User's Manual

Ver.
CHAPTER 2. System Overview
2600-00FKQFGA2
1.0
2.4.2 Protocol Stack
The inter-NE protocol stack of the eNB is as follows:
Protocol Stack between UE and eNB
The user plane protocol layer consists of the PDCP, RLC, MAC, and PHY layers.
The user plane is responsible for transmission of the user data (e.g. IP packets) received
from the upper layer. In the User plane, all protocols are terminated in the eNB.
The control plane protocol layer is composed of the NAS layer, RRC layer, PDCP layer,
RLC layer, MAC layer and PHY layer. The NAS layer is located on the upper wireless
protocol. It performs UE authentication between UE and MME, security control, and
paging and mobility management of UE in the LTE IDLE mode.
In the control plane, all protocols except for the NAS signal are terminated in the eNB.
Figure 4. Protocol Stack between UE and eNB
NAS
RRC
PDCP
RLC
MAC
L1
NAS
S1-AP
SCTP
IP
L2
L1
RRC
PDCP
RLC
MAC
L1
S1-AP
SCTP
IP
L2
L1
UE LTE-Uu eNB
Relay
MME S1-MME
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