Dual SIM Status Update via SIP Commands
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Solution Overview
Problem
Dual SIM Dual Standby (DSDS) devices face issues such as network KPI degradation, poor user experience, and increased network bugs due to confusion about SIM availability and unavailability during ongoing calls, leading to false impressions and unidentified connection failures.
Innovation Solution
A system and method for updating status information of SIMs in user equipment, where the network entity receives or initiates voice calls from one SIM while the other SIM is in a suspended data session, allocating radio resources to transmit SIP PAUSE or RESUME commands to indicate unavailability or availability, ensuring accurate network awareness of SIM status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DSDS device maintains both SIMs in standby mode, then battery life is extended and radiation is reduced, but network KPI degrades and connection reliability worsens
Solution Approach 1:
The patent applies preliminary action by proactively notifying the network about upcoming call scenarios before they occur. The UE sends a first notification message indicating that a first call is about to be established on the first SIM, allowing the network to prepare appropriate resource allocation and avoid connection failures on the second SIM in advance.
Solution Approach 2:
The patent implements feedback mechanisms through multiple notification messages exchanged between UE and network. The network receives status updates about call scenarios and provides responses, creating a closed-loop communication system that enables dynamic resource management and improves connection reliability while maintaining DSDS operation.
2Reliability
If DSDS device suspends second SIM during first call, then connection conflicts are avoided, but network awareness of SIM availability is lost
Solution Approach 1:
The patent uses feedback by continuously notifying the network about SIM status changes. When the first call is established, the UE sends a first notification message. When the second SIM becomes available again, the UE sends a second notification message, ensuring the network always has current information about SIM availability without requiring the SIM to remain actively connected.
Solution Approach 2:
The notification messages act as intermediaries that carry SIM status information between the UE and the network. These messages bridge the information gap created by suspending the second SIM, allowing the network to remain aware of SIM availability states without requiring direct active connections to all SIMs.
3Adaptability or versatility
If DSDS device allows simultaneous calls on both SIMs, then service availability improves, but device complexity and resource requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the communication resources and time slots between the two SIMs. Instead of requiring full simultaneous dual-active capability, the system segments the available radio resources and manages call scenarios through time-division and resource-allocation strategies, reducing overall device complexity while maintaining service availability.
Solution Approach 2:
The patent implements dynamics by making the device operation mode flexible and adaptable. The DSDS device can dynamically switch between different call scenarios (first call only, second call only, or sequential calls) based on network conditions and user needs, rather than being fixed in a single operational mode. This dynamic behavior maintains service availability without requiring permanent dual-active hardware complexity.
Data Source
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AI summary
Embodiments of the present disclosure may relate to a system and method for updating a status information of a first SIM [112A] and a second SIM [112B] of a user equipment [110] at a network entity [140]. In a preferred embodiment, the system [100] comprising: the network entity [140] configured to receive and/or initiate a first voice call from the first SIM [112A]; and the user equipment [110] configured to allocate a radio resource to the second SIM [112B] for transmitting the status information to the network entity [140]; allocate the radio resource to the first SIM [112A] for availing the first voice call; and re‐allocate the radio resource to the second SIM [112B] for transmitting the status information (indicating availability of the second SIM [112B]) to the network entity [140] the user equipment [110] in an event the voice connection on the first SIM [102A] is disconnected.