PROJECT 2016-2017

IMPLEMENTATION AND

MAINTENANCE OF BSS SYSTEM FOR

GSM CDMA AND 3G

Presented By:

K Mathew Shilling Jose

TM1514311(BITM)

Company Information

An Indian broadband and telecommunication service provider based in Mumbai, Maharashtra, India.

Tata DOCOMO arises out of the Tata Group’s strategic alliance with Japanese telecom major NTT

DOCOMO in November 2008.

The company has been rated as the no. 1 wireless operator in terms of overall customer satisfaction

across Maharashtra (including Mumbai) and Goa, in surveys commissioned by the Telecom

Regulatory Authority of India (TRAI).

PRODUCT AND SERVICES OFFERED:-

Tata DoCoMo CDMA

Tata DoCoMo GSM

Tata DoCoMo Walky

Tata DoCoMo Photon

Tata DoCoMo Internet

OBJECTIVE OF THE PROJECT

The objective of the project is to Implement the BSS(Base station

subsystem) site and to maintain the same with Operation and

Transmission team.

The Maintenance part is done using the Network Management Center

and Operation and maintenance center.

Project Overview

1. BASIC CONCEPTS OF BASE STATION SUBSYSTEM (BSS)

MS, Mobile Station

The mobile station is the device that is used by a subscriber in order to send and receive

traffic. The MS contains of the Mobile Equipment (ME), which can be a cellular phone or a

laptop equipped with a GSM card, and a Subscriber Identity Module (SIM) containing among

other things subscriber information.

BTS, Base Transceiver Station

The base transceiver station is the network node sending and receiving messages via the air

and contains therefore only functions that are related to radio and which must be located

closest to the radio interface, as channel coding and decryption for circuit switched traffic.

BSC, Base Station Controller

The base station controller is controlling one or more base transceiver stations. It also handles

functions related to the radio equipment, as channel allocation and administration to the

mobile station, handover procedures, paging, and sometimes also voice transcoding. (Some

vendors implement the transcoder in the base transceiver station instead.)

2. CONCEPT OF MAINTENANCE

NMC, Network Management Centre

The network management centre is controlling the GSM network and reporting transmission

problems.

OMC, Operation and Maintenance Centre

One operation and maintenance centre can control hundreds of network nodes within the

GSM network. It is sending alarming reports for different kinds of faults, as incorrect input.

After the understanding of the architectures theoretically, its practical application is

understood through the different computers used to control as well as monitor the various

sites to which the connectivity is provided by the company. The practical application

involve:

Working with the OMCR (Operation and Maintenance Centre Radio) to monitor the

BSS system by checking the alarms and investigating the different faults that have come up

at a particular site.

With the NMS (Network Management System) team to monitor transmission media and

transmission mux (multiplexers) and the troubleshooting of the faults.

With PNMS team to help monitor microwave media and the equipment failure (IDU and

ODU).

A clear understanding is achieved on visiting the cell sites or the service sites and

observing the troubleshooting techniques involved to solve the different issues that had

come to pass.

voltage, corrupt data signals etc.

IMPLEMENTATION OF BSS FLOW DIAGRAM

Process Flow Chart for Project Roll Out

AOP Site list Approved By Business team

Sites RF Survey and SAM Planning

Sites Loaded to

Different IPs for

Feasibility

NO

Yes

Not Feasible sites loaded to Build

As Anchor with BU approval

Service Order (SO ) Issued to IPs for

Feasible sites

Sites Declared Ready for Installation

(RFI ) by IPs

Sites Loaded in SMP portal for

Location ID creation

FAR ID and WBS is created in

SAP

Material Requisition (MR ) given

to WH Team

Material Dispatched

from WH to Site

EMF Site Installation and Integration

EMF Submission and SCFT

Site Declared RFS to Business

team

1. AOP Site list Approved By Business team

Analyzing the need for new sites

Business planning and decision making

Allocating fund

2. Sites RF Survey and SAM Planning

Survey for suitable place

SAM PLANNING-giving unique ID

3.Sites Loaded to Different IPs for Feasibility

Approaching different infra providers such as

GTL

Indus tower

American tower

Unitech

Idea

4.Service Order (SO ) Issued to IPs for Feasible Sites

Selecting one of the infra provider based on the feasibility

Ordering and giving money for Ips

5. Tower or Pole

6. Sites Declared Ready for Installation (RFI ) by IPs

Indoor Site

Outdoor Site

Now a days 90% are outdoor sites (cost saving)

7. Sites Loaded in SMP portal for Location ID creation

Check whether Power Equipments is installed or not

ID creation

8. Tray and Duct

9. Line of sight survey-check nearest visible cell site

10. Material Requisition (MR ) given to WH Team

11. Material Dispatched from WH to Site

12. Site Installation and Integration

Installing as per specification , three sector antenna 0,120,240 to cover entire 360 degree space. It may vary according to requirements.

