Analisis hukum terhadap kasus interferensi pada pita frekuensi radio 2,1 GHz untuk layanan seluler 3rd generation (3G) berbasis Universal Mobile Telecommunication System (UMTS) : studi kasus interferensi akibat pemancaran gelombang radio pada pita frekuensi 1983,125-1990 MHz oleh PT. ST = Legal analysis of interference case on 2,1 GHz band for UMTS based 3G cellular services : case study for interference due to radio waves emission on 1983,125-1990 MHz by PT. ST