The document discusses key performance indicators (KPIs) related to WCDMA network planning and optimization, focusing on metrics such as call setup success rate, accessibility, and drop call scenarios. It outlines issues that can cause genuine call setup failures and drop calls, including RF issues and system problems in the base transceiver stations (BTS) and radio network controllers (RNC). The analysis aims to improve network performance by identifying and addressing these failures, particularly through missing neighbor analyses.

1. WCDMA
KPIANALYSIS
&
OPTIMIZATION
Network Planning & Optimization
Nokia 3G Technology
By:Yogender Rana
(Ref: Nokia/web/www)

2. KPI Definition
Cell availability
Call Setup Success Rate (CSSR)
Call Drop rate
SHO/ISHO/HSPA SCC success rate
Packet Session setup/success rate (NRT, HSDPA, HSUPA)
In NOLS:
RNC counter description
NetAct DB description for RNC measurements
WCDMA RAN Key Performance Indicators
Key Indicator Changes
Measurement Changes

3. KPI Definition
Accessibility
RRC Setup & Access Rate
RAB Setup & Access Rate
Call Setup Success Rate
PS Setup Success Rate (NRT, HSDPA, HSUPA)

4. KPI Definition
Retainability
RRC Drop Rate
RAB Drop Rate
PS Success Rate (NRT, HSDPA, HSUPA)

5. KPI Definition
Mobility
SHO/ISHO Success Rate
SHO Overhead
HDSPA/HSUPA SUCC success Rate

6. KPI Definition
Usage
Cell Availability
Ave. Uplink Load
Ave. Downlink Load
HSDPAThroughput
CellThroughput

8. GenuineCallSetup
FailureScenarios
RF issue
 Interference / Dominance / Coverage
 Missing neighbor
System Issue – BTS
 No response to “RRC Connection Request”
 “RRC Connection Reject” to “RRC Connection Request”
System issue – RNC
 “CC Disconnect” after “Call Proceeding” due to “DL RRC Connection
Release”
Core NW
 “CM Service Abort” after “CM Service Request”
System issue (test number)
 “CC Disconnect” after “CC Progress”

9. Genuine DropCall
scenarios
RF issue
 Interference / Dominance / Coverage
 Missing neighbor
System Issue – BTS
 Sudden “CC Disconnect” due to “DL RRC Connection Release””
 Sudden drop to idle, no disconnect messaging.
System issue – RNC
 Sudden “CC Disconnect” due to “DL RRC Connection Release”

14. Call setup failures –
Missing Neighbor
Missing neighbor analysis over the whole route(3G-3G, 3G-
2G)
Search for failures due to missing 3G-3G neighbors
Search for failures due to missing 3G –2G neighbors
It is suggested to place 2G scanner to the test vehicle

15. CallSetup Failure
Analysis- Block B
The purpose of this activity is to check the Random Access Process is
working adequately by investigating whether AI (Acquisition Indicator)
has been received through DL AICH If AICH was not received by UE, the
cause of the problem can be classified into:
Inadequate RAN parameter related to Random Access: RAN parameter settings for
pre-amble transmission or open loop power control information is not correct.
UL Coverage limit: UL coverage of UE is smaller compared to serving cells DL
coverage so that UE’s Tx power cannot reach serving cell.

59. Network
Planning &
Optimization
Nokia3GTechnology
Thank You