Cellular-Networks

Question 1
The frequency band allocated for the downlink in GSM is :
A
960 - 985 MHz
B
935 - 960 MHz
C
920 - 945 MHz
D
930 - 955 MHz
Question 1 Explanation: 
There are 2 popular GSM methods.
1. GSM-900
2. GSM-1800
GSM-900 uses 890 - 915 MHz to send information from the Mobile Station to the Base
Transceiver Station (uplink) and 935 - 960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used.
Question 2
The frequency reuse plan is divided into cell grouping using how many cells, where the number of cells equals N ?
A
3
B
10
C
7
D
21
Question 2 Explanation: 
The cluster size N = 7 and the frequency reuse factor is 1/7 since each cell contains one-seventh of the total number of available channels.
Total cells=7*3
=21
Frequency reuse concept, cells with the same letter use the same set of frequencies. A cell cluster is outline in blue color and replicated over the converge area.
Question 3
Which interim standard describes inter-switching networking ?
A
IS - 54
B
IS - 95
C
DS - 45
D
ANSI - 41
Question 3 Explanation: 
→ Interim Standard 95 (IS-95) was the first ever CDMA-based digital cellular technology.
→ The IS-95 standards describe an air interface, a set of protocols used between mobile units and the network.
→ IS-95 is widely described as a three-layer stack, where L1 corresponds to the physical (PHY) layer, L2 refers to the Media Access Control (MAC) and Link-Access Control (LAC) sublayers, and L3 to the call-processing state machine.
Question 4
Theoretically, how many 1.25 MHz Carriers are there in a CDMA cell ?
A
18
B
22
C
9
D
64
Question 4 Explanation: 
→ In CDMA, multiple users share a 1.25 MHz channel by using orthogonal spreading codes (Walsh codes)
→ IS-95a standard designed for AMPS cellular band
→ Each cellular provider is allocated 25 MHz spectrum and ten 1.25-MHz CDMA duplex channels if A AMPS Band provider, 9 if B band provider
There are 4 questions to complete.

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