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4G LTE Downlink generic frame format.   
LTE downlink sub-frame for normal cyclic prefix is shown in Figure below. This generic frame format is common to both TDD and FDD access modes. Each downlink sub frame contains.
Frame Duration = 10 ms or 10/1000000 second.
One Frame has 10 sub-frames.
Sub-frame duration = 1 ms or 1/1000000 second.
One Sub-frame has 2 time slots.
One Time slot = .5 ms or 1/2000000 second.
Each Time slot contains 7 OFDM symbols with normal Cyclic Prefix.
Control - PCFICH, PHICH, PDCCH
Data - PDSCH
Reference signal - MIMO Antenna 1
Reference signal - MIMO Antenna 2
TS - Time Slot (0.5 ms)
LTE frame 2
LTE frame 1
LTE frame n-1
LTE frame n
Sub Frame 1
Sub Frame 2
Sub Frame 3
Sub Frame 9
Sub Frame 10
TS0
TS1
TS2
TS3
TS17
TS18
TS19
TS20
10 ms
1 ms
0.5 ms
Time slot = 0.5 ms
PICS
Interview Questions. Main, FPGA, Digital Fundamentals
Time
Frequency
Time slot = 0.5 ms
Downlink control signaling consists of three physical channels –
(1) Physical Control Format Indicator Channel (PCFICH) to indicate the number of OFDM
symbols used for control,
(2) Physical H-ARQ Indicator Channel (PHICH) which carries downlink ACK/NACK, and
(3) Physical Downlink Control Channel (PDCCH) which carries the scheduling assignments and power control commands.
LTE - Long Term Evolution topics from here
Cloud Computing ?
Whenever a document or photo is uploaded on the web, a thread of cloud computing is active. Learn more from here.
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