User's Manual

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Chapter 1 Samsung LTE System Overview

LTE eNB System Description v2.0 6

policies differentiated by service flow, or creates the policy rules that can be

applied commonly to multiple service flows. The P-GW includes Policy and

Charging Enforcement Function (PCEF), which allows application of policy rules

received from 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,

P-GW transmits and receives the subscriber’s charging information by

interworking with OCS.

Offline Charging System (OFCS)

The OFCS collects offline charging information by interfacing with S-GW and P-

GW.

The OFCS uses GTP’ (Gz) or Diameter (Rf) interface to interface with S-GW and

P-GW.

Multi-cell/Multicast Coordination Entity (MCE)

The MCE is located between MME and eNB. It is responsible for session control

signaling, admission control, radio resource allocations for eMBMS. M2 and M3

interface is used to interwork with eNB and MME.