LTE Network Architecture

Hi All,

        Lets today discuss something more about LTE i.e. its Architecture.
It mainly consists of 3 Main Components :-

1. Evolved Packet Core (EPC).
2. User Equipment (UE)
3. E-UTRAN - Evolved UMTS Terrestial Radio Access Network.

 Evolved Packet Core :-

      Its an IP-Based core network system. Its a Always-On Connection. All Services including Voice calls are carried by IP Network i.e. VOIP (Voice Over Internet Protocol).
     Components of EPC are - MME, S-GW, P-GW, HSS, PCRF, etc.

• MME (Mobile Management Entity) - Responsible for Establishment & Releasing of Signaling (bearer) between User & Packet Core Network. Handles Mobility Management like Location Registration, Authentication, Handover with HSS (Home Subscriber Server).
• S-GW (Serving Gateway) - It acts as Router, forward & receive data between Wireless Base Station eNodeb or 3GPP access networks such as 2G/3G & the PDN (Packet Data Network) Gateways (P-GW). for Roaming, S-GW & P-GW provides boundaries between Operators.
• P-GW (Packet Data Network - PDN Gateway) - It Communicates with outside world using SGi interface. Each PDN is identified by an Access Point Name (APN). Its functions includes IP Address Assignment to Terminals, User Authentication, QoS (Quality of Service) Control, Charging Data (as per PCRF), also capable of Deep Packet Inspection (DPI) - Involves either to Pass or Drop the User Data Packet.
• HSS (Home Subscriber Server) - Its like HLR (Home Location Register), Its a Central Database, contains all information about all network operator's subscriber.
• PCRF (Policy Control & Charging Rule Function) - Its responsible for Policy Control Decision Making. It function is to either accept or reject data packets & also check the charging method from users & instruct S/P-GW & Access Network to work accordingly.

User Equipment (UE) :-

       Its same as the mobile equipment used in UMTS & GSM Network. It contains following modules like,
ME (Mobile Equipment) - handles all Communication Functions.
TE (Terminal Equipment) - Terminates the Data Stream.
UICC (Universal Integrated Circuit Card) - Also know as SIM Card, which stores user specific data, like home network identity, security keys, user's phone number.

E-UTRAN (the Access Network):- 

       It handles all the Radio Communications between Mobile & EPC, It provides Higher Data Rates, Lower Latency & Specifically designed for Packet Data. It has just one component i.e. Evolved Base Station called eNodeB or eNB, which interfaces with UE.
Each eNB is a Base Station that controls mobiles in one or more cells. The Base Station that is Communicating with a Mobile is term as Serving eNB.
eNB connects with each other via X2 Interface & they connect to the PS core network via S1 Interface.

More Updates Coming Soon, till than HaPpPpPpYyYyYyYy Reading.

Comments are most Welcomed.

CheeeeEEEERs..
Telecom Tigers Team 
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