GSM And CDMA: Radio Networks Design! Trivia Knowledge Quiz

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GSM And CDMA: Radio Networks Design! Trivia Knowledge Quiz

Below is a Gsm And Cdma: Radio Networks Design trivia quiz that is designed to see just how attentive you have been in class with regards to this topic. It covers some of the basic facts you should know before this week’s exam. Do give it a try and keep a lookout for other quizzes just like it. All the best!


Questions and Answers
  • 1. 
    • A. 

      WCDMA & CDMA fast power control provides provides a diversity gain .

    • B. 

      Cross polar antennas are necessary for Tx/Rx diversity to work .

    • C. 

      Wide transmission can provide a diversity gain .

    • D. 

      Interleaving of data bits can provide a diversity gain .

    • E. 

      Soft HO can results in a macro-diversity gain .

  • 2. 
    What are 2 characteristics about multipath reflections in WCDMA & CDMA2000 systems? (choose two)
    • A. 

      Increases thermal noise at base station receiver .

    • B. 

      Provide additional diversity .

    • C. 

      Causes fast fadding of received signal .

    • D. 

      Requires additional channel elements .

  • 3. 
    Reffering to the exibhits, what are 2 results of downtilting a directional antenna using machanical tilt? (choose 2)
    • A. 

      Backlobe (Lobe C) is uptilted .

    • B. 

      Backlobe (Lobe C) is downtilted .

    • C. 

      Sidelobes (Lobe B) are downtilted .

    • D. 

      Sidelobes (Lobe B) are maintained.

  • 4. 
    A base station has a radiated power of 100 W .What are the 2 equivalent powers expressed in dB units ? (Choose 2)
    • A. 

      10 dBW

    • B. 

      50 dBm

    • C. 

      20 dBW

    • D. 

      20 dBc

  • 5. 
    An over shooter is detected within a cluster .Which 2 actions would be taken to reduce the negative effect? (Choose 2)
    • A. 

      Increase the electrical downtilt .

    • B. 

      Decrease the machanical downtilt .

    • C. 

      Change the antenna azimuth .

    • D. 

      Verify base station alarms .

  • 6. 
    Which 2 statements describe a Remote Radio Unit (RRU) ? (Choose 2)
    • A. 

      A module used to increse radio channel element capacity .

    • B. 

      A Diplexer used for dual band antennas .

    • C. 

      A transmitter and receiver installed close to the antenna to reduce feeder loss .

    • D. 

      A solution to increase coverage .

  • 7. 
    When performing capacity dimensioning, what are three considerations? ( Choose 2) 
    • A. 

      Number of subscribers

    • B. 

      Mobile transmitter power

    • C. 

      Available spactrum

    • D. 

      Antenna Gain

    • E. 

      Number of carriers per cell

  • 8. 
    • A. 

      Receiver blocking interference

    • B. 

      Intermodulation interference

    • C. 

      Out of band emission interference

    • D. 

      External interference

  • 9. 
    Which 3 component are used for propogation model tuning? (Choose 3)
    • A. 

      GPS

    • B. 

      Network timing advance trace

    • C. 

      CW transmitter

    • D. 

      Mobile phone

    • E. 

      Radio receiver

  • 10. 
    What defines the downlink footprint of the following technologies ? ( Note : RS= Reference Signal)    1    GSM2    WCDMA3    LTE
    • A. 

      1. RS; 2. CPICH ; 3. BCCH

    • B. 

      1.RS; 2.BCCH; 3.CPICH

    • C. 

      1. BCCH ; 2. CPICH ; 3. RS

    • D. 

      1.CPICH; 2. BCCH; 3. RS

  • 11. 
    Which statement describes pole capacity in WCDMA or CDMA200 systems?
    • A. 

      The loading at which the number of users is 75% of the maximum system capasity .

    • B. 

      A theoretical capacity determined by the base station transmitter power.

    • C. 

      A theoretical capacity at which the base station receiver noise rise is infinite .

    • D. 

