RepeaterOne^TM is Qualcomm Inc.'s proprietary technology. RepeaterOne^TM technology squarely tackles the issues which have long been associated with over-the-air repeaters such as reverse link noise and oscillation. RepeaterOne^TM technology can be used in CDMA, EV-DO and UMTS networks.

As a RepeaterOne^TM licensee, ADRF is breaking ground for a whole new line of smart repeaters. The following is a brief summary of what RepeaterOne^TM technology can do to solve problems associated with conventional over-the-air repeaters.

For more detailed information and up-to-date development, please visit Qualcomm's official RepeaterOne^TM website at www.RepeaterOne.com.

First, we start with issues traditionally associated with conventional repeaters.

Excess Gain on Reverse Link Causes Interference

A repeater's noise figure, link gain, and the number of active callers determine how much additional noise is being injected into the noise floor of the network.

The gain of a repeater's reverse link is variable, which presents a potential problem at the time of installation. During installation, if the reverse link gain is set too high, then several dB of extra noise will be added to the base station's coverage area. This has a jamming effect on the base station and needlessly shrinks the coverage area, potentially creating holes of poor wireless coverage.

After installation, the repeater's reverse link gain may change due to reasons such as temperature, component age, etc. Moreover, the reverse link path loss will vary due to many reasons, including sector loading, changes in base station line of sight, antenna obstructions, and changing foliage.

Therefore, a repeater's noise contribution to the base station is not consistent, which leads to uncontrolled donor link of the base station.

BTS & Repeater Coverage Areas

Can a repeater measure path loss and set correct reverse link gain automatically, minimizing uplink noise contribution?
See RepeaterOne^TM Power Controlled Repeater Solution. >>

Forward Link Gain Independent from Reverse Link

Differences in forward and reverse link gains cause errors in open loop power control, resulting in access problems and large swings in closed loop power control. Therefore, link imbalance causes abrupt power changes when transitioning into or out of a repeater coverage area. An active call may drop if it is not able to recover from the transition.

Can a repeater eliminate the link imbalance?
See RepeaterOne^TM Power Controlled Repeater Solution. >>

Forward Link Output Power Monitoring

Setting the correct forward link output power level during installation of a repeater can be a difficult task. The main issue is system loading. Ideally, a repeater should be installed to a specific CDMA pilot power output level to ensure that the desired coverage area is attained. However, the installer typically has no method to measure only pilot power. A typical power meter cannot differentiate between user traffic channels and the CDMA pilot channel.

Can a repeater measure pilot power and set the correct forward link gain?
See RepeaterOne^TM Power Controlled Repeater Solution. >>

Call Traffic Carried by Repeater

Traditionally, there was no way to ever know what the actual traffic carried by a repeater. This made us wonder if there was enough traffic to justify having a repeater. In contrast, in the case of too much traffic, we never knew for certain when it was time to add additional capacity until quality of service deteriorated.

Is there a method to measure exactly how much call traffic is handled by a repeater?
See RepeaterOne^TM RULE solution. >>