Loading specification/stage-3/38321-test.tex 0 → 100644 +188 −0 Original line number Diff line number Diff line \documentclass{article} \usepackage{tikz} \usepackage{bytefield} \usepackage{multirow} \usetikzlibrary{chains,arrows.meta} \begin{document} \section*{Foreword} This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). \section{Scope} \section{References} \section{Definitions, sumbols and abbreviations} \subsection{Definitions} For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1]. \begin{description} \item[A2X communication:] A communication to support A2X services leveraging PC5 reference points, as defined in TS 23.256 [31]. A2X services are realized by various types of A2X applications, e.g., BRID or DAA. \item[Air to Ground network:] An NG-RAN consisting of ground-based gNBs, which provide cell towers that send signals up to an aircraft's antenna(s) of onboard ATG terminal, with typical vertical altitude of around 10,000 m and take-off/landing altitudes down to 3000 m. \item[BWP for SRS for positioning Tx frequency hopping:] For SRS for positioning Tx frequency hopping, separate BWP configuration outside BWP configuration for data transmission. \end{description} \section{General} \subsection{Introduction} \subsection{MAC architecture} \subsection{Services} \subsection{Functions} The MAC sublayer supports the following functions: \begin{itemize} \item mapping between logical channels and transport channels; \item multiplexing of MAC SDUs from one or different logical channels onto transport blocks (TB) to be delivered to the physical layer on transport channels; \item demultiplexing of MAC SDUs to one or different logical channels from transport blocks (TB) delivered from the physical layer on transport channels; \item scheduling information reporting; \item error correction through HARQ; \item logical channel prioritization; \item priority handling between overlapping resources of one UE; \item radio resource selection. \end{itemize} The relevance of MAC functions for uplink, downlink, and sidelink is indicated in Table \ref{table:mac-functions-link-direction}. \begin{table}[ht!] \begin{tabular}{|l|c|c|c|c|} \hline MAC function & Downlink & Uplink & Sidelink TX & Sidelink RX \\ \hline Mapping between logical channels and transport channels & X & X & X & X \\ \hline Multiplexing & & X & X & \\ \hline Demultiplexing & X & & & X \\ \hline Scheduling information reporting & & X & X & \\ \hline Error correction through HARQ & X & X & X & X \\ \hline Logical Channel prioritization & & X & X & \\ \hline Radio resource selection & & & X \\ \hline \end{tabular} \caption{The link direction association of MAC functions} \label{table:mac-functions-link-direction} \end{table} \subsection{Channel structure} \section{MAC procedures} \subsubsection{Guard symbols for IAB} \begin{table}[ht!] \begin{tabular}{|c|c|c|} \hline \multicolumn{2}{|c|}{Switching scenario} & Field for number of guard symbols in MAC CE\\ \hline \multirow{4}{10em}{IAB-MT operation to IAB-DU operation} & MT Rx to DU Tx & $NmbGS_1$ \\ \cline{2-3}& MT Rx to DU Rx & $NmbGS_2$\\ \cline{2-3}& MT Tx to DU Tx & $NmbGS_3$ \\ \cline{2-3}& MT Tx to DU Rx & $NmbGS_4$ \\ \hline \multirow{4}{10em}{IAB-DU operation to IAB-MT operation} & DY Rx to MT Tx & $NmbGS_5$ \\ \cline{2-3}& DU Rx to MR Rx & $NmbGS_6$\\ \cline{2-3}& DU Tx to MT Tx & $NmbGS_7$ \\ \cline{2-3}& DU Tx to MT Rx & $NmbGS_8$ \\ \hline \end{tabular} \caption{Switching scenarios and relevant guard symbols for Case-1 timing mode} \label{table:xyz1} \end{table} \section{Protocol Data Units, formats and parameters} \subsection{Protocol Data Units} \subsubsection{General} A MAC PDU is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. In the figures in clause 6, bit strings are represented by tables in which the most significant bit is the leftmost bit of the first line of the table, the least significant bit is the rightmost bit on the last line of the table, and more generally the bit string is to be read from left to right and then in the reading order of the lines. The bit order of each parameter field within a MAC PDU is represented with the first and most significant bit in the leftmost bit and the last and least significant bit in the