ttp30026w - lte rf optimization methods pr

LTE RF Optimization Methods & ProceduresTTP30026

Bill (William) Hsieh

Central Quality Assurance & Customer Care

July 14, 2010

2 | Presentation Title | Month 2006 All Rights Reserved © Alcatel-Lucent 2006, #####

Learning Objectives

Upon completion of this training session, the attendee should be able to:

Get a high level overview of the Optimization Methods and Procedures

Recognize the trade offs between Local Optimization vs Partial Remote

Optimization, Syncro Test vs. No Syncro Test

Recognize the functions of RF Engineer, Data Collector, and Driver

Get a high level overview of how to collect data and analyze data

Detailed steps are presented in “LTE RF Optimization M&P”, draft available in

2 weeks

Write to [email protected] for URL

TTP21400 eDAT for LTE, TTP30025 LTE Toolkit and LLDM


Event Sequence

Attend kick-off meeting with customer to confirm mutual expectations on:

Entrance criteria

Exit criteria like throughput, hand-over failure rate, and other KPIs.

Local or Partial Remote Optimization

Interface between the customer and ALU

Problem resolution: like how to change antenna, how to change

parameters, when to collect data

All the negotiated items should be written on a piece of paper and signed

by both the customer and ALU representatives.


Event Sequence (Continue 1)

Order WIND servers, DAT machines, and Data collection kits

Configure WIND servers, DAT machines, and Data Collection machines.

Install WINDS server

Hire drivers, data collectors, rent van, train data collectors

If the sector test information is not provided by either the customer or third

party, conduct sector test to ensure that the eNodeB and antennas are

configured, installed, and operates properly.

For stationary KPIs, identify the data collection spots. (SINR between 13 and

17 dB)

For mobility KPIs, design cluster test drive route and the System Verification

drive route. Obtain customer agreement on the cluster driver routes.

Baseline the existing system


Event Sequence (Continue 2)

Analyze the data, identify problem area, devise solution, and obtain

agreement from customer about the solution

Change the parameters, re-collect the data

After having done all the cluster tests, conduct the System Verification drive.

Similar to Cluster drive, collect data, analyze data, identify problem areas,

devise solutions, obtain agreement from customer about the solution

Chang the parameters, and re-collect the data.

Compare the final result with the Baseline result

Prepare Exit Package

Obtain customer’s agreement in writing on the satisfaction of exit criteria


Local vs. Partial Remote Optimization

Definition

Local: All personnel in market

Partial Remote: Only some of the engineers in marke

Benefits of Partial Remote Optimization

Efficient use of skilled resources

Saves on Travel and Entertainment

Keep RF engineers happy


Partial Remote Optimization

Requirements

Customer is receptive

Market requires more than one RF engineers

Well defined communication between in-market team and off-market team

Share server, VPN, FTP, login, password available


Syncro Test benefits

Not going to the data collection site.

Speeds up turn around time by remotely transfer the data from the data

collection van to the Data Analysis PC.

The RF engineer can analysis the data in the office, change the parameters

and re-collect the data.

Collect data from several vans at the same time.

The Syncro Test data collector can be less skillful and easier to recruit

Requirement

Access to a separate data network


Entrance Criteria

Should be specified in the Statement Of Work before the start of Optimization

Status of Network should be delivered to Lead RF engineer 1 week before

Optimization

Provide RSRP map and SINR map

Provide eNodeB site locations

Provide Neighbor List

Specified condition of the test environment, like minimum RSRP, SINR,

backhaul available throughput

Having completed all integration tests for all eNodeBs within 2nd tier of

cluster


Entrance Criteria (Continue 2)

Being free of critical and major alarms for 48 hours

Having transmitted the proper Cell ID from each sector

Having successfully handovered calls between sectors of the same eNodeB

Having cleared the spectrum


Exit Criteria

Up Link Throughput

Down Link Throughput

Radio Resource Control (RRC) Failure Rate

Radio Resource Control (RRC) Drop Rate

The testing conditions, KPI definitions and Exit Criteria should be clearly

defined and signed by ALU and the client.


Optimization Data Collection Overview


WINDS Application Server PC

Should sit close to PGW

Should NOT go through private or public internet

Should be assigned a static IP address

WINDS

VNC

Syncro Test WINDS Probe


Configuring Data Collection PC

Turn PPP Compression off

Turn IP header compression off

With Syncro Test

o Enable remote data collection

o Quick turn around

o Requires access to a separate data network

Without Syncro Test

o More intimate knowledge of data collection environment


Configuring Data Collection PC (Continue 2)

WINDS Client

UDP, you can pre-define for both send and receive

o Data rate

o Payload size

o Duration

FTP, you can pre-define for both send and receive

o Data block size

o Duration

Ping, you can pre-define

o Timeout

o Duration


Data Collection PC (Continue 3)

Syncro Test LLDM Probe:

Controls LLDM

Serial Splitter

Distributes GPS signal to several com ports

Software is pre-installed in the Data Collection PC

Street Atlas:

