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Teletalk UMTS Architecture. Teletalk 3G Packages

Teletalk UMTS Architecture. Teletalk 3G Packages

Teletalk 3G Packages :

Teletalk is only govt. organization of Bangladesh who provide a lot of teletalk 3g packages.Teletalk offer many package for their subscribers. Teletalk developing their services day by day. They provide 3G high speed internet services. Teletalk 3g packages are listed below-

  • Teletalk Bornomala Package
  • Teletalk Youth Package
  • Teletalk Teletune Package
  • Teletalk Agami Package
  • Teletalk Ekush Package
  • Teletalk Bijoy Package
  • Teletalk Standard Package
  • Teletalk Shadheen Package
  • Teletalk Shapla Package

Please visit Teletalk official site to know more about Teletalk 3G Packages 

Teletalk 3g Services:

The Teletalk 3G services are offering its subscribers are:

  • Video on demand
  • Game on demand
  • Video telephone will be possible after migration.
  • Tele-shopping
  • Tele-banking financial services
  • Database Access Information service
  • Internet service
  • Tele Medicine
  • Remote Learning,
  • Mobile TV

Teletalk WCDMA Architecture :

Teletalk WCDMA architecture is the standard modulation technique for 3G Radio Access Network. WCDMA architecture technique is appropriate for migration from Global System for Mobile Communications (GSM)/ General Packet Radio Service (GPRS) to Third Generation (3G).

wcdma architecture
WCDMA Architecture

According to following diagram Teletalk has the choice to slowly evolve along a migration path toward the original objectives of 3G to obtain the smoothest possible transition from the 2nd to the 3rd generation of mobile communications [4]. The cell parameters of 3G are

  • Radius = several kilometers (according to Antenna NodeB parameter set)
  • Transfer rate = 384 kbit/s
  • Mobility = 120 km/h or high 500 km/h

GSM Positioning of Teletalk:

The second generation of cellular services (2G) of Teletalk Bangladesh Limited as characterized by the GSM standard is a TDM-based technology. GSM run over Plysynchronization Channel (PDH)/Synchronization Channel (SDH) access networks, relying on a wide variety of wire line and wireless transport solutions. The present positioning of Teletalk in GSM evolution path is shown in below figure-

GSM phase before teletalk 3g
Teletalk GSM Phase

General Packet Radio Service (GPRS):

The relatively new 2.5G (GPRS) data service is still very much a TDM-based technology, providing an interim solution.

Existing GSM/GPRS Network Architecture: 

Existing network architecture represents the mobile network components. They consist of BTS, BSC, MSC, TRAU, HLR, VLR, AC, and Equipment Identification Register (EIR). Figure below  shows the present network architecture.

GSM to teletalk 3g
GSM to Teletalk 3G

Teletalk Example Identities and Code: 

MCC = 470 ——— First 3 digits of IMSI

MNC = 02 ——– 4th & 5th digits of IMSI 02 – Aktel

LAC = 4 digit hexa code —– 00CB

MSIN  = 1234567890

CC = 880 15 50155097

NDC = 880 15 50155097

SN = 880 15 50155097

LAI = MCC+MNC+LAC = 470 04 00CB

CI = 4 digit hexa code ———- 01CA

CGI = MCC+MNC+LAC+CI = LAI+CI = 470 04 00CB 01CA


IMSI = MCC + MNC + MSIN = 470 + 04 + 1234567890

MSISDN = CC + NDC + SN. MSISDN = 880 + 15 + 50155097

Frequency for Teletalk: 

Type Transmit (MHz) Receive (MHz) Total (MHz)
GSM – 900 890 – 895.2 935.0 – 940.2 5.2
GSM – 1800 1710-1720 1805-1815 10

GSM 900 : BTS receiver (uplink): fu(n) =890.2+ (n-1)*0.2 MHz

BTS transmitter (downlink): fd (n) =fu (n) +45 MHz

Here n = ARFCN = Absoluter Radio Freq. Ch. no

As for example for an ARFCN of 5 the respective uplink and downlink frequencies can be calculated as follows:

Teletalk uplink fu (n)   =  890.2+(5-1)*0.2 MHz

=  890.2+4*0.2 MHz

=  890.2 + 0.8 MHz

=  891 MHz

Teletalk downlink fd(n)     = fu (n) + 45 MHz

= 891 + 45 MHz     = 936 MHz

GSM 1800 : BTS receiver (uplink ): fu (n) =1710.2 + (n-512) * 0.2  MHz

BTS transmitter (downlink): fd (n) =fu (n) +95 MHz

For an ARFCN of 556 the respective uplink and downlink frequencies can be calculated as follows:

