Telecommunications Network Planning in A Multi-Operator Environment

A. H. M. Shafiqul Islam.Director. BTTB

1. Key elements of Network Planning

• Data collection and supervision of the network to determine its status.
• Forecasting of number of subscribers, traffic and traffic interest per subscriber.
• Total traffic showing in traffic matrices.
• Fundamental technical planning.
• Dimensioning of the network
• Financial analysis.
Net work planning in a turbulent environment (multi operator & multi service) requires additional decision data. The following areas are affected
• The market, what will be the operators future role in a market exposed to severe competition.
• Customer demands diversification; diversified customer demand with services like Internet, multimedia, entertainment services and mobility etc. must be taken into account.
• Changes in technology, new technologies like ATM (Asynchronous Transfer Mode), IPPSTN (Internet Protocol Public Switched Telephone Network) and further development of existing technology may require attention.
• Standard, new standard are issued continuously.
• Pricing & cost analysis, wide fluctuations of pricing and costing in different parts of the network may be happened due to utilization of alternative technology, routes and operator etc.

2. Evolution of Network configuration Bangladesh in 1999 and 2002

The total capacity of 627 telephone exchanges is 474,322 lines. Telephone exchanges are of different type like digital, analog and manual. Long distance transmission system are based on radio links out of which very few are with digital PDH radio.
By the year 2002 another 467,450 digital telephone lines will be added in the country. out of which 310,150 lines will be expansion and 157,300 lines will be replacement. By year 2002 all district towns will have digital telephone exchanges interconnecting among themselves by digital transmission links (OFC or radio) TAX I sub-TAX will be added at 11 more cities/towns giving opportunities to increase P01 (point of interconnection) with private operators.
BTTB is major telecom operator in the country. Two (2) numbers private operators are working as rural telephone operator and four (4) number private operators are working as cellular mobile operator. The provision for P01 (Point of Interconnection) between BTTB and private operators are kept at ITX, TAX and Tandem exchanges. List of cities/towns along with number of POIs as in 1999 and as envisaged in 2002 are shown in the next table.

Besides these there will he PCI (TAX) at Barisal, Comilla, Kushtia, Myrnensingh, Rangamati, Noakhali, Faridpur, Jessore, Dinajpur, Rangpur & Pabna by the year 2002. At present total P01 (ITX) = 3 and PCI (TAX) = 9, which will he PCI (ITX)= 2, POT (TAX)=
21 and tandem= 3 by the year 2002.
Requirement of Changes in Fundamental Technical planning (FTP)

3.1 Numbering Plan

3.1.1 Present status. First digits of national significant numbers in use are.
First digit - 1. mobile service (presently 11, 17, 18, 19 are allocated)
First digit-2 to 9, are allocated for geographical services for Dhaka, Chittagong, Khulna, Bogra, Southern Dhaka, Rajshahi, Sylhet and Mymensingh. Therefore no first digit of national significant number is left free for introduction of any major new service or new operator etc.
Geographical area codes are varied from one to four digits and local numbers from three to seven digits.
Rural operators are sharing the same geographical codes with BTTB.
First digit of Dhaka City exchange code are now 2, 3, 4, 5, 6, 7, 8 and 9. Hence there is little opportunity to allocate exchange code for a new incumbent telecom operator in Dhaka. Utilization of 7 digit codes of Dl city is very poor

3.1.2 Future proposition. Some measures can taken by clearing few first national significant digits from use of geographical identification in order to keep them free for cautiously use non-geographic service is in future. BTTB and Rural telephone operator will careful about choosing first digit of individual exchange codes. After closing all analog exchanges in Dl few first digits of existing exchange number will be free, those are 2, 3,4, 5, and 6. TI should be kept free to use as access codes new IN (Intelligent Network) services to be introduced in future.

3.2 Transmission Plan

3.2.1 Present status. Existing national transmission systems are analog and digital I radio systems. Transmission plans are a’ able accordingly.

3.2.2 Future proposition. After year 2002 national transmission systems covering all district towns will be on SDH multiplexing on cal fiber link and digital microwave (SDI PDH) links, Bandwidth will be high, suit to band width bearing capacity of the pre days demand for multimedia services multi operator environment. New transmission plan will be set up to meet the new criteria of services.

3.3 Routing Plan

3.3.1 Present status. Exiting national transmission networks are on star format, having limited bandwidth. Therefore, limited seal alternative routing provisions are now a’ able, which causes lesser reliability. multi operator environment sometime it happens that one operator blames the other for not availing service reliability.
3.3.2 Future proposition. Future national transmission network will have wider band width, and it will form few rings in northern and southern part of the country, more over number of TAX/sub TAX will also increase. Therefore, after the year 2002, provisions for more alternative routing could be kept in order to obtain better service reliability.

3.4 Signaling Plan.

3.4.1 Present Status. Existing national signaling systems are now done by R2 and CCS7. For international service it is CAS 5. Different telecom operators are connected with BTTB with R2 and C7. National signaling plans has not so far been established in detail.
3.4.2 Future proposition. After the year 2002, the national network will mostly be converted to digital and at that time signaling system will also mostly be CCS7. It would be necessary to set up a national, signaling plan before the country’s signaling network become more complex in the multi operator environment. BTTB has a plan to install STP (Signal Transfer Point) to ease the handling of complex signaling network.

3.5 Charging Plan.

3.5.1 Present status. BTTB has a charging plan, stipulating for what subscribers should pay for, how much they should pay, and the basis for charging.

3.5.2 Future proposition. In future service offering by BTTB can be wholly or partly exposed to fierce competition. Moreover in the multi operator environment inter operator revenue/tariff-sharing matter has come as a part of charging plan. Regarding inter operator billing & revenue collection there should be provisions of bulk billing. Further to that, the billing system may be based on individual calls or based on average traffic profile. In the case of average traffic profile, the billing may be based on representative traffic observation carried out periodically. Periodicity depends on the basis of changes of traffic profile. For the fast changing traffic profile, frequent measurement is required, usually once in six months.
3.6 Frequency plan.

3.6.1 Present status. Frequency planning was earlier a part of BTTB’s responsibility. It is now under the Ministry of Posts and telecommunication (MOPT) responsibility until the formation of TRC (Telecom Regulatory Commission).

3.6.2 Future Proposition. Frequency utilization is increasing day by day for new competitive services of cellular Mobile service, WLL (Wireless Local Loop) service etc. As there are four mobile operators, therefore use of frequency has become quadruplicated,
where as there is scarcity of availability offrequency.

4. Conclusion

Following recommendations for BTTB may be considered necessary to ensure good
network planning in a multi operator environment • There should be precise data base related to statistical, traffic, technical, pricing and costmanagement.
• There should be a good set up in planning wing for traffic engineering and fundamentaltechnical planning.
• There should be modern cost management set up in BTTB.
• There should be a permanent BTTB liaison office for co-ordination with private telecommunication operators.