Weightless-N Smart City networks deployed in Denmark Weightless-N Smart City networks from Nwave Technologies have been in Copenhagen and Esbjerg, Denmark.Operating in sub-1GHz, licence-exempt ISM spectrum using ultra narrow band (UNB) technology, Weightless-N offers a range of several kilometres, even in c urban environments. Very low power consumption provides for exceptionally long battery life measured in years from small conventional cells. It is the first public network deployments from Nwave since the publication of the Weightless-N open standard.Weightless-N is designed around a differential binary phase shift keying (DBPSK) digital modulation scheme to transmit within narrow frequency bands using a frequency hopping algorithm for interference mitigation and enhanced security. It provides for encryption and implicit authentication using a shared secret key regime to encode transmitted information via a 128 bit AES algorithm.The technology supports mobility with the network automatically routing terminal messages to the correct destination. Multiple networks, typically operated by different companies, are enabled and can be co-located. Each base station queries a central database to determine which network the terminal is registered to in order to decode and route data accordingly.