LTE Network Architecture

 

MME(Mobility Management Entity) :

Manages UE access network and mobility, as well as establishing the bearer path for UE's. It is responsible for selecting the S-GW for a UE at the initial join and at a time of intra- LTE Handover.

S-GW(Serving Gateway) :

S-GW will act as Router, which will forward user data to P-GW. S-GW creates Bearer table.

P-GW(Packet Data Network Gateway) :

Allocates QOS(Quality of service) to those Bearer table. Allocates the IP address to the UE.

HSS(Home Subscriber Server) :

User's Subscription Profile will be stored in the HSS.MME will download the subscription profile from the HSS when any mobile will be Registered to the MME.

PDN(Packet Data Network) :

PDN is the point with which user can communicate with outside world.

3 Types of PDN :

  1. Internet
  2. Corporate VPN
  3. IMS

DRB= Data Radio Bearer

GTPU= GPRS Tunneling Protocol User Plane

GTPC= GPRS Tunneling Protocol Control Plane


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