3G Nokia Siemens Document

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%



For internal use

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



For internal use

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



For internal use

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



For internal use

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%



15 © Nokia Siemens Networks Presentation / Author / Date

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




For internal use

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




For internal use

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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