Nokia Siemens Networks has successfully completed testing of Orthogonal Sub-Channel (OSC) support for Voice services over Adaptive Multi-user channels on One Slot (VAMOS) handsets with the mobile chipsets provided by MediaTek. OSC, which was invented by NSN, improves the spectral efficiency for GSM.
Nokia Siemens Networks Liquid Radio Software Suite uses OSC to support up to four devices in one radio timeslot, providing up to double voice capacity in GSM. The company said the OSC feature is currently in commercial use in networks serving more than 500 million users.
By enhancing OSC with support for VAMOS handsets, an average capacity increase of 5% can be provided, helping operators further reduce the capacity required for GSM and dedicate more network resources to WCDMA and LTE when they are re-farming spectrum. Successful compatibility testing with VAMOS capable chipsets is a major milestone in this development.
“Collaboration with MediaTek to implement OSC enhancements for VAMOS-capable devices puts us in a position to offer even better GSM spectral efficiency to our customers,” said Kimmo Virkki, head of GSM product management at Nokia Siemens Networks. “We will continue innovating in this area.”
Nokia Siemens Networks’ OSC support is compliant with 3GPP GERAN release 9.
