NSN implements CSFB technology for KDDI

Nokia Siemens Networks (NSN) is implementing Circuit Switched Fallback (CSFB) technology to enable CDMA and LTE technologies to work together in KDDI’s network in Japan. It is expected that the nationwide deployment will be completed by mid 2012.

The deployment will allow KDDI to use its existing CDMA network to continue providing high-quality voice services while enhancing the efficiency of its newly deployed LTE network.

NSN provided the CDMA network to the Japanese operator and is also supplying and deploying KDDI's LTE radio network. KDDI expects to launch LTE services by the end of 2012.

''Nokia Siemens Networks' ability to deliver a high-quality end-to-end CSFB solution on time, coupled with its technology expertise means that our customers will benefit from continued high-quality voice and in future, high-speed data services,'' said Toshihiko Yumoto, VP and GM, network technical development division, technology sector at KDDI.

''The operator will be able to maximize the effectiveness of its LTE network bandwidth delivering high-speed data services, while high-quality voice services are carried on the CDMA network, making this approach a win-win for KDDI and its subscribers alike,'' said Scott Mottonen, head of the CDMA/LTE business line, Nokia Siemens Networks.

NSN's CDMA-LTE CSFB solution is implemented via software on the existing CDMA 1X system, which interfaces with KDDI's LTE network.