This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Global System for Mobile (GSM)”.
1. Which of the following is the world’s first cellular system to specify digital modulation and network level architecture?
a) GSM
b) AMPS
c) CDMA
d) IS-54
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Explanation: GSM was the world’s first cellular system to specify digital modulation and level architectures and services. It is the world’s most popular 2G technology. It was developed to solve the fragmentation problems of the first cellular systems in Europe.
2. Previously in 1980s, GSM stands for ____________
a) Global system for mobile
b) Groupe special mobile
c) Global special mobile
d) Groupe system mobile
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Explanation: In the mid-1980s GSM was called by the name Groupe special mobile. In 1992, GSM changed its name to Global System for Mobile Communication for marketing reasons.
3. Who sets the standards of GSM?
a) ITU
b) AT & T
c) ETSI
d) USDC
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Explanation: The setting of standards for GSM is under the aegis of the European Technical Standards Institute (ETSI). GSM task was to specify a common mobile communication system for Europe in the 900 MHZ band.
4. Which of the following does not come under the teleservices of GSM?
a) Standard mobile telephony
b) Mobile originated traffic
c) Base originated traffic
d) Packet switched traffic
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Explanation: GSM services follow ISDN guidelines and are classified as either teleservices or data services. Teleservices include standard mobile telephony and mobile originated or base originated traffic.
5. Which of the following comes under supplementary ISDN services?
a) Emergency calling
b) Packet switched protocols
c) Call diversion
d) Standard mobile telephony
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Explanation: Supplementary ISDN services are digital in nature. They include call diversion, closed user groups, and caller identification, and are not available in analog mobile networks. Supplementary services also include short messaging service (SMS).
6. Which of the following memory device stores information such as subscriber’s identification number in GSM?
a) Register
b) Flip flop
c) SIM
d) SMS
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Explanation: SIM (subscriber identity module) is a memory device that stores information such as the subscriber’s identification number, the networks and countries where the subscriber is entitled to service, privacy keys, and other user specific information.
7. Which of the following feature makes impossible to eavesdrop on GSM radio transmission?
a) SIM
b) On the air privacy
c) SMS
d) Packet switched traffic
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Explanation: The on the air privacy feature of GSM makes impossible to eavesdrop on a GSM radio transmission. The privacy is made possible by encrypting the digital bit stream sent by a GSM transmitter, according to a specific secret cryptographic key that is known only to the cellular carrier.
8. Which of the following does not come under subsystem of GSM architecture?
a) BSS
b) NSS
c) OSS
d) Channel
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Explanation: The GSM architecture consists of three major interconnected subsystems that interact between themselves and with the users through certain network interfaces. The subsystems are BSS (Base Station Subsystem), NSS (Network and Switching Subsystem) and OSS (Operation Support Subsystem).
9. Which of the following subsystem provides radio transmission between mobile station and MSC?
a) BSS
b) NSS
c) OSS
d) BSC
View Answer
Explanation: The BSS provides and manages radio transmission paths between the mobile stations and the Mobile Switching Center (MSC). It also manages the radio interface between the mobile stations and all other subsystems of GSM.
10. ___________ manages the switching function in GSM.
a) BSS
b) NSS
c) OSS
d) MSC
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Explanation: NSS (Network and Switching Subsystem) manages the switching functions of the system. It allows the MSCs to communicate with other networks such as PSTN and ISDN.
11. __________ supports the operation and maintenance of GSM.
a) BSS
b) NSS
c) OSS
d) MSC
View Answer
Explanation: The OSS (Operation Support Subsystem) supports the operation and maintenance of GSM. It allows system engineers to monitor, diagnose, and troubleshoot all aspects of GSM.
Sanfoundry Global Education & Learning Series – Wireless & Mobile Communications.
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