Inter-RAT Handover Reporting for Mobility Robustness Optimization
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Solution Overview
Problem
Details regarding mobility robustness optimization (MRO) enhancements for inter-radio access technology (RAT) handover procedures have not been discussed in 3GPP 5G networks, particularly in handling radio link failures and handover failures, and there is no mechanism for storing or reporting information associated with successful inter-RAT HO procedures, especially for the case that multiple triggering conditions are met.
Innovation Solution
The solution involves configuring user equipment (UE) with a processor to receive a configuration regarding first information associated with a successful completion of inter-radio access technology (RAT) handover (HO) procedure, including trigger conditions for storing and generating reports, and network nodes to transmit configurations for UE information storage and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE stores and reports detailed inter-RAT HO information for multiple trigger conditions, then mobility robustness optimization is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments the inter-RAT handover information reporting by defining multiple specific trigger conditions (T310 expiry, T312 expiry, T304 expiry, handover success). Each trigger condition represents a distinct segmentation of handover failure scenarios, allowing the UE to store and report information selectively based on which specific trigger occurs, rather than handling all scenarios uniformly.
Solution Approach 2:
The patent changes the parameter of reporting behavior by introducing configurable thresholds and timer values. The network can adjust the trigger conditions (e.g., timer durations, signal quality thresholds) to control when and what information the UE reports, thereby optimizing the balance between mobility robustness and device complexity based on network conditions.
2Reliability
If the UE monitors multiple trigger conditions for inter-RAT HO, then handover success rate is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring of trigger conditions through timer-based mechanisms (T310, T312, T304). Instead of continuous monitoring, the UE checks conditions at periodic intervals defined by these timers, reducing power consumption while still detecting handover failures及时. The timers create discrete monitoring points rather than continuous observation.
Solution Approach 2:
The UE autonomously monitors its own handover status and determines when trigger conditions are met without requiring continuous network commands. The UE self-manages the monitoring of signal quality, timer expiration, and handover completion events, reducing the need for active network control and thereby reducing overall system power consumption.
3Manufacturing precision
If the network configures detailed trigger conditions for HO reporting, then handover optimization precision is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential handover failure information related to specific trigger conditions (T310 expiry, T312 expiry, T304 expiry, handover success) for reporting. Instead of transmitting all possible handover parameters, the network configures the UE to extract and report only the relevant trigger condition information, reducing signaling overhead while maintaining optimization precision.
Solution Approach 2:
The patent applies partial action by configuring the UE to monitor and report only on specific trigger conditions that are most critical for handover optimization. The network can select which trigger conditions to monitor based on operational needs, performing partial monitoring rather than exhaustive monitoring of all possible handover parameters, thus reducing signaling overhead.
Data Source
AI summary
Embodiments of the subject application relate to methods and apparatuses of enhancements for an inter-radio access technology (RAT) handover (HO) procedure. According to an embodiment of the subject application, a user equipment (UE) includes a processor and a transceiver coupled to the processor; and the processor is configured to: receive a configuration regarding information associated with a successful completion of an inter-RAT HO procedure, wherein the configuration is related to at least one trigger condition for the UE storing the information; and generate at least one report including the information in response to fulfillment of the at least one trigger condition.