L. Enfin, 16.2 permet l'intercompatibilité entre toutes les normes 802

. Il-existe-de-nombreuses-normes-dérivées-de-celle-ci, Les trois plus connues sont la norme 802.11b qui offre un débit de 11Mbit/s dans la bande de fréquence des 2,4 GHz, la norme IEEE 802.11a qui offre un débit de 54 Mbit/s dans la bande de fréquence des 5,3 GHz et enfin la norme IEEE 802

/. Mbit, Ce débit a été multiplié par 10

?. Ieee, 15.2 : définit des recommandations pour l'utilisation de la bande de fréquence des 2, GHz, issue.4

D. Le-mécanisme-est-le-même-que, Cependant les messages à haute priorité (TC élevé) ont plus de chances d'être émis rapidement que ceux à basse priorité. Pour cela, EDCF règle les délais DIFS et CW selon les classes. Plus la classe est prioritaire, plus les délais d'attente sont courts

E. Est-similaire-À and P. , AP contrôle les temps de parole, puis il y a une alternance avec une phase EDCF), mais apporte plusieurs améliorations : ? l'AP peut reprendre la main pendant les phases EDCF, ? la possibilité pour une station d'émettre plusieurs messages(TXoP), ? l'AP peut choisir l'ordre dans lequel il interroge les stations

. Détaillons-un-peu-chaque-amélioration, Le point d'accès peut reprendre la main pendant les phases EDCF : En EPCF, il y a alternance entre les phases EPCF et EDCF. Cependant, lors d'une phase EDCF, l'AP peut reprendre la main quand il le désire. Pour cela l'AP

. Zigbee-est-un-réseau-wpan-de-faible-débitkim, faible consommation énergétique, de courte portée et d'une bonne souplesse d'installation. Il est utilisé principalement pour interconnecter des unités embarquées contraintes énergétiquement (réseau de capteurs, l'estimation de qualité et les mesures de détection d'énergie, sont aussi assurés par la couche physique. La technologie ZigBee est aussi basée sur une technologie sans fil à 2,4 Ghz par étalement de spectre, 2007.

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