Dual-SIM Signaling Control for Reduced Primary Data Interference
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Solution Overview
Problem
Dual SIM terminal devices face interference in uplink radio frequency resources when a secondary SIM card preempts the resources of a primary SIM card, leading to disruptions in data services, particularly during high-requirement services.
Innovation Solution
A terminal device determines the remaining duration for secondary SIM card signaling and sends preset signaling through small data transmission when the duration is less than a preset threshold, switching to a connected state if necessary, and adjusts transmission based on channel conditions and uplink grant information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secondary SIM card periodically sends preset signaling to the network device, then the secondary SIM card can maintain network connectivity and perform data transmission, but the primary SIM card's data service is interrupted due to radio frequency resource preemption
Solution Approach 1:
The patent dynamically adjusts the signaling transmission mode of the secondary SIM card based on the service status of the primary SIM card. When the primary SIM card is in a high-requirement service state (such as video streaming or online gaming), the system switches the secondary SIM card to small data transmission mode, which uses pre-configured uplink resources and does not preempt radio frequency resources. This dynamic adjustment resolves the contradiction by making the secondary SIM card's transmission behavior adaptive to the primary SIM card's service needs, thereby maintaining primary service quality while ensuring secondary SIM card connectivity.
2Reliability
If the terminal device uses traditional connected state transmission for preset signaling, then the signaling can be transmitted reliably, but the transmission duration increases and causes longer resource occupation
Solution Approach 1:
The patent changes the transmission parameters by switching from connected state transmission to small data transmission mode. In small data transmission, the terminal device uses pre-configured uplink resources with specific parameters (such as pre-configured grant resources) that allow for shorter transmission time. This parameter change enables the secondary SIM card to transmit preset signaling more quickly and efficiently, reducing the occupation of radio frequency resources while maintaining transmission reliability through the use of dedicated pre-configured resources.
3Productivity
If the terminal device frequently switches between connected and inactive states for the secondary SIM card, then resource usage can be optimized, but the switching overhead and complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink resources for the secondary SIM card before actual data transmission is needed. The network device预先 allocates configured grant resources that the terminal device can use immediately when small data transmission is required, without needing to go through the complex state switching process. This preliminary configuration simplifies the state management complexity by allowing the terminal device to remain in an inactive state while having ready-to-use transmission resources, thus optimizing resource utilization without increasing management complexity.
Data Source
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AI summary
This application provides a data transmission method and a terminal device. The terminal device includes a primary subscriber identity module SIM card and a secondary subscriber identity module SIM card. The method includes: When the primary subscriber identity module SIM card detects that a specified event is started, the terminal device obtains remaining duration corresponding to the secondary subscriber identity module SIM card. The terminal device determines first preset duration corresponding to the specified event. When the remaining duration is less than the first preset duration, the terminal device sends preset signaling to a network device through small data transmission. According to this application, it may be determined, based on a currently started event, whether to transmit the preset signaling through small data transmission, so that impact on a data service of the primary subscriber identity module SIM card that is caused by transmission of the preset signaling can be reduced to some extent, thereby ensuring use experience of a user.