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H.324M
The H.324 recommendation was formulated by ITU in 1995. It is an umbrella
recommendation that defines multimedia communication algorithms and
protocols for Public Switched Telephony Networks. The recommendation has
been extended (H.324M) for use in mobile circuit-switched networks as well.
HIPERLAN
High Performance Radio Local Area Network. HIPERLAN Type 1 is a wireless
LAN that is ISO 8802 compatible. It is intended to allow high performance
wireless networks to be created, without existing wired infrastructure. In
addition it can be used as an extension for a cable LAN. HIPERLAN is now in
the process of being standardised by ETSI.
HIPERLAN/2
This short range variant is intended as a complementary access mechanism for
UMTS systems as well as for private use as a wireless LAN type system. It will
offer high speed access (25 Mbit/s typical data rate) to a variety of networks
including the UMTS core network, ATM network and IP base network.
Spectrums are allocated for HIPERLAN in the 5GHz range, and a project is
underway in collaboration with CEPT (European Conference of Postal and
Telecommunications Administrations) for extending this allocation either in
licensed or unlicensed format.
HLR
Home Location Register. A data base system which manages subscriber data.
It enables the smooth processing of ID/charged fee data, etc. during roaming
in the case of a variety of differing communication devices and networks.
HSCDS
Hi Speed Circuit Switched Data. An upgrade to GSM networks that enables
data rates up to 57.6kbps. HSCSD was introduced in 1999 to upgrade the
GSM data rate from the previous maximum of 14.4kbps.
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