Coordinated Leaving for Concurrent RRC Procedures in Multi-SIM UEs
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Solution Overview
Problem
Current wireless communication systems lack a procedure for coordinated leaving of multiple universal subscriber identity modules (USIMs) on a single user equipment (UE), leading to potential errors and resource wastage due to the absence of notification for radio resource control (RRC) connection release, especially during concurrent network connections.
Innovation Solution
Implementing coordinated leaving procedures at the non-access stratum (NAS) or access stratum (AS) layer, where the baseband processor can abort or complete RRC reconfiguration and trigger coordinated leaving, allowing seamless transition between SIMs and networks, using various signaling methods such as UAI messages and RRC reconfiguration complete messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a MUSIM device concurrently connects to multiple networks with multiple SIMs, then the device can handle high-priority activities on different SIMs, but the absence of coordinated leaving procedures causes errors and resource wastage
Solution Approach 1:
The patent applies preliminary action by implementing coordinated leaving procedures that are triggered before actual connection release. When a high-priority activity is detected on one SIM, the system proactively initiates the coordinated leaving process for other SIMs, ensuring proper notification to networks before resource reallocation. This prevents errors and resource wastage by preparing the system state in advance.
Solution Approach 2:
The patent implements feedback mechanisms through assistance information messages that provide network feedback about the MUSIM device's connection state. The system continuously monitors connection status across multiple SIMs and provides feedback to networks about coordinated leaving events, enabling networks to properly manage resources based on actual device state rather than assuming connections are active.
2Speed
If the baseband processor aborts RRC reconfiguration to handle high-priority SIM activities, then connection establishment speed improves, but network statistics may be distorted without proper notification
Solution Approach 1:
The patent applies preliminary action by sending assistance information messages to networks before aborting RRC reconfiguration. This allows the system to prepare networks for the upcoming connection change, ensuring statistics are not distorted. The baseband processor initiates the notification process in advance of the actual connection abort, maintaining information integrity while enabling fast switching.
Solution Approach 2:
The patent uses assistance information messages as an intermediary communication mechanism between the baseband processor and networks. This intermediary carries coordinated leaving information that bridges the gap between the fast internal decision to abort reconfiguration and the external network's need for accurate statistics. The message acts as a mediator that preserves information flow despite the abrupt connection change.
3Productivity
If the device transitions between SIMs and networks frequently, then high-priority activities are handled efficiently, but delay may occur in establishing new connections without coordinated procedures
Solution Approach 1:
The patent applies preliminary action by pre-notifying networks of coordinated leaving through assistance information messages before actual connection transitions. This allows networks to prepare for incoming connections, reducing establishment delay. The system performs the notification action in advance of the physical connection change, smoothing the transition process.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the coordinated leaving procedure seamlessly connects one connection state to another. The assistance information messages and procedural mechanisms ensure uninterrupted information flow and resource management throughout the SIM transition process, eliminating gaps that would cause delays while maintaining efficient activity handling.
Data Source
AI summary
Coordinated leaving for a UE having a first SIM and a second SIM may include decoding, at a baseband processor, an RRC reconfiguration message associated with the first SIM received from a first network. A communication corresponding to the second SIM received from a second network is decoded while the baseband processor is processing the received RRC reconfiguration message. The communication received from the second network is determined to comprise a higher priority than the RRC reconfiguration procedure. Based on determining, a UAI message corresponding to the first SIM is encoded by the baseband processor for transmission to the first network. The UAI message is configured to inform the first network of coordinated leaving and abortion of the RRC reconfiguration procedure. The first SIM is transitioned to an idle mode. An RRC request corresponding to the second SIM is encoded by the baseband processor for transmission to the second network.