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UMTS LTE cells and network.
Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME), Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW. Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG). Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity - AD
A cell is a area of land covered by a radio tower. A radio tower is vertical mount with installed transceiver's. A transceiver is responsible for sending and receiving radio signals over air.  The area covered under a particular cellular tower is known as its cell site. When multiple cell sites interact with each other and with multiple mobile devices a a wireless cellular network is established.  
UMTS LTE Cells and Network Deployment.
Introduction: LTE is an evolved technology on the wireless evolution path shown below:

GPRS –> EDGE –> UMTS –> evolved 3G capabilities such as HSDPA, HSUPA, HSPA+, IMS –> 4G LTE

During the above evolution path many of the core components involved in all-IP LTE were developed and deployed.  
Feasibility of LTE Network and 4G mobile devices: The first generation LTE products should supports multiple standards from the 2G/3G/4G evolution path above.  Current phones supports multi-modes by inter-connecting multiple chip-sets on hardware. Also the re-use of current cell sites are allowed in LTE architecture.

Future Topics:
UMTS LTE UE cell search and cell selection.
LTE broadcast of system information.
LTE cell selection and re-selection.
Related Topics
What is a wireless cell, cellular tower, cell site and cellular network in general ?
UMTS LTE cell search.
UMTS LTE Reference Signals
What is a wireless cell, cellular tower, cell site and cellular network in general ?
Cloud Computing ?
Whenever a document or photo is uploaded on the web, a thread of cloud computing is active. Learn more from here.
4G LTE
Long Term Evolution Topics Homepage.