Huawei has carried out the world's first voice call technology CSFB between networks and UMTS TDD LTE

Huawei has announced the implementation of the world's first voice call technology CSFB (Circuit-Switched Fallback) between the network and the network TDD LTE UMTS. The call was made ​​from a smartphone STREAM 201HW company Huawei, which is currently offered by the operator SOFTBANK MOBILE in Japan. To make a call to the UMTS network operator was connected SOFTBANK MOBILE network AXGP (Advanced eXtended Global Platform). AXGP - a network that is compatible with the company's TDD LTE Wireless City Planning, which belongs to SOFTBANK. CSFB provides voice circuit-switched services and short message for devices LTE. When LTE phone initiates or receives a voice call to him, the device enters the network UMTS. This feature is necessary as network LTE - it is a standard all-IP network based on packet switching technology that do not support switching channels. Before the introduction of IP-Multimedia Subsystem (IMS), 2G/3G network is used to provide voice services to subscribers LTE. Operators can provide voice services to subscribers without deploying LTE and IMS for CSFB. But in the future it will help operators keep the initial investment and will provide voice services to end-users, and many radio technology.


At the heart of the mobile device STREAM 201HW Huawei - specialized chip Qualcomm IC (Integrated Circuit), supports both TDD LTE (AXGP), and UMTS.