      The maximum number of user that can be connected to the system .

  • 12. 
    The out of band emmision level for a base station transmitter is flat across a frequency range of 500 MHz and is measured at -50 dBm per 100 kHz. What is the power of the out-of-band emission in a 1 MHz bandwidth ?                    
    • A. 

      -47 dBm

    • B. 

      -60 dBm

    • C. 

      -50 dBm

    • D. 

      -40 dBm

  • 13. 
    Which statement is describes Link Adaptation ?
    • A. 

      It is a special class of modulation-coding schemes used for high rate data transmission to combat multipath .

    • B. 

      It is a method of adjusting CQI values to combat radio channel impairments such as multipath, fading & interference .

    • C. 

      It is a technique for maximizing received signal powers for high rate data transmissions .

    • D. 

      It is a method for matching transmitter characteristics such as modulation and coding to instantaneous radio channel conditions .

  • 14. 
    Which 2 RF devices would be used to combine signals to and from two different base     stations onto a single antenna ? ( choose 2)    
    • A. 

      Hybrid ring combiner

    • B. 

      Connector

    • C. 

      Filter combiner

    • D. 

      Air combining

  • 15. 
    Shadowing (log-normal fading) is due to which machanism
    • A. 

      Obstruction of signal by obstacles near the terminal

    • B. 

      Multipath reflection off nearby buildings

    • C. 

      Earth curvature effect

    • D. 

      Ground reflections

  • 16. 
    Which statement describes intra LTE handover Event A3 ?
    • A. 

      The server becomes offset better then the neighbor .

    • B. 

      The server becomes better then the neighbor .

    • C. 

      The neighbor becomes better than serving .

    • D. 

      The neighbor becomes offset better then serving .

  • 17. 
    You re-tune BCCH frequencies with a frequency planning tool .    What must be verified after completing this process?    
    • A. 

      BSIC

    • B. 

      LAC

    • C. 

      MAIO

    • D. 

      Coverage

  • 18. 
    A spectrum analyzer measures 10 dBm in a measurement bandwidth of 50 KHz . The Signal spectral density is constant over the transmitter BW of 500 KHz .    What is the total transmitted power in the transmitter BW ?    
    • A. 

      20 dBm

    • B. 

      40 dBm

    • C. 

      30 dBm

    • D. 

      10 dBm

  • 19. 
    Which 2 statement apply for WCDMA soft Handover? (Choose 2)
    • A. 

      If suitable SHO cell fails to be added to the active set, the call will drop .

    • B. 

      If a new candidate cell is detected for SHO, the UE sends a RACH transmission to the cell to setup the link .

    • C. 

      SHO can only be performed between cells using the same carrier frequency .

    • D. 

      Cell in active set are always in SHO .

  • 20. 
    Which 3 elements determine the accuracy of predictions ? (Choose three)
    • A. 

      Updated traffic data .

    • B. 

      Correct digital terrain map .

    • C. 

      Calibrated propogation model

    • D. 

      Correct number of cell transmitters .

    • E. 

      Correct EIRP

  • 21. 
    Which statement correctly describes HARQ with soft combining as used in WCDMA ?
    • A. 

      One or more transmission of a packet are used until the packet can be successfully decoded

    • B. 

      It is the way of minimizing signal to noise(SNR) ratios when receiving multiple signals

    • C. 

      It is a adeptive rate query scheme used for link adaption in soft handover .

    • D. 

      It is a modulation scheme that allow data rates to be achived .

  • 22. 
    • A. 

      The type of antenna .

    • B. 

      The type of enviroment

    • C. 

      The type of reference coordinate system

    • D. 

      The type of traffic data

  • 23. 
    In a new radio N/W, which 3 KPIs are commonly used during the initial tuning process to evaluate the packet switched (PS) performance for the acceptance cluster ?    
    • A. 

      Drop call rate

    • B. 

      Uplink & downlink throughput

    • C. 

      Busy hour traffic

    • D. 

      Daily traffic

    • E. 

