Chapter 3 : Class Work by JIA JIE LIM https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t DIT 2231 : MOBILE COMPUTING ( NOV2020) en-us 2020-12-22 00:01:40 UTC 2024-05-30 19:00:03 UTC hello@padlet.com https://padlet.net/icons/png/1f4f2.png sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956793 a ) Discuss what is HLR and why does it is needed?
Database of profiles of users within its own network. HLR has the necessary information for initiating/ terminating/ receiving call.]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956793 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956794 b) Discuss what is VLR and why does it is needed?
Similar to HLR, but used to temporarily hold profiles of roaming users. VLR contacts the visitor’s HLR to get necessary information to setup temporary profile and provide the services same as VLR.]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956794 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956795 c) Show an illustration to help explain HLR,VLR]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956795 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956796 d) Explain why it is said that Ring topology is suitable for urban area compared to rural area?

Include a diagram that helps to explain.

In rural areas, it is more likely not to use SONET but Microwave signals.
  • High possibility that the wireless carrier would not have fiber/ copper facilities in rural areas.
  • LoS required to setup Microwave connections are easier to achieve in flat rural areas.
  • Easier to deploy high towers which brings longer Microwave shots = larger coverage areas and longer distances between BS.
]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956796 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956798 a) Explain how a mobile station connects to and talks with another mobile station?
Locating mobile phones:
  • MSC attempt to locate MS by paging signal in the last 10 sites that the user had been registered.
  • If the user cannot be located, MSC initiates regional page.
  • If the user cannot be located, MSC initiates global page, where it sends paging signal to all BS in its system.
]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956798 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956799 b ) Explain 5 (FIVE)  Supplementary Services provided by GSM  in details
  • Conferencing
  • Call Waiting
  • Call Hold
  • Call Forwarding
  • Call Barring
]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956799 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956801 a)How will the in-between interfaces differ when a mobile station connects to a PS TN destination?
First, the mobile station will connect to Base Station Controller (BSC). After that connect to Mobile Switching Center (MSC) and switching to Least-Cost Routing of interconnection to PSTN (Landline)]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956801 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956802 b) What features of a GSM system are provided with the help of SIM card in a mobile station?

The GSM network has four separate parts that work together to function as a whole: the mobile device itself, the base station subsystem (BSS), the network switching subsystem (NSS) and the operation and support subsystem (OSS).

The mobile device connects to the network via hardware. The subscriber identity module (SIM) card provides the network with identifying information about the mobile user.]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956802 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956803 c) Mobile Switching Center Provide voice path connection between ? 
  • Mobile phone and landline
  • Between mobile phones
  • Mobile phone and the Internet
]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956803 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956804 d) Explain the core functions of Network Operations Center
  • Fault managements
  • Configuration managements
  • Accounting management
  • Performance management
]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956804 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956807 a) What are the services provided in a GSM system?
  1. Bearer services 
  2. Teleservices
  3. Supplementary services
]]> 2020-12-22 00:01:40 UTC https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956807 sf_limjiajie https://padlet.com/sf_limjiajie/3dsdktitt4sp2i5t/wish/1036956809 b) Illustrate the GSM Architecture 
  • Base Station Subsystem BSS
  • Network & Switching Subsystem NSS
  • Operation & Support Subsystem
  • as well as elements including- MSC, AuC, HLR, VLR, etc.
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