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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>Release</TITLE><META NAME="description" CONTENT="Release"><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="tex2html256" HREF="node15.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://cbl.leeds.ac.uk/nikos/figs/next_motif.gif"></A> <A NAME="tex2html254" HREF="node12.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="http://cbl.leeds.ac.uk/nikos/figs/up_motif.gif"></A> <A NAME="tex2html250" HREF="node13.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="tex2html257" HREF="node15.html">Dealing with Collisions</A><B>Up:</B> <A NAME="tex2html255" HREF="node12.html">Slot Handling</A><B> Previous:</B> <A NAME="tex2html251" HREF="node13.html">Allocation</A><BR> <P><H3><A NAME="SECTION00125200000000000000">Release</A></H3><P>Slot release is possible only with GPRS mobile nodes. We maintain arelease timer (<EM>SlotReleaseTimer</EM>) at the MS. On receiving a packet(in either direction) the MS checks the IFQ. If the IFQ is empty, the <EM>SlotReleaseTimer</EM> is started. It is reset if the MS gets another packet(in either direction) within four TDMA frames. Otherwise, on expiry of thetimer, the <EM>releaseHandler()</EM> is called.<P>Currently, the value of four TDMA frames for the release timer is takenbased on simulations performed. It was found optimal in preventingspurious time-outs and avoiding waiting too long. However, the optimalvalue may differ according to traffic generation pattern and needs to befurther explored.<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(shuō)明
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