Multi-SIM Call Hold Indication via Intermediary Message
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Solution Overview
Problem
Multi-SIM mobile communication devices face challenges in managing supplementary services across different networks, leading to issues like call waiting and hold functionalities not being available between separate networks, resulting in users being unaware of call status changes and parties on held calls receiving only comfort noise without indication.
Innovation Solution
A mobile communications device configured to receive calls on multiple SIMs, suspend one call on local hold, switch to another active call, and transmit a message to the held call, allowing for improved call management and user notification through audio or text messages during call transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a user switches to a second voice call on a different SIM, then the second call can be received and handled, but the first call party receives only comfort noise without any indication that the call has been placed on hold
Solution Approach 1:
The patent introduces an intermediary message transmission mechanism that sends a hold indication message from the mobile device to the first call party's device. This intermediary communication bridges the information gap, informing the first call party that their call has been placed on hold, thereby resolving the information loss problem while maintaining the call switching capability
Solution Approach 2:
The system implements feedback by transmitting a message back to the first call party's device to notify them of the call status change. This feedback loop ensures that the first call party is informed about the hold state, preventing confusion and improving the overall user experience during call switching operations
2Adaptability or versatility
If multiple calls are managed on different SIMs, then users can access multiple communication networks, but supplementary services like call waiting and call hold are not available between separate networks
Solution Approach 1:
The patent applies universality by implementing a generalized message transmission mechanism that works across different network types and SIM cards. The hold indication message system is designed to be network-agnostic, enabling supplementary services like call hold to function reliably across multiple communication networks and different SIM configurations
Solution Approach 2:
The system performs preliminary action by proactively sending the hold indication message immediately when a call is placed on hold, before the other party experiences confusion or disconnects. This advance notification ensures reliable service delivery across multiple networks by preventing call drops and maintaining service quality
3Reliability
If silence descriptor frames are transmitted to maintain a call connection, then the call connection is maintained on local hold, but power consumption increases and no indication is provided to the called party
Solution Approach 1:
The patent extracts the essential notification function from the continuous SID frame transmission. Instead of relying solely on continuous SID frames for both connection maintenance and notification, the system separates these functions by using intermittent message transmission for notification purposes, thereby reducing power consumption while maintaining connection reliability
Solution Approach 2:
The system implements periodic action by transmitting hold indication messages at specific intervals or events rather than continuously. This periodic message transmission maintains call connection reliability while significantly reducing power consumption compared to continuous SID frame transmission, as messages are sent only when necessary to update call status
Data Source
AI summary
A method for controlling a mobile communications device and a mobile communications device including a radio processing circuit and a baseband processing circuit adapted to interact with the radio processing circuit, configured to: receive a first call on a first subscriber identity module of a mobile communications device; receive a second call on a second subscriber identity module of the mobile communications device; suspend the first call on a local hold; switch to the second call from the first call; transmit a message to the first call while the second call is active.