Paging State Management for Non-3GPP User Plane Connectivity
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Solution Overview
Problem
In wireless communication systems, devices in CM idle state over non-3GPP access face challenges in maintaining user plane connectivity, leading to decreased throughput due to the need for re-registration procedures when transitioning between 3GPP and non-3GPP access technologies, and existing solutions do not effectively manage downlink data transmission and paging across different access technologies.
Innovation Solution
The system allows devices to maintain user plane connectivity by determining whether to page or transmit data over 3GPP or non-3GPP access based on policies and states, using indicators to manage session establishment and re-establishment across different radio access technologies, ensuring efficient data transmission and minimizing re-registration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices perform re-registration procedures when transitioning between 3GPP and non-3GPP access, then connectivity can be re-established, but throughput decreases due to the re-registration overhead and delays
Solution Approach 1:
The system performs preliminary actions by pre-establishing and maintaining user plane connectivity parameters and session information before access transitions occur. The network stores connectivity state information (PDU sessions, QoS parameters, bearers) in advance so that when a device needs to switch between 3GPP and non-3GPP access, the connectivity can be restored without full re-registration procedures, thus maintaining throughput while ensuring reliability.
2Productivity
If the system manages downlink data transmission and paging across different access technologies, then data delivery efficiency improves, but system complexity increases due to the need to track multiple access states and policies
Solution Approach 1:
The system segments the management of downlink data and paging by separating the handling of different access technologies into distinct logical components. The network maintains separate connectivity state information for 3GPP and non-3GPP access, allowing independent management of each access type's data transmission and paging parameters. This segmentation reduces the complexity of tracking all access states simultaneously while improving data delivery efficiency through optimized per-access management.
Solution Approach 2:
The system introduces intermediary structures (such as connectivity state information databases and session management functions) that mediate between the different access technologies and the core network. These intermediaries handle the complexity of tracking multiple access states, applying policies, and coordinating data transmission across 3GPP and non-3GPP networks, thereby reducing overall system complexity while maintaining high data delivery efficiency.
3Reliability
If devices are configured to page over 3GPP access for non-3GPP routed sessions, then user plane connectivity can be established, but device policies may be violated by forcing data transmission over specific access types
Solution Approach 1:
The system implements dynamic configuration where the paging and data transmission parameters are not fixed but can be adjusted based on real-time conditions and device policies. The network can dynamically determine whether to page over 3GPP or non-3GPP access based on the device's current state, available resources, and configured policies. This dynamic approach ensures user plane connectivity is established reliably while maintaining adaptability to policy requirements, allowing the system to flexibly respond to changing conditions without forcing specific access types.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A wireless device transmits an indication of whether the device should be paged over a 3 GPP access when a core network has data ready to transmit for PDU sessions over a non-3 GPP access. A session management function (SMF) of the core network receives a data notification indicating that the core network has data ready to transmit to the wireless device for a PDU session over the non-3 GPP access. The SMF determines whether to transmit a paging request to an access and mobility management function (AMF) of the core network based on a paging state of the SMG, a paging state of the wireless device, or a connection management idleness state of the wireless device. The AMF determines whether to transmit a paging message to the wireless device.