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LDCE Wireless > 3G Radio n/w optimization > Flashcards

3G Radio n/w optimization Flashcards

1
Q

one key issue in UMTS coverage and capacity planning is
1) site configuration
2) traffic level
3) coverage area

A

traffic level

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2
Q

Even after careful RF planning, the first step of optimization should concentrate on _____
1) RF optimization
2) voice optimization
3) service optimization

A

RF optimization
This is necessary as RF propagation is affected by so many factors (e.g., buildings, terrain, vegetation…) that propagation models are never fully accurate.

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3
Q

Service optimization steps are
1. RF optimization
2. _______
3. _______
4. _______

A
  1. RF optimization
  2. Voice optimization
  3. Advance services optimization (CS and PS service) [circuit switched, packet switched]
  4. Inter-system (also known as inter-RAT) change (both reselection and handover) optimization [optional]
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4
Q

Either for access or for handover, the main difference between voice and other service is the _________
1) Noise spectral density
2) resource availability
3) reselection parameters

A

resource availability

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5
Q

_______ is a generic term referring to the capability of the network to change the PS data bearer to a different data rate (rate switching) or a different state (type switching)
1) circuit switching
2) channel switching

A

channel switching

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6
Q

the capability of the network to change the PS data bearer to a different data rate
1) rate switching
2) type switching
3) circuit switching
4) state switching

A

rate switching

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7
Q

the capability of the network to change the PS data bearer to a different state
1) rate switching
2) type switching
3) circuit switching
4) state switching

A

type switching

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8
Q

Application optimization can be seen as a final touch of service optimization and is typically limited to the ___ domain
1) PS domain
2) CS domain

A

PS domain [packet switching]

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9
Q

During application optimization system parameters are optimized for
1) highest throughput
2) lowest delay
3) increase the subscriber experience while using a given application
4) All the above

A

increase the subscriber experience while using a given application
(not for 1 or 2)

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10
Q

During application optimization, (Irrespective of the application considered) the main controls available to the optimization
engineer is/are
1) RLC parameters
2) target quality
3) channel switching parameters
4) all the above

A

all the above

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11
Q

optimization challenges for WCDMA cell sites
1) traffic load balancing
2) handoff overhead management
3) interference control
4) all the above

A

all the above

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12
Q

traffic load balancing can be done by
1) modifying the antenna orientation
2) modifying angular beam width of each sector
3) both

A

both

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13
Q

modifying angular beam width of each sector is done by ________ type of antenna
1) Cassegrain
2) smart array
3) isotropic

A

smart array antennas

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14
Q

Handoff zones should be shifted from ____ to _____
1) high-traffic areas to low-traffic
areas
2) low-traffic areas to high-traffic
areas

A

high-traffic areas to low-traffic
areas

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15
Q

____ pollution is often caused due to high elevation sites with RF coverage footprints much larger than normal.
1) Carrier pollution
2) Pilot pollution
3) RF pollution

A

Pilot pollution

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16
Q

Inter-RAT stands for

A

INTER RADIO ACCESS TECHNOLOGY

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17
Q

Inter-RAT handover from UMTS cell to a GSM cell. The handover decision and handover procedure are controlled by the _____
1) eNOdeB
2) RNC
3) MSC

A

RNC

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18
Q

If ___________ parameter is set to No, the BSS rejects all the requests for the handover from UMTS to GSM and also GSM to UMTS (does not select a
UMTS cell as the target cell)
1) ‘Intra-RAT In BSC Handover Enable’
2) ‘Inter-RAT In BSC Handover Enable’
3) ‘GSM-UMTS in BSC Handover Enable’

A

‘Inter-RAT In BSC Handover Enable’ parameter

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19
Q

ratio of the energy of the chip and the combined power of all the signals including the specific pilot channel.
CPICH Ec/No ranges
(range within: -36 to 0)

A

0 to -7 Good
-7 to -10 Acceptable
-10 to -36 Bad

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20
Q

Received signal Code Power CPICH RSCP ranges
(range within: -140 to -30)

A

-30 to -75 Good
-75 to -85 Acceptable
-85 to -140 Bad

20
Q

Tx Power is the power of a mobile station measured in the ________ mode
1) dedicated
2) isolated
3) connected

