WCT_2025

OFDM or multi-carrier technology provides resilience against ____________

• Tropospheric scattering

• Fresnel clearance

• Multi path fading

• Pathloss

which one of the following modulation schemes are supported by the LTE physical

layer?

• OQPSK

• 8PSK

• 32QAM

• 64QAM

In order to counter the high power requirement of OFDM, LTE uses which scheme for the

uplink?

• 64QAM

• OFDMA

• SC-FDMA

• SOFDMA

In the LTE physical layer, it is generally true that higher order modulation schemes such as

64QAM require...................

• higher transmitted power

• greater FEC complexity

• higher signal to noise ratio

• multiple antennas

which of the following LTE protocol stack layers is responsible for mapping logical

channels to transport channels?

• PHY

• MAC

• RLC

• PDCP

which of the following LTE protocol stack layers is responsible for error correction using

HARQ?

• MAC

• RLC

• PDCP

• PHY

LTE channels that are defined by the type of information that they carry are referred to as

• Transport channels

• Physical channels

• Logical Channels

• Shared channels

Which Link connects one MME to another MME

• A. S11

• B. S10

• C. S1

• D. S4

ITU stands for ___.

 

• A) International Television Union

• B) Internal Telecommunication Union

• C) Inventions for Telecommunication Union

• D) International Telecommunication Union

X2 interface connects eNodeB to

• Other eNodeBs

• Serving Gateway (S-GW)

• Mobility Management Entity (MME)

• Packet Data Network (PDN) Gateway (P-GW)