Dual-SIM Call Request Processing via RF State Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual-mode dual-card phones with only one radio frequency transceiving chip often result in call loss when one card is in a communication state, as the second card is rendered in a no service state.
Innovation Solution
A call request processing method that obtains state information about a second communication identification card from a shared database and processes the call request accordingly, ensuring that if one card is in a communication state, the call can be routed through the appropriate network, reducing call loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one radio frequency transceiving chip is used in a dual-mode dual-card phone, then device complexity is reduced and cost is lowered, but call reliability deteriorates because the second card becomes unavailable when the first card is in communication
Solution Approach 1:
The patent implements dynamic state management of radio frequency resources by monitoring the communication state of each SIM card in real-time. When a call is active on one card, the system dynamically switches the shared radio frequency chip to serve the second card, enabling flexible resource allocation that maintains call reliability without requiring duplicate hardware
Solution Approach 2:
The patent introduces a switching mechanism as an intermediary between the single radio frequency chip and multiple SIM cards. This switching system acts as a mediator that routes communication signals to the appropriate card based on current usage states, allowing one physical chip to effectively serve multiple cards sequentially without signal loss or interference
2Device complexity
If a single radio frequency chip is shared between multiple cards, then device cost and complexity are reduced, but service availability deteriorates as the second card enters no service state during first card communication
Solution Approach 1:
The system implements periodic state checking and switching between SIM cards. The radio frequency chip alternates between serving different cards based on their communication needs, creating a time-multiplexed service pattern where each card receives periodic access to the shared resource, thereby maintaining overall service availability across multiple cards
3Reliability
If one card is in communication state, then communication function is fulfilled for that card, but the second card becomes unreachable resulting in call loss
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the communication state of each SIM card. When a call is detected on one card, this state information feeds back to the switching control logic, which then adjusts the radio frequency chip allocation to prevent call request loss on the second card, ensuring that incoming calls are not lost due to the first card's active communication
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Provided are a call request processing method and device. The method includes: obtaining state information of a second communication identification card located in a same terminal with a first communication identification card; processing a call request according to the state information, wherein the call request is used for calling the first communication identification card. According to the solution, the technical problem that because only one radio frequency transceiving chip is set in a dual-mode dual-card phone, if one card is in a communication state, a call to another card is easily lost is solved, thereby reducing call loss.