Post on 01-Jun-2018
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8/9/2019 3G Nokia Siemens Document
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For internal use
Decision criteria
Accesibility < 99%
Cell OK
No
Yes
Additional KPI check & optimization (if necessary)
• AMR accessibility
• PS R99 accessibility
• HSPA accessibility
Radio
resourcesChannel
elements
Transport
resources
RNC internal
resources
Lack of
Radio Resoures
Lack of
Channel Elements
Lack of
Iub resourcesLack of
RNC resources
Failures due toAC >1%
Failures due toBTS >1%
Failures due toTRANS >1%
Failures due toRNC >1%
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RAB setup failures1. Admission Control (AC) failures – RADIO
• Indicates lack of radio resources: – DL power
▪ Measurement of PtxTotal, transmission power of NonHSDPA, HSDPA etc.
– UL interference
▪ Measurement of RSSI
▪ Measurement of PrxTotal and PrxNoise
– DL channelization codes:
▪ Channelization code occupancy (min, max, avg)
▪ Channelization code blocking rate
▪ HSDPA code usage
▪ HSDPA code downgrades
– Rejection rate in downlink and uplink (SRB, AMR, CS data, PS data)due to congestion
– Common channel load (RACH, FACH, PCH) – typically not a problem
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RAB setup failures1. Admission Control (AC) failures – RADIO
Posible to
reduce the
code usage?
UpgradeBTS power
High UL
interference/loadPosible to reduce
R99 usage?
High non-
HSPA load
High non-
HSPA load
Posible to
optimize
throughput?
Upgradeto 2nd carrier
‘
DL power
Marginal Load Time Share DL > 50%
Overload Time Share DL> 2%
Average DL R99 Load > PtxTarget
Marginal Load Time Share UL > 50%Overload Time Share UL> 2%
Average UL R99 Load > PrxTarget
Noise floor of the System
>-90dBm
High DL load
Failures due to
AC >1%
R99 power >> HSDPA power
No
Yes
Yes
No
UL interference
Spread. Code Blocking Rate in DL>5%;
SFxx Blocking Rate high
Max_Code Occupancy >95%;Avg_Code Occupancy >80%
Channelization
codes
High chan. Code
utilization
No
• AMR accessibility
• PS R99 accessibility
Yes
External
Interference
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RAB setup failures1a. HSDPA accessibility
• Indicates problems for access of HS-DSCH (HSDPA access failure rate):
1. Due to UL DCH
• Problems of return UL return channel
• Related to R99 radio resources
2. Due to TOO MANY HSDPA USERS
• Licence limit – 48 users HSDPA license upgrade to 64 users
• R99 is selected, which can cause capacity problem in use of radioresources Check radio resources for R99
• If licence upgrade is not sufficient, the Dedicated HSDPA scheduleris an option
3. Due to BTS (channel elements)
4. Due to Iub (transmission)
5. Due to RNC
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RAB setup failures1a. HSDPA accesibility
HSDPA
accessibilit
y < 99%
Go to
RADIO
Resoures
Go to
BTS failures
Go to
RNC failures
Go to
TRANSPORT
failures
1. HSDPA 64 users
License upgrade
Problem in
R99 ?
2. HSDPA Dedicated
Scheduler upgrade
HSDPA Access FR
due to UL DCH
HSDPA Access
FR due to RNC
HSDPA Access
FR due to BTS
HSDPA Access
FR due to Iub
OR LATER
Radio related issues
Others
DCH Selected
due to too manyHSDPA users
> 0.5%
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For internal use
RAB setup failures4. Transport failures
•Indicates lack of transport resources
– Traffic load measurements
▪ Average VCC Ingress/Egress utilisation
▪ Average VPC Ingress/Egress utilisation
– CAC reservations
▪ Allocated Average Capacity of CBR VCC
▪ Allocated Capacity per ATM VCC (cps)
▪ AAL2 connection reservation success rate
– Number of AAL2 Connections
▪ Average AAL2 connection utilisation
▪ Max_AAL2_connections (248 max)
▪ Max_AAL2_connections_HSPDA
–Shared HSDPA AAL2 allocationutilisation Iub upgrade
Posible to
reduce Iub
utilization?
Yes
No
Yes
Fast Failures due to
TRANS/AAL2 Iub >1%
AVG_UP_CAC Reservation > 80%Peak_UP_CAC Reservation >90%
High Iub load
Iub Reservations
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Iu Monitoring
• The scope of this presentation is RNC interfaces monitoring
using measurements in the RNC and in the BTS
Iu-CS
Iu-PS
Iur
RNC BTS
RNC
MGW
SGSN
Iub
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ATM Load Measurements - Overview
ATM Load Measurements in RNC
• Virtual Path Connection (VPC)
• Virtual Circuit Connection (VCC)
• ATM interface
A T M i n t e r f a c e
Virtual path
Virtual path
Virtual channel
AAL2
connection
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