Multi-SIM RRC State Synchronization for Low-Latency 5G Standby
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Solution Overview
Problem
In 5G NR networks, dual SIM dual standby (DSDS) user equipment (UE) experiences latency and unnecessary power consumption due to mismatched RRC states between SIMs and the network when a secondary SIM requests the primary SIM to suspend its activities for high-priority communications, leading to inefficient transitions between RRC states.
Innovation Solution
The UE synchronizes RRC states by communicating with the network to manage transitions, using methods such as RRC resume requests with specific cause values, estimated time durations, and coordinated leaving, ensuring both SIM and the network have consistent RRC status awareness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the secondary SIM requests the primary SIM to suspend its activities for high-priority communications, then the high-priority activity can be conducted, but latency and unnecessary power consumption occur due to mismatched RRC states
Solution Approach 1:
The patent applies preliminary action by having the UE notify the network in advance before suspending the first SIM's RRC connection. The UE sends a notification message to the network indicating the intended suspension, allowing the network to prepare for the state change and avoid latency during the transition. This advance notification enables smooth coordination between the UE and network before the actual suspension occurs.
Solution Approach 2:
The patent implements feedback mechanisms where the UE receives feedback from the network about the RRC state management. The network provides feedback information regarding the suspension and resumption of RRC connections, allowing the UE to synchronize its state management with network expectations and reduce latency in state transitions.
2Productivity
If the secondary SIM requests the primary SIM to suspend its activities, then high-priority communications can proceed, but unnecessary power consumption occurs due to inefficient RRC state transitions
Solution Approach 1:
The patent applies preliminary action by notifying the network before suspending the RRC connection, allowing the network to prepare appropriate power management parameters. This advance preparation enables the UE to transition to suspended state more efficiently without unnecessary power consumption during the transition process.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting RRC state parameters based on the suspension and resumption events. The network modifies connection parameters and power management settings according to the suspended state, optimizing power consumption during the high-priority activity period and upon resumption.
3Productivity
If the UE suspends the first SIM's RRC connection for the second SIM's high-priority activity, then the second SIM can conduct communications, but the RRC state synchronization between UE and network becomes complex
Solution Approach 1:
The patent implements feedback mechanisms where the UE receives feedback from the network about the RRC state management. The network provides feedback information regarding the suspension and resumption of RRC connections, allowing the UE to synchronize its state management with network expectations and reduce complexity in state transitions.
Solution Approach 2:
The patent applies preliminary action by having the UE notify the network in advance before suspending the first SIM's RRC connection. This advance notification simplifies the synchronization process by allowing the network to prepare for the state change, reducing the complexity of coordinating multiple SIM states.
Data Source
AI summary
A multi-universal subscriber identity module (MUSIM) user equipment (UE) is configured to stay synchronized with a network. The UE registers to a first network for the first SIM, registering to a second network for the second SIM, prior to the UE conducting a high priority activity related to the second SIM, sends, to the first network via a connection associated with the first SIM, a first message comprising an estimated time duration during which the UE conducts the high priority activity related to the second SIM, receives, from the first network, a second message indicating a time period during which the first network will retain a connection context for the connection associated with the first SIM in an RRC Inactive state and when the UE completes the high priority activity, determines the connection context of the first network for the connection associated with the first SIM.