Another testbed developed for CR is through the CREW project [1]. CREW testbed is based on five existing testbeds available at different physical locations such as heterogeneous ISM test environment, licensed CR testbed (including TV
bands), wireless sensor network testbed, LTE cellular test environment and outdoor heterogeneous ISM/TVWS. The CREW combined a number of functionalities from the aforementioned platforms such as a common portal, the ability to mix and match different aspects of different testbeds, a benchmarking framework, realistic data sets and performance evaluation of external hardware under controlled test conditions.

[1]FP7-CREW Project (http://www.crew-project.eu/overview)