Huawei and Qualcomm have completed an LTE voice call to UMTS during a series of optimization tests.
The tests used R9 protocol and Qualcomm’s latest Snapdragon S4 processor, the MSM8960.
The vendors claim that the tests, based on the flash CSFB voice solution for the R9 protocol, resulted in lower call setup latency than that of the R8 protocol, and very close to that of a native UMTS voice call.
During the CSFB testing, which also included LTE TDD calls, good call setup times were seen for both UMTS and GSM, the companies claimed.
LTE networks already meets the need for higher speed mobile broadband data services and the introduction of R9 CSFB is expected to further enhance users’ experiences and enable high quality voice services on their LTE-based smart phones, through CSFB to GSM and UMTS.
The joint CSFB testing was part of an ongoing cooperation between Huawei and Qualcomm on interoperability testing and optimization involving GSM/UMTS/LTE TDD/FDD technologies.