Overview
Until now, wireless Internet users (wireless) has been created will be curious about the emergence of WiMAX technology (Worldwide Interoperability for Microwave Access). WiMAX is an evolution of earlier wireless broadband technologies. The technology is designed to meet the conditions of non-LOS (Line of Sight) for using OFDM techniques.
Like WiFi, WiMAX enables wireless Internet connection,
with speeds of 70 megabits per second or 35 times faster than
ADSL channel.
Technically, the new standard called 802.16, also have coverage
to tens of kilometers compared with WiFi capability that only hundreds of
meters.
Up to this writing WiMAX is still a new thing. The following article is a good glimpse WiMAX technology viewed from the side, configuration, standards and challenges.

WiMAX Technology Position
If the previous Wireless broadband technology is still proprietary, it will be open WiMAX standards (like GSM and CDMA mobile communications and WLAN IEEE 802.11 standards).
Many wireless technologies (wireless) which has been held in the field such as cellular (GSM or CDMA), Broadband Wireless Access (Wireless IP or Wireless DSL), Wireless LAN (standard 802.11 a / b / g), and Wireless PAN (Bluetooth or RFID) .
Position if it is related to WiMAX technology, referred to can be described as follows:

figure1

Figure 1. WiMAX Technology Position

WiMAX technology is also promising features that can compete with the standard ASDL and third-generation mobile phone (3G).
According to the report view Telecom, WiMAX will take approximately 40% of broadband wireless market in 2009. At the same time, WiMAX will be a major competitor for the third generation mobile (3G) which will control 60% of the broadband wireless market at the same time.

Configuration
WiMAX configuration generally divided into 3 parts ie subscriber stations, base station and the transport site. For the subscriber station is located in the customer environment (can be fixed or mobile / portable). While the base station is usually a single location with the operator’s network (IP network / Internet or TDM / PSTN).
To clarify the intended configuration, then the following picture (Figure 2) is a generic configuration of WiMAX

Figure 2. Configuring Generic WiMAX

This type of multiple interfaces is as follows

Interface	Type
I / F – 1	Air Interface / OFDM
I / F – 2	10/100 Base T, E1
I / F – 3	10/100 Base T, E1
I / F – 4	E1

 

 

 

 

 

 

Table 1. WiMAX interface

Standard
WiMAX. is a standardization body (forum) who served two standard compromise Wirelesss MAN (between the IEEE 802.16 standard by ETSI HiperMAN). This is similar to the WiFi standard that combines the IEEE 802.11 standards (United States) with ETSI HiperLAN (Europe), where the application is suitable for Wireless LAN.
There is a variant of the WiMAX standard IEEE 802.16d (802.16 2004) for the category of fixed applications (portable) and IEEE 802.16e for mobile application category.
We have a new IEEE 802.16 standard approved in 2004, where the characteristics of water-based interface standards are as follows: 

Desgnation	Appplicability	Duplexing Alternative
WirelessMAN-SC	10 – 66 GHz	TDDFDD
WirelessMAN-Sca	Below 11 GHz licensed bands	TDDFDD
WirelessMAN-OFDM	Below 11 GHz licensed bands	TDDFDD
WirelessMAN-OFDMA	Below 11 GHz licensed bands	TDDFDD
WirelessHUMAN	Below 11 GHz licensed-exempt bands	TDD

Table 2. Air Interface IEEE 802.16 WiMAX standard in 2004

For standard WiMAX 802.11e (mobile applications) will be issued a new possibility in 2006.
Challenges

In the process, there are some challenges / obstacles related to technology and WiMAX devices in question. Dalah challenge as follows:
 

• Readiness device
  Since certification WiMAX (802.16 in 2004) will be done in July 2005, so far this writing there is no vendor that has a device that Comply with WiMAX certified. However, there are several vendors that have been prepared with pre WiMAXnya device (in the sense of living alone software upgrade to Comply with WiMAX).

 

•  Government Rules
  As happened with other countries in the world, the Indonesian government had yet to determine the frequency of WiMAX will be used. Most likely the first vendor to make WiMAX devices in the 3.5 GHz frequency. While in Indonesia, the frequency is also used for satellite communications. Thus necessary to determine the appropriate frequency range to good advantage for operators, regulators and users.

 

Conclusion
From the above description can dtarik the following conclusion:

• With the advent of WiMAX, it is very profitable for vendors, operators and regulators 
• WiMAX will be a complement as well§ as a new challenger, especially on existing wireless technologies
• The need to quickly set up for determining the frequency of WiMAX in Indonesia because it will affect the success or failure forward deployment of WiMAXBibliography
  1. WiMAX standard (IEEE 802.16 2004)
  2. Standard System WiMAX, Telkom RisTI
  3. www.wimaxforum.org
  4. www.airspan.com
  5. www.alvarion.com
  6. Various sources on the Internet