Dual Connectivity for 5G to 4G Handover Load Distribution
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Solution Overview
Problem
The E-UTRAN base station in 4G systems experiences heavy loads during handovers from 5G to 4G networks, as all data flows are migrated, leading to increased operational burdens.
Innovation Solution
Implementing dual connectivity between 5G NR and 4G EPS systems, where the terminal transmits a dual connectivity parameter to establish connections with both the E-UTRAN and NR base stations, distributing data flows during handovers to alleviate the load on individual base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all data flows are migrated to the E-UTRAN base station during handover from 5G to 4G, then the terminal can access the 4G network for services, but the load on the E-UTRAN base station becomes heavy
Solution Approach 1:
The patent segments data flows into two categories: voice call data flows are migrated to the E-UTRAN base station, while other data flows remain on the NR base station. This segmentation prevents the E-UTRAN base station from handling all data flows, thereby reducing its load while still enabling voice call services on 4G network
Solution Approach 2:
The patent extracts only the necessary data flows (voice call data flows) from the terminal and migrates them to the E-UTRAN base station, while leaving other data flows on the NR base station. This selective extraction approach minimizes the burden on the E-UTRAN base station while achieving the required service functionality
2Productivity
If dual connectivity is established between E-UTRAN and NR base stations, then the load on individual base stations is reduced, but the system complexity increases
Solution Approach 1:
The patent introduces the core network as an intermediary that coordinates the dual connectivity setup. The core network determines which data flows should be migrated to the E-UTRAN base station and manages the interaction between the two base stations, thereby simplifying the overall system architecture and reducing complexity at the terminal and base station levels
Data Source
AI summary
The present disclosure discloses a method and apparatus for system interworking, and relates to the field of wireless communication. The method includes receiving, by a terminal, dual connectivity information transmitted by a first base station in a second system, during an interworking process of handover from a first system to the second system; and establishing, by the terminal, dual connectivity with the first base station and a second base station in the second system based on the dual connectivity information. The first system is a 5G NR, and the second system is a 4G EPS.