The deal follows Three’s acquisition of O2 Ireland in May this year, and forms part of its €300 million network investment strategy.
“This significant network investment further demonstrates our commitment to roll out a state-of-the-art network for our customers,” said David Hennessy, CTO at Three.
“We are moving towards becoming the number one operator in the country and will do this by providing the best network, value and service for our customers.”
Three and Nokia Networks share a 10-year relationship, and development of the new technology is due to start in September.
Nokia Networks will deploy its single RAN platform, based on its Flexi Multiradio 10 Base Station for 2G and 3G, as well as modernise the core network and implement its cloud-ready OSS system, NetAct.
“We will support Three Ireland as it strengthens its position in the market and use our technical expertise to help it become the operator of choice in the county,” added Russell Garner, head of Three UK and Ireland customer team at Nokia Networks.
The overall network is expected to complete in 2017 and Three customers are hoped to start benefitting from the improvements before then.