Handover Anchor Address Storage for Seamless Service Continuity
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Solution Overview
Problem
Handover between different types of access systems in mobile communication networks is challenging due to difficulties in transferring service information, leading to increased handover time and potential service interruptions when the User Equipment (UE) moves between 3GPP and non-3GPP access systems.
Innovation Solution
The UE sends the Inter Access Systems Anchor (IASA) address from the source access system to the destination access system during handover, allowing direct access to the source IASA without the need for DNS resolution, ensuring a consistent service anchor and reducing handover time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DNS resolution is performed to select the IASA during handover between different access systems, then the service information can be transferred, but the handover time increases and service continuity is interrupted
Solution Approach 1:
The UE stores the IASA address obtained from the source access system before handover occurs. This preliminary storage of the anchor point address eliminates the need for DNS resolution during handover, allowing the UE to directly connect to the same IASA in the destination access system and maintain service continuity without interruption
Solution Approach 2:
The UE acts as an intermediary by storing and carrying the IASA address between source and destination access systems. Instead of performing DNS resolution at each handover point, the UE preserves the anchor point identifier and uses it to establish connection to the same IASA in the new system, thereby maintaining service continuity
2Ease of operation
If the UE performs PDP context activation and DNS resolution at the destination access system, then the service can be re-established, but the service is interrupted during handover
Solution Approach 1:
The UE performs preliminary storage of the IASA address before handover occurs. By having this information ready in advance, the UE can directly reuse the same anchor point in the destination system without needing to perform PDP context activation or DNS resolution, thereby avoiding service interruption while maintaining ease of service re-establishment
3Adaptability or versatility
If the UE is anchored onto different IASAs when handing over to the current access system, then the handover can be completed, but the underway service is interrupted
Solution Approach 1:
The UE stores the IASA address from the source system before handover, ensuring that the same anchor point is selected in the destination system. This preliminary preservation of the anchor identifier guarantees that service continuity is maintained while still allowing flexible handover between different access systems
Solution Approach 2:
The UE serves as an intermediary that carries the IASA address information between source and destination systems. By preserving this anchor point identifier through the handover process, the UE ensures that the same IASA is selected in both systems, maintaining service continuity while enabling adaptability across different access technologies
Data Source
AI summary
A method for handover between different types of access systems in some embodiments consistent with the present invention includes: when the UE hands over between different types of access systems, the UE accesses the IASA connected with the UE in the source access system through the destination access system. Furthermore, the present invention discloses a handover system, and a UE that includes an IASA address storing module and an IASA address sending module. The handover system includes: a destination access system, and a source IASA.