BQ MAO DIJC VA DAO TAO
TRUUNG DAI HQC THANG LONG
—o0o--
1
THANG LONG
UNIVERSITY
CHUYEN DE TOT NGHIEP
NGHIEN CITU CHAT LONG DICH vu
TRONG WIMAX
Gila vien hurting chin
Sinh viers thyc hi§n
MA sink vien
Chuyen nginh
:ThS. Holing Tryng Minh
:Phan Tien TAng
:A13162
:Tin vien thong
HA NQI - 2013
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MVC LVC
1
"Ma NO1 MU
CHUCING 1: TONG QUAN
THONG W1MAX
2
1.1. WiMAX 111 gl?
2
1.2. Cac chnin cal WIMAX
5
1.2.1. Chan IEEE 802.16-2001
5
1.2.2. Chuin IEEE 802.16a.
5
1.2.3. Chain !PPP 802.16-2004
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1.2.4. Chuhn IEEE 802.16e.
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1.3. Phil WiMAX.
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1.3.1. Bang tiln dang
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1.3.2. Bang tin khong (tang k9 5GHz
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1.3.3. Clic bang tin duqc d8 nu& cho WiMAX tren the gitri.
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1.3.4. Citc bang tin Is Viet Nam co khe Ming dinh cho WiMAX.
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1.4. Truyin sang
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1.4.1. Dieu the thich nghi
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1.4.2. CEng nghe sou l&
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1.4.3. Dilu khien Ong suit.
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1.4.4. Cac c8ng nghe v8 My& tien den
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1.5. So sinh WiMAX vai WiFi vi 3G
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1.5.1. WiFi
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1.5.2. 3G
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1.6. KM kiln chirang
CHVONG 2: CAC Ki THUAT SLY DUNG TRONG WiMAX
2.1. Ky thu$t OFDM
16
17
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2.1.1. Su inh huong cua mai trubng den viec truyen dAn
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2.1.2. Da song mang (Multicarrier)
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2.13. CEng nghe OFDM yeti kha Wing km the nhieu
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2.1.4. Tao vet thu OFDM
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2.1.5. Cac set dls Mitt the
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2.1.6. Khoing bio 4 (GUARD PERIOD)
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2.1.7. Tao cac 10 hieu OFDM
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2.1.8. M8 tit k, hieu OFDM
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2.1.9. Ciu trim khung
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2.2. KT thult OFDMA cho mung WIMAX.
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2.2.1. Nguyen 1y co him
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2.2.2. Nhttng Se till vact trOi
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2.2.3. Citc giao dike OFDMA
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2.2.4. au tree 10 hieu OFDMA vi pit kenh con
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2.2.5. CAu frac khung TDD
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2.2.6. T6ng quit A khung (Frame)
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2.2.7. Ckc phin trong khung (Frame Parts)
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2.3. KM lu.n chimng.
CHIJONG 3: GUI PHAP CONG NGH$ WIMAX
3.1. WiMAX c6 djnh - IEEE 802.16d-2004
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34
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3.1.1. Lop MAC
34
3.1.2. Lop PHY
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3.2. WiMAX di Ong - IEEE 802.16e - 2005
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3.2.1. Lop PHY
47
3.2.2. Lop MAC
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3.3. Kit hien chwung
56
CHUONG 4: UNG DVNG CC1NG NGH$ WIMAX
4.1. M8 hinh triton khai WIMAX Oleic yen an tray 4p di Ong
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57
4.1.1. T6 einem tram g6c BS
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4.1.2. Tinh di gang cka ngutti dOng
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4.1.3. Chuin sfr dung
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4.2. M8 hinh triton khai WIMAX veti the yen can tray 4p c6 djnh
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4.2.1. Thitst bj du cutai khich Wing
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4.2.2. Chan stl dung
58
4.3. Tinh hinh *ng dung WiMAX * Vitt Nam
4.3.1. liu diem
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59
59
4.3.2. Thach thirc
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4.3.3. Tinh hinh thvc to
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4.4. Xu hiftng can wimax trong that gian tot trait qui ma thi gi6i
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4.5. Tiim Sing cho wimax 6 Viet Nam
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4.6. Kit lu$n chwung
68
KET LUAN VA BUYING PHAT MIEN DE TAI
70
Kit loan
70
thrimg phIt triin di tel
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TAI LISU TRAM 101i0
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DANH SACH HiNH YE
Hinh 1.1 M8 hinh mpg WiMAX
2
Hinh 1.2 Minh hos host dOng WiMAX
11
With 1.3 Bin kinh cell quan 110 Ai dilu chi thich nghi
11
Hirsh 1.4 MISO.
