node5.html

来自「用C++编写的GPRS协议栈源代码」· HTML 代码 · 共 48 行

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><!--Converted with LaTeX2HTML 96.1 (Feb 5, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><HTML><HEAD><TITLE>TDMA Slot Structure</TITLE><META NAME="description" CONTENT="TDMA Slot Structure"><META NAME="keywords" CONTENT="gprs"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><LINK REL=STYLESHEET HREF="gprs.css"></HEAD><BODY LANG="EN"> <A NAME="tex2html166" HREF="node6.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://cbl.leeds.ac.uk/nikos/figs/next_motif.gif"></A> <A NAME="tex2html164" HREF="node3.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="http://cbl.leeds.ac.uk/nikos/figs/up_motif.gif"></A> <A NAME="tex2html158" HREF="node4.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="http://cbl.leeds.ac.uk/nikos/figs/previous_motif.gif"></A>   <BR><B> Next:</B> <A NAME="tex2html167" HREF="node6.html">Timing Advance</A><B>Up:</B> <A NAME="tex2html165" HREF="node3.html">MAC Implementation Details</A><B> Previous:</B> <A NAME="tex2html159" HREF="node4.html">Channels</A><BR> <P><H2><A NAME="SECTION00122000000000000000">TDMA Slot Structure</A></H2><P>Every TDMA frame has 8 slots (defined as SLOTS_PER_FRAME). Slot durationis set as 577 microseconds. We transmit 50 bytes ie one (simulated) RLCPDU, in each slot. This models the transmission of one GPRS Radio Block(RB) (of size &nbsp;200 bytes) over four slots in consecutive frames. Forpackets smaller than the size of an RLC PDU (ex <EM>rlc_acks</EM> or <EM>ll_acks</EM>), the packet transmission time is taken as <EM>packet_size/transmission_rate</EM>.<P>We use <EM>Up_Slot_Gprs_Timer</EM> and <EM>Down_Slot_Gprs_Timer</EM> tosignal the start and end of each slot on the uplink and downlinkrespectively, and the processing is handled by the <EM>upslotHandler()</EM>and <EM>downslotHandler()</EM> respectively.<P>The <EM>upslotHandler()</EM> checks whether any MS has a packet to transmitin the current upslot. If it does, the packet is passed onto <EM>tx_onto_PHY()</EM> that starts the `transmission' of the packet. Similarlythe <EM>downslotHandler()</EM> checks at the BS.<P><BR> <HR><UL> <LI> <A NAME="tex2html168" HREF="node6.html#SECTION00122100000000000000">Timing Advance</A></UL><BR> <HR><P><ADDRESS><I>Richa Jain (96D07007) <BR>Tue Jul 24 22:29:53 IST 2001</I></ADDRESS></BODY></HTML>

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