A

dedicated

21
Q

Tx Power is the transmitting power of the mobile station. Its value can vary from ___ to ___
1) -10 to 10
2) -25 to 25
3) -50 to 50
4) -100 to 100

A

-50 to 50

22
Q

______ is the total power of the entire common pilot channel received by the Mobile station Including Neighbors interference and noise as well as neighbors and itself also
1) RSCP
2) RSSI

A

RSSI

23
Q

RSCP stands for

A

Received signal Code Power

24
Q

RSSI stands for

A

Received Signal Strength Indicator

25
Q

Choose the correct
1) RSCP = RSSI + Ec/No
2) RSSI= RSCP + Ec/No
3) RSCP = RSSI - Ec/No
4) RSSI= RSCP - Ec/No

A

RSSI= RSCP + Ec/No

26
Q

Received Signal Strength Indicator (RSSI) Ranges
(range within: -140 to 0)

A

0 to -75 Good
-75 to -85 Acceptable
-85 to -140 Bad

27
Q

the level of the signal received by the U.E. (or in simple the total power of the entire cell or a specific Common Pilot Channel received by U.E)
1) RSCP
2) RSSI

A

RSCP

28
Q

DPCC stands for

A

Dedicated Physical control
channel

29
Q

SIR ratio stands for

A

Signal to Interference ratio

30
Q

ratio of energy in the DPCC (Dedicated Physical control channel) to that of the interference and noise received by the User Equipment
1) VSWR
2) SNR
3) SIR
4) SQI

A

SIR ratio

31
Q

SQI stands for

A

speech quality index

32
Q

parameter to rate the voice quality on that particular call
1) SIR
2) SQI

A

SQI (speech quality index)
It ranges from 0 to 30. While 30 being the Best Value

33
Q

SQI (speech quality index) value ranges from ___ to _____
1) -10 to 10
2) 0 to 10
3) 0 to 30
4) 10 to 30

A

It ranges from 0 to 30. While 30 being the Best Value

34
Q

_______ is also used to enhance the speech or the voice quality of the specific call
1) QAM
2) AMR
3) PSK

A

Adaptive Multi Rate (AMR).
WCDMA use AMR source Coding.

35
Q

Highest AMR Value is
1) 10.5
2) 12.2
3) 15.0
4) 16.7

A

12.20

36
Q

Lowest AMR value is
1) 0.0
2) 2.72
3) 4.75
4) 5.25

A

4.75

37
Q

It tells the current state and channel as in idle or dedicated.
1) DPCC
2) RRC
3) SIR
4) SQI

A

RRC state
(Radio Resource Control)

38
Q

RRC stands for

A

Radio Resource Control

39
Q

Cell Name is specific name of
1) NodeB
2) BSS
3) Sector

A

NodeB

40
Q

_____ Codes are usually used to identify different cells of a node B
1) Modulation codes
2) Scrambling codes
3) Multiplexing codes

A

Scrambling Codes

41
Q

________ are used in Beam forming cases.
1) Primary Scrambling Code
2) Secondary Scrambling Code

A

Secondary Scrambling Code

42
Q

_______ are used to identify different sectors
1) Primary Scrambling Code
2) Secondary Scrambling Code

A

Primary Scrambling Code

43
Q

Total downlink scrambling codes
1) 256
2) 512
3) 1024
4) 8092

A

512

44
Q

Set of scrambling codes on which the user equipment is currently latched on is termed as _________
1) Active code
2) Active set
3) Latched code
4) Latched set

A

AS (Active Set)

45
Q

There can be at least maximum ____ scrambling’s codes in an Active Set.
1) 2
2) 3
3) 4
4) 5

A

3 scrambling’s codes

46
Q

Neighbor cell that is detected by user equipment as a neighbor is termed as _________
1) cell neighbour
1) monitored neighbour
1) nearby neighbour
1) detected neighbour

A

MN (Monitored Neighbour)

47
Q

It is very important to optimize a network and have no DN’s as they are one of the major reasons of call drops in 3G. DN referes to
1) Deleted Neighbour
2) Detected Neighbour

A

Detected Neighbour
(cells detected by UE, which are neither in the Active set nor in the
Monitored set.)

LDCE Wireless (15 decks)

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