12
HInh 1.5 MIMO
13
With 2.1 Suy gilun tin hieu theo lchoing cich
17
HInh 2.2 Su tao m tin hieu OFDM
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HInh 2.3 FDM th8ng thubng vi OFDM
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With 2.4 So sinh song mang cia OFDM yeti cic hinh thirc Mg& thong
19
Hirsh 2.5 OFDM phit vi thu
20
Filth 2.6 So d6 lch6i cos thiet bi diu cu6i
21
HInh 2.7 Gin dis IQ cos 16QAM khi dung mit Gray
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Hinh 2.8 Chin lchoing thbi gian &to 4 cho m8i hieu
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Milt 2.9 BO phit OFDM 4 song mang
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Hirsh 2.10 Ctiu frac Tulin thbi gian cial0 hieu OFDM
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filth 2.11 M8 tit tin s6 OFDM
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Hinh 2.12 Ciu true khung 802.16 OFDM
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Mirth 2.13 So slip /cep theo hai chieu trong OFDMA
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Hinh 2.14 Sr so sinh OFDM vi OFDM
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HInh 2.15 Ciu true song mang con OFDMA
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Hirsh 2.16 Kenh con pit gip tin s6 DL
29
Hinh 2.17 au frac tile cho UL PUSC
30
With 2.18 du frac khung OFDMA
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H1nh 3.1 Qui trinh phis loci MAC SDU
34
H1nh 3.2 du tic cila MAC PDU
36
H1nh 3.3 Qui With truyen-nhin
42
Hinh 3.4 Qui Irinh xen ke
44
Hirsh 3.5 du trim khung TDD
46
Hinh 3.6 Ciiu tic khung con dutmg xu6ng TDD
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Hinh 3.7 Chu tnic khung con dubng len TDD
46
Hinh 3.8 OFDM yi OFDMA
48
HInh 3.9 Hieu cmg kenh con hoe (sub channelization)
48
Hinh 3.10 Dieu chi thich nghi vi mi h6a dtra tren khoing each yeti BS
49
Hinh 3.11 Co che
yeu au lap lai khi 16i xiy ra
51
HIM 3.12 H6 trq QoS trong Mobile WiMAX
52
Hinh 4.1 Ng dung da clang ctla Mobile WiMAX
59
Hinh 4.2 Toin anti thung lung Ti Van
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Minh 4.3 Binh Si ye thiet bj tram g6c BS dugs lip On DSc nhl diem BDVHX
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HInh 4.4 HInh inh thrc te thiet hi Out door phis Ichich hAng
65
Hirsh 4.5 Hinh inh nu& din Ti Van troy cep Internet
65
fah 4.6 WiMAX tren taxi
68
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DANH SACH BANG BLEU
Bang 1.1 So sitnh cac chain !PPP 802.16
7
Bang 1.2 So sloth WiMAX di Ong vi 3G.
15
Bang 2.1 MR Gray
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Bang 2.2 Tham s6 vet 1, cua OFDM
27
Bang 3.1 Cie loci khoi bao mot se dung tong IFFF 802.16-2004
42
Bang 3.2 MA sea 16i dbi yeti cac phuang then dieu chi
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Bang 3.3 Kich ce kh6i bit xen ke
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Bang 3.4 Cie phuang thee dieu chi vi MA has dtrqc he trq trong 802.16e
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Bang 3.5 T6c dO de lieu lap PHY Mobile WiMAX
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Bang 3.6 thing hqp ye QoS trong Mobile WiMAX
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THU4T Nab. VIET TAT
AAS
AK
BE
BER
BM
BS
BW
BWA
CDMA
CA
CP
CPE
CPS
CRC
CS
DES
DFS
DFT
DHCP
DL
EC
ECB
EDE
FEC
ETSI
FBSS
FDMA
FDD
FEC
FFT
FSS
FWA
GPS
H-FDD
HHO
IE
MIT
IDFT
IFFT
adaptive antena system
Authorization key
Best effort
Bit error ratio
Base station network interface
Base station
Bandwidth
Broadband wireless access
code division multiple access
Certification authority
Cyclic Prefix
Customer Premise Equipment
Common part sublayer
Cyclic redundancy check
Convergence sublayer
Data encryption standard
Dynamic frequency selection
Discrete Fourier Transform
Dynamic host configuration
protocol
Downlink
Encryption control
Electronic code book
Encrypt-Decrypt-Encrypt
Forward Error Correction
European Telecommunications
Standard Institute
Fast Base Station Switching
Frequency Division Multiple
Access
Frequency division duplex
Forward error correction
Fast Fourier transform
Fixed satellite service
Fixed wireless access
Global positioning satellite
Half-duplex FDD
Hard Handoff
Information element
Internet Engineering Task Force
Inverse Discrete Fourier Transform
Inversion Fast Fourier transform
He th6ng anten thich nghi
Khali cAp phep
C6 ging toi da
Ty le lei bit
