NB-IoT PDU Session QoS Rule Handling in NB-N1 Mode
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Solution Overview
Problem
Existing 5G communication systems face inefficiencies in managing PDU sessions for NB-IoT devices due to mandatory reporting of unsupported features, leading to increased signaling and power consumption, and errors in QoS rule management during mobility, particularly in narrowband coverage.
Innovation Solution
Implementing optional or conditional IEs for Integrity protection maximum data rate and QoS rule handling in PDU Session Establishment and Modification messages, allowing NB-IoT UEs to omit unsupported data transfer information and manage QoS rules efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NB-IoT UEs report Integrity protection maximum data rate information element, then network can determine UE capabilities, but signaling overhead and power consumption increase for devices that do not support N3 data transfer
Solution Approach 1:
The patent extracts the Integrity protection maximum data rate IE from mandatory reporting to optional reporting. The network can request this information only when N3 data transfer is actually supported, rather than requiring all NB-IoT UEs to report it unconditionally. This removes unnecessary signaling and reduces power consumption for devices that don't support the feature.
Solution Approach 2:
The patent makes the IE reporting dynamic based on UE capability and network configuration. The IE is included in PDU Session Establishment Request or PDU Session Modification Request messages only when relevant, allowing the system to adapt the signaling load to actual operational needs rather than using a static mandatory reporting approach.
2Stability of the object's composition
If multiple QoS rules are managed during mobility between wideband and narrowband networks, then service continuity is maintained, but errors occur in QoS rule management in NB-N1 mode
Solution Approach 1:
The patent applies different QoS rule management strategies for different operational modes. In NB-N1 mode, the UE stores QoS rules locally and applies them appropriately based on the current network context, rather than relying on network-provided rules that may not be suitable for narrowband operation. This local adaptation prevents errors while maintaining service continuity.
Solution Approach 2:
The patent performs preliminary storage of QoS rules in the UE before mobility to narrowband networks. By pre-configuring the UE with appropriate QoS rules and storing them locally, the system prepares the device to handle QoS management autonomously in NB-N1 mode, preventing errors that would occur if the UE waited for network-provided rules that may not be applicable.
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method may include: receiving, from a network entity, information associated with one or more quality of service (QoS) rules; checking the information associated with the one or more QoS rules, for a QoS rule associated with a non-default QoS rule and for the QoS rule with a rule operation different from deleting the QoS rule; in case that the UE is in a narrow band (NB)-N1 mode, the QoS rule is associated with the non-default QoS rule and the rule operation is different from deleting the QoS rule, detecting the QoS rule as an error; and transmitting, to the network entity, a protocol data unit (PDU) session modification request message to delete the detected QoS rule.