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CS314 - Introduction to Cellular Networks

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    zaasmiZ

    @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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    bc170403108 MUHAMMAD WALEEDB

    solution #2

  • CS314 Assignment 2 Solution and Discussion

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    zareenZ

    Answer 1 (a)
    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
    b8d691db-9b02-4184-888e-af6212626f5c-image.png

    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
    Fdownlink (50)=Downlinkcarrier frequency forchannel50+DuplexSpacing =900MHz+45MHz
    = 945 MHz
    Alternate Method for calculating Downlink carrier frequency for channel 50
    Downlink carrier frequency for channel 50 = Fdownlink (50)
    Answer 2 (a)
    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.
    Answer 2(b)
    Following network components will be used in this case
    • Mobilink’s HLR
    • Zain’s MSC and VLR
    • Mobilink’s Authentication Center (AuC)
    Answer 2©
    When Ali makes a call from his phone, the request will first go to Zain Telecom’s BS (Base station) which will direct the request to MSC the Switching Center. MSC has a dedicated VLR (Visitor Location Register) installed which is dedicated for the visitor users. Since, Ali is a visitor, MSC will request VLR to fetch the Ali’s subscription details. If Ali’s subscription is already available, the VLR will authenticate Ali and allow the MSC to proceed with the call. Otherwise, VLR will look up the subscriber information from HLR. HLR before sending the subscriber details, asks AuC (Authentication Center) to authenticate the subscriber. If subscriber is valid and not blocked, then HLR provides the subscriber details to VLR.****

  • CS314 Assignment 1 Solution and Discussion

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    zareenZ

    @zareen said in CS314 Assignment 1 Solution and Discussion:

    What should be the minimum distance kept between two co-channel cells in order to avoid any interference?

    Solution
    90ea116f-7c83-4b42-98be-e2886e9dba26-image.png