You can predefine drive route

You can predefine eNodeB locations

It will show you where you are with reference to eNodeBs and predefined drive

route

It will help reduce the chances of making wrong turns and having to re-collect

the data


DAT PC

Syncro Test (Master Controller)

Remotely controls the LLDM via Syncro Probe

Pre-configures the test cases

VNC

Remote control of WINDS Server

eDAT

Data Analysis


Staffing Functions

RF Engineer

Interface with customer

Hire data collector and driver

Train data collectors

Obtain spectrum clearance data

Define clusters and verification drive routes

Setup drive testing tools

Analyze collected data

Consult with customer to change parameters and antenna azimuths and tilts

Prepare exit package

Obtain customer sign off


Staffing Function (Continue 3)

Data Collector:

Manage the data collection PC, the UE, and the GPS

Start and stop the data collection at the proper location

Make sure that there is communication between the eNodeB and the UE

Make sure that data is being collected by the data collection software

Transfer the collected data to the Lead Engineer

Assist the driver in navigating along the drive route

Driver:

Obtain the drive route from the Lead Engineer

Prepare sufficient money for toll and gas

Drive safely


Sector Testing

Purpose: Ensures sectors are:

Radiating at expected power levels

Radiating in the correction directions

Radiating the correct Cell ID

Handing over to intra-eNodeB sectors properly

Procedure:

Start from the bore sight of the sector to be tested within ¼ to ½ cell radius

Set up LTE session on UE1, start the ping test, then start logging on LLDM

Set up LTE session on UE2, start FTP, start logging on LLDM

Collect data for a few minutes to obtain stationary throughput data under good

RF condition.

Drive around the eNodeB.

Once in the bore sight of the second sector, repeat the stationary test


Stationary Test

Purpose: Collect data in a predefined RF condition while standing still

Locate positions that meet predefined RF conditions, like SINR between 17 dB

and 21 dB using LLDM

The spots should be in areas where the van can park for a long time

Identify the spots on a map

Conduct predefined tests


Cluster Test

Purpose: Optimize a manageable piece of the network at a time

Cluster size: 15 to 30 eNodeBs

Core area will be divided into clusters

Border area will be grouped with Inter-frequency or Inter-Technology handover

enabled eNodeBs.

Available drive routes

Readiness of eNodeBs (most efficient is when 100% of the eNodeBs are

available)

Heavy handover area should not be broken up into multiple clusters


Cluster Test Drive Route and other considerations

Within the predefined coverage area based on RSRP or SINR

Total duration of a 19 eNodeB cluster drive should be between 5 to 9 hours

Covers all the eNodeBs within the cluster

Covers all the major rouads and intersections

Covers all the handovers within the cluster

Avoid coverage holes

Other considerations:

Loaded and Un-loaded drives should use the same cluster drive route

Forward Loading: Use OCNS

Reverse Loading: will not perform because of high cost


Data Collection – With Syncro Test – DAT PC

For RF engineer in the office:

In the DAT PC, find out the IP address of the PPP adapter

Tell Data Collector in the van of the IP address


Data Collection – With Syncro Test – Data Collector PC

For Data Collector in the van:

Physically connect LG UE to the Data Collector PC

Start LLDM

Set Com Port to allow LLDM to communicate with UE

Start LG LTE CM

In the LG LTE window, click to start the synchronization process and the

attach process

Start Syncro Test LLDM Probe to display:


Data Collection – With Syncro Test – Data Collector PC (continue 2)

•Click Tools, and click options to display


Data Collection – With Syncro Test – Data Collector PC (continue 3)

In ProbeID, type ina uniqueidentifier.

InAdapter,selectWirelessConnection

InControlServerAddress:Key in theIP addressprovidedby the RFEngineer

Click OK

•In Syncro test LLDM Probe, click Register to enable the RF engineer to controlLLDM Probe from Master Controller in the office


Data Collection – With Syncro Test – DAT PC

Syncro Test Master Controller window:

Click File, and click

Load Predefined

Tests

Click Predefined

Tests and select the

test case

Click Start Test

Click Start Logging

Click Stop Test

Click Stop Logging


Data Collection – With NO Syncro Test

Use Only WINDS Client and LLDM

Connect LG UE to the Data Collector PC

In the Data Collector PC, start LLDM

Start LG LTE CM

In the LG LTE window, click to start the synchronization process and the

attach process

Start WINDS Client


Data Collection – With NO Syncro Test (Continue 2)

In WINDS window, click Transfer, select the test case and fill in the

parameters

Click Start to start the test

In LLDM window, click to open Logging Status window


Data Collection – With NO Syncro Test (Continue 3)

Click Start to start logging.

Click Stop to stop logging.


Baseline Existing System

Before optimization, collect data for every cluster

Calculate the KPIs

Used to compare with Post-optimization KPIs


Data Analysis - eDAT

Import LLDM data

and WINDS data

Automatically

import maps from

ALU server

Filter and massage

and present data in

many different

ways

For example,

Present several KPIs

on the same map to

help identify

problem


Data Analysis – eDAT (Continue 2)

Map and Grid together



Identify and group messages



Filter in only data in agreed up RF environment



Build-in Reports

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