Wimax (Worldwide Interoperability Mobile Access)

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In Indonesia, WiMAX is not yet sepopuper Wi-Fi (Wireless Fidelity). But as one of the licensees WiMAX (Worldwide Interoperability Mobile Access), Indonesia has the authority to apply this telecommunication technology on mobile operators who have good preparedness infrastructure readiness and operational readiness-maintanance. WiMAX wireless broadband access are expected to provide fresh air in the midst of the telecommunications industry competition and market needs.

A little Review about WiMAX
In the session of the International Telecommunications Union (ITU) in June 2007, the WiMAX standard included in the IMT-2000. The standard is also known as third generation mobile telecommunications standard (3G) spectrum covering 2.5 to 2.69 gigahertz.
Currently undergoing WiMAX coexistence studies to ensure its status as one of the 3G technology. In fact, through his IMTAdvanced ITU standard, WiMAX is ready to be a 4G technology.
WiMAX is a wireless technology that provides broadband connection in the distance. WiMAX is a broadband technology that has high speed access and wide coverage. WiMAX is an evolution from previous BWA technology with features that are more interesting. Besides the high data rates can be given, WiMAX also brings the issue of open standards. WiMAX devices in the sense of communication between different vendors can still be done (not proprietary). With large data rates (up to 70 Mbps), WiMAX eligible applied for “last mile” broadband connections, backhaul, and high speed enterprise.
What differentiates WiMAX with Wi-Fi is a technical standard which joined in it. If the IEEE 802.11 WiFi standard combine with ETSI (European Telecommunications Standards Intitute), HiperLAN as technical standards suitable for WLAN, while WiMAX is a merger between the IEEE 802.16 standard by ETSI HiperMAN standard.
Output standard IEEE widely used in the region of origin, United States, while the output standard ETSI widespread use in Europe and surrounding areas. To make this technology can be used globally, it was created WiMAX. Both standards are technical standards combined with the correct specification is suitable for providing broadband connectivity through wireless media type or known by the BWA.

WiMAX on the Side Manufacturer or Provider
Head of General and Public Relations Directorate General of Post and Telecommunication, Gatot S. Dewa Broto confirmed, it has prepared a set of rules in the form of draft Regulation of the Minister of Communications and Informatics for the tender of BWA (broadband wireless access), which will begin in 2008. Tender is intended for equipment supporting the industry to license a single block of frequencies in the 2.3 GHz band.
Wan Yi, Director of Wireless and Mobile Communications Department at China Standards Association (CCSA), said the overall status of WiMAX will disrupt the balance of 3G mobile industry. “3G technology relies on the triangular structure of W-CDMA, CDMA, and TD-SCDMA. WiMAX will affect it massively. All major vendors of W-CDMA and CDMA oppose this, “said Wan. WiMAX is a technology that uses SOFDMA techniques, multicarrier modulation technique that uses subchannelisasi. Providers using the standard frequency for fixed subscribers (fixed) and mobile (normadic). WiMAX modulation technique is different from CDMA in which the CDMA uses different code for each customer.

WiMAX in Consumer Side
WiMAX technology can cover an area approximately 50km where hundreds of users will be shared signal and the channel for data transmission up to 155 Mbps.
In mobile applications, user WiMAX Wifi like using a terminal such as: notebooks, PDAs, and smartphones. Utilization of the same with the use of Wifi WiMAX. A terminal can detect WiMAX and WiFi networks so that users will increasingly be made easy because it can select a WiMAX broadband (WiMAX network) or wireless hotspot (for network Wifi / Wireless LAN).

Synergy WiMAX-WiFi-Cellular
Wifi (Wireless LAN) is a wireless communication network via a LAN computer. Its reach is limited to certain areas, so-called hotspots. The services provided can be varied, like LAN applications such as email, internet, intranet, messaging, music / video streaming and other IP service base.
When Wifi is combined with the implementation of WiMAX is clearly going to accelerate and expand its use, more secure because it can be a QoS (Quality of Service), more reliable, and rich in new services.
Synergies between the mobile WiMAX network combining wired and wireless, and terminal services. In general, the concept of convergence in telecommunications includes 3 aspects: devices, services, and network.
In general, introduced WiMAX as an access solution that offers multi-access, for example: WiMAX to complement the existing network (2G/3G and WiFi). The emergence of WiMax will automatically lead to competition with the 3G bearer.
3G service is mobile communication service that promises increased bandwidth of up to 384 Kbps when accessed in motion (normadic) while for the vehicle moving speed is 128 Kbps and up to 2 Mbps in a stationary state. GSM-based 3G technology (WCDMA) and CDMA (CDMA 2000). Thus the advantages of WiMAX is its speed and service that is more attractive than 3G. However, the ability mobilitynya 3G is still superior because it uses the node B which of course can cover a wider.

