ZTE Plots 5G-Like Service on LTE Smartphones
Published on: 3rd Jul 2014
It may be possible to deliver a 5G like user experience on existing LTE based mobile phones, without changing the air interface standards. At least that is the claim being made by China's ZTE.
For example, with Massive MIMO the reference codes, such as the CSI-RS (channel state information reference signal) should be modified to support hundreds of antenna ports, and the terminals should also be modified for the feedback of hundreds of PMIs (Pre-coding Matrix Indicator).
However, in TDD (time division duplex) mode, the symmetry of uplink and downlink channels can be used for channel estimation. Although without feedback channels, the accuracy of channel estimation even exceeds the feedback result. Another example is inter-site interference cancellation in UDNs (user densification network). The interference can be decreased effectively through ZTE's sophisticated 4G Cloud Radio architecture, such as its dynamic local mesh networks, and the R12 on/off technologies.
In addition, ZTE says that it has invested in the development of 4G vector processing chipsets, which have extensible software architecture and can meet pre-5G requirements by modifying software instruction sets rather than changing hardware.
"With next-generation 5G technologies being deployed in 2020, there were industry concerns over what technologies will be used in the next six years," said Dr Xiang Jiying, ZTE's CTO of wireless products. "To address this, ZTE proposes to apply some of the 5G technology on top of 4G to meet users' requirements."
The company didn't say when the first fruits of this research will be in consumers hands though.