Handover Selection Using Signal Strength and Base Station Utilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional broadband mobile communication systems fail to guarantee Quality of Service (QoS) during handovers in multi-cell boundary areas, as they only consider signal strength without accounting for base station utilization, leading to potential deterioration in service quality.
Innovation Solution
A method that considers both the signal strength and utilization level of neighboring base stations by combining these factors to select the optimal base station for handover, using a weighted combination of utilization and signal strength to determine the best target base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If handover is performed based only on signal strength, then handover responsiveness is improved, but QoS guarantee deteriorates
Solution Approach 1:
The patent changes the handover decision parameter from only signal strength to a composite parameter that includes both signal strength and base station utilization. The mobile station calculates a combined value by adding the received signal strength to a utilization indicator (inverted so that lower utilization gives higher value), thereby modifying the decision criterion to account for both responsiveness and QoS reliability.
2Reliability
If base station utilization is considered in handover, then QoS reliability is improved, but handover decision complexity increases
Solution Approach 1:
The base station performs preliminary action by pre-calculating and transmitting the utilization indicator to the mobile station before handover decision is needed. This allows the mobile station to easily combine the pre-provided utilization indicator with real-time signal strength measurements, reducing the computational burden during the actual handover decision moment.
Solution Approach 2:
The patent simplifies the complexity by transforming the utilization metric into a directly additive parameter. Instead of requiring complex multi-dimensional evaluations, the system converts base station utilization into a simple numerical indicator that can be directly added to signal strength, making the combined decision process computationally efficient.
3Speed
If only signal strength is used for handover, then handover speed is improved, but service quality deteriorates
Solution Approach 1:
The patent modifies the handover decision parameter from单一的signal strength to a composite parameter combining signal strength and base station utilization. The mobile station calculates a combined value by adding the received signal strength to a utilization indicator, thereby maintaining fast decision speed while improving service quality through load-aware handover.
Data Source
AI summary
A system and method for performing a handover of a mobile station (MS) by considering Quality of Service (QoS) in a broadband mobile communication system. The method can include the steps of: receiving information about one or more neighbor base stations and reception strengths for the neighbor base stations from a Serving Radio Access System (RAS) currently communicating with the MS; extracting a value of a specific field from the received information about the neighbor base stations; combining the extracted value of the specific field with the reception strengths to thereby obtain combined values, and selecting a maximum value among the combined values; and transmitting a handover (handoff) request message to a base station corresponding to the selected maximum value. The system includes an MS that analyzes information about neighbor stations received in a Mobile Neighbor Base-station Advertisement (MOB_NBR_ADV) message to select a target RAS.