Tong Quan Ve Cong Nghe Wimax, Tinh Hinh Trien Khai Tren the Gioi Va Cac Mo Hinh Ung Dung

8/2/2019 Tong Quan Ve Cong Nghe Wimax, Tinh Hinh Trien Khai Tren the Gioi Va Cac Mo Hinh Ung Dung

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MC LC

1. TNG QUAN CNG NGH WIMAX .................................................. 31.1 S ra i ca cng ngh Wimax ....................................................................................31.2 Chun IEEE 802.16 ........................................................................................................31.3 ng dng cng ngh WiMAX .......................................................................................6

1.3.1 Mng ng trc: ......................................................................................61.3.2 Kt ni mng khng dy doanh nghip: ....................................................61.3.3 Bng rng theo nhu cu: ............................................................................71.3.4 M rng nhanh vng ph sng ..................................................................71.3.5 Roaming dich v ....................................................................................... 7

1.4 Gii thiu chung v cng ngh Wimax .........................................................................81.5 Tnh hnh chun ha cng ngh Wimax ......................................................................14

2. SO SNH WIMAX VI WIFI V 3G .................................................15

2.1 Cng ngh WiFi: ........................................................................................................152.2 Hn ch ca Wifi ..........................................................................................................162.3 Cng ngh 3G ...............................................................................................................16

3. GII PHP CA CC NH SN XUT ..........................................193.1 Gii php ca Intel : .....................................................................................................193.2 Gii php sn phm ca SR-Telecom: ........................................................................253.3 Gii php sn phm ca Alvarion................................................................................303.4 Gii php sn phm ca Motorola cho ISP: ................................................................323.5 Gii php Chipset ca Fujitsu......................................................................................33

4. TNH HNH TRIN KHAI WIMAX TRN TH GII ....................355. HIN TRNG MNG TRUY NHP BNG RNG CA VN .........406. M HNH TRIN KHAI CNG NGH MNG WIMAX ...............44

6.1 Mng dng ring ..........................................................................................................446.2 Cc mng phc v cng ng: .....................................................................................50

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Cc ch vit tt:(1)Wi-Fi (Wireless Fidelity): Tn thng mi cho cc b tiu chun v tnh tngthch ca sn phm s dng cho mng ni b khng dy. N cho php cc thit b ding nh my tnh xch tay v PDA kt ni vi mng ni b, nhng hin thngc s dng truy cp Internet, gi in thoi VoIP khng dy.

(2)

OFDM (Orthogonal Frenquency-Multiplexing): Mt k thut truyn ti da trn tng multiplexing theo tn s (frequency-division multiplexing - FDM). Trong kthut FDM, nhiu tn hiu c gi i cng mt lc nhng trn nhng tn s khcnhau. Cn trong k thut OFDM, ch c mt thit b truyn tn hiu trn nhiu tns c lp (t vi chc cho n vi ngn).

(3)WiMAX (Worldwide Interoperability for Microware Access): WiMAX tng tnh Wi-Fi v khi nim nhng c mt s ci tin nhm nng cao hiu sut v cho php kt ni nhng khong cch xa hn.

(4)IEEE 802.11n: Phn mi b sung vo b tiu chun mng ni b khng dy IEEE802.11 do nhm cng tc 11 ca U ban tiu chun mng ni b (LAN)/mng khuvc th (MAN) thuc IEEE (Vin K thut in v in t M xy dng). Tiuchun 802.11n s lm cho mng hot ng tm xa hn nhng mng hin ti.(5)3G: Cng ngh in thoi di ng th h th 3. Nhng dch v s dng cng nghny cho php truyn d liu m thanh (gi in thoi) v khng c m thanh (nhti xung thng tin, trao i e-mail v nhn tin).(6)EV-DO (Evolution Data Only/Evolution Data Optimized): Giao thc d liu bngthng rng v tuyn khng dy. Hin nhiu nh cung cp dch v di ng CDMAti nhiu nc trn th gii ng dng EV-DO, gm Venezuela, Mexico, Brazil, Nht, Hn Quc, Israel, M, c v Canada, EVN ca Vit Nam.

(7)UMTS (Universal Mobile Telecommunications System): Mt trong ba cng nghin thoi di ng hin ti. UMTS thnh thong cn c gi l 3GSM phn bivi cc mng khc cng nh nhn mnh s kt hp gia bn cht 3G ca cng nghny v chun GSM.(8)HSPDA (High-Speed Downlink Packet Access): Giao thc in thoi di ngmi; cn c gi l 3,5G (hay "31/2G)

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1. TNG QUAN CNG NGH WIMAX1.1 S ra i ca cng ngh Wimax

Ngy nay t l ngi truy cp bng rng cn rt t, thp hn 20% dn s th gii vthm ch cn nh hn t l ny nhiu. Cu hi t ra l ti sao? L do cc cng nghang tn ti nh DSL, cp v v tuyn c nh c cc hn ch nh chi ph lp t

cao, c vn lp vng, tc ng ln (upstream) cn nng cp, gii hn LOSv tnh hng m km. Chnh v s hn ch ny m chng ta a ra gii php truycp internet bng rng c nh/ di ng c th s thay th nhng cng ngh hin nav truy cp bt c ni u v bt c khi no vi tc cao, chnh l cng nghtruy cp v tuyn bng rng Wimax.

WiMax l cng ngh mi do t chc IEEE pht trin tp trung gii quyt cc vn trong mng v tuyn ngoi tri bng rng im im, im a im. N cnhiu ng dng, nh kt ni tm xa (ko di) cho nh ring v thng mi v k

ni backhaul cc im nng ca mng Wifi.Trong khi Wimax cha c lch s pht trin ph bin nh Wifi (802.11), nhngchun ny ang c li th ng k c s h tr t cc nh sn xut tn tui lnnh Intel v cc cng ty c phn ln khc.... cng ngh Wimax (chun 802.16) quantrng nh Internet cho php kt ni ti a ln n 5 t ngi. Vi vic cung cp khnng kt ni bng rng khng dy, cng ngh Wimax cho php thc y s phttrin cng ngh mi to iu kin thun li mang li s pht trin gio dc v y ttt hn, tng nng sut cng-nng-thng nghip v thu nhp cho ngi dn, khnng tip cn chnh ph in t v xy dng cc thnh ph in t.

Wimax c th s dng lm mng v tuyn theo nhiu cch ging nh giao thc rt ph bin hin nay l Wifi. Wimax c th l giao thc th h th hai m cho php sdng bng thng hiu qu hn, gim nhiu, m cn cho php tc d liu cao hv khong cch xa hn.

Chun IEEE 802.16 nh ngha cc c tnh k thut giao thc vin thng. Din nWimax to c hi tim lc cc thit b ang th nghim ca cc nh sn xutkhc nhau tng thch vi nhau, cng nh thit k mt nhm cng ngh chuyn

dng khuyn khch pht trin v thng mi ha cng ngh. Chng bao lu naWimax s c chp nhn tr thnh cng ngh truy cp Internet v tuyn mni trn th gii.

1.2 Chun IEEE 802.16

C th nhiu nh cung cp dch v v vn hnh cn xa l vi chun IEEE 802.16(WiMAX) nhng y s l cng ngh khng dy mang tnh cch mng trong ngnhcng nghip dch v khng dy bng rng. Chun 802.16, giao tip dnh cho h

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thng truy cp khng dy bng rng c nh cn c bit n vi tn chun giaotip khng dy IEEE WirelessMAN. Chun c thit k mi hon ton vi mctiu cung cp nhng trc kt ni trc tip trong mng ni th (Metropolitan Area Network-MAN) t bng thng tng ng cp, DSL, giao din T1/E1 ph binhin nay.

PAN

LAN

MAN

WANIEEE 802.20

IEEE 802.16Wireless MAN

IEEE 802.11

IEEE 802.15 ETSIHIPERPAN

ETSIHIPERLAN

ETSI HIPERMA N& HIPERACCESS

3GPP EDGE(GSM)

Hnh 1 Chun khng dy ton cuThng 1/2003, IEEE cho php chun 802.16a s dng bng tn t 2GHz n11GHz; rng hn bng tn t 10GHz n 66GHz ca chun 802.16 pht hnh thng4/2002 trc . Nh c tnh khng dy m cc nh cung cp dch v v vn hnhc th trin khai ng trc d dng, tit kim chi ph n nhng vng a hnhhim tr, m rng nng lc mng ti nhng tuyn cp ng trc ang qu ti; c bit ng ph khng b "o ln lp xung" nh hin nay. Thit b pht IEEE802.16a c th lp ngay trn nc ta nh ch khng cn u t t trn thp caohoc nh ni nh nhng cng ngh khc. H thng 802.16a chun c th t n bn knh 48km bng cch lin kt cc trm c bn knh lm vic 6-9 km.Trong qu trnh pht trin 802.16, tnh lin thng lun c cao. u tin, dinn Worldwide Interoperability for Microwave Access (WiMAX) c thnh lpvo nm 2003 v qui t c nhiu cng ty hng u nh Intel, LG Electronics,Motorola, Fujitsu, Siemens... thc y cc nh sn xut h thng truy xutkhng dy bng rng a ra thit b tng thch IEEE 802.16, WiMAX cng hptc cht ch vi lin minh Wi-Fi h tr tt chun IEEE 802.11. t c slin thng, WiMAX buc phi to mt s System Profile tng ng vi qui nh s

dng tn s khc nhau ca tng khu vc a l. V d, nh cung cp dch v ti chuu dng bng tn 3,5GHz vi bng thng 14MHz i hi thit b h tr knh bngthng 3,5MHz hoc 7 MHz, chc nng TDD (Time Division Duplex) hoc FDD(Frequency Division Duplex). Tng t, nh cung cp dch v Internet khng dy(WISP) ti M li dng bng tn 5,8GHz UNII nn thit b h thng cn phi h tr bng thng 10MHz v k thut TDD.

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Trong qu trnh xy dng khung chun, 802.16a k tha cc h thng c cth c ng dng rng ri nh thit k ban u. OFDMA dng trong 3 lp PHYc thit k m c th iu chnh linh hot, thch ng vi tt c cc knh c rng bng thng t 1,75MHz n 20MHz. Single Carrier Access (SCa) trong Wi-Fic gi li trong 802.16a lm ng lin kt xng sng, trong khi OFDM viFFT (Fast Fourier Transform) 256 im li h tr nhng truy xut c nh bng

thng ln n 10MHz. K thut OFDMA c ci tin da trn OFDM h tr hdi ng tc cao, cho php knh ha d liu ti xung (Downlink-DL) v ti ln(Uplink-UL), n nh hng s t l gia kch thc FFT vi rng knh...

Hnh 2: Cu trc802.16 cng nghip.

Lp MAC 802.16 c thit k h tr ng dng im-a im da trn CSMA/CA(Collision Sense Multiple Access with Collision Avoidance). MAC AP 802.16 qunl ti nguyn UL, DL v gm lun c chc nng nh thi truyn v nhn. LpMAC cn c mt s chc nng h tr ng dng din rng m tnh di ng khng

nh nh tch hp dch v di ng: bnh chn tc thi (realtime Polling Service) vkhng tc thi (non-realtime Polling Service)...; ng gi/phn mnh tng hiu qu s dng bng tn; Qun l kha ring t (PKM-privacy key management) bo mt t lp MAC; H tr pht a lung; Chuyn mch tc cao; Qun lnng lng. PKM phin bn 2 cn c kh nng kt hp vi giao thc xc thc mrng (EAP-Extensible Authentication Protocol).

