Multi-Connection Data Radio Bearer Control for Uplink QoS Mapping
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Solution Overview
Problem
In a 5G mobile communication system with a multi-connection setup, the UE cannot determine which data radio bearer (DRB) to use for uplink data transmission due to the absence of explicit configuration, leading to potential issues in QoS flow (QF) transmission when the default DRB is configured at the secondary node.
Innovation Solution
Establish a split protocol data unit session with M quality-of-service flows across N radio access network nodes, designating one node as the master node and others as secondary nodes, and configure a default data radio bearer on any one of these nodes, ensuring consistent uplink address mapping for QF transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a split PDU session is established with QoS flows mapped to different RAN nodes, then the system can utilize multiple connections for data transmission, but the UE cannot determine which DRB to use for uplink transmission
Solution Approach 1:
The patent introduces an intermediary mechanism where the network side (gNB) maintains mapping relationships between QoS flows and DRBs, and provides guidance to the UE through configuration messages. This intermediary mapping layer resolves the contradiction by allowing the UE to transmit uplink data without explicitly knowing which DRB to use, while the network correctly routes the data based on the pre-established mappings.
2Adaptability or versatility
If the default DRB is configured at the SN node, then the SN can handle uplink data, but the CN cannot correctly identify the uplink address for QoS flow routing
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mapping relationships between QoS flows and DRBs, and pre-establishing the uplink address mappings at the CN before actual data transmission occurs. This ensures that when data is transmitted, the CN already has the correct routing information to identify the uplink address regardless of which node (MN or SN) the default DRB is configured at.
3Measurement precision
If explicit DRB configuration is provided to UE, then the UE can accurately select DRBs, but the system complexity increases
Solution Approach 1:
The patent implements self-service by allowing the UE to automatically determine DRB selection based on pre-configured parameters and QoS flow identifiers, without requiring complex explicit configuration for each transmission. The UE uses the pre-provided mapping information to autonomously select the appropriate DRB, reducing configuration complexity while maintaining accuracy.
Data Source
AI summary
Provided are a data radio bearer control method, device, and system for a multi-connection system. The data radio bearer control method for a multi-connection system comprises: establishing a split protocol data unit session comprising M quality of service flows, the M quality of service flows being respectively established on N radio access network nodes, wherein one of the N radio access network nodes is a master node, and N−1 radio access network nodes other than the master node among the N radio access network nodes are secondary nodes, M and N are positive integers, and M≥2 and N≥2; and establishing a default data radio bearer for the split protocol data unit session, and configuring the default data radio bearer on any one of the radio access network nodes.