# CS314 - Introduction to Cellular Networks

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• ### CS314 Assignment 1 Solution and Discussion

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@moaaz said in CS314 Assignment 1 Solution and Discussion:

The complete channel bandwidth.

Bandwidth is a fixed quantity, so it cannot be changed. Hence, the channel capacity is directly proportional to the power of the signal, as SNR = (Power of signal) / (power of noise). so for example a signal-to-noise ratio of 1000 is commonly expressed as: 10 * log10(1000) = 30 dB.

Capacity = bandwidth * log2(1 + SNR)

Output1 : C = 30000 * log2(1 + SNR) = 30000 * 11.62 = 348600 bps

• ### CS314 Handouts pdf

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solution #2

• ### CS314 Assignment 2 Solution and Discussion

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Uplink Frequency Band=890 − 915MHz
Downlink Frequency Band = 935 − 960 MHz
Frequency Width for any band =Upper Frequency Limit − Lower Frequency Limit =915−890MHz
=25MHz Width of a frequency channel=200KHz
Maximum Available Channels
= Band Width / Channel Width
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However, actually 124 channels are used if you consider the guard bands used between adjacent channels to avoid any inteference

Answer – 1 (b)

Channel Number (C ) = 50
Uplink carrier frequency for channel 50 = F uplink (50)
Fuplink (50) =Baseuplink frequency + ChannelWidthz * Channel Number
=890MHz+(200KHzx50) =890MHz+(0.2x50MHz )
=890+10MHz
= 900 MHz
= 945 MHz
Alternate Method for calculating Downlink carrier frequency for channel 50
Downlink carrier frequency for channel 50 = Fdownlink (50)
=Basedownlink frequency+ChannelWidthChannel Number =935+(200KHz50)
= 935MHz+(0.250MHz )
= 935+10MHz
= 945 MHz

Ali is able to receive signals from Zain Network due to Roaming Service. Mobilink does not have coverage in Makkah so in order to provide coverage to its subscribers, Mobilink has an agreement with Zain Network. As per this agreement, Zain Telecom provides all the available services to the roaming customer of Mobilink.
Following network components will be used in this case
• Zain’s MSC and VLR
• Mobilink’s Authentication Center (AuC)