Interview Questions.

Q1. Explain The Disadvantages Of 3g?

The value of cell infrastructure , upgrading base stations is very high

Needs one-of-a-kind handsets.

Roaming and statistics/voice work collectively has now not but been carried out

Power intake is excessive

Requires closer base stations and are pricey

Spectrum-license fees, network deployment fees and handset subsidies subscribers are exceptional.

Q2. Do You Know What Is A Typical Antenna Gain?

The antenna gain relies upon on antenna version; in link finances we use around 17dBi.

Q3. What Is Hard Handover?

Hard handover me that each one the antique radio links inside the UE are eliminated before the brand new radio hyperlinks are established. Hard handover may be seamless or non-seamless. Seamless tough handover me that the handover isn't always perceptible to the user. In exercise a handover that calls for a alternate of the carrier frequency (inter-frequency handover) is always performed as difficult handover.

Q4. Do You Know How Does Tma Work?

A TMA reduces machine noise, improves up-hyperlink sensitivity and ends in longer UE battery life. Sensitivity is the minimal input strength had to get a appropriate sign-to-noise ratio (SNR) at the output of the receiver. It is decided by using receiver noise parent, thermo noise power and required SNR. Thermo noise strength is decided with the aid of bandwidth and temperature, SNR is decided via modulation method, consequently the simplest variable is noise figure.

Q5. Tell Me What Is Typical Tma Gain?

TMA commonly has a 12 dB benefit; however, the effective advantage comes from noise discern discount and the advantage is near or equivalent to the feeder loss.

Q6. Explain The Advantages Of 3g?

Overcrowding is relieved in present systems with radio spectrum

Bandwidth, protection and reliability are more

Provides interoperability among provider companies

Availability of constant and variable fees

Support to gadgets with backward compatibility with existing networks

Always online gadgets - 3G makes use of IP connectivity which is packet primarily based

Rich multi media services are to be had

Q7. Can You Please Explain The Difference Between 3g And 2g?

Packet facts pace is higher in 3G, and it's miles as much as 384 KBPS

Voice and sms speed is also 384 KBPS in 3G

2G utilizes special switching strategies for voice and records, wherein as 3G makes use of unmarried switching, regardless of records

3G has as a minimum 2MB of data link of a cell, where in 2G the facts fee is in KBPS

3G has WiMAX facility for quicker VOIP and net

2G makes use of GSM TDMA era with slender band 2 hundred KHz.

3G makes use of CD-MA era with broadband 5 MHz, with identical frequency provider and time.

Q8. Explain High Speed Packet Access?

High Speed Packet Access (HSPA) is a set of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), that extends and improves the performance of current WCDMA protocols. A further fashionable, Evolved HSPA (also called HSPA+), become launched late in 2008 with subsequent adoption global into 2010.

Q9. Explain 3g?

Third generation (3G) wi-fi networks will offer quicker facts trfer costs than current networks. The first era of wireless (1G) became analog cellular. The 2nd generation (2G) is virtual cellular, presenting incorporated voice and records communications. So-called 2.5G networks 

provide incremental speed will increase. 3G networks will provide dramatically progressed statistics trfer quotes, enabling new wireless packages inclusive of streaming media.

Q10. What Is Soft Handover?

Soft handover me that the radio hyperlinks are delivered and eliminated in a manner that the UE always continues as a minimum one radio hyperlink to the UTRAN. Soft handover is completed by using me of macro variety, which refers back to the condition that several radio hyperlinks are active at the same time. Normally soft handover can be used while cells operated on the identical frequency are modified.

Q11. What Is Pole Capacity?

The uplink noise will increase with the loading exponentially. When the up-link noise methods infinity then no greater users may be added to a mobile - and the mobile loading is close to one hundred% and has reached its pole capability

Q12. Explain Wimax?

WiMAX, an acronym for Worldwide Interoperability for Microwave Access, is a telecommunications protocol that provides constant and completely cell net get right of entry to. The modern WiMAX revision affords as much as 40 Mbps with the IEEE 802.16m update expected offer up to 1 Gbit/s fixed speeds. (WiMAX is based totally on the IEEE 802.16 fashionable, also called Broadband Wireless Access). The name WiMAX became created with the aid of the WiMAX Forum, which became fashioned in June 2001 to sell conformity and interoperability of the same old.

Q13. Explain Gsm (worldwide System For Mobile Communications)?

Most popular preferred for mobile telephony systems, originated from Group Special Mobile

The ubiquity of GSM permits the worldwide roaming arrangements among cellular smartphone operators.

Both signaling and speech channels are virtual, and therefore GSM is taken into consideration as 2G cellular phone machine.

GSM general benefited customers the capacity to roam and transfer providers with out changing the hand sets and community operators.

GSM implements low-fee implementation of Short Message Service

Q14. Explain Typical Maximum Path Loss?

The most route loss is dependent on the provider and seller recommendations; typically it is in among 135 to 140dB for urban regions and between a hundred and fifty to 160dB for rural regions.

Q15. What Is Evolution-data Optimized?

Evolution-Data Optimized or Evolution-Data simplest, abbreviated as EV-DO or EVDO and regularly EV, is a telecommunications fashionable for the wi-fi trmission of statistics thru radio alerts, commonly for broadband Internet get right of entry to. It makes use of multiplexing strategies including code department more than one get right of entry to (CDMA) in addition to time department more than one access (TDMA) to maximise both person person's throughput and the general machine throughput. It is standardized by using third Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 circle of relatives of requirements.

