Mobility Management Element Handover DCN Selection
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Solution Overview
Problem
In wireless communication systems, particularly during handovers between 5G and 4G networks, there is a challenge in selecting the correct dedicated core network (DCN) for terminal devices, leading to potential service interruptions when the wrong DCN is chosen for terminal devices with specific service requirements.
Innovation Solution
A handover method where the mobility management network element of the first network receives a handover request, identifies the terminal device's usage type or core network identifier, and determines the target mobility management network element in the second network using subscription databases, DNS, NRF, or PCF, ensuring the correct DCN is selected based on the terminal device's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 5G network selects a DCN during handover to 4G network, then service continuity can be maintained, but if the wrong DCN is selected, service interruption occurs
Solution Approach 1:
The patent stores the correspondence between slice information and DCN identifiers in advance during the terminal device's registration or service setup phase. When handover occurs, the mobility management network element directly queries this pre-stored correspondence using the terminal's slice information to determine the target DCN, eliminating the need for real-time selection and ensuring both speed and accuracy.
Solution Approach 2:
The patent introduces a correspondence relationship as an intermediary between slice information and DCN identifiers. This intermediary mapping table acts as a bridge that translates the terminal's service requirements (slice information) into the appropriate network infrastructure (DCN identifier), ensuring accurate matching without complex real-time decision-making.
2Adaptability or versatility
If multiple dedicated core networks are deployed for different service types, then service-specific management is improved, but the complexity of selecting the correct DCN increases
Solution Approach 1:
The patent pre-establishes the mapping relationship between slice information and DCN identifiers during terminal registration or service setup. This advance preparation creates a lookup table that simplifies the handover decision process, transforming a complex selection problem into a simple query operation.
Solution Approach 2:
The system enables self-service by allowing the mobility management network element to autonomously determine the target DCN through querying the pre-stored correspondence based on the terminal's slice information. No manual configuration or complex external coordination is needed during handover, as the system automatically resolves the correct DCN selection.
Data Source
AI summary
This disclosure relates to the field of wireless communications technologies, and in particular, to a handover method, including: receiving, by a mobility management network element of a first network, a first handover request sent by an access network, and learning that a terminal device needs to be handed over to a second network; obtaining an identifier of the terminal device based on the first handover request; determining, by the mobility management network element of the first network, a target mobility management network element of the second network based on the identifier of the terminal device; and sending, by the mobility management network element of the first network, a second handover request to the target mobility management network element of the second network, and requesting to hand over the terminal device to the second network.