Arrangement of digital trunking frequency over 380–430 MHz band for border area communication

Indonesia government through the SDPPI department currently arrange 380-430 MHz frequency band with a focus on the frequency spectrum refarming through narrowbanding, the allocation of frequencies for GRN (Government Radio Network), and so on. It was conducted through the allocation of radio frequency channels trunking channels by considering the narrowband channel of 12.5 kHz and 6.25 kHz in 380-430 MHz FDD frequency band. Channel allocation is made by considering the concept of GRN and the potenstial user will be police, fire, ambulance and PPDR (Public Protection and Disaster Relief). The allocation of frequency channels which have planned will be simulated by software SEAMCAT to know the chances of interference between different technologies in adjacent frequency allocations. If the chances of interference between technologies in adjacent frequency bands are less than 5% then allocation can be used. The conclusions are TETRA technology with 25 kHz channel bandwidth can use 416-420 MHz as uplink frequency allocation and 426-430 MHz as downlink frequency allocation, TDMA digital technology with 12.5 kHz channel bandwidth can use the 380-389 MHz as uplink frequency allocation and 390-399 MHz as downlink frequency allocation, and FDMA digital technology with 6.25 kHz channel bandwidth can use the 410-413 MHz and 420-423 MHz as uplink frequency allocation and 413-416 MHz and 423-426 MHz as downlink frequency allocation.