QoS Parameter Translation in Dual Connectivity RAN Nodes
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Solution Overview
Problem
In dual connectivity architectures where E-UTRA and NR are connected to the EPC, the treatment of NR DRBs (SCG DRBs) according to the LTE QoS framework is unclear, particularly regarding how the gNB handles SCG DRBs established between the NR gNB and the UE for SCG and split bearer options, and there is a need to map EPC QoS attributes to NR radio bearer parameters.
Innovation Solution
A radio communication system that includes a second RAN node associated with the secondary RAT, which receives a radio bearer setup request from a primary RAN node, configures a radio bearer, translates bearer-level QoS parameters to flow-level QoS parameters conforming to the secondary RAT's QoS framework, and associates these flow-level QoS parameters with the radio bearer, ensuring appropriate QoS treatment for NR DRBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bearer-based QoS framework of LTE is used for NR DRBs in dual connectivity, then compatibility with EPC is maintained, but QoS management precision is insufficient for 5G flow-based requirements
Solution Approach 1:
The patent transforms QoS parameters from bearer-level (LTE) to flow-level (5G) by introducing mapping relationships. The core network node translates bearer QoS parameters into flow QoS parameters, enabling precise flow-based QoS management while maintaining compatibility with the existing EPC bearer-based framework through parameter transformation rather than framework replacement.
Solution Approach 2:
The patent introduces a parameter mapping mechanism as an intermediary between the EPC bearer-based QoS framework and the 5G flow-based QoS framework. This mapping layer translates and adapts QoS parameters between the two frameworks, allowing seamless integration without requiring complete replacement of the EPC architecture.
2Measurement precision
If flow-level QoS parameters are introduced for NR, then QoS management precision is improved, but system complexity increases due to dual QoS framework coexistence
Solution Approach 1:
The patent segments the QoS management function into distinct layers: the EPC maintains bearer-based QoS management while the NR side implements flow-based QoS management. The parameter mapping mechanism bridges these segmented layers, allowing each to operate independently with its own precision while reducing overall system complexity through functional separation.
Solution Approach 2:
The patent adds a new dimension to QoS management by introducing flow-level parameters alongside existing bearer-level parameters. This dimensional expansion allows simultaneous operation of both QoS frameworks at different granularities, improving precision without requiring complete system redesign and managing complexity through hierarchical organization.
3Ease of operation
If LTE bearer-based QoS is applied to NR SCG DRBs, then ease of operation is maintained, but adaptability to 5G QoS framework is insufficient
Solution Approach 1:
The patent creates a universal parameter mapping mechanism that handles both LTE bearer-based QoS and 5G flow-based QoS through a single translation framework. This multi-functional approach allows the system to operate with either QoS framework while maintaining ease of operation, as the mapping mechanism automatically adapts parameters based on the target framework without requiring different operational procedures.
Data Source
AI summary
A second RAN node (2) associated with a secondary RAT configures a radio bearer of the secondary RAT in accordance with a bearer-level QoS parameter conforming to a QoS framework of a primary RAT. In addition, the second RAN node (2) translates the bearer-level QoS parameter to a flow-level QoS parameter conforming to a QoS framework of the secondary RAT and associates the obtained flow-level QoS parameter with the radio bearer of the secondary RAT.