54 GSM Interview Questions and Answers

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GSM Technology frequently Asked Questions by expert members with experience in GSM. These interview questions and answers on GSM Technology will help you strengthen your technical skills, prepare for the interviews and quickly revis e the concepts. concepts. So get preparation for the GSM Technology job interview

54 GSM Technology Technology Questions and Answers: 1 :: What is the GSM? (Answer (Answer.php?a=What_is .php?a=What_is_the_GSM) _the_GSM) GSM, which stands for Global System for Mobile for Mobile communications, reigns as the world’s most widely used cell phone technology. phone technology. Cell phones use a cell phone service carrier’s GSM GSM network by searching for cell phone towers in the nearby area. area. The origins of GSM can be traced back to 1982 when when the Groupe Spécial Mobile (GSM) was created by the European Europea n Conference of Postal and Telecommunications Administrations (CEPT) (C EPT) for the purpose of designing a pan-European mobile technology. technology.

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2 :: I know that the main function of bts is to is to air interface interface signaling. But why? (Answer (Answer.php? .php? a=I_know_that_the_main_function_of_bts_is_to_air_interface_signaling_But_why) a=I_know_that_the_main_function_of_b ts_is_to_air_interface_signaling_But_why)

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mobile station is normally mobile in nature which is an advantage over pstn network network . and in order to provide connection connection to mobile st s tation we use radi radio resource (air)... (air)...

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in order to provide interface between mobile and bss . bts is used.. a bts is responsible to cover a small geographical area called cell...


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GSM Technology Related Quiz Categories: Nation Nat ional al Ge…

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Analogy Anal ogy (/q… 3 :: Explain What is the deference between Rx Lev Sub and Rx Lev Full? What you mean by Link Budget? (Answer.php? Sequen Seq uence ce S… a=Explain_What_is_the_deference_between_R a=Explain_What_is_the_defer ence_between_Rx_Lev_Sub_and_Rx_Lev_FullW x_Lev_Sub_and_Rx_Lev_FullWhat_you_mean_by_Link_Budget) hat_you_mean_by_Link_Budget)

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Rx_Level_Full is measured when DTX is off & Sub is when DTX

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is on. RX Lev Full: Its is nothing but the Mobile transmit the measurment report(SACCH multiframe) for every 480ms. this multiframe containes 104 TDMA frames, in 104 TDMA frames 4 TDMA frames for Decode the BSIC and remaining 100 TDMA frames for Average measurment of serving cell and neighbouring cell.This average measurment of 100 TDMA frames are RX Lev Full RX Lev Sub: DTX is a discontinouse trasmission, When the mobile conversation 40% of the time either Trasmitter or Receive is idle. When DTX is ON, DTX will switch off the Trasmitter or Receiver when they is no speech Pulses. only few TDMA frames will trasmit, the average of this TDMA frames is called RX Lev Sub, give you proper measurment of

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RX level


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4 :: Tell me What is the dierence between FER and BER? (Answer.php? a=Tell_me_What_is_the_di a=T ell_me_What_is_the_dierence_betw erence_between_FER_and_BER) een_FER_and_BER)

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Error ratios used in conjunction with GSM speech channels: · Frame Erasure Rate, FER, is defined as the amount of swept speech frames (260 bits each) divided by the amount of transmitted speech frames. The speech frame is swept if even one of its most important 50 bits is observed not to be correct. The three parity bits following the 50

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class Ia bits are used for error detection. |  Interview Questions (index.php)  Home (../index.php)

|  Online Quiz Tests (/quiz/) | · Bit Error Rate, BER, is the ratio of erroneously received bits to all received bits. It is

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important to notice that BER is evaluated before channel decoding, i.e. after equaliser. BER is used for defining the RXQUAL value

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5 :: Explain what is the relation between RXLEV [0 to 63] and rxlev [-110 to -47]? (Answer.php? a=Explain_what_is_the_relation_between_RXLEV_0_to_63_and_rxlev_-110_to_-47)

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Rx level 0 to 63 is GSM unit. While -110 to -47 is dbm Rxlevel unit of GSM. When we will add 110 to Rxlevel [dbm],it will get convert into GSM unit 0 to 63.


