Huawei has announced that it had helped build a 3.5GHz LTE-A trial network in Japan. A recent demonstration of the network showed it could support a max 770 Mb/s download speed by making use of LTE-A technologies like Carrier Aggregation (CA), Coordinated Multi-Point (CoMP) and Cloud BB (Baseband).

The demonstration was held in late August and was hosted by the Global TD-LTE Initiative (GTI) during an ad hoc seminar discussing the latest developments in the LTE TDD 3.5GHz industry. The demonstration was conducted by Japanese mobile operator SoftBank, and was held in Tokyo's densely urban Ginza district. Attendees included representatives from operators China Mobile, SoftBank, UK Broadband, representatives from the WiMAX Forum, as well as chipset companies.

SoftBank also demonstrated a "five-carrier CA" technology for LTE TDD on the 3.5GHz band using a prototype system that can provide a max 1.2 Gb/s download speed when run on Huawei's Ultra-wideband RRU (Remote Radio Unit).

By 2015 in Japan, further spectrum from 3.4 to 3.6GHz is expected be allocated for introducing commercial 4G networks. Worldwide, more 3.5GHz spectrum is expected to be released to promote development of mobile broadband services using high spectrum bands.