MOBiL TELEKOM SEKT0RiJNDE GiJVENLiK (:0ZDMLERi

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1 S/\l J Fen Bltnler Enstllsl Dcres <J.Clt. '.Sa\. 1 '005 1\ lohl Telekon1 SckthCtH.k Cthcnlk \ ')Cn lcr. Karnhnca MOBL TELEKOM SEKT0RJNDE GJVENLK (:0ZDMLER 1 J Adem Karahoca, Talat F1rlar 1 B a h <; e $ t: h r ( J n v er s t c s M l h c n d s k Fa k L t e s R l g say a r M L h e n d s g 8 b L tn U 3 L:; 38 B a h <; e c h r s t a n b u.. stanbul LJn vc rstcs Tcknk Bln1ler M.Y.O. Avc J ar stanbul ABSTRACT M ob le te lccon1n1un caton ndustry s n a radca l developtnent process n todays vvorld. n t h proces, an ncrease the servces \Vhch are based on data for tn oble users are n1 ore antcpated than the voce con1n1un caton syster Effectve sec urty so lu tons n1u st be provded as soo n as poss ble to co ntnue the success of th ndustr;. A sec1 envronn1cnt should be obtaned for th e n1oble network systen1s. applcaton provders and ub"crptons n order a llo\v th en1 to perf<.,rnl operatons. Accord ng to the Noka, th ere are approxtnately 300 thrdgeneraton tn ob le networks and each of the n1 has at le l 000 access nodes \V th one bllon subsc rbers n th e n1 oble telecotnn1un caton ndustry. rh cse \\'de area net\vorks go ng to be P based systen1 s so sec ure envronn1ents n1ust be establshed whch nclud es the functons of verfcat warnno and tracnn. b n ths artcle, sec urty so lutons of second and thrd generaton n1 oble tec hnologes arc general) ex planed fo r n1 oc groups. Also the vvrtcr dea ls \Vth the securty probletns and so lutons n the parallel of the grlat c'\pcrcnces \ V h \VC rc ga ned w hle \VO rk ng n a GSM operator n Turkey. Key Words C:JS M. Securty ONSOZ Mobl telekornlnkasyon endlstrs, radkal don. $ltn surec ndedr. Bu s.rec;te. ses l et n1ncl en c;t. c; n vcryc daya lt se rv lern artttnlnlas J ongorultn ektedr. Endlstrn n baa rt Jntn devan1 1 c;o/.tnlcrne htya<; va rd11. M obl ag lann. uygularna saglay tclann ve aboneler n g.venl br ya pab ln1 elcrn sag lan1ak c; n guvenlr ortarnlar olu $turn1ak gerekn1ektedr. kullantcj K l l ' ve n l d c $1 e e r M obl tclckorn cncl lstrsnd e, 300 tan e Uc;.n cuku $ak rnobl agdan, her brnde en az 000 ert $1 111 dugun1u nd en v e 111lva r aboncden bahseclln1 cktcdr. (kay nak: Noka) bu c;ok gen$ ag lar. P tabanlt olacak ve bu ) lzden dogrulan uyarl /letn c ve takp etn1 c fonksyonlanntn jc;erleceg glvenlk ortan1lannlll ku ruln1 as 1 gerekn1ektcdr. B u n Hl k a 1 c d c, tn o b to p ulu k a r c; n, k n c, 2 Y2. v e.. n c. k u $a k 1 n o b t c k no oj e r n g. v e n l k <; o z U n1 l e r U 7 e r n duruln1aktad1r. Yazarl ar. 'lltrkye'dek br GSM operatorlndek dencynllcrnclcn yol <; tka rak glvenlk ac; tkl art c;ozln1lcrn cle aln1 aktadtrl ar. Ana hta r Kel rncler G S M, Securty "' 44

