Assignment : WiMAX VoIP Solution– A Cost-Efficient Way of Communication




              Prepared For:
          Dr. Mash...
WiMAX VoIP Solution– A Cost-Efficient Way of Communication

Riaz Rahman , North South University, Dhaka, Bangladesh.
E-mai...
meters. Wimax standards are still under discussion, however. The standard for fixed
terminals is the most advanced, but ot...
year effort to develop this new standard, culminating in final approval of the 802.16a Air-
Interface Specification in Jan...
long range, high capacity "last mile" wireless communications for carriers and service
providers around the world.
In WiMA...
V.      PROPOSED WiMAX VoIP PLANNING FOR
           BANGLADESH


Bangladesh has a lot of opportunities to use WiMAX VoIP t...
Fig. 2. The proposed service infrastructure showing the control center with six divisional
cities along with the districts...
industries are Dhaka (Capital of Bangladesh) centered. So VoIP over WiMAX is the best
solution for deployment of garment s...
REFERENCES


[1] http://www.huawei.com
[2] http://www.tmcnet.com
[3] http://www.wimax.com
[4] http://www.techweb.com
[5] h...
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Riaz Rahman (072878056)

  1. 1. Assignment : WiMAX VoIP Solution– A Cost-Efficient Way of Communication Prepared For: Dr. Mashiur Rahman North South University, Dhaka. Prepared By: Riaz Rahman ID: 072878056 Course: MSETE-605 Sec-2
  2. 2. WiMAX VoIP Solution– A Cost-Efficient Way of Communication Riaz Rahman , North South University, Dhaka, Bangladesh. E-mail- reaz.rahman@gmail.com Abstract— With the fast development of the global WiMAX market, how to provide the same service experience to the traditional telecom domain on WiMAX network becomes a principal problem.Voice over IP is an important application drive for WiMAX adoption, as voice has become a powerful tool when it is enabled across a wireless platform. Voice over WiMAX has requirements on a high degree of mobility, wireless access, and quality service. What is really interesting about WiMAX VoIP is that it offers a cost structure potentially. VoIP and WiMAX are converging toward a powerful wireless voice solution for the individual, family, or enterprise applications. I. INTRODUCTION In most networks, voice traffic travels over a public switched telephone network (PSTN), while workstation and application data travels over an IP-based wide area network (WAN). However, converged network carries both traditional data such as e-mail, FTP, and business applications, as well as voice traffic such as telephone calls, teleconferences, and voice mail. Most data networks use the Internet Protocol (IP) as the networking standard for connecting their LANs and WANs. Voice traffic carried by an IP-based network is referred to as Voice over IP (VoIP). WiMAX, or Worldwide Interoperability of Microwave Access, is a wireless Internet service designed to cover wide geographical areas serving large numbers of users at low cost. WiMAX is the synonym given to the IEEE 802.16 standard defining wide area wireless data networking. WiMAX is the standard being adopted worldwide by manufacturers to insure inter-operability of equipment. WiMAX is considered one of the best solutions for “last mile” distribution. Wimax is an emerging wireless networking technology that offers the potential for higher data rates than wireless LAN technologies such as Wi-Fi -- and over much greater distances: tens of kilometers, instead of tens of
  3. 3. meters. Wimax standards are still under discussion, however. The standard for fixed terminals is the most advanced, but other standards for portable and mobile terminals are also in development. A WiMAX infrastructure will let service providers deliver VoIP to rural areas without a backhoe. WiMAX technology to provide VoIP and data services to rural areas to avoid local access charges.VoIP over WiMAX is attractive for both enterprises and carriers, but challenges remain. The initial WiMAX equipment will be certified in the 2.5- and 3.5- GHz spectrum ranges. The 2.5-GHz spectrum is owned largely by Sprint and Nextel, while the 3.5-GHz spectrum is not available for use in the United States. This means that any near-term WiMAX equipment deployment will likely use unlicensed spectrum, which carries the risk of interference from other wireless devices. VoIP over WiMAX can be made reliable and cost-effective. II. Benefit of WiMAX VoIP WiMAX delivers a cost-effective alternative to broadband access. Since many businesses, organizations and communities are not zoned for cable, the local telecom company provides the only option for broadband service. The ease of deployment for WiMAX systems can benefit customers by bringing new competition into the marketplace and lowering prices, or by enabling enterprises and higher-educational institutions to set up their own private networks. The added benefit that remote WiMAX VoIP users need less or no on-site installation significantly reduces the cost and set-up time of delivering the service, allowing it to favorably compete with existing cable or other wired solutions. III. WiMAX VoIP INFRASTRUCTURE A new, more complex and fully developed standard would be required to address both the physical layer environment (outdoor versus indoor RF transmissions) and the Quality of Service (QoS) needs demanded by VoIP over WiMAX.The IEEE conducted a multi-
  4. 4. year effort to develop this new standard, culminating in final approval of the 802.16a Air- Interface Specification in January 2003. This standard has since received broad industry support from leading equipment makers. Many WiMAX company members are active in both the IEEE 802.16 standards development and the IEEE 802.11 efforts for VoIP over WiMAX, and envision the combination of 802.16a and 802.11 creating a complete wireless solution for delivering high speed Internet access to businesses, homes, and WiFi hot spots. Fig.1. WiMAX VoIP infrastructure Acronyms and Abbreviations AAA: Authentication, Authorization and Accounting PSTN: Public Switched Telephone Network ASN: Access Service Network QoS: Quality of Service ASN-GW: Access Service Network Gateway RRM: Radio Resource Management BS: Base Station VLAN: Virtual Local Area Network CSN: Connectivity Service Network VoIP: Voice over IP FA: Frequent Assignment VPN: Virtual Private Network IP: Internet Protocol Wi-Fi: Wireless Fidelity IPSec: IP Security Protocol LAN: Local Area Network WiMAX: Worldwide Interoperability for Microwave Access Forum The 802.16a standard delivers carrierclass performance in terms of robustness and QoS and has been designed from the ground up to deliver a suite of services over a scalable,
