NTT DOCOMO introduces VoLTE in Japan

Japanese equipment vendor NEC Corporation has contributed to the launch of NTT DOCOMO’s Voice-over-Long Term Evolution (VoLTE) services by providing core network and wireless base station devices. NEC has provided NTT DOCOMO with video call and Single Radio Voice Call Continuity (SRVCC) functions for existing IMS core network devices, as well as the provision of software updates for EPC core network devices already used in LTE services, making the devices compatible with VoLTE services. The vendor also disclosed that it was selected to develop NTT DOCOMO’s LTE-Advanced (LTE-A) base stations. Further, NEC Corporation CEO Shunichiro Tejima said: 

NEC will continue to work with NTT DOCOMO in developing 5G and other next-generation mobile communications technologies as part of contributing to the overall advancement of communications infrastructure.’

NTT DOCOMO announced in May 2014 that it will introduce VoLTE technology in late June. The operator said that users would likely benefit from download speeds of up to 150Mbps during VoLTE voice calls, while the service would also provide subscribers with ‘Area Mail’ disaster-information notifications while they are making calls. Four smartphones and two tablets in DOCOMO’s summer line-up will be compatible with the VoLTE service after a software update in late June. Further, the operator has revealed that additional data charges for the VoLTE service will be waived until September 2015.


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