      Call setup success rate

  • 24. 
    Regarding WCDMA Link Budgets, what is the purpose of Eb/No ?
    • A. 

      It sets the base station or mobile terminal receiver sensitivities .

    • B. 

      It defines the base station or mobile station receiver noise figures .

    • C. 

      It determines the coding rate & throughputs used for link adaptation .

    • D. 

      It ensure that the base station or mobile terminal transmitter power do not exceed legal limits .

  • 25. 
    Which interface is used in WCDMA by users euipment (UE) to commuticate with a radio base station?
    • A. 

      Gn

    • B. 

      Uu

    • C. 

      Iub

    • D. 

      Iur

  • 26. 
    Which 2 statement are correct about an Urban site design? (choose 2)
    • A. 

      Directional antennas are not used

    • B. 

      Generally, remote radio units reduce feeder losses .

    • C. 

      Extended range cells are used .

    • D. 

      Cross polar antennas provide suffucient diversity .

  • 27. 
    You have an LTE urban N/W environment with an inter-site distance of 300 meters and tri-sector sites. Which commercial horizontal beam-width antenna would you use to reduse interference between Co-located cells?    
    • A. 

      Horizontal beam width = 10º

    • B. 

      Horizontal beam width = 65º

    • C. 

      Horizontal beam width = 120º

    • D. 

      Horizontal beam width = 90º

  • 28. 
    • A. 

      Provide an estimation based on planning tool results, using analytical studies .

    • B. 

      Provide an estimation based on link budget analysis .

    • C. 

      Provide an estimation based on planning tool results, using Monte Carlo simulation.

    • D. 

      Provide an estiamtion based on RF optimization results, using site selection capabilities .

  • 29. 
    Which 3 maps types are used as input to propagation prediction tools for use in RF & Monte Carlo Predetion? (choose 3)    
    • A. 

      Traffic distribution map

    • B. 

      Elevation map

    • C. 

      Satellite photograph map .

    • D. 

      Noise rise map

    • E. 

      Clutter type (environment) map

  • 30. 
    Which statement describes noise figure(NF) ?
    • A. 

      A parameter in the base station that is used for UL power control .

    • B. 

      The improvement in the SNR caused by active or passive RF system components .

    • C. 

      The UL coverage improvemant when using a tower mounted amplifier.

    • D. 

      The degradation in the signal-To-Noise ratio (SNR) caused by active or passive RF system components .

  • 31. 
    Which action should be taken to improve the accuracy of propogation model ?
    • A. 

      Change the antenna height

    • B. 

      Adjust the downlink powers of cells

    • C. 

      Perform a drive test using a scanner .

    • D. 

      Reduce the log normal fading margin .

  • 32. 
    Which combination of elements are interconnected by the interface S1 in LTE N/W ?
    • A. 

      UE with MME

    • B. 

      ENB with eNb

    • C. 

      ENB with MME

    • D. 

      ENB with UE

  • 33. 
    UMTS Monte Carlo simulation shows that a certain cell is overloaded (DL Load = 100%)  with low DL interference . what would you do resolve the problem ?    
    • A. 

      Increase the number of scrambling codes .

    • B. 

      Increase power amplifier (PA) output power .

    • C. 

      Increase BW by 1 MHz.

    • D. 

      Disable soft handover (SHO).

  • 34. 
    Which KPI should be used to identify issue in a cell during the call establishment procedure . 
    • A. 

      Soft handover success rartio .

    • B. 

      Minutes per drop .

    • C. 

      Call setup Succes Rate (CSSR) .

    • D. 

      Drop Call rate.

  • 35. 
    • A. 

      (-96) dBm

    • B. 

      (-98) dBm

    • C. 

      (-120) dBm

    • D. 

      (-100) dBm

  • 36. 
    • A. 

      The amplifire should be placed just after the feeder cable (location B)

    • B. 

      The amplifier should be placed just after the antenna (location A)

    • C. 

      The amplifire should be placed just after the base station receiver (Location C)

    • D. 

