Multi-SIM RRC Suspend-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 by suspending downlink transmissions on one subscription and resuming on another based on paging requests and core network responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE with multiple SIMs transitions to connected mode on one wireless network to respond to a paging request, then connectivity and responsiveness are improved, but power consumption and network resource usage on other subscriptions deteriorate
Solution Approach 1:
The patent implements dynamic mode switching between connected and inactive states for different SIM subscriptions. The UE can dynamically transition subscription 1 to inactive mode while maintaining connected mode for subscription 2, and vice versa, allowing adaptive resource allocation based on current communication needs and reducing unnecessary power consumption
Solution Approach 2:
The patent segments the network connection management by subscription, allowing independent control of each SIM's operational state. The RRC suspend and resume procedures enable separate management of connection states for subscription 1 and subscription 2, permitting selective activation/deactivation of network interfaces based on specific communication requirements
2Reliability
If a UE maintains connected mode on both subscriptions simultaneously, then connectivity and responsiveness are improved, but device complexity and resource management difficulty worsen
Solution Approach 1:
The system dynamically adjusts the operational state of each subscription based on incoming paging requests and current communication needs. When a paging request is received on subscription 2, the UE can dynamically switch subscription 1 to inactive mode, simplifying resource management while maintaining necessary connectivity
Solution Approach 2:
The patent extracts the unnecessary connected mode state from one subscription when the other subscription becomes active. By taking out the connected mode requirement for subscription 1 when subscription 2 is responding to a paging request, the system reduces device complexity and eases resource management
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.