Giao dien gins tram g6c vi mong
Tram g6c
Bang thong
Truy nh$p khong day bang rung
Da truy nh$p chia
Quyln chung thoc
Tien t6 tan hob
Thiet bj din cu6i thue bao
Lap con plan chung
!Gem tra yang du
Lap con hOi to
Tieu chuin mat ma du lieu
Loa chip tin se dung
Bien al Fourier raj roc
The toe du hinh the khang c6
dinh
Huang xuting
Dieu khan m#t ma
Bang mat ma then to
M$t
ma-m#t ma
Ma Ma se I8i throe
Vien lieu chum ten thong Chau
Au
Chuyen d6i tom g6c nhanh
Da truy nh$p phan chia tin se
Song cang chia tin se
Sea 181 huang di
Bien dig Fourier nhanh
Djch vo ye tinh c6 djnh
Truy nh$p khang day c6 dinh
Ve tinh ctinh vj tan ciu
FDD ben song cong
Chuyen yang can
Phiin to thong tin
TO chat Icy su that Ice Internet
Bien doi Fourier rai roc ngtrqc
Bien d6i Fourier nguqc nhanh
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IP
ITU
KEK
LAN
LMDS
Internet Protocol
International Telecommunications
Union
Key encryption key
Local area network
Local multipoint distriution service
LOS
MAC
Line of sight
Medium access control layer
MAN
MDHO
MIMO
MMDS
MPEG
Metropolitan area network
Macro Diversity Handover
Multi input Multi output
Multichannel multipoint
distribution service
Moving Picture Experts Group
NCFG
NLOS
nrtPS
Network configuration
Non line of sight
Non-real-time polling service
OFDM
Orthogonal frequency division
multiplexing
OFDMA Orthogonal frequency division
multiple access
PARP
Peak-to Average Power Ratio
PCMCIA Personal Computer Memory Card
International Association
PDA
Personal Digital Assistant
PDH
Plesiochronous digital hierarchy
PDU
Protocol data unit
PER
Packet Error Rate
PHY
Physical layer
PKM
Privacy key management
Point - to - multipoint
PMP
PPP
Point-to-Point Protocol
QAM
Quadrature amplitude modulation
QoS
Quality of Service
QPSK
Quadrature phase-shift keying
REQ
Request
rtPS
Real-time polling service
Rx
Reception
SA
Security association
SAID
Security association identifier
SAP
Service access point
Thb tic Internet
Hiep hOi viers th8ng Qu6c ti
Khoa met ma Ichoa
mons 110i h0
Djch vv phan ph6i da diem nOi
hitt
Tia live xa
Lop (lieu khiin truy nhip m8i
trubng
Mang khu Arc thanh phi
Chuyin giao da clang rieng
Da dubng vim da dubng ra
Djch vp phin ph6i da diim da
kenh
Nhom chuyen gia nghien cuu WI
gang
Ciu hinh mpg
Tia kheng tnrc xa
Djch vµ tham db kheing thai gian
thrc
Ghep kenh chia tin s6 trvc giao
Da truy nhep chia tin sea tnrc giao
Cong suit Wong d6i cvc dai
Hiep hOi quOc to ye tim mach
nher ala may tinh ca nhan
That bi vv s6 ca nhin
Phan cep s6 din ding b0
Don vi da lieu filo tic
Ty le 16i gei
Lop vat lf
Quin ly khoi rieng
Diem da diem
Thb tic diem-diem
Dieu chi bien dO au phuong
Chit luong djch vi
Khoa djch pha ciu phuong
Yeu ciu
Djch vi them db thbi gian thvc
Thu
Tip hop bao met
BO nhin clang tap hop &to met
Diem truy nh$p djch vi
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SAR
SC
SDH
SDU
SF
SFID
SNMP
SNR
SS
STC
TDD
TDM
TDMA
TEK
Tx
UGS
UL
Synthetic aperture radar
Single carrier
Synchronous Digital Hierarchy
Service data unit
Service flow
Service Flow Identifier
Simple Network Management
Protocol
Signal-to-noise ratio
Subscriber Station
Space time coding
Time division duplex
Time division multiplex
Time division multiple access
Traffic encryption key
Transmission
Unsolicited grant service
Uplink
Rada khe het nit tao
Keith mang dun
Phan cAp só dog bO
Dan vi dtt lieu djch
Luang djch va
BO nh$n clang luang djch va
Tha tac quan 15, mang dcm gian
TS, le tin hieu/tap am
Tram thus bao
Ma thbi gian Idieng gian
Song dog chia thbi gian
Ghep kenh chia thbi gian
Da truy nhap Phan chia thin gian
Khoi mat ma luu ltrong
Truyen dAn
Djch va cap ph& tkr nguyen
Huang len
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Len NOI DAU
Ngaly nay nhu ciu th8ng tin lien lac chit con ngtrai ngay cling cao, nhit 11 d6i v6i
cac thiet bj khang day t6c dO cao, bang thong Ong nhu dien thoai Ichong day, Internet
kh8ng day... de mqi ngueri c6 the lien lac vet nhau 6 mai 16c, mai non vh quasi tang
hen la viec ma rOng din tri cho nguiri din 6 cac vung xa x8i heo 1>inh tren dit nuesc ta,
nai mat ca se ha tang vier th8ng chua den duct. Hien nay di c6 rat nhieu thong
mang kh8ng day ra dal nhu la WiFi, bluetooth... va met trong se d6 c6 the dap Ong
duqc nhu ciu tren IA WiMax. WiMAX chat you cung cap djch vu intemet kh8ng day
vai gist thanh re, t6c dO truyin cao kit n6i den cac thiet bj diu cu6i trong mat Ichoang
catch truyen 16n.
