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The iBurst system has an air interface with a TDD/TDMA (Time Division Duplex/Time division Multiple Access) frame structure with multi carrier aggregation support. This frame is divided into 3 uplink followed by 3 downlink slots asymmetrically to support higher data rates over downlink.
All uplink and downlink transmission are scheduled at a constant symbol rate of 500k symbol/sec. The physical and logical characteristics of TDMA/TDD frame have been chosen and optimized for efficient transport of end user IP data and to extract the maximum benefit of Adaptive Antenna Processing, thereby providing high speed data connection to mobile users. |
| Efficient Use of Frequency Resources |
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As the radio resources are scarce, efficient utilization of frequency resources being the top priority, the iBurst system design has integrated the following key radio access technologies.
1)Asymmetric TDD/TDMA frame designed for 625 kHz channelization.
2)Adaptive Array Antenna Processing
3)Spatial Division Multiple Access
4)Adaptive Modulation and Coding
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The iBurst system offers wide service area coverage by maximizing the gain of Effective Isotropically Radiated Power (EIRP) and utilizing Adaptive Array Antenna technology. Although the coverage radius may vary based on the carrier frequency, BS antenna height, type of UT, topology and congestion of building, iBurst can provide more than 850kbps data rate in downlink within a range of 500m from BS in the metropolitan area, and 1km from BS in the rural area. Due to the TDD system design, the maximum cell radius from the BS is 12.75km, considering the signal latency. |
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The iBurst offers users with "Always-on" connectivity to INTERNET and supports the handover function between the BS. User terminal in the iBurst system randomly access BS regularly and automatically judges the communication quality or BS congestion, and maintains the connection with the most appropriate BS, once the UT is authenticated within the iBurst network and unless the users go out of the iBurst network. |
| Simple and Economic Connection to Internet |
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The wired backhaul and core transport networks of the iBurst system is based on the IP traffic. BS and Internet can be connected through Ethernet (100BASE-TX/FX), etc. Operators can chose any open data networking equipment to take advantage of higher data rates, wider coverage and higher capacity offered by iBurst air interface. |
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The iBurst system offers a robust security for air interface encryption and authentication. The authentication for both BS and UT is based on digital certificates that use RSA algorithms. During the authentication phase, BS and UT exchanges shared secret and air interface parameters using public keys based on elliptic curve cryptography. The shared secret is used further for bulk encryption of user data and control messages as per Secure Communications Protocol of the iBurst system). |
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The iBurst system maintains the connectivity of communication even in high terminal mobility environments. This is achieved due to number of different modulation classes and algorithm to appropriately select its modulation and power output control which always maintain the best signal characteristic. Due to those functions, iBurst can achieve the high data rate, even during the high speed movement of user terminals. iBurst always improves the connectivity based on the link adaptation and power control and provides "high data rate" and "always on" connectivity.
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Next coming Event |
| August, 2008 |
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Launching New USB Type User Terminal |
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