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Question 1: Which of the following scenarios would produce the high user data rate?
a. 16 QAM, Coding rate 95%, 2X2 MIMO b. 64 QAM, Coding rate 95%, 2X2 MIMO
c. 64 QAM, Coding rate 33%, 2X2 MIMO d. 64 QAM, Coding rate 33%, Tx Diversity
Question 2: What is the maximum theoretical user data rate in a LTE network with a 5 MHz channel bandwidth?
a. 1.1 Mbps b. 1.7 Mbps c. 42.5 Mbps
d. 170 Mbps Question 3: Which of the following f ollowing number of LTE RBs could NOT be allocated to a UE in the uplink?
a. 1 b. 4 c. 7
d. 9
Question 4: What would the peak uplink rate at the MAC layer Master your semester withbe Scribd of a Free Foron 30this Days Sign to vote title UE using 25 RBs, 64 QAM and a coding rateRead of up 95%? & The New York Times Useful Not useful Special offer fora. students: Only $4.99/month. 10 Mbps
b. 20 Mbps
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a. Port 1. b. Port 20. c. Port 21.
d. Port 80.
Question 7: Which of the following criteria are regarded as acceptab for voice over LTE?
a.Tr <80 msec and lost/delayed blocks <10 % b.Tr <80 msec and lost/delayed blocks <1 %
c.Tr <10 msec and lost/delayed blocks <8 % d.Tr <10 msec and lost/delayed blocks <1 %
Question 8: In an LTE system if high interference is at the edge of th bands then which channel below is expected to get impacted the mo
A. PUSCH B. PUCCH
C. PDSCH D. PRACH
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Question 9: What is the maximum value of RSRQ that can be reporte by UE ? Download With Free Trial
A. 0 db B. -3dBm
C. +3dBm Master your semester with Scribd D. -1 dBm & The New York Times
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D. SIB6 Sheet Music
Question 12: The UE Context on the enodeB can be torn down by?
A. UE B. MME
C. HSS D. PCRF Question 13: Which Link connects one MME to another MME?
A. S11 B. S10
C. S1 D. S4 Question 14: What is the main drawback of using TCP for real time applications?
A. Incurs costs to the operators You're Reading a Preview B. Due to its handshake behavior, it is not suited for real time Unlock full access with a free trial. applications - More delay, Loss etc
C. TCP does not support QoS mechanism Download With Free Trial D. All of the above Question 15: Which OSI Layer is used for switching?
A. Session Layer Master your semester with Scribd B. Transport Layer & The New York C. Data Link Times Layer Special offer forD. students: Only $4.99/month. Network Layer
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LTE Questions and answers -2
Q1. How does the UE know how to behave in idle mode?
The UE reads system information in order to acquire the necessary informati e.g. cell selection, cell reselection, paging and random access parameters. Q2. What is the purpose of Radio Connection Supervision?
To utilize the network resources as efficient as possible, i.e. releasing inactiv and out-of-sync UEs. Also to avoid undue charging of subscribers. Q3. Scheduler interacts with which entities? You're Reading a Preview
Link adaptation, Quality of Service framework and Power Control Unlock full access with a free trial.
Q4. What is the purpose of Capacity Management? Download With Free Trial
To avoid overload in the network. Admission Control can reject connection requests in order not to jeopardize the stability of the network. Congestion Control can release connections that cause overload. Note that Congestion Control is not used in the early releases.
Master your semester with Scribd Read Free Foron 30this Days Sign up to vote title Q5. List at least four different kinds of connected mobility type & The New York Times Useful mode Not useful Special offer for students: Only $4.99/month.
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Intra eNB HO, Inter eNB HO, X2 HO, S1 HO, GSM Session Continuity, WCDM
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-When the cell on which it is camping is no longer suitable -When the UE, in camped normally state, has found a better neighboring cell than the cell on which it is camping -When the UE is in limited service state on an acceptable cell
Q8. What is a DRX cycle? How can one calculate the DRX cycle length Time between two paging occasions is called DRX cycle. DRX cycle length =
10 (ms)
Q9. How many Quality Class Indicators (QCI) are standardized by the 3GPP?
a. 3 b. 7 c. 9 d. 64 Q10. What is the smallest scheduling unit?
You're Reading a Preview The smallest time/frequency entity that the scheduler may assign consists of twelve sub-carriers (180 kHz)Unlock in the frequency and a sub-frame (1m full access with a freedomain trial. in time. This corresponds to two 180kHz * 0.5ms physical resource blocks th are consecutive in time and isDownload referred With to asFree a Scheduling Block (SB). Trial
Q11. Which resources are controlled by scheduler in UL and DL?
UL: Physical Resource Blocks , PDCCH Resources, Baseband Processing Powe DL: Physical Resource Blocks, DL Power, PDCCH Resources, TX rank, Baseba Read Free Foron 30this Days Sign up to vote title Processing Power Not useful Useful Cancel anytime.
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Which physical channels are controlled by scheduler? Special offer forQ12. students: Only $4.99/month.
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PMI – Pre-coding Matrix Indicator is UE’s recommendation of the pre-coding matrix to be used by the system. PMI is only reported if UE operates in spati multiplexing mode.
RI – Rank Indicator is UE’s recommendation for the number of layers i.e. streams to be used in spatial multiplexing. RI is only reported if UE is operat in spatial multiplexing mode.
CFR (CQI part of CFR) impacts Link Adaptation by suggesting modulation and coding rate. Suggestion is then used to select a proper TF. Q14. Which channels are used to report CQI?
Physical Uplink Control Channel – PUCCH, Physical Uplink Shared Channel PUSCH Q15. What is the difference between periodic and a-periodic CQI Reporting?
