IPWireless Operates Where Other Mobile Broadband Systems Simply Don't

IPWireless can operate in either a single 5 MHz channel, a 10 MHz channel, or in pairs of 5MHz or 10MHz channels, with development underway for 15MHz and 20MHz channels. IPWireless has commercial products currently in production for the following bands:

• 700 MHz (Proven in a recent initiative with T-Mobile in Germany). North American deployments include SGRITA and USA Choice. IPWireless network infrastructure equipment and devices work across the entire 700MHz frequency band including the lower A and B bands.
• 850 - 900 MHz
• 1900 - 1920 MHz (IMT-2000 3G band)
• 2010 - 2025 MHz (IMT-2000 3G band)
• 2053 - 2082 MHz
• 2496 - 2690 MHz (BRS band in US, IMT-2000 extension band internationally)

Frequency Reuse

The 3GPP UMTS TD-CDMA standard is designed to support n=1 reuse (single frequency network). To be able to support true n=1 reuse, a technology must be able to operate with negative C/I (desired signal below the level of interference / noise). UMTS TD-CDMA achieves this by using direct-sequence spread-spectrum, which provides the processing gain required for negative C/I operation. IPWireless can therefore operate with all cells and sectors on the same frequency. The UMTS TD-CDMA system adapts dynamically to changing channel conditions, including C/I which is the dominant factor in the throughput achieved in an interference-limited environment. Therefore, while the system operates perfectly with n=1 reuse, average throughputs will be significantly higher if a multiple-frequency reuse is used. A reuse of n=3 with 3-sector sites (1:3 reuse) is commonly used by operators who have sufficient spectrum. Other reuse schemes are also feasible, such as n=2 with 4 sector sites (1:2 reuse). Simulations and trial results show that there is little advantage in reuse greater than n=3, as n=3 performance is similar to the "no interference" case.