Multimode Device Handover Optimization via CQI and DRC Comparison
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Solution Overview
Problem
Conventional multimode 3G/4G devices rely solely on received signal strength and network loading for handoff between 3G and 4G networks, limiting the optimization of scarce network resources and user experience, especially in areas with equally good 3G and 4G coverage.
Innovation Solution
A system and method that utilizes network loading, user priority, MIMO mode, and Channel Quality Indicator (CQI) to determine handoff between 3G and 4G networks, allowing seamless transitions and optimizing resource utilization by comparing Channel Quality Indicators with data rate indices to select the network offering higher throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multimode devices rely solely on received signal strength and network loading for handoff, then the handoff process is simple, but network resource utilization is not optimized and user experience is limited
Solution Approach 1:
The patent extends handoff decision parameters beyond traditional signal strength and network loading to include user priority, application category, and MIMO mode. This multi-parameter approach transforms the handoff decision from a simple two-factor evaluation to a comprehensive multi-dimensional assessment, optimizing network resource utilization by considering both network conditions and user-specific requirements
Solution Approach 2:
The handoff decision process is segmented into multiple independent evaluation dimensions: signal strength assessment, network loading evaluation, user priority determination, application category classification, and MIMO mode consideration. Each dimension is evaluated separately and integrated to form the final handoff decision, allowing systematic optimization of each parameter independently
2Reliability
If multiple parameters are used for handoff decision, then network resource optimization improves, but the complexity of the handoff process increases
Solution Approach 1:
The patent introduces additional decision parameters (user priority, application category, MIMO mode) that transform the handoff process from signal-strength-based to a multi-parameter optimization process. This enables more reliable handoff decisions by considering network conditions, user requirements, and application characteristics simultaneously
Solution Approach 2:
The system continuously monitors and evaluates multiple parameters including signal strength, network loading, user priority, application category, and MIMO mode availability. This feedback mechanism allows dynamic adjustment of handoff decisions based on current network conditions and user requirements, improving reliability through adaptive optimization
Data Source
AI summary
Systems and methods of operating multimode 3G/4G communications devices in an overlapping 3G/4G coverage area (e.g., WiMAX or LTE/CDMA-EvDO) include determining a loading condition of the 3G and 4G base stations. If the 3G and 4G base stations are lightly loaded, one or more 4G Channel Quality Indicators (CQI) are compared with one or more corresponding 3G Data Rate Control (DRC) indices to determine which of the 3G and 4G networks allows a higher data throughput. The dual mode communications device is handed off to a 4G base station associated with the 4G coverage if the 4G network allows the higher data throughput; otherwise, the dual mode communications device is handed off to a 3G base station. User priorities, application categories, and/or MIMO and diversity modes may be used to determine handoff if the base stations are more than lightly loaded.