The protocol stack spans from the UE$,$ the RAN, and $5$GCN and a downlink data flow from gNB

to the UE$.$

Consider four sub$-$layers in the data link layer, that is$,$ SDAP $($provide services to the IP layer$),$

PDCP$,$ RLC$,$ and MAC $($on top of PHY$).$

Assume we have a total of $16$ IP packets, which will be mapped to radio bearers at the SDAP layer.

Assume that we have three radio bearers $($RB$),x,y,$ and $z,$ where each RB can carry $2-6$ IP packets.

Question $2(15$p$)$ Follow the same assumptions as in Question $1.$ Draw a data flow from the IP network

to the UE over a layered protocol architecture. Refer to the user plane and control plane protocol stack of

NG air interface.

There are Packet Data Gateway $($IP Network$),$ gNodeB$-$UPF in $5$G RAN, and to the UE$.$

Demote protocols at each sub$-$layer and layer.

Map the logical channels, transport channels, and physical channels for all $16$ IP packets on the

corresponding sub$-$layers.