  5. 5. long range, high capacity "last mile" wireless communications for carriers and service providers around the world. In WiMAX VoIP, applications include residential broadband access-- DSL-level service for SOHO and small businesses, T1/E1 level service for enterprise, all supporting data, voice and video as well, wireless backhaul for hotspots and cellular tower backhaul service to name a few. In reviewing the standard, the technical details and features that differentiate WiMAX certified equipment from WiFi or other technologies can best be illustrated by focusing on the two layers addressed in the standard, the physical (PHY) or RF transmissions and the media access control (MAC) layer design. IV. IMPLEMENTION OF WiMAX VoIP In 2004, Ertach deployed “The First WiMAX Network in Latin America,” providing internet access, data transmission, and Voice over Internet Protocol (VoIP) with the standard 802.16d. Another important milestone for Ertach was the launch of the first Portable Broadband Network in Latin America with WiMAX Technology in August 2006. The network was launched in the city of Carlos Casares, providing broadband internet access and VoIP to one of the largest agro-business company in Argentina and to remote communities and enterprises in rural and suburban areas.The company has invested more than US$23 million in the development and continuous expansion of its WiMAX network countrywide. VoIP over Pre-WiMAX has been successfully tested in a trial in South Africa utilizing solutions supplied by Verso Technologies and Saab Grintek Technologies. The trials involved Wi-Fi-compatible PDAs obtaining access to the public switched telephone network (PSTN) via customer premise gateways. Backhauling of WiMAX technology to an existing Telkom South Africa was accomplished through customer premise gateways. Softswitching and gateway technologies were used to deploy the test.
  6. 6. V. PROPOSED WiMAX VoIP PLANNING FOR BANGLADESH Bangladesh has a lot of opportunities to use WiMAX VoIP to provide better and cost effective services in health care sector, telemedicine, agriculture sector, interviews for job, audio-visual conferences in public and private organization, computer training, e- commerce, garments sector, banks, public exams etc. These services will mostly help the poor people living in the rural area. Some multi purpose service centers are needed to be established in different places all over the country. In these service center most of the above services can be provided. The target country Bangladesh is divided into six divisions. Initially six service centers can be established in six divisional head quarters. Later district, union and thana level can be brought under this system. All of the service centers will be connected to each other through a control center (Star topology). Later the network could be expanded up to thana level to make the system more convenient and effective. Figure 2 illustrates the infrastructure of the network system. The control center will be responsible for the task allocation and overall management of the service centers. High speed communication is very essential between the control center and the service centers. Existing Fiber optic backbone throughout Bangladesh could provide a very high bandwidth communication between the control center and the service centers. Service centers should have all the cutting edge facilities of the modern technology. Each center will be equipped with modern VoIP equipment. One center may contain about 100 personal computers connected on LAN fashion, Internet, database server, audio-visual facilities etc. Fig. 3 illustrates the typical configuration of an service center. The divisional service centers could act as the control center for all the districts under the division. The centers under one division will form a LAN to communicate with each other. The medium of the LAN will depend on the terrain and environmental conditions. Several alternatives, such as ADSL, 3G wireless, LMDS exist. It is believed that WiMAX can provide an excellent solution for last-mile distribution with speeds up to tens of Mbps. Generally, the microwave link will be more preferable than the VSAT link because of the cost- effectiveness.
  7. 7. Fig. 2. The proposed service infrastructure showing the control center with six divisional cities along with the districts under them The service centers could provide a number of services to the citizens of the country. The service centers can promote development of telemedicine network in Bangladesh, establishment of a virtual medical library, computer literacy programs for medical professionals and health training for mass people. These centers could be used for various technical training and educational purposes. Young people can be trained to develop professional software, as the global software market is open for all, these people can sell their software globally. About 50% population of Bangladesh are women but their contribution in national development is significantly low. The government already took some steps to improve these conditions. service centers can also be a part of these improvements. These centers can be used to train women and help them to become effective human resource for the country. Service centers can be used on this purpose also. Garment sector of the country has now become an over 2.5-billion-dollar-foreign- exchange-earner, enjoying the status of 5th largest garment exporter and largest shirt and T-shirt exporter to the EU and 6th largest apparel exporter to USA. Bangladesh now exports ready-made garments to as many as 30 countries of the world with EU as the major importer, followed by USA, the largest importing country. Most of the garment
  8. 8. industries are Dhaka (Capital of Bangladesh) centered. So VoIP over WiMAX is the best solution for deployment of garment sector rural areas of the country for national communication and international communication between importer and exporter. Fig. 4: Service center configuration. V. CONCLUSIONS In this paper, a cost effective WiMAX VoIP infrastructure has been proposed. Ultimately, the technical challenges can be addressed and the market opportunity for WiMAX VoIP service can then begin to develop in Bangladesh.
  9. 9. REFERENCES [1] http://www.huawei.com [2] http://www.tmcnet.com [3] http://www.wimax.com [4] http://www.techweb.com [5] http://www.bangladeshonline.com [6] Text Book: VoIP for Dummies [7] Text Book: Voice over IP technologies- Mark A. Miller, P.E

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