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6 :: Explain about LTE and GSM internetworking. Is it like GSM is used for backbone comm in LTE? (Answer.php? a=Explain_about_LTE_and_GSM_internetworking_Is_it_like_GSM_is_used_for_backbone_comm_in_LTE) Long Term Evolution (LTE) is the next step from 3G/WCDMA & HSPA for many already on the GSM technology curve but also

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for others too, such as CDMA operators. This new radio access technology will be optimized to deliver very fast data speeds of up to 100Mb/s downlink and 50Mb/s uplink (peak rates). Designed to be backwards-compatible with GSM and HSPA, LTE incorporates Multiple In Multiple Out (MIMO) in combination with Orthogonal Frequency Division Multiple Access (OFDMA) in the downlink and Single Carrier FDMA in the uplink to provide high levels of spectral efficiency and end user data rates exceeding 100 Mbps, coupled with major improvements in capacity and reductions in latency. LTE will support channel bandwidths from 1.25 MHz to 20 MHz and both FDD and TDD operation. Although both LTE and WiMAX use the OFDMA air interface, LTE has the advantage of being backwards compatible with existing GSM and HSPA networks, enabling mobile operators deploying LTE to continue to provide a seamless service across LTE and existing deployed networks. Several major mobile operators, including some running CDMA networks today, have indicated they will adopt LTE in the next few years. Japanese mobile operator NTT DOCOMO has said that it is aiming to launch a commercial LTE network by the end of 2009, while in the U.S., the largest CDMA operator, Verizon Wireless, is currently trialing LTE with a view to launching a commercial LTE service in 2010. LTE- Advanced LTE-Advanced extends the technological principles behind LTE into a further step change in data rates. Incorporating higher order MIMO (4x4 and beyond) and allowing multiple carriers to be bonded together into a single stream, target peak data rates of 1Gbps have been set. LTE-Advanced also intends to use a number of further innovations including the ability to use non-contiguous frequency ranges, with the intent that this will alleviate frequency range issues in an increasingly crowded spectrum, self back-hauling base station and full incorporation of Femto cells using Self-Organising Network techniques. LTE-Advanced will be 3GPP’s technology as a candidate for the ITU-R IMT-Advanced process, which is intended to identify ‘4G’ technologies.


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7 :: What is the main dierence between GSM and CDMA? (Answer.php? a=What_is_the_main_dierence_between_GSM_and_CDMA)

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The main difference between GSM and CDMA is: In GSM, the |  Interview Questions (index.php) |  Online Quiz Tests (/quiz/)  Home (../index.php) entire frequency band is not available to the end-user,

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while in CDMA the entire frequency band is available to the end-user. So, the Frequency Re-use factor is 1 in CDMA. GSM Works as follows: --------------------The entire frequency band is divided into chunks and each such chunk is divided into timeslots and each such portion is made available to a user. CDMA Works as follows: ----------------------The entire frequency band is available to the user. So, in order to differentiate, the transmission from each user is "spread" or coded using an unique code given to individual user. At the receiving end, the spread information is decoded.


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8 :: Which is the digital modulation used today in telecom? (Answer.php? a=Which_is_the_digital_modulation_used_today_in_telecom) Currently the digital modulation used in telecom is GSMK GMSK is a form of modulation used in variety of digital radio communication systems.It has an advantage4s of being able to carry digital modulation while still using the spectrum efficiently. One of the problems with other forms of phase shift keying is that the sidebands extend outwards from the main carrierand this can cause interference to the other radio communication systems using nearby channels.


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9 :: What are the various blocks in GSM architecture? (Answer.php? a=What_are_the_various_blocks_in_GSM_architecture) these are the various block in gsm architecture 1>BSS-Base Station Subsystem a.MS b.BTS c.BSC 2>NSS-Network Swithing Subsystem a.HLR b.VLR c.AUC d.MSC e.OMC 3>Public Network a.PSTN b.ISDN c.Data Networks


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10 :: Do you know what is Telecom regulatory body of India? (Answer.php? a=Do_you_know_what_is_Telecom_regulatory_body_of_India) TRAI-Telecom Regulatory authority of India it gives spectrum,it allocate new operator,and for which circle u hve to provide your Network. If operator cross thatCircle then TRAI can also ban that operator or take Fine also.


