RRC-NAS Paging Feedback for Multi-SIM Inactive State Prioritization
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Solution Overview
Problem
In multi-SIM user equipment operating in RRC inactive state with one network while communicating with another, the transmission of a busy indicator by the NAS processor can lead to unnecessary processing and potential errors due to the inability to notify the RRC processor, which results in inefficient resource usage and power consumption.
Innovation Solution
A mechanism where the RRC processor in the user equipment receives a transmission-possible notification from the NAS processor, allowing it to determine if the busy indicator can be transmitted, thereby preventing unnecessary processing and errors by ensuring prioritization of communication with the active network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NAS processor transmits a busy indicator to the second network when in RRC inactive state, then communication prioritization is achieved, but unnecessary processing and potential errors occur due to inability to notify the RRC processor
Solution Approach 1:
The patent implements a feedback mechanism where the RRC processor notifies the NAS processor when it receives paging from the second network. This feedback loop ensures the NAS processor has accurate information about the current communication state before transmitting busy indicators, preventing errors caused by outdated or incorrect state assumptions while maintaining communication prioritization reliability.
Solution Approach 2:
The RRC processor acts as an intermediary between the paging reception from the second network and the NAS processor. By having the RRC processor receive and process the paging first, then notify the NAS processor appropriately, the system ensures proper coordination between layers and prevents the NAS processor from making decisions based on incomplete information.
2Reliability
If the NAS processor continuously checks communication state to determine busy indicator transmission, then accurate prioritization is achieved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the RRC processor perform the initial check and receive paging from the second network before the NAS processor needs to make prioritization decisions. This preliminary reception and notification mechanism eliminates the need for continuous state checking by the NAS processor, reducing power consumption while maintaining accurate prioritization through event-driven updates.
Solution Approach 2:
The RRC processor serves itself by autonomously receiving paging from the second network and determining when notification to the NAS processor is appropriate. This self-service approach at the RRC layer reduces the burden on the NAS processor, allowing it to remain in a lower power state while still achieving accurate prioritization when needed.
3Reliability
If the RRC processor receives paging from the second network and initiates RRC resume procedure, then connection is restored, but resource usage increases during transition
Solution Approach 1:
The patent implements dynamic behavior by allowing the RRC processor to transition between different operational states (idle, inactive, connected) based on received paging and prioritization requirements. This dynamic state management enables the system to restore connections when necessary while avoiding unnecessary transitions, optimizing resource usage during state transitions while maintaining connection reliability.
Data Source
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AI summary
A user equipment (100) comprises: a radio resource control (RRC) processor (131) configured to perform processing in an RRC layer; and a non-access stratum (NAS) processor (132) configured to perform processing in a NAS layer which is a layer higher than the RRC layer. In a case where the user equipment (100) is in an RRC inactive state with respect to the second network (200B) during the communication with the first network (200A), the RRC processor (131) is configured to execute processing of receiving paging addressed to the user equipment (100) from the second network (200B), and notifying the NAS processor (132) that the paging has been received in a case where a transmission-possible notification indicating that information indicating that the communication with the first network (200A) is prioritized over the communication with the second network (200B) is transmittable is provided from the NAS processor (132).