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Tin chun Hu chun

Sau khi chun ha, nh sn xut thit b chcn tp trung y nhanh thit k v gim gi

(biu din bng cc lp mu xanh).


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Vi tc ti d liu ln n 75Mbps, mt knh p ng ca trm 802.16a honton nng lc cng lc phc v 60 khch hng kt ni cp T1 v hng trm ktni DSL gia nh, vi bng thng knh l 20MHz. Trong thc t, t hiu qukinh t, cc nh vn hnh v cung cp dch v thng phi chp nhn cn i phcv thnh phn khch hng doanh nghip doanh thu cao vi thnh phn thu bao gianh s ng. V th, chun 802.16a h tr thit thc nh vn hnh mng, cho

php cu hnh mc u tin cho tng cp dch v. Nh th, doanh nghip c th tch u tin dch v cp T1 cho doanh nghip hoc dch v tc DSL chongi dng gia nh. c t 802.16a cn bao gm tnh nng bo mt v QoS cnthit h tr nhng dch v thoi v video trc tuyn. Dch v thoi 802.16 c thdng k thut thoi TDM (Time Division Multiplexed) hoc VoIP (Voice over IP).

1.3 ng dng cng ngh WiMAX

Sau khi ra i, 802.16a nhanh chng c trin khai ti chu u, M v th hinmt s li ch c th.1.3.1 Mng ng trc:

802.16a l cng ngh khng dy l tng lm mng trc ni cc im hotspotthng mi v LAN khng dy vi Internet. Cng ngh khng dy 802.16a cho php doanh nghip trin khai hotspot 802.11 linh hot khi gp a hnh him tr, hi thi gian ngn v nng cp linh hot theo nhu cu th trng.

Chun 802.16a cho php trin khai nhng mng trc tc cao, chi ph thp. Tichu u, ni cc nh vn hnh t chp nhn chia s cp trc vi i th cnh tranhmng trc WiMax c t pht trin v c s dng trong 80% thp sng. Ringti M, do c iu lut qui nh cc nh cung cp dch v th ba phi thu tuyn cptrc t nh cung cp mng trc Internet nn tc ng dng WiMax chm hnchu u. Tuy vy, t l ng dng WiMax lm mng trc cng chim n 20%v sp ti s pht trin rt nhanh v FCC ang chun b b rng buc v tuyn cptrc vi cc nh cung cp dch v th ba. i vi cc nc ang pht trin th gii php kt ni khng dy 802.16a cho php nng cp nng lc dch v nhanh chngtheo nhu cu thc t m khng phi lo ngi v vn o ng, thay i kin trh tng.

1.3.2 Kt ni mng khng dy doanh nghip:Chun 802.16a c dng lm c s lin thng cc mng LAN khng dy,hotspot WiFi 802.11 hin c. Doanh nghip c th t do m rng qui m vn phngm mi trng mng cc b vn c lin lc nu c mng trung gian khng dychun 802.16a. Nhn rng hn, doanh nghip c th trin khai mng LAN khngdy thng nht cho tt c vn phng trong phm vi mt quc gia.

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1.3.3 Bng rng theo nhu cu:

H thng khng dy cho php trin khai hiu qu ngay c khi s dng ngn hnVi s h tr ca cng ngh 802.16a, h thng hotspot 802.11 vn nng lc phc v dch v kt ni tc cao ti nhng hi ch, trin lm c n hng ngkhch. Nh cung cp dch v c th nng cp hoc gim bt nng lc phc v cah thng theo nhu cu thc t, gip nng cao hiu qu kinh doanh, tng tnh cnhtranh ca doanh nghip.1.3.4 M rng nhanh vng ph sng

H thng 802.16a cho php ph sng n nhng vng him tr, thiu cp trc yDo tuyn cp DSL ch c th p ng trong bn knh 4,8km tnh t trm iu phitrung tm nn cn nhiu vng a hnh him tr m nh cung cp khng th vi tiThng k gn y cho thy c hn 2.500 nh cung cp dch v khng dy (WirelessISP) a phng hot ng hiu qu trn 6.000 th trng ti M. Khng ch trinkhai dch v d liu tc cao, h thng cn cho php trin khai dch v thoi chonhng ngi dng vng su vng xa.1.3.5 Roaming dich v

Vi cng ngh IEEE 802.16e m rng t 802.16a, trong tng lai ngi dng sc h tr dch v roaming tng t in thoi di ng, t ng chuyn kt nn nh cung cp dch v Internet khng dy a phng ngay khi ra ngoi vng ph sng ca mng gia nh, cng ty. -D kin n 2006, cng ngh WiMAX sc tch hp vo my tnh xch tay, PDA nh Wi-Fi hin nay v tng bc hnhthnh nn nhng vng dch v khng dy bng rng mang tn "MetroZones".

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Hnh 3 M hnh trin khai mng WIMAX1.4 Gii thiu chung v cng ngh Wimax

Cng ngh truy nhp v tuyn bng rng Wimax l tn vit tt ca cm tWorldwide Interoperability of Microwave Access. M t WiMAX trong b tiuchun IEEE 802.16 Wireless Metropolitan Area Network (MAN) cho rng cc hthng tng thch vi Wimax s c s tng tc gia v tuyn c nh vi Internetcable v DSL thng.

Mt h thng Wimax tiu biu gm c 2 phn: Mt trm gc Wimax: Trm gc gm cc khi in t t trong nh v mt

anten Wimax. Tiu biu, mt trm gc c bn knh ph sng ln n 10 km(Theo l thuyt, mt trm gc c bn knh ph sng ln n 50 km, tuy nhindo iu kin thc t nn ch gii hn bn knh khong 10 km). Bt k nodev tuyn nm trong vng ph sng iu c th truy cp n Internet.

Mt my thu WiMax: my thu v anten c th l mt hp n hay l mtcard PCMCA gn vo trong my tnh hoc laptop. Truy cp n trm gcWimax ging nh truy cp n im truy cp ca mng Wifi, nhng c vng ph sng th rng hn.

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Nhiu trm gc c th kt ni ln nhau bng cch s dng cc lin kt Viba backhaul tc cao. iu ny cho php cc thu bao Wimax chuyn vng t trmgc ny n khu vc trm gc khc, cng tng t nh chuyn vng trong mngin thoi t bo.

Cc c im k thut quan trng trong cng ngh Wimax (Wireless MAN IEEE802.16)

Bn knh ph sng: 50 km tnh t trm gc Tc ti a: 70 Mbps Non-Line-of-sight (NLoS) gia ngi s dng v trm gc. Cc bng tn s: 2-11 GHz v 10-66 GHz (bng ng k v cha ng k) nh ngha c hai lp MAC v PHY v cho php nhiu chi tit k thut lp

PHY.

Mng MAN v tuyn Wimax da trn b tiu chun IEEE 802.16 cung cp truy cpInternet v tuyn bng rng ti nh ring v doanh nghip vi cc ph thp. Tc truyn chia s ln n 75Mbps t mt trm n, c th cung cp truy cp bngrng m khng cn c mt ng truyn vt l t ngi dng u cui ti nh cuncp dch v. Giao dch v ti khch hng u cui ging nh giao knh truyn300Kbps cho nh ring v 2Mbps cho doanh nghip.

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Giao dch v ti khch hng u cui ging nh giao knh truyn 300Kbps cho nhring v 2Mbps cho doanh nghip. (Chun m t phn cui)

Cng ngh ny c bit hu ch cho cc vng nng thn v cc ni khc m cha c truy cp bng rng. C s h tng hin hu do cc nh cung cp ko cp shu ch cung cp dch v ti nhng vng cn gii hn, ph hp cho truyn cp; mrng c kh nng cung cp dch v bng rng th chi ph cao, v th s ngn cn pht trin n nhng vng c mt dn c thp.Cng ngh DSL gii hn ngi dng u cui phi trong vng 3 dm t tng PTC hoc trm phn phi ca nh khai thc, v th nhiu ngi c bit nhngvng nng thn th cng ngh DSL khng p ng c. Ngc li vng ph sngrng v mi trng truyn khng dy gip cho Wimax vt qua nhng gii hnny. Mc d vng ph sng ti u l 4-6 dm vi tc cao, tuy nhin khi gim tc s tng khang cch ln xp x 30 dm. Chi ph tng i thp trin khai dchv Wimax c lin quan n cp hoc DSL, s khuyn khch cc nh cung cp dch

v m rng vng ph sng ti nhng khch hng nh ring v doanh nghip miTrong khi cng ngh ny khng cung cp dch v bng rng chung, lc ny nn mrng vng dch v hin vt qu gii hn ca h v s c th ph ht cc vng dc.

Wimax ha hn cung cp d phng nhanh cc dch v bng rng. Thng thngPTCL yu cu nhiu thng mi cung cp ng E1 mi v cc kt ni mc d liuthng mi cho cc khch hng doanh nghip di iu kin tt nht, chi ph lpt cn kh cao. Nh khai thc DSL b gii hn cung cp cc kt ni tc cao ch

trong nhng vng h c thit b nh trm v tng i. Da vo kch thc doanhnghip v ti nguyn d phng pht trin t bin trong cc nm va qua v s pht trin trong tng lai nh hng theo t chc thng mi th gii WTO. Scn tr ca thi gian lp t lu v chi ph d phng cao s kim hm s pht trinca n. Mng backbone trong nc ta cng vi tuyn trung k chnh to cho n hinr u im vt tri ca cng ngh ny trin khai bng rng ti cc vng suvng xa v xa cc tuyn trung k.

K hach pht trin thng bo trong din n pht trin ca Intel, Intel s cho ra

mt chip Wimax u tin nm 2004. Kt ni bng rng c nh ti nh ring vdoanh nghip c a ra trong b chun 802.16a ( c chun ha vo thng 01nm 2003), tip theo l truy cp di ng ti my tnh xch tay theo b chun802.16e (ang hp chun). Chun 802.16a cho php cng ngh ny hat ng vng tn s t 2-11 GHz v khng b gii hn LOS. Tuy nhin, cc cng ty khccng c s pht trin ng k nh Navini, Proxim, Alvarion,

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Nhiu c hi n cho cc cng ty ny pht trin nhng ng dng da trn nhngu im ca cng ngh mi ny. Gii php kinh doanh b sung nh gim st khuvc, phng vin tin tc, chm sc sc khe ti nh, cn b cng ty cng ch, ccdch v yu cu kt ni vi cc my tnh doanh nghip ca h hoc vi h thnInternet. VPN v cc dch v tng t khc cng c th tn dng c cc u imca cng ngh ny, d cn trang b li mt s cng c.

Mang bng rng ti cc vng cha pht trin, cha c dch v, h tng c s mngdy dn bng rng cho nh ring, doanh nghip cha tn ti hoc khng ng tincy. m rng dch v Internet ti vng su, vng xa, nh cung cp dch v phicung cp c s h tng vin thng mt t mi, bt buc phi chu gi c dch v rcao. y l nguyn nhn chnh lm cho t trng dch v din thng nc ta thp. t c li rng hp l v khang thi gian c th chp nhn c, chi ph htng c s phi c gi mc thp v c qun l cht ch. Yu t chi ph givai tr rt quan trng nhng vng dn c tha tht, cha trin khai cng ngh

vin thng truyn thng.Cng ngh v tuyn tm xa ha hn mang li dch v c ch cho nhiu vng mcng ngh dy dn truyn thng thc t cha c. Theo mt s chuyn gia nh SeanMaloney (ph ch tch hi ng qun tr Intel v tng gim c ca nhm vinthng Intel), mt s hng truyn thng ang xem xt cung cp dch v Wimax dinrng nhng quc gia pht trin v ang pht trin.

