ZTE completed an end-to-end voice-over TD-LTE (VoTD-LTE) call in partnership with China Mobile and Marvell Technology Group.
ZTE said the test represents the industry’s first end-to-end VoTD-LTE call. The test was conducted on China Mobile’s network in Guangzhou, using 5-mode, 13-band smartphones powered by Marvell’s chipsets.
At present, there are three main methods to offer voice services to LTE users: CS Fall Back (CSFB), dual standby and VoLTE. The CSFB solution requires operators to hand off voice calls to slower 2G or 3G networks. The dual standby solution requires terminals to support the 2G/3G and 4G services simultaneously, with the 2G/3G network dedicated to provide voice services. VoLTE is an IMS-based voice service, with voice transmitted as IP data, and can be entirely supported by the LTE network, without 2G or 3G networks. Compared with the CSFB and dual standby solutions, the VoLTE solution offers superior voice quality and lower latency, with improved energy consumption for terminals, delivering a better user experience for 4G services.
ZTE said this testing will help accelerate the adoption of voice services on TD-LTE networks, and usher in the TD-LTE full-service era, aligning the TD-LTE industry with the FDD-LTE industry. As the development of mobile devices, TD-LTE wireless networks and IMS platforms become more mature, more VoLTE services will be deployed.
http://wwwen.zte.com.cn/en/press_center/news/201306/t20130607_399835.html
