5G-RAN to E-UTRAN Handover with Indirect Data Forwarding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies lack a detailed solution for inter-radio access technology handover between Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and 5G Radio Access Network (5G-RAN), particularly in ensuring data forwarding during handover, leading to potential data loss and service disruption.
Innovation Solution
A method for radio access network handover in 5G-RAN that involves determining handover requirements, transmitting messages for handover commands, and performing indirect data forwarding between base stations in E-UTRAN and 5G-RAN, including the use of handover requirement messages, command messages, and tunnel information for Quality of Service (QoS) flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover between E-UTRAN and 5G-RAN is implemented without detailed data forwarding solution, then handover capability is achieved, but data loss occurs and service continuity is disrupted
Solution Approach 1:
The patent establishes data forwarding tunnels and configures QoS parameters before the handover is executed. The source base station sets up indirect data forwarding paths to the target base station in advance, ensuring that data can be seamlessly transferred when handover occurs, thus preventing data loss and maintaining service continuity
Solution Approach 2:
The patent introduces an indirect data forwarding mechanism where data is routed through an intermediate node (source base station) that forwards data to the target base station. This intermediary approach ensures reliable data transfer during handover by maintaining active data paths through the core network, preventing data loss even as the UE transitions between networks
2Reliability
If indirect data forwarding is implemented with QoS flow tunnel information, then data forwarding reliability is improved, but message complexity and processing overhead increase
Solution Approach 1:
The patent uses universal QoS flow tunnel information that can be applied across different handover scenarios and network configurations. The QoS parameters and tunnel setup procedures are standardized to work with various QoS requirements, reducing the need for scenario-specific complex configurations while maintaining reliable data forwarding
Solution Approach 2:
The patent dynamically configures QoS parameters and tunnel characteristics based on the specific handover requirements and data flow characteristics. By adjusting parameters such as QoS flow identifiers, tunnel endpoint addresses, and priority levels, the system achieves reliable data forwarding with optimized message complexity rather than fixed complex procedures
Data Source
AI summary
A radio access network handover method of a base station in a 5G radio access network (5G-RAN) is are disclosed. The method comprising: determining handing over a user equipment (UE) to an Evolved Universal Terrestrial Radio Access Network (E-UTRAN); transmitting a handover requirement message to an Access and Mobility Management Function (AMF); receiving a handover command message from the AMF and transmitting the handover command message to the UE, the handover message such that the UE is handed over from the 5G-RAN to the E-UTRAN; and performing indirect data forwarding to a base station in the E-UTRAN.