Viec triers khai he thong con g#p nhieu kh6 khan do nhieu nguyen nhan khich
quan cOng nhu chat quan. VI vay, em chip de tIi "nghien cuts chat lucmg djch vµ trong
WiMAX". Trong gi6i hen chuyen di nay, em di tim hieu kY thuot vI nhOng Ich6 khan
cos cOng nghe WiMAX khi ap dung rang rill 6 nu& ta.
Chuyen de g6m c6 b6n chuong:
Chuang 1: T6ng quan ve he th6ng WiMAX.
Chuang 2: Cac ki thult stl dung trong WiMAX.
Chuang 3: Gill phap c8ng nghe WiMAX.
Chuang 4: Ling dung c8ng nghe WiMax.
Do died gian cOng nhu trInh dO con Ilan chi, chuyen
thieu sot, em rot mong nhan duqc y kien Nag g6p.
de khOng tranh khOi nhOng
Em xin chan thanh cam an they Hoang Trang Minh, ngtrei dit dinh huang, huang
den vi tan tinh chi biro em hohn thanks chuyen de nay.
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Trang 1
TONG QUAN VE He THONG WiMAX
CHIXYNG 1: TONG QUAN VE H$ THONG WiMAX
1.1. WiMAX la gi?
WiMAX (Worldwide Interoperability for Microwave Access) la mot deg nghe
khOng day bang rung, h8 trq khii !tang kit noi bang thing rung toc dO cao cho ci mpg
co djnh lin mpg khong day di gong. Hai phien ban ctia WiMAX di duqc IEEE dua ra
nhu sau:
Binh 1.1 Md hinh wing WiMAX
Fixed WiMAX (WiMAX co djnh): Dora tren lieu chuin IEEE 802.16-2004, duqc
thiet ke thich hqp cho clang truy nhkip c6 djnh. Trong phien ban nay sir dung ky thu$t
ghep kenh phan chia theo tin s6 trtrc giao OFDM (Orthogonnal Frequency Division
Multiple) hoot dung trong ci m6i trubng shin thing - LOS (line-of-sight) vi kitting
nhin thing - NLOS (Non-line-of-sight.
Mobile WiMAX (WiMAX di dung): dua tren fieu chuin IEEE 802.16e, h8 trq cho
clang di dung, cung cep khi tiling chuyen yang - handoff vi chuyen mpg - roaming.
Tieu chuin nay sir dung phuong thirc da truy c$p ghip kenh chia tin so tnrc giao
OFDMA (Orthogonnal Frequency Division Multiple Access) - li su ph6i hqp cc5a ky
thuot ghep kenh va lcy thuit phan chia tin s6 c6 tinh chit Ulm giao, nit pht hqp voi
m8i trutng truyen dAn da dubng nhim tang thong luqng ding nhu dung luong
tang dO linh hoot trong vies quin ly tii nguyen, liin dung tai da ph6 tin, chi thin khh
Ming phh song yeti citc loci dja hinh da dung.
WiMAX da ducc phat trien vi ;chic phuc duct nhitng nhuqc diem cult citc c8ng
nghe truy c$p bang rang tru6c day, cu the:
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TONG QUAN VE Ht THONG WiMAX
— Ciu true mem deo: WiMAX h6 trq clic ciu trim he thong bao g6m diem da
diem, c8ng nghe lir& (mesh) vi phu sting khip mqi not Dieu lchien truy nh$p
m8i twang - MAC, phut:mg tien truyen din h6 trq diem - da diem va dich vu
rang khip b6i
mOt khe thin gian cho m6i tram di dang (MS). Neu c6
duy nhit mOt MS trong ming, tram g6c (BS) sE lien lac v6i MS tren ca set
diem - diem. Mat BS trong mOt ciu hinh diem - diem c6 the sir ding anten
chum hgp han bao phu clic khoing each xa han.
a
— Chit lueing djch vu QoS: WiMAX c6 the dirge t6i in dOng d6i yen h6n hqp
luu luqng sE duct mang. CO 4 loci djch vu dirge h6 trq: djch vu tip phut to
nguyen (UGS), djch vu hei Wong thbi gian thvc (rtPS), djch vu hal yang
khOng thin gian thirc (nrtPS), n6 km tot nhit (BE).
— Tries kluti nhanh, chi phi thip: So sloth von trien khai care giii phap co day,
WiMAX yeu eau it ho#c kh8ng eh bit rent sir xay dying thiet lop ben ngoli. VI
du, duo h6 de Mo ranh cat dubng cap thi kh8ng yeu c$u. Ngotli ra, doa ten
clic chuin m6 cha WiMAX, se kh8ng c6 so dOc guy& ye lieu chain nay, din
den viec chnh trash chit nhilu nha sin xuit, lam cho chi phi diu to mOt he
thong gut= ding ke.
