PDU Session Status Indication via RRC Configuration Signaling
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Solution Overview
Problem
Determining the activated or deactivated state of a protocol data unit (PDU) session at the non-access stratum (NAS) layer of a terminal device is challenging, as existing methods lack clear indications for protocol data unit session status.
Innovation Solution
A method where a terminal device indicates the status of a PDU session based on configuration signaling sent by a network device, allowing the NAS layer to determine whether a PDU session is activated or deactivated by correlating the status with data radio bearers (DRBs) and performing activation or deactivation processing accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If configuration signaling is sent to indicate PDU session status, then the NAS layer can determine activated or deactivated state, but the complexity of signaling and processing increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the RRC layer acts as a mediator between the physical signaling and the NAS layer. The RRC layer receives configuration signaling containing PDU session status information and processes it before passing to the NAS layer, thereby simplifying the NAS layer's burden while ensuring accurate status determination.
Solution Approach 2:
The patent segments the PDU session status indication process into distinct layers: the RRC layer handles the reception and initial processing of configuration signaling, while the NAS layer focuses on making decisions based on the processed status information. This segmentation reduces the complexity at each individual layer while maintaining overall system reliability.
2Reliability
If PDU session status indication is implemented through configuration signaling, then session activation/deactivation can be determined, but the time required for status determination increases
Solution Approach 1:
The patent applies preliminary action by having the RRC layer process and prepare the PDU session status information in advance before the NAS layer needs to make decisions. The configuration signaling is pre-processed to extract relevant status information, so when the NAS layer receives it, the work is already partially done, reducing the time required for status determination.
Solution Approach 2:
The patent implements a feedback mechanism where the RRC layer continuously monitors and updates the PDU session status, and this status information is fed back to the NAS layer in real-time. This allows the NAS layer to make timely decisions without waiting for periodic status checks, thereby reducing the time loss while maintaining accurate status indication.
Data Source
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AI summary
Disclosed in the present invention is a protocol data unit session status indication method, comprising: a terminal device indicates activation and/or deactivation of a protocol data unit session on the basis of configuration signaling sent by a network device. Also disclosed in the present invention are a terminal device and a storage medium.