Innovative Handoff Avoidance Mechanism and QoS Enhancement for Future WLANs

摘要

W ith t h e d eve l op m e n t o f w i re l e ss co m m un i c a t i o n tech n o l o g ies, IEEE 8 0 2. 1 1 s t a n d a rd? h a s u n d e r g o n e a r a p id g r o w t h , t h an k s to l o w co st a n d h i g h - s p e e d c o n n ec ti v it y . M or e i m p ort a n t l y , t h e F u t u r e w i re l e s s n et w o r k s ar e e x p ec t e d t o h a v e t h e p r i v il e ge o f u b iq u ito u s c o n n ec t i v ity e x t e nd i n g its s u p p o r t to s ev e ra l? a p p li c a tio n s. H e n c e e ff ec ti v e m e c h a n i s m s n e e d t o b e d e ve l o p e d t o e x p l o it t h e d i v e rs i ty acros s a m u lt i p le a cces s p o i n ts a n d to p r ov i d e a un i f o r m l o a d d ist r i b u ti o n in or d e r to i m p r o v e t h e Q o S o f u s e r s a n d t o i m p r o v e t h e ov e ra ll c o m p os ite c a p ac i t y . I n t h is p a p er , w e p r o p o se a c o g n iti v e h an d of f m e c h a n i s m t h at a d a p t i ve ly? a p p li e s?? f u ll?? c h an n e l? s c h e m e? b e f o r e? a n d? Fi r st S a tisf ac ti o n First Re s er v a ti o n H a n d o ff (FSFR-HO) M ech a n i s m a ft e r m i n i m u m d e l a y l i m it a tion t i m e o f s e nsiti v e a pp li c a tion u s e d i n M H b y co nsi d e r i n g t h e c u r re n t a c ti v e a p p li c a t io n i n u se ra t h e r t h a n a s i n g le f i x e d t h re s h o ld va l u e an d d yna m i c a lly c h a n g i n g t h e t h re s h o ld v a l u e d e p e n d i n g up o n t h e c u rr e n tly act i v e a pp li c at i o n s. In a dd iti o n to it, w e a lso p r o po s e d ist r i bu t i v e L o a d B a l a n c i n g s c h e m e w h i c h? c o m p l e t e ly a v o i d s u n n e ce s s ar y o v er l o a d i n g of acc e ss p o i n ts b y c o n si d er i n g t h e l o a d at t h e t a r g et access p o i n t b e f o re a ssoc i ati n g w ith it.