WiMAX Technology and Services
BWA WiMAX is a standards-based technology that enables distribution through the use of wireless broadband access as a complement to wireline. WiMAX provides last mile access for fixed, nomadic, portable and mobile unconditional LOS (NLOS) between the user and base station. WiMAX is also a BWA system that has the ability interoperabilty between different devices. WiMAX is designed to provide services Point to Multipoint (PMP) or Point to Point (PTP). With data transmission capability of up to 10 Mbps / user.
WiMAX Development in a wide range of abilities. Fixed WiMAX in principle developed from the WiFi system, so the limitations of WiFi can be completed through this system, especially in terms of coverage / distance, and guarantee quality of service (QoS). Meanwhile, Mobile WiMAX can be developed to compensate for cellular technology such as GSM, CDMA 2000 or 3G. Advantage Mobile WiMAX found on the system configuration is much simpler and the ability of data transmission is higher. Therefore, the WiMAX system is possible and easily held by a new operator or service provider a small scale.

Technology Reviews
WiMAX is a term used to describe the standards and the implementation capable of operating based on IEEE 802.16 wireless networks, like WiFi which operates based on IEEE802.11 Wireless LAN standard. However, in implementation of WiMAX is very different to WiFi.
In WiFi, as OSI Layer, is standard on the second tier, where the Media Access Control (MAC) access method of competition, ie where several terminals at the same time gaining access. While the MAC in WiMAX-based access using scheduling algorithms (scheduling algorithm). With access method of competition, then services such as Voice over IP or IPTV which depend on the Quality of Service (Quality of Service) which is stable becomes less good. While on WiMAX, where the scheduling algorithm is used, then if after a terminal to get the warranty to obtain a number of resources (such as timeslot), the wireless network will continue to provide these resources for the terminal need it.
WiMAX standard was originally designed for the range of frequency of 10 sd 66 GHz. 802.16a, updated in 2004 to 802.16-2004 (also known as 802.16d) adding the frequency range 2 to 11 GHz in the specification. Also known as 802.16d fixed WiMAX, updated again to 802.16e in 2005 (known as mobile WiMAX) and uses orthogonal frequency-division multiplexing (OFDM), which has more scalability than the 802.16d standard that uses 256 OFDM sub-carriers. Use this new OFDM provides advantages in terms of coverage, installation, power consumption, the use of the frequency and efficiency of frequency bands. WiMAX 802.16e standard has the ability to hand over or hand off, as is appropriate in mobile communications.
Number of institutions that are interested in 802.16d and .16 e standards because the standard uses a lower frequency so it is better to damping and thus have a better penetration in the building. At present, there are already commercial networks using WiMAX-certified device in accordance with the standard 802 162.
WiMAX specifications led to an improvement over the limitations of WiFi standards by providing greater bandwidth and better encryption. WiMAX standard provides connectivity without the need for Line of Sight (LOS) in certain situations. Non-LOS propagation requires a standard .16 16.e d or revision, because it requires a lower frequency. Also, it should be used in muli-path signals (multi-path signals), as the 802.16n standard.

First 4G WiMAX operator in Indonesia
Sitra 4G WiMAX WiMAX is the first operator in Indonesia to launch 4G Wireless Broadband service in June 2010. Sitra WiMAX is part of the Lippo Group and the latest trademark of PT. Firstmedia language. Sitra WiMAX 4G Wireless Broadband will serve first in Indonesia in densely populated areas and at the same time have the right of BWA license coverage the most expensive is in Jakarta, Bogor, Depok, Tangerang, Bekasi, Banten Province, North Sumatra and Aceh Province.


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