Multi-SIM Device Simultaneous Voice Calls via Relay Link
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Solution Overview
Problem
Multi-SIM multi-active devices can only maintain one active voice call at a time due to the use of a single speaker and microphone, limiting users to either hold one call or merge them into a conference call.
Innovation Solution
Establishing a direct wireless link between the multi-SIM device and a second mobile communication device allows both SIM calls to be maintained active simultaneously, using a third transceiver to relay the second SIM call while the first SIM call is active, and enabling user input to manage which device handles each call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a DSDA device uses one speaker and one microphone for conducting a voice call, then the device can maintain two separate radio resource chains for simultaneous wireless services, but only one voice call can be active at a time while the other is placed in hold state
Solution Approach 1:
The patent introduces a second mobile communication device as an intermediary to handle the audio I/O for the second SIM call. This mediator device receives the call audio from the MSMA device via Bluetooth and plays it through its own speaker, while capturing audio from its microphone and transmitting it back to the MSMA device. This allows the MSMA device to maintain two active voice calls simultaneously without needing separate audio hardware for each call.
2Ease of operation
If a user wants to talk or listen on two active voice calls at the same time, then both calls need separate audio output and input channels, but the DSDA device only has one speaker and one microphone available
Solution Approach 1:
The patent makes the second mobile communication device serve multiple functions: it acts as an audio output device (speaker) for the second SIM call, an audio input device (microphone) for the second SIM call, and maintains its own independent communication capability. This multi-functional approach eliminates the need for the MSMA device to have separate audio hardware for each call while still enabling simultaneous active voice calls.
3Device complexity
If the device merges two voice calls into a conference call, then both calls can be handled with a single audio channel, but this may be undesirable in most circumstances where separate call handling is needed
Solution Approach 1:
The patent segments the audio handling for each SIM call into separate channels. The first SIM call uses the MSMA device's own speaker and microphone for audio I/O, while the second SIM call uses the second mobile communication device's speaker and microphone for audio I/O. This segmentation allows each call to be handled independently with its own audio path, providing flexibility to users who need separate call handling rather than merged conference call functionality.
Data Source
AI summary
Devices, systems, and methods for handling simultaneous calls on a multi-subscriber identification module (SIM) multi-active (MSMA) device having at least a first SIM associated with a first transceiver and a second SIM associated with a second transceiver. A processor of the MSMA device may establish a first SIM call using the first transceiver and a second SIM call using the second transceiver while the first SIM call is active. The processor may also establish a direct wireless link to a second mobile communication device using a third transceiver. The processor may maintain both the first and second SIM calls active simultaneously by handling the first SIM call using an input/output device of the MSMA device and relaying the second SIM call to the second communication device via the direct wireless link.