nastar v600r008 training slides(umts)

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23/4/19

iManager Nastar V600R008 Training Slides(UMTS)

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

UMTS Theme Analysis Functions in iManager Nastar V600R008

Coverage analysis

Intra-frequency neighboring cell analysis

Uplink interference analysis

VIP analysis

Complaint analysis support

Cell performance analysis

Pilot pollution analysis

New theme analysis functions

in V600R008

Theme analysis functions in V600R002


UMTS Intra-Frequency Neighboring Cell Analysis

Normal method for neighboring cell analysis: 1. Find the cell with the largest number of missing neighboring cells, the cell with the

poorest coverage, and the cell that has many dropped calls, and then analyze them one by one.

2. Analyze the key sites of the central area, the overlapped coverage areas between RNCs and the cells with overlapped areas by the equipment of multiple vendors.

3. Check the geographical location of the missing neighboring cell when a cell with a serious problem is found according to the engineering parameters to assist in analyzing the problem cause.

4. Check the relative geographical location of the site and the cell antenna and pay attention to the antenna height, service area type, and other factors during the geographical analysis.

5. Conduct corresponding analysis on the 3G network according to major local services. The properties of data services and the typical features of voice services differ from each other.

The MRs of UEs reflect the actual propagation status of radio signals. By using the UMTS neighboring cell analysis function, the Nastar can aggregate and analyze the MRs and events reported by UEs on the network to check for the redundant and missing neighboring cell configuration of a test carrier and to check for the priorities that need to be adjusted. By directly displaying information, the Nastar helps you solve network quality problems that are caused by redundant or missing neighboring cells or incorrect priorities of neighboring cells.


Case 11. Obvious missing configuration of neighboring cells2. Obvious redundant configuration of neighboring cells3. Improper antenna azimuth and cross coverage4. Antenna being blocked or BTS working abnormally

1. A lot of L1 neighboring cells are not configured for Yan Qiao 12.

3. Serious cross coverage: Bei Ai 12 site, the No.1 configured neighboring cell is 40 m high and its downtilt is only 1 degree. Yan Qiao site is 25 m high, which causes cross coverage of Bei Ai 12.Adjustment suggestion: Increase the downtilt of Bei Ai 12 to control the coverage range.

2. Bei Ai 22, 32 and Yan Qiao 12 are in opposite directions. Obviously, redundant neighboring cells are configured in terms of geographical locations. Zhong Jiaquan 12 is the backward L2 neighboring cell of Yan Qiao 12, the number of times of active status is 0, and the number of 1A1C reported is also 0. Therefore, the neighboring cell relationship can be deleted.

4. Zhong Ding 31 is obviously opposite to Yan Qiao 12 but is defined as a redundant neighboring cell. Check if the antenna of Zhong Ding 31 is blocked or if the cell is working abnormally.


Suggestions on Neighboring Cell Configuration

The engineering parameter information needs to keep consistent with the

configuration data to improve the efficiency and accuracy of the analysis of

missing and redundant neighboring cells.

The antenna azimuth, downtilt, and antenna height in the engineering

parameter information can guide the analysis of remote neighboring cells, cell

effectiveness and cross coverage.

In the case of multi-vendor hybrid networking, accurate engineering

parameters of other vendors (information such as latitude and longitude, P-SC,

ARFCN_DL, CI, RNC and cell name) can help the system provide accurate

names for the undefined neighboring cells to conduct neighboring cell

relationship analysis of the overlapped area.


UMTS Coverage AnalysisThe UMTS coverage analysis function is used to analyze the MRs from the user equipment (UE).

These analysis results can help you judge the coverage status of the test cell on the network

and determine whether there is any cell of poor coverage, cross coverage or poor QoS on the

existing network.

• The MRs from the UMTS UE contain information about downlink RSCP, Ec/NO and

transmission delay (TP) of UE access.

• The Nastar conducts coverage analysis on the selected cell after you set the coverage

analysis conditions. The analysis result will be displayed in the forms of two-dimension (2D)

diagram, three-dimension (3D) diagram and table. • The 2D diagram shows the AMR, VP, BE, AMR+BE and OHTER services, and the indexes

include RSCP_DL, Ec/Io_DL, and TP. • The 3D diagram shows the PS and CS services. Each service contains three indicators, that

is, RSCP_DL, Ec/Io_DL, and TP. • The overview table shows the overview of indicators corresponding to the services

mentioned in all the 2D diagrams. • The coverage analysis result can be exported as .csv or .xls files. You can optimize the

network coverage according to these exported analysis results.


