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defining Unicode char U+042D (decimal 1069) - defining Unicode char U+042E (decimal 1070) - defining Unicode char U+042F (decimal 1071) - defining Unicode char U+0430 (decimal 1072) - defining Unicode char U+0431 (decimal 1073) - defining Unicode char U+0432 (decimal 1074) - defining Unicode char U+0433 (decimal 1075) - defining Unicode char U+0434 (decimal 1076) - defining Unicode char U+0435 (decimal 1077) - defining Unicode char U+0436 (decimal 1078) - defining Unicode char U+0437 (decimal 1079) - defining Unicode char U+0438 (decimal 1080) - defining Unicode char U+0439 (decimal 1081) - defining Unicode char U+043A (decimal 1082) - defining Unicode char U+043B (decimal 1083) - defining Unicode char U+043C (decimal 1084) - defining Unicode char U+043D (decimal 1085) - defining Unicode char U+043E (decimal 1086) - defining Unicode char U+043F (decimal 1087) - defining Unicode char U+0440 (decimal 1088) - defining Unicode char U+0441 (decimal 1089) - defining Unicode char U+0442 (decimal 1090) - 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defining Unicode char U+045F (decimal 1119) - defining Unicode char U+0462 (decimal 1122) - defining Unicode char U+0463 (decimal 1123) - defining Unicode char U+0472 (decimal 1138) - defining Unicode char U+0473 (decimal 1139) - defining Unicode char U+0474 (decimal 1140) - defining Unicode char U+0475 (decimal 1141) - defining Unicode char U+04C0 (decimal 1216) - defining Unicode char U+2013 (decimal 8211) - defining Unicode char U+2014 (decimal 8212) - defining Unicode char U+2018 (decimal 8216) - defining Unicode char U+2019 (decimal 8217) - defining Unicode char U+201C (decimal 8220) - defining Unicode char U+201D (decimal 8221) - defining Unicode char U+2116 (decimal 8470) -) +Now handling font encoding LGR ... +... no UTF-8 mapping file for font encoding LGR defining Unicode char U+00A9 (decimal 169) defining Unicode char U+00AA (decimal 170) @@ -360,5 +262,5 @@ defining Unicode char U+00BA (decimal 186) defining Unicode char U+02C6 (decimal 710) - defining Unicode char U+02CA (decimal 714) + defining Unicode char U+02DC (decimal 732) defining Unicode char U+200C (decimal 8204) defining Unicode char U+2026 (decimal 8230) @@ -366,10 +268,10 @@ defining Unicode char U+2423 (decimal 9251) )) -(/usr/share/texmf-tetex/tex/latex/hyperref/hyperref.sty -Package: hyperref 2003/11/30 v6.74m Hypertext links for LaTeX - 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PDF statistics: - 192 PDF objects out of 300000 - 45 named destinations out of 131072 - 257 words of extra memory for PDF output out of 65536 - - -Output written on AssociazioneMultipla.pdf (7 pages, 197012 bytes). + 736 PDF objects out of 1000 (max. 8388607) + 47 named destinations out of 1000 (max. 131072) + 257 words of extra memory for PDF output out of 10000 (max. 10000000) + Index: /doc/AssociazioneMultipla.tex =================================================================== --- /doc/AssociazioneMultipla.tex (revision 5) +++ /doc/AssociazioneMultipla.tex (revision 6) @@ -389,4 +389,5 @@ \paragraph{Gabola} +\label{gabola} Uno degli aspetti più convincenti di questa soluzione è la possibilità di utilizzare la modalità di risparmio energetica (introdotta nella @@ -398,6 +399,13 @@ risveglio per ricevere l'intera mole di informazioni in attesa di consegna. -% : * il driver sara' in grado di gestire in un unico punto d'entrata le -% : interfacce multiple offerte dal SO +\paragraph{Architettura} +Il \textit{design} della soluzione intende rispondere alle esigenze di +trasparenza per il sistema operativo e, di conseguenza, per l'utente. +Le interfacce virtuali, della cui presenza il \textit{driver} è tenuto a +notificare il SO, aderiscono alle \textit{Wireless Extensions} e si +differenziano attraverso diversi indirizzi MAC (verosimilmente fittizi). +Questa forma di \textit{spoofing} è necessaria sia per lo smistamento dei flussi +in entrata alla stazione e provenienti dai BSS, sia per il convogliamento di +quelli in uscita dalla stazione e diretti ai vari BSS. % TODO % Grafico della faccenda @@ -406,37 +414,54 @@ % DRI \|/ % FW [ ] -Si consiglia