HLR
Home Location Register; the database within a GSM network which stores all the subscriber data. An important element in the roaming process
HSCSD
High Speed Circuit Switched Data; a special mode in GSM networks which provides higher data throughput By cocatenating a number of timeslots, each delivering 14.4kbit/s, much higher data speeds can be achieved
HSPSD
High Speed Packet Switched DataIub
The interface between the Node B and the RNC in a UMTS network
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