Dual Active Dual Standby RF Architecture for Multi-SIM Connectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual-card cellular phones with a single RF device can only handle one subscriber identity at a time due to shared resources, leading to missed calls when another call is active on a different identity.
Innovation Solution
Implementing a mobile communication device with two RF devices, one for each RAT, and a controller that switches between subscriber identities to enable dual active connectivity with a 5G and 4G network using EN-DC/NE-DC/NGEN-DC, allowing simultaneous communication on different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single RF device is shared by two subscriber identities, then device cost is reduced, but call reliability deteriorates because only one identity can be active at a time
Solution Approach 1:
The patent divides the single RF device into two separate RF devices, allowing each subscriber identity to have its own dedicated RF resource. This segmentation enables simultaneous operation of both identities without interference, resolving the reliability issue while maintaining cost-effectiveness through efficient resource allocation.
Solution Approach 2:
The patent introduces a new dimension of operation by enabling dual active connectivity across different RATs (4G and 5G). By utilizing EN-DC/NE-DC/NGEN-DC architectures, the system transitions from single-RAT to multi-RAT operation, allowing both subscriber identities to be active simultaneously through frequency band coordination and network slice isolation.
2Device complexity
If a single RF device is used for dual-card cellular phone, then device complexity is reduced, but productivity deteriorates because simultaneous communication on multiple identities is impossible
Solution Approach 1:
The patent segments the RF processing functions into two independent RF devices, each handling a specific subscriber identity. This segmentation eliminates resource contention and enables parallel communication operations, significantly improving productivity while keeping device complexity manageable through modular architecture.
Solution Approach 2:
The patent implements dynamic resource allocation and switching mechanisms that allow the system to adaptively manage communication resources. The controller dynamically switches between subscriber identities and coordinates RF device operations based on incoming call events and network conditions, optimizing productivity without requiring excessive hardware complexity.
3Adaptability or versatility
If dual connectivity is implemented for single subscriber identity, then communication capability is enhanced, but adaptability deteriorates when applying to multiple subscriber identities
Solution Approach 1:
The patent creates a universal coordination framework that handles multiple subscriber identities through a unified control mechanism. The controller is designed to manage both 4G and 5G RATs simultaneously and can switch between different EN-DC/NE-DC/NGEN-DC configurations, providing multi-functionality that adapts to various communication scenarios without requiring separate handling logic for each identity.
Solution Approach 2:
The patent introduces an intermediary coordination layer that manages the interaction between multiple RF devices and subscriber identities. This mediator component handles the complexity of dual connectivity coordination, frequency band management, and network slice allocation, shielding the upper layers from implementation details while enabling enhanced communication capabilities across multiple identities.
Data Source
AI summary
A mobile communication device including a first RF device, a second RF device, and a controller is provided. The first and second RF devices perform wireless transmission and reception utilizing a first RAT and a second RAT, respectively. The controller detects, during a communication with a first cell using a first subscriber identity, an incoming event for making a voice call or conducting a data session using a second subscriber identity via the second RF device, and switches the communication associated with the first subscriber identity to a second cell which utilizes the first RAT in a frequency band on which dual connectivity over the first and second RATs is supported, or enables the voice call associated with the second subscriber identity to be made via the first RF device when the communication associated with the first subscriber identity is performed via the second RF device.