Multi-Access PDU Session Handover Across Micro and Macro Networks
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Solution Overview
Problem
Wireless devices with multiple SIMs experience service interruptions and increased latency when a PDU session via a micro coverage network loses coverage, requiring re-establishment through a macro network, which is inefficient and disruptive.
Innovation Solution
Implementing an enhanced multi-access PDU session that allows simultaneous establishment and management across multiple networks, including 3GPP and non-3GPP access, with an anchor network managing traffic steering, splitting, and switching, and utilizing dual SIMs for seamless handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a PDU session is established via a micro coverage network, then network coverage efficiency is improved, but service continuity deteriorates when the device moves out of coverage area
Solution Approach 1:
The patent establishes a PDU session in advance via the macro coverage network while the device is still within micro coverage network coverage. This preliminary action ensures that when the device moves out of micro coverage area, the pre-established PDU session via macro network can immediately take over, avoiding service interruption and the need for re-establishment procedures.
2Reliability
If a PDU session is re-established via macro coverage network after losing micro coverage, then service continuity is restored, but latency increases and service interruption occurs
Solution Approach 1:
The patent performs preliminary PDU session establishment via the macro coverage network before the device actually leaves the micro coverage area. By having the alternative session ready in advance, the system eliminates the time-consuming re-establishment procedure that would otherwise be required when coverage is lost, thereby reducing latency and avoiding service interruption.
3Adaptability or versatility
If dual SIMs are used for network switching, then network coverage flexibility is improved, but device complexity increases
Solution Approach 1:
The patent enables a single SIM to access both micro coverage network and macro coverage network simultaneously through multi-access PDU session establishment. This approach achieves the network coverage flexibility of dual SIMs while avoiding the device complexity of managing multiple SIM cards and their associated authentication and session management procedures.
Data Source
AI summary
Systems, methods, and devices include techniques for establishing an enhanced multi-access protocol data unit (PDU) session in a multi-network environment. Various registration procedures may be used to allocate resources between a first network (e.g., a Mobile Network Operator (MNO) and a second network (e.g., a Mobile Virtual Network Operator (MVNO). For instance, a method includes sending by a wireless device to a network, indication(s) related to network capabilities of the wireless device. The indication(s) include whether the wireless device supports a multi-access PDU session comprising a first PDU session and a second PDU session. The first PDU session is established via a 3rd Generation Partnership Project (3GPP) access the second PDU session is established via a first non-3GPP. The indication(s) include whether the wireless device supports an enhanced multi-access PDU session comprising a third PDU session, wherein the third PDU session is established via a second non-3GPP access.