      If a TMA is used, it does not matter where the amplifier is palced .

  • 37. 
    The exhibit shows a base station to mobile terminal system and a corresponding link budget .What is the path loss(X) so that the link budget is correct ?    
    • A. 

      95 dB

    • B. 

      90 dB

    • C. 

      105 dB

    • D. 

      100 dB

  • 38. 
    Which 2 duplex technique are used in LTE ? (Choose 2)
    • A. 

      FDD

    • B. 

      TDMA

    • C. 

      OFDMA

    • D. 

      TDD

  • 39. 
    Which 2 actions will improve dominance? (choose 2)
    • A. 

      Change antenna tilts

    • B. 

      Add tower mounted amplifire

    • C. 

      Add a new site in the area

    • D. 

      Add another carrier frequency to each site .

  • 40. 
    What is the correct sequence of task in a WCDMA network design .
    • A. 

      Coverage prediction, radio N/W link budget, Monte Carlo analysis, initial tuning & neighbor planning.

    • B. 

      Radio N/W link budget, Coverage prediction, Monte Carlo analysis, neighbor planning.& initial tuning

    • C. 

      Radio N/W link budget, Coverage prediction, Monte Carlo analysis, initial tuning neighbor planning.

    • D. 

      Radio N/W link budget, Monte Carlo analysis, Coverage prediction, neighbor planning. & initial tuning

  • 41. 
    Which statement is correct for BSIC ?
    • A. 

      BSIC does not depends on frequency plan.

    • B. 

      BSIC is a combination of NCC & BCC

    • C. 

      BSIC depends directly on the BCCH that is used .

    • D. 

      BSIC depends on the hopping type .

  • 42. 
    What is the purpose of a splitter ?
    • A. 

      To amplify the signal by 3 dB,

    • B. 

      To provide a final element in a transmit chain

    • C. 

      To distribute the signal with equal power distribution ,

    • D. 

      To improve gain

  • 43. 
    Which 2 would effect the path loss predicted by the Okumura-Hata propogation model? (choose 2)
    • A. 

      A change in the distance between tranmitter & receiver

    • B. 

      A change in the transmitted power

    • C. 

      A change in the frequency band

    • D. 

      A change in the antenna tilt.

  • 44. 
    What is the purpose of tower mounted amplifier ?
    • A. 

      To improve the DL performance of a base station, especially if feeder losses are high

    • B. 

      To overcome inter modulation interference issues in co-sited base station

    • C. 

      To improve the sensivity of a base station receiver system, especially if feeder losses are high

    • D. 

      To assist with DL power control for a base station transreceiver

  • 45. 
    GSM Which 3 inputs are required when making an initial GSM coverage prediction? (choose 3)
    • A. 

      Sector O/P power

    • B. 

      Vector Map

    • C. 

      Terrain elevation map

    • D. 

      BCCH frequency of the setor

    • E. 

      Position of the sectors (latitude/longitude)

  • 46. 
    When using a planning tool for LTE design, what are 2 O/P plots ? (choose 2)
    • A. 

      A signal to interference-plus-noise ratio(SINR) plot

    • B. 

      A soft HO state plot

    • C. 

      A receive signal reference power (RSRP) plot

    • D. 

      A received signal code power (RSCP) plot

  • 47. 
    Which statement would be correct about an antenna with 65 degree horizontal beamwidth and a gain of 15 dBi?    
    • A. 

      The gain is approximately 12 dBi at horizontal angles of 30 and -30 degrees from the direction of maximum gain.

    • B. 

      The gain is approximately 9 dBi at horizontal angles of 30 and -30 degrees from the direction of maximum gain.

    • C. 

      The gain is approximately 12 dBi at horizontal angles of 60 and -60 degrees from the direction of maximum gain.

    • D. 

      The gain is approximately 9 dBi at horizontal angles of 60 and -60 degrees from the direction of maximum gain.

