Mobility from 5GS to EPS for PDU session carrying data flow
By identifying and releasing non-transmitting PDU sessions through AMF, and replacing values ranging from 5 to 15 with values ranging from 1 to 4 in EBI replacement, the problem of the target MME not supporting 15 EPS bearers was solved, and reasonable bearer mapping and resource management in 5GS to EPS mobility were realized.
CN114902733BActive Publication Date: 2026-06-16TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
- Filing Date
- 2020-12-18
- Publication Date
- 2026-06-16
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Figure CN114902733B_ABST
Abstract
A method performed by a network node for transporting protocol data unit (PDU) sessions of a user equipment (UE) during a mobility procedure of the UE from a fifth generation system (5GS) to an evolved packet system (EPS) is disclosed. The method includes one or more of the following steps: determining that a target mobility management entity (MME) of the mobility procedure in the EPS supports a first number of EPS bearers, the first number of EPS bearers being less than a second number of EPS bearer identities (EBIs) assigned to a plurality of PDU sessions (e.g., and their associated quality of service (QoS) flows) of the UE to be transported from the 5GS to the EPS; determining which PDU sessions and / or QoS flows of the UE are not to be transported to the target MME; and releasing, requesting release of, or initiating release of the PDU sessions and / or QoS flows that are not to be transported to the target MME.
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