Th trng kinh doanh nh hin nay c phc v mc ln bi v tuyn imim hoc mng cp DSL phm vi nh cho kt ni bng rng. Hn na gii hn v

tr tho lun ri, cc cng ngh ny in hnh l cung cp bng thng upstream bgii hn, m gii hn ng k cho nhng khch hng doanh nghip, ty vo nhu cuc th ca h. Cc doanh nghip ny c k hach t my ch Web, h tr hoc lpk hach h tr ngi dng xa c nhu cu, m c th ni tm thy gii hn ny c ngha rt c bit. Hn na, t khi cc nh cung cp mng dy dn xy dng ni ch yu phc v th trng truyn hnh cp, th khi h khng cn xydng nhiu khu vc thng mi na.

Mng Wimax cung cp tng tc vi knh phn phi ny t khi h khng ph

thuc vo h tng c s on cui hin c v h cung cp bng thng upstream lnhn rt nhiu so vi cp v DSL. Cc mng ny cng c tin cy cao t khi ccnh cung cp lp thm cell ti nhng vng dch v vi mc chi ph thc thp hn sovi m rng mng cp hoc DSL.

Trong khi cc quc gia pht trin c sn mng ln cp v/hoc DSL phc vkhu vc doanh nghip v dn c ng. V vy, cc phng thc phc v mi phic thi gian cnh tranh trn th trng ny, khi m khch hng y c dch v

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phc v tt. V vy, Wimax em li nhiu li ch vng su, vng xa v nhngvng cha c dch v bng rng, li ch mang li cho nh cung cp y l khthp v cn tr s pht trin chung. iu kin nc ta th kh tri ngc, chng takhng c cu trc bng rng thnh ph v nhng vng su, vng xa, Wimax skhng c dch v i lp.

Mt kha cnh ca chun 802.16a ang tn ti s hp dn cc nh cung cp dch vv cng nh khch hng u cui l cung cp mc a dch v. Trm gc ncung cp ng truyn vi tc chia s d liu ln n 75 Mbps v ti khchhng doanh nghip bo m c tc 2 Mbps (tng ng lung E1), cng nhti khch hng nh ring dch v 128 kbps khng bo m best-effort.

Theo nhu cu ca tng vng nn a ra chun a dng v dch v rng cho nhcung cp. Cung cp dch v mm do v cu trc ti tng loi khch hng, mt nhcung cp Wimax c th hp dn bi tnh a dng v nhu cu cho tng im phn phi.

vng su, vng xa khong cch gia cc khch hng l ln, 802.16 h tr iuch thch nghi adaptive modulation cho php t ng tng vng ph sng ngthi s gim thng lng nhng ni cn thit. iu ch (nh QAM 64) cung cpthng lng cao vi vng ph sng ph ti a.

Lc iu ch do trm gc gn ng tu vo khong cch n my khch, cnnh thi tit, nhiu tn hiu v cc nhn t nht thi khc, Tng lai s mm dony cho php cc nh cung cp dch v p ng cc khu vc phn phi ring l, vcho php dch v Wimax mang li li ch cho cc vng a l v dn c rng.

Chun 802.16 cng h tr QoS khc nhau chi phi tha hip gia t l li thc vli tim tng. Kh nng ny cho php cng ngh a ra h tr tt hn ti cc long truyn d liu khc nhau. Hu ht cc loi ng truyn d liu chu ngmc li tim tng ln nhng t l li thc phi c iu khin cht. Mi trnthi gian thc nh truyn thoi v hnh nh, ni cch khc, l yu cu li tim tngthp nhng c mt vi mc li ng truyn c th chp nhn c. V vyQoS khc nhau cho php mt chun truyn d liu bt tay c vi tt c cc dchv khc nhau c hiu qu.

Nguyn tc hat ng

Tht khng d dng c ci nhn nhanh chng cch hot ng ca cng nghWimax. Wimax cung cp hai dng dch v v tuyn:

- l NLOS, loi dch v Wifi, c mt anten nh gn trn my tnh kt ni vithp anten. Trong ch ny, Wimax s dng bng tn s thp 2-11 GHz (gingWifi). ng truyn bc sng ngn hn th khng d dng t do cn tr vt l

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chng c th tt hn lm nhiu x, ch cong xung quanh khu vc chng ngvt.

- i vi dch v LOS, cc im anten a c nh t trn nh nh hay im cchng thng n thp anten Wimax. Kt ni LOS th mnh v n nh hn, v thn c th gi nhiu d liu vi mc li thp. ng truyn LOS s dng tn s caohn ln n 66 GHz. Ti mc tn s cao th nhiu thp v s dng bng thng rnghn.Truy cp kiu Wifi b gii hn trong bn knh t 4-6 dm (vng bao ph khong 25dm vung hoc 65 km vung ging nh vng ca in thoi t bo). Do antenLOS mnh hn, trm pht Wimax gi d liu ti my tnh h tr Wimax hoc bnh tuyn thit lp trong vng bn knh 30 dm so vi trm pht (vng bao phkhang 3.600 dm vung hoc 9.300 km vung). Vng ph sng rng l u imni bt ca cng ngh Wimax.

Bng cch xem xt gim bt gii hn ca vng ph sng v bng thng di ng, schp nhn ph bin ca mng MAN v tuyn s pht trin th trng mi cho phmm mobilized (di ng). Khi khch hng doanh nghip chp nhn dch v Wimaxnhu cu s pht trin gii php thng mi di ng rng, t bit trn c s chun802.16e, trm gc s cung cp dch v trc tip ti thit b di ng u cui ngdng.

Doanh nghip c th s cung cp kt ni trc tip ti field personnel ngang qua khuvc rng tri rng hn cc cng ngh hin nay. Bng thng cao v phm vi cc dchv trn Wimax lin quan ti cc cng ngh v tuyn khc cng to ra nhu cu chocc gii php phn mm mobilized (di ng) m cc cng ngh ph bin hin naykhng s dng chng.

K thut vin dch v, ngi bn hng vng xu, vng xa v i bo dng mith t xy dng thit b ti mng my tnh s c th truy cp ti h thng doanhnghip trung tm t field (vng xu, vng xa). Thng qua thay i s gip xydng nhu cu chung cho gii php di ng, xy dng trn th trng cha pht trinmong mun phn mm di ng.

Chun di ng Wimax s m ra c hi mi cho cc nh pht trin mi hn. V vys pht trin ca mng MAN v tuyn ni chung gii php doanh nghip nn x lkh nng di ng p ng s mong mun ca khch hng.

Phn mm client ang gia tng phi x l kh nng kt ni ri rc li vi nhau, tr d liu c lin quan t mng trung tm v cung cp ng b d liu mnh mvi cc h thng back-end. Khch hng mong i cng ngh ny c hp chun

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1.5 Tnh hnh chun ha cng ngh Wimax Thng 7/1999, IEEE thnh lp nhm lm vic v truy cp v tuyn bng

rng gi l BWA xy dng chun mng MAN v tuyn c kh nng ngdng ton cu.

Kt qu sau 2 nm lm vic cng b chun u tin hat ng bng tn 10-

66 GHz c chp nhn vo 12/2001. Thng 3/2002, IEEE thnh lp nhm nghin cu v truy cp v tuyn bng

rng di ng gi tt l MBWA. B tiu chun IEEE 802.16 v giao din v tuyn cho h thng truy cp v

tuyn bng rng c nh c cng b vo ngy 8/4/2002. Nhm nghin cu b sung sa i chun 802.16 m rng sang bng tn cp

php v khng cp php t 2-11 GHz v c nhm lm vic IEEE802.16 v sau l y ban qun l IEEE 802 chp nhn lm chun IEEE802.16a vo 29/1/2003 v c cng b vo 01/04/2003.

Nhm nghin cu b sung sa i chun 802.16 pht trin profile h thng bng tn 10-66 GHz gip c im tng tc gia cc thnh phn v c IEEE-SA Standards Board chp nhn nh chun 802.16c vo ngy11/12/2002.

D n 802.16d c thay th bi 802.16-RE-VD c IEEE-SA standardsBoard chp nhn vo ngy 11/09/2003 v cng b nh chun IEEE 802.16-

2004 thay th cc b tiu chun 802.16-2001, 802.16c-2002 v 802.16a-2003. D n 802.16e v lp MAC v lp vt l cho di ng v c nh bng tn

cp php, c IEEE-SA Standards Board chp nhn vo 07/12/2005 v ch c cng b vo 01/2006.

D n 802.16f v qun l thng tin c IEEE-SA Standards Board chpnhn vo 22/09/2005 v cng b vo ngy 01/12/2005.

D n 802.16g v qun l th tc v dch v, d n 802.16h ang pht trin.

Phin bn tiu chun u tin ca Wimax l 802.16 tp trung x l trong vng bngtn 10-66 GHz; phin bn mi hn l 802.16a hat ng trn ph tn 2-11 GHz.Kt hp c hai 802.16 v 802.16a nh ngha mt lc iu ch sng mang ngin cho ng lin kt LOS bng tn pha trn 10 GHz. Hn na, nh nghathm hai giao thc iu khin truy cp mi trng OFDM cho ng lin kt NLOS pha dui 11 GHz v TDD/ FDD. B tiu chun khng nh ngha c th

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QoS v thut ton lp chng trnh, nhng li cho php thc thi mm do gia ccnh cung cp.

2. SO SNH WIMAX VI WIFI V 3GV hin ti pht trin nht l 2 cng ngh Wi-Fi v 3G nn ta c th so snhWIMAX vi 2 cng ngh ny m thi. Cng ngh 3G tn dng tn s v phn ph

sng ca mng di ng sn c nn vng ph sng ln nhng hn ch v tc (38kbit/s). Nh vy c th thy trc Wimax l cng ngh s vt tri so vi 2 cngngh trn c v tc ln vng ph song.

2.1 Cng ngh WiFi:

ch yu s dng ti tn s 2.4 GHz vi bn knh nh khong 50m, tc ph bil 2Mbit/s (s dng k thut OFDM: Truy cp a phn tn trc giao c th ln n54Mbit/s).

Wifi Wireless Fidelity l tn goi m cc nh san xut t cho mt chun kt nikhng dy (IEEE 802.11), cng nghs dung sng radio thit l p h thng ktni mang khng dy. y l cng ngh mang v tuyn c thng mai ha tintin thgii hin nay.

Mt mang Internet khng dy Wifi thng gm 3 b phn c ban: im truy c p(Access Point AP); card giao ti p mang (Network Interface Card NIC); v b phn thu pht, kt ni thng tin tai cc nt mang goi l Wireless CPE (Customer Premier Equipment). Trong , Access Point ng vai tr trung tm cua ton mang,l im pht vthu sng, trao i thng tin vi tt cacc my tram trong mang, cho

ph p duy tr kt ni hoc ngn chn cc my tram tham gia vo mang. Mt AccessPoint c thcho ph p ti hng ngn my tnh trong vng phu(khang 150m ) sngtruy c p mang cng lc.