Network Performance Evaluation Evaluate the network radio condition based on the call information of subscribers

Good network coverage (85% RSCP > – 100 dBm, Ec/NO > – 12 dB)

Poor Ec/NO Good

Both are poor

Poor RSCP

Good qualityMore than 90% of Ec/NO is higher

than – 12 dB.

Coverage distance is primarily within one kilometer.

Good coverage. More than 90% of RSCP is higher than

– 100 dBm.

Support for statistics of dual-indicator threshold percentage.


Problem Location

Service Type

Total Number of TP MRs

Total Number of RSCP

MRs

Total Number of Ec/NO

MRsAverage

TP

Average RSCP(dBm)

Average Ec/NO(dB)

AMR 81 234 234 5 -91 -8

BE 7039 11945 11945 3 -103 -11.5

The subscriber complains that network access in a certain area is difficult. It is found that the area is within the coverage of Wei Xing 31 cell.The data corresponding to the UMTS coverage analysis shows that both the RSCP and Ec/NO in the PS domain of the cell are poor.No missing neighboring cells of the cell are found. According to the analysis, the antenna downtilt of the cell cab be adjusted.

The 2D diagram of BE service shows that the subscribers in average are about 600 m away (70% of the TP is 3).

In 3D diagram (PS: Ec/NO VS TP; PS: RXCP VS TP), neither RSCP nor Ec/NO is good when TP is 3. The average RSCP is -102 dBm and ECNO is about -11 dB.


Distribution by ServiceService Type Total Number of MRs Average TP Average RSCP(dBm) Average Ec/NO(dB)

AMR 6595 9 -94 -8

AMR+BE 53 4 -89 -7

BE 3485 43 -89 -5.5

VP 447 12 -95 -10 The subscribers are distributed by service type.The remote subscribers often use data services, whereas the near subscribers often use voice services.The level and quality of both services are good.


UMTS Uplink Interference Analysis The UMTS uplink interference analysis includes management of the uplink interference

analysis task and query of the UMTS uplink interference analysis report. The system conducts

the following operations according to the received total wideband power (RTWP) reported by

the NodeB: Preliminarily determining the interfered BTS through the interference ranking function

Determining the interference characteristics by analyzing whether the main and diversity

Received Signal Strength Indicators (RSSIs) are normal according to the main and diversity

interference signal strengths and the trend chart

Determining whether the antenna feeder has problems in receiving signals through the main and

diversity interference difference diagram


Case

Uplink interference found in Dong E. The typical strength of interference signal is about -85 dBm.

Interference found

Uplink antenna problem found

Check the main-diversity level distribution. If it obviously offsets to one side, it indicates that a branch is abnormal in the receive channel.

Main-diversity

NormalAbnormal


UMTS VIP AnalysisThe UMTS VIP analysis function enables you to routinely monitor the calls of the selected VIP

subscribers on the network. By analyzing the monitoring reports, you can learn about the QoS of

the VIP subscribers. In addition, it helps network engineers actively analyze and locate possible

network problems of VIP subscribers in advance, thus improving the satisfaction of VIP subscribers.

The Nastar supports in-depth analysis for the VIP subscribers whose raw data is collected in

advance. If the KPIs of VIP subscribers in a group deteriorate, and if network engineers cannot go

to the site for problem recurrence and location, the Nastar can be used to obtain the detailed call

records of the VIP subscribers within the specified period. After analyzing the records, the Nastar

can quickly identify the key call records that may deteriorate the KPIs, help to analyze the

information such as link quality before call release, signaling process, and exception cause, and

thus assist network engineers in quickly locating VIP problems.


Interface IntroductionSelect Group or User to display the related KPIs

CS KPIs

CS KPIs and trends

Network KPIs and trends

PS KPIs and trends


Interface Introduction

Select the VIP active cells to display the cells in the GIS


Cases-Call Drops

Right-click on the table, and then choose Start Further Analysis from the shortcut menu.