— Djch vu da mat: Cach thirc not ma QoS dirge pha ► phtit n6i chung doa vac so
thea thu$n mire djch vu (SLA - Service Level Agreement) gitta nha cung cap
dich vu va ngubi sir ding cu6i can. Chi flit han, mOt nha cung alp djch vu
c6 the cung cap clic SLA khac nhau tai care thug bao ldiac nhau, thklm chi till
nlittng ngubi dhng !chat nhau sir ding sung MS. Cung cep truy nh$p bang
rung co dinh tong Meng khu voe d8 thi va ngotti 8, not chit luqng cap deg
thl kbm ho#c dim vao 16.6 khan, khlc phuc thiet bj s6 tong nhttng yang met
da thip not ml cat nhan t6 c8ng nghe vh kinh ti thyt hien phut trier bang
rang rut thich thirc.
— Tinh Wang thich: WiMAX duct )(Ay (long de tors thinh mOt chuin quOc te,
Mo ra so ding d6i vdi ngubi dOng cu6i sung truyen tai vi sir dyng MS
chit hq 6 clic vi tri khitc nhau, hetet yeti cat nhti cung cap dich vu khac nhau.
Tinh tucmg thich bito ve so ditu to cua mOt nha van hash ban diu vi n6 c6 the
chqn lira thiet bi ttr care nhi
thiet
a
a
— Di ding: IEEE 802.16e b6 sung them tic dec diem chinh h6 trq khi !rang di
dung. Nhttng cii den lap vat ly OFDM (ghep kenh phin chia tin so titre giao)
va OFDMA (da truy nh$p pit chia tin s6 trot giao) de h6 trq cat thiet bi va
the dich sit tong mOt m8i tnrbng di dung. Nhttng cii lien nay, bao g6m
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TONG QUAN VE Ile THONG WiMAX
OFDMA mit rung duqc, MEMO (Multi In Multi Out - nhieu diu vac nhieu
diu ra), vi h8 thy del vat the dO idle/sleep vit handoff, se cho phep kha Wing
di dung (fly du 6 the dO tea 160 km/h. Mang WiMAX di dung cho phep ngtriti
sfr dung c6 the truy cop Internet khang day bang thong rung Ali bit cu dfu c6
phi sting WiMAX.
— Hog dung NLOS: Khii tiling hog dung curt mang WiMAX ma Idling did hei
tern nun thing gitta BS vi MS. KM Wing My cos n6 gift') ac sin phim
WiMAX phAn phit dii thong rung trong met mei truing NLOS.
— Phu sting rung han: WiMAX h8 trq dung nhieu mire dieu chi, bao gem
BPSK, QPSK, 16QAM, 64QAM. Khi yeu au yeti bO khuich dg tong suit
cao vi hog dung vol di& the mire thip (vi du BPSK ho(ic QPSK). Cac he
thong WiMAX c6 the phi sang mOt yang dirt 13± rung !chi dutrng truyin gifts
BS vi MS kiting bj an frit Met rung pham vi bj giOi hp hien tai mitt WLAN
ding cung (hotspot) den phi= vi rung (hotzone). O nhttng dieu kien tot nil&
ce the dot (bye phgn vi phi sting 50 km v6i toe dO dit lieu bj ha thip (mOt
vii Mbit/s), pham vi phi sting dien hinhli gin 5 km v6i CPE (NLOS) trong
nhi vit gin 15km vii mOt CPE duet not vii mOt anten ben ngoii (LOS).
— Dung lucmg cao: C6 the dot duce dung luqng 75 Mbit/s cho cac tram g6c yeti
mOt kenh 20 MHz trong cac dieu kien truyin song tot nhit.
— Tinh mei rung: Chuin 802.16 -2004 M trq cac dii th8ng kenh dui s6 v8 tuyen
(RF) mem deo vi sfr dung loi the kenh tin s6 nay nhu la mOt each di tang
dung luqng martg. Chuin cftng djnh r8 h8 trq deli vai TPC (dieu khien c8ng
suit phit) vh cic phep do chit luqng kenh nhu the Gang cu them vtio de h8
trq sa dung ph6 hieu quit. Chuin dA dupe thiet Ice de 4t tt le len tai hang
tram th#m chi hang nghin nguOi sa dung trong mOt kenh RF. H8 trq nhieu
kenh cho Step cac nhb the to thiet bj cung cap mOt phuang tien de chi trcmg
vho phi= vi su dung ph6 vi nlang quy djnh cip phit duce mai r8 bid cac nhi
v#n hinh trong the thj truing quac to thay deli !chic nhau.
— Bin mkft: Bing each ma hOa the lien kit v8 tuyin gifta BS vi MS, su dung
chuin ma hba tien tien AES, dim bao sv tan von ctia Ott lieu trao deli qua
giao dien v6 tuyen. Cung cip cho ac nha v#n Minh vii sv bito ve manh
cheng lai nhftng hAnh vi dinh cip djch vu.
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TONG QUAN VE H$ THONG WiMAX
1.2. Cic chuAn chit WiMAX
1.2.1. Chan IEEE 802.16-2001.
ChuAn IEEE 802.16-2001 duqc hoar) think vho thing 10/2001 vh duqc cemg 136
vho 4/2002, djnh nghia dac ti k9 thu$t giao din kitting gian WirelessMANni cho Mc
ming vbng d8 thj.
