Dynamic VoWiFi Handover Thresholds for Call Reliability
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Solution Overview
Problem
Existing systems for handling WiFi to cellular (W2C) handovers in cellular telephones struggle to adapt to changing network conditions, leading to suboptimal call experiences due to high handover failure rates and inconsistent quality of service (QoS) between WiFi and cellular networks.
Innovation Solution
A flexible solution that determines live conversation performance indicators, such as call drop rates and handover failure rates, to set and transmit W2C handover parameters like RSRP and RSSI thresholds to user equipment (UE) without requiring software updates, enabling adaptive handover decisions based on specific trigger conditions and scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handover parameters are fixed in UE software, then device complexity is reduced, but adaptability to changing network conditions deteriorates
Solution Approach 1:
The patent implements dynamic handover parameters that can be adjusted in real-time based on network conditions. The network side determines handover parameters (such as RSRP thresholds, RSSI thresholds, handover trigger conditions) and dynamically transmits them to the UE, allowing the system to adapt to changing cellular and WiFi network conditions without requiring software updates to the UE.
Solution Approach 2:
The patent changes the handover parameters themselves based on measured network performance. The network side measures performance indicators (call drop rates, handover failure rates, signal quality) and adjusts handover parameters accordingly, transmitting updated parameters to the UE to optimize handover decisions under different network conditions.
2Reliability
If handover is initiated based on fixed thresholds, then decision speed is improved, but call quality deteriorates due to inappropriate handover timing
Solution Approach 1:
The patent implements a feedback mechanism where the network side continuously measures handover performance indicators (handover failure rates, call drop rates, signal quality metrics) and uses this feedback to dynamically adjust handover parameters. This closed-loop control ensures that handover decisions are based on current network conditions, improving call quality while maintaining timely handover execution.
Solution Approach 2:
The patent performs preliminary measurements of network performance indicators before determining handover parameters. The network side measures call drop rates, handover failure rates, and signal quality in advance, then uses these pre-measured values to set appropriate handover thresholds and trigger conditions, ensuring optimal handover timing without delaying the actual handover decision.
3Productivity
If aggressive handover thresholds are used, then cellular network utilization is improved, but handover failure rate increases
Solution Approach 1:
The patent dynamically adjusts handover thresholds based on measured handover failure rates. When handover failure rates are high, the network side modifies the thresholds and trigger conditions to be more conservative, reducing failed handovers. When failure rates are low, thresholds can be made more aggressive to increase cellular utilization, creating an adaptive system that balances both objectives.
Data Source
AI summary
A flexible solution for handling WiFi to cellular (W2C) handover (e.g., for voice over WiFi (VoWiFi) or video calls) includes: determining, for a wireless network, at least one live conversation performance indicator; based on the at least one live conversation performance indicator, determining at least one W2C handover parameter of a set of W2C handover parameters, the set of W2C handover parameters including a first W2C handover parameter indicating a first trigger condition and a second W2C handover parameter indicating a second trigger condition; and transmitting, by the wireless network, to a user equipment (UE), the at least one W2C handover parameter. In some examples, the W2C handover parameters include a reference signal receive power (RSRP) threshold and/or a received signal strength indication (RSSI) threshold. In some examples, live conversation performance indicators may include a cellular call drop rate, a WiFi call drop rate, and a handover failure rate.