The HSS (Home Subscriber Server) is the concatenation of the HLR (Home Location Register) and the AuC (Authentication Center) â two functions being already present in pre-IMS 2G/GSM and 3G/UMTS networks.
Three Days Grace's music has been described as post-grunge, hard rock, alternative rock, alternative metal and nu metal. Their self-titled album mostly uses the sounds of alternative metal and post-grunge. However, on their second album One-X, the band had more guitar solos and a more melodic sound.
20 Contributions.   The lead singer of Three Days Grace is Adam Gontier. He started a band called 'Groundswell' with a friend when he was in high school, but the name would later change toâ¦ Three Days Grace. Later another member was added to the band, and they signed a record deal.