Multiple-Event Conditional Handover Logging for Wireless Networks
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Solution Overview
Problem
Existing communication systems face challenges in ensuring reliable and efficient handovers, particularly in 5G networks where higher frequencies lead to rapid signal degradation due to obstacles, resulting in radio link failures and handover failures.
Innovation Solution
The implementation of multiple-event conditional handover (CHO) technology, which allows for the preparation of multiple target cells by the serving cell before handover execution, based on joint evaluation of multiple events such as signal strength and quality measurements, to ensure optimal handover conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-event handover conditions are used, then handover execution is simpler and faster, but handover reliability deteriorates due to insufficient evaluation of multiple conditions
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple handover conditions (events) and their associated parameters before actual handover execution is needed. The network node prepares a set of conditions including measurement events, time-to-trigger values, and hysteresis parameters in advance, so that when handover is required, the user equipment can directly evaluate pre-prepared conditions rather than assessing multiple factors in real-time, thereby improving reliability without significantly increasing operational complexity
Solution Approach 2:
The patent segments the handover decision process into multiple independent conditions or events (such as A3 event for neighbor cell becoming offset better than serving cell, A5 event for serving cell becoming worse than thresholds). Each condition can be evaluated separately and independently, allowing the system to manage complexity by dividing the overall handover evaluation into manageable segments while maintaining comprehensive assessment of multiple factors
2Measurement precision
If multiple-event conditional handover is implemented, then handover timing precision is improved, but handover execution time increases due to joint evaluation of multiple events
Solution Approach 1:
The patent applies preliminary action by pre-establishing the temporal relationship and evaluation sequence of multiple events before handover execution is needed. The network node configures which events should be evaluated simultaneously or sequentially, and pre-sets time-to-trigger values and hysteresis parameters. This allows the user equipment to follow a predetermined evaluation framework during actual handover, achieving precise timing decisions without the time penalty of real-time complex analysis
Solution Approach 2:
The patent applies partial action by requiring that not all possible handover conditions must be satisfied simultaneously, but rather that a configured set of relevant events must be evaluated according to specific rules. The system can be configured to require joint fulfillment of specific event combinations (e.g., A3 event with TTT expiration and A5 event with leaving condition) rather than evaluating every possible measurement condition, thereby achieving sufficient precision without excessive time consumption
3Reliability
If conditional handover preparation is performed in advance, then mobility robustness is improved, but network complexity increases due to multiple target cell preparation and management
Solution Approach 1:
The patent applies preliminary action by having the network node prepare and configure multiple candidate target cells and their associated handover conditions in advance before actual handover is needed. The serving cell configures measurement events, target cell lists, and execution conditions beforehand, so that when mobility requirements arise, the system can quickly evaluate pre-prepared options rather than performing complex real-time analysis, thereby improving mobility robustness without proportionally increasing network management complexity
Solution Approach 2:
The patent introduces an intermediary mechanism where the network node acts as a mediator that centralizes the management and configuration of multiple target cells and handover conditions. Rather than requiring each user equipment to independently manage complex multi-target cell preparations, the network node serves as an intermediary that handles the complexity of preparing and coordinating multiple handover options, while user equipment only needs to evaluate the configured conditions during actual handover execution
Data Source
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AI summary
According to an example embodiment, a method may include logging, by a user device in a wireless network, information related to a multiple-event conditional handover execution, wherein the multiple-event conditional handover execution is based on a joint evaluation of multiple events by the user device; and sending, by the user device, a report including at least a portion of the information.