RAT Access Control in Multi-SIM User Equipment
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Solution Overview
Problem
User equipment with multiple Subscriber Identity Modules (SIMs) faces challenges in efficiently managing radio access technologies (RATs) in idle and connected modes, particularly in environments with mixed 2G, 3G, and 4G coverage, leading to suboptimal power consumption and data rate performance.
Innovation Solution
The system logic in user equipment controls access to multiple RATs by employing techniques such as scheduling and switching between them based on predetermined conditions, such as power consumption and data rate requirements, using virtual modems to manage RF resources and transition between 2G, 3G, and 4G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user equipment continuously monitors and switches between multiple RATs (2G, 3G, 4G) to optimize performance, then data rate and network performance improve, but power consumption increases
Solution Approach 1:
The system dynamically changes operational parameters by selectively enabling or disabling specific RATs (2G, 3G, 4G) based on current network conditions and performance requirements. This parameter change approach allows the device to optimize between data rate and power consumption by activating only the necessary RATs rather than continuously monitoring all available technologies.
2Adaptability or versatility
If user equipment manages multiple SIM cards with separate RAT connections, then communication versatility and coverage improve, but device complexity increases
Solution Approach 1:
The patent combines the management of multiple SIM cards and their associated RAT connections into a unified system logic that centrally controls and coordinates all RAT activities. This merging approach simplifies the overall system architecture by eliminating the need for separate management mechanisms for each SIM card, thereby reducing device complexity while maintaining communication versatility.
3Reliability
If user equipment maintains idle mode connections on multiple RATs simultaneously, then network availability and call reception improve, but power consumption increases
Solution Approach 1:
The system extracts and maintains idle mode connections selectively on only those RATs that are necessary for specific functions (e.g., maintaining 2G for voice calls while using 4G for data). This extraction approach allows the device to preserve network availability for critical services while avoiding the power consumption overhead of maintaining idle connections on all available RATs simultaneously.
Data Source
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AI summary
User equipment includes techniques that may improve operation by selectively controlling access to particular radio access technologies (RATs) for the user equipment while it is operating in certain modes, such as idle mode. Once the user equipment is in a connected mode, and operating with significant uplink and\or downlink traffic activity, inter-RAT procedures can provide the benefits of access to multiple RATs. This technique is useful in many different environments, such as an environment that is predominantly 2G or 3G with 4G hot spot coverage. This technique may also be useful for providing enhanced operations in 2G/3G capable dual SIM user equipment running in a camped mode or other modes. The technique is not limited to 2G/3G/4G or any other particular standards, but may apply to any standards in a sequence of evolving or incrementally improving standards.