Address Coordination for 5G Handover UPF Split State
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Solution Overview
Problem
Current data transmission tunnel address coordination methods in 5G networks are inefficient, leading to high overheads in resource admission control and signaling resources when a UE moves across base stations, as they cannot simultaneously switch a PDU session between UPF split and non-split states.
Innovation Solution
A method and device for coordinating data transmission tunnel addresses by determining the UPF split state of a PDU session at a target base station, acquiring and sending the base station downlink address to the SMF network element, and allocating and forwarding the UPF network element uplink address to establish data transmission tunnels, enabling efficient handover and reducing the need for post-handover resource modification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current NGAP protocol is used for address coordination after handover, then the PDU session can be switched to UPF split or non-split state, but the resource admission control efficiency is low and signaling overhead is high
Solution Approach 1:
The patent applies preliminary action by performing address coordination between the target base station and UPF network element during the handover process itself, rather than after handover completes. The target base station obtains the UPF uplink address and coordinates the data transmission tunnel address pairing before the handover is finalized, enabling the PDU session to be switched to the desired UPF split or non-split state immediately without requiring additional post-handover signaling procedures.
2Adaptability or versatility
If address coordination is performed after handover, then the PDU session state can be switched, but the target base station must execute additional resource modification processes
Solution Approach 1:
The patent merges the address coordination process with the handover execution process. The target base station performs address coordination with the UPF network element as an integrated part of the handover procedure, combining multiple functions (handover execution and address coordination) into a single unified process. This eliminates the need for separate post-handover resource modification processes and enables simultaneous switching of PDU session state.
3Stability of the object's composition
If the current protocol is used, then address pairing can be maintained in static scenarios, but dynamic handover scenarios cannot simultaneously switch PDU session state
Solution Approach 1:
The patent applies dynamics by making the address coordination process adaptive to different scenarios. The target base station dynamically determines the appropriate address coordination approach based on whether the scenario is static or involves handover, and whether UPF split or non-split state is desired. This dynamic approach maintains address pairing stability in static scenarios while enabling efficient state switching during handovers.
Data Source
AI summary
Provided are an address coordination method and device, a base station, a session management function (SMF) network element and a storage medium. In a handover process of a terminal from a source base station side to a target base station side, a UPF split state of a PDU session of the terminal may be determined and data transmission tunnel address coordination may be implemented, thereby enhancing flexibility of split control of the PDU session in the handover process of the terminal, preventing the target base station side from executing PDU session resource modify/modification indication and other processes again to perform the data transmission tunnel address coordination after the terminal completes the handover. Resource admission control efficiency of the target base station side can be improved, so that the PDU session enters a reasonable state of UPF split or UPF non-split as soon as possible, and signaling resources between the target base station side and a core network can be saved.