Huawei Successfully Completes Interoperability Test For Ultra-Flash CSFB Solution

Posted on Jan 21 2014 - 9:19am by Editor2

Huawei, a leading global information and communications technology (ICT) solution provider successfully completed an interoperability test (IOT) for an Ultra-Flash Circuit-switched fallback (CSFB) solution with Huawei infrastructure and Qualcomm Technologies, Inc. chipsets at Huawei’s Shanghai R&D facility.


The test results indicated that the solution dramatically shortens voice call setup times for 4G networks, and is now ready for commercial deployment on both mobile networks and smartphones.

Ultra-Flash CSFB makes special use of a single radio voice call continuity (SRVCC) process to significantly shorten voice call setup times for 4G networks. The Ultra-Flash solution reduces CSFB deployment cost and complexity compared to standard solutions, which typically require upgrades to the entire 2G/3G radio network. The Ultra-Flash solution also helps operators smoothly evolve from CSFB to voice over LTE (VoLTE)-enabled networks.

For the IOT, Huawei provided an end-to-end network solution encompassing the radio access network as well as evolved packet core (EPC) and circuit-switched (CS) core networks. Qualcomm Technologies provided test mobile phones embedded with its latest processor, the MSM8974™.

The IOT successfully completed the Ultra-Flash CSFB based on LTE TDD fallback to GSM and LTE FDD fallback to UMTS. Ultra-Flash CSFB shortens call setup times by more than 50%, faster than traditional CS call setup times, so it takes only three seconds for both caller and called phone fallbacks.

Huawei also tested several commercial smartphones running on Qualcomm Technologies’ chipsets. The test results showed that it is not necessary to modify smartphones to be able to make use of the Ultra-Flash CSFB solution and that only chipsets that support SRVCC are needed to do so.

As of December 2013, Huawei has deployed 50 commercial CSFB and won 14 commercial VoLTE networks contracts. To date, Huawei has submitted 12,686 LTE/EPC standards proposals to 3GPP, more than any other company.