lets talk about LTE Architecture- SERVICE, EPC, E-UTRAN and User Equipment.

In the LTE network is divided into 2 basic networks, namely:

1. EUTRAN (Evolved Universal Terrestrial Radio Access Network)

2. EPC (Evolved Packet Core)

lte architecture

SERVICE

IP Multimedia Subsystem (IMS) is a good example of cars that can be used in the service layer connectivity Services to provide services on top of IP connectivity provided by the lower layers.

For example, to support voice, IMS can provide Voice over IP (VoIP) and interconnectivity of existing circuits witched networks and ISDN PSTN Media Gateway through site inspections.

EPC-Evolved Universal Terrestrial Radio Access Network

EPC is functionally equivalent to existing 3GPP Networks witched packages.

EPC consist of:

  • MME (Mobility Management Entity): SAEGW is a combination of the two gateways, Serving Gateway (S-GW) and packet data gateway (P-GW).
  • Home Subscriber Server(HSS)
  • Policy and Charging Rules Function (PCRF)

Mobility Management Entity (MME):

saegw MME is a controller node in the access network LTE teach. The EU sleep (idle mode), saegw MME is responsible for tracking and paging procedure including retransmission there in.
saegw MME is responsible for selecting SGW (Serving Gateway SAE) which will be used during the time originally attached to intra-EU EU Delivery LTE.
Used to control carrier a different viewpoint R99 / 4 this is still controlled by the gateway

Policy and Charging Rules Function (PCRF): In order to control and manipulate QoS and load rating and billing

Home Subscriber Server (HSS): For subscriber management and security, ASC and HLR combination

Serving SAE Gateway (SGW): Set the path and transmits data packets to each user as an anchor / link between the EU and the time between teaching ENB as a link connecting the 3GPP LTE technology (in this case 2G and 3G)

Gateway Packet Data Network (PDN GW): Provides for the relationship of the EU to provide a packet network connection relationship between non 3GPP LTE technology (WiMAX) and 3GPP2 (CDMA 20001X and EVDO)

E-UTRAN-Evolved Universal Terrestrial Radio Access Network

Role of Radio Access Network (RAN), ie NodeB and RNC is replaced with ENB, so as to reduce operational and maintenance costs of the device other than simple network architecture.

E-nodeB functions: all radio protocols, saegw mobility management, header compression and packet retransmission all as a network, E-UTRAN is simply connected mesh eNodeBs eNodeBs X2interface neighborhood.

User Equipment:

Functional EU is a platform for communication applications that network signal for creating, maintaining and removing the communication link to the end user needs. This includes mobility management functions such as teaching and reporting terminal location, and the EU carried out as described network