Ti nay, Vin Ky Thut in v in T cua My (Institute of Electrical andElectronic Engineers - IEEE) pht trin ba chi tiu ky thut cho mang LANkhng dy gm: chun 802.11a tn s 5,1GHz, tc 54Mbps; chun 802.11b tn s2,4 GHz, tc 11Mbps; vchun 802.11g tn s2,4GHz, tc 54Mbps.Cc ng dung mang LAN, hiu hnh hoc giao thc mang, bao gm ca TCP/IP,

c th chay trn mang khng dy WLAN (Wireless Local Area Network) tngthch chun 802.11 ddng mkhng cn ti hthng c p dn.

Wifi c bit thch h p cho nhu cu s dung di ng v cc im truy c p ngngi dng. Ncho ph p ngi s dung truy c p mang ging nh khi s dung cngngh mang my tnh truyn thng tai bt c thi im no trong vng phu sng.Thm vo , Wifi c linh hoat vkhanng pht trin mang ln do khng bianhhng bi vic thay i lai vi tr, thit klai mang my tnh. Cng vl mang khng

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dy nn Wifi khc phuc c nhng han chvng c p vt l, giam c nhiuchi phtrin khai thi cng dy mang vkhng phai tc ng nhiu ti c sha tng.

2.2 Hn ch ca Wifi

Gi ca l tr ngai u tin i vi dich vu ny. Chi ph ban u cho vic thit l pmt mang Wifi thng tn km hn nhiu so vi mang LAN thng thng. Vit Nam, chi phcho mt mang khng dy, gm tin thu ng mang, 3 Access Pointv khoang hn 40 card modem khng dy cng cc thit bi ng b khc tnkhoang gn 100.000 USD. Thc ra, chi ph ny khng cao hn l bao so vi victhit l p mt mang LAN vi s ngi dng tng ng, m theo mt doanh nghi pang s dung Wifi th tr ngai nm phn thit bi ng b i km. Mt my tnhthng thng kt ni vo mang chi cn mt oan dy nho, cn truy c p vomang khng dy phai cn ti mt card mang khng dy c git 60 200 USD/cihoc l my tnh tch h p sn cng ngh ny. Cng ngh khng dy c bit tngcng sc manh cho cc thit bi tnh ton di ng nh my tnh xch tay, PDA hay

Pocket PC. Ngoi chi ph, bao mt thng tin ang c cc nhquan lc bit quan tm. Dotnh cht cua mang khng dy l phu sng rng nn nu khng c nhng c ch kim sot truy c p v bao v thng tin hu hiu th y se l mi trng tt cho kexu thm nh p phhoai, nh c p thng tin...

Mt vi tr ngai nho khc cng c th anh hng ti kha nng ph dung cua Wifinh my tnh truy c p bng cng ngh Wifi se hao pin rt nhanh, do vy khi s dung dich vu Wifi phai mang theo dy ngun; pham vi phu sng cua Wifi bi hanch...2.3 Cng ngh 3G

Cc tiu chun 3G cho cng ngh v tuyn th h th 3 ch yu tng cng truycho thoi v s liu t 9,5 k 2Mbit/sec

2G l cng ngh ch yu cho in thoi di ng hin ti

Bao gm :

- Cc cuc gi thoi

- Nhn tin nhn n gin

- Tc 10 Kbps

- Thi gian ti bn nhc MP3 di 3 pht t 31- 41 pht.

Cng ngh v tuyn 2.5 G : bao gm :

- Cc cuc gi thoi/fax

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- Th thoi

- Gi v nhn tin nhn th in t

- nh v

- Cp nht

- Tc 64-144 Kbps

- Thi gian ti bn nhc MP3 di 3 pht t 6- 9 pht.

Cng ngh v tuyn 3 G

Kt hp gia T di ng, my tnh sch tay v TV

- Cc cuc gi thoi

- Roaming tan cu

- Gi v nhn th in t

- Duyt Web tc cao- nh v, nh hng.

- Hi ngh truyn hnh

- Xem truyn hnh qua mng

- Ghi nh , nhc nh lch trnh in t.

- Tc 144k-2 Mbps

- Thi gian ti bn nhc MP3 di 3 pht t 11s n 1,5 pht.

Cc kh nng ca 3G :

- H tr chuyn mch gi tc cao

- 144 Kbps hoc cao hn cho lu lng di ng cao

- 384 Kbps cho ngi i b

- 2 Mbps hoc cao hn cho thu bao trong nh

- Kh nng lm vic kt hp chuyn vng

- Chia s thng tin v tc gia cc nh cung cp- Ghi chi tit cc cuc gi thng thng

- Hin trng ngi s dng

Hin ti, cc mng di ng Vit Nam ang s dng cng ngh t 2,5-3G. y lcng ngh dnh cho nhng lp khch hng khc nhau, c truy nhp Internet nhngchuyn v thoi l chnh . Ngc li, cng ngh Wimax c bng rng hn, li c

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s dng chuyn truy nhp Internet c dch v thoi, c tnh nng thoi. V d nhmt s dch v gia tng da trn cng ngh Wimax nh gi IP Phone qua my tnh,VoIP...

Qua nhng ch tiu k thut v ng dng ca cc cng ngh trn y ta c th thytrong tng lai gn khi cng ngh Wimax cn gi thnh cao, u t cha th nhanhc, Wifi l cng ngh dnh cho vng ph sng nh, tc cao nhng nhiungi truy cp cng lc th tc s gim v nh vy, c th chia s bng thngcng nh chi ph gia cc thu bao, ch yu dnh cho mng ni b. Cng ngh 3Gvng ph sng ln dnh cho mt cho s t khch hng m truy cp mng l dch vth yu sau thoi nhng li cn thit khi di ng. Do ta c th thy 3 cng nghny trc mt s cng tn ti v b xung cho nhau.

thy trong tng lai gn cc cng ngh ny cng tn ti:

* Hng Intel va cng b tch hp c tnh nng wifi v Wimax trong cng mtcon chip trang b cho my tnh xch tay. Sean Maloney, Tng gim c b phndi ng ca Intel, 8/3/2006 trnh by k hoch trin khai WiMax trong Din ncc nh pht trin IDF ti San Francisco (M). Maloney khng nh Wi-Fi vWiMax s cng xut hin trong vi x l c tn m Ofer khong 3 nm ti. Khi ,ngi tiu dng s c th d dng chuyn i gia cc im truy cp hot spot vmng khu vc.

* S kin Nokia tuyn b pht trin WiMax cho in thoi khin khng t ngithc mc liu c phi hng ny khng cn quan tm n cng ngh 3G. Tuy nhinnh sn xut Phn Lan khng nh hai cng ngh ny s cng tn ti song song. Nokia qu quyt rng k hoch pht trin mng tc cao khng dy trn din rnWiMax vi Intel khng c ngha l hng quay lng li chun di ng 3G bi "trnthc t, 3G s h tr c lc cho Wimax v khng th hnh thnh mt dch v thayth n", theo li Simon Beresford-Wylie, Ph gim c iu hnh ca Nokia.Beresford-Wylie cho bit Nokia quyt nh hp tc cng Intel v hng nhn thyWiMax l mt phng tin truyn/nhn d liu quan trng, nhng s ch hot nghiu qu ti nhng ni c dch v 3G iu phi lu thng. Nokia cng b khoch chi thit tng tc truyn d liu qua mng di ng ln ti t nht 14

Mb/giy. Bc u, h s bt tay vo vic ti u ha chun 3G hin ti (384Kb/giy), cui nm nay, tc 1 - 2 Mb/giy cho in thoi s chnh thc hong ti nhiu khu vc. Tip , khi 3G v WiMax cng tn ti, hng s phttrin gii php nng tc ln 14 Mb/giy.

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3. GII PHP CA CC NH SN XUTc s h tr mnh m ca nh sn xut chipset hng u th gii Intel, cc nhsn xut sn phm Wimax ch yu da trn loi chip set h tr cng ngh Wimaxca Intel.

Dng sn phm Wimax u tin da trn chun 802.16a, hot ng ph tn quc

t 3.5 GHz v 10.5 GHz v ph tn cp php 2.5-2.7 GHz M, ph tn cha cp php 2.4 GHz v 5.725-5.825 GHz trn phm vi rng.

3.1 Gii php ca Intel :Gii php Chipset Intel: i mi nn bng rng v tuyn c nh Wimax

Chipset Intel PRO/Wireless 5116 tch hp cao tun theo chun IEEE 802.16-2004hat ng c 2 bng tn s v tuyn cp php v khng cp php. Chipset ctch hp v sp xp hp l quy trnh thit k v a ra gii php pht trin ccCPE hiu qu cao.

Khi kt hp vi cc b khuch i cng sut v RFIC ca cc hng khc, cc nhsn xut to ra cc modem Wimax c nhn c th t ci t trong nh v ngoi tri,lm cc cng cung cp d liu IP tc cao, thoi v hnh nh theo thi gian thcGim chi ph v gia tng tc phn cng chipset Intel PRO/Wireless 5116 s snsng s dng cho cc ODM (Original Design Manufacturer) th ba.

Chipset Intel PRO/Wireless 5116 xy dng xung quanh k thut iu bin OFDMhiu sut cao. Bng thng knh v tc d liu c th lp trnh v h tr cc ngdng thng thng v cc ng dng m rng. Cu trc b x l li i cung cpcho cc nh sn xut cc chc nng c th lp trnh v mm do cho cc ng dng phn mm v lp MAC ca h. Tch hp lp MAC tc 10/100, x l bo mni tuyn v mt giao din mch iu khin TDM cho cc ng dng IP v cc ngdng thoi truyn thng.

Cng vi chipset Intel PRO/Wireless 5116 l mt b cng c pht trin phn mm(SDK) cung cp cho cc nh lp trnh cc cng c cn thit khai thc kh nnglp trnh ca thit b. B iu bin v cc API RF, cc b iu khin c lin quan vv tuyn, Ethernet, v cc thit b TDM cho php cc nh lp trnh tru tng ha

phc tp phn cng b iu bin v tp trung vo pht trin ng dng v lpMAC ca h.

Cc c tnh ni bt ca chipset Intel PRO/Wireless 5116

Modem Tch hp SoC mc cao theo chun IEEE 802.16 -2004 256 OFDM PHY h tr bng thng knh ln n 10MHz.

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Cc ch song cng TDD v H/FDD Concatenated Reed-Solomon and Convolutional Encoding Forward Error

Correction Cc phng php iu ch (BPSK, QPSK, QAM16, QAM64) Tng cng h tr kho lin kt

o Nhn m ha khng gian thi gian

o Uplink knh ph

o o cht lng knh SNR, RSSI

o Kh nng ARQ

Hnh 4: S khi mc cao chipset Intel PRO/Wireless 5116

X l ARM* 946E-S li kp gn vo PHY, MAC v x l giao thc ng dng. DSP gn song song cng vi 3 ALU cho php 3 hat ng phc tp ng

thi cho mi chu k x l OFDM. X l bo mt ni tuyn s dng k thut m ha tng cng (3DES, AES

v RC4).

Cc giao din v I/O Module giao din RF h tr I/F hoc cc thit b v tuyn I/Q bng gc c

thit k cho ph tn cp php v khng cp php.