Dac diem chinh Ma IEEE 802.16-2001:
+ Giao dies !thong gian cho he thing truy nh$p khong day bang rung do djnh
host dung 6 did tin 10 - 66 GHz, cAn th6a man tim thin thing.
+ Lip vat 15, PHY: WirelessMAN-SC.
+ T6c dO bit: 32 -134 Mbps yeti kenh 28 MHz.
+ Dieu chi QPSK, 16 QAM vi 64 QAM.
+ Cic dii thong kenh 20 MHz, 25 MHz, 28 MHz.
+ Ban icinh cell: 2 - 5 Ian.
+ Ket n6i c6 djnh hueng, MAC TDWIDMA, QoS, bin mot.
1.2.2. Chan IEEE 802.16a.
Vi nhong kith khan trong then khai chuin IEEE 802.16, hueng vho vies sir dung
tin s6 tir 10 - 66 GHz, mOt dv in sou d6i c6 ten IEEE 802.16a da duqc holn thhnh vho
thing 11/2002 vh duqc c6ng b6 via thing 4/2003. Chuim nay duqc me rung h6 trq
giao dien kh8ng gian cho nhemg ten s6 trong bang tin 2-11 GHz, bao g6m ci nhttng
phi cup phap vh khong cep phip vi khemg cin that man dieu ;den tim nhin thing.
Dac diem chinh curt IEEE 802.16a nhu sau:
+ B6 sung 802.16, cic hieu chinh MAC vi cic dac diem PHY them vho cho
2-11 GHz (NLOS).
+ Tic dO bit: teri 75Mbps yeti kenh 20 MHz.
+ Dieu chi OFDMA vOl 2048 sting mang, OFDM 256 sting mang, QPSK,
16 QAM, 64 QAM.
+ Dii thong kenh c6 the thay d6i gilts 1,25MHz vi 20MHz.
+ Ban lcinh cell: 6 - 9 lcm.
+ Lop vat PHY: WirelessMAN-OFDM, OFDMA, SCa.
+ Cic chile niing MAC them vtio: h6 trq PHY OFDM vi OFDMA, h8 trq
cemg nghe Mesh, ARQ.
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TONG QUAN VE lit THONG WiMAX
1.2.3. Chula,: IEEE 802.16-2004.
Tilling 7/2004, chuim IEEE 802.16 - 2004 hay IEEE 802.16d dupe chip nh$n
thOng qua, ket hap cuts cac chuk IEEE 802.16 - 2001, IEEE 802.16a, ling dung LOS 6
did tan s6 10- 66 GHz vi NLOS ti did 2- 11 GHz. Khii Ming v8 tuyen b6 sung nhu lh
"beam forming" vi kenh con OFDM.
1.2.4. Chuin IEEE 802.16e.
Chan khong day bang thong rung 802.16e vai ten gqi Mobile WiMax cho phep
tram g6c ket n6i tai nhitng thiet bj dang di chuyin. Chum nay gap cho the thiet bj a
cac nhe sin xuit ray cti the lam viec, tutmg thich t6t voi cac thiet bj tfc ciic nha san
xuit khac. 802.16e hqat dung 6 cac bang tin nhe han 6 GHz, t6c dg len teri 15 Mbps
yen kenh 5 MHz, ban lcinh cell to 2 - 5 km.
WiMAX 802.16e c6 h6 trq handoff vi roaming. Su dung SOFDMA, mOt c8ng
nghe dieu the da song mang. Cac nhi cung cep dich vy tan khai 802.16e cling c6 the
su dung Truing d6 cung cup dich vp c6 djnh. 802.16e h6 trq cho SOFDMA cho phip s6
song mang thay d6i, ngoii the m8 hinh OFDM vi OFDMA. Sr phAn chia sting mang
trong m8 hinh OFDMA dirge thiet ke d6 t6i thieu inh Wing cua nhigu phis thiet bj
ngutti dOng yeti anten da hueng. Cu the han, 802.16e dim ra h6 trq cii den h6 trq
MIMO vi AAS, cling nhu cit handoff cimg vi mem. NO cling cii tien cac khi nAng
tilt kiem c8ng suit cho cfic thiet bj di dung vi cic dac diem bao mot linh hoot han.
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TONG QUAN 'VE HE THONG WiMAX
DM tin s6
10-66GHz
<11GHz
<6GHz
M6i truang truyen
Line of Sight (LOS)
Non Line of Sight
(NLOS)
NLOS
T6c dO
32-144Mbps
Up to 70 Mbps
10M - 30M
Dieu the
Dieu the dun sOng
Mang QPSK
OFDM 256 sOng
mang con QPSK,
16 QAM, 64QAM
S-OFDMA QPSK,
16 QAM, 64 QAM
C6 dinh
c6 dinh
CO the cho the dO di
Mirc di ding
chuyen thip
Bang th6ng kenh
20,25,28MHz
5- trtn 20MHz
1.25-20 MHz
Bin Icinh cell
1.7-5km
5 tai 10Ian; toi da
50 km thy thuOc
vao dieu kien
truyen
1.7-5km
Bang 1.1 So seinh cac chain IEEE 802.16
Voi nhftng dtic diem va su phat den cult cac chuin IEEE802.16 n6i tree, to co the
'than thiy dtrqc sulchic nhau ca ban cang nhu firth ke thira caa cic chuin nay.
