User's Manual

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Chapter 2 LTE eNB Overview
LTE eNB System Description v2.0 21
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The detailed functions are as follows:
 Self-Configuration
o Self-configuration of Initial Physical Cell Identity (PCI)
o Self-configuration of initial neighbor information
o Self-configuration of initial Physical Random Access Channel (PRACH)
information
 Self-Establishment
o Automatic IP address acquisition
o Auto OAM connectivity
o Automatic software and configuration data loading
o Automatic S1/X2 setup
o Self-test
Self-Optimization
 PCI auto-configuration
The SON server of LSM is responsible for allocating initial PCI in the self-
establishment procedure of a new eNB, detecting a problem automatically, and
selecting, changing, and setting a proper PCI when a PCI collision/confusion
occurs with the neighbor cells during operation.
 Automatic Neighbor Relation (ANR) optimization
The ANR function minimizes the network operator’s effort to maintain
optimal NRT by managing the NRT dynamically depending on grow/degrow
of the neighbor cells. This function automatically configures the initial NRT of
each eNB and recognizes environment changes, such as cell grow/degrow or
new eNB installation during operation to maintain the optimal NRT. In other
words, ANR function updates the NRT for each eNB by automatically
recognizing topology changes such as new neighbor cell or eNB
installation/remove and adding or removing the Neighbor Relation (NR) to or
from the new neighbor cell.
 Mobility robustness optimization
The mobility robustness optimization function is the function for improving
handover performance in eNB by recognizing the problem that handover is
triggered at the incorrect time (for example, too early or too late) before, after,
or during handover depending on UE mobility, or handover is triggered to the
incorrect target cell (handover to the wrong cell), and then by optimizing the
handover parameters according to the reasons for the problem.
 Random Access Channel (RACH) optimization
The RACH Optimization (RO) function minimizes the access delay and
interference through dynamic management of the parameters related to random
access. The RO function is divided into initial RACH setting operation and
operation for optimizing parameters related to the RACH. The initial RACH
setting operation is for setting the preamble signatures and the initial time