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Tch hp mt cp ADC v DAC, v mt PLL (Phase Locked Loop) hiu sutcao iu khin chuyn i.

Tch hp lp MAC 10/100 Ethernet vi giao din MII vo PHY bn ngai. Giao din TDM cho cc ng dng thoi tng t truyn thng hoc kt ni

ni T1/E1. Tch hp thm cc cng I/O v cc giao din h thng

o Giao din b nh m rng SDRAM v Flash cc giao din sa liv kim tra.

o Cc GPIO c th lp trnh

Hnh 5 S h thng CPE s dng chipset Intel PRO/Wireless 5116

Tiu chun do Intel l thnh vin son tho:

Hng ch to chip hng u cho my tnh v in thoi di ng , thnh vin ch

cht ca Wimax forum, xy dng han thin tiu chun 802.16 c c nh v ding (802.16-2004 v 802.16e).

Tnh hnh S dng bng tn trn th gii:

North America, Mexico 2.5 GHz and 5.8 GHz

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Central and South America 2.5 GHz, 3.5 GHz and 5.8 GHz

Western and Eastern Europe 3.5 GHz and 5.8 GHz

Middle East and Africa 3.5 GHz and 5.8 GHz

Asian Pacific 3.5 GHz and 5.8 GHz

M hnh cho mng Wimax c nh:

Hnh 6 M hnh cho mng Wimax c nh

Trong m hnh trn gii php Wimax c nh c dng thay cho ng truyn,tha mn tiu chun 820. 16-2004. Do cng ngh wimax c th ph sng phm vin khong 50 km v tc ng truyn ln ti khong 75 Mbps (l thuyt). y n ng vai tr mt ng T (nh dch v c cung cp bng dy).

- Dng antena imim kt ni nn c ly l rt xa.

- Cc thu bao mun kt ni vi trm gc dng antena im a im.

- kt hp wifi cho vng nh cng cc thu bao wimax (theo chun802.16 REV E ) kt ni trm gc, m hnh ny to ra vng ph sngcho rt nhiu ngi s dng.

u im khi s dng gii php Wimax c nh dng tn s c cp v khngc cp php hn hn khi dng dy dn: Cc tiu chun 802.16-2004 h tr cho rng bng tn cng nh s dng li cc knh tn s, do vy tng nng lc mngCc tiu chun ny cn h tr vic iu khin cng sut pht v o kim cht lngknh nh mt cng c s dung hiu qu ph tn s. Tiu chun c to ra nn

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s ngi s dng trn 1 knh RF t hng trm ln hng nghn. H tr a knh nncc nh sn xut thit b p ng c nhu cu a dng ca th trng.

Bng tn cp php : 2.5 v 3.5 GHz :c dng ch yu trn th gii bao gm bc M, M la tinh,ng v Ty u, v mt phn chu thi bnh dng, c thkhc nhau bng tn nhng trong di 2.6->4.2 GHz v u th hn di tn khngcp php l : cng sut ng xung ln nn c li cho anten trong nh.

M FCC (Federal Communications Commission) truy nhp bng rng trc yl MMDS trong di m l 2.495 MHz n 2.690 MHz nay cu trc li 2.5 GHzdnh cho Wimax.

Bng tn khng cp php: 5 GHz

Hu nh trn tan th gii gii tn ny l khng cp php v bng v tn s sau ydnh cho gii php Wimax:

Bng tn s yu cu cp php C hiu lc ti

2.5 GHz 2.5 to 2.69 GHz CBrazil, Mexicomt

vinc ng nam

v M

3.5 GHz 3.3 to 3.8 GHz, u

tin 3.4-GHz to3.6-GHz

khng phi tt c u tin 3.4 ->3.6

cho v tuyn bngrng ti phn lncc nc

5 GHz 5.25 to 5.85 GHz khng 5.725-GHz to 5.85-GHz, vi quc

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sut pht > 4w do tng vng ph

sng

So snh u th 2 di cp php v khng cp php:

Gii php gii tn cp php:

V nh khai thc phi tr tin nn c tan quyn s dng di tn, di tn ny cngthp hn di tn khng c cp php v vy:

- Chng xm nhp tt

- Cht lng dch v tt hn

- NLOS tt hn do thu tn s thp hn.

Gii php gii tn khng cp php: Gii tn ny khng dnh ring nn d gy nhiucng nh nhiu sn phm c sn xut v khng ch cp php nn :

- Gi thnh thp.

- Nhiu la chn

- Trin khai nhanh.

Hnh 7 M hnh cho gii php gii tn khng cp php

Mt trong nhng vn khi thit lp h tng cho gii php ny l vn chngnhiu ci thin cht lng dch v. Pha thu bao (1) trn hnh phi c Antenc lp t ng chuyn mn cho gc thu ph hp nhn c tn hiu RF tnht.

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Anten pha trm gc (2) phi c gc nghing ph hp, to li ti a, phi c cclink d phng t c s tip nhn tn hiu ti u

Vn phng trung tm ca nh cung cp dch v (CO) (3) gm cc chc nng:

- Yu cu nh dng ngi s dng dch v.

- Lp t chuyn nghip trm gc vi anten c gc thu chun

- Cung cp cho thu bao truynhp bng rng t nht 1 Mbps- Ni vo mng li (backbone) hon ho.

- Ni vo cc dch v thoi, mng in thoi cng cng, cng a phng tin.

- Thc hin qun l lu lng, nh tuyn v tng la.

- Thng k c chn lc cc s liu v mng li

Trm gc (chuyn tip) (4) phi p ng c:

Lm vic lin tc, c cu trc vng chc, an tan vi con ngi v mt sng RF,khng b nh hng bi thi tit n cht lng dch v.

3.2 Gii php sn phm ca SR-Telecom:

Loi sn phm: Trm gc Wimax, nhn hiu thng mi ABS4000

Gii php FWA Wimax i xng ca SR-Telecom kt ni ng thi ti nhiu nhcung cp dch v v h tr cc ng dng yu cu QoS khc nhau, s ng dngtng th Wimax ca ABS4000.

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Hnh 8 S ng dng tng th Wimax ca ABS4000

Trm gc Wimax ABS4000 i xng cung cp truy cp v tuyn bng rng a dngng dng c nh v xch tay, gm Wi-Fi, Backhaul VPN, Internet tc cao, inthoi VoIP, lung m thanh v hnh nh, cc ng dng theo thi gian thc nh hingh truyn hnh v tr chi trc tuyn.

Vi kinh nghim 10 nm trong cng ngh OFDM ca SR-Telecom, ABS4000khng ch tun theo cc c im c bn ca Wimax m cn c thm cc c im

ty chn nh: MIMO, m ha khng gian, Hybrid ARQ v knh ph (Sub-channelling). Kt qu chnh l do c tnh i xng m cng ngh hot ng hiuqu hn v ph sng c iu kin NLOS.

Thit b ABS4000 hot ng bng tn 3.5GHz v h tr (hosts up) ti a 6 sectos dng profile FDD trong cc knh 1.75 hoc 3.5 MHz. N h tr cc my trmthu bao theo chun Wimax.

Hn na, vi h thng qun l mng (NMS) i xng, cc nh khai thc c thqun l hiu qu mt s lng cc trm gc v thu bao khng gii hn.

c im thit b Wimax ABS4000- Trm gc Wimax theo chun 802.16-2004

- c im k thut dch v d liu

- Giao din ngi dng

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Cng vt l RJ-45 100Base-T cho mi Sector Wimax

Giao thc giao din lpmng

IEEE 802.3

Phn on mng VLAN IEEE 802.1Q/802.1D (802.1p)

c im lin mng

Giao thc lu lng ngidng

IPv4, PPPoE, L2TP, PPtP, IPSec, MPLS

Chuyn mch gi Chuyn mch lp 2 v chnh schchuyn mch c thi gian tr thp cho php d dng hot ng gia cc router,gateway, firewall/NAT, IP PBX, MediaGateway v DMZ (Demilitarised Zone)vi nhau h tr cc ng dng doanhnghip v nh ring.

Lc gi iu khin trn a hng/ qung b

Phn loi gi (tun theo

chun 802.16 v SR-Telecom)

Lp 2: IEEE 802.3, 802.1Q, VLAN ID,

IEEE 802.1D (802.1p).Lp 3: IP, phn bit im m dch v/TOS

Lp 4: s cng v/ hoc vng

c im QoS

H tr dng dch v Chnh sch p buc cho mi lung dchv

H tr lp a dch v cho mi SS

Profile mc dch v GoS NMS i xng gm cc profile GoS c nh ngha trc cho cc dch vtiu biu, v d nh VoIP cho nh ring

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v doanh nghip.

iu ha lung lu lngmi dch v

nh du mc u tin lu lng

Xp hng lu lng theo lp cho milung.

B m gi theo ng lu lng

Trng thi lu lng

iu khin tc nghn (WRED)

Lp danh mc lin kt 802.16 (UGS, rtPS,nrtPS, BE)

iu khin s bin ng tp v thi giantr

c im qun l

Cu hnh v qun l SNMP v2/v3, Telnet, DHCP & TFTP

Cu hnh IP cho BSWimax

ng (s dng DHCP) hoc tnh

Bo dng bng phnmm Nng cp phn mm ngang qua giao dinv tuyn ti SS.

T ng nng cp khi ang bt ngun

Qun l SS C tnh i xng: NMS, SNMP hocTelnet.

MIBs Theo chun

Tng cng thm cc c im ty chn.

H tr cc my phn tch/o kim

Thit b o kim c Wimax cp giychng nhn.

Thng lng BS

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Thng lng ti a nguplink & downlink (dunglng nh ca Sector)

6.5Mbps cho tn s 1.75MHz (64 QAM3/4)

13 Mbps cho tn s 3.5 MHz (64 QAM3/4)

c im RF

Phng php truy cp vtuyn

FDD, OFDM

Wimax profiles Tn s 1.75 & 3.5 MHz trong cc bng 3.5GHz

Vng tn s hat ng

li AntenCng sut pht RF

3300 MHz 3800 MHz

17.5 dB (tiu biu)31 dBm

nhy my thu knh iu ch v m ha nhy

1.75 MHz BPSK 1/2

QPSK 1/2

QPSK 3/4

16 QAM 1/216 QAM 3/4

64 QAM 2/3

64 QAM 3/4

-100 dBm

-98 dBm

-96 dBm

-93 dBm-90 dBm

-85 dBm

-83 dBm

3.5 MHz BPSK 1/2

QPSK 1/2

QPSK 3/4

16 QAM 1/2

16 QAM 3/4

64 QAM 2/3

64 QAM 3/4

-97 dBm

-95 dBm

-93 dBm

-90 dBm

-87 dBm

-82 dBm

-80 dBm

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Space-time coding (STC).

Sub-channelisation of 2, 4, 8 v 16 knh.

B sai s trc (FEC)

3.3 Gii php sn phm ca Alvarion.

L nh sn xut hng u cc thit b truy nhp bng rng vi hn 2 triu sn phmc lp t trn 130 quc gia, cc thit b ca Alavrion l gii php c c nh lndi ng bao trm tn s t 450 MHz n 28 GHz. L i tc bn hng ca Intel,Cc chip ca Intel c a vo cc dng sn phm BreezeMax t thng 4-2005.

