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SDL

SDL - Supplemental Downlink for Mobile/Fixed Communications Networks (MFCN)

Defenition by CEPT:

Mobile Supplemental Downlink (Mobile SDL) is a mobile broadband system, which by means of base station transmitters in the network, is able to use unpaired spectrum to provide a supplemental downlink capacity to carry efficiently comprehensive text, audio, images, sound and video content in unicasting, multicasting and/or broadcasting mode to mobile devices. Mobile SDL uses a wider channel for the downlink than for the uplink, by bonding the usual downlink of the paired (FDD) mobile bands with a supplemental downlink channel(s).

Source: http://apps.ero.dk/eccnews/dec-2012/major-step.html