inoltre che il \textit{client} si presenti ai differenti BSS con -indirizzi MAC diversi fra loro, in modo tale da evitare partecipazione -ridondante al medesimo ESS. - -% . * componente scheduler (-> interfacce virtuali wext compliant) che -% . pianifica le trasmissioni - - +% ANTENNA Y +% .' `. +% BSS1 .' B1 +% BSS2 B2 +Così facendo si renderà peraltro possibile l'utilizzo di associazioni multiple +all'interno del medesimo ESS per ridondare la partecipazione. +La residenza del componente di gestione dei flussi multipli di comunicazione +all'interno del \textit{driver} lascia chiaramente spazio all'aggiunta di +politiche per pianificazioni ottimali delle trasmissioni (se ne parlerà più +approfonditamente in \ref{sec:ottimizzazioni}. \subsubsection{Vantaggi} -% : * nessuna perdita di dati -% . * power-saving e bufferizzazione dei dati da parte degli AP -% * buone prestazioni -% . * reale associazione multipla -> nessun overhead per -% . riautenticazione/riassociazione -% . * totale trasparenza grazie alle interfacce wext compliant -% . * si puo' non partire da zero (-> madwifi) +\begin{description} + \item [Perdita di dati nulla] + \begin{math} \Leftarrow \end{math} + i dati in arrivo vengono conservati dai BSS grazie allo sfruttamento della + modalità di risparmio energetico (cfr. \ref{gabola}). + \item [Prestazioni massime] \begin{math} \Leftarrow \end{math} + l'effettiva associazione multipla minimizza il costo dei salti evitando + riautenticazioni e riassociazioni. + \item [Trasparenza totale] \begin{math} \Leftarrow \end{math} + le interfacce aderenti alle \texttt{wext} nascondono completamente la realtà + dei fatti (cfr. \ref{sec:wext}). + \item [Punto di partenza già disponibile] \begin{math} \Leftarrow \end{math} + \texttt{MADWiFi} implementa un sottoinsieme delle funzionalità in oggetto + (cfr. \ref{sec:madwifi}). +\end{description} \subsubsection{Svantaggi} -% * grosso sforzo per l'implementazione -% . * parziale reimplementazione di MAC per occuparsi di beghe causate -% dalla molteplicita' dei BSS: -% . * tempistiche: sincronizzazione, rilevamento beacon persi ed eventuale -% . sfruttamento dei CFP. (beacon interval noti e mantenimento di -% . informazioni necessarie per ogni BSS) -% . * sottotipi di autenticazione/crittografia: mantenimento chiavi -% . (|di sessione), stato della crittografia e dell'autenticazione. -% . (getter e setter sugli attributi MIB relativi) -% . * complessita' intrinseca dovuta al livello implementativo -% . * firmware spesso solo binari, quindi probabile reverse engineering -% . * prestazioni non eccellenti, perche` limitate da power-saving e relativi -% . obblighi temporali (TIM...) {non posso proprio fare i miei comodi al -% . 100% } +\begin{description} + \item [Sforzo implementativo considerevole] : \\ + \begin{math} \Leftarrow \end{math} + aggiunta delle nuove funzionalità, mantentendo le informazioni relative agli + stati di autenticazione associazione ed eventualmente sincronizzando la + presenza su un BSS ad infrastruttura con i periodi liberi da contesa; \\ + \begin{math} \Leftarrow \end{math} + parziale reimplementazione di MAC, evitando la perdita dei \texttt{beacon}, + indispensabili per il rispetto dei vincoli temporali + (\ref{sec:vincolitemporali}); \\ + \begin{math} \Leftarrow \end{math} + complessità intrinseca dovuta al basso livello a cui si è costretti ad agire; + \\ + \begin{math} \Leftarrow \end{math} + forma binaria nella quale i \textit{firmware} sono sovente distribuiti che + può costringere a noiose operazioni di ingegneria inversa. +\item [Limitazioni prestazionali] \begin{math} \Leftarrow \end{math} + i vincoli temporali dovuti ad esigenze ordinarie (mantenimento + dell'associazione) e aggiuntive (ritiro dei dati conservati dai BSS) + costringono a salti indesiderati; + \item [] \begin{math} \Leftarrow \end{math} % * troppo specifico % * dipendenza dalla piattaforma fw -> portabilita' minima @@ -444,4 +469,7 @@ % . * la soluzione dipende fortemente dal firmware di riferimento, scarsa % . programmabilita' di parecchie implementazioni + \item [] \begin{math} \Leftarrow \end{math} + +\end{description} \subsection{Sopra il \textit{driver}}