Technologies
11/09/2009 The official launch of the FlashNet portal
10/20/2009 The development of the Flashnet network
09/21/2009 Tampa telecommunication tower - part of a wide-spreading project
WIMAX
The IEEE 802.16 Wireless MAN (Metropolitan Arean Network) standard was approved in January 2003, and it became a universal standard for broadband wireless access.
The 802.16 standard, named "Air Interface for Fixed Broadband Wireless Access Systems" is also known as Air Interface IEEE WirelessMAN. This technology is from the beginning designed to offer broadbandwireless access to MAN (Metropolitan Area Network) metropolitan networks, providing performances comparable to those offered by traditional cable (DSL and T1 specifications). The main advantages of the systems based on 802.16 standard include the following: extension capacity of the services, even in the areas where the cable infrastructure is difficult to implement, the avoidance of high installation costs as well as the ability of overcoming the physical limitations of the traditional cable infrastructure.

802.16 standard offers performance in both robustness and quality of the services, provided by a scalable wireless communication structure, working on a wide range and having a large capacity as every worldwide network services provider uses.
WiMax also incluses wide range access applications for household users at DSL technology level for SOHO and small companies and at T1/E1 level for companies. The provided services offer data, voice and video support and wireless access for hotspots. The details and technic specifications which differentate the certified WiMax equipments from WiFi or other technologies can be seen at their best at both standard levels, PHY level (Physical- RF transmissions) and MAC level (Media Access Control).

WiMax standard objectives

Architecturaly, the WiMax standard has been designed and developed having in view some objectives:
  1. Flexible architecture – WiMAX accepts some system architecture, including peer-to-peer and peer-to-multi-peer architecture and complete coverage.

  2. Quality of service – WiMAX can be dynamically optimized for mixing different types of traffic. Support for four types of services is provided:

    • UGS – Unsolicited Grant Service - designed to support real-time data streams consisting of fixed size data packets issued at periodic intervals of time, such as T1/E1 and VoIP
    • rtPS – Real-Time Polling Service - offers support for real-time data streams consisting of variable-size packets issued at periodic intarvals of time, such as MPEG video streams;
    • nrtPS – Non-Real-Time Pooling Service - provides support for delay tolerating data streams consisting of variable packets size, for which is required a minimum speed, such as FTP;
    • BE – Best Effort - offers support for data streams that do not require a minimum level of service and which are transmitted according to the available bandwidth limit.
  3. Quick installation – Compared with wired sollutions, the installation of WiMAX does not require significant external construction, such as modifications and eventually excavations for placement of cables. Once antenna, communication equipments and power supply are installed, WiMAX is operational. In most cases, the installing of a WiMAX network is a few hours job, compared to installing other solutions that may take months.

  4. High security – WiMax supports AES standards (Advanced Encryption Standard) and 3DES (Triple DES - Data Encryption Standard). By crypting the connections between the base station and subscriber stations, WiMAX provides subcribers the privacy and security over the broadband wireless interface. WiMAX also offers VLAN support, which ensures protection for data submitted by the different users using the same base station.

  5. Interoperability – WiMAX is based on neutral international standards. Therefore users can easely carry and use subscriber stations in different locations, connected to different service providers. Interoperability protects users investments because they can choose the equipments from different suppliers, the purchases made pay off quickly as the services are consumed by more and more subscribers.

  6. Portability – as the current cellular systems, a WiMAX subscriber station, once put into operation, it identifies, determines the contact characteristics with the base station and if the subscriber station is found in the database of the base station, it properly negociates the characteristics of the transmission.

  7. Multilevel service - The delivery way for service's quality is generally based on the agreement between the service provider and the user.

  8. Mobility – IEEE 802.16 standard has brought key features for mobility. The improvements have been done at OFDM and OFDMA physical level, providing support for equipments and services in mobile environments. The WiMAX standard has inherited the Non-Line of Sight higher performance from OFDM technology and the muti-way functioning, being through this appropriate for mobile environments.

  9. Reasonable price – WiMAX technology, based on open international standards, has a low cost, which leads to a competitive price, attractive for the end level user.




     
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