Vi Wimax tn thng mi sn phm l Breezemax. Cng ngh OFDM.vi nhy cao, cc sn phm ca Breezemax c th p ng tt k c trong iu kin NLOS . Cng sut ph sng ln, anten thng minh a dng, BreezeMax c th cdng trong nh cho c vng ng dn c (thnh th) ln vng tha dn (nng thn).

BreezeMax h tr tt nhiu dch v bng rng nh: truy nhp Internet, VPN, thoi E1/T1, Video v multimedia khc.

BreezeMax l sn phm c trm gc ln thit b u cui.

Vi thit b trm gc: cc c tnh:

- Kh nng cao, Thit k d.

- OFDM, OFDMA, cng ngh anten thng minh.

- Gi thnh khng cao.

- Sn sng cho Wimax.- Ph sng trn 30 Km.

- iu ch : BPSK,QPSK, QAM 16, v QAM64.

- C kh nng tng n 72Mbps cho mt Sector v 432 Mbps cho mttrm gc..

c tnh k thut:

H thng tun theo cc tiu chun:

- Giao din: IEEE 802.16-2004 s nng cp ln 802.16e.

- Data: IEEE 802.3CSMA/CD.

- V tuyn: ETSI EN 301 021V 1.4.1 753 V1.1.1

- EMC: ETSI EN 301 489-1

- An ton: EN 60950 (CE)

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- Mi trng: ETS 300 319 part 2-1 T 1.2 v part T 2-2 2.3 cho trong vngoi tri

Part 2-3 T 3.2 cho trong nh v part 2-4 T4.1 cho ngoi tri.

- Nhit : 0-40 C cho trong nh

-40 n 55 C cho ngoi tri

- m : 5-95 %.

Trm gc: Radio v modem:- Bng tn: 1.5GHz; 2.3 GHZ WCS; 2.5GHZ BRS; 3.3-3.8GHz; 5GHz.

- PHY : OFDM 256 FFT vi uplink OFDMA tng lai h tr

SOFDMA cho Wimax di ng.

- Duplex mode: FDD/TDD.- H tr iu ch: 64 QAM to BPSK (8 mc tng ng)

- rng bng tn knh: 1.75 MHz, 3.5MHz, 5MHZ, 7MHz, 10MHz.

- rng bng tn sng mang: 14 MHz (vi mux IF)

- Cng sut ra ln nht: 34 DBm

- Loi Antena: Omni 60, 90, 120

- Giao din mng: 10/100/1000 Base T, E1/T1

- H tr VLAN: IEEE 802.1Q

- Phn loi lu lng: Lp 2 IEEE 802 1p, IP DSCP

c tnh ca thit b u cui:

- Tch hp giao din bng rng khng dy ca Intel

- D lp t cho vng mi ph sng

- Tch hp SIM card thng minh- Giao din thoi, data, wifi v E1/T1

- Hon tan p dng cho NLOS trong nh

- Nhiu gii php cho Anten

- DRAP (dinamic resource allocation protocol) cho cht lng dch vthoi.

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- 10 Mbps cho CPE

- Qun l SNMP.

c tnh k thut:

- Bng tn: 1.5GHz; 2.3 GHZ WCS; 2.5GHZ BRS; 3.3-3.8GHz; 5GHz.

- PHY : OFDM 256 FFT vi uplink OFDMA

- Duplex mod: FDD/TDD.

- H tr iu ch: 64 QAM to BPSK (8 mc tng ng)

- rng bng tn knh: 1.75 MHz, 3.5MHz, 5MHZ, 7MHz, 10MHz.

- Cng sut ra ln nht: 20-24 DBm (ti cng antena)

- Loi Antena: 18 Dbi (tch hp), 12 Dbi (gn ngoi ), 9 Dbi loi 6 chnt nh hng.

- Phn cc Antena: Ngang v dc.- Phn loi lu lng: Lp 2 IEEE 802 1p, IP DSCP

Data v ni mng:

- Giao din mng : 10/100 Base-T, 802 11g, RJ 11POTS, E1/T1

Alvarion, nh cung cp gii php bng rng khng dy v mng di ng chuyndng, ang tp trung vo cng ngh 4Motion mi. l WiMax di ng tng th

da theo chun 802.16e-2005 ang c trin khai cng vi cc nh cung cp cngngh mng li v IP, thit b u cui v dch v tch hp. Alvarion ang tp trungvo vic cp di tn linh hot cho nhiu dch v. Nh vy cc thu bao di ng sc ng dng 3 loi hnh dch v (truyn thoi, s liu v hnh nh di ng) mlc mi ni.

BreezeMAX l sn phm theo chun WiMax ca Alvarion c thit k h tr chocc ng dng bng rng khng dy c nh, c ng, cm tay v di ng. Phin bn4Motion ng dng cho thng mi bao gm cc chun tng thch vi cc trm gc

BreezeMAX v cc h thng khc nhau ca Alvarion v ca bn th 3 cng nh ccthit b thu bao ca khch hng. Cc th nghim cho phin bn 4Motion d kin stin hnh vo 6 thng u nm 2007.

3.4 Gii php sn phm ca Motorola cho ISP:

Motorola l nh sn xut ln cc thit b u cui v thit b mng v cung cp ccgii php mm do cho cc khch hng c nhu cu khc nhau . T nm 2002 hng pht trin dng sn phm Canopy cng ngh Wimax v c trin khai lp t

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trn mt s quc gia trn th gii. Dng sn phm ny h tr truy nhp khng d bng rng tn s 3.5 GHz lc u, v sau h tr thm cc tn s 2.3 GHz, 2.5 GHzv 5GHz khng cp php. Lot sn phm ny cn bao gm c cc CPE ngoi tri(gn tng hoc mi nh) cng nh cc sn phm trong nh (dng bn) modemCPE v Wifi gateway. Cc trm gc wimax (WBS) ca Motorola c khang cchrt mm do v linh hot ph hp cho trin khai cc t bo. iu ny cho php cc

nh cung cp c th cung cp cc dch v bng rng khng dy di ng trn phmvi rng ln.

u th ca cc sn phm Canopy:

a. D dng trin khai: H thng sn phm Canopy vi cc giao thcthng minh, d trin khai v vn hnh. Vic thit k mng trn c s han thin mng c sn nn cng n gin vic lp t. Khng phitrin khai ng dy v h thng vi ba mi. Vic lp t c th chtrong vi ngy thay v hng thng cho mi trm.

b. Cu hnh linh hot : Vi cu hnh im a im c ly lin lc c thln n 24 km, cu hnh im im c ly lin lc c th ln n200km. Ngoi ra h thng cn c tch hp cc giao din cho phpqun l mng, tnh cc v gim st t xa.

c. Trin khai vi u th vt tri nh h thng c Mun ha cao,trnh c nhiu, nhiu ph tn chn la nn c th ph hp cho cvng ng dn ln vng nng thn tha dn c.

d. Vic bo mt ca h thng cng tun th theo m ha DES ( Dataencryption standard) v tng thch vi AES (advanced encryptionstandard ) tc l c m ha 128 bit bo m an tan vic pht vnhn tn hiu.

e. Tc truyn cao: Vi cu hnh im - a im tc l t 512Kbps n 14 Mbps v vi cu hnh im im th tc l t 10Mbps n 300 Mbps. Tt nhin tc ti ln v xung trn thc t tng ni c th cn ph thuc cc yu t khc nhau nn c th khcnhau.

3.5 Gii php Chipset ca Fujitsu.

3.5.1 M tFujitsu pht trin cc ng dng truy cp v tuyn bng rng rt hiu qu v chi phtch hp MAC v PHY vo trong b x l tn hiu bng gc. Thit k SoC ny htr mt vng tn s t 2-11 GHz trong c bng cp php v cha cp php.

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N h tr tt c cc rng di tn c sn hin nay t 1.75 MHz n 20 MHzFujitsu Wimax SoC tun theo b tiu chun IEEE 802.16-2004 v Wimax v c thcu hnh s dng c c hai ng dng trm thu bao v trm gc.

SoC h tr cc k thut iu ch thch ng hiu qu cao gm 64 QAM, 16 QAMQPSK v BPSK. Tc d liu SoC ti a l 75 Mbps khi p dng k thut iuch 64 QAM trong knh 20MHz v s dng tt c 192 sng mang ph. Cc knh ph ng ln cng tun theo yu cu ca b tiu chun. Cc tnh nng tng cngvi hai b x l RISC cng c nhng vo SoC.

Hai b x l ny bt tay vi cc chc nng ch yu theo yu cu ca c tnhWimax v cn cho php bt tay vi phn mm ng dng ca ngi dng.

3.5.2 Tnh nng:- Hon ton tun th b tiu chun IEEE 802.16-2004.

- H tr c hai trm gc v trm thu bao cho cc ng dng TDD hoc FDD.

- Tch hp 256 OFDM PHY vi cc k thut iu bin 64QAM, 16QAM,QPSK v BPSK.

- Phn chia ng Uplink theo cc knh ph

- Giao din bng gc linh hat vi cc b chuyn i tc cao ADC, DAC.

- Tnh nng iu khin tn s t ng (AFC) tch hp vi b chuyn i DAC

- Tnh nng la chn tn s ng (DFS) tch hp vi b chuyn i ADC.

- B chuyn i ADC tch hp o cng sut thu/ pht.

- Bo mt s dng cc k thut m ha/ gii m DES, AES, CCM.

- Hai b x l RISC hat ng vi cc lp bn trn v bn di lp MAC.

- Tch hp b iu khin b nh v b iu khin DMA.

- Tch hp k thut Ethernet cho giao din mng.

- C nhiu b thit b ngai vi tch hp v iu khin tn hiu RF.

- AGC c th lp trnh h tr vng rng s suy gim tn hiu RF.

3.5.3 ng dng:H thng BWA tun theo cc c tnh Wimax c nh:

- Trm thu bao gi r

- Cc CPE doanh nghip

- Cc trm gc

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- Theo hp ng, in thoi ca Motorola s s dng chip ca Intel. Ngoi ra,hng cn d nh s tip tc hp tc vi cc cng ty sn xut chip khc. Motorolahy vng WiMax s ng vai tr chnh trong chin lc pht trin di ng cahng. Nh sn xut in thoi ny c kt hoch s trnh lng in thoi di ng sdng cng ngh WiMax 802.16e vo u nm 2007.

Intel d nh s xut xng chip WiMax dnh cho laptop trong vng 1 hoc 2nm ti.Cc bang( M), thnh ph, vng, trn th gii c Intel h tr tr thnh np dng cng ngh thng tin s han tan (c s dng cng ngh Wimax) trn thgii l : Cleveland, Ohio; Corpus Christi, Texas; Philadelphia,Pennsylvania; vPortland, Ore. M , cng Mangaratiba, Brazil; Dusseldorf, c ; Gyor,Hungary; Jerusalem, Israel; Principality ca Monaco; Seoul, Hn quc ; Osaka, Nht bn ; Taipei, i loan ; v Westminster, Nc Anh .

Theo m hnh sau:

Ngy 17/10/2005 i Loan v Intel k bn ghi nh (MOU) v vic trin khai thnghim cng ngh bng thng rng khng dy Wimax ti mt s vng ca iLoan.B H M Nguyt, B trng B Kinh t i Loan cho bit, t nm 2005 n nm2008, i Loan s u t khong 37 t i t (khong 1,2 t USD) cho d n M-Taiwan (i Loan di ng), trong cng ngh Wimax l mt hng mc bao gm.B Kinh t i Loan s ch tr d n ny.

