Wireless Communication concepts

Jan 12 • Resources • 51907 Views • 30 Comments on Wireless Communication concepts

Ques 1.What is wireless communication concept ?
Answer 1. Wireless communication is the transfer of information between two or more points that are not connected by any physical medium.Wireless communications can be via:
1. Radio communication.
2. Microwave communication.
3. Light, Visible and Infrared communication.

Ques 2. What do you mean by frequency reuse ?
Answer 2. Each cellular Base Station is allocated a group of radio channels to be used. These radio channels can be used by another base station which is at a suitable distance away from it.

Frequency reuse

Frequency Allocation

Ques 3. What do you mean by Handoff ?
Answer 3. When a mobile moves into a different cell while a conversation is in progress, the Mobile Switching Center automatically transfers the call to a new channel belonging to the new Base Station.
Types of handoff:-
Hard Handoff
Soft Handoff

Ques 4. Diagrammatically represent the GSM architecture ?
Answer 4. GSM architecture is as follows:-

GSM Architecture

wireless communication concept

Ques 5. What do you mean by Mobile Station Subsystem ?
Answer 5. It includes mobile equipment which refers o a physical terminal such as telephone which includes the radio trans-receiver signal processor and the Subscriber Identity Module

Ques 6. What do you mean by Base Station Subsystem ?
Answer 6. It consists of one or more BTS and BSC. Each BTS is related to one cell which includes an antenna , a video trans-receiver and a link to BSC.BSC controls multiple BTS units, manages the hand offs of the mobiles and controls paging.

Ques 7. What do you mean by Network and Switching Subsystem ?
Answer 7. It controls hand offs between cells in different BSSs, authenticates users , validates and maintains their accounts.It is mainly supported by four databases:-
1. Home Location Register.
2. Visitor Location Register.
3. Authentication Center.
4. Equipment Identity Register.

Ques 8. What do you mean by Ad-hoc networks ?
Answer 8. Ad-hoc networks are those wireless Local Area Network that do not require any infrastructure to work. Each node can communicate directly with other nodes.So, no access point is required.
Features of Ad-hoc networks are:-
1. It has high complexity.
2. It has the greatest possible flexibility.
3. It has limited range.

Ad hoc Networks

Ad hoc Networks

Ques 9. What are the different types of transmission impairment ?
Answer 9. When the received signal is not as same as the transmitted signal then it is known as Transmission impairment. Three different types of transmission impairment are:-
1. Attenuation.
2. Noise.
3. Delay Distortion.

Ques 10. What is the difference between 3G and 4G?
Answer 10. Following are the differences between 3G and 4G:-
1. 3G stands for 3rd generation as it is just that in terms of the evolutionary path of the mobile phone industry. 4G means 4th generation. This is a set of standard that is being developed as a future successor of 3G in the very near future.
2. 4G speeds are meant to exceed that of 3G.
3. 3G uses the technique of circuit switching while 4G uses the technique of packet switching.

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30 Responses to Wireless Communication concepts

  1. visagaperuman.r says:

    How does the GSM updates the location on HLR when the phone is not used

  2. visagaperuman.r says:

    How does the GSM updates the location on HLR when the phone is not used

  3. visagaperuman.r says:
  4. deepak rastogi says:

    interview questions for
    ece student

  5. deepak rastogi says:
  6. Anonymous says:
  7. Rizwan says:

    Information Services manager from a hospital has hired you as consultant to provide a wireless LAN solution for their hospital NW. The hospital employs over 800 employees, working in a complex composed of seven buildings in an urban area. All of the buildings are close enough in proximity that employees frequently walk between the buildings. The management staff wants to deploy wireless technology in their enterprise NW. They have heard that this type of They have heard that this type of NW will save them money as opposed to current leased line NW. They believe that added mobility will also dramatically increase productivity. Since the staff moves from building to building, it seems to be right idea to provide them Laptops and data that will roam with them. Plan, design and implement a wireless NW in a building in that provide
    a. Planning
    b. designing
    c. Implementation
    d. Physical lay out of equipment
    e. Cost
    f. Running annual cost
    g. Maintenance set up

  8. Rizwan says:

    Information Services manager from a hospital has hired you as consultant to provide a wireless LAN solution for their hospital NW. The hospital employs over 800 employees, working in a complex composed of seven buildings in an urban area. All of the buildings are close enough in proximity that employees frequently walk between the buildings. The management staff wants to deploy wireless technology in their enterprise NW. They have heard that this type of They have heard that this type of NW will save them money as opposed to current leased line NW. They believe that added mobility will also dramatically increase productivity. Since the staff moves from building to building, it seems to be right idea to provide them Laptops and data that will roam with them. Plan, design and implement a wireless NW in a building in that provide
    a. Planning
    b. designing
    c. Implementation
    d. Physical lay out of equipment
    e. Cost
    f. Running annual cost
    g. Maintenance set up

  9. Anonymous says:
  10. almois says:
  11. mariammal.a says:

    wireless communication interview question

  12. M.sathiyamoorthy says:

    B.E.(ECE)

  13. Jeevanmitra Giri says:

    what we call to 5G as we call 4G as LTE

  14. Jeevanmitra Giri says:
  15. Mestry MAYUR Devendra says:
  16. priya says:

    Can u plz send all interview questions for wireless communication to my email priya80269@gmail.com

  17. priya says:

    Can u plz send all interview questions for wireless communication to my email priya80269@gmail.com

  18. kokila says:

    jwireess comunication

  19. kokila says:
  20. Ekta vijay says:
  21. vetri says:

    About mobile communication basic interview question

  22. Vibha Singh says:

    Viva questions for mobile communication for final year electronics branch students

  23. subitha rani says:

    need interview questions about wireless communications

  24. sajani mendapara says:

    i need some questions with answer that degree EC engineering students are frequently asked in classroom during lectures

  25. krupa says:

    i cant understand the java and advanced java pls help me

  26. SHRUTI PRIYA says:

    A perfect article for an ENGINEERS!!!!! A short and conceptual set of questions on WIRELESS COMMUNICATIONS….. Get to know about 2G ,3G,4G,BSC,BTS…. a quick review.

  27. Debanki Mukherjee says:

    The above article is very helpful to understand a lot about wireless communications.A few more informations could be added such as IEEE wireless communications and networking communities.

  28. Barun kumar singh says:

    Nice range of question covered each and ever aspects which wireless system.Few more concepts can be added like WIFI system, WAN system .

  29. Rashmi Rani says:

    This is a brief overview of the wireless communication technology being adopted nowadays. Almost everyone linked with the technology field or those who have interest in this area must be keen to know about the latest trends in the electronics industry and one of them is the wireless technology extending to 3g and 4g schemes. These are the basic knowledge that any person should have and for any freshers with trade as ECE these are the common interview questions. we get a proper idea of wireless communication without any trouble.

  30. himanshu verma says:

    Most important and short but brief description of wireless communication.These question are important in the various Engineering related exams like gate and IES.

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