DOCOMO, Fujitsu and NEC Achieve CA Using 5G on Multi-Vendor Radio Access

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Fujitsu Limited and NEC Corporation announced today that they have achieved what they believe to be the world’s first carrier aggregation using 5G frequency bands in a multi-vendor radio access network (RAN).

Interoperability with different vendors’ 5G base station equipment
was achieved in compliance with specifications established by the
Open Radio Access Network (O-RAN) Alliance, an international group
working to create more open and intelligent next-generation radio
access networks.

Carrier aggregation was achieved using the 3.7GHz and 4.5GHz bands designated for 5G networks. In addition to this dual connectivity achieved by bundling LTE bands, downlink speeds of 4.2 Gbps will be achievable, enabling ultra-fast data transmission.

DOCOMO already provides commercial 5G services in Japan through a multi-vendor RAN that connects baseband units and remote radio units manufactured by Fujitsu and NEC based on O-RAN’s open fronthaul specifications. The same system configuration was used to achieve this 5G carrier aggregation.

Naoki Tani, Senior Vice President at DOCOMO, said: “The deployment of O-RAN-compliant products will enable DOCOMO to flexibly build networks and provide 5G services that meet customer needs. Carrier aggregation furthering 5G high-speed data communication in a multi- vendor RAN developed jointly with Fujitsu and NEC is an important achievement. DOCOMO will continue to work with industry partners to promote open RAN and 5G services.”

Shingo Mizuno, EVP and Vice Head of System Platform Business at
Fujitsu, commented: “We are delighted to have succeeded in achieving carrier aggregation for 5G high-speed data communication in an environment featuring interconnection of multi-vendor equipment compliant with O-RAN specifications. This key milestone in the evolution of O-RAN will contribute greatly to the delivery of
convenient 5G services and RAN openness, which Fujitsu is actively
supporting with the aim of enhancing 5G services.”

Atsuo Kawamura, Executive Vice President at NEC and President of the company’s Network Services Business Unit, said: “The success of
carrier aggregation in the 5G bands is a critical step in the ongoing
enhancement of 5G network performance. I am very pleased that in
collaboration with DOCOMO and Fujitsu we have now achieved high-
performance O-RAN multi-vendor connectivity. This will lay the
foundation for more open 5G services and business.”

The results of the interoperability verification were presented
between September 25 and 30, during the O-RAN Plugfest web
conferences organized by the O-RAN Alliance. Plugfest was held
concurrently in Japan, China, India, Europe and North America,
facilitating proofs of concept and interoperability tests of O-RAN
products and solutions.

Going forward, DOCOMO, Fujitsu and NEC will continue working toward the early introduction of commercial 5G carrier aggregation services.


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