2 . \C ' en 1:3lmlcr EnsttLsCt Dergs 9.Clt. 2.Sny Mobl Tclekon1 Sckt()rCJnck Crl\L'lllk '() 7CJnkr A. Kar.lh oca 1. GRlS M ob tc lekon1 sektoru, knc kuak tekno loj d en, P tahan lt UUncU kuak teknolojlere ge$ a$a n1 as tndad 1r. C<; UncU kuak aglann en onen1 l oze ll k ler [1 ]: 1 P t n ban lt a g a r say e s n de, he 111 se s h c rn de ver et $ 111 le daha <;o k saytd a vc e$ tte nernet tab an l hzn1etlere, n1obl ortatnda olanak saglayacaklar. <::ok gen olacaklar ve bu sayede bnlcrcc ag, blylk 111 k tar a r d a k n1 ob ab one 1 c re h z 111 c t v c r cc e k t r. B u gu n er de. 2. k u $a k t e k no oj cr n d c n W A P ( W re e ss Applcaton ProtocoMobl uygulatnalar protoko U ) ve S\lS(short n1essagc servccktsa n1esaj scrvs) tc kno oj ler n n hayata gee; r tnes ne ragn1en, ntera kt f n tern et h zn1et er n n b n;o gu tnob a bone er ta raft ndan kullan tl an1a n1aktad tr. Wap ve SMS,tek glvenl k ac;tk lan ha la tan1 o larak ozu letncd g nden do lay t, dze 11 kle l1ankac tltk uygulan1alannda, bu tl r n1ob l c;oz.n1ler kts ttll <. la rak ku llan tlab n1ek ted r. 2 Y2. vc 3. ku$ak 1: e k n o oj e r n u y g u a tn ay a g c <; r 111 c s l c, b n; o k yen scrvs devreye altnacakttr. l)olaytsj lc, daha etkn g U v e nl k 9 o z Cl n1l er n c h t y a<; v a r eh r [21. V1 ob a g operator le r n n g L\ c n g. 1 nob k u 11 an 1 c 1 n 1 n c ha z 1 n d an, operator Cl n a g 1 n a k ad a r o an k 1 s 1111 kapszunaktad tr. UygulanllHJ ak <;<zujnlcrde, letn1 ] l(l\ aja frclendrlr, f1kat. opcrat( run ag111da let$ln $frcl degldr. a b o. 1 ob T e k no oj K u a k a 1 1 T'eklloloj GSM,CDMATDMA GPRS UMTS U J' o ul a 111ft., Zal11ll11l S111s ve hzn1etler hayatta WAP lk <;eyregnde uyguland1 1. Asya/P as fk 2002 <;eyreg11de t1ygulat1d1 2. Avrupa 2004 <;eyreg11de uygulanacak 3. ABD 2006 <;eyrekte t1ygula11acak l 1. l 1 ;. [. 1 l l Ver et $ tn n de g U v en k, sad e c e a g opera t 6 r L v c abo ney degl, ayn zatnanda. uygulatna saglaytc tyt da kapsa n1 aktad 1r. 2. KNC KU SA K AGLAR. lknc ku$ak aglarda. aboneler. nternet er n1lern. a;n zan1anda nternet saglay tct konun1undak n1obl servs saglaytcardan, ya n gsn1 operatorlernden sag a 111 a k t ad 1 rl a r. n tern et' e bag an tl cl l< tan so n r a aboneler, kururnsal vcva, tcar W AP scrvslernden h z 111 c t a ab r er. S M S, 111 o b a fr opera tc) rl n cl en dog r u d an k u 11 an 1l ab r b r ' h z 111 et t r. knc kuak aglardak glvenl k konulart $Ullard1r: Kurutndan, operatbre baglantnak c; n kullantlan hatt1 n gu ven l g, WAP ve SMS c; n, glvcnlr c n 1111 ve kt sttlann11$ ert $tm. W AP, gene llkle lp Uzernd en u yg ul a ntr fakat SMS br P servtst degldr. Stand art, VPN(vrtual prvate N et\vorkssanal oze ag)/f rewal ( Ate$ d uvan) dzln1l er kurun1dan operatdrc gden hatlarda glvenlr ver aktanrn t n uygu lanablr. Hen1 ku run1 sa l hen1 de tcar W AP servs saglay tctl an, a$ag tdak $artlan saglatnaltdtr. 