WiMAX (Worldwide Interoperability for Microwave Access) - the name of wireless standards IEEE 802.16 (IEEE - Institute of Electrical and Electronics Engineers), which support a massive broadband access to remote networks (including the Internet).Today they presented 802.16d-2004 and 802.16e-2005.
Physically Mobile WiMAX uses OFDMA (multiple access orthogonal frequency subcarriers) - the most perfect present for spectral efficiency, bandwidth, latency, and advanced technologies anntennyh MIMO.The link layer protocol it uses modern data protection and principles of quality of service (QoS);supported web logging (IP).
Since 2001, consolidating the center of innovation in the new technology performs WiMAX Forum.The participants are fighting for the compatibility of base stations and subscriber equipment.WiMAX Forum working groups are developing so-called "profiles" to match the parameters of the hardware specifications of the decisions taken, as well as special tests.Since 2008, the efforts of WiMAX For
This year, the working group WP5D the International Telecommunication Union (ITU) analyzes the LTE technology and WiMAX2 as candidates for inclusion in the group of IMT-Advanced (4G).The basic protocol technology WiMAX2 became standard IEEE 802.16m, the final version of which shall be approved by the summer of 2010. It involves the use of a channel width of 20 MHz in addition to the existing, which increases its efficiency.It is important to emphasize that the technology 802.16m system supports all profiles of WiMAX Forum, ensuring compatibility with 802.16e-2005.
Today there are more than 100 networks WiMAX.Among the operators that deploy them, there are service providers to access the second and third generation (2G / 3G), fixed-line and virtual operators (MVNO).Their bizes models are different, but they are all based on the merits of WiMAX:
- High performance
by Spectral efficiency of OFDMA technology and support for advanced antenna technology;
flexibility in the use of different models, including fixed and mobile access to a common infrastructure, and the use of networks operating in different frequency bands;
- Advanced logging (IP)
supporting IMS, allowing you to quickly and at no additional cost to deploy new services, as well as provide integration with the networks 3G; attractive economics,
based on scalable solutions, low-cost infrastructure and the absence of dominant players among the holders of intellectual property rights.
largest network of mobile WiMAX
- Clearwire (XOHM), 2,5 GHz (Baltimore, USA);
- Scartel (Yota), 2,5 GHz (St. Petersburg and Moscow, Russia);
- «Comstar", 2.5 GHz (Moscow, Russia);
- UQ, 2,5 GHz (Japan);
- VMAX, 2,5 GHz (Taiwan);
- PacketOne, 2,3 GHz (Malaysia);
- QMAX, 2,5 GHz (Singapore);
- Freshtel, 3,5 GHz (Ukraine, Russia)
The Russian mobile WiMAX enabled SCR in the range of 2.3-2.4 GHz 2,5-2,69 GHz.In the bottom half of the range (and 3,4-3,45 3,5-3,55 GHz) certified fixed networks WiMAX, but work is underway to explore the possibilities of mobile services.Given the fact that the range of 2.3-2.4 GHz was allowed only for mobile access to the latest solutions HRS, the largest Russian operators using WiMAX 2.5 GHz.