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. Hard Hand Off, used in CDMA systems, describes a hand-off involving a frequency change. Hybrid Automatic Repeat reQuest (HARQ or Hybrid ARQ) is a sheme wherein information blocks are encoded for partial error correction at receiver and additional, uncorrected errors are retransmitted. Hand Over refers to 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. Hand Off (handoff) is 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. Although not particularly powerful, they are one of the "perfect" codes in that its standard array has all of the error patterns that can exist for single errors. Hamming code is a well known simple class of block codes capable of detecting up to two errors and correcting one. The half rate codec uses only half of the time-slots in the frame. Most frame formats are designed to accommodate full and half-rate channels, with the intention of implementing half-rate coding as the technology permits to double system capacity. Half rate is a term used in voice codecs in a communications system.
This value is used by the FCC in determining compliance with height limitations and transmitting powers for high sites.
Height Above Average Terrain (HAAT) is a measure of an antenna's height above average terrain.