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Sunday, September 19, 2021

Home 5G knowledge What is PDU session in 5G?

What is PDU session in 5G?


What is the meaning of PDU Session in 5G?

In 5G, we use a “PDU Session” to provide end-to-end user plane connectivity between the UE and a specific Data Network (DN) through the User Plane Function (UPF). A PDU Session supports one or more QoS Flows. There is a one-to-one mapping between QoS Flow and QoS profile, i.e. all packets belonging to a specific QoS Flow have the
same “5G Quality of Service Identifier” (5Ql).

what about 4G, is it same concept?

No, 4G uses an “EPS Bearer” to provide end-to-end user plane connectivity between the UE and an Access Point Name (APN) through the Packet Gateway (P-GW). There is a one-to-one mapping between EPS Bearer and QoS profile, i.e. all packets belonging to a specific EPS Bearer have the same “Quality of Service Class Identifier” (QCI). But, take care as PDU Sessions are applicable when using a 5G Core Network.

A Non-Standalone Base Station architecture connected to a 4G Core Network uses EPS Bearers.

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