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Drops & Quality RFM
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Transcript of Drops & Quality RFM
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Dropped Calls&Call Quality
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Agenda
Review dedicated channel operations SHO, BLER
Outline factors that can cause dropped calls
Illustrate the modes of failure and outline themethods of resolving dropped calls usingexamples
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W-CDMA Dropped Call Performance
Objectives Maximize call retention
Balance resource utilization with retainability
Inputs Mobile Drive Test Data long calls
System Statistics (mature network)
Tasks Characterize failures
Identify Performance impacting parameters andactions to resolve drops
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Dedicated
ChannelOperations
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Downlink BLER
Quality Target set for Signaling Radio Bearer
Each of the 3 AMR 12.2 Transport Channels
BLER Reports from UE Signaling Radio Bearer
First (A-bits) of the 3 speech Transport Channels
0.1*QualityTarget = LOG10(DesiredBLER)
If 2% is desired, Configure -1710(-1.7) = 0.02
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Z
Soft Handover Behavior
UE
A
D
Active Set
Monitoring Set
B C
E
F
Detected Set
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Soft Handover AlgorithmExample
Time
MeasurementQuantity P CPICH 1
P CPICH 2
P CPICH 3
T
H1a
Event 1A
= add cell 2
H1c
T
Event 1C
= replace cell1with cell3
H1b
T
Event 1B
= removecell3
H: Hysteresis
T: Time-to-trigger
ReportingRange
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Soft Handover AlgorithmExample (continued)
Time
MeasurementQuantity P CPICH 1
P CPICH 2
P CPICH 3
T
H1a
Event 1A
= add cell 2
H1c
T
Event 1C
= replace cell1with cell3
H1b
T
Event 1B
= removecell3
H: Hysteresis
T: Time-to-trigger
ReportingRange
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Active Set Management
RNCNode B
CN PSTN
UE
Iub IuUu
Measurement Report
Active Set Update
Active Set Update Complete
Setup and Add Radio Link
UTRAN informs UE of radiolinks added and/or deletedfrom the active set. Mayinclude reconfiguration ofRadio Bearer
Measurement Control
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ParameterSummary
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Parameter OverviewParameter Notes
e1a reporting range Triggered when a monitored CPICH Ec/No is measured withinX db of the strongest pilot in the active set
e1b reporting rangeTriggered when a monitored CPICH Ec/No is measured more
than X db less than the strongest pilot in the active set
e1c hysteresisTriggered when a monitored CPICH Ec/No is measured within
X db of any pilot in the active set
e1d reporting range
Triggered when the strongest pilot in the active set changes
new strongest pilot must be X db stronger prior to triggering
event 1d
Time to TriggerValue, typically in milliseconds, for which a condition must exist
prior to an event being triggered and sent to the UTRANNeighbor list List of cells to monitor
Periodic interval For periodic measurements, reporting interval
BLER TargetsUsed for outer loop power control, set for each transport
channel
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Summary
Courses of action BLER
Power allocation
Init power (for access) Relax sho
Coverage/NL
Tying it All Together Discussion: zeroing in on problem areas
Drive testing (scanner + calls)
Network Performance Stats (per cell failures)