Multi-SIM RRC Suspend and Resume for Paging-Driven Network Switching
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing multiple subscriptions on user equipment (UE) with multiple subscriber identity modules (SIMs), particularly in transitioning between networks to optimize resource usage and reduce power consumption.
Innovation Solution
Implementing a radio resource control (RRC) layer based suspend and resume procedure for UE with multiple SIMs, allowing seamless transitions between wireless networks based on paging requests and core network node responses to suspend or resume downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE with multiple SIMs transitions to connected mode on one network, then communication capability on that network is improved, but network resource usage and power consumption increase
Solution Approach 1:
The patent implements dynamic mode switching between connected and inactive states based on network conditions and communication requirements. The UE can transition between RRC connected mode (for active communication) and RRC inactive mode (for power saving) on different SIMs independently, allowing the system to adapt its resource usage dynamically rather than maintaining a fixed connected state.
Solution Approach 2:
The patent segments the communication management by SIM, allowing each SIM to operate in different RRC modes independently. This segmentation enables the UE to maintain connected mode on one SIM for active communication while simultaneously operating another SIM in inactive mode for power saving, thus resolving the contradiction between communication capability and power consumption at the system level.
2Reliability
If a UE maintains connected mode on all SIMs simultaneously, then communication availability is improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent applies segmentation by allowing independent RRC state management for each SIM. The UE can have SIM 1 in RRC connected mode while SIM 2 is in RRC inactive mode, simplifying the overall resource management compared to maintaining all SIMs in connected mode. This independent state control reduces the complexity of coordinating multiple connected sessions while maintaining communication availability through selective connectivity.
Solution Approach 2:
The patent implements self-service mechanisms where the UE autonomously determines the appropriate RRC mode for each SIM based on incoming paging messages and communication requirements. The device can automatically transition between modes without complex external coordination, reducing management complexity while maintaining communication availability through intelligent autonomous decision-making.
3Productivity
If a UE frequently switches between networks for multi-SIM operation, then network optimization and power efficiency are improved, but transition time and service interruption increase
Solution Approach 1:
The patent implements preliminary action by establishing RRC inactive mode as a pre-configured intermediate state that allows faster transitions compared to full connected mode establishment. The UE can quickly switch to inactive mode on one SIM while maintaining connectivity on another, reducing transition time and service interruption while still achieving network optimization and power efficiency benefits.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit, to a first radio access network (RAN) node associated with a first subscription, a request to suspend downlink transmissions related to the first subscription based at least in part on a paging request received from a second RAN node associated with a second subscription. The UE may receive, from the first RAN node, a release message indicating that one or more core network nodes associated with the first subscription have suspended the downlink transmissions related to the first subscription. Accordingly, the UE may enter an inactive mode on a first wireless network associated with the first subscription and enter a connected mode on a second wireless network associated with the second subscription based at least in part on the release message. Numerous other aspects are provided.