C. nip kw trin cdc Ichn vise plan cip
CHLIONG 3 NHUNG ONG DUNG CUA VANET
1 0.8 0.8 10.6 1 0.4 A 0.2 0 5 10 15 20 25 30 35 40 45 50 DO diiciaphikemitimpbisooe
Hinh 3.1 MOt xdc suit cita kit not vo tuyin
Hinh 3.2 (a) cho thiy dO tu6i trung binh eta cac thong tin co sin trong mOt chitc xe nhu mOt chirc Wing curt khoang cach tfr cac ngu6n thong tin. C6 the thiy ring dO tint phat hien xip xi tuyen tinh theo khoing cach. T6c dO truyen tang len clang ke yeti mOt dO thiet bj ngay citing tang. Dieu nay la bei xic suit cart skr hinh thish chit& diti tang vii mftt dO thiet bj nay cling tang, ce nghia lit vin chuyen du lieu thong qua truyen th8ng kheng day ngay cling trO nen chi& uu the, trong khi quan trong giao thong vOn tai thong qua chuyen dung gam.
Tai nai mOt dO thiet bj thip, thin gian trung binh cho viec ph6 Bien thong tin cho cac khu vuc ben ngotli c6 the dot duqc mOt gik tri cao tai 400s. Tuy nhien, met dO thiet bj thip ce anh htrong thOm chi can nghiem tang ham vao khit fling c6a mOt chi& xe biet bit cu dieu gi ve ngu6n g6c &I lieu. Th6ng ke, sau 500s mkt thOi gian m8 phOng, duqc ma tit trong Hinh 3.2 (b), 'Lac suit de c6 thrac thong tin tui mOt khoAng cach ngtly cling tang gitun xu6ng nhanh chang. LS, do chinh curt tinh trung nity lit phiti mit mOt khoing th6i gian de mOt chiec xe bit diu chuyen di tir mOt khu vuc din cu, mOt bai xe..., cho den khi n6 gap mOt chiec xe khac ma ttl d6 n6 co the ce &Km thong tin. T6 nheng kit quit, c6 the thiy ring mOt dO thiet bj cao la cAin thiet di ph6 bkin thong tin du tin 4y. Kit quit, giai clop trier khai trong mOt (mg dung VANET, nai ma mot dO thiet bj c6 sin thip, la mOt vin di kh6.
0'0'0* 41, .40 41.441"ara 11 akarA.A. a a A.A.& 2. .40 41.441"ara 11 akarA.A. a a A.A.& 2. CHUONG 3. NHONG ONG D1,JNG CUA VANET
1000 2000 3000 4000 5000 6000
6 el**
a)Tu6i trung binh ciia thong tin
0
0 1000 2000 3000 4000 5000 6000
ICboing akb(s)
(b)Phlin nhe Oa thong tin ve xc
IBM 3.2 Phd hien de lieu being cdch sri dung citc chuifi va xe di deng.
De 118 trq cu the then khai giai door', no dit duqc de xuait d cai dot mOt se luang nhe cac darn vj ben le thrZ ►g (RSU) tai nit giao thong duimg bO quan trung. Nhthig RSU thaw gia vito mang vi tAt ca kit ntoi vai nhau bai mOt mpg luoi du mg truc, do do chia sb mOt nen tang kiln thirc ph6 Wen chung vi ce the litm cAu khoing cdch lan. Anh huong cia vier sir dung bay RSU ket nei vei nhau trong kich bin m8 ti 6 ten co the duqc the hiOn tong hbah 3 3
025 at —*— 0.5 ist - - -s- — 0.5 ist - - -s- — 0.75x - — a- —
1.02st --a-
1000 2000 3000 4000 5000 8000
CHUONG 3. NHUNG UNG DI NG CUA VANET
500 i 400 i 400 1 300 f 1 200 I 1 100 o o "...***VOVI • 004* 411**.ef.
1)0'4 A44.4tA14 4 illA•arit A !tit& it 4
•Ar ■■•4■-■••-.6.4-&-a••••••"&••••
1000 2000 3000 4000 5000 6000
Khaki &Xis)
(a)Tuei trung binh cia thong tin
1 II 0.8 a II 0.8 a 0.8 • Is wail qt:, 1 i 0.4 1 02 oo Moine aidiss)
(b)Phan nh6 cia th8ng tin ye xe
Hinh 3.3 iinh huom ctia cetc dun vi ben a duang
BM h9c duqc * nhitng thi nghiEm nay la ngay ca mOt s6 hrqng ttsong d6i nhe ciut cc: so ha ling b6 sung ce the de dot duqc chi thin ding ke. Tuy Whim, su chum tri vi mOt phin ding ch6 Sr la chic xe khong c6 diy •thi thong tin, vi viy, ay thuOc vao dtic diem cua (mg dung, ket noi yin con la mOt vin de quan tong via RSU.
3.2.3. Cfnh trunk
Giao flip truc tiep giita xe phai di mOt yeti su cash tranh mph me to truyen thong di dung hiEn tai vi Wong lai. Vi du, hE thong 3G dit cung cAp truy cOp Internet di dung gii ca phai chling vI ph6 Men rung raj. D6 la ho ljr de gii djnh ring chi phi truy Op Internet thip di dung sE sem duqc 06 hien truck khi cong nghE VANET tro thinh mOt thqc ti. Uu diem chinh cia truyin thong di dung la chi co mOt buoc nhAy Wong day. MOt khi cic d0 lieu den cic hE thong co so cia mOt man di dung, khOng phai kha 'ling \fa cOng khOng htm che kit not neu phic thio ten duqc ip dung. Dieu
CHUONG 3. NHUNG ONG D1,JNG COA VANET
nay la d(tc biet quan tong neu th8ng tin lien loc tren mat khoitng citch dirt ly dIi. Hon nee, cic mong di dung da tun toi trong khi ding nghe VANET c6 the kbong c6 sin trong nhieu nam ten. VI vb, mOt s6 luqng lan cic img dung dal hei th'6'ng tin lien lac
giita mOt chi& xe va Internet ho#c gifts hai chiec xe cu the 11 khi Wing sir dung mpg di dung.
Kit khic, citch giao tiep eta VANET phi hqp von trao dui kh6i hrqng de lieu cuc bO nhanh va cao. N6 chi don giim la nhanh hen va hieu qui hon de trao dai de lieu gift hai chi& xe trong phom vi sting v8 tuyen trqc tiep hon lit sir dung thong qua mOt mong di dOng. Ngoiti ra, c6 nheng (mg dung, chang hon nhu mat he thong thong tin giao thong, not de lieu duqc quan tam nhieu hotic them chi tat ca cic xe tang yang lin c#► cira xe truyen. Dieu nay ceng la mOt tInh huang trqc tie') giao tie') gilIa xe c6 the c6 lqi the hon cic mpg di dung, bed vl cic thuac tinh wing bi cic bO cala truyiln Ichteg day c6 the duqc khai thic. Cu6i thong tin lien loc VANET van main phi, lam cho ne hip din dal v6i bat img dung nio, neu c6 the d6i phe vai hon chi kha Wing vi kit n6i.
3.3. I'.TNG DUNG