Rank users according to the number of abnormal KPIs. In this table, the user whose IMSI is 460014130035269 has many abnormal KPIs (including one CS call drop).


Cases-Call Drops

The signaling shows that the call is dropped because the RNC sends an IU RELEASE REQUEST message to the CN upon wait timeout.

The MR before the call drop shows that both the RSCP and Ec/NO of the active cell are poor, and the RSCP and Ec/NO of the cell in the inter-frequency report are also poor. Check the coverage of cell 20803.


UMTS Complaint Analysis Support The Nastar obtains history call records of subscribers from the network, and then filters,

aggregates, and analyzes data based on a specified history period and detailed call records of

subscribers in a specified area, thus assisting in problem location and solving. The complaint

analysis support function consists of the aggregation and analysis of cause types in call

reports from complaint subscribers, aggregation and analysis of information about call reports

from complaint subscribers, analysis of detailed information about call reports from complaint

subscribers, analysis of procedure before the signaling release in call reports from complaint

subscribers, and analysis of active cells in call reports from complaint subscribers.



Detailed information about the complaint subscriber

Signaling procedures before and after the call release of a complaint subscriber

Overview table of call records of complaint subscribers

Select an aggregation mode

Cause type navigation tree

Export the overview information table


Case-Inter-RAT Handover Failure

The subscriber reports a 3A event at 20:05:07. GSM cell CI:7218 has good signal quality. Then, the subscriber conducts inter-RAT handover to the cell.

The signals of GSM cell CI:7218 fade fast. Therefore, the signals become very poor during the handover. As a result, the handover fails because of the wait timeout on the Iu interface.


UMTS Cell Performance Analysis With the UMTS cell performance analysis function, the Nastar obtains the abnormal

call data of problem cells, thus quickly identifying problem cells and facilitating in-

depth problem analysis.

The Nastar allows you to analyze the exceptional call records based on the RNC NE or NE group. It provides the cell Top exception cause analysis function to help network engineers further understand the specific causes of some exceptions, thus improving troubleshooting efficiency.

The cell Top exceptional subscribers analysis function enables the network engineers to further understand the Top subscribers whose network indicator values are low after finding the major exceptions of the problem cells. It can help the network engineers quickly identify the Top subscribers causing certain exception to the problem cell. This helps the network engineers improve the cell performance in the fastest way by solving the Top subscribers problems.

The Top problem cell analysis function enables the network engineers to conduct exception analysis on a large number of cells in the RNC in the case that they are not sure about the specific problem cells. As a result, the Top cells with the most exceptions can be quickly found.



Abnormal object selection area

Analysis result area of exception types

Chart of exception type analysis result

Overview of TOP exception analysis result

TOP exception cause analysisTOP exceptional subscriber analysisTOP exceptional cell analysis


UMTS Pilot Pollution Analysis The UMTS pilot pollution analysis function enables the Nastar to analyze

subscriber calls. Through the analysis of subscriber calls, the Nastar

identifies the cells where pilot pollution exists, the cells that cause

interference, and the interference strength. The Nastar also displays the

analysis results on a map so that you can learn the detailed situation of

pilot pollution. This reduces the DT time and improves the problem

location accuracy.


Case 1

E Shan 11, 21

Zhang Jialou 11Zhang Yang 11

Ru Shan 11

Zhang Jialou site is 55 m high and its downtilt is 4 degrees. This results in a wide coverage. The site can be easily polluted by Zhang Yang, Ru Shan and Yuan Shen sites about 2 km away and the number of pollution events is big.

Yuan Shen 21, 31

E Shan site is 58 m high. The downtilt of E Shan 11 is 0 degrees and that of E Shan 21 is 1 degree. Due to the cross coverage, Zhang Jialou 11 nearby is easily polluted and the number of pollution events is big.

Dong E site is 25 m high and its downtilt is 15 degrees. It has few pollution events to Zhang Jialou 11.

Button for switching between the polluted cell and the polluter cell

Dong E


Case 2

Zhang Yang 11 has the same pollution impact on Zhang Jialou 11 but has few pollution events to Yuan Shen. Therefore, there is cross coverage in Zhang Jialou.

Zhang Yang 11

Yuan Shen 11,21,31

Zhang Jialou 11

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nastar v600r008 training slides(umts)

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