POSDATA Mobile WiMAX, FLYVO


15	What are the key elements of WiMAX technology?
A key differentiator for WiMAX is the interoperability of WiMAX Forum Certified equipment, resulting in mass volume economy of scale and assurance for service providers that equipment from different vendors is compatible and interoperable. The WiMAX Forum has assembled an alliance of more than 530 leading companies in the communications and computing industries to drive a common platform for the global deployment of IP-based broadband wireless services. Other key elements include cost, coverage, capacity and standards for both fixed and mobile wireless usage models. 1. Lower cost A standards based platform for WiMAX technology drives down costs and delivers volume economics WiMAX equipment. 2. Wider coverage The technology behind WiMAX has been optimized to provide excellent non-line-of-sight (NLoS) coverage. NLoS advantages are coverage of wider areas, better predictability of coverage and lower cost as it means fewer base stations and backhaul, simple RF planning, shorter towers and faster CPE install times. Thanks to techniques for improving NLoS coverage, such as antenna diversity, MIMO, space-time coding, and Automatic Retransmission Request (ARQ), coverage and signal reliability are increased. 3. Higher capacity A key advantage of WiMAX technology is the use of Orthogonal Frequency-Division Multiplexing (OFDM) over CDMA which is used in older technologies like Edge, GPRS, and HSPA. OFDM delivers higher spectral efficiency and therefore higher data rate and overall system capacity.Adaptive modulation also increases link reliability for carrier-class operation and the possibility to keep higher order modulation at longer range, extend the total capacity of the network. 4. Standard for all usage models (fixed to mobile) The WiMAX technology was designed to become the most cost-effective solution for carriers for any usage model from fixed to mobile. Newer versions of the WiMAX standard support higher speeds of mobility and always maintain backward compatibility with previous Mobile WiMAX releases. [source : WiMAX Forum]

14	Have you ever been awarded certification by WiMAX Forum?
POSDATA FLYVO was awarded Mobile WiMAX™ Certification by WiMAX Forum for a base staion and user device (USB modem) in April and September 2008.

13	Does FLYVO has commercial site?
YES. FLYVO deployed its mobile WiMAX system in Singapore QMAX, Uzbekistan Super-iMAX and Korea Telecom. In addition to it, FLYVO has drwan commercial contract with Airway in China, Arna in Kazakhstan and Lucky Town in Japan.

12	Does Mobile WiMAX use Mesh technology?
Mesh is a network structure, and is in a meshed structure that allows for communication between terminals, in addition to enabling terminals to communicate through base stations. It is mentioned as an optional item in the 802.16 standard, but is not defined in Mobile WiMAX, which uses OFDMA technology.

11	Comparison with competitive technologies, such as 3G LTE and 802.11n
Once the 3GPP LTE standard is completed in 2007, commercialization is expected to happen around 2009. As such, there will be a gap of around 2-3 years. Although the 802.11n standard is scheduled to be completed in 2008, commercialized products are already being released based on a draft version. However, 802.11n is restricted to the WLAN application sector due to issues such as narrow coverage and mobility, despite its high data transmission speed of up to 600Mbps.

10	Mobile WiMAX vs. HSDPA
To improve downlink capacity in 3G systems 3GPP has developed the HSDPA enhancement for WCDMA. This enhancement changes the downlink from CDM to TDM-CDM so as to enable adaptive modulation coding and other spectral efficiency improvements. In other words, HSDPA is designed to partially increase the data capacity of WCDMA, which is originally meant to provide circuit-based voice service well. On the other hand, Mobile WiMAX is basically designed to support IP based high-speed data services and based on OFDM/OFDMA technology which is more suitable for broadband wireless data communication. It has several key advantages over traditional CDMA based 3G systems such as data rates, QoS and scalability.

9	Do the FLYVO products work even on NLOS environment?
Non line-of-sight (NLOS) refers to the wireless environment, and refers to not being able to secure a line-of-sight between the antenna of a base station and the antenna of a terminal. LOS usually occurs for fixed-type terminals or in the suburbs, while NLOS usually occurs for mobile terminals or in the urban environment. Mobile WiMAX (802.16e) can respond to the NLOS environment (cyclic prefix, power control, etc.) and runs on a frequency band of 2-6GHz, allowing it to overcome the linearity of high frequency.

8	What is WiMAX ecosystem?
The WiMAX ecosystem is the entire value chain in the WiMAX industry. Just like a marine ecosystem has numerous plant, fish, coral and even water conditions that affect life for all, the WiMAX ecosystem is comprised of standards bodies, chip vendors, radio manufacturers, systems integrators, software developers, trade groups and even the media to address various aspects of the technology. Much like an environmental ecosystem that inspired its name, the interaction of many firms who deliver different, but important aspects of the solution to the market is the crucial factor for the success of technology in the market. WiMAX industry with over 470 WiMAX Forum members has the essential momentum of growth from several points of view. First of all, vendors are committing themselves to guaranteeing interoperability among others independent of certification. In-depth operability obtained by these efforts will satisfy the complex requirements of service providers who usually adopt mix and match approach in planning their networks. Secondly, ecosystem vendors who are not tied up with access layer like Cisco, Microsoft and Disney are interested in Mobile WiMAX. But the most important factor regarding the growth momentum of WiMAX industry is that all the factors described above is being realized from the bottom without dominant controlling authority. This healthy ecosystem will make the economics of WiMAX attractive by lowering the IPR royalty.

7	Mobile WiMAX Vs. WiBro
WiBro is the name of the service in Korea that uses Mobile WiMAX technology. In other words, WiBro is a Mobile WiMAX technology defined as the Mobile WiMAX certification profile 1.A. Korea independently developed wireless Internet technologies in the past, but has been using the same technology and specifications after ensuring compatibility with IEEE802.16 in 2004.

6	What is TDD?
TTD, or Time Division Duplex, is a way for base stations and terminals to take turns when exchanging data. In the case of FDD (Frequency Division Duplex), base stations and terminals each exchange data using different frequencies. FDD is effective, in that base stations and terminals can always send data, but it takes two times as much as frequency, requires guard band, and consumes a lot of frequency resources. Although it is not so easy to transmit data with TTD, it is an ideal system for countries such as Korea and Japan, where frequency resources have already been exhausted.