LTE Interview Questions and Answers
19
12 LTE interview questions and answers LTE and L TE advanced technology is fast evolving in cellular aren a and demand in the industries have been increased for LTE skilled engineers. These top 12 LTE interview questions and answers help engineers seeking LTE technology job to crack the interview with ease. ne can refer page links mentioned on left side panel to learn more about LTE. !uestion"1# $hat is the difference between LTE %&& and LTE T&&' (nswer"1#The difference lie s in the LT E frame structure in both the %&& and T&& ver sions of the LTE . )n %&& there will be pair of frequencies assigned in the downlink and uplink directions and hence transmissions from multiple subscribes can happen at the same time but on different frequencies as mentioned. )n T&&* one single frequency will be used at different time instants by multiple subscriber terminals +,Es-. oth frame versions of LTE will have 1 ms sub"frame duration and /.0 ms slot duration. ead more. !uestion"2# $hat is resource block in LT E' (nswer"2#LT E frame is divided based on time slots on time ais and f requency subcarrier on frequency ais. esource block is the smallest unit of resource allocation in LTE system. )t is of about /.0ms duration and composed of 12 subcarriers in 1 %&3 symbol. ne time slot is equal to 4 %&3 symbols in normal cyclic prefi and 5 %&3 symbols in etended cyclic prefi. ne full resource block is equal to 12 subcarriers by 4 symbols in normal 67. 8ence it consists of total 9: time;frequency elements referred as resource elements in LTE network. efer LTE Terminol ogy . !uestion"<# $hat are the LTE logical* transport and physical channels' (nswer"<#(ll these channels help LTE ,E establish the connection with the e=ode* maintain the connection and terminate the same. Logical channels are characteri>ed by the in formation that is transferred. Transport channels are characteri>ed by how the data are transferred over the radio interface. 7hysical channel corresponds to a set of resource elements used by the physical layer. 6hannels are further divided into control channel and traffic channel at logical channel stage. ead more. !uestion":# Eplain the difference between eference signal +?- and synchroni>ation signal +??- in the LTE' (lso mention types of ? a nd ??. (nswer":#eference signal +?- is used as pilot subcarrier in LTE similar to o ther broadband wireless technologies such as $L(=* $)3(@ etc. ?ynchroni>ation signal is used as preamble sequence in LTE for synchroni>ation purpose. ? is used for channel estimation and tracking. ?? are of two types vi>. 7"?? and ?"??. 7"?? is used for initial synchroni>ation. ?"?? is used for frame boundary determination. ? are of two types vi>. &emodulation ? +&?- and ?ounding ? +??-. &? is used for sync and channel estimation purpose. ?? is used for channel quality estimation purpose. &? is used in both the uplink and downlink* while ?? is used only in the uplink. efer LTE 7?? ??? and LTE ? &3? ?? pages to know insight concepts of synchroni>ation signal and reference signal. !uestion"0# Eplain LTE cell search procedure followed by ,E. (nswer"0#LT E cell search procedure is used by ,E to camp onto th e LT E cell i.e. e=ode. efer LTE ,E cell search procedure and network entry procedure. !uestion"5# $hat is the function of LTE physical broadcast channel i.e. 768' (nswer"5#(fter initial cell sy nchroni>ation is completed* ,E reads 3) +3aster info rmation block- on 768 +7hysical channel-. roadcast channel is referred as 68 at transport level and 668 at logical level. 3) composed of downlink channel bandwidth in units of s* 78)68 duration* 78)68 resource and system frame number. ead more. !uestion"4# $hat is the advantage of using ?6"%&3( in the L TE uplink' (nswer"4#The main advantage of ? 6"%&3( is low 7( 7 compare to %&3( used in LT E downlink. This increases the efficiency of power amplifier and h ence increases the battery life. ead more.
-
Upload
sachin-patel -
Category
Documents
-
view
365 -
download
38
description
LTE Interview Questions and Answers
Transcript of LTE Interview Questions and Answers
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 1/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 2/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 3/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 4/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 5/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 6/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 7/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 8/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 9/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 10/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 11/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 12/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 13/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 14/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 15/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 16/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 17/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 18/19
7/18/2019 LTE Interview Questions and Answers
http://slidepdf.com/reader/full/lte-interview-questions-and-answers 19/19
