POSDATA Mobile WiMAX, FLYVO


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.

5	What is OFDMA?
OFDMA stands for Orthogonal Frequency Division Multiple Access. It is a type of multi-carrier modulation, and its application is presently expanding into other areas with the help of advanced VLSI and DSP technology. Each system provides multiplexing by utilizing different resources in order to load more information in the same band. For example, the TDMA system uses time, the FDMA utilizes frequency, and the CDMA system depends on codes. In comparison, OFDMA offers a more efficient way of transmitting high-speed data, as it makes use of both time and frequency for multiplexing

4	What is FLYVO?
FLYVO is a combination of the words ‘fly’ and ‘voyage.' FLYVO, as a POSDATA’s mobile Internet brand, symbolizes free wireless communication and dream communication.

3	What is IEEE 802.16?
It refers to the IEEE (Institute of Electrical and Electronics Engineers)’s LAN/MAN standard committee, whose primary goal is to develop a broadband wireless connection standard. IEEE 802.16 has mainly focused on standardization work for the past two years and has already produced a standard for providing fixed wire MAN services using 10~66 GHz band in April 2002. It has also made it possible to have a 20, 25, or 28 MHz bandwidth transmission rate in the 10.5, 25, 26, 31, 38, and 39 GHz bands. The maximum data transmission rate is 96 Mbps in the 20 MHz band, 120 Mbps in the 25 MHz, and 134.4 Mbps in the 28 MHz.