Ping-Pong Handover Prevention in Mobile Radio Networks
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Solution Overview
Problem
Existing mobile radio networks, especially those with network elements from different manufacturers, face challenges in preventing ping-pong handover due to varying decision algorithms and the need for manual optimization of handover threshold values, which is costly and inefficient.
Innovation Solution
The method automatically sets optimal hysteresis values for reception field intensity by transmitting historical handover data in system messages, allowing network elements to recognize and prevent ping-pong handover behavior without requiring manual measurement trips or disclosing manufacturer-specific algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual optimization of handover threshold values is performed through measurement trips, then handover parameters can be precisely adjusted, but the process becomes costly and time-consuming
Solution Approach 1:
The network elements perform self-optimization by automatically analyzing their own handover data and measurement reports to adjust handover parameters. The system uses stored historical handover data and real-time measurement reports to autonomously determine optimal hysteresis values and handover thresholds without requiring external manual intervention or measurement trips.
Solution Approach 2:
The system implements continuous feedback loops where measurement reports from mobile stations and handover performance data are collected, analyzed, and used to automatically adjust handover parameters. The network elements monitor handover success rates, ping-pong handover occurrences, and signal quality metrics, then feed this information back into the parameter optimization process to continuously improve handover performance.
2Adaptability or versatility
If manufacturer-specific handover algorithms are used in network elements from different manufacturers, then each manufacturer can optimize for their own equipment, but ping-pong handover increases at boundaries between different manufacturers' equipment
Solution Approach 1:
The patent implements a universal handover optimization framework that works across network elements from different manufacturers. By standardizing the data exchange format for measurement reports and handover data, and using common optimization algorithms that analyze this standardized data, the system achieves manufacturer-agnostic parameter optimization that prevents ping-pong handover at boundaries while preserving the benefits of manufacturer-specific algorithm development.
3Extent of automation
If decentralized control is implemented in LTE systems without central control elements, then network architecture becomes more modern and flexible, but the probability of unwanted ping-pong handover increases
Solution Approach 1:
The patent introduces an intermediary data exchange mechanism between decentralized network elements (eNodeBs) that enables coordinated handover decisions. By sharing measurement reports, handover history, and parameter optimization results through standardized interfaces, the decentralized elements can make locally independent decisions while maintaining overall network consistency, thus preventing ping-pong handover without requiring a central control element.
Data Source
AI summary
A method for preventing ping-pong handover in mobile radio networks having a multiplicity of stationary base stations at a distance from one another, and also stationary and/or moveable mobile radio stations, such as mobile radio telephones, which are in the transmission and reception range of the base stations. Repeated unwanted handover of a mobile radio station in the connected/active mode from a source base station to a destination base station is reduced or prevented. System messages are transmitted between the mobile radio stations and the base station, wherein the system messages for initiating the handover are used to transmit historical information relating to handovers which have already been performed, that information being used to automatically ascertain and set optimum operating parameters for the mobile radio stations and/or at least one of the base stations which are involved. The aim is to develop a method for preventing ping-pong handover in mobile radio networks, specifically in networks with network elements from different manufacturers, such that the parameters, particularly the hysteresis of the reception field strength, of the mobile radio and/or of the base stations are automatically set independently, to prevent ping-pong handover, without the need for expensive measurement trips with “manual” measurements.