A successful interoperability test (IOT) for an Ultra-Flash Circuit-Switched Fallback (CSFB) solution has been achieved by Huawei and Qualcomm Technologies chipsets at Huawei’s Shanghai R&D facility, LteWorld reported Tuesday.

The IOT completed the Ultra-Flash CSFB based on LTE TDD fallback to GSM and LTE FDD fallback to UMTS. According to the test results, the solution dramatically shortens voice call setup times for 4G networks by more than 50 percent, faster than traditional CS call setup times. It takes only three seconds for both caller and receiver fallbacks.

According to the company, this solution reduces CSFB deployment cost and complexity compared to standard solutions, which typically require upgrades to the entire 2G/3G radio network. The solution is now ready for commercial deployment on both mobile networks and smartphones.