node13.html

来自「用C++编写的GPRS协议栈源代码」· HTML 代码 · 共 39 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>Allocation</TITLE><META NAME="description" CONTENT="Allocation"><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="tex2html248" HREF="node14.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://cbl.leeds.ac.uk/nikos/figs/next_motif.gif"></A> <A NAME="tex2html246" 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="tex2html240" HREF="node12.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="tex2html249" HREF="node14.html">Release</A><B>Up:</B> <A NAME="tex2html247" HREF="node12.html">Slot Handling</A><B> Previous:</B> <A NAME="tex2html241" HREF="node12.html">Slot Handling</A><BR> <P><H3><A NAME="SECTION00125100000000000000">Allocation</A></H3><P>At the BS we maintain a table recording which Upslot/Downslot has beenalloted to which MS (in <EM>vlr_</EM>, specifically <EM>vlr_.upslot[][]</EM>and <EM>vlr_downslot[][]</EM>). When the BS receives a <EM>resource_request</EM> from an MS or a packet from its own IFQ (to be sent toan MS), it allocates the <EM>first free slot</EM> available to that MS. Thisis done in <EM>slot_allot()</EM>. If the MS is a GPRS MS, a slot isallocated from the pool of GPRS slots, else from the pool of GSM slots. Bydefault, an MS is GPRS and four slots on each frequency are reserved forGPRS (this leaves only three slots on each frequency for GSM). Allocationis symmetric on the uplink and the downlink frequencies. Only single slotoperation is supported ie each MS can be alloted only one slot.<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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