Wireless Handover Management via Bit Error Rate and Load Assessment
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Solution Overview
Problem
In 5G wireless communication systems, handovers from a next-generation Node-B (gNB) to a 4G eNB based on signal power levels alone can lead to insufficient resource blocks, affecting overall throughput due to resource shortages, making existing handover methods unsuitable for managing handovers effectively in 4G/5G networks.
Innovation Solution
A method for managing handovers that involves the serving base station receiving measurement reports from user equipment, determining modulation and coding schemes, assessing bit error rates, and evaluating handover conditions based on signal power and load capacity, including a formula to determine handover thresholds and timing to prevent ping-pong handovers and ensure resource allocation before performing a handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If handover is triggered based on signal power levels only, then handover decision simplicity is improved, but resource block sufficiency deteriorates
Solution Approach 1:
The patent changes the handover decision parameters from only signal power level to a composite evaluation including signal quality (RSRP, RSRQ) and network load conditions. This allows the system to consider multiple factors before triggering handover, ensuring that target cells have sufficient resource blocks while maintaining manageable decision complexity through standardized measurement procedures.
2Speed
If handover is triggered based on signal power levels only, then response speed is improved, but overall throughput deteriorates
Solution Approach 1:
The patent implements preliminary resource block assessment at the target cell before handover execution. The serving base station evaluates whether the target cell has sufficient resource blocks and appropriate modulation and coding schemes ready in advance. This preliminary preparation ensures that handover can be executed quickly without causing throughput degradation due to resource shortages at the target cell.
3Reliability
If frequent handovers are performed, then connection reliability is improved, but network stability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the serving base station continuously monitors handover performance and network conditions. When ping-pong handovers are detected (frequent back-and-forth handovers between cells), the system adjusts handover thresholds and timing parameters to prevent unnecessary handovers. This feedback control maintains connection reliability while preventing network instability caused by excessive handover activity.
Data Source
AI summary
A method for controlling and managing handovers between base stations in adjoining cells in wireless communications enables a user equipment (UE) to report a bit error rate (BER) to a base station having current conduct of communication with the UE. If the BER is greater than a predetermined value, the base station having conduct further determines whether the UE satisfies a handover condition over a period of time and hands conduct over to another base station if the UE satisfies the handover condition for the period of time and if the other base station is not already operating at capacity. An apparatus for controlling and managing handovers is also disclosed.