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UMTS LTE Cell search .
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
LTE Cell search uses a hierarchical procedure. This is quite similar to WCDMA.  

Base stations in LTE radio cell is identified by a Cell Identity (CI). There are a total of 504 physical layer CI’s. With hierarchical cell search approach 168 unique groups are created in physical layer. Each group consists of 3 unique physical layer cell identities.   
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The above CI information is then transmitted over the Air as part of LTE downlink frames.  The information is represented as Primary synchronization signal and secondary synchronization signal. The complete Cell search procedure on downlink is shown in diagram below.
Downlink cell search is always assumed to be transmitted from base-station towards mobile device.

Cell search primary synchronization signal or PSS - 3 unique physical CI’s
Cell search secondary synchronization signal or SSS -  One of possible 168 physical cell identity groups.

This scheme of cell search is adopted from WCDMA. In WCDMA scrambling  codes are used  to uniquely identify base  stations  and  cells.
504 Physical layer
Cell Identity
DOWNLINK
Mobile
Mobile
Mobile
Base Station
168 groups of 3 unique
physical layer
Cell identities or CI
Mobile
Mobile
Mobile
Group 0
Group 1
Group 167
CI 0
CI 1
CI 2
CI 0
CI 1
CI 2
CI 0
CI 1
CI 2
4G LTE Cell Search Procedure