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ng Sean Maloney, Ph Ch tch tp on Intel cng khng nh, Intel s h tr i Loan ton b v mt cng ngh v kinh nghim, gip i Loan trin khai thnhcng Wimax, tr thnh mt ni s dng cng ngh Wimax ph bin v ln nht thgii.

L k kt MOU din ra ng thi vi s kin Din n cc nh pht trin Intel IDF Fall 2005, c s chng kin ca ng o cc phng tin truyn thng quct.* Ngy 22/9/2005, Intel tuyn b v mt chng trnh trin khai Wimax cho ccnc ng Nam nh: Thi Lan, Malaysia (cui nm 2005); Vit nam, Indonesia(2006). Theo ng, chng trnh s mang li li ch thc tin g cho cc nc nykhi m hin ti, a s dn chng cn cha kh nng kinh t cng nh trnh dn tr khai thc ht tim nng ca cc cng ngh hin i nh my tnh xch tayv mng Internet tc bnh thng?

ng Sean Maloney, Ph ch tch tp on Intel ni: Hin nay, Intel ang lm vicvi cc chnh ph, cc nh cung cp dch v vin thng, cc b ngnh Gio dc, yt, nng nghip... ca nhng nc ny cng nh ca Vit Nam, chun b chovic trin khai th nghim cng ngh WiMAX, hy vng s bt u vo nm 2006Sau khi th nghim xong, chng ti s nghim thu v m rng trin khai WiMAXChng ti hy vng vi cc bc chun b ny s em n nhng thnh cng nhtnh trong cng cuc ng dng s ho, c bit c ngha i vi cc nc ang pht trin trong khi ASEAN.

Nhng bc khi u v bng thng rng khng dy s to mt nn mng vngchc cho "tm nhn ng Nam s" (The Digital ASEAN vision) v thc t ncng lm tng t l s dng my tnh v Internet ti cc nc ny. Chnh iu skhin bng thng rng khng dy tr nn ph bin, d tip cn v tn t chi ph hvi cng ng.

Chng trnh Tm nhn ng Nam s ca Intel l nhm gip cc lng, x, thtrn, tnh, thnh, quc gia ti khu vc NA kt ni Internet, to ra mt khu vclin kt mnh, nhm cnh tranh tt hn vi cc quc gia pht trin lng ging nhTrung Quc v n .

Alcatel trin khai mng khng dy bng rng ti HylpNgy 02/9/2003 Alcatel cng b trin khai thnh cng c sh tng mng truy nhp khng dy da trn h thng phnphi a im ni ht LMDS cho STET Hellas, Nh cung cpdch v di ng hng u Hylp.

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Gii php LMDS ca Alcatel to cho STET Hellas mt c s htng l tng h tr mng backhaul cho 2G, 2.5G v 3G cngnh mng truy nhp khng dy bng rng v cc yu cu truyndn ca mng a dch v.Alcatel trin khai trm gc, thit b u cui khch hng vkhi tp chung a dch v (MSC-Multiservice Concentrator)7270 trn nn a dch v 7470 (MSP-Multiservice Platfrom) c ca mng STET Hellas. S kt hp 7270 MSC v 7470 MSP cth h tr a dch v bao gm chuyn tip khung, Ethernet,ATM v IP. Ngoi ra Alcatel nng cp phn mm qun lmng 5620 gim st v qun l c mng mi.Mng truy nhp khng dy bng rng mi trin khai ny ca vo khai thc ti cc thnh ph ln Hylp nh Athens,

Thessalonili. Vi gii php LMDS im-a im ca Alcatel,STET Hellas c th trin khai cc dch v bng rng khng dycht lng cao ti cc i tng s dng u cui cng nh ti u clu lng bng rng trn c s h tng di ng ca mnh. imquan trng na l vi cu hnh ny STET Hellas tit kim -

c ng k chi ph cho vic trin khai cc dch v bng rngkhng dy.Tp on China Unicom ti Trung Quc chn h thng

AirStar ca hng NetroNgy 11/8/2003 China Unicom, Nh khai thc vin thng tnghp duy nht ti Trung Quc, la chn AirStar, h thng truynhp khng dy bng rng c nh ca hng Netro trinkhai mng truy nhp cht lng cao ti Bc Kinh, Thng Hi v 5thnh ph min ng Trung Quc. China Unicom s m rng ccmng trc hin c cung cp dch v thoi, s liu v hingh truyn hnh.H thng AirStar p ng c cc yu cu ca China Unicomv mt gii php a nng vi cht lng cao, n c th tch hpmt cch khng c ranh gii vo mng trc hin c. Vi h thngny China Unicom c th cung cp cc dch v chuyn tipkhung, TDM, IP v ATM.

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AirStar hot ng ti bng tn 26 GHz ti ba thnh ph v 3,5GHz ti nm thnh ph. C hai bng tn ny cng c s dng tiBc Kinh. S mm do trong vic s dng tn s, duy nht c AirStar, cho php China Unicom qun l v phn phi dch vc hiu qu trong vng ph sng.AirStar l mt h thng truy nhp khng dy bng rng cnh c th trin khai nhanh, cung cp mt di rng cc dchv thng tin cho cc khch hng thng mi, ng thi n c thtrin khai ng vai tr lm mng backhaul. AirStar c th hotng ti cc bng tn 3,5 ; 10 ; 26 ; 28 v 39 GHz.Cng ho Czech la chn h thng Angle ca hngNetroNgy 08/9/2003 Czech Radio chn h thng truy nhp khng

dy bng rng NLOS Angel ca hng Netro xy dng c shng tng khng dy ni ht cung cp cc dch v thoi v sliu trn 26 thnh ph chnh ca Cng ho Czech. Vic trinkhai ng lot ny l kt qu th nghim thnh cng ca Angelti thnh ph Pilsen.Czech Radio s dng h thng truy nhp Angel khcphc vn tht nt c chai chng cui, y l vn mu cht cung cp dch v s liu bng rng cho cc thubao thng cng nh thu bao thng mi.

Trm gc Angel kt ni vi cc thit b pha khch hng quagiao din khng gian ng thi giao tip vi mng PSTN vmng dch v s liu DSN. Cc thu bao c th truy nhp vomng bng rng mt cch trong sut thng qua i dy inthoi c trong nh hoc kt ni Ethernet t my tnh. Mimt thit b pha khch hng CPE ca Angel c ti 6 ng thoing thi v kt ni bng rng cho cc khch hng thng mi;2 ng thoi v kt ni bng rng cho cc thu bao thng.Indonesia la chn h thng AirStar ca hng NetroPT Aplikanusa Lintasarta, Nh cung cp dch v mng ln nht tiIndonesia chn h thng AirStar 10,5 GHz cho cc d n ticc min Kalimantan, Java v Sulawesi ca Indonesia. Vi hthng AirStar, Lintasarta c kh nng cung cp cc dch v ATM,

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chuyn tip khung v knh ring cho cc khch hng trong vngph sng ca n.Lintasarta s m rng mng hin c ca mnh vi 15 trm AirStarti Jakarta, Bandung v Surabaya. Trong t u, trin khai 8trm AirStar v khong 100 thit b pha khch hng CPE.

5. HIN TRNG MNG TRUY NHP BNG RNG CA VNTi Vit nam mng truy nhp bng rng mi l cng ngh 2.5 G ca 2 mngVinafone v Mobifone , cui nm 2005 l khong 1000 im truy cp Wifi caVDC trin khai trn ton quc nh cc khu cng nghip, ta nh cao tng, trngi hc, sn vn ng, nh ga. v mi y l th nghim cng ngh EV-DO caS-phone cho mng di ng cng ngh CDMA ( s c ph sng tan quc trongnm nay) m sp ti y Hanoitelecom v E-Mobile s trin khai cong ngh ny .

Tuy nhin c th thy nhu cu truy cp bng rng ca Vit nam l rt ln.

Nm 2004 tan quc mi c 50.000 thu bao ADSL th n cui nm 2005 cons ny tng thnh 200.000 (tng 300%). Hin nay ti mt s ni cung khng cu vi dch v ADSL ny. Trong thi gian ti khi gi thnh h xung nhu cu lpt s tng nhy vt nh thi gian qua.

Tng t nh vy s thu bao di ng cng bng n. S thu bao di ng cnc nm 2004 l khang 4.5 triu v nm 2005 l khong 9 triu . D bo s thu bao di ng ca VNPT cui nm 2006 s l 10 triu v n nm 2010 s thu bao ddng c nc s tng gp 3 ln hin nay (khong 40 triu ) . Vi s lng ln thu bao di ng khi c tch hp chip Wimax cng vng ph sng Wimax lan rng, gi cc dch v vin thng cng gim theo xu hng hi nhp, m cagia nhp WTO, nn kinh t tng trng cng nhu cu thng tin a dng th ta cngthy tng lai ca cng ngh Wimax l rt sng sa ti Vit Nam.

* Ngy 26/7/2005 , B Bu chnh Vin thng phi hp vi Cng ty EtherLinx(M) ng t chc bui gii thiu k thut v cc gii php v ng dng mng bng rng khng dy (wireless broadband).

Cng ty EtherLinx gii thiu nhng vn c gii vin thng quan tm:Truy cp Internet tc cao khng dy; Qu trnh pht trin mng khng dygiai on lu di; S hi t ca hai mng khng dy: mng li chuyn mch vmng ng gi chun 4G; Tiu chun ca nh truyn thng v truy cp khngdy...

EtherLinx cng chia s nhng kinh nghim, cc ng dng v an ton v bo mt dnh cho cc phng tin di ng ca Chnh ph, B Quc phng, hthng iu hnh cho ngnh gio dc, tm cc c hi kinh doanh i vi mng

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VNPT - Tng cng ty Bu chnh Vin thng Vit Nam ang trin khai th nghimcng ngh Wimax ti H Ni, Nng, TP.HCM, Lo Cai v Bc Ninh. Theo khoch, vic cung cp th nghim s din ra trong vng 1 nm i vi cc thit bc nh.

L doanh nghip ch lc thuc VNPT trc tip th nghim dch v ny, hin,Cng ty in ton v Truyn s liu VDC ang hp tc vi cng ty Intel kho stmt bng v lp t thit b ti Lo Cai. Khong hai thng na, s bt u cungcp th nghim dch v ny.

VDC s c k hoch lin kt vi hai nh cung cp dch v in thoi di ng VMSv GPC (ch qun hai mng MobiFone v VinaPhone) c th cung cp dch vWimax din rng. Mc ch hp tc nhm tn dng c ct pht sng BTS snc hoc cc thit b pht sng ca di ng; gim thiu c chi ph vt t v lpt.

Hin ti, mt s cng ty nm bt c nhu cu ca Vit Nam v trin khai cngngh WIMAX, do mt s cng ty c cc bui hi tho gii thiu sn phm:Alvarion :

Alvarion c cc dng sn phm chnh:

- H BreezeMax bao gm cc sn phm chnh : BreezeMaxPro vi cc c tnh k thut nh sau: di tn s dng t3499.5-3600 Mhz, 3399.5Mhz-3500Mhz, phng thc truynhp v tuyn TDMA FDD, bng tn cho mt knh

1.75Mhz, 3,5 Mhz. BreezeMax 3500 vi cc c tnh kthut nh sau: di tn s dng i vi trm gc t 3399.5-3453.5Mhz, 3499.5-3553.5 Mhz, 3450-3500Mhz, 3550-3600Mhz, di tn i vi thit b u cui 3399.5-3500Mhz, 3499.5-3600Mhz, phng thc truy nhp vtuyn TDMA FDD, bng tn cho mt knh l 1.75Mhz, 3,5Mhz.

