H
Handoff
The transfer of control of a cellular phone call in progress from one cell to another, without any discontinuity
Hands-free
The operation of a cellular phone without using the handset; usually installed in vehicles.
HCS
Hierarchical Cell Structure; the architecture of a multi-layered cellular network where subscribers are handed over from the macro to the micro to the pico layer depending on the current network capacity and the needs of the subscriber
HDLC
High level Data Link Control
HIPERLAN
High Performance Radio Local Access Network; a wireless local area network being standardised by ETSI (Also HIPERLAN2)
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
