User's Manual

Confidential

Chapter 1 Samsung LTE System Overview

LTE eNB System Description v2.0 5

resources, Hybrid Automatic Repeat Request (HARQ)/ARQ processing, Packet

Data Convergence Protocol (PDCP) for packet header compression, and wireless

resources control.

In addition, eNB performs handover by interworking with EPC.

EPC

The EPC is a system, which is located between eNB and PDN. The

subcomponents of EPC are MME, S-GW and P-GW, Multimedia

Broadcast/Multicast Service Gateway (MBMS GW).

 MME: Processes control messages using the NAS signaling protocol with eNB

and performs control plane functions such as UE mobility management,

tracking area list management, and bearer and session management.

 S-GW: Acts as the anchor for user plane between 2G/3G access system, LTE

system, and manages and changes the packet transmission layer for

downlink/uplink data.

 P-GW: Allocates an IP address to UE, acts as the anchor for mobility between

LTE and non-3GPP access systems, and manages/changes charging and

transmission rate according to the service level.

LTE System Manager (LSM)

The LSM provides user interface for the operator to operate and maintain eNB.

The LSM is responsible for software management, configuration management,

performance management and fault management, and acts as a SON server.

Core System Manager (CSM)

The CSM provides user interface for the operator to operate and maintain MME,

S-GW, and P-GW.

Master SON Server (MSS)

The MSS interoperates with local SON server as its higher node, making

optimized interoperation possible for the multi-LSM. The MSS can work with

Operating Support System (OSS) of the service provider who can decide whether

to link them.

Home Subscriber Server (HSS)

The HSS is a database management system that stores and manages the parameters

and location information for all registered mobile subscribers. The HSS manages

key data such as the mobile subscriber’s access capability, basic services and

supplementary services, and provides a routing function to the subscribed receivers.

Policy and Charging Rule Function (PCRF)

The PCRF server creates policy rules to dynamically apply the QoS and charging