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Detect and avoid procedures (DAA) are helpful to solve coexistence issues between ultra-wideband (UWB) devices and existing narrowband system operating in the same area and at the same time. We consider a system scenario where a narrowband UMTS terminal is considered to be primary and UWB devices create a secondary network on a local area basis. DAA procedures are only implemented in the UWB devices that coordinate their transmissions in order to reduce and/or to avoid interference to primary device(s) in the same area. UWB cannot alter the operations of the primary device in any way. We present and analyze the performance of an effective DAA procedure to be implemented in the UWB device(s) whose parameters can be tuned in order to reduce the percentage of time the UWB interferes the UMTS device. It is shown that interference reduction is obtained at the expense of a reduced performance of the UWB devices.