| HAAT |
Height Above Average Terrain |
A measure of an antenna's height above average terrain. This value is used by the FCC in determining compliance with height limitations and transmitting powers for high sites. |
| hand-off |
|
The process of transferring a call in progress from the current base station to another without interruption as the user moves out of range of the current base station. |
| hand-over |
|
The passing of a call signal from one base station to the next as the user moves out of range or the network software re-routes the call. |
| hard hand-off |
|
A term used in CDMA systems to describe a hand-off
involving a frequency change. The hard hand-off is a break before make hand-off
just like in other wireless systems and must be used where the current and
hand-off candidate base stations do not use the same RF channel. See also
soft hand-off. |
| Hata model |
|
Common name used for the Okamura-Hata model used to predict signal strength levels in land-mobile systems. |
| HLR |
Home Location Register |
|
| HPSK |
Hybrid Phase Shift Keying |
The spreading technique used in the reverse link of 3G systems to reduce the peak-to-average ratio of the signal by reducing zero crossings and 0 degree phase transitions. Also known as Orthogonal Complex Quadrature Phase Shift Keying (OCQPSK). For more information see Agilent application note "HPSK Spreading for 3G". |
| HSCSD |
High Speed Circuit Switched Data |
A circuit-linked technology for higher transmission speeds — up to 57 kilobits per second — primarily in GSM systems. |
| Hz |
Hertz |
A radio frequency measurement (one hertz = one cycle per second). |
|
