BBC Radio 1Xtra is a digital radio station in the United Kingdom from the BBC specialising in urban music. Launched at 18:00 on 16 August 2002, it had been codenamed Network X during the consulation period and is the sister station to BBC Radio 1. The station is broadcast from the 8th floor of New Broadcasting House, shared with Radio 1 and the Asian Network. The current station controller is Ben Cooper, who took over from predecessor Andy Parfitt on 28 October 2011.
Source : wikipedia