Dual Connectivity QoS-to-DRB Mapping Between 5G Base Stations
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Solution Overview
Problem
The challenge in 5G communication systems is the inconsistent decision-making by master and secondary base stations regarding the mapping of quality of service (QoS) flows to data radio bearers, leading to inefficiencies and increased signaling overhead during dual connectivity setup.
Innovation Solution
A method for dual connectivity setup involving the master base station transmitting a secondary base station setup request message with QoS flow information, and receiving a response message containing mapping information for DRBs, while the secondary base station determines the appropriate DRB mapping and communicates any necessary changes to the master base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the master base station and secondary base station independently determine QoS flow to DRB mapping, then each base station can optimize its own resource allocation, but inconsistency in mapping decisions occurs between the two base stations
Solution Approach 1:
The master base station pre-determines the QoS flow to DRB mapping relationship before dual connectivity setup, and communicates this mapping to the secondary base station in advance. This preliminary action ensures that both base stations use the same mapping from the outset, eliminating inconsistency while allowing the secondary base station to optimize resource allocation based on the predetermined mapping.
2Stability of the object's composition
If the master base station controls all QoS flow mapping decisions, then mapping consistency is maintained, but the secondary base station cannot optimize its own resource allocation
Solution Approach 1:
The patent segments the decision-making process into two parts: the master base station determines the overall QoS flow to DRB mapping relationship to ensure consistency, while the secondary base station optimizes the specific resource allocation within each DRB based on local conditions. This segmentation allows both mapping consistency and local optimization to coexist.
3Stability of the object's composition
If multiple signaling messages are exchanged to resolve mapping inconsistencies, then mapping consistency can be achieved, but signaling overhead increases
Solution Approach 1:
The master base station includes the QoS flow to DRB mapping information in the initial secondary base station setup request message, performing the mapping determination action in advance. This eliminates the need for subsequent signaling exchanges to resolve mapping inconsistencies, thereby reducing signaling overhead while maintaining 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 disclosure provides a method for connection setup and corresponding master base station and secondary base station. The method includes: transmitting a secondary base station setup request message to a secondary base station; and receiving a secondary base station setup response message which comprises mapping information from a quality of service (QoS) flow to a data radio bearer (DRB). The present disclosure further provides a method of requesting a secondary cell group (SCG) configuration and corresponding master base station and secondary base station. The method includes: transmitting a secondary base station modification request message for requesting SCG configuration information, the secondary base station modification request message carrying indication information for indicating that a master base station needs to obtain SCG configuration information; and receiving a secondary base station modification response message transmitted by the secondary base station, the secondary base station modification response message carrying the SCG configuration information. The present disclosure further provides methods and devices for controlling a session operation and a corresponding computer readable medium.