- H BreezeACCESS bao gm cc sn phm chnh:

BreezeACCESS II dnh cho bng tn khng giy php.BreezeACCESS XL dnh ring cho khai thc ti cc bngtn c giy php trn ton th gii l bng tn 3,5 GHz;3,8 GHz v 26 GHz ti chu u. BreezeACCESS MMDSdnh cho bng tn c php ti M, M Latinh v Chu

Redline Communications:

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Redline Communications c c thit b trm gc v thit b u cui vi mt sc tnh k thut chnh nh sau:

- RedMAX Base Station : y l thit b trm gc. Thit bny c din n Wimax cp chng nhn vo ngy17 thng 1 nm 2006. RedMAX Base Station hot ng tidi tn 3.5 Ghz, vi rng knh 3.5 Mhz vi phng thctruy nhp l TDD.

- RedMAX Subscriber Station : y l thit b u cui. Thit b ny c din n Wimax cp chng nhnvo ngy 30 thng 1 nm 2006. RedMAX Base Stationhot ng ti di tn 3.5 Ghz, 3.6 Ghz, vi rng knh3.5 Mhz vi phng thc truy nhp l TDD.

Siemens:

Gigaset SE461 WiMAX:c dng cho u cui pha thu bao (CPE) vi cc c im kthut:

- Di tn hot ng, GHz: 3.5 GHz

- rng knh: 1,75/3.5/7.0 Mh

- Truy nhp: TDD/H-FDD

Thit b ny hot ng da trn chun 802.16d v c din n

WimaxForum cp chng nhn vo ngy 17 thng 3 nm 2006.WayMAX@vantage

y l thit b c s dng cho trm gc, c din nWimax cp chng nhn vo ngy 17 thng 3 nm 2006. Thit bny hot ng ti di tn 3.5 Ghz, vi rng knh 3.5 Mhz viphng thc truy nhp l FDD.

Motorola

Hng Motorola cng gii thiu sn phm trm gc v trm u cui cho cngngh Wimax. Motorola gii thiu mt h thng DEMO vi tn gi l MOTOwi4tm s dng trn di bng tn 3.5 GHz da trn cng ngh 802.16e. y l chunwimax h tr cho cc thit b u cui c kh nng di ng c.

Trin khai th nghim cng ngh WIMAX ti Lao Cai:

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Hin ti, Intel, Cng ty in ton v truyn s liu (VDC) cng C quan hp tc pht trin quc t Hoa K ti Vit Nam (USAID) s hp tc vi nhau trong d nth nghim v trin khai cng ngh Wimax ti tnh Lao Cai v cng ngh bng rngkhng dy c nh c s dng l Fixed WiMax 802.16 - 2004 Rev.d vi tn s3,3 GHz - 3,4 GHz. Khon 20 a im ti Lo Cai c la chn tham gia thnghim gm cc trng hc, mt s c s y t, im bu in vn ho x, y bax, doanh nghip va v nh v mt gia nh nng dn cha tng tip xc vi cng

ngh hin i. Cc dch v c a vo th nghim l thoi v Internet tc cao6. M HNH TRIN KHAI CNG NGH MNG WIMAXng dng cng ngh WiMAX c th phn vo hai dng chnh: Khch hng truy cptheo hnh thc c nhn, xy dng h thng truyn dn ring v khch hng ngdng WiMAX cung cp mng truy cp cng cng

6.1 Mng dng ring

- Cellular backhaul : ph sng m rng cho kiu cu trc t bo.

Trong mi trng ngy cng cnh tranh cc dch v wireless cu trccellular, mt nh kinh doanh truy cp thng tin lin tc vi mong munthng tin nhanh, nhng gim thiu chi ph bng vic la chn cc gi cc ph hp. WiMAX s cung cp cho bn ng truyn im im vikhong cch ln n 50 km, tc d liu h tr ln n E1, T1, thit bWiMAX xy dng nn h tng mnh ti trm gc t m rng ra cccellular xa.

Hnh 9 Cellular Backhaul

- Wireless Service Provider (WSP) Backhaul :

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Cc nh cung cp dch v v tuyn (WSP) s dng thit b WiMAX xydng mt h tng lu thoi t trm gc

Hnh 10WSP Backhaul

So vi cc mng truy nhp khng dy c trin khai trc y thWiMAX c nhng u im: trin khai nhanh

- Mng ngn hng:

Cc ngn hng trung tm c th kt ni n cc chi nhnh ca mnh thngqua mng WiMAX c nhn chuyn ti thoi, data v video. Thng thngcc ngn hng thng nm phn b trong cc khu vc rng, nhng li cn

bng thng ln v an ninh cao

Hnh 11 Mng ngn hng

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Cc ban ph trch trng hc dng mng WiMAX kt ni cc trng vcc vn phng ban trong cng mt khu vc qun, huyn. Chng hn vi yucu bng thng cao (>15Mbps), kh nng thng tin im-im hoc im-aim vi mt vng ph sng tri rng cung cp cc dch v nh: in thoi,data (s liu v sinh vin), email, internet, o to t xa gia vn phng ban ph trch trng vi cc trng trong qun hay gia cc trng vi nhau.

Trong mi trng gio dc , mt camera trng B c trh truyn tnhiu t lp hc (thi gian thc) n trng A

Hnh 12 Mng gio dc

Vng ph sng rng, chi ph hp l, c bit hiu qu i vi cc trng nng thnni c h tng c s truyn dn km, ni m cc gii php ko cplun i hi mc chi ph cao.

- An ton cho cc truy nhp cng cng (Public Safety):

Bo v cc c quan chnh ph nh: cng an, cha chy, cu h. C th dngmng WiMAX h tr trong cc tnh hung tr gip khn cp, cung cp

chc nng thai 2 chiu gia trung tm v cc i ng cu.. Cht lngdch v ny cng cho php thay i lu thai theo nhng yu cu khc nhau.Gii php WiMAX l ph sng su rng iu gip cho cc i cu h tini xy ra tai nn, cc s kin, s vic hay cc thm ha thin nhin c thci t mt mng tm thi trong mt vi pht gi tn hiu v trung tm.H cng c th ch ng c lng lng khi gi tn hiu v trung tmthng qua mng WiMAX hin hu, l mt trong s ng dng tha hngt WiMAX.

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Hnh 13 M hnh an ton cho cc truy nhp cng cng

i vi mc tiu di ng cng vy, chng hn nh mt ngi cnh st c th truy

cp d liu trn mt chic xe ang chy, mt ngi lnh cha chy c th truy cpthng tin v ng i ngn nht n ni xy ra ha han. Mt camera trn xe cuha c th a hnh nh v tnh trng ca bnh nhn ch ng cp cu trc khxe a bnh nhn v n bnh vin. Trong tt c cc ng dng nu trn c ngdng WiMAX trn bng thng rng, trong khi i vi h thng bng thng hpkhng th p ng c.

- Thng tin lin lc xa b:

WiMAX c th ng dng trong cc cng ty du kh trong thng tin lin lc

gia t lin v gin khoan

Hnh 14 S dng Wimax cho vic thng tin lin lc xa b

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Trong cc hot ng thao tc thit b, i din vi cc vn phc tp, cc cngvic i hi mc gim st cao v cn truy xut d liu nng. Cc tn hiu nyc th gi v trm t lin cc b phn chuyn mn kp thi phn tch s lCng vic khai thc du kh cn m bo yu t an ton, trc cnh bo, gim st bng camera, bn cnh truyn ti c cc thng tin c bn nh: thoi, internetemail , hi ngh truyn hnh.

WiMAX trin khai lp t nhanh chng, cn thit iu chuyn n ni mi cng ddng, c th khng cn ngi trc thit b, thit b t hot ng bng ch trang bthm pin nng lng.

- Kt ni nhiu khu vc(Campus Connectivity)

Hnh 15 Kt ni nhiu khu vc- Cc cng trnh xy dng (mang tnh tm thi):

Cc cng ty xy dng c th dng mng WiMAX thit lp ng lin lcn vn phng trung tm ti cng trng ni ang xy dng ti ni ch huyti ch: ngi qun c, cc k s, kin trc s

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Hnh 16Cc cng trnh xy dng

Trong trng hp ny ng dng WiMAX da trn u im trin khai nhanh,iu ny quan trng i vi cc cng trnh ang thi cng v n cho php cungcp nhanh thng tin v cng trng bao gm c thai ln d liu, cung cpc dch v theo di qua hnh nh ti nhng im nng trong iu kin gimst kh khn. Cng c th ci t mt im hotspot ti cng trng cho phpmt c nhn c th thng tin lin lc, trao i d liu, thng tin v cc tintrnh cng vic ang din ra.

Ging nh trong cc trng hp ng dng khc nu i hi v cht lngdch v th WiMAX c xem xt u tin. V thit b WiMAX nh gn,tho lp t d dng, iu chuyn n cc ni khc nhau theo yu yu cucng vic xy dng tin li.

- Cc khu vc cng cng (Theme Parks):

Phn chia mt phm vi rng cc dch v thng tin cho cc khu vui chi giitr, cc hat ng ngoi tri, cc hot ng giao dch, trn xe but v ccdch v vn ti khc

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Hnh 17Cc khu vc cng cng

Mng trn c th h tr lu thoi bng thng rng hai chiu gi t mt trungtm iu khin, hnh nh gim st bao qut ton cng vin, kim sot d liu

truy cp, gim st tnh trng ti ch, video theo yu cu, giao tip in thoi phc v va c nh va di ng, bo mt cao, suy hao thp, vng ph sngrng, vic di chuyn lp t d dng ng bin vi cc thay i xy ra l ms u tin la chn thit b WiMAX

6.2 Cc mng phc v cng ng:

i vi mng cng cng, ti nguyn c xem l ca chung, nhiu ngi scng truy xut v chia s. xy dng mt mng cng cng ni chung yu cumt chi ph hiu qu, m cung cp c vng ph sng ln v ngi s

dng c th nhiu vi tr khc nhau c th c nh hoc thay i. Nhngp ng chnh ca cc mng cng cng l thoi v d liu, truyn hnh nhtrc tuyn. ng thi an ninh mng cng l mt yu cu quan trng, mc phc tp cao v c nhiu ngi i tng s dng, mt s ng dngWiMAX mi trng trong mng cng cng nh sau

- Mng truy nhp WSP:

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Hnh 19Trin khai vng nng thn xa xi ho lnh

Trin khai cng ngh WiMAX vo cc vng nng thn, cc ni tp trung dnc hay cc khu vc ngoi thnh ph. Vic kt ni n nhng vng nng thnxa xi cng l mt trong nhng mc tiu trng im pht trin x hi ca mtquc gia trong vic phc v nhng nhu cu thit yu nh thoi v internet, v nhng ni c s h tng gn nh khng c v vn ko cp l hon tonkhng kh thi, gii php WiMAX cp n v kh nng ph sng rng, titkim.

Documents

Tong Quan Ve Cong Nghe Wimax, Tinh Hinh Trien Khai Tren the Gioi Va Cac Mo Hinh Ung Dung