Ericsson has teamed up with Japanese mobile operator NTT DoCoMo to run a live 5G mobile broadband trial.
During over-the-air demonstrations in the 15GHz spectrum band, the firms recorded speeds of 5.8Gb.
They originally announced a partnership agreement - with a view to delivering mobile broadband speeds of up to 10Gb - in May 2014.
However, Ericsson and NTT DoCoMo are not the only companies working on the development of a 5G standard.
The likes of Samsung and Huawei are also investing in research and development in this area.
Seizo Onoe, Chief Technology Officer at NTT DoCoMo, said 5G promises "significant performance enhancements" to support future new applications.
These have the potential to impact both users and industry in a positive way, he claimed.
"To proceed with our joint project on 5G field trial further, we are very glad about Ericsson’s success in demonstrating the real potential of 5G radio access technologies at this early stage," Mr Onoe added.