upper layer

The application-oriented layers of the OSI reference model are also referred to as the upper layers.

OSI reference model with the transport and application-oriented layers.

These include the three layers located above the transport layer: the communication control layer (Session Layer), the presentation layer (Presentation Layer) and the application layer (Application Layer).

The layers below the transport layer, i.e. the network layer, the data linklayer and the physical layer, are referred to as the lower layers.