Carlos Fernández
Quiz by , created more than 1 year ago

Verify knowledge learned with the LTE course

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Carlos Fernández
Created by Carlos Fernández about 8 years ago
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LTE Questionnaire

Question 1 of 10

1

LTE:

Select one or more of the following:

  • Tries to satisfy the necessities that appeared when data usage started to grow.

  • Only supports packet-switching.

  • Belongs to the third generation of mobile networks because it doesn’t achieve IMT-Advanced requirements.

  • Belongs to the fourth generation of mobile networks because it does achieve IMT-Advanced requirements.

Explanation

Question 2 of 10

1

Some of the fourth generation requirements are:

Select one or more of the following:

  • Minimum bit rates of 100 Mbps in the downlink and 50 Mbps in the uplink.

  • Support for broadcast and multi-cast.

  • Scalable bandwidth from 0 to 20 MHz.

  • High VoIP capacity.

Explanation

Question 3 of 10

1

LTE uses different modulations for its links:

Select one or more of the following:

  • OFDMA is used for the uplink and SC-FDMA for the downlink.

  • OFDMA is used for the uplink and WCDMA for the downlink.

  • WCDMA is used for the uplink and OFDMA for the downlink.

  • OFDMA is used for the downlink and SC-FDMA for the uplink.

Explanation

Question 4 of 10

1

The cyclic prefix:

Select one or more of the following:

  • Can be just normal.

  • May be normal or extended.

  • Lasts 5.2 us the first time and 4.7 us all other times in the normal case, and lasts 16.7 us in the extended case.

  • Lasts 5.2 us the first time and 4.7 us all other times in the extended case, and lasts 16.7 us in the normal case.

Explanation

Question 5 of 10

1

The frame:

Select one or more of the following:

  • Has a duration of 10 ms and is subdivided into ten 1 ms subframes, each of which is split into two 0.5 ms slots.

  • Has a duration of 10 ms and is subdivided into five 2 ms subframes, each of which is split into two 0.5 ms slots.

  • Has a duration of 1 ms and is subdivided into ten 0.1 ms subframes, each of which is split into four 0.025 ms slots.

  • Has a duration of 10 ms and is subdivided into ten 1 ms subframes, each of which is split into four 0.25 ms slots.

Explanation

Question 6 of 10

1

In LTE:

Select one or more of the following:

  • The smallest unit of resource is the Resource Block, which consists of one subcarrier for a duration of one OFDM symbol.

  • The smallest unit of resource is the Resource Element, which consists of one subcarrier for a duration of one OFDM symbol.

  • Each unit of 12 subcarriers (with a subcarrier spacing of 15 kHz) for a duration of one slot is termed a Resource Element.

  • Each unit of 12 subcarriers (with a subcarrier spacing of 15 kHz) for a duration of one slot is termed a Resource Block.

Explanation

Question 7 of 10

1

Some of the downlink’s physical channels and signals are:

Select one or more of the following:

  • Physical Hybrid ARQ Indicator Channel (PHICH).

  • Physical Broadcast Channel (PBCH).

  • SRS (Sounding Reference Signal).

  • PRACH (Physical Random Access CHannel).

Explanation

Question 8 of 10

1

About E-UTRAN:

Select one or more of the following:

  • Is formed by eNodeBs inter-connected with each other by means of interfaces called X2 and to the EPC by means of the S1 interface.

  • X2 interfaces are used to avoid data loss during handovers, to perform load balancing and to perform cancel interference.

  • Is formed by diverse entities, such as MME, S-GW or P-GW.

  • ENodeBs are responsible for managing and allocating radio resources, controlling mobility, positioning, IP headers compression among others.

Explanation

Question 9 of 10

1

The MME:

Select one or more of the following:

  • Serves as a local mobility anchor for the handover between eNodeBs and between 3GPP (GPRS, UMTS, etc.).

  • It is the control node that processes the signaling between the UE and the CN, on which the Non-Access Stratum (NAS) protocols are applied.

  • Is responsible for IP address allocation to UEs, and for activities related to quality of service and flow management.

  • Defines the rules for charging and policy control.

Explanation

Question 10 of 10

1

About innovations:

Select one or more of the following:

  • LTE-A is considered as belonging to the fourth generation.

  • LTE-B provides physical layer improvements and higher energy efficiency.

  • The architecture of LTE-B consists of elements such as VLR, AUC, or MSC among others.

  • LTE-A makes use of relays to improve coverage.

Explanation

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