node11.html

来自「用C++编写的GPRS协议栈源代码」· HTML 代码 · 共 42 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>Resource Release</TITLE><META NAME="description" CONTENT="Resource 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="tex2html226" HREF="node12.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://cbl.leeds.ac.uk/nikos/figs/next_motif.gif"></A> <A NAME="tex2html224" HREF="node8.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="http://cbl.leeds.ac.uk/nikos/figs/up_motif.gif"></A> <A NAME="tex2html220" HREF="node10.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="tex2html227" HREF="node12.html">Slot Handling</A><B>Up:</B> <A NAME="tex2html225" HREF="node8.html">Call Set-up and Handling</A><B> Previous:</B> <A NAME="tex2html221" HREF="node10.html">Resource Reply</A><BR> <P><H3><A NAME="SECTION00124300000000000000">Resource Release</A></H3><P>Since Internet traffic is mostly bursty, we have implemented a slotrelease mechanism for GPRS MS.  If the IFQ of the MS is empty and nopacket is transmitted or received for four TDMA frames while the MS isholding a channel, we initiate a <EM>resource_release</EM>.  The MS clearsits <EM>tx_chan[]</EM> and <EM>rx_chan[]</EM> entries and sends a <EM>resource_release</EM>. On receipt of a <EM>resource_release</EM>, the BS purgesits <EM>vlr_.up_table</EM> and <EM>vlr_.down_table</EM> entries. Only an MScan initiate a <EM>resource_release</EM>.<P>If the MS later wants to restart transmission, we send another <EM>resource_request</EM>. This request is treated on par with any other freshrequests by the BS. In the case of traffic from the BS to MS, the BS willallot fresh resources to the MS and send a <EM>resource_reply</EM> informingthe MS.<P><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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