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11 :: Explain What is the dierence between Diplexer and Duplexer and what position? (Answer.php? a=Explain_What_is_the_dierence_between_Diplexer_and_Duplexer_and_what_position) diplexer is used if we want to use same antenna line[feeder] for two different type of waves.like using same feeder for gsm n cdma transmission to gsm..even if to physically separateed antennas are there only a set of feeder will be required DUPLEXER is used if we want same antenna to transmit n receive..instead of using two separate ones..


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12 :: What is the dierent between CDU C and CDU A? (Answer.php? a=What_is_the_dierent_between_CDU_C_and_CDU_A) CDU A uses filter combiner and c uses hybrid


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13 :: How do you link a T1 from the 1st BTS to 2nd BTS? (Answer.php? a=How_do_you_link_a_T1_from_the_1st_BTS_to_2nd_BTS) There r so many ways o transferring E1/t1 FROM ONE BTS TO ANOTHER..used twisted pair cable w E1T1 card or RRI w in use but power off ..so many ways..


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14 :: What is the value for TEI 1st T1? (Answer.php?a=What_is_the_value_for_TEI_1st_T1) SS7 is the protocol used for transmission of non voice dats transfer[signalling ],that r used for call setup etc


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15 :: What is the SSI? (Answer.php?a=What_is_the_SSI) Small-scale integration; the process of concentrating semiconductor devices in a single integrated circuit.


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16 :: What is the dierence between gsm and umts? (Answer.php? a=What_is_the_dierence_between_gsm_and_umts) The answer can be found at: rfwireless-world.com/Terminology/GSM-vs-UMTS.html


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17 :: What is the dierence between sqi and rxqual? (Answer.php? a=What_is_the_dierence_between_sqi_and_rxqual) If someone knowns please let me know.....


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18 :: Do you know what is GSM technology? (Answer.php? a=Do_you_know_what_is_GSM_technology) ★ Short

form of Global System for Mobile Communications, is a wireless network system

★ A standard for digital cellular mobile communications ★ International roaming arrangements are enabled among mobile network operators, by providing

the subscribers to use their personal mobile phones anywhere in the world. ★ GSM

is considered as second generation mobile, as signaling and speech channels are digital

★ The

carriers can be replaced without replacing mobile phones.

★ The

ubiquity of GSM implementations is also enabling the switching between network operators,

who can choose equipment from many GSM equipment vendors. ★ GSM pioneered low cost SMS implementation ★ The

GSM standard includes a worldwide emergency telephone number feature.


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19 :: What are the services oered by GSM Technology? (Answer.php? a=What_are_the_services_oered_by_GSM_Technology) ★ The

services offered by GSM are ISDN compatible

★ GSM

allows synchronous data and asynchronous data to be transported as bearer service, one

of the telecommunication services offered by GSM, and forms ISDN terminal ★ The

data could be either transparent service or nontransparent service

★ Telephony

is one of the services offered by GSM, which an emergency and the service provider

is notified by dialing 3 digits ★ By

using appropriate fax adapter, G3 fax service is supported

★ One

of the features of GSM is Short Messaging Service

★ Certain

services, namely supplementary services are provided on top of teleservices or bearer

services by GSM, such as, caller identification, call forwarding, multiparty conversations, barring outgoing calls and call waiting.


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20 :: Explain the maximum data rate supported by a GSM system? (Answer.php? a=Explain_the_maximum_data_rate_supported_by_a_GSM_system) The maximum data rate supported by a GSM system is 9.6 kbps. However there are extensions to GSM standard to improve throughput.


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GPRS is one of the extended GSM service. |  Interview Questions (index.php)  Home (../index.php)

|  Online Quiz Tests (/quiz/) |  Forum (../forum/index.php) | The extended standards of GSM allows theoretical data rates on the order of 114 Kbit/s, but with


throughput closer to 40Kbit/s in practice.


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54 GSM Interview Questions and Answers

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