3G Radio n/w optimization Flashcards
one key issue in UMTS coverage and capacity planning is
1) site configuration
2) traffic level
3) coverage area
traffic level
Even after careful RF planning, the first step of optimization should concentrate on _____
1) RF optimization
2) voice optimization
3) service optimization
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.
Service optimization steps are
1. RF optimization
2. _______
3. _______
4. _______
- RF optimization
- Voice optimization
- Advance services optimization (CS and PS service) [circuit switched, packet switched]
- Inter-system (also known as inter-RAT) change (both reselection and handover) optimization [optional]
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
resource availability
_______ 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
channel switching
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
rate switching
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
type switching
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
PS domain [packet switching]
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
increase the subscriber experience while using a given application
(not for 1 or 2)
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
all the above
optimization challenges for WCDMA cell sites
1) traffic load balancing
2) handoff overhead management
3) interference control
4) all the above
all the above
traffic load balancing can be done by
1) modifying the antenna orientation
2) modifying angular beam width of each sector
3) both
both
modifying angular beam width of each sector is done by ________ type of antenna
1) Cassegrain
2) smart array
3) isotropic
smart array antennas
Handoff zones should be shifted from ____ to _____
1) high-traffic areas to low-traffic
areas
2) low-traffic areas to high-traffic
areas
high-traffic areas to low-traffic
areas
____ 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
Pilot pollution
Inter-RAT stands for
INTER RADIO ACCESS TECHNOLOGY
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
RNC
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’
‘Inter-RAT In BSC Handover Enable’ parameter
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)
0 to -7 Good
-7 to -10 Acceptable
-10 to -36 Bad
Received signal Code Power CPICH RSCP ranges
(range within: -140 to -30)
-30 to -75 Good
-75 to -85 Acceptable
-85 to -140 Bad
Tx Power is the power of a mobile station measured in the ________ mode
1) dedicated
2) isolated
3) connected
dedicated
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
-50 to 50
______ 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
RSSI
RSCP stands for
Received signal Code Power
RSSI stands for
Received Signal Strength Indicator
Choose the correct
1) RSCP = RSSI + Ec/No
2) RSSI= RSCP + Ec/No
3) RSCP = RSSI - Ec/No
4) RSSI= RSCP - Ec/No
RSSI= RSCP + Ec/No
Received Signal Strength Indicator (RSSI) Ranges
(range within: -140 to 0)
0 to -75 Good
-75 to -85 Acceptable
-85 to -140 Bad
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
RSCP
DPCC stands for
Dedicated Physical control
channel
SIR ratio stands for
Signal to Interference ratio
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
SIR ratio
SQI stands for
speech quality index
parameter to rate the voice quality on that particular call
1) SIR
2) SQI
SQI (speech quality index)
It ranges from 0 to 30. While 30 being the Best Value
SQI (speech quality index) value ranges from ___ to _____
1) -10 to 10
2) 0 to 10
3) 0 to 30
4) 10 to 30
It ranges from 0 to 30. While 30 being the Best Value
_______ is also used to enhance the speech or the voice quality of the specific call
1) QAM
2) AMR
3) PSK
Adaptive Multi Rate (AMR).
WCDMA use AMR source Coding.
Highest AMR Value is
1) 10.5
2) 12.2
3) 15.0
4) 16.7
12.20
Lowest AMR value is
1) 0.0
2) 2.72
3) 4.75
4) 5.25
4.75
It tells the current state and channel as in idle or dedicated.
1) DPCC
2) RRC
3) SIR
4) SQI
RRC state
(Radio Resource Control)
RRC stands for
Radio Resource Control
Cell Name is specific name of
1) NodeB
2) BSS
3) Sector
NodeB
_____ Codes are usually used to identify different cells of a node B
1) Modulation codes
2) Scrambling codes
3) Multiplexing codes
Scrambling Codes
________ are used in Beam forming cases.
1) Primary Scrambling Code
2) Secondary Scrambling Code
Secondary Scrambling Code
_______ are used to identify different sectors
1) Primary Scrambling Code
2) Secondary Scrambling Code
Primary Scrambling Code
Total downlink scrambling codes
1) 256
2) 512
3) 1024
4) 8092
512
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
AS (Active Set)
There can be at least maximum ____ scrambling’s codes in an Active Set.
1) 2
2) 3
3) 4
4) 5
3 scrambling’s codes
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
MN (Monitored Neighbour)
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
Detected Neighbour
(cells detected by UE, which are neither in the Active set nor in the
Monitored set.)
