Conditional Handover Execution in 5G Standalone O-RAN Networks
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Solution Overview
Problem
Existing conditional handover technologies in wireless communication systems face challenges in efficiently evaluating and executing handovers based on dynamic signal conditions, leading to potential communication disruptions and reduced reliability.
Innovation Solution
The proposed solution involves a wireless device that continuously evaluates execution conditions for conditional handovers by measuring signal strengths and qualities from multiple cells, and initiates a handover when predetermined thresholds for RSRP and SINR are met, ensuring seamless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover evaluation is performed continuously based on dynamic signal conditions, then handover reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring handover execution conditions (such as RSRP thresholds, SINR thresholds, and time-to-trigger parameters) before the actual handover decision is needed. The UE continuously monitors signal conditions against these pre-set criteria, allowing rapid handover execution without complex real-time calculations. This pre-preparation of evaluation criteria reduces the computational burden during dynamic handover decisions while maintaining high reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously measures and reports signal conditions (RSRP, SINR) to the network, and adjusts handover decisions based on real-time feedback about signal quality changes. The time-to-trigger parameter acts as a feedback loop that prevents premature handovers by requiring sustained signal degradation before executing a handover, thus improving reliability while managing complexity through structured feedback protocols.
2Reliability
If handover execution conditions are strictly enforced with multiple thresholds, then communication reliability is improved, but handover response time increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing multiple threshold criteria (RSRP threshold, SINR threshold, time-to-trigger) before handover events occur. When signal conditions deteriorate, the UE can quickly compare current measurements against these pre-set criteria rather than performing complex real-time optimization, enabling fast handover execution that maintains reliability through structured decision logic.
Solution Approach 2:
The patent implements dynamics by allowing the time-to-trigger parameter to dynamically adjust the handover response characteristics. This parameter acts as a hysteresis mechanism that prevents premature or oscillating handovers by requiring signal conditions to persist below thresholds for a configured duration. This dynamic adjustment balances reliability (avoiding unnecessary handovers) with response time (enabling timely handovers when truly needed).
Data Source
AI summary
A wireless device includes a transceiver, sensing circuitry, and an electronic processor. The transceiver receives electromagnetic wave signals emitted wirelessly from a plurality of cells. The sensing circuitry measures a signal from a source cell to obtain a signal to interference and noise ratio (SINR) and a received signal reference power (RSRP) for the signal. When the transceiver receives a reconfiguration message from the source cell during a time span, the electronic processor controls a legacy handover that shifts communication with the transceiver from the source cell to the target cell. When a conditional handover state exists, the electronic processor controls a conditional handover that shifts communication with the transceiver from the source cell to the target cell. The conditional handover state includes an absence of the legacy handover, the RSRP being below an RSRP threshold and the SINR below an SINR threshold.