1. Servsn sadece yetklend r ltn$ kullantctlar taraftndan kullantln1astnt safda1nak,. 2. K.ull an 1 c tl art n ve r ye er $ n1l er n k 1 s 1 t a 111 a k Mobl Uygulama Protokol(WAP) Mob l uygulan1a protoko ltl n1ob l chazlarda. n1 obl b g n n s u n uln1 as 1 v e t c s 111 c d ln1 e s n k u 11 a n l an standartttr(3]. WAP gcnc llkl e, lp scrvs olarak uygulantr ve tn ob l chazlar <; n web gezg n arac dt g le b lg ed nn1n n1ltnkln ktlar. W /\P kullancllan, lnternet'e baglt oln1adtrlar vc bu ylzdcn hen1 nternetten hern de abone lerden ge lecek tehdtlere aytk durun1dad1rlar. Sekl 1, kurutnsal blgnn br WAP hatt1 boyunca, guve nlr br b <; n1de, nas tl ta$ 1nacagtnl goster n1 ektedr. (1) VPN/ Frewall'da kullantct blgs, VPN/Frewall Mod UUndcn al tntr ve web sunucusu kull antlablr hale getrlr. (2) VPN / Frewall 'da se, W AP gec; d korunuln1aktad1r. B urada ate$ d uvan uygu lann1azsa, W A P gee; d le kurun1sal gec; t SSL kullandarak $freleneb lr. WAP ge<; d br VPN/Frewall n1od UU lc korunursa: a. Mob l kullantctya abo nenn gr$ blgs. HT fp 'de n ac; tl arak, ya da kullantc1dan e r 111 b g er t e k r a r s tenere k, g U v e n r r saglanab lr. _ '( _ h. 8 a g ant 1 y 1 d z e 11 c $ t nn e k <; n, W A P g c d ve kurutnsa l gct aras tnd a br VPN kurulur. 45

3 . A.LJ Fen B n1l e r Ens tt ls L De r g s 9. C L. Say v1ohl Tlcko n1 Skt< 1 r l nd c C L\ n l k \ '0/ Unllen A. K ar aho ca Gvenlr SMS Ver Ak11 Se k 2 ' de, kuru 111 sa ver n n g U v en r b r b 111 de, b r n1obl c haza let lebltnes gosterltnekted r. Kurun1sal web sunucusu le uygulatna saglaytct aras tnda br sanal ozel ag yapdandtnltnaltdlr.br uygulatna, (SMSC'nn ya n1 nd ak uygu latna sunucuda kurun1 sal ag d t$111dak) P Protoko ltne (HTTP veya SMTP) go n1utnt SMS tnesajt VPN aract ltgt le gtvenlr hale getrlr KUAK YUKSEK HZL VER AGLAR 2 Y2. k u $a k, 3. k u $a k a g art n e v r tn ne b r g e 9 $ olu$tunnaktadjr ku$akta, 2. ku$ak alt yap tst ndan ses let Jn ayn ka ln1aktad1 r ve lp tabanlt ver agt, 2. kuak ag ersnde uygulann1aktad1r. Mobl ag nternet servs saglay1ct konun1una geln1ekted r ve 2 /'2. ku ak GPRS(General Packet Rad o ServceGene} Paketlemel Radyo Servs) servs "her zatnan bagj kal" orta1n1nt GPRS' destekleyen GSM telefonlart c; n saglamaktad tr. GPRS European Te lecotnrnuncaton Standards n s tt ut e (ET S ) tar a ft n d an g e $ t r 1 m $ t r. Stand artl a$t nna c;a l$111alar 1993 'de ba$lalnt$ ve spesfkasyon faz l c; n tanlamlannlt$ttr, fakat, brc;o k kuc;uk deg$klk beklenn1ektedr. GPRS, ver transfern lerye goturrnek ve buyuk n1ktarlardak very lettnek c;n tasarl an1n1$ br teknolojdr. GPRS, br GSM hzmet olarak ele altnrnaktadtr ve kendne has br oz aat b oltnastna ragrnen, radyo ag1 