists based on UE capability information and current network conditions. This adaptability optimizes the balance between reliability improvement and configuration complexity for different deployment scenarios
Data Source
AI summary
Embodiments include conditional mobility methods performed by a user equipment (UE) in a wireless network. Such methods include receiving, from a network node via a serving cell, a conditional mobility configuration related to a plurality of mobility procedures, of different types, towards one or more candidate target entities. The conditional mobility configuration includes one or more triggering conditions for the plurality of mobility procedures. Such methods include monitoring for the triggering conditions based on measurements of radio signals associated with the candidate target entities and/or the serving cell. Such methods include, based on detecting a particular triggering condition, performing a particular mobility procedure towards a particular candidate target entity, with the particular candidate target entity and/or the particular mobility procedure being selected based on a selection rule. Other embodiments include complementary methods performed by a network node, and UEs and network nodes configured to perform such methods.