Nokia Siemens Networks (NSN) has successfully carried out field trials of Orthogonal Sub Channel (OSC) technology that is said to double the voice capacity of GSM radio networks using standard handsets. The OSC test demonstrated the use of four handsets sharing only one radio timeslot without compromising the call quality. NSN says the demonstration with existing commercially available GSM handsets was the first of its kind and is a "significant step in GSM evolution."

The aim is to help mobile operators cope with their cost challenges due to declining revenues per call minute. With OSC technology, operators can gain more capacity from the same base station hardware, meaning fewer base station sites are needed in network rollouts and capacity extensions, which in turn saves energy and decreases the CO2 emissions.

"This successful demonstration is made possible by a software upgrade to existing Flexi EDGE Base Station and Base Station Controller. OSC is fully interoperable with existing handsets, so it promises immediate cost saving for operators", said Prashant Agnihotri, Head of GSM/EDGE product management, Nokia Siemens Networks.