GPRS ve GSM oz aglan arast nda payla$t1rtl1naktadjr. Ek olarak, GSM, GPRS oz ag1ndan fayda lanarak daha y performans le brlkte ver ye bag G M hzn1 etler vennek c;n uygundur. Ancak, herhang br GSM agtnda baglatnakstztn br GPRS agt olu$turmak 1nUn1kUndUr. Bu durutnda GPRS agt kend radyo ag tna sah p oln1altdtr. Sek l 3 'dek ag konfgurasyonunda, tnobl chazdan n tern et e bag ant 1 k u r ultn a k t ad 1 r [ 4]. l Br abone SGSN'e baglan1r., SGSN br GTP(GPRS TUnel Protoko U) ac;ar GGSN 'e baglantr, Mobl chaz n br P adresn GGSN tahss eder, Baglantt, GTP tunel Uzernden kurulur Gvenlk Konular1. Mobl operato run agtnt, nternetten ve dger rnobl operatorlerden korumak, 2. Br abone tabanl 1 poltka saglamak, 3. Fark lt ara yuzlerden(g n,g ) ver baglanttstnl korutnak, 4. GGSN'ler ve kurutnsal gec; tler arastnd a YPN ler o lu$tunnak P Adres Y onet m lp Adres Yonetn1, GPRS aglannda lave br konudt r 1. P ad res er n n s 1 n 1 r t say 1 d a o ltn as 1 n d an d o ay 1. l P adres tahss n1ekanztnastn1n b r havuz kullantlar(; saglantnas t gerekrnektedr 2. Dola1n1 Mob l te lefonl ar br hlcreden dgerne veya br tnob l operatortn agtndan d ger ne gec;erlerken, yen br lp adres ne htya duyarlar (mkro n1 ob lt ve n1 akro n1oblt) 3.2. Gvenlk (:ozmler Mobl Ag1 Korumak M ob ver ag1 P tab an ltd 1r ve nternetten ge e b ec e turn sa ld1n lara ve herhang br kurun1 sal agdan gele c t eh d t ere de a<; 1 k t 1 r. M ob a g, her er $ 111 d U g L n d (GSN er) koru ntn a l1d1r. 1. Abonenn GS M telefonuna baglanttlan, 2. Dger n1obl aglann baglantan, 3. nternet Gelenekse ltnob l ag lar, c;ok buytk olduklanndan., b L operatorl erdc bnlerce SGSN o lu t urrnak zorundad 1n Abone Tabanh Gvenlk Poltkas1 YPN ve Frewal l, ag operatorlernn abone tabar GUvenl k Poltkastnr, er$n1 dlgumle (GGSN' lerde) uygularnaya olanak sag l a rn a Abonenn trsn1, mobl agtn.guvenlk poltkastn( konud ur v >oneler, mesela rnob l vrus sad trtlar korunn1a r " Baglanttsntn Korunmas1 SadcL [ dt. gl faka t ayn zamanda ver let$nl korun l VPN teknolojs, let$tn n ky e oze o 111 a c; n v e g U v en l gn tn ob a g boy u n c z korun1 al Hava bag L.) r, n1ob l ag teknolojs standartlar1 le frel cnr \ e t' t rn, baz stasyonunda $fre a<; tlarak tarnan1lan1r. VPN/Frewall kls lk olarak GSN d e ba$1anarak g venlg saglar. Bu, VPN, GSN ve kurl ge<;t arastndad 1r. Vernn frelenn1 e s nn gerektg bolgcler: 1. Mobl operatortn agtnda (SGSN GGSN) 2. lntcrnet'te (GGSNnternet) 3. Mob l operator aglan arastnda (BGBG) 3.3. Uygulama Senaryolart Bu bollrn a$agtdak uygulama senaryo lanntn orneh s u n 111 a k t ad 1 r: 1. Saydatn nternet Er $nl 2. K u n1 111 sa V P N, 3. D o l a 1111 VPN'er, 4. A bone tab an t zletne, 46

