User's Manual

Ver.
CHAPTER 1. Samsung LTE System Overview
2600-00FKQFGA2
1.0
EPC
The EPC is a system located between the eNB and PDN. The subcomponents of the EPC
are the MME, S-GW and P-GW.
 MME: Processes control messages using the NAS signaling protocol with the 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 the user plane between the 2G/3G access system and the
LTE system, and manages and changes the packet transmission layer for downlink/
uplink data.
 P-GW: Allocates an IP address to the UE, acts as the anchor for mobility between the LTE
and non-3GPP access systems, and manages/changes charging and the transmission rate
according to the service level.
LTE System Manager (LSM)
The LSM provides the user interface for the operator to operate and maintain the eNB.
The LSM is responsible for software management, configuration management,
performance management and fault management, and acts as a Self-Organizing Network
(SON) server.
Core System Manager (CSM)
The CSM provides the user interface for the operator to operate and maintain the MME, S-GW,
and P-GW.
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 policies
differentiated by service flow, or creates the policy rules that can be applied commonly to
multiple service flows. The P-GW includes the Policy and Charging Enforcement Function
(PCEF), which allows application of policy rules received from the PCRF to each service
flow.
Online Charging System (OCS)
The OCS collects online charging information by interfacing with S-GW and P-GW.
When a subscriber for whom online charging information is required makes a call, the P-GW
transmits and receives the subscriber’s charging information by interworking with the OCS.
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