AMF Handover Resource Reservation for Seamless Service Continuity
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Solution Overview
Problem
Current technologies lack an effective method for reserving resources on the target side during base station handover, especially when a user equipment moves out of the AMF service area, leading to changes in the AMF and SMF, which complicates resource reservation.
Innovation Solution
The proposed method involves the Access and Mobility management Function (AMF) obtaining and sending session information to request target resources from the second base station, even if a cross-AMF handover is required, ensuring resource reservation by changing the AMF from the first to the second AMF, and allocating a new SMF if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the AMF changes during cross-AMF handover, then the user equipment can move out of the original AMF service area, but resource reservation on the target base station becomes complicated
Solution Approach 1:
The source AMF performs preliminary actions by obtaining session information from the SMF before the handover occurs, and includes this information in the handover request message sent to the target AMF. This preliminary preparation ensures that the target base station can reserve resources smoothly without complexity arising from AMF changes.
Solution Approach 2:
The source AMF acts as an intermediary that bridges the SMF and target AMF during cross-AMF handover. It obtains session information from the SMF, processes it, and forwards it to the target AMF in the handover request message, thereby simplifying the target base station's resource reservation process despite the AMF change.
2Reliability
If session information is obtained from SMF during handover, then resource reservation can be ensured, but additional signaling overhead is generated
Solution Approach 1:
The source AMF performs preliminary action by obtaining session information from the SMF before handover and including it in the handover request message. This ensures the target base station receives all necessary session information upfront, guaranteeing resource reservation reliability without requiring additional signaling during the handover execution phase.
3Reliability
If handover request message includes session information, then target base station can reserve resources, but message size increases
Solution Approach 1:
The patent merges the session information with the handover request message, combining multiple pieces of information (handover parameters and session information) into a single message. This eliminates the need for separate signaling messages, ensuring the target base station can reserve resources while minimizing the total quantity of signaling traffic.
Data Source
AI summary
Provided are a method for base station handover, a system, and a computer storage medium, the method comprising a first access and mobility management function (AMF) receives handover request information sent by a first base station, the handover request information serving to request handover of a UE from the first base station to a second base station; when the UE does not need to carry out cross-AMF handover, the first AMF sends a handover preparation request to the second base station requesting target resources for the UE; in a cross-AMF handover process, the AMF of the UE changes from a first AMF to a second AMF; when a UE needs to carry out a cross-AMF handover process, the first AMF sends handover request information to a second AMF, and the second AMF sends a handover preparation request to the second base station requesting target resources for the UE.