Dual SIM Modem Switching via Pre-configured Radio Access Technologies
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Solution Overview
Problem
The existing dual SIM dual standby (DSDS) technology in wireless communications is complex and time-consuming, leading to prolonged service interruptions during SIM card switching, as it requires sequential de-registration and re-registration of modems, affecting user experience.
Innovation Solution
A wireless communications method and apparatus that deactivate and activate wireless communication capabilities between communications modules without changing the correspondence between SIM cards and modems, using TAU or LAU requests to indicate changes in supported radio access technologies, allowing seamless switching between different radio access technologies without de-registration and re-registration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SIM card and modem correspondence is switched during data card switching, then users can continue to use data services with the other SIM card, but the switching process becomes complex and the switching period lasts for a long time
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple radio access technologies (RATs) in each modem. Before switching is needed, each modem is already capable of supporting multiple RATs (e.g., LTE, NR, UMTS, GSM), so when data card switching occurs, the system can immediately activate the appropriate RAT without complex reconfiguration or re-registration processes, thus maintaining service continuity while simplifying the switching procedure
2Adaptability or versatility
If SIM card and modem correspondence is switched during data card switching, then users can continue to use data services with the other SIM card, but the switching period lasts for a long time
Solution Approach 1:
Each modem is pre-configured with multiple radio access technologies (RATs) before switching is needed. This preliminary capability setup allows the system to immediately activate the appropriate RAT when data card switching occurs, eliminating the time-consuming de-registration and re-registration processes that would otherwise be required, thus significantly reducing switching period duration
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that data services continue uninterrupted during the switching process. The system activates the appropriate pre-configured RAT in the target modem while the source modem maintains service, allowing seamless transition without service interruption or prolonged switching periods
3Adaptability or versatility
If multiple radio access technologies are supported by each modem, then seamless switching between technologies is enabled, but device complexity increases
Solution Approach 1:
The patent applies universality by designing each modem to support multiple radio access technologies (LTE, NR, UMTS, GSM) universally. This multi-functionality allows any modem to serve as the data card regardless of which SIM card is active, eliminating the need for complex one-to-one correspondence management between SIM cards and modems, thus enabling seamless RAT switching while actually reducing operational complexity
Data Source
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Figure 2b
Figure 3a
AI summary
A wireless communications apparatus and a wireless communication method are provided. A specific implementation of the wireless communication method includes the following: deactivating a first wireless communication capability of a first communications module, so that the first communications module does not support the first wireless communication capability; activating a first wireless communication capability of a second communications module, so that the second communications module supports the first wireless communication capability; sending a first uplink message, where the first uplink message is used to indicate that a first user identity does not support the first wireless communication capability; and sending a second uplink message, where the second uplink message is used to indicate that a second user identity supports the first wireless communication capability. In embodiments of this application, the wireless communications apparatus can provide a better service during communication by using the second user identity, without changing a correspondence between the user identity and the communications module.