Q16. Explain Digital Enhanced Cordless Telecommunications?

Digital Enhanced Cordless Telecommunications (DECT), known as Digital European Cordless Telephone till 1995, is an ETSI trendy for virtual transportable telephones (cordless home phones), usually used for domestic or company purposes. It is known by means of the ITU as pleasurable the IMT-2000 requirements and therefore qualifies as a 3G gadget. Within the IMT-2000 institution of technology, DECT is called IMT-2000 Frequency Time (IMT-FT)

Q17. What Is International Telecommunication Union?

The International Telecommunication Union is the eldest employer in the UN own family nonetheless in existence. It changed into based because the International Telegraph Union in Paris on 17 May 1865 and is nowadays the leading United Nations employer for records and verbal exchange generation problems, and the worldwide focal point for governments and the non-public sector in growing networks and services.

Q18. What Is Hlr (home Location Register)?

For GSM and CDMA wireless networks

It's obligation is to authenticate and authorize subscribers and their services.

Q19. Rscp Stands For?

RSCP stands for Received Signal Code Power - the strength per chip in CPICH averaged over 512 chips.

Q20. Explain Gprs (fashionable Packet Radio Service)?

Packet oriented cellular facts carrier to be had to the users of 2G cell systems.

It is global machine for speaking via cell phones using GSM as well as in 3G systems.

GPRS statistics trfer is charged according to MB of site visitors trferred, wherein as in circuit switching, information trfer is charged in line with minute of connection time

GPRS is higher packet switching carrier, rather than circuit switching.

2G cell systems are mixed with GPRS and called 2.5 G.

Provides moderate speed statistics trfer by the use of unused TDMA channels, inclusive of GSM.

Q21. Explain Sir?

SIR is the Signal-to-Interference Ratio - the ratio of the energy in committed physical control channel bits to the energy density of interference and noise after dispreading.

Q22. What Is 2g?

2G (or 2-G) is short for 2d-generation wi-fi cellphone technology. Second technology 2G cell telecom networks have been commercially launched at the GSM popular in Finland in 199@Three number one blessings of 2G networks over their predecessors had been that phone conversations have been digitally encrypted, 2G systems have been drastically greater green on the spectrum bearing in mind far extra mobile smartphone penetration stages; and 2G brought records offerings for mobile, beginning with SMS text messages.

Q23. What Is 3gpp Long Term Evolution?

LTE (Long Term Evolution) is the trademarked undertaking call of a high overall performance air interface for mobile cell telephony. It is a mission of the 3rd Generation Partnership Project (3GPP), operating under a named trademarked by one of the institutions inside the partnership, the European Telecommunications Standards Institute.

Q24. Explain Enhanced Data Rates For Gsm Evolution?

Enhanced Data fees for GSM Evolution (EDGE) (also called Enhanced GPRS (EGPRS), or IMT Single Carrier (IMT-SC), or Enhanced Data fees for Global Evolution) is a backward-well suited digital cellular cellphone generation that lets in advanced records trmission costs, as an extension on top of widespread GSM. EDGE is taken into consideration a 3G radio generation and is a part of ITU's 3G definition.

Q25. What Is A Typical Nodeb Sensitivity Level?

The carrier and load determines the NodeB sensitivity; in wellknown, in a no-load condition, the sensitivity is among -115dBm to -125dBm.

For Ericsson, the NodeB sensitivity degree is calculated at round: 

CS12.2: -124 dBm ,PS-sixty four: -119 dBm, PS-128: -115 dBm, PS-384: -115 dBm

Q26. Explain Iden(included Digital Enhanced Network)?

A wireless era for Motorola

It has the skills of digi-mobile phone, 2 manner radio, alphanumeric pager and information modem / fax modem in a unmarried community

Operational bands are 800 MHz, 900 MHz and 1.Five GHz

iDEN is based on TDMA(Time Division Multiple Access) and GSM architecture

For voice compression it makes use of Motorola's Vector Sum Excited Linear Predictors vocoder

For handing over sixty four KBPS over a 25 KHz channel, it makes use of QAM modulation.

IDEN is designed to serve the mobile person for having access to records quickly without wearing numerous gadgets.

Q27. What Is 4g?

4G refers to the fourth generation of cell wi-fi requirements. It is a successor to 3G and 2G standards. The nomenclature of the generations generally refers to a alternate within the essential nature of the service. The first changed into the flow from analogue (1G) to digital (2G) trmission. This turned into observed by way of multi-media assist, spread spectrum trmission and at the least 200 kbit/s (3G) and now 4G, which refers to all IP packet-switched networks, mobile ultra-broadband (gigabit velocity) access and multi-provider trmission.

Q28. What Is Universal Mobile Telecommunications System?

Universal Mobile Telecommunications System (UMTS) is one of the 0.33-era (3G) mobile telecommunications technology, which is likewise being evolved right into a 4G technology. The first deployment of the UMTS is the release99 (R99) structure. It is detailed via 3GPP and is part of the worldwide ITU IMT-2000 fashionable.

Q29. Tell Me What Is A Typical Nodeb Maximum Output Power?

The maximum NodeB output strength is generally 20W or 40W, this is, 43dBm or 46dBm.