PDU Session Graceful Leave Signaling for Dual-SIM MT Delivery
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Solution Overview
Problem
In multi-SIM deployments, UEs face challenges in efficiently leaving one network to connect to another while avoiding wastage of network resources and minimizing service interruptions due to conflicting objectives in handling mobile terminated data delivery during the transition.
Innovation Solution
The UE coordinates with the network during PDU session establishment to indicate how mobile terminated service delivery should be handled during a graceful leave, allowing the network to respond with a status indication, thereby optimizing the leave procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE quickly leaves the first network to connect to the second network, then the leave procedure efficiency is improved, but the UE may not have sufficient knowledge of how MT data delivery will be handled, causing unnecessary returns to the first network
Solution Approach 1:
The patent applies preliminary action by having the UE indicate its graceful leave status and MT data delivery requirements during the PDU session establishment phase, before actually leaving the network. This allows the network to pre-configure handling instructions (such as blocking or forwarding MT data) so that when the UE quickly transitions to the second network, it already has the necessary information about MT data delivery expectations, avoiding unnecessary returns to the first network
2Loss of energy
If the network handles MT data delivery by blocking all data during graceful leave, then network resources are saved, but service interruption increases for the UE
Solution Approach 1:
The patent applies local quality by differentiating the handling of MT data based on specific PDU session characteristics and UE requirements. Instead of uniformly blocking all MT data during graceful leave, the network selectively blocks or forwards data based on the indicated graceful leave status and MT data delivery requirements for each specific PDU session, thereby saving network resources while maintaining necessary service continuity for critical sessions
3Reliability
If the network provides detailed MT data delivery instructions during PDU session establishment, then the UE can make informed leave decisions, but the setup procedure complexity increases
Solution Approach 1:
The patent applies the extraction principle by isolating the graceful leave status indication and MT data delivery requirement information as distinct, dedicated fields within the PDU session establishment request message. This allows the network to provide detailed handling instructions without complicating the overall protocol structure, as the additional information is extracted and placed in specific, well-defined locations within the existing message format
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for improving data delivery in dual subscriber identity module (dual SIM) scenarios where a single radio resource is shared. One example method by a user-equipment (UE) generally includes sending a protocol data unit (PDU) session establishment request message to a network entity of a first radio access network (RAN) and including, in the PDU session establishment request message, an indication of how the UE wants the network entity to handle mobile terminated (MT) service delivery after the UE leaves the first RAN via a graceful leave procedure.