Aerial UE Handover Ping-Pong Mitigation via Delay Values
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Solution Overview
Problem
Aerial user equipment (UE) experiences frequent ping-pong handover events due to unnecessary measurement reporting in cell edge regions of terrestrial communication networks, leading to increased signaling overhead, battery drainage, and radio link failures, which existing LTE handover mechanisms are not optimized to handle effectively.
Innovation Solution
Implementing a system that detects aerial UEs engaged in ping-pong handover events and sends delay values to these UEs to refrain from gathering measurement data, using GPS to adjust their position and apply delay values to their s-Measure values, thereby reducing unnecessary handovers and mitigating ping-pong handover occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aerial user equipment continuously sends measurement reports in cell edge regions, then handover decisions can be made, but ping-pong handover events increase and signaling overhead increases
Solution Approach 1:
The patent implements a timer-based mechanism where measurement reports are only sent after a predetermined time period has elapsed since the last report. This periodic action filters out excessive reporting during ping-pong handover events, reducing battery drainage while maintaining adequate handover decision information.
Solution Approach 2:
The system dynamically adjusts the measurement reporting parameters based on detection of ping-pong handover events. When ping-pong is detected, the reporting threshold or time period is modified to reduce reporting frequency, thereby conserving battery energy while preventing excessive handovers.
2Speed
If aerial user equipment sends frequent measurement reports, then network can respond to signal changes, but signaling overhead increases
Solution Approach 1:
By implementing time-period-based filtering of measurement reports, the system reduces the frequency of signaling messages sent to the network. This periodic action maintains essential handover response capability while significantly reducing unnecessary signaling overhead during ping-pong events.
Solution Approach 2:
The patent extracts and removes excessive measurement reports that would contribute to signaling overhead. By filtering out reports that occur within the predetermined time period, the system keeps only the necessary signaling traffic while eliminating redundant messages.
3Reliability
If aerial user equipment operates in cell edge regions with good line of sight, then signal strength is improved, but ping-pong handover events occur more frequently
Solution Approach 1:
The system takes preliminary action by detecting ping-pong handover patterns and applying countermeasures before the instability worsens. The predetermined time period filter proactively prevents excessive handover events by blocking measurement reports that would trigger unnecessary handovers, thus maintaining handover stability.
Solution Approach 2:
The patent changes the handover decision parameters dynamically based on detected patterns. When ping-pong events are detected, the system adjusts reporting thresholds or time periods to stabilize handover behavior, preventing frequent switching between cells while maintaining connection quality.
Data Source
AI summary
An architecture to avoid handover ping-pong for aerial user equipment (UE) operational in terrestrial fourth generation (4G) and/or fifth generation (5G) long term evolution (LTE) networks. A method can comprise receiving a request to connect to the network equipment from aerial user equipment; based on the request to connect, retrieving subscription data; based on the subscription data, determining that the aerial user equipment is aerial equipment; determining that the aerial user equipment is engaged in a ping-pong handover event with terrestrial based network equipment situated within a defined geographic area; and transmitting instructions to the aerial user equipment to confirm the ping-pong handover event, wherein the instruction comprises a delay value representing a back off time value for the aerial user equipment to refrain from gathering measurement data within the defined geographic area.