IEEE yin dang nghien cuv va dui ra cac chuin 802.16 mai nhim hoen thien
chuin nay. Vi du nhu: IEEE 802.16f-2005, IF.F.E802.16g-2007 b6 sung cho thu tyc
quitn lfr ke hooch vtl djch Ai, IEEE 802.16k-2007; IFFY. 802.16-2009 cling c6 tieu
chart IEEE 802,16-2.004, 802.16e-2005 vi 802.16-2004/Cor1-2005, 802.16f-2005,
vi 802.16g-2007, 802.16m...
1.3. Phi WiMAX.
WiMAX - thiet bi mem deo se dtrqc phep hoot ding tong ca hai dai duct ding
Icfr va kh8ng ducm ding Icfr.
1.3.1. Bang tin piing kj
Cfic giai phap clang k9 cung cep cac tru diem chit lucmg djch vu duct chi thien
cao han cac giai phitp !thong clang k9, chip nh$n NLOS tot han a cac tin s6 thip, ne
co mOt nein quy deg suit dutmg xu6ng ring han va co the h6 trq cac anten trong nhtl
t6t han. Giai phip (tang kfr cho phep kiem so& qua cach sir dung ph6 vil Watt.
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TONG QUAN VE He THONG WiMAX
a Bins tin 1111nz $ 2.5 GHz
DA dirge dip ph& trong phin 16u the gi6i, bao gem bile M9, my Latin, D8ng vu
Tay Au va nhieu ming caa chau A - Thai Binh Duang nhu mOt bang tin dang 1c9. MOi
qu6c gia thubng cep phit dal khic nhau, vi v$y ph6 dupe cup phit qua cac vang c6 the
tfr 2,495 GHz den 2,690 GHz. Tong ph6 kha dung 18 195 MHz, bao gtom cac did pheng
ye Nal cac kenh MDS, gba 2.495 GHz va 2.690 GHz. HO trq FDD, TDD. Ph6 tren tnoi
dling k9 la 22.5 MHz, mOt block 16.5 MHz vtl mOt block 6 MHz, tong s6 8 clang 1E9.
b. Bins tin an Id 3.5 GHz.
Chau Au, vien chuin vier th8ng Chau Au dA plan ph6i dal 3,5 GHz, bit diu
dirge sir dung cho WPLL, cho cac gi8i phap WiMAX clang ky. T6ng ph6 khi dung
thay 461 then qu6c gia nhung ned chung khoing 200MHz gifts 3,4 GHz vi 3,8 GHz.
HO trq FDD, TDD. MOt vii qu6c gia chi sfr dung FDD trong khi cac qu6c gia khic cho
s* dung FDD hokIc TDD. Ph6 ben m61 slang Icy thay d6i ta. 2x5MHz den 2x56 MHz.
1.3.2. Bing tin khOng ding 45 56Hz
Phan 16n cac qu6c gia tom the gi6i dA stl dung ph6 5 GHz cho Mc bang ding
kheng long k9 nhu: Wing 5,15 GHz va 5,85 GHz
Cac giiti phap kitting dling 1c9 cung cep mOt vii thu$n lqi chinh ham cac gi8i phap
Clang k9, bao Om chi phi ban dL thip han, rut m nhanh han, vi mOt bang chung c6
the dirge su dung 6 phin 16n the gi6i. Cac ici kb My dang thu but sir quan tam v8 c6
khi Ming cho sir chip nhen bang rung nhanh ch6ng.
Tuy nhien mOt giai phap kh8ng clang 1c9 thi khi nAng nhiL cao han, va nhieu sv
canh tranh desi tied Mc nha kinh doanh bit dung sin cho viec trim khai. MOt gi8i phip
kitting clang k9 se khang duqc xem nhu mOt sv thay the cho giai phip dang ky. MOi
giai phip cung cep mOt thi twang khic nhau dva vio str thoa hiep gifts chi phi vi QoS.
1.3.3. Cdc being tin thtyc ii xuit cho WIMAX win thi gtdrt
Cac bang tan dirge Diln dart WiMax trong xem xdt va v$n dung ca quan quip
19 tan so cac nu6c phan b6 cho WiMax la:
— Bang tin 2,3-2,4GHz (2,3GHz Band): dirge de St sti . dung cho Mobile
WiMAX. Tai Han Qu6c bang My dit dirge trien khai cho WBA (WiBro).
— Bang tin 2,4-2,4835GHz: duqc de xuit sfr dung cho WiMAX trong Wang lai.
— Bang tin 2,5-2,69GHz (2,5GHz Band): duct de St sir dung cho WiMAX di
dOng trong giai don diu.
— Bang tin 3,3-3,4GHz (3,3GHz Band): dirge de xuit s6r Mpg cho WiMAX c6 djnh.
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TONG QUAN VE He THONG WiMAX
— Bang ten 3,4-3,6GHz (3,5GHz Band): &roc de xuit sfr dung cho WiMAX c6 djnh
trong giai door du: FWA (Fixed Wireless Access)/WBA (WideBand Access).