4 S:\C Fen Blmlcr En s t t t Cl Dcrgs 9.C lt, /.Say r 2005 N1obl Tclckon1 Sckthlndc ( (h cnlk \ '();Crn lcr /\. 1\. t rah nc t Sayda m n tern et E r tn Sekl l 'de, abo 11elern nternet cr sn1n n, hcn1 ' () PRS.den he1n de nternet aboncler11n saldlrtlar tn dan korun1nas1n1 ag layan br konfgl rasyonu g(s tennektedr. VPN'Fre\va ll tn odlller, (] PRS aq. tndak her CSN 'e \tk k nr. Bu konfgurasyo nd a. nternet vc dgcr GPR S aglan (GGSN BG) aras1nda VPN'e h tya va rdtr. GSN GGS ha tt tnda (G PRS ag1ndad tr), VPN sc<; rnlkt r ve oze lle$tnnenl1 ya nt stra, servs ka ltesn de sag. latn aktad tr Kuru rnsal VPN $ekl 5'de, kurun1 sal ver (k un11nsal VPN vc Frewall n1oduuyle $frclenr) ntcrnctte $fl clenrn$ olarak letlr. VPRN, SGSNGG SN hatt1nda V PN sc<; n1l ktr Dolann VPN ' ler $ek l6' d<1k ko 11f gu rasyonda, n1 ob l chaz do a$tlllda olsa ble. VP ' lcrn 1nobl cha7a saq_ ana 11 kurlnsal \ ernn glvc nl g n saglad1 g1 gt) rcj ne kted rl5j. $ek l 6 'dak konfgl rasyonda <;o k say1da ckstranet11 y o net 111 n sag ay a c a k b r ( c h t y a<; v a r d 1 r A bone Ta ha nh Engcllcrnc Sck 7 'dek kon fl glrasyonda, abo nen 11 cr$ 111 L her b r aboneye dayand 1 rll a rak kontro ed ln1ekted r. Web <;erg, ag opera tor cr n n vvcb sun ucul an na go nder n1e kt e ve <;e rge er $lll, breysc l aboneere hz1net, abo11e olduk an servslcrc gore saglan1n aktad1r. GPR S aboncs. breysel olarak GPRS P ag 1na uza ktan dog r ul a 111 a l1, k u an 1 c 1 se r vs ( RA 0 U S) a r a c 111 g 1 e baglanarak lp havuzun da11 br lp altr ve aga bag lan1r. GPRS dcstck dg'lln.'lne e r tkte n ve ate$ duvann1 a$ttk ta n sonra uyg ul an1 a web su11uc ul anna e r e blr[6l K ljak MOBL AGLAR 3. ( u $a k M ob l a g a r d a, he 111 se s he 111 d c v cr P tab an 11 o lab lecck t r. K orku n<; sa)ndak 1110 b te lefo n say ts 1 nd an do la) 1, her chaz1n br JP adresne htya<; du yul aca kttr. Bundan do lay t da, 3. ku $ak ag arda he n1 Pv6 he1n de g e le ne k se p V 4 ad r c s e 111 e k ull a 11 tl a c a k t r r 6 '7 ). 3. ku$a ktak bazt glvenlk konulan, 2 1;2. Ku $aktakler le benze rl k gostern1 ekted r: Mob operatorln ag1n 1n nternetten ve de dger n1ob aglard an koruntnast, Abone tabanll br poltkantn uygul anabln1es, Farklt ara y.zer(gn,g,v.s.) Uzernde ver c t $ 111 n k or u n 111 as 1, VPN ern yaratln1ast 2 'h. l(u$ak glven l k konulan na ek o larak, a$agtdak glvenlk konulan 3. ku ak aglardak konujarr daha uygun b r b <; n1de tan an1a ktad tr: U<; Uncl pa rtl crn gl vc nlrlg, o K n t 111 a de g cr se r v c r 11 cl a ha o k o r t ay a <; 1 k 111 as 1 c, 3. part c r d n a l1nacak e rkl c rn vc scrvslcr11 a b o n c c re sag a a s 1 c s 11 as 1 n d a, 3. part c r c a bone a n 1 s 111 cl a tc1 $ 1 y 1 c 1 rollndc k n1 obj operat()rln c; ft tnratl1 guve 11lk n1 ekan zrn as1n 1 cfcvre\e so kn1 as1 gerekn1 ektedr. Fnturalan1 ada kotlye kullan1n1, o Hern tl ketcler, he111 de servs sag lay1c rl