RAN Paging Failure Handling via Core Network Mediation
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Solution Overview
Problem
Persistent radio access network (RAN) paging failures in wireless communication networks, where devices are unclear on how to handle such failures, leading to disruptions in protocol data unit sessions.
Innovation Solution
An apparatus and method that include a processor and transmitter to manage RAN paging failures by suspending protocol data unit session deactivation, triggering core network paging, and establishing a new access network context with a target RAN, including buffering downlink packets and access stratum context, and configuring the target RAN for data forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RAN paging failure is detected and session deactivation is triggered, then the system attempts to handle the failure, but this leads to service disruption and loss of session continuity
Solution Approach 1:
The system performs preliminary actions by suspending the session deactivation procedure when RAN paging failure is detected, and proactively triggers core network paging to locate the UE before attempting to re-establish the session. This prevents service disruption by maintaining session continuity through advance intervention.
Solution Approach 2:
The core network paging mechanism serves as an intermediary between the RAN and the UE. When RAN paging fails, the system uses core network paging as a mediator to successfully locate the UE and restore communication, thereby maintaining session continuity without service disruption.
2Reliability
If the system triggers core network paging to handle RAN paging failure, then session continuity can be maintained, but this increases network signaling overhead and processing time
Solution Approach 1:
The system suspends session deactivation as a preliminary action before triggering core network paging, preserving session context and reducing the time needed for session re-establishment. This preliminary preservation of session state minimizes the overall time loss despite invoking core network paging.
Solution Approach 2:
The system implements a feedback mechanism where the outcome of core network paging triggers appropriate actions: if successful, the session is re-established; if failed, session deactivation is then triggered. This feedback-based decision-making optimizes the balance between maintaining session continuity and minimizing unnecessary signaling overhead.
3Reliability
If the system suspends session deactivation and triggers core network paging, then session continuity is maintained, but this increases network signaling overhead
Solution Approach 1:
The core network paging mechanism acts as an intermediary that resolves RAN paging failures with a single coordinated signaling exchange. By using this intermediary approach, the system maintains session continuity while minimizing the overall signaling complexity compared to multiple retry attempts or immediate session re-establishment procedures.
Solution Approach 2:
The feedback-based decision mechanism ensures that core network paging is only triggered when necessary (upon RAN paging failure detection), and session deactivation is only performed if core network paging fails. This conditional signaling approach reduces unnecessary network signaling overhead while maintaining session continuity when possible.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for responding to RAN paging failures. One apparatus (300) includes a processor (302), a transmitter (310), and a receiver (312). The receiver (312) receives (702) an access network context release request including an indication of RAN paging failure. The processor (302) suspends (704) a protocol data unit session deactivation procedure and triggering core network paging in response to receiving the indication of RAN paging failure. In response to the core network paging failing, the processor (302) resumes (706) the protocol data unit session deactivation procedure. In response to the core network paging succeeding, the transmitter (310) transmits (708) an access network context establishment request to a target RAN. In response to receiving an access network context establishment response from the target RAN, the transmitter (310) transmits (710) a protocol data unit session modification request. In response to receiving a protocol data unit session modification response, the transmitter (310) transmits (712) a data forwarding request to a source RAN.