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.

LTE DL Generic frame structure.

LTE - 4G Wireless Technology

Digital fundamentals.

Interview Questions.

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.
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.

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