Mobile Network Architecture Questions and Answers

Q: GSM is an example of :

GSM is an example of TDMA cellular systems.GSM divides each 200 kHz carrier into eight time slots, and each user transmits in its own slot, which is time division multiple access. It also uses FDMA to separate carriers, but its defining multiple access scheme is TDMA.CDMA (code division) is used by IS-95 and cdma2000 networks, and FDMA alone was the scheme of first-generation analog systems such as AMPS.

Which of the following are limitations of mobile computing?

Limitations:
i) Device mobility
ii) Power consumption
iii) Human interface with device
iv) Range and Bandwidth
v) Transmission interferences
vi) Wireless connectivity

A.ii, iii, iv and v only
B.i, ii and v only
C.i, ii and iv only
D.i, iii and vi only

Exam Year(s)

DSSSB TGT - 2023,

Answer: A

The limitations of mobile computing are power consumption, the human interface with the device (small screens and keypads), range and bandwidth, and transmission interferences, which are ii, iii, iv and v. Device mobility and wireless connectivity are what makes mobile computing possible, so they are features and not limitations. The other options include one of those two or leave out limitations. Small screens, short battery life, limited bandwidth and interference are the reasons these items count as limitations of mobile devices.

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GSM is an example of :

A.TDMA cellular systems
B.FDMA cellular systems
C.CDMA cellular systems
D.SDMA cellular systems

Exam Year(s)

MH SET - 2020, SET Exam - 2020,

Answer: A

GSM is an example of TDMA cellular systems.

GSM divides each 200 kHz carrier into eight time slots, and each user transmits in its own slot, which is time division multiple access. It also uses FDMA to separate carriers, but its defining multiple access scheme is TDMA.

CDMA (code division) is used by IS-95 and cdma2000 networks, and FDMA alone was the scheme of first-generation analog systems such as AMPS.

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The GSM network is divided into the following three major systems :

A.SS, BSS, OSS
B.BSS, BSC, MSC
C.CELL, BSC, OSS
D.SS, CELL, MSC

Exam Year(s)

UGC NET - 2012,

Answer: A

The GSM network is divided into three major systems: the Switching System (SS), the Base Station System (BSS) and the Operation and Support System (OSS). The SS holds the MSC and the registers (HLR, VLR, AuC, EIR) and handles call switching and subscriber data, the BSS has the base transceiver stations and base station controllers that handle the radio side, and the OSS looks after network operation and maintenance.

BSC and MSC are elements inside the BSS and SS, not systems, and 'CELL' is a coverage area, not a major system. So the other three options name parts of the system as if they were the three systems.

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The Mobile Application Protocol (MAP) typically runs on top of which protocol ?

A.SNMP (Simple Network Management Protocol)
B.SMTP (Simple Mail Transfer Protocol)
C.SS7 (Signalling System 7)
D.HTTP (Hyper Text Transfer Protocol)

Exam Year(s)

UGC NET - 2012,

Answer: C

The Mobile Application Part (MAP) runs on top of SS7 (Signalling System 7), in particular over the TCAP and SCCP layers. MAP is the protocol which GSM networks use to carry signalling between the MSC, HLR, VLR and other nodes for roaming, location updating and handover.

SNMP is used for network management, SMTP for mail transfer and HTTP for web traffic. These are Internet protocols that do not carry the GSM mobility signalling, so none of them is the base layer of MAP.

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Which are the classifications of data used in Mobile Applications ?

A.Private data, User data, Shared data.
B.Public data, User data, Virtual data.
C.Private data, Public data, Shared data.
D.Public data, Virtual data, User data.

Exam Year(s)

UGC NET - 2012,

Answer: C

The data used in mobile applications are classified as private data, public data and shared data. Private data belong to one user or device and are not open to others, public data are open to all, and shared data are used by a group of applications or users. 'User data' and 'virtual data' are not standard classes of this classification, so the options that contain them are wrong. The keyed answer is the third option, private, public and shared data.

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Match the following with respect to the Mobile Computing Architecture.

List - I	List - II
a. Downlink control	1. 100 Mbps
b. Radio communication data rate	2. Residency latency (RL)
c. The average duration of user's stay in cell	3. Sending data from a BS to MD
d. FDDI bandwidth	4. 2-Mbps

Codes : a b c d

A.2 1 4 3
B.3 4 2 1
C.4 1 2 1
D.4 3 1 2

Exam Year(s)

UGC NET - 2012,

Answer: B

The downlink control is sending data from a base station to a mobile device (3), the radio communication data rate is 2 Mbps (4), the average duration of a user's stay in a cell is the residency latency (2), and the FDDI bandwidth is 100 Mbps (1). The code is 3 4 2 1. The other codes give the 100 Mbps figure to the radio link or the residency latency to the wrong item. The keyed answer is the second code.

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