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LTE Theory > Theory > Flashcards

Theory Flashcards

LTE theory summary

1
Q

Rel. 8 introduced this…

A

Reference Signal Received Power (RSRP)

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2
Q

Rel. 9 introduced this…

A

Reference Signal Received Quality (RSRQ)

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3
Q

Rel. 10 advancement was…

A

LTE Advanced (True 4G)

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4
Q

Rel. 15+ is…

A

5G

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5
Q

The PLMN is now/also known as…

A

The Evolved Packet System (EPS)

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6
Q

This is the Network side of the LTE architecture…

A

Evolved Packet Core (EPC)

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7
Q

Name the five parts that make up the Evolved Packet Core (EPC).

A

MME, HSS, S-GW, PDN-GW, PCRF

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8
Q

What are the responsibilities of the MME?

A

Call setup/tear-down; control plane for 2G/3G access; authentication; controls one or more Tracking Areas.

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9
Q

What does the Serving Gateway (S-GW) do?

A

Routes and forwards data packets; stores IP addresses

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10
Q

What are the responsibilities of the Packet Data Network Gateway (PDN-GW)?

A

Assigns IP addresses; packet screening; non-3GPP tech support (ie. CDMA2000)

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11
Q

What is the role of the Policy Charging/Rules Function (PCRF)?

A

Sets the Quality of Service (QoS) standards for different types of data sessions.

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12
Q

Name the components of the E-UTRAN.

A

eNodeB

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13
Q

What are the four types of eNodeB identifiers?

A

eNB ID; Cell ID; ECI (E-UTRAN Cell ID); ECGI (E-UTRAN Cell Global ID)

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14
Q

What are the two components of a Tracking Area Identifier?

A

Tracking Area Code (TAC); MCC/MNC (PLMN)

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15
Q

What is a TAI List?

A

A group of TACs that a UE does not need to perform a TAC update while within its boundaries.

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16
Q

Define OFDMA

A

Orthogonal Frequency Division Multiple Access

17
Q

What are the three benefits of using OFDMA?

A

Increased spectral efficiency
Robust/Resistant to multi-path fading
Scalable bandwidth

18
Q

What are the three limitations of OFDMA?

A

Guard Space requirement of 10% (22% for 1.4MHz band)
Sensitive to time/frequency shifts
High Peak to Average Power

19
Q

How does LTE overcome time domain shifts?

A

Cyclic prefix

20
Q

How does LTE overcome frequency domain shifts?

A

Orthogonal subcarriers

21
Q

What is SC-FDMA and how is it used in LTE?

A

Single Carrier Frequency Division Multiple Access.

It is only used on the uplink to increase the battery life of the UE and negate the use of expensive radio technology.

22
Q

What are the two techniques used on the downlink in MIMO technology?

A

Spatial Multiplexing; Transmit Diversity

23
Q

Define Spatial Multiplexing.

A

Takes a signal and divides it up to transmit over different antennas.

24
Q

Define Transmit Diversity.

A

Transmits a signal over multiple antennas for redundancy.

LTE Theory (1 decks)

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