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Chitamu & Mwakabaga5th International Confernence on Open Access1 The Impact of Radio Channel Variability on Broadband Throughput Rates in Different Parts.

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Presentation on theme: "Chitamu & Mwakabaga5th International Confernence on Open Access1 The Impact of Radio Channel Variability on Broadband Throughput Rates in Different Parts."— Presentation transcript:

1 Chitamu & Mwakabaga5th International Confernence on Open Access1 The Impact of Radio Channel Variability on Broadband Throughput Rates in Different Parts of Tanzania by Peter Chitamu and Teddy Mwakabaga Centre for Telecommunications Access and Services School of Electrical & Information Eng. The University of the Witwatersrand, Johannesburg Tel: Web: School of Electrical and Information Engineering University of the Witwatersrand, Johannesburg 5 th International Conference on Open Access Paradise Holiday Resort, Bagamoyo, Tanzania November 2007

2 Chitamu & Mwakabaga5th International Confernence on Open Access2 Outline Introduction Problem statement –Underlying network capabilities for ICT Services –Prevailing conditions in Tanzania –System Modelling Results and Discussions Summary & Conclusions

3 Chitamu & Mwakabaga5th International Confernence on Open Access3 ICT Services What has Changed?

4 Chitamu & Mwakabaga5th International Confernence on Open Access4 Connectivity Challenges ICT services require different underlying network capabilities –Capacity (Number of simultaneous connections) –Reach / Coverage –Throughput (bps) Other considerations based on above –Transmission errors –Connection delays (Network latency)

5 Chitamu & Mwakabaga5th International Confernence on Open Access5 Multimedia Connectivity for the new User PSTNPSTN Interne t (IPnet) (IPnet) Multi- Servic e Net Net Personal Multimedia Gateway GlobalConnectivity&ContentDistribution ? Residential or SOHO MonitoringStation

6 Chitamu & Mwakabaga5th International Confernence on Open Access6 Fixed-Mobile Access Configurations Example 802.1x Hot Spot Operator Network Tele-Working SOHO

7 Chitamu & Mwakabaga5th International Confernence on Open Access7 Convergence (Integrated) Services ICT Services require a flexible network to cope with wide ranging requirements

8 Chitamu & Mwakabaga5th International Confernence on Open Access8 ProvidedService FDDespecially Suited for Symmetrical Services and Wide area coverage TDDespecially Suited for Asymmetrical Services and small area coverage FDD / TDD 10 kbps 100 kbps 1 Mbps 10 Mbps Voice Data Base Access Information Services Tele-banking Financial Services Video Conferencing Electronic Newspaper Images / Soundfiles Tele-shopping Video Telephony Question: Who needs what ?

9 Chitamu & Mwakabaga5th International Confernence on Open Access9 Lea Skorin-Kapov, etal,Analysis of End-to-End QoS for Networked Virtual Reality Services in UMTS, IEEE Comms. Mag. April 2004, pp Main Classification is Error and Latency Tolerance

10 Chitamu & Mwakabaga5th International Confernence on Open Access10 Telecomms. Connectivity Major Events Voice on PSTN Data on PDSN Broadcasting Fixed-Line 1986 Fixed-Line Mobile (1G) (More fixed) 1991 Fixed-Line Mobile (1G & 2G) (Fixed declining) Voice on PSTN Voice on 1G Data on PDSN Broadcasting Inter-working PSTN & PDSN (Packet & Circuit Switching) Broadcasting 2002 Fixed-Line Mobile (2G & 3G) (More Mobile) Convergence PSTN & PDSN Broadcasting (Limited) All-IP 2006 Separate Voice from Data Paradigm Multimedia Communication Fixed & Mobile Convergence

11 Chitamu & Mwakabaga5th International Confernence on Open Access11 Problem Statement

12 Chitamu & Mwakabaga5th International Confernence on Open Access12 What is the problem? Coverage –Different operating areas impose different coverage requirements –For low density users and hilly areas, operators has to build many sites to meet coverage requirements which increases cost of service provision Data Rates –Achievable data rates in an area are directly linked to the quality of the reception

13 Chitamu & Mwakabaga5th International Confernence on Open Access13 Problem: How to guarantee high data rates over large coverage area

14 Chitamu & Mwakabaga5th International Confernence on Open Access14 M El-Sayed and J Jaffe, A View of Telecomms. Network Evolution, IEEE Comms. Mag., Dec 2002, pp

15 Chitamu & Mwakabaga5th International Confernence on Open Access15 System Modelling

16 Chitamu & Mwakabaga5th International Confernence on Open Access16 Understanding of operating environments in Tanzania Propagation measurement campaign carried out –Path loss models in representative areas of Tanzania –Multipath delay spread –Dense Urban, Urban, Sub-Urban, and Rural This information used to investigate how operating environment will impact on the currently broadband access networks –iBurst, cdma2000 EV-DO and UMTS - HSDPA

17 Chitamu & Mwakabaga5th International Confernence on Open Access17 Link Budget vs Data Rate P T (max) P T (min) P R (max) P R (min) Distance Dynamic Range Quality of Received Signal

18 Chitamu & Mwakabaga5th International Confernence on Open Access18 Example: Propagation Environments Mombo Soni Ngudu, Mwanza Njombe

19 Chitamu & Mwakabaga5th International Confernence on Open Access19 Operating Environments make certain technologies very expensive to use outside Cities

20 Chitamu & Mwakabaga5th International Confernence on Open Access20 Scatter Plots

21 Chitamu & Mwakabaga5th International Confernence on Open Access21 Multipath selected Results -6 dB

22 Chitamu & Mwakabaga5th International Confernence on Open Access22 Multipath selected Results -6 dB

23 Chitamu & Mwakabaga5th International Confernence on Open Access23 Multipath selected Results Pre-Cursors and Post-cursors Nearby echos and a group from far

24 Chitamu & Mwakabaga5th International Confernence on Open Access24 Average path loss profiles Flat terrain with light vegetation (e.g. Mwanza) Undulating landscape, with moderate vegetation (e.g. Njombe, Iringa, many parts of Morogoro) Hilly and heavily forested (Lushoto, USA River) PL(d) [dB] = PL(do) + 10 n MF log(d/do) + σ

25 Chitamu & Mwakabaga5th International Confernence on Open Access25 Results & Discussions

26 Chitamu & Mwakabaga5th International Confernence on Open Access26 Assumptions Networks not loaded to influence coverage Use average path loss models from propagation measurements Target BER of at least for data rate of 500 kbps and 1.5 Mbps No link improvements through diversity, adaptive modulation, etc Only physical network speed as influenced by E b /N o specification and no flow or error control mechanisms applied

27 Chitamu & Mwakabaga5th International Confernence on Open Access27 Impact of Data Rate Variability

28 Chitamu & Mwakabaga5th International Confernence on Open Access28 EV-DO at 800 MHz

29 Chitamu & Mwakabaga5th International Confernence on Open Access29 iBurst at 1790 MHz

30 Chitamu & Mwakabaga5th International Confernence on Open Access30 HSDPA at 2100 MHz

31 Chitamu & Mwakabaga5th International Confernence on Open Access31 Summary To make ICT Services widely accessible, the issue of connectivity platforms needs to be carefully considered –Tanzanian market is cost conscious Understanding of the operating environments enable network designers to optimised Coverage, Capacity and throughput to meet the requirements for the wide range of ICT services Tanzania operating environment are mostly coverage limited with users in undulating and hilly terrain. –More work needs to be done to understand how operating environments influence both cost and type of ICT services that can be cost-effectively offered in different areas of Tanzania


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