Conditional Cell Handover Using L1/L2 Mobility Triggers
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Solution Overview
Problem
Existing conditional mobility procedures in telecommunications, particularly L3-based handovers, result in high latency and inefficiencies in intra-DU and inter-DU mobility processes.
Innovation Solution
Implementing L1/L2-based conditional mobility by pre-configuring UEs with candidate cells and trigger configurations, allowing direct handovers to target cells when specific conditions are met, reducing latency and enhancing mobility efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If L3-based conditional handover procedure is used, then handover reliability is improved, but handover latency increases and mobility efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple candidate cell configurations and their corresponding trigger conditions before handover is needed. The UE continuously monitors these pre-configured cells and their reference signals, so when a trigger condition is met, the handover can be executed immediately without waiting for network configuration, thus reducing handover latency while maintaining reliability through pre-validated candidate cells
Solution Approach 2:
The patent substitutes the traditional L3-based handover mechanism with an L1/L2-based mechanism. Instead of using L3 RRC signaling for handover execution, the UE autonomously executes handover based on L1/L2 measurements and pre-configured parameters. This substitution of the control layer mechanism dramatically reduces handover latency while the network maintains control through pre-configuration and validation, thus resolving the contradiction between reliability and latency
2Productivity
If L1/L2-based conditional mobility is implemented, then handover latency is reduced and mobility efficiency is improved, but device complexity increases
Solution Approach 1:
The network performs preliminary action by pre-configuring the UE with candidate cell parameters, reference signal configurations, and trigger conditions before mobility is needed. This shifts the complexity burden to the network side during setup, while the UE only needs to perform straightforward measurements and comparisons against pre-defined thresholds during actual mobility, thus improving mobility efficiency without excessively increasing UE processing complexity
Solution Approach 2:
The patent changes the operational parameters of the mobility system by moving from L3 RRC-based handover to L1/L2-based autonomous handover. The UE uses pre-configured parameters such as reference signal power thresholds, pathloss compensation factors, and trigger condition parameters to make handover decisions. This parameter-based approach simplifies real-time UE processing while maintaining network control, thus improving mobility efficiency without excessive complexity increase
Data Source
AI summary
Embodiments of the present disclosure relate to mobility. According to embodiments of the present disclosure, a UE comprises a transceiver configured to communicate with a network; and a processor communicatively coupled to the transceiver and configured to perform operations. The operations comprise receiving, using the transceiver, from a CU of a base station, a set of configurations of a set of candidate cells for at least one of intra-DU mobility or inter-DU mobility and a set of L1/L2-based conditional trigger configurations associated with the set of candidate cells; and in accordance with a determination that a L1/L2-based conditional trigger configuration among the set of L1/L2-based conditional trigger configurations is satisfied, performing a L1/L2-based handover to a target cell, among the set of candidate cells, associated with the L1/L2-based conditional trigger configuration based on a configuration of the target cell among the set of configurations. In this way, mobility latency may be reduced.