RF Resource Sharing for Dual SIM Mobile Devices
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Solution Overview
Problem
Dual SIM Dual Standby (DSDS) devices face inconvenience and resource consumption issues when trying to send or receive messages on a second SIM during an ongoing VoLTE call on the first SIM, as the second SIM is suspended, leading to delays and missed communications.
Innovation Solution
A method and system for selectively sharing radio-frequency (RF) resources between multiple SIMs in a mobile device, allowing access to RF resources to be transferred from a first subscription to a second subscription based on specific conditions and network parameters, enabling message communication through the second subscription without disconnecting the first subscription from the ongoing service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF resources are dedicated to one SIM during active communication, then communication reliability is improved, but service versatility deteriorates
Solution Approach 1:
The patent implements dynamic RF resource allocation where the system transitions from static dedicated allocation to dynamic sharing. During active VoLTE call on SIM1, the system dynamically allows SIM2 to access RF resources for SMS operations by evaluating network parameters and temporarily suspending SIM1's RF usage when necessary, thus achieving both reliable communication and service versatility
Solution Approach 2:
The system changes the parameter of RF resource allocation from exclusive to shared mode based on network conditions. By monitoring network parameters such as signal strength and call status, the system adjusts RF resource distribution between SIM1 and SIM2, allowing SMS operations on SIM2 during VoLTE calls when network conditions permit
2Adaptability or versatility
If RF resources are shared between multiple SIMs, then service versatility is improved, but communication reliability deteriorates
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring network parameters and communication status. Before allowing SIM2 to access RF resources during SIM1's active call, the system evaluates current network conditions and provides feedback to determine whether sharing is safe, thus maintaining communication reliability while enabling service versatility
Solution Approach 2:
The system applies partial RF resource sharing rather than full allocation. During VoLTE calls, SIM2 is allowed partial access to RF resources specifically for SMS operations, while SIM1 retains priority access for voice communication, achieving service versatility without compromising overall communication reliability
3Adaptability or versatility
If additional transceivers are added to enable simultaneous communication on multiple SIMs, then service versatility is improved, but device complexity increases
Solution Approach 1:
The patent makes the single transceiver universal by enabling it to serve multiple SIMs for different service types simultaneously. The same transceiver handles VoLTE calls on SIM1 and SMS operations on SIM2 by dynamically switching and sharing RF resources, eliminating the need for separate transceivers and reducing device complexity while maintaining service versatility
Data Source
AI summary
A method performed by a mobile device for selectively allowing radio-frequency (RF) resource sharing between a plurality of subscriptions associated with a plurality of subscriber identity modules (SIMs) in the mobile device, the method includes transferring access to an RF resource from a first subscription among the plurality of subscriptions to a second subscription among the plurality of subscriptions during an ongoing service through the first subscription based on occurrence of a condition, evaluating one or more network parameters pertaining to communication through the first subscription, and causing the first subscription and the second subscription to share access to the RF resource for a first defined time period based on the evaluating such that message communication through the second subscription is enabled without disconnecting the first subscription from the ongoing service.