Cooperating Leaky Bucket for Average Rate Enforcement of VBR Video Traffic in ATM Networks

B e c a u s e of t h e b u r s t i n e s s of v i d e o trajgic, a v e r y large s a m p l i n g i n t e r v a l is needed t o o b t a i n acceptable cell loss probab i l i t y . P r e v i o u s s t u d i e s repor t ed v e r y h i g h cel l loss probab i l i t i e s f o r we l l -behaved s o u r c e s w h e n u s i n g t h e L e a k y B u c k e t m e c h a n a s m (LB) t o po l ice VBR v i d e o sources . In this paper , a m e a n r a t e po l i c ing m e c h a n i s m called C o o p e r a t i n g L e a k y B u c k e t (CLB) is in t roduced . This m e c h a n i s m c a n a t t a i n bett e r cel l loss probab i l i t y b y s h a r i n g t h e l eaky b u c k e t s a m o n g a l l sources . In a d d i t i o n , it g u a r a n t e e s t h a t t h e cel l loss probab i l i t y will n e v e r be h i g h e r t h a n t h a t ob ta ined b y LB. D e p e n d i n g o n t h e n u m b e r of trajgic s o u r c e s ava i lab le , t h e cel l loss probab i l i t y c a n be signz f i can t l y reduced w h e n c o m p a r e d t o LB. At t h e s a m e t i m e , t h e c o m b i n e d t r a f i c e n t e r i n g t h e n e t w o r k i s e n f o rced t o be low t h e t o t a l nego t ia t ed t r a f i c r a t e . M o r e o v e r , t h e a d d i t i o n a l o v e r h e a d d u e t o t h e i m p l e m e n t a t i o n o,f CLB is m i n i m a l .