H

Half-rate - A variant on GSM; doubles capacity by more efficient coding using speech compression.

Handoff (inter-cell) - The process by which subscribers traveling throughout the system coverage area are switched from cell-to-cell (and different channels) with better coverage for that particular area when poor quality conversation is detected.

Handoff (intra-cell) - The process by which subscribers traveling throughout the system coverage area are switched from cell sector-to-sector (and different channels) with better coverage for that particular area when poor quality conversation is detected.

Hands-free: - A feature that's included with most of today's car phones. It permits the driver to use his cellular car phone without lifting or holding the handset to his ear. An important safety feature.

HO Tone - Handoff Tone. 50ms of signaling tone sent by the mobile on the REVC to indicate leaving the source cell site during handoff.

Hand Off Measurement Request. (HOMR) - A digital message sent from the MTSO to a possible target cell site requesting the scanning receiver at that cell scan and report the RSSI of a particular mobile.

Handshaking - A set of signals that coordinate the transfer of data from one device to another.

Hard-Handoff - A hand off that occurs when the subscriber is already using the TPC (three-party-conference) card, and the TPC card cannot be used to aid in a smooth handoff.

Harmonic Filter - Used in the base-station and subscriber transmitter circuits to remove unwanted harmonics from being transmitted and radiated by the antenna.

High Side Injection - A superhet receiver design in which the oscillator frequency is above the carrier frequency.

HIPERLAN - An ETSI approved wireless WLAN, operating at 5.2 GHz with data rates up to 20 Mbps per channel (5 channels).

Hybrid - A circuit used in telephony to convert 2-wire to 4-wire operation and vice-versa. Every telephone contains a hybrid to separate ear piece and mouthpiece audio and couple both into a 2-wire circuit that connects to the Central Office. If the hybrid is not balanced properly, echo or 'loop-back' can result in the circuit when the transmitted signal is reflected back into the receive path.

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