UE Mobility Configuration for Overlapping Conditional Handover
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Solution Overview
Problem
Existing wireless communication protocols face challenges in managing concurrent non-conditional and conditional mobility procedures, leading to increased latency and potential failure in handover and SN addition/change processes due to the lack of clear guidelines for UE behavior when conditions are satisfied.
Innovation Solution
A UE is provided with conditional configuration for procedures like conditional handover or PSCell addition/change, and upon initiating a non-conditional procedure, it determines if the condition for the conditional procedure is satisfied, suspending or completing the non-conditional procedure accordingly, and communicates with the RAN to manage overlapping procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If immediate or non-conditional handover procedures are used, then handover speed is improved, but handover failure probability increases
Solution Approach 1:
The patent applies preliminary action by configuring conditional handover parameters in advance at the UE before actual handover execution. The network pre-configures multiple candidate target cells and their corresponding execution conditions, allowing the UE to immediately execute handover when conditions are met without additional signaling, thus achieving both fast handover and reduced failure probability through pre-prepared options.
Solution Approach 2:
The patent implements dynamics by making handover execution conditional and adaptive. Instead of fixed immediate handover, the system dynamically evaluates whether handover conditions are satisfied at the UE based on pre-configured criteria, enabling flexible decision-making that adapts to real-time radio conditions while maintaining fast execution capability.
2Ease of operation
If messaging between RAN nodes is performed for handover procedures, then handover control is improved, but latency increases
Solution Approach 1:
The patent eliminates handover latency by performing all necessary messaging and configuration between RAN nodes in advance. The conditional handover configuration including candidate target cell information and execution conditions is pre-established before handover execution, allowing the UE to immediately switch cells when conditions are met without waiting for additional signaling messages during the actual handover event.
3Reliability
If conditional procedures are implemented at the UE, then handover reliability is improved, but device complexity increases
Solution Approach 1:
The patent reduces UE processing complexity through preliminary action by having the network pre-configure all handover execution parameters, candidate target cells, and condition criteria before the UE needs to make decisions. This preconfiguration approach simplifies the UE's role to monitoring pre-defined conditions and executing pre-determined actions, rather than performing complex real-time evaluations.
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously evaluate whether pre-configured handover conditions are satisfied and independently execute handover decisions without requiring continuous network control or additional signaling during the execution phase, thereby improving reliability while keeping UE processing simple through self-contained condition checking.
4Productivity
If non-conditional procedures are suspended for conditional procedures, then mobility efficiency is improved, but procedure management complexity increases
Solution Approach 1:
The patent manages procedure complexity through preliminary action by pre-configuring multiple conditional handover options with distinct execution conditions before the UE needs to make decisions. This pre-prepared structure allows the UE to efficiently manage procedure transitions by simply evaluating which pre-configured condition is met, rather than managing complex real-time procedure coordination and suspension/resumption logic.
Data Source
AI summary
A technique for managing mobility configuration in a UE includes obtaining conditional configuration information including (i) a conditional configuration related to a candidate cell in the RAN, and (ii) a condition to be satisfied before the UE applies the configuration (1202). The technique further includes detecting that a non-conditional procedure related to the UE and the RAN has been initiated, when the UE is connected to the RAN via at least one cell (1204); determining, subsequently to the detecting and when the non-conditional procedure has not been completed, that the condition is satisfied (1206); and completing, by the processing hardware, (i) the conditional procedure in accordance with the conditional configuration and (ii) the non-conditional procedure (1208).