ar dlrlst br $ek lde glvenlr br fyatl andtrtna ve odelne sl rec ne ht ya duytnaktad rr Gvcnlk (.:ozjnler M o b a g d a k g v c n k sag an 1 r ken, her er $ 111 d U g 111 L (GSNcr) korunn1al1d1r. Abonenn chaz1na baglant1 ar, [) : c r 111 ob a g a r a b a g a 11 t t1 a r ' ntcrncl 5.1. T ncl Ta ha nh lota 5. TEM EL KA VRAM LAR Mobl opcratorl cr, abonclern e ver servsler sagla n1alar1na rag n1 cn, dogrudan br nternet baglantr s1n1 sagla rn azlar. Bunun k ana neden :. nternet 'Crvs, br nternet serv s saglay tct tar a fnd an ver n1ekted r, 2. Abo11e b r kuru n1sal tn U$terd r ve nternetten <;o k, kuru n1sa b r aga er $n1 es gerektn ekted r_ Abone ver oturun1unu kurarken, GGSN abonenn pro tl ne bag r o a r a k er $ 111 no k ta s 1 n 1 sag a r v e ab one 11 n ver s br tlncl 9er snden, psec, L2TP,GRE, oze hat veya MPLS tabanl1 VPN protokollernden brnn yard11111 le letlr. Br o k dururnda, RADUS kull anllarak adres havuzundan br lp adres, abone <;n tahss edlr lp Adres Tahss Etme Mekanzmas1 GGSN tabanl1 lp adres havuzund a, her br GGSN c; n br P havuzu ta1111nl a11jr. Boylece GGSN her br oturun1 <; n br adrcs ay 1nr ve otururn sonand1rtldg1nda lp adres n hav uza ge r koyar. Havuzdak lp a drc s l e r n t c r n c tt e k u 11 an 111 d a o ab r, Ge<;ersz br adres olab r, orn eg n 1 O.x.y.z Bu n1etodun 9erdg dezavantaj ; Y onetn1 Her GGSN <;n br havuz ou$turn1ada bast br yo gerekr. Aynca, k GGSN n ayn gec;erl adres kullann1atnalan sag an 111 a d 1 r GGSN <;ersnde spesfk br kod yazana kadar, hang kull antctnn hang P 'y kulland1g1 b gs ne er$ lernez, Br GGSN <;n havuzdak plern tukenn1ekte oldugunu rapor edecek br yontetn yoktur, 47

5 S/\0 Fen Bln1lcr En. tt.sc Dcrgs 9.Clt. 2.Sa) 1?()()5 l'vlobl Telckon1 SektOrUnde GC\nlk \ \)/Cnlcr \. Karnhoca Ylksek kullanllablrlk n1odundak br kac; G G S N k ull ant 111 t 8 r G G S N d c v re d 1 kald1g1nda. havuzundak lp adres lernn statusu blnen1 ez. GGSN kurtanld1 g1nda. butln ku llan 1 c tlan n p ler ka d 1 klan yerden devarn eden1ezler Br DHCP stemcs Olarak GGSN 8 u tnekan ztnada. GG S N ( b r D l CP sten1 c s veya D H C P Re ay g b ) b tt U n G G S N er <; n P ad res ha\ u/unu yo neten br DHCP su nucusu le habcrle$r. D H C P sun u c ul a r 1. y u k a r 1 d a b a h sett g 111 z y one t tn, GG SN n devre d 1 1 kaln1ast, P havuzu ydnet n1, DNS Uzernden kullan tc1p yay 11n1 gb konulann c;ozltnler c; n kullantlablr. Adres ler tan1n1l1 veya tanrn1 s1z olablr.. U)'Q; " Suf1U 11 Sckl 2. Gvcnlr S\1S vcrs ak1 1, 6.SONU<; TUrk ye ' d e k b r G S M opera t () r l n d c yap n 11 o d u g u 111 u z tcstlcrde, yukanda bclrttgn1 z gb, c;c$tl noktalarda a<;1klar bulunrnaktad 1r. Ozc llklc, 2. ve 2/2. ku a k a g a r d a k a t ya p 1 n 1 n e ver $1 o l 111 a 111 as 1 n d an do ay 1, tnobl bankactlll< uygulan1alannda, parasal $1etnlern yap 1l1nas1" gc r c;e kl et rl c n1 e tn tr. Ozel lkle, n1ob P<. t c k no o_j s n n 3. k u $a k a g a r a d a ha c n t e g re b r e k d e, pakctlern $frelenerck gbnd crlcblnlcs ve pakctlern n1obl ope ratcrln ag 1nda dcgl, dogrudan n1obl te lefonda th;tlablrncsn dcstcklcyen teknolojlcr c;creb ln1es ndcn do lay eve ut a<; 1 klartn ka pat tl ab lcceg dngdrl n1c kted r. llavada glvenlgn k1srtlr oln1 as1 ve M ob l stasyonlardan bath gen l g nn dl$lk o ln as 1ndan dolayt GPRS hzn1ctlcrne saldtnlar tntnk.ndur. Ozellkle, dger GSM ag lartna baglan1rken kullantlan Gl P'd e n kaynaklanan g.vcn lk a<;1g1, y ukanda da belrttgtnz gb G'rP Uzerne yer l c trlecck br ate$ duvan aracltgt le kontrol edlcblr. Ayrrca, VPN /VLAN tune baglanttlan kullanllarak da haberle$nl e blgsnn $frel letltnesn sag la yarak g. ven l k ac; 1 k larr en aza nd rgeneb n1ekted r. fj)'9ub m;"' \#o/ t> D su J4v s uo u c.u 1 Uguta n l 1 1 t." "' S3 g. f ' um ;. ) ' /;: 1 / j V.., l'.,. t t nn cnr. r f J./ L±J 13G,. 1,f r _,., J SG>r: & : ') " t.: s,., t t Sckl 3. Tpk \1ob l Ag K onfg.rasyonu L 7 ' j., ;.h j c:txn:s EJ L. / ah '"" "" # ; '.1 CJffP ClN... "'t::t "" ' tm"t e kl 1. f\ o h l Ku llantcllar <;n WAP'a er n1 kontroll Sckl 4. GPRS le Saydam ntern et E r m. 48

6 \ \l. 1cn llnkr Enstt'lsCJ Dcrl'. 9.l'L.Stl\ Mobl Tckkon1 Sckl)rlndc (j(h cnlk (,\);'JJnlcr ;\. K(t rah nca ETS ' J.t. / f h r. Y' l lftl E K 1. Mob a g t e k no oj cr n d c k ull a n 1 ltn a k t a o an tern1lern baztl an a$ag1dak gbd r: Ta blo 2. T crmler r, ljb ljg ; JfJ r'./ter' E,., < :1. AH Dognlan1a ha l1 g 1 ANS A 111 e r k a n l J u sa S t a n d a rt la r F.nsttlsU APN Er$ll1 noktas1 J n D ' ; '. AuC Dogrul an1a t nctke( _ BG S1n1r gec; d BLUETOOTH <tsa n1esafel ( 0 rnetre ) l etn1. rkl 5. Kuntmsal VPN standard 1 BSC Baz stasyo nu kon_tro lcls L BSS Baz stasyonu alt sste_1n BTS Baz lctm stasy CGSN Ortak konun1landtrdn11$ GPRS t J r= 1.. " l 'L :. K;, )1 {m r t H 1 f: l j A Jl H "'',_. :. [ ' l rk l 6. (PRS do l a t m VPN'kr ' CbJao"Ln lk Pl $tl.ua q,n.nsj a,p N.J _} Sekl 7. CPRSAbonc tabanlt engclleme ' [ 1..,.m y,,_, t [. J 1.1 ' '. '" l. A. j :": r ' l. 4+ 1c;:a1gntlenm::WNN 9'J. Slll.O.S.J ' CA CKSN CS DNS dcstck dlgcttn. G z k, b Lt L n l L k v e d o 0. r u a 111 a S f re e 111 e an a h tar d z s s n y 1 s 1 Dcvrc anaht arlan1al t. Do tnan Natne Svsten1 EN 0 foend s rr c c n ll $ V e d 0 g r u an 1111 b r SECURTY tu ne l 7 er n d en ha be r e 111 e k. Sadcce 3. kuak lp tabanlr ag larda o ab 111 c k t c d r. ET S \ vrupa l1 1 e lekon1lnkasyon Standartlan Ensttls. FR <;en;evc letn1l FW Ate duvan GGSN G PRS destek dug.tn l ged GMSC GPRS GPRS GS M GSN GSN MSC Global Paketletnel Radvo. Ssten1 (ver serv s saglayan, GSM ve TDMA'ye baglt br n1ob l ag) Genera l Packet Rado Servce