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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 Reply</TITLE><META NAME="description" CONTENT="Resource Reply"><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="tex2html218" HREF="node11.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://cbl.leeds.ac.uk/nikos/figs/next_motif.gif"></A> <A NAME="tex2html216" 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="tex2html210" HREF="node9.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="tex2html219" HREF="node11.html">Resource Release</A><B>Up:</B> <A NAME="tex2html217" HREF="node8.html">Call Set-up and Handling</A><B> Previous:</B> <A NAME="tex2html211" HREF="node9.html">Resource Request</A><BR> <P><H3><A NAME="SECTION00124200000000000000">Resource Reply</A></H3><P>The BS allots a channel (slot-frequency) to an MS either on the receipt ofa <EM>resource_request</EM> from the MS or on the receipt of a packet fromits own IFQ for the MS (slot allocation is described in the next section).Information about the slot-frequency channel is written onto the MACheader of the <EM>resource_reply</EM> packet and it is transmitted on slot 0of downlink frequency 0, to the appropriate MS.<P>On receipt of a <EM>resource_reply</EM>, an MS checks the slot-frequencychannel alloted to it and stores it in <EM>tx_chan[]</EM> and <EM>rx_chan[]</EM> for future reference. It then kills the wait timer; schedulesthe old buffered packet to be transmited on the appropriate slot-frequencyand unblocks the IFQ. Other waiting packets can now be passed down fromthe IFQ to the MAC and transmitted.<P>In case the BS has a second <EM>resource_reply</EM> message to betransmitted in slot 0 of the upcoming frame (this situation can arise whenthe BS receives a <EM>resource_request</EM> (from an MS) and a packet destinedto a new MS (from its IFQ) in the same TDMA frame), thesecond reply is stored in a temporary buffer and transmitted on thenext free downlink slot0.<P><BR> <HR><P><ADDRESS><I>Richa Jain (96D07007) <BR>Tue Jul 24 22:29:53 IST 2001</I></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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