rightmost bit. A MAC SDU is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. A MAC SDU is included into a MAC PDU from the first bit onward. A MAC CE is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. A MAC subheader is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. Each MAC subheader is placed immediately in front of the corresponding MAC SDU, MAC CE, or padding. The MAC entity shall ignore the value of the Reserved bits in downlink MAC PDUs. \subsubsection{MAC PDU (DL-SCH and UL-SCH except transparent MAC and Random Access Response)} A MAC PDU consists of one or more MAC subPDUs. Each MAC subPDU consists of one of the following: \begin{itemize} \item A MAC subheader only (including padding); \item A MAC subheader and a MAC SDU; \item A MAC subheader and a MAC CE; \item A MAC subheader and padding. \end{itemize} The MAC SDUs are of variable sizes. Each MAC subheader corresponds to either a MAC SDU, a MAC CE, or padding. A MAC subheader except for fixed sized MAC CE, padding, and a MAC SDU containing UL CCCH consists of the header fields R/F/LCID/(eLCID)/L. A MAC subheader for fixed sized MAC CE and padding consists of the header fields R/LCID/(eLCID). A MAC subheader for a MAC SDU containing UL CCCH consists of the header fields (LX)/R/LCID. \begin{figure}[ht!] \centering \begin{bytefield}[bitwidth=1.1em]{8} \bitheader{0-7}\\ \bitbox{1}{ R} & \bitbox{1}{ F} & \bitbox{6}{ LCID} \\ \bitbox{8}{L} & \end{bytefield} \caption{R/F/LCID/(eLCID)/L MAC subheader with 8-bit L field} \end{figure} \subsection{BFR MAC CEs} \begin{figure}[ht!] \centering \begin{bytefield}[bitwidth=2em]{8} \bitheader{0-7}\\ \bitbox{1}{ $C_7$} & \bitbox{1}{ $C_6$} & \bitbox{1}{$C_5$} & \bitbox{1}{ $C_4$} & \bitbox{1}{ $C_3$} & \bitbox{1}{ $C_2$} & \bitbox{1}{ $C_1$} & \bitbox{1}{ SP} \\ \bitbox{1}{ AC} & \bitbox{1}{ R } & \bitbox{6}{Candidate RS ID or R bits} \\ \wordbox[blr]{1}{$\cdots$} \\ \bitbox{1}{ AC} & \bitbox{1}{ R } & \bitbox{6}{Candidate RS ID or R bits} \\ \end{bytefield} \caption{BFR and Truncated BFR MAC CE with one octet Ci field} \end{figure} \end{document} No newline at end of file Loading
specification/stage-3/38321-test.tex 0 → 100644 +188 −0 Original line number Diff line number Diff line \documentclass{article} \usepackage{tikz} \usepackage{bytefield} \usepackage{multirow} \usetikzlibrary{chains,arrows.meta} \begin{document} \section*{Foreword} This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). \section{Scope} \section{References} \section{Definitions, sumbols and abbreviations} \subsection{Definitions} For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1]. \begin{description} \item[A2X communication:] A communication to support A2X services leveraging PC5 reference points, as defined in TS 23.256 [31]. A2X services are realized by various types of A2X applications, e.g., BRID or DAA. \item[Air to Ground network:] An NG-RAN consisting of ground-based gNBs, which provide cell towers that send signals up to an aircraft's antenna(s) of onboard ATG terminal, with typical vertical altitude of around 10,000 m and take-off/landing altitudes down to 3000 m. \item[BWP for SRS for positioning Tx frequency hopping:] For SRS for positioning Tx frequency hopping, separate BWP configuration outside BWP configuration for data transmission. \end{description} \section{General} \subsection{Introduction} \subsection{MAC architecture} \subsection{Services} \subsection{Functions} The MAC sublayer supports the following functions: \begin{itemize} \item mapping between logical channels and transport channels; \item multiplexing of MAC SDUs from one or different logical channels onto transport blocks (TB) to be delivered to the physical layer on transport channels; \item demultiplexing of MAC SDUs to one or different logical channels from transport blocks (TB) delivered from the physical layer on transport channels; \item scheduling information reporting; \item error correction through HARQ; \item logical channel prioritization; \item priority handling between overlapping resources of one UE; \item radio resource selection. \end{itemize} The relevance of MAC functions for uplink, downlink, and sidelink is indicated in Table \ref{table:mac-functions-link-direction}. \begin{table}[ht!] \begin{tabular}{|l|c|c|c|c|} \hline MAC function & Downlink & Uplink & Sidelink TX & Sidelink RX \\ \hline Mapping between logical channels and transport channels & X & X & X & X \\ \hline Multiplexing & & X & X & \\ \hline Demultiplexing & X & & & X \\ \hline Scheduling information reporting & & X & X & \\ \hline Error correction through HARQ & X & X & X & X \\ \hline Logical Channel prioritization & & X & X & \\ \hline Radio resource selection & & & X \\ \hline \end{tabular} \caption{The link direction association of MAC functions} \label{table:mac-functions-link-direction} \end{table} \subsection{Channel structure} \section{MAC procedures} \subsubsection{Guard symbols for IAB} \begin{table}[ht!] \begin{tabular}{|c|c|c|} \hline \multicolumn{2}{|c|}{Switching scenario} & Field for number of guard symbols in MAC CE\\ \hline \multirow{4}{10em}{IAB-MT operation to IAB-DU operation} & MT Rx to DU Tx & $NmbGS_1$ \\ \cline{2-3}& MT Rx to DU Rx & $NmbGS_2$\\ \cline{2-3}& MT Tx to DU Tx & $NmbGS_3$ \\ \cline{2-3}& MT Tx to DU Rx & $NmbGS_4$ \\ \hline \multirow{4}{10em}{IAB-DU operation to IAB-MT operation} & DY Rx to MT Tx & $NmbGS_5$ \\ \cline{2-3}& DU Rx to MR Rx & $NmbGS_6$\\ \cline{2-3}& DU Tx to MT Tx & $NmbGS_7$ \\ \cline{2-3}& DU Tx to MT Rx & $NmbGS_8$ \\ \hline \end{tabular} \caption{Switching scenarios and relevant guard symbols for Case-1 timing mode} \label{table:xyz1} \end{table} \section{Protocol Data Units, formats and parameters} \subsection{Protocol Data Units} \subsubsection{General} A MAC PDU is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. In the figures in clause 6, bit strings are represented by tables in which the most significant bit is the leftmost bit of the first line of the table, the least significant bit is the rightmost bit on the last line of the table, and more generally the bit string is to be read from left to right and then in the reading order of the lines. The bit order of each parameter field within a MAC PDU is represented with the first and most significant bit in the leftmost bit and the last and least significant bit in the rightmost bit. A MAC SDU is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. A MAC SDU is included into a MAC PDU from the first bit onward. A MAC CE is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. A MAC subheader is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. Each MAC subheader is placed immediately in front of the corresponding MAC SDU, MAC CE, or padding. The MAC entity shall ignore the value of the Reserved bits in downlink MAC PDUs. \subsubsection{MAC PDU (DL-SCH and UL-SCH except transparent MAC and Random Access Response)} A MAC PDU consists of one or more MAC subPDUs. Each MAC subPDU consists of one of the following: \begin{itemize} \item A MAC subheader only (including padding); \item A MAC subheader and a MAC SDU; \item A MAC subheader and a MAC CE; \item A MAC subheader and padding. \end{itemize} The MAC SDUs are of variable sizes. Each MAC subheader corresponds to either a MAC SDU, a MAC CE, or padding. A MAC subheader except for fixed sized MAC CE, padding, and a MAC SDU containing UL CCCH consists of the header fields R/F/LCID/(eLCID)/L. A MAC subheader for fixed sized MAC CE and padding consists of the header fields R/LCID/(eLCID). A MAC subheader for a MAC SDU containing UL CCCH consists of the header fields (LX)/R/LCID. \begin{figure}[ht!] \centering \begin{bytefield}[bitwidth=1.1em]{8} \bitheader{0-7}\\ \bitbox{1}{ R} & \bitbox{1}{ F} & \bitbox{6}{ LCID} \\ \bitbox{8}{L} & \end{bytefield} \caption{R/F/LCID/(eLCID)/L MAC subheader with 8-bit L field} \end{figure} \subsection{BFR MAC CEs} \begin{figure}[ht!] \centering \begin{bytefield}[bitwidth=2em]{8} \bitheader{0-7}\\ \bitbox{1}{ $C_7$} & \bitbox{1}{ $C_6$} & \bitbox{1}{$C_5$} & \bitbox{1}{ $C_4$} & \bitbox{1}{ $C_3$} & \bitbox{1}{ $C_2$} & \bitbox{1}{ $C_1$} & \bitbox{1}{ SP} \\ \bitbox{1}{ AC} & \bitbox{1}{ R } & \bitbox{6}{Candidate RS ID or R bits} \\ \wordbox[blr]{1}{$\cdots$} \\ \bitbox{1}{ AC} & \bitbox{1}{ R } & \bitbox{6}{Candidate RS ID or R bits} \\ \end{bytefield} \caption{BFR and Truncated BFR MAC CE with one octet Ci field} \end{figure} \end{document} No newline at end of file
