Default DRB Configuration Negotiation in 5G Multi-Connectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In a 5G mobile communication system with dual-connectivity or multi-connectivity scenarios, the issue arises when multiple network devices establish default data radio bearers (DRBs) for a single session, leading to ambiguity in determining the correct DRB for uplink transmission, as the terminal device cannot ascertain the mapping relationship between an uplink QoS flow and a DRB without explicit configuration.
Innovation Solution
A communication method where network devices negotiate the configuration status of a default DRB through message exchanges, allowing only one network device to configure the default DRB, thereby preventing multiple devices from establishing default DRBs for the same session, and ensuring proper mapping during uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple network devices establish default DRBs for a single session in dual-connectivity or multi-connectivity scenarios, then the terminal device can have multiple connection paths for uplink transmission, but the terminal device cannot determine the correct DRB for uplink transmission due to mapping ambiguity
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends uplink data packets to multiple network devices, and each network device feeds back whether it has configured a default DRB. Based on this feedback, the terminal device determines which network device's default DRB to use for uplink transmission, thereby resolving the mapping ambiguity while maintaining multi-connectivity capability
Solution Approach 2:
The patent introduces a negotiation message as an intermediary between network devices to coordinate default DRB configuration. The negotiation message allows network devices to exchange information about their default DRB configuration status and reach a consensus on which device should handle the default DRB, preventing conflicts and ensuring clear mapping relationships
2Productivity
If the terminal device maps uplink data packets to multiple default DRBs, then transmission paths are diversified, but the mapping relationship becomes ambiguous and transmission efficiency decreases
Solution Approach 1:
The patent performs preliminary negotiation between network devices before the terminal device establishes uplink transmission. Through pre-negotiation of default DRB configuration status, the network devices determine in advance which device will handle the default DRB, allowing the terminal device to establish clear mapping relationships without complexity during actual transmission
Data Source
AI summary
The present disclosure relates to communication methods and network devices. In one example method, a first network device receives a first message sent by a second network device, where the first message is used to notify whether the first network device configures a default data radio bearer (DRB), and the first network device and the second network device are network devices that provide a multi-connectivity service for a same terminal device. The first network device determines, based on the first message, whether to configure the default DRB.