The periodic CQI report is carried by PUCCH. If the UE is allocated PUSCH resources to send UL data in the same sub-frame as the You're Reading a Preview scheduled periodic CQI report, the periodic CQI report will use the PUSCH, together with UL data transmission. order Unlock full In access with a to freeget trial. more detailed CQI report the eNB can trigger aperiodic CQI report when needed. The a-periodic CQI report is transmitted on PUSCH, together data or alone. Download Withwith FreeUL Trial Q16. What is the granularity of the CQI report?
The CQI report types are be divided into: - wideband, - UE selected sub-band, and - higher layer configured sub-band.
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The wideband report provides one CQI value for the entire downlink system
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BSR – Buffer Status Report informs the scheduler about the amount of the d to be sent in UL by the UE.
BSR – Buffer Status Report informs the scheduler about the amount of the d to be sent in UL by the UE. A BSR is triggered when at least one of the following criteria is fulfilled:
UL data arrives in the UE transmission buffer and the data belongs to a radio bearer (logical channel) group with higher priority than those for which data already existed in the UE transmission buffer. BSR is triggered when UL-SCH resources are allocated and number of padding bits is larger than the BSR size when the UE arrives to a new cell The periodic BSR timer expires
Q19. What is the main purpose with Power Control?
Power control and power configuration reduces inter-cell interference and po You're Reading a Preview consumption. This leads to higher cell capacity and the access with a free trial. control of maximum data rateUnlock for afullUE at cell edge. In addition, it maximizes battery life for the UE. Download With Free Trial
Q19. What is C-RNTI and GUTI in LTE? C-RNTI (Cell Radio Network Temporary Identifier):-
Master your semester with Scribd Free Foron 30this Days Sign up to vote title the UE du The eNodeB (Evolved Node B) assigns the UE a Read C-RNTI to identify & The New York Useful Not useful exchange of Times all information over the air. The C-RNTI is assigned during the Special offer forsetup students: ofOnly the$4.99/month. RRC Connection
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(Idle Mode à Connected Mode transition) betwe a UE and an eNodeB and is valid only for that RRC Connection. Once the UE
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transition) between the UE and the MME and is valid only as long as the UE i attached to the MME that assigned the GUTI. Once the UE leaves the Trackin Area(s) of an MME the "Attachment" has to be moved (Inter-MME handover) and the "new" MME will assign a "new" GUTI to the UE. Embedded within the GUTI are the PLMN ID of the service provider and the MME Identity. Thus, th GUTI uniquely and globally identifies a UE attached to a specific MME in a specific Service Providers LTE Network in a specific Country. The MME may choose to periodically re-assign a "fresh" GUTI to a UE that is attached to it.
LTE Questions and answers -3
Q1. What is the difference between CFRA and CBRA?
CFRA – Contention FREE Random Access – Preamble reserved Used data transfer requiring UE for Handover between cellsYou're and Downlink Reading a Preview synchronization
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CBRA – Contention BASED Random Access – Preamble randomly selected us Download With Free Trial for Initial network access, Access following a radio link failure, Handover between cells, Downlink data transfer requiring UE synchronization, Uplink data transfer requiring UE synchronization
Q2. What is Link Adaptation in LTE? Master your semester with Scribd Read Free Foron 30this Days Sign up to vote title & The New York Times Useful Not useful Adjusting transmission parameters according to the channel condition is calle Special offer forlink students: Only $4.99/month. adaptation.
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It may improve the peak rate, cell Capacity, covetage and tries to schedule t best part of the frequency band for each UE
Q5. What does the feature “Dynamic GBR Admission Control” mean?
It secures that that there are resources for GBR users and protects non-GBR users from starvation
Q6. What is the difference between connected mode mobility and idle mode mobility?
Idle mode mobility relies on UE measurements and UE decisions whether to make a cell reselection or not. The MME keeps track of the UEs on a TA level Connected mode mobility relies on UE measurements and eNB decisions whether to make Handover or not. The UE position is known on cell level by eNB. Q7. What is the main task of the UE in handover? You're Reading a Preview
The UE is ordered to make certain measurements and to report events when the event criteria are fulfilled.Unlock The full eNB evaluates access with a free trial. the measurements and makes HO decisions. In case of an HO, the eNB orde the UE to go to the target cell.Download With Free Trial Q8. How many HO events are there in LTE?
A1: Serving becomes better than threshold A2: Serving cell quality drops below and absolute threshold Read Free Foron Days Sign up to vote title amount A3: A neighboring cell becomes better than serving cell by a30this certain Not useful (qHyst). Useful Cancel anytime. Serving cell becomes worse than absolute threshold1 AND neighbor cell Special offer forA5: students: Only $4.99/month. becomes better than another absolute threshold2.
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The interruption time at release with redirect is shortened as the UE does not have to read system information before accessing the cell. It improves the end user experience of the CS Fallback feature and also Inactive UEs can be released quicker. System information from target cell is included in the release message
Q11. List ANR functionality in LTE.
Neighboring cells are added to neighbor lists X2 interface is established Neghboring cells can be removed from list if they are not used during a predefined time OSS-RC is notified about add/remove of neighbor
You're Reading a Preview Q12. Which are the requirements from the UE side in ANR? Unlock full access with a free trial.
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The UE must be capable of reading and reporting CGI. (If a UE capable of reporting CGI is not available, all external cells that
are possible neighbor cells must be defined manually.)
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measurement gaps to measure PCI on other LTE frequencies, scrambling code (SC) of UTRANand Base Station Identity
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following table from 36.133. Sheet Music
Q13: How many resource elements are used to carry reference signa
8 RE's are used to carry reference signals and 16 RE's used when 2 antenna ports are in used. To allow the UE to distinguish between the anttena ports reference signals are staggred in time with transmission suspended alternati on each antenna port when the other is transmitting.
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