M ob l(otn On kasyon n Global Ssten1 G PRS destek du??jn1u GPRS Support Node. GTP GPRS T Un c Protokoll. GU C r a f k k ull a n 1 c 1 a r a b r n 1. Hl.'fP Hper Metn Transfer Protoko U. ME Uluslararast Mobl Chaz l(tnlfl._ MS lj luslararast Mobl Abonc K.n1lg lp nternet Protoko lu lp Sec P guven l g 1Pv4 nternet Protoko l slrltn 4 Pv6 nternet Protokol slr.tn 6 SP nternet servs saglayc LAN Yerel ag LG Y as a y o u nu k e s 111 e g e d MCC Mobl U lke Kodu 49

7 \ ft)hl TL kknn1 Sckt<>rl'lrH.k ( (hcnlk \ "Vlrnkn,\. Karahuca r ME MM MN C MS MSC fvlsn 1 T NE.. MS O& M PO. P O P PN PS. PS'fN QoS RAD US RAJ RAND RPC SG SN SM SM S SN R SRES SS7 TA TCP TE UMTS VC VLR VPN WAP WRELESS VRUS Mobl Cha z M o b 11 g n Y o n c t 111 r Mobl c1g kodu Mobl stasyo n M ob h z 111 c t le r a c; 111 a 111 er k e z Mobl abone ktnlk no Mob d e son an 111 a Ag elen1 an 1 Ul usal Mobl tasyon K n1lk No B a k 1111 v c on art 111 Paket ve r aq t Pake t ve r protoko l. ( se k 111 k n o Pa ket anahtar a n1 a l1 ( j c ne k ull an 1 n1l1 t e c fo n a g 1 Servs ka ltcs U za k tan dog. r ul a 111 a lt, k ull an 1 c 1. servt lcrn n a ran n1as1 Rota a lant ktnl._ Q RANDo n1 say1 Uzaktan prosedur ag trrn a G PRS destck dl gutnunun u n u ln1 as 1 \.bone ktnlk n1odul. K tsa n1 esa j serv s Scr nun1 ara n1 z alann11 yan1t a r e t l e n1 e s sten1 no 7 rrcrn1n al AdaptorU l ct $l11 kontrol protoko U rr ennnal chazt Evrense l Mobl Tclekon1lnkasyon S ste n1l er. anal devre <.onu gun ycrnn kaydt Sanal ozel ag Mobl uygulatna protokolu Mobl chazlar arastnda yayllablen vru sler KAYNAKLAR [ J. G s 111 W orld. /11 h u s G e 11 er u Puck e 1 R u d o Se rr ce http: '/\V\V\v. gsnl\\'orld.conltcchnolog} 'gp rs ntro.s n1l, ( ' d e k o n t r o c d d.). [2]. Chrster, E., Per 0. ( 1998). JYAP The OJ?p/;cu/ on fj/'o ocol, Er csson Rev C\ V. 501 No.4 [ 3]. Peter. A Johan,., and Peter. S. (200 ). 11 'A J> urchlf.c lure F<ulures. serrces und jtn c la Ercsson Re\ C\\ , No.4 [ 4]. Ju ss R_c; e RS Sectll"tl\' Secure?em C'unnecl on.\ ( Jrer c; P RS. htt p: \V\\\\.hut.f j rautpa lgp rs gpr sec. httn l [ 5 ]. P e 1 er. C an d B e rt, V./.( 999 ). Tg r s A g: u e u be\uen crc u.\h'lched unc JP neth orks Ercs Rcv e\v No.2 [6]. Erf S. GS\1 0:260: /) g/ul cel/u telecolnnnll7 culuns srsle111 (Phose ] t ), Gene Packet Rudo S'e1Tce (GP RS), Serrce descrpt Stage. Verson (March 2000 ). [ 7]. E r S. G S M 0360 : f) g a c e u tcleconllnunculons systen1 (Phase :} L ). (;ene P ac ket Rado Se1Tce (GP RS) :Ser\ ce d e.\'ltjjtl Pocket Rado Ser l'ce (G PRS). GPRS c pher, Stage 2, t 'erson /. (July 2000). [8]. ETS. C:JSM O 16 1 :Jgtalcellular tel ec ollllllllllcutons.\ \ 'S fe ll (Phase ] +):Gen} algortl11n n 'lflll' ' 177en/s, t 'erson ( Ma1 7000). 50

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