Multi-SIM Baseband Arbitration for Reliable Voice Call Access
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Solution Overview
Problem
Multi-SIM/eSIM wireless devices limit baseband resource allocation to one SIM/eSIM at a time, leading to unsynchronized RRC states and missed voice calls due to unsynchronized RRC states between the local and network RRC states.
Innovation Solution
Implement a baseband arbitration module to manage baseband resource allocation, transitioning a SIM/eSIM to an RRC idle state locally while another is active, using a voice call monitor timer to regain resources for voice calls, and initiating device-to-network status updates when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If baseband resources are allocated to only one SIM/eSIM at a time, then device complexity is reduced and resource management is simplified, but voice call performance deteriorates due to unsynchronized RRC states and missed calls
Solution Approach 1:
The baseband arbitration module proactively manages RRC state transitions and initiates status update procedures before voice calls are actually missed. When a SIM/eSIM transitions to RRC idle state, the system preliminarily sets up timers and monitors that will trigger status updates with the network, ensuring RRC state synchronization is maintained in advance rather than reacting after missed calls occur.
Solution Approach 2:
The system implements feedback mechanisms where the baseband arbitration module continuously monitors RRC state transitions and timer expirations. When a SIM/eSIM is in RRC idle state and the voice call monitor timer expires, the system sends feedback signals to initiate device-to-network status update procedures, creating a closed-loop control system that adjusts resource allocation based on real-time state monitoring.
2Adaptability or versatility
If RRC state transitions are performed locally without network synchronization, then baseband resource allocation flexibility is improved, but voice call reliability deteriorates due to unsynchronized local and network RRC states
Solution Approach 1:
The system performs preliminary status update procedures with the network before voice calls are impacted. When a SIM/eSIM transitions to RRC idle state, the baseband arbitration module proactively initiates device-to-network status update procedures (such as tracking area updates or mobility update registration) to synchronize RRC states in advance, rather than waiting for voice call issues to manifest.
Solution Approach 2:
The system establishes feedback loops where the baseband arbitration module monitors RRC state transitions and timer expirations, then sends feedback signals to the network to trigger status synchronization. This ensures that local RRC state changes are communicated to the network, maintaining consistency between local and network states for reliable voice call operation.
3Productivity
If baseband resources are continuously allocated to active data transmission, then data throughput is maintained, but voice call capability is lost due to resource occupation
Solution Approach 1:
The system implements periodic monitoring through voice call monitor timers that continuously track the time a SIM/eSIM has been in RRC idle state. When the timer expires, it triggers periodic status update procedures to ensure voice call capability is restored. This periodic action allows the system to maintain data throughput while periodically checking and restoring voice call capability when needed.
Solution Approach 2:
The baseband arbitration module dynamically adjusts resource allocation based on real-time conditions. When a SIM/eSIM transitions to RRC idle state and voice call capability is needed, the system dynamically initiates status update procedures to regain baseband resource access. This dynamic resource management allows the system to switch between data transmission and voice call handling based on immediate operational requirements.
Data Source
AI summary
The described embodiments relate to wireless communications, including methods and apparatus for optimizing voice call performance of a device that includes multiple subscriber identity modules (SIMs) and/or electronic SIMs (eSIMs) during select scenarios. A multi-SIM/eSIM wireless device can include at least two SIM/eSIM profiles that each provide access to cellular wireless services; however, baseband resources of the multi-SIM/eSIM wireless device can be allocated to only one SIM/eSIM at a time. The multi-SIM/eSIM wireless device limits a time duration that a single SIM/eSIM can be allocated the baseband resources to allow another SIM/eSIM access to the baseband resources to initiate or receive a voice call.