  • 48. 
    Which 3 frequency Bands are used by WCDMA (UMTS) technology ? (Choose 3)
    • A. 

      900 MHz

    • B. 

      1900 MHz

    • C. 

      700 MHz

    • D. 

      2100 MHz

    • E. 

      5.4 Ghz

  • 49. 
    Which 3 elements are used to characterize a mobile radio channel ? (choose 3)
    • A. 

      Slow fading

    • B. 

      Path loss

    • C. 

      Mobile speed

    • D. 

      Mobile category

    • E. 

      Base station power

  • 50. 
    A base station transmitter has a total output power of 40 W. A pilot channel is set to a level equal to 10% of the total base station transmitter output power. What is the transmitted power of the pilot channel?    
    • A. 

      40 dBm

    • B. 

      33 dBm

    • C. 

      36 dBm

    • D. 

      46 dBm

  • 51. 
    What does this image show?
    • A. 

      space diversity

    • B. 

      Field component diversity

    • C. 

      Polarization diversity

    • D. 

      Frequency diversity

  • 52. 
    Which 2 statements are correct regarding SHO in WCDMA or CDMA2000 network ? (Choose 2)
    • A. 

      Mobile phone can measure more then 1 cell in idle mode .

    • B. 

      Mobile phones can simultaneously connect to more then one radio links .

    • C. 

      Mobile phones can combine multiple links a RAKE receiver .

    • D. 

      Mobile phones can simultaniously connect to two carrier frequencies .

  • 53. 
    For a fixed physical sized antenna,  what are two differences in characteristics between high frequency and lower frequency patterns? (Choose two.)    
    • A. 

      Vertical beam width is larger for higher frequency.

    • B. 

      Vertical beam width is smaller for higher frequency.

    • C. 

      Antenna gain is lower for higher frequency.

    • D. 

      Antenna gain is higher for higher frequency.

  • 54. 
    • A. 

      40 W

    • B. 

      20 W

    • C. 

      15 W

    • D. 

      30 W

  • 55. 
    Which statement describes how the selection of the feeder cable type would be used to reduce the transmission loss between a base station and an antenna?    
    • A. 

      Larger diameter cables have lower transmission loss per meter.

    • B. 

      Flexible coaxial cables can be easily installed into small spaces.

    • C. 

      Smaller diameter cables have a smaller bending radius and are easier to install.

    • D. 

      Radiating coaxial cables allow for the gradual release of signals over the length of the cable.

  • 56. 
    Coverage and capacity design is required for a new WCDMA network in a city. Which three elements influence the number of required sites? (Choose three.)    
    • A. 

      site configuration

    • B. 

      traffic demand

    • C. 

      Scrambling code plan

    • D. 

      frequency band

    • E. 

      number of neighbors per cell

  • 57. 
    Which statement is correct about the idle mode cell reselection behavior of an LTE UE?
    • A. 

      It selects the strongest cell RSRP to ensure that the best cell is used for making calls.  

    • B. 

      It uses the quality of the BCCH channel to determine the best cell. 

    • C. 

      It uses RACH transmissions to determine which cell is the best cell for making calls.

    • D. 

      It selects the serving cell based on a ranking using RSRP measurements, offset, and hysteresis parameters. 

  • 58. 
    What is the 10 K Value of VSWR :
    • A. 

      1.1

    • B. 

      1

    • C. 

      2

    • D. 

      Infinity

  • 59. 
    The exhibit shows a base station using rate 1/2 convolutional coding and 64-QAM modulation. For an input data rate of 10 kbps (location A), what is the symbol rate in kilo symbols per second  (ksps) at the output of the modulator (location B)?
    • A. 

      30

    • B. 

      48

    • C. 

      120

    • D. 

      320

  • 60. 
    What accurately the soft HO process used by CDMA2000 & WCDMA technologies ?
    • A. 

      Inter radio access technology (IRAT) session continuity

    • B. 

      Inter radio access technology (IRAT) handover

    • C. 

      Break before make handover

    • D. 

      Make before break handover