One of the most challenging tasks MNOs face is installing a backhaul connection to the core network, when there isn’t the option to run fibre or copper cable to 5G towers.
And in a recent trial at Deutsche Telekom’s Mobile Backhaul Service Center in Athens, Deutsche Telekom, Cosmote and Ericsson have successfully used frequency bands beyond 100GHz, also known as as W-band, for multi-gigabit wireless backhaul capacities for 5G and 6G.
Microwave frequency bands such as these, although having extremely poor general coverage, are superior to mmWave when focusing a narrower beam, which can create a point-to-point connection between sites, and can deliver speeds of up to 10Gbps over distances up to six miles.
“The evolution towards future-proof, cost-efficient and high-capacity wireless backhaul networks will play an important role to accommodate growing traffic demand, increased site location (including small and pico cells) and extend 5G services in the future,” said Dr. Konstantinos Chalkiotis, vice president of 5G solutions, access and home networks at Deutsche Telekom. “The results of our innovation trial with Ericsson confirm the feasibility of using higher frequency bands with wider channels as another solution in our portfolio to deliver high capacity and high performance backhaul for our customers in the 5G era. We hope soon to see those solutions brought into real production in a cost-efficient manner.”
Joint W-band trial
The joint field trial used W-band microwave backhaul over a 1.5km range, with telecom grade availability, using pre-commercial equipment. And the trial recorded speeds of 5.7Gbps over the 1.5km distance, hitting 10Gbps for 1km hops, proving that W-band (92GHz -114GHz) is equal to E-band (70/80GHz), which is currently the only frequency band delivering 10Gbps wireless backhaul for 5G.
“Ericsson has a proud history of innovation with Deutsche Telekom,” said Jonas Hansryd, research manager, microwave systems at Ericsson. “Two years ago, we showed for the first time the possibility to transport more than 100Gbps over a kilometer distance using millimeter wave bands. In our latest joint project, we continue on that path showing the ability to evolve today’s wireless transport by supporting additional, high-capacity backhaul spectrum for 5G and future 6G.”