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Topics covered in
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,
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,
RF
and
Python Scripting
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Long Term Evolution a 4G technology
Evolved Packet Core (EPC) system architecture for all IP.
LTE is all-
IP advanced core architecture proposed in release 8 of 3GPP to only process packets. The core is named as
Evolved Packet Core (EPC)
.
Mobility Management Entity (MME).
During hand over a UE is switched from source eNodeB to a target eNodeB. The reason of handover is related to mobility of the UE across the cell boundary. Example is of a UE in a moving vehicle.
Serving System (S) Architecture (A) Evolution (E) Gateway
or
Serving Gateway SGW
.
SGW is responsible for handovers with neighboring eNodeB’s.
Packet Data Network (PDN)
SAE Gateway
PGW is responsible to act as an anchor of mobility between 3GPP and non-
3GPP technologies.
What is LTE? Key driving factors behind 4G technology
.
LTE (Long Term Evolution) is a fourth generation (4G) standard for broadband mobile technology. This standard is developed to meet long term future requirements of higher data rates, lower latency, better cell coverage and seamless handover.
LTE Data rates and comparison with 3G rates.
Seamless mobility
in 4G.
All IP is a unified network core for wireless operators to handle both voice and data. If the approach of unified core of all IP is adopted across majority of carriers globally, then mobility will become seamless.
Difference between air, radio and core network.
Enhanced Packet Data Gateway (ePDG)
ePDG is the part of SAE which interfaces with non-
trusted 3GPP IP systems. It acts as a secure termination node for IPsec tunnels established with UE.
UMTS LTE Interfaces in details
S1-
MME
S1-
U
S3
S4
S5
S6a
Gx
S8
S9
S10
S11
S12
S13
SGi
Rx
Sbc
Multiple antenna techniques
-
2X2 MIMO
,
DL MIMO frame format 2x2
,
UL MIMO frame format 2x2
,
Adaptive antenna systems
-
AAS and
Antenna diversity -
AD
Interview Questions.
Main
,
FPGA
,
Digital Fundamentals
Resource -
Hardware components of a smart-
phone.
CPU or processor of a cell phone.
Operating System or simply O/S
RAM, a type of memory
and
SD Memory
Applications for direct user interface.
PIXELS for resolution of screen.
Resources
Verilog
RTL code examples
for front-
end chip design.
Digital
Design Topics
Half-
adder
,
full-
adder
,
Adder-
sub tractor
Stack Organization
-
LIFO, RPN
Parity Generation and error checking
Binary multiplier circuit.
CMOS introduction
Digital fundamentals -
RTL coding guidelines.
ICG
cell,
Assertions
,
$assertkill
,
levels
.
Chandle
Pipeline
vs.
Parallel
processing.
LTE Intro
Data rates
CAR of 4G
SL Mobility
EPC Arch
Interfaces
LTE Cells
Multi Antenna
Access Tech
LTE Frame
Alt Frame
PHY Layer
LTE vs. CDMA
LTE or WiMax
LTE VOIP
LTE
X2 interface
and comparison with S1
LTE Access technologies like -
FDD, TDD, OFDMA and SC-
FDMA.
4G LTE differences in FDD and TDD modes.
LTE Physical layer and generic frame structure.
LTE PHY layer characteristics
LTE alternate frame structure.
LTE cells, network
. UMTS LTE
cell search
,
cell identities and synchronization signals (primary and secondary)
.
LTE vs. CDMA
LTE vs. WiMax
LTE VOIP