Teletalk uplink fu(n)         = 1710.2+ (n-512) * 0.2  MHz

= 1710.2 +(556-512) * 0.2 MHz

= 1710.2 +  44*0.2 MHz

= 1710.2 + 8.8 MHz

= 1719 MHz

Teletalk downlink fd(n)     = fu(n) + 45 MHz

= 1719 + 45 MHz    = 1764 MHz

Frequency Reuse: Teletalk normally use 4*3 reuse patterns for both 900 MHz & 1800 MHz frequency band. Teletalk use tri sector antenna with 120 degree coverage/sector.

Pay Back Period After Implementing UMTS Architecture: 

Pay back period after implementing UMTS architecture is the length of time required to recover the cost of an investment calculated as Investment/Annual cash flow. In 3G revenue has been 0.5 Taka per Erlang. As a result 3G need 11 months for returning the investment based on only equipment cost where no administrative and others cost is calculated here.

Investment cost =156810820Taka.

Erlang  = 1585.8 E

Revenue / Minute (Busy Hour) = 1585.8 Taka (Without tariff as 0.5 Taka / Minute)

Revenue / Hour (Busy Hour)    = 792*60 = 47550 Taka.

Revenue / Day = 47550/0.1 = 475500 Taka.

Total Revenue/ Month  = 475500*30 = 14265000 Taka.

Payback Period = Investment/monthly income

=156810820 /14265000

= 11 Months (Equipment Cost)

Recommendation of UMTS Architecture:

From this study it is clearly understood that UMTS architecture is very much cost-effective from Teletalk’s perspective. It is to be mentioned that cost-justification is shown here using a pilot project. With increasing capacity the cost will come down further. Only thing that is to be assured the demand for such services are there and subscribers are capable of availing them. Moreover, it will give Teletalk some competitive advantage over other operators. At the same time, it will also be able to satisfy customers’ demand which should be any operator’s prime goal.

Considering all these issues the following recommendations can be made:

  • Teletalk should immediately start preparing a business plan regarding 3G.
  • The strategies should be clear and specific. It’s better to start 3G services on an island basis which should be expanded through-out the country in phases depending on the customer demand and capacity of the customer to avail this service

Acknowledgments :

I would like to express thanks to Mr. All Mamun, Asst Manager, IT and Billing, Dhaka Phone. Many thanks for Mr. Mostafiz, Asst. Manager Network Operation, Teletalk Bangladesh Ltd. for the information he provided regarding the Base Station Subsystem of Teletalk Bangladesh Limited. I acknowledge the help extended by the officers and officials of Teletalk Bangladesh Ltd. for the information they have supplied, without which this thesis would have lost all its merits. Special thanks for Mr. Mohammad Tawrit, Adjunct Faculty, UITS and DGM, Network & Operation, Teletalk Bangladesh Ltd. for his valuable advice, supervision and input. Specially he has taught me the basic and professional skill about Telecommunication Network for implementing teletalk 3G cellular mobile system.

Teletalk Migration from GSM to 3G Part Ten

Teletalk Migration from GSM to 3G Part Nine

Teletalk Migration from GSM to 3G Part Eight

Teletalk Migration from GSM to 3G Part Seven

Teletalk Migration from GSM to 3G Part Six

Teletalk Migration from GSM to 3G Part Five

Teletalk Migration from GSM to 3G Part Four

Teletalk Migration from GSM to 3G Part Three

Teletalk Migration from GSM to 3G Part One

Please contact me for part Four to Ten.

Name : Md. Khondakar Mashiur Rahman
University of Information Technology and Science
ID : 060561
Program : M.Sc. in Telecommunication
Cell Number: +880 17 92 52 53 54

About Engr. Kh. Mashiur Rahman

He is Garment Automation Technologist and Editor in Chief of Autogarment. He is certified Echotech Garment CAD Professional-China, Aptech-India, NCC-UK and B.Sc. in CIS- London Metropolitan University, M.Sc. in ICT-UITS. He is working as a Successful Digital Marketer and Search Engine Specialist in RMG sector during 2005 to till now. Contact him- apparelsoftware@gmail.com

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