MODERN TRANSPORT PROTOCOLS 802.16 (WIMAX)

Modern Transport protocols 802.16 (WiMax)

Modern Transport protocols 802.16 (WiMax)

Introduction

We already have several years talking about connections Wi-Fi, a technology wireless in its different versions (802.11a, b and g) can provide transfers from 11 to 54 Mbps, found in so-called Wi-Fi hotspots in hotels, airports, stations service, convention centres and trade, among others, providing access to Internet, often free.

However, these Wi-Fi hotspots still remain several limitations, including low radio coverage of a few hundred meters. But the reality is that these limitations for users of laptops and PDAs can come to an end with the new technology WiMax (Pappalardo, 2007, 20).

Over the past few years have raised expectations and realities about the access of wide band -edge. The wiring is the high cost of installation is not always tended to justify their rural or geographically inaccessible. Bringing services ADSL to these areas is not cost effective for operators of telephony. The traditional cable operator is still in the process of transition to the transport of data, and cellular technology only allows rates of speed limited.

These and other technological and topographical constraints, coupled with the rapid adoption of Internet access, have motivated the development of this new wireless standard called WiMax (www.itu.org).

WiMax is an acronym in English for Worldwide Interoperability for Microwave Access, whose translation to Spanish is Worldwide Interoperability for Microwave Access. WiMax is a standard transmission waves of radio art that allows reception of data by microwave and radio wave relay. WiMax is defined under 802.16 MAN standard, a protocol for networks of metropolitan areas, providing concurrent access to multiple overlapping signal repeaters, offering total average coverage of 50 km radius and speeds up to 124 Mbps is necessary to establish a small differentiation protocol, since we have the 802.16d standard for fixed terminals and stations in 802.16e for movement. This marks a distinction in the way of using this protocol, although the ideal is to use a combination of both. This technology does not require a direct view or be in a straight line with the base stations (Perera, 2007, 57-58).

WiMax was established as a brand, which is held by the device communication which is subject rotate with said IEEE 802.16 MAN. WiMax significantly exceeds its counterpart protocol Wi-Fi, which provides radio coverage to 100 meters maximum transfer rates of 54 Mbps is worth mentioning that WiMax is compatible with previous standards, such as the ubiquitous Wi-Fi (IEEE 802.11).

WiMax is designed as an alternative to access wireless broadband DSL and cable, and a way to connect Wi-Fi nodes in a network of the metropolitan area. Thus, WiMax could soon become the basis for metropolitan access networks Internet, serving as a support to facilitate connections in rural areas, and used in the business world to implement the communications within (Schwartz, 2005, 12).

Operation of WiMax

In practical terms, WiMAX would operate in a manner similar to WiFi but at higher speed, more distance and a larger number of users. Could cover the urban and rural areas considered “blind” ...