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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>Handling ARPs</TITLE><META NAME="description" CONTENT="Handling ARPs"><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="tex2html286" HREF="node18.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://cbl.leeds.ac.uk/nikos/figs/next_motif.gif"></A> <A NAME="tex2html284" 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="tex2html278" HREF="node16.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="tex2html287" HREF="node18.html">MacGprs class in C++</A><B>Up:</B> <A NAME="tex2html285" HREF="node3.html">MAC Implementation Details</A><B> Previous:</B> <A NAME="tex2html279" HREF="node16.html">Error model</A><BR> <P><H2><A NAME="SECTION00128000000000000000">Handling ARPs</A></H2><P>At the start of a simulation, the first packet to be received at the Macof an MS is an ARP request. Though this is a broadcast message, it is nottransmitted directly, but resources are requested and the ARP request issent out only on the alloted slot-frequency channel. This is to preventother MS from receiving an ARP request from an MS. The BS however, goesahead and broadcasts the ARP request on the broadcast channel ie slot 0 ondownlink frequency 0.<P>Also, in <I>ns</I>, a node sends an ARP request each time a packet isreceived at the LL, even though an ARP request has already been sent andit is waiting for a reply. To prevent our MAC from transmitting suchduplicate ARP requests and wasting precious radio-resources, we simplydrop duplicate ARPs in <I>ms_recv()</I><P><BR> <HR><P><ADDRESS><I>Richa Jain (96D07007) <BR>Tue Jul 24 22:29:53 IST 2001</I></ADDRESS></BODY></HTML>?? 快捷鍵說明
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