NTT DOCOMO and Chinese gear maker Huawei Technologies say that a field trial of 5G network technology operating in the 4.5GHz band has achieved speeds of up to 11.29Gbps and a latency of less than 0.5 milliseconds – one-tenth that seen in typical 4G LTE setups. The tests were carried out in Yokohama and made use of new numerology and frame structures according to 3GPP 5G New Radio standards. ‘The macro cell was made up with one base station that works in the 4.5GHz band with 200MHz bandwidth, 64 TRXs [transceivers], and 23 UEs [user equipment] of both static and mobile types,’ the vendor explained. ‘According to the test, 11.29Gbps total user throughput was achieved with 24 layers, with each UE receiving two layers. The peak spectrum efficiency reached was 79.82bps/Hz/cell.’
In a separate trial conducted at the Fuji Speedway racing circuit, DOCOMO and Samsung have carried out a 5G test which achieved data rates of up to 2.5Gbps in a vehicle travelling at 150km/h. Transmissions were conducted using the 28GHz high-frequency band, one of the candidate bands that the Ministry of Internal Affairs and Communications is considering for commercial 5G networks in Japan.
Earlier this month, DOCOMO announced plans to team up with Ericsson of Sweden and Intel to develop a 5G trial environment in central Tokyo beginning next year. Centred on the testing and development of use case applications and radio performance in non-laboratory environment, the three firms will work toward the implementation of DOCOMO’s end-to-end system including 5G radio, baseband, virtualised radio access network (RAN) and core network. The cellco also has in place a memorandum of understanding (MOU) with Huawei, signed in December 2014, under which the two firms continue to test Massive MIMO; mixed numerology using filtered OFDM (f-OFDM); and combined performance of Sparse Code Multiple Access (SCMA), Polar Code, and f-OFDM in Japan. DOCOMO is hoping to have a live 5G network in service in 2020.