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  • RF Interview Question Answer 21-30

    Q21. How many types of TILT present in Antenna and their jobs in network coverage?
    Ans. There are two types of tilt in Antenna :
    1. Electrical Tilt- Used for adjust the beam length of antenna.
    2. Mechanical Tilt- Used for adjust the width of beam of antenna
    Q22. How many Testing Tools are used for network testing?
    Ans. There are some popular tools are used in network testing:
    1. Tems Investigation
    2. Azenqos
    3. Tems pocket
    4. Nemo
    5. XCALL etc.
    Q23. How many different-2 types of testing doing for network testing?
    Ans. There are two types of testing in site
    (i) Drive Test
        1. SCFT (Single Cell Functionality Testing)
        2. Cluster Drive Testing
    (ii) Survey testing.
    (iii) Banchmark testing.
    (iv) optimisation testing

    Q24. What is call initiation (connect) duration of CSFB and Volte?
    Ans. The mo-call initiation duration in CSFB is less than 4sec, and Volte should be less than 1ms.

    Q25. What is Microwave? Why it is used in network?
    Ans. Microwave is the equipment used in a tower to make a wireless link with another tower and its a wireless connectivity between two eNBs.Microwave is the transmission of information by microwave radio waves.Its work on line of sight principle and point to point communication because their small wavelength. The bandwidth of microwave is between 3 to 30GHz.and modulation is 1024 QAM to 2048QAM.

    Q26. How to check microwave visibility? And what is hop-to-hop?
    Ans. We are using some visibility check tools for checking two microwave visibility in a clutter area.
    Hop-by-hop transport is a principle of controlling the flow of data in a network. With hop-by-hop transport, chunks of data are forwarded from node to node in a store and forward manner.
    As hop-by-hop transport involves not only the source and destination node, but rather some or all of the intermediate nodes as well, it allows data to be forwarded even if the path between source and destination is not permanently connected during communication.
    Q27. How to reduce interference in LTE?
    Ans. when same freq superimposed each other and totally corrupt the data signal waves.
    The interference could be reduce only by proper optimisation of near and far sites. There are few points:
    1. Azimuth should be designed as per site clutter.
    2. Electrical tilt should be perfect in site and nearby sites also.
    3. Mechanical tilt should be perfect.
    4. Check swap in sites.
    5. Check blockage in sectors.
    6. And check PCI collision.
    Q28. What is difference between db power and dbm power?
    Ans. dB and dBm are common terms used when discussing cellular signal strength and signal amplifier systems. But what exactly do these terms mean?
    dbm Decibels milliwatts or the amount of power an amplifier or antenna can produce or how much signal is at a site. It is an important measure when determining signal strength at a site. A strong signal is usually around -70dBm or higher where a weak signal is around -100dBm or lower.
    dB – Decibel or a relative number signifying the amount of increase or decrease in signal. This is helpful when determining the amount of signal strength of a particular amplifier system and how much signal will be present when the system is installed. This can be determined by adding the signal strength of a site plus the amount of gain or dB from an amplifier. This will give the overall indoor cellular strength.

    Q29. What is ping? And Latency required in LTE?
    Ans. Packet InterNet Groper (PING). A ping is nothing but a time duration of server response. Latency. In LTE ping duration should be less than 30ms.

    Q30. What is KPI?
    Ans. key performance indicator (KPI), it is used to check the performance of site radio conditions.
    KPI is divided into 6 main parts 1. Accessbility, 2. Integrity, 3. Mobility, 4. Retainability, 5. Availability and 6. Utilization.
    The purpose is to check the performance of Network. In the Optimization process we have to check the KPI value to monitor and optimize the radio network performance in order to provide better subscriber quality or to achieve better utilization of available radio network resources.


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