DSDS Wi-Fi Calling Handover via Radio Manager
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Solution Overview
Problem
Current wireless communication systems, particularly in dual-SIM/dual-standby user equipment devices, face challenges in seamlessly transitioning VoWiFi calls to VoLTE or cellular data when Wi-Fi connectivity degrades, leading to potential call drops and handover failures due to lack of MOBIKE support and resource competition.
Innovation Solution
Implementing a wireless radio manager module that determines the best network protocol for each SIM based on Wi-Fi availability, recommending VoWiFi or VoLTE and managing handovers between Wi-Fi and cellular data connections to ensure continuous call functionality, even when Wi-Fi degrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a DSDS UE registers both SIMs for VoWiFi simultaneously, then VoWiFi service availability is improved, but resource competition and handover failures occur when Wi-Fi degrades
Solution Approach 1:
The patent segments the handling of VoWiFi connections by SIM card. Instead of treating both SIMs equally, it designates one SIM as primary for VoWiFi and the other as secondary, allowing independent management of each SIM's connection state and handover behavior. This segmentation prevents resource conflicts while maintaining VoWiFi availability for both SIMs.
Solution Approach 2:
The patent implements preliminary actions by pre-registering the secondary SIM for VoWiFi before actual use is needed. When the primary SIM is in use, the secondary SIM's VoWiFi connection is prepared in advance but not activated, ensuring readiness while avoiding resource conflicts. This preliminary registration enables faster handover when needed.
2Adaptability or versatility
If Wi-Fi calling is used for both SIMs, then voice service coverage is improved, but call drops occur when Wi-Fi connectivity degrades due to lack of MOBIKE support
Solution Approach 1:
The patent introduces an intermediary mechanism (the patentee device acting as a proxy) that mediates between the secondary SIM and the IMS network for VoWiFi connections. This intermediary manages the secondary SIM's PDP context activation and handover procedures, enabling MOBIKE-like functionality without direct MOBIKE support from the network, thus preventing call drops during Wi-Fi degradation.
Solution Approach 2:
The patent implements dynamic connection management where the VoWiFi state of the secondary SIM can change based on the primary SIM's usage. When the primary SIM is active on VoWiFi, the secondary SIM's VoWiFi connection is dynamically adjusted or deactivated. This dynamic behavior allows the system to adapt to changing network conditions and prevent call drops.
3Adaptability or versatility
If simultaneous VoWiFi calls are supported on both SIMs, then service versatility is improved, but resource competition leads to handover failures
Solution Approach 1:
The patent segments resource management by creating separate management paths for primary and secondary SIMs. The primary SIM's resources are managed with full priority, while the secondary SIM's resources are managed independently with lower priority. This segmentation simplifies resource management complexity by avoiding the need for complex arbitration mechanisms while still supporting simultaneous VoWiFi calls.
Data Source
AI summary
Apparatuses, systems, and methods for enhancement of Wi-Fi calling for DSDS user equipment devices (UEs). The UE may register a first connection supported by a first SIM with IMS for VoWiFi based on a determination to prefer VoWiFi for the first SIM. The first SIM may be associated with a first subscription to a first RAN. The UE may include a second SIM that may be associated with a second subscription to a second RAN. The UE may register a second connection associated with the second SIM with the IMS for VoWiFi and/or VoLTE and initiate/receive, via the first connection supported by the first SIM, a VoWiFi call. A recommendation to handover the VoWiFi call from Wi-Fi to cellular data may be received and, based, at least in part, on the recommendation, the UE may register a second connection associated with the second SIM for IWLAN over cellular data.