Microwave antenna is checked and installed as per link budget.

Cell site Integration and commissioning(I&C).

13. EMF Submission and SCFT

Handover site for Sector Carrier and Functional Test (SCFT)

Drive test is done for SCFT.

For CDMA drive test done by checking all the parameters through software

agilent.

14.Site Declared RFS to Business team

Acceptance test to operation team.

Finally site is declared to business and marketing unit (sales team).

LINK BUDGET OF MICROWAVE HOP USING PATH LOSS

TOOL

MAINTENANCE OF BSS SYSTEM

Alarms Detected in Login Server

1. Network Management System

In this only ECI MUX will be visible others are unmanaged unit.

It is down mostly due to the fiber cut and if one fiber is degraded i.e. Only on the single fiber loss

is occured.

2. Passolink Network Management System

AIS –Alarm Indication Signal

At particular node issue occurs in the ring then you get a AIS alarm.

RDI-Radio Dual Interference

Optical fiber break, Optical interface to the OTR line is down, then the team goes and replace the fiber or

OTR. Finally they reset the IDU and check the service.

Line of Sight

Login the metering and check if the RX level is increased then align the microwave antenna in a proper

direction. So RX level will come to original.

Creation of building-occurence of interference

Interference

It occurs due to same frequency in this case the field engineers will go to area and

change the frequency in radio settings or put dummy frequency.

If it is not resolved yet then exchange the ODU with new ODU.

3. Operaton and Maintenance Center

VSWR-Voltage Standing Wave Ratio

It occurs due to loose connection between cable and BTS connectors

Sector High Temperature

This alarm occurs due to Fan module faulty

Sites visited by me: Alarm sign:

1. Pun_Moshi shanti Trade_iPASO 1.Green-stable,active or live

2. TalegaonMor_1472-Lake Parad_2405 2.Green slow blinking-live

3. Bhosari GBT—Parekh Engg 3.Green fast blinking-Communicating or

4. Parekh Engg—Bhosari GBT Downloading data

5. HDFC Colony 4.Amber-Warning alarm

6. Shahu Nagar 5.Red-Issue

7. Thermax—HDFC Colony 6.No LED-Equipment Faulty

LIMITATIONS

The company was very supportive and helped me learn about everything

that they had to offer. Language was one of the main drawback for me to

understand few things in depth. And few things I missed out due to time

constraint are listed as follows.

Call Scenario

Call Establishment

Call Setup

Quality of Service

FINDINGS TATA’S CDMA- 2 BSC and 550 BTS

TATA’S GSM- 7 BSC and 1200 BTS

TATA’S 3G- 3 RNC and 1150 BTS

Based on the TRx capaacity of BTS you can connect it to BSC.

For Example,

If 7 BTS having 1100 TRx you can connect all 7 BTS to a single BSC of 1100 TRx capacity.

COMPARITIVE ANALYSIS

Advantage of New technology

1. Number of E1 can be increased.

2. Helps in improving the number of calls.

3. Data connection can be given to many user from single device of 2mbps speed for each user.

4. By combining 3 to 4 E1 we can give speed of 8mbps to a single user.

Disadvantage of New technology

1. Replacing with New technology in all site will gives many unused E1 connection.

2. High cost and manpower is needed.

RECOMMENDATION

Complete visual inspection of the equipment and connections.

Cleaning of filters, fans.

Pre-monsoon checks.

In the future while deploying the fiber cable make sure that it is not near or close to

the HT&LT electric cable MSEB, because when the optical cable contact with high

tension electric cable during lightening and thundering and the reverse voltage

produced in the cable will destroy the BTS.

Few times fiber cable’s are installed through private area ,person from that area have

the rights to cut the fiber which is passing through his area. So it should be avoided.

The labour’s working in the field should be properly trained in some case they cut

the wrong fiber unintentionally.

New techonolgy should be installed only if it is needed.

Key Learnings

How to build up a BSS site

Clear knowledge about existing device and new devices

Process of implementation of BSS

Maintenance of BSS system

How to overcome the issue created by Line of Sight

THANK YOU