Wireless Handover Bias Factor for Heterogeneous Network Interference
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Solution Overview
Problem
Interference from reference signals at the cell edge of target access nodes in heterogeneous wireless communication networks leads to reduced coverage, poor user experience, and handover failures due to devices connecting to stronger signal sources instead of lower power target nodes.
Innovation Solution
A method to determine a handover condition by calculating a bias factor based on measurement and reporting information from wireless devices, which is applied to preferentially direct them to target access nodes, reducing resource and network overhead and enhancing efficient handover operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices connect to access nodes based on strongest signal strength, then connection reliability is improved, but handover to target access nodes fails and coverage is reduced
Solution Approach 1:
The patent introduces a bias factor that modifies the handover decision parameter. Instead of using raw signal strength comparisons, the system calculates a biased reference signal received power (RSRP) by adding the bias factor to the target access node's signal strength. This parameter change enables devices to preferentially select target access nodes even when source nodes have stronger signals, thereby improving handover success rates while managing interference effects.
2Reliability
If bias factor is applied to prefer wireless devices to target access nodes, then handover success rate is improved, but device complexity increases
Solution Approach 1:
The bias factor acts as an intermediary parameter that simplifies the handover decision process. Rather than implementing complex interference cancellation or signal processing algorithms at the device level, the system introduces a single bias factor parameter that the device applies to target node measurements. This intermediary approach improves handover success rates while minimizing increases in device complexity.
3Productivity
If handover procedure is implemented in heterogeneous network, then network capacity is improved, but interference at target access node increases
Solution Approach 1:
The patent applies local quality by implementing handover procedures selectively for specific devices in specific conditions. The bias factor is applied locally to devices that would otherwise be served by source access nodes, creating a localized quality improvement in the target access node's service area. This approach increases network capacity by utilizing underutilized target nodes while managing interference through selective handover rather than network-wide changes.
Data Source
AI summary
Systems and methods are described for determining a handover condition in a wireless communication network. A plurality of active wireless devices in communication with a first access node may be detected. Measurement and reporting information may be received at the first access node from the wireless devices indicating proximity to a second access node. A criteria for selecting a wireless device in communication with the first access node for handover may be determined. A bias factor for the selected wireless device based on the received measurement and reporting information may be calculated. The bias factor may be provided to the selected wireless device and the first access node and/or a controller node may instruct the selected wireless device to communicate with the second access node.