Base Station Paging Fallback for Light-Connected Mobile Sessions
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Solution Overview
Problem
Current 3GPP systems face challenges in managing mobile devices in a 'light-connected' state, including issues with data loss during RAN-based paging failures, core network paging as a fallback, informing the mobility management entity of state changes, and optimizing operations like load balancing and power saving modes, as well as expediting connection resumption and data transmission.
Innovation Solution
Implementing a base station and core network node configuration that maintains an S1 connection for mobile devices in light-connected mode, allowing anchor base stations to cache user data and facilitate seamless transitions between cells, with the mobility management entity coordinating to avoid unnecessary procedures and expedite data forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station uses RAN-based paging to initiate communication with the communication device, then the paging can be performed in a distributed manner, but the communication device may not respond and the base station lacks visibility into the device's state
Solution Approach 1:
The core network node acts as an intermediary between the base station and the communication device. When RAN-based paging fails, the base station requests the core network node to perform SI-based paging, which has broader coverage and can reach devices in RRC idle state. The core network node forwards paging messages and relays device responses back to the base station, providing the base station with visibility into device state without requiring direct base station-device communication for paging operations.
2Productivity
If the base station attempts communication with the communication device without confirmation of device state, then the paging procedure can be initiated quickly, but the base station may waste resources paging a device that is already reachable or not in a state to receive pages
Solution Approach 1:
The base station performs preliminary actions by first attempting RAN-based paging before escalating to SI-based paging through the core network node. This hierarchical approach allows the system to quickly page devices that are likely to respond (in connected state) before involving more resource-intensive core network paging. The base station also monitors for device responses and adjusts subsequent paging actions based on observed device behavior patterns.
3Productivity
If the base station implements complex logic to determine when to use RAN-based paging versus SI-based paging, then paging can be optimized, but the base station complexity increases
Solution Approach 1:
The paging functionality is segmented into two distinct modes: RAN-based paging handled directly by the base station for quick, localized paging, and SI-based paging handled by the core network node for broader coverage. The base station maintains simple decision logic that checks basic conditions (device response to RAN paging, configured thresholds) and delegates complex paging management to the core network node when needed, reducing base station complexity while maintaining overall system efficiency.
Data Source
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AI summary
A communication system is disclosed in which am anchor base station receives, from a core network node, downlink data for a communication device. The base station attempts (e.g. by RAN-based paging) to initiate communication with the communication device, and when the communication device does not respond to the attempt to initiate communication, the base station sends a message to the core network node, the message requesting initiation of a paging procedure for the communication device (e.g. S I-based paging).