Kỹ thuật hợp BURST kết hợp trong mạng OBS

^^^1^<br /> Vi' .<br /> <br /> <br /> <br /> ^" N-;?^-<br /> <br /> <br /> <br /> <br /> G i a i THIEU CHUNG CO chl hop burst dua tren ngudng. Trong giai phdp<br /> De tan dung Meu qua bdng tan trong cae mang IP hpp burst dua tren bp dinh thdi, burst dupe tao ra<br /> dua tren WDM, can thuc Men phuang phdp trayen va giti vdo trong mpng quang tai eac khoang thdi<br /> tai toan quang khdng su dung bd dem quang kM gian theo chu ky, vi vay mang cd the cd cac burst<br /> xu ly luu lupng dot phdt. Mpt trong nhiing phuong dau vdo cd dp ddi bien ddi. Phuong phdp dua tren<br /> phap dupe quan tdm Men nay la IP tren mang gia tri nguong Id gidi han sd gdi bao gdm trong mdi<br /> chuyen mach burst quang OBS md khdng can bd burst, trade kM burst dupe giti vdo trong mpng. Khi<br /> dem trong mpng WDM. Trong mang OBS, mpt burst dd mang cd eae burst dau vdo kieh thudc cd dinh.<br /> dii Ueu gdm riMeu gdi IP dupe chuyen mpch thdng Hd tro QoS Id van dl quan trpng khde trong mang<br /> qua mang toan quang. Mdo dau dieu kMen dupc OBS. Cd nMeu giai phdp dd dupe de xuat de hd trp<br /> phat di trade burst de thuc Men cau Mnh chuyen QoS trong mang 161 OBS, nhu ea ehe ed uu tien dp<br /> mach dpe Myen trayen burst. Ban tin diiu kMen cd lech de cung cap QoS trong mang ldi OBS khdng cd<br /> the cM rd khoang thdi gian burst nhdn biet node bp dem hodc eo ehl uu tien thdi gian thay ddi dp<br /> vd ed the cau Mnh lai ehuyin mach eiia node cho lech.<br /> burst tiep theo. Bdi bdo gidi tMeu phuang phdp hpp burst phan<br /> Mdt van de quan trpng trong OBS Id hpp burst. Hpp biet nhim hd trp QoS vdi ky thuat hpp burst kit hop<br /> hurt Id tien trlnh tdng hop va hpp cae gdi dau vdo CCB mdi dupc de xuat thdng qua so sanh danh gia<br /> thdnh mpt burst. Mpt sd ky thuat hop burst thdng vdi hop burst ldp don SCB.<br /> thudng 14 eo ehe hpp burst dua tten bp dinh thdi vd<br /> <br /> <br /> <br /> TAP CHI CNTT&TT KY 1 (6.2010) 29<br />  CONG NGHE V I E N THONG<br /> <br /> <br /> Burst ini lite<br /> Krvgtr<br /> <br /> <br /> <br /> <br /> BURST c6 d6 ini I4n<br /> k?\Ac nhau<br /> <br /> Hinh 1- Tao burst lop don vol so lop goi dau vao N=4 va so burst uu tien M=4<br /> <br /> <br /> <br /> <br /> Xep hanq cdc gc* ahu vao HQp BURST 06 d6uu<br /> tj^nkh^ nhau<br /> <br /> Hinh Z- Tao burst lop ket hpp vol so lop goi dau vao N=4 va so burst uu tien IVI=4<br /> <br /> <br /> <br /> K H U N G HO'P B U R S T<br /> gill tranh chap dua tren su phdn dopn. Trong sudt<br /> De hd trp QoS trong mpng quang, viec hpp burst qua trlnh tranh chap, dudi cua burst ban dau, md<br /> dupe xdc dinh thdng qua sd ldp cita cac gdi vd sd chit yiu Id cac gdi ldp thap hon se hi loai bd. Trong<br /> burst dupe ho tro uu tien. Mdt burst ed thi gdm cdc eo ehe ndy eac gdi ldp thap hon hi loai bd vl lpi ieh<br /> gdi eua mot ldp rieng (Hinh 1) hodc kit hpp cac eua cdc gdi ldp cao hon.<br /> gdi cua nMeu ldp khde nhau (Hinh 2). Co ehe hpp<br /> Ddt N Id sd ldp gdi diu vdo vd M Id sd burst uu<br /> burst Men nay thudng Id hpp cae burst cd cdc gdi tien. Can cir vdo N ldp gdi vd M burst uu tien, thoi<br /> cua ciing mpt ldp SCB. Mdt eo ehl mdi duoc dl xuat mdn yeu eau QoS bdng cdch xac dinh tap cdc loai<br /> dd Id CO chl hpp ede gdi cua cdc ldp khde nhau vdo burst (CM rd cdc gdi da dupe hop nhu thi ndo).<br /> trong mpt burst vd dupc gpi Id co ehl hpp burst kit Trong md hinh ndy coi ede gdi deu cd kich thudc<br /> hop. cd dinh. Ngodi ra, dp ddi burst cMnh Id sd lupng<br /> Trong thuc tl, sd ldp gdi IP ldn han sd burst uu gdi trong mdt burst. Dat K Id sd loai burst, trong dd<br /> tien. Ky thuat hpp burst kit hpp cd the cung cap cdc M