The development of mobile uses has revealed a need for transmission at high data rates to the mobile terminal. For example, streaming applications, content loads, software updates on smartphones or tablets. The industry has responded by developing the functionality “supplemental down link” (SDL) or “mobile SDL” which was the subject of experimentation in France, Toulouse, 2013.

SDL technology

International standardization (3GPP) specified in in recent years the mode of operation of the SDL. This innovation, of which Europe is the origin, makes a real while commercial mobile networks are developed in a first time below 1 GHz and above 2 GHz in frequency bands matched (FDD mode). Harmonization actions have been initiated before 2015 and are currently in progress to allow harmonized use for the 91 MHz SDL between 1,427 and 1,518 MHz.

ANFR contributed in 2010 to the work of the CEPT in order to harmonize the band 1 452-1 492 at the European level (CEPT and community from 2013 in 2015). Germany and Italy have confirmed the expectations of the market and granted permits in this band from 2016, after being auctioned. This global identification will allow the generalization of the use of the SDL mode at the world level.

Since 2016, capitalizing on the results of WRC -15, CEPT has continued to work out the conditions for coexistence round of 1518 MHz between mobile SDL (below this frequency) terminals. Mobile- satellite (at In particular those operated by Inmost which has a satellite using the 1518-1525 MHz band for space-to- Earth links for voice / data services with almost global coverage ( cf. ECC Report 263 published in November 2016 ). CEPT also initiated voluntary harmonization work with a view to the adoption of an ECC Decision in November 2017).

In addition, in March 2017, the European Commission, in line with the political objectives of the multiannual spectrum policy plans.  Entrusted the CEPT with a mandate under the Radio Spectrum Decision to communicate the technical conditions for the use of the SDL mobile in the bands 1 427-1 492 MHz and 1 492-1 518 MHz. The tight timeframe for the mandate provides for a final report in November 2017, following a public consultation period during the summer. The Commission would aim at mandatory Community harmonization (EC Decision) for 2018 or 2019.

The work of the CEPT brings together those of the future Voluntary Harmonization Decision (ECC Decision). ANFR it invests to already already to defend the French position by focusing on the conditions for coexistence to 1427 MHz, on the one hand 1518 MHz, on the other. Studies are also under way within the Electromagnetic Compatibility Commission ( EMC ) to define the national conditions applicable for the protection of radio astronomy stations below 1 427 MHz.

On the horizon 2018, the Community framework will require Member States implement harmonized technical conditions. In the whole band according to schedule to be negotiated during the adoption of the EC decision. It could open up some flexibility at the bottom (1 427-1 452 MHz) or the top of the band (1 492-1 518 MHz), in order to facilitate national redevelopments.