\documentclass{beamer}

\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@techreport{3GPP:36.104,
    author={3GPP},
    institution={3rd Generation Partnership Project (3GPP)},
    title={Evolved Universal Terrestrial Radio Access {(E-UTRA)}; Base Station {(BS)} radio transmission and reception},
    type={TS},
    number={36.104},
    year=2012,
    month=sep,
    url={http://www.3gpp.org/ftp/Specs/html-info/36104.htm},
    urldate={2014-04},
}

@techreport{4GPP:36.104,
    author={4GPP},
    institution={4rd Generation Partnership Project (3GPP)},
    title={Evolved Universal Terrestrial Radio Access {(E-UTRA)}; Base Station {(BS)} radio transmission and reception},
    type={TS},
    number={36.104},
    year=2012,
    month=sep,
    url={http://www.3gpp.org/ftp/Specs/html-info/36104.htm},
    urldate={2014-04},
}
\end{filecontents}

\usepackage[style=authoryear-ibid]{biblatex}
\addbibresource{\jobname.bib}

\makeatletter
\newcommand\myfootcite[1]{%
    \footnote{\fullcite{#1}}
}

\DeclareCiteCommand{\fullcite}
  {}
  {%
      \ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
          {already seen}
          {\usedriver
               {\DeclareNameAlias{sortname}{default}}
               {\thefield{entrytype}}}
     }
  {}
  {}

\makeatother

\begin{document}

\begin{frame}{Frame 1}
    bla\footnote{Test 1}

    bla\myfootcite{3GPP:36.104}

    bla\myfootcite{3GPP:36.104}

    bla\footnote{Test 2}

    bla\myfootcite{3GPP:36.104}
\end{frame}

\begin{frame}{Frame 2}
    bla\footnote{Test 3}

    bla\myfootcite{3GPP:36.104}

    bla\footnote{Test 4}

    bla\myfootcite{3GPP:36.104}

    bla\myfootcite{4GPP:36.104}
\end{frame}

\end{document}