Dual Connectivity AMBR Coordination Between Master and Secondary Nodes
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Solution Overview
Problem
In dual connectivity scenarios, ensuring the session-level aggregate maximum bit rate (AMBR) for PDU sessions across master and secondary nodes is challenging, as existing methods lack effective mechanisms to manage bit rates across different network devices serving the same terminal.
Innovation Solution
The communication method involves obtaining and sharing AMBR information between master and secondary network devices, allowing them to adjust and limit bit rates accordingly, ensuring that the aggregate bit rate does not exceed the session-aggregate maximum bit rate threshold by coordinating uplink and downlink flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple network devices serve the same terminal in dual connectivity, then service capacity and flexibility are improved, but managing aggregate bit rate across devices becomes complex and difficult to control
Solution Approach 1:
The patent segments the session-AMBR management by introducing separate AMBR parameters for master node (MN-AMBR) and secondary node (SN-AMBR). This segmentation allows each node to independently manage its portion of the aggregate bit rate, simplifying control while maintaining overall session-AMBR compliance through coordinated enforcement at both nodes.
2Reliability
If AMBR information is shared between master and secondary nodes, then aggregate bit rate control is improved, but information exchange overhead increases
Solution Approach 1:
The patent extracts only the essential AMBR parameters (MN-AMBR and SN-AMBR) needed for bit rate control from the complete session context and transmits them between nodes. This selective extraction minimizes information exchange overhead while ensuring reliable aggregate bit rate control, avoiding transmission of redundant or unnecessary data.
Data Source
AI summary
This application provides a communication method, a network device, and a terminal. The communication method includes: obtaining, by a first network device, a first AMBR of a PDU session, where the first AMBR is an AMBR of a flow that is served by a second network device in the PDU session, the first network device is a master node serving a terminal, and the second network device is a secondary node serving the terminal; sending, by the first network device, first information to the second network device, where the first information includes the first AMBR, so that the second network device provides, based on the first AMBR, the PDU session service for the terminal. The communication method, the network device, and the terminal provided in this application help ensure a session-level aggregate maximum rate requirement in a dual connectivity scenario.