ETSI (European Telecommunications Standards Institute) is the specification you want. It lays out all the required tests for GSM. Test equipment vendors like Rohde & Schwarz and Aglient can point you in the right direction either by calling a rep or looking up communications test sets on their websites.
You can find the document you need here:http://www.etsi.org/services_products/f ... smumts.pdf
You can download the document here:http://www.etsi.org/services_products/f ... dard_a.htm
- Kirt Blattenberger
RF Cafe Progenitor & Webmaster