Dual SIM Subscription State Management for Power Efficiency
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Solution Overview
Problem
Dual SIM terminal devices can only have one subscription active at a time, leading to inefficiencies in power consumption and user experience, especially for data services, as the second subscription is deactivated during extended idle periods.
Innovation Solution
A method for managing activity states in terminal devices that monitors transitions between active states and initiates transitions to lower power consumption states or inactive states after a predetermined period, allowing both subscriptions to be used efficiently without prolonged idle periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one subscription is kept in active state for extended periods, then the subscription remains readily available for communication, but power consumption increases and the second subscription remains inaccessible
Solution Approach 1:
The patent implements dynamic state management for subscriptions, transitioning between active, idle, and detached states based on activity monitoring. The system dynamically adjusts the operational state of subscriptions to balance availability with power consumption, rather than maintaining a static active state.
Solution Approach 2:
The system employs periodic activity monitoring and state transitions, checking subscription activity at defined intervals and transitioning to idle or detached states after predetermined periods of inactivity. This periodic action reduces power consumption while maintaining periodic availability.
2Reliability
If the first subscription remains in CELL_FACH state for minutes, then network connectivity is maintained, but the second subscription cannot be used during this time
Solution Approach 1:
The system performs preliminary monitoring of subscription activity and proactively transitions to idle or detached states before the full inactive period elapses. By anticipating the need for subscription switching, the system prepares in advance, reducing the actual switching delay and improving productivity.
Solution Approach 2:
The system automatically monitors subscription activity and performs state transitions without requiring user intervention. The terminal device itself manages the subscription states, detecting inactivity and autonomously transitioning to appropriate states to enable efficient subscription switching.
3Adaptability or versatility
If two transceiver chains are provided for dual SIM device, then both subscriptions can be active simultaneously, but device cost increases
Solution Approach 1:
The patent segments the operational states of subscriptions into distinct levels (active, idle, detached), allowing the system to manage multiple subscriptions with a single transceiver chain by ensuring only one subscription is in the active state at any given time. This segmentation enables logical separation without physical duplication.
Solution Approach 2:
The system changes the operational parameters of subscriptions by transitioning between different states (active, idle, detached) rather than maintaining all subscriptions in the same active state. This parameter change approach allows efficient resource utilization with a single transceiver chain while maintaining the ability to switch between subscriptions.
Data Source
AI summary
A technique for managing activity states of at least two subscriptions in a terminal device is described. A method implementation of this technique performed in the terminal device comprises the steps of monitoring whether a first subscription is to transit or has transit from a first active state to a second active state while at least one second subscription is in a detached state, wherein the second active state is associated with a lower terminal activity than the first active state, if the result of the monitoring step is affirmative, waiting for a predetermined period of time, upon elapse of the predetermined period of time, if the first subscription is still in the second active state, triggering a transition of the first subscription from the second active state to an inactive state and initiating for the at least one second subscription a transition from a detached state to an inactive state.