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transmission time interval (TTI)

The Transmission Time Interval (TTI) defines the time interval of a Transport Block Set (TBS) in UMTS or in other digitalmobile radio networks. It is concerned with the encapsulation of data from higher layers for transmission over radio links

. The TTI interval refers to the transmission duration on the radio link. For this radio transmission, the MAC layer generates a new Transport Block Set every 10 ms or multiple thereof (20 ms, 40 ms, 80 ms). The Transmission Time Interval corresponds to the duration of a Transport Block Set and can be 10, 20, 40 or 80 ms.

In High Speed Downlink Packet Access (HSDPA), theTTI

interval is reduced to 2 ms, which results in faster data transmission. In Evolution Data Optimized (EVDO), the frame size, which has a similar function to the transmission time interval, is 1.67 ms, and in EVDV it has variable lengths of 1.25 ms, 2.5 ms, 5 ms, and 10 ms.

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Englisch: transmission time interval - TTI
Updated at: 15.12.2014
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