Dual Connectivity DRB Mapping for 5G Data Offloading
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Solution Overview
Problem
In dual connectivity scenarios, ensuring data continuity, avoiding conflicts in radio data bearer allocation between master and secondary base stations, and efficiently managing resource configurations and protocol mappings are challenging.
Innovation Solution
A method for establishing dual connectivity that involves notifying the secondary base station of the mapping of QoS Flow to DRB, allowing for data forwarding tunnels to ensure continuity, and dynamically allocating or modifying DRB identifiers to avoid conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data offloading is implemented between master and secondary base stations in dual connectivity, then data transmission capacity and network flexibility are improved, but data continuity and bearer allocation consistency become problematic
Solution Approach 1:
The patent introduces a data forwarding tunnel as an intermediary mechanism between the master base station and secondary base station. When data offloading occurs, the tunnel acts as a mediator to forward data packets, ensuring continuity even when the QoS Flow to DRB mapping relationships differ between stations. This resolves the contradiction by providing a reliable data path that bridges the inconsistency in bearer allocation.
Solution Approach 2:
The patent establishes data forwarding tunnels in advance before data offloading occurs. By pre-configuring the tunnel and determining the mapping relationships beforehand, the system ensures that data continuity is maintained from the outset of offloading operations, preventing potential interruptions that would otherwise occur due to mapping inconsistencies.
2Adaptability or versatility
If master and secondary base stations independently allocate DRB identifiers, then resource management flexibility is improved, but conflicts in DRB allocation occur
Solution Approach 1:
The patent implements a feedback mechanism where the master base station notifies the secondary base station of the QoS Flow to DRB mapping relationships. The secondary base station uses this feedback information to determine appropriate DRB identifiers that do not conflict with those already allocated by the master station, thus maintaining flexibility while avoiding allocation conflicts.
Solution Approach 2:
The patent creates an equipotential state for DRB identifier allocation by ensuring both master and secondary base stations operate with consistent knowledge of mapping relationships. Through notification and determination processes, both stations reach the same understanding of which DRB identifiers are appropriate, eliminating conflicts while preserving independent resource management capabilities.
3Ease of manufacture
If QoS Flow to DRB mapping is determined independently at each base station, then local optimization is improved, but mapping consistency between stations deteriorates
Solution Approach 1:
The master base station determines the QoS Flow to DRB mapping relationships in advance and notifies the secondary base station before data offloading begins. This preliminary determination ensures consistency is established upfront, allowing both stations to operate with aligned mapping information while still enabling local optimization during actual data transmission.
Solution Approach 2:
The notification mechanism acts as an intermediary that transfers mapping relationship information from the master base station to the secondary base station. This intermediary process ensures both stations maintain consistent mapping knowledge, resolving the contradiction between local configuration independence and overall mapping consistency.
Data Source
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AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present application provides a method for establishing dual connectivity to ensure data continuity in 5G architecture. Related information of a mapping of a QoS Flow to a data radio bearer (DRB) is transmitted, by a first node, to a second node; the related information of the mapping carries indication information; response information in response to the information related to the mapping is received from the second node; and based on the response information, data is transmitted to the second node. The method of the present application may correctly configure dual connectivity resources, reduce signaling interaction, avoid configuration conflicts, optimize resource configuration, and improve the reliability of transmitting user data.