Questionnaire on Cellular concepts

Questionnaire on Cellular concepts

1. The available frequency spectrum in GSM is
a) 45 MHz
b) 30 MHz
c) 200 KHz
d) 25 MHz

2. Number of carriers available in GSM frequency Band are
a) 32
b) 8
c) 124
d) 132

3. The major reason for introducing cellular concepts in GSM is
a) to reduce interference
b) to increase Subscriber Capacity
c) to utilize scarce frequency spectrum

4. Cell reuse is based on one of the following.
a) Reuse of Cell no.
b) Frequency reuse
c) Transmit Power reuse
d) Subscriber identification no. reuse

5. The theoretical shape of a cell is
a) Circular
b) Pentagonal
c) Triangular
d) Hexagonal





6. K-factor in cellular system is
a) Cell size
b) Cluster size
c) Cell Radius
d) Ratio of Subscriber capacity to no. of carriers



8. The frequency reuse ratio in a cluster of cells is determined by
a) no. of frequency carriers in the cluster
b) no. of subscribers in the cluster
c) no. of cells in the cluster
d) no. of Power levels

9. The basic parameter governing the minimum distance between two reused cells is
a) co-channel interference
b) adjacent channel interference
c) mobile station Transmit Power
d) received signal level

10. The cell sectorization is used
a) to increase coverage
b) to increase system capacity
c) to reduce co-channel interference
d) to improve speech quality

11. 1 Erlang of traffic is
a) 60 seconds of use per busy hour
b) 90 seconds of use per busy hour
c) 30 minutes of use per busy hour
d) 60 minutes of use per busy hour

12. Grade Of Service (GOS) for 2% blockage is
a) measure of speech quality
b) measure of probability of a mobile subscriber of accessing a free channel
c) measure of probability of system to access mobile
d) measure of system capacity













Layer 3 Questionnaire

1. The basic function of layer 3 in OSI model is
a) physical addressing
b) frame segmentation
c) logical addressing and Routing
d) flow Control and data retransmission

2. The sub-layers in air interface layer 3 at MS are
a) Radio Resource (RR), Mobility Management (MM) and Connection Management (CM)
b) Call Control (CC), Short Message Service (SMS) and Supplementary Services (SS)
c) LAPD, BTSM & MTP
d) None

3. The functions of RR management sub-layer are
a) register updating, authentication and TMSI reallocation
b) establishment, operation and release of radio channel
c) base Station Radio Power Management
d) call connection, maintenance and release

4. The functions of MM management sub-layer are
a) register updating, authentication and TMSI reallocation
b) establishment, operation and release of radio channel
c) base Station Radio Power Management
d) call connection, maintenance and release

5. The function of Transaction Identifier (TI) field in a typical layer 3 message are
a) to distinguish between messages belonging to RR, MM & CM procedures
b) to identify function of the message being sent
c) as an optional field to carry some information in the message
d) to distinguish multiple parallel activities within 1 mobile station

6. The function of Protocol Discriminator (PD) field in a typical layer 3 message is
a) to distinguish between messages belonging to RR, MM & CM procedures
b) to identify function of the message being sent
c) as an optional field to carry some information in the message
d) to distinguish multiple parallel activities within 1 mobile station




7. The function of Message Type (MT) field in a typical layer 3 message is
a) to distinguish between messages belonging to RR, MM & CM procedures
b) to identify function of the message being sent
c) as an optional field to carry some information in the message
d) to distinguish multiple parallel activities within 1 mobile station

8. The function of Information Elements (IE) field in a typical layer 3 message is
a) to distinguish between messages belonging to RR, MM & CM procedures
b) to identify function of the message being sent
c) as an optional field to carry some information in the message
d) to distinguish multiple parallel activities within 1 mobile station

9. Mobility Management (MM) sub-layer provides services to which of the following entities?
a) Radio Resource (RR), Mobility Management (MM) and Connection Management (CM)
b) Call Control (CC), Short Message Service (SMS) and Supplementary Services (SS)
c) LAPD, BTSM & MTP
d) None from above























Layer 2 Questionnaire

1. The basic function of layer 2 (Data link layer) in general is
a) logical addressing and routing
b) transaction identification and data retransmission
c) frame formation by message segmentation & reassembly
d) logical verification of data

2. The data link layer in air interface is
a) LAPD (Link Access Procedure for ISDN data channel)
b) MTP (Message Transfer Part)
c) LAPDm (modified Link Access Procedure for ISDN data channel)
d) SCCP (Signaling Connection Control Part)

3. The fields of a LAPDm frame are
a) Network Field, Guard Field, Access Field & Response Field
b) Address Field, Control Field, Length Indicator, Information Field & Fill Bits
c) Data Field, Request Field, Stealing Bits, Access Field & End Bits
d) None

4. The Address Field of LAPDm frame contains
a) reserved bit, LPD, SAPI, C/R & EA fields
b) flag bit, BSN, BIB, FSN & FIB fields
c) flag bit, len, spare, service, status & CRC fields
d) none from above

5. The function of LPD field in LAPDm frame is
a) to specify either a command or response frame
b) to identify the user of the service provided by the protocol
c) to specify a particular recommendation of the use of LAPDm
d) as an extended address bit to specify the length of LAPDm address field as either 1 or 2 bytes long

6. The function of C/R field in LAPDm frame is
a) to specify either a command or response frame
b) to identify the user of the service provided by the protocol
c) to specify a particular recommendation of the use of LAPDm
d) as an extended address bit to specify the length of LAPDm address field as either 1 or 2 bytes long




7. The function of SAPI field in LAPDm frame is
a) to specify either a command or response frame
b) to identify the user of the service provided by the protocol
c) to specify a particular recommendation of the use of LAPDm
d) as an extended address bit to specify the length of LAPDm address field as either 1 or 2 bytes long

8. The function of EA field in LAPDm frame is
a) to specify either a command or response frame
b) to identify the user of the service provided by the protocol
c) to specify a particular recommendation of the use of LAPDm
d) as an extended address bit to specify the length of LAPDm address field as either 1 or 2 bytes long

9. The flag bits at the start & end to delimit the frame are not used in
a) LAPD
b) LAPDm
c) MTP2
d) MAP

10. The frame size in LAPDm for TCH is
a) 21 octets
b) 19 octets
c) 8 octets
d) 23 octets

11. The maximum length of frames on the Abis interface is
a) 256 octets
b) 64 octets
c) 264 octets
d) 272 octets

12. The maximum length of frames on the A interface is
a) 256 octets
b) 64 octets
c) 264 octets
d) 272 octets







13. Error detection for LAPDm is carried out by
a) adding 16 redundancy bits to each frame according to a coding scheme chosen for its error detection
b) combination of convolutional & block coding at the physical layer
c) None from above

14. SAPI 0 is used in LAPDm to indicate
a) transfer of signaling messages
b) short Message services
c) supplementary service messages
d) none from above

15. SAPI 3 is used in LAPDm to indicate
a) transfer of signaling messages
b) Short Message services
c) Supplementary service messages
d) none from above