5G QoS Error Handling via New 5GSM Cause Values
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Solution Overview
Problem
Current 5G non-access stratum specifications lack defined exception handling for Quality of Service (QoS) rule operations, leading to ambiguity in UE behavior and error management during PDU session modifications.
Innovation Solution
Introduction of two new 5G session management causes: semantic error (cause value #83) and syntactic error (cause value #84) to explicitly define UE behavior, ensuring proper error handling by checking QoS rules in PDU session modification command messages, and implementing procedures to handle these errors by rejecting or releasing PDU sessions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new error handling causes are introduced to define UE behavior, then reliability of QoS operations is improved, but device complexity increases
Solution Approach 1:
The patent introduces two new 5GSM cause values (semantic error #83 and syntactic error #84) to parameterize different types of QoS rule errors. This allows the system to distinguish and handle different error conditions systematically, improving reliability without requiring complex behavioral definitions beyond standardized cause value usage.
2Manufacturing precision
If strict error checking procedures are implemented, then manufacturing precision of QoS rule configuration is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements preliminary error checking by defining specific validation rules that must be satisfied before QoS rule operations are executed. The UE checks whether packet filters exist, whether QoS rules match expected patterns, and whether modifications are valid before applying changes. This preliminary validation ensures configuration precision while maintaining ease of operation through automated checking.
3Loss of information
If comprehensive error handling is implemented, then loss of information is reduced, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE validates received QoS rule modifications against defined criteria and provides error feedback through standardized 5GSM cause values. When semantic or syntactic errors are detected, the UE rejects the modification and notifies the network with specific cause codes, preventing information loss while using simple, standardized feedback rather than complex error management procedures.
Data Source
AI summary
A method of enhanced error handling for 5G QoS operations is proposed. A PDU session defines the association between the UE and the data network that provides a PDU connectivity service. Each PDU session is identified by a PDU session ID, and may include multiple QoS flows and QoS rules. Within a PDU session, there should be one and only one default QoS rule. The default QoS rule indication (DQR) and the QoS flow identifier (QFI) of a signaled QoS rule should not be changed. Two new 5G session management (5GSM) causes are defined: a semantic error in the QoS operation (cause value #83) and a syntactic error (cause value #84) in the QoS operation. The UE should check the QoS rule provided in a PDU session modification command message for different types of QoS rule errors.