— Bang ten 3,6-3,8GHz: dirge de 'cult so. dung cho WiMAX c6 djnh (WBA) vil
cap cho Chau Au. Tuy nhien, bang 3,7-3,8 GHz dit dirge dung cho ve tinh vigil
tilting Chau A, nen bang ten My khong dirge st• dung cho Wimax Chau A.
— Bang tin 5,725-5,850GHz: dirge di xuat s* dung cho WiMAX c6 djnh trong
giai clop du.
— Ngoli ra, mOt s6 bang tin Ichic phitn b6 cho BWA cOng dirge mOt so nuoc xem
xat cho BWA/WiMax la: bang tin 700-800MHz (< 1GHz), bang 4,9-5,1GHz.
1.3.4. Cdc bang hiss it Viet Nam cd khd niing dank cho WiMAX
— Bang tin 2,3-2,4GHz: C6 the danh (loon bang tin My cho WiMAX. Bang tin
2,3-2,4GHz thich hop cho ca WiMAX c6 djnh va di (tong.
— Bang tan 2,5-2,69011z: Bang tin My hien nay dang dirge s* dung nhieu cho
vi ba vi MMDS Nip thing chti yeu 6 Hi nOi wit thinh ph6 H6 Chi Minh)
Ngotti ra, bang tan nay II mOt trong cac bang tan duce de )(at su dung cho
3a Bang tin nay loi li bang tan dirge dank gia la thich hop nit& cho WiMAX
di ding va da duce Dign din WiMAX )(sic nhen chinh thtic 11 bang tin
WiMAX. MOt s6 nuke cOng d1 danh bang tin nay cho WiMAX nhu My,
Mehice, Brazil, Canada, Singapo. VI v$y, de nghj danh bang tin 2,5-2,69GHz
cho WiMAX.
— Bang tan 3,3-3,4GHz: Theo Qui hooch ph6 tin s6 VTD qu6c gia, bang tin
nay duce Olin b6 cho the nghiep At Ves tuyen djnh vi, c6 djnh ve ltru ding.
Ve phis clan sir va quilt' su veil chua co he thong Mc, duqc trien khai tong
bang tin my. Do do, c6 the cho phep s* dung WiMAX trong bang ten 3,3 3,4GHz.
— BAng tin 3,4-3,6GHz, 3,6-3,8GHz: D6i v6i Viet Nam, he thong 4 tinh
VINASAT su dung mOt s6 doon bang tan trong bang C va Ku, trong d6 cal
bang ten 3,4-3,7 GHz. Ngohi ra, (loon bang tan 3,7-3,8 GHz m#c de chua su
dung cho VINASAT nhung c6 the dupe s* dung cho cac from mit dat lien loc
v6i the he thong ve tinh !chic. VI v$y kheong nen tan khai WiMAX trong
bang tin 3,4-3,8 GHz.
— Bang tan 5,725-5,850GHz: Hien nay, bang tin My da dupe BO qui djnh dart
cho WiFi. Neu cho phdp tan khai WiMAX trong bang tan My thi cOng se
hp 64 bang tin dinh cho WiFi. Bang tin nay c6 the thich hop cho the he
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TONG QUAN VE He THONG WiMAX
thong WiMAX b vang n8ng th8n, vbng Mu, vang xa, b d6 c6 the cho phep he
thong WiMAX phat veti deg suit cao han de giarn gig thanh then Mug he
thong WiMAX. VI voy, de nghj cho phep trier khai WiMAX trong bang tin
5,725-5,850GHz nhung WiMAX phiti clang chung bang tin vi phai bao ve
cic he th6ng WiFi.
Nhu vtly, vbi hien tang sil dvng bang tin tai Viet Nam nhu tren, cac bang tin c6
Icha Wing dinh cho WiMAX et Viet Nam la:
— Bang tin 2,3-2,4GHz vi 3,3-3,4GHz cho cic he thong truy c(ip kh8ng day
bang rung, kg ea WiMAX.
— Bang tin 5,725-5,850GHz cho cast he thOng truy cop kh8ng day bang rung, ke ca
WiMAX nhung cic he th6ng nay phii clang chung bang tin yeti cic h>i thong
WiFi vOi dieu kien bao ve ctic he thong WiFi hog dOng trong bang tin nay.
— Bang tin 2,5-2,690GHz cho cic he thong truy cop !thong day bang rung, kg
ca IMT-2000 va WiMAX.
Chlnh phi da cep phep thu nghiem djch vp WiMAX di dOng tai bang tin 2,3-2,4
GHz vii bang tin 2,5-2,69 GHz. (Theo deg van s6 55351VPCP-CN dm Van phemg
Chinh phi).
1.4. Truyin song.
Trong khi !lieu ding nghe hien dang tan tai cho !thong day bang rung chi c6 the
cung cep phi sang LOS, Gang nghe WiMAX ducrc toSi uu de cung cep phi sang
NLOS. CEng nghe den den ctia WiMAX cung cap tat nhit cho ca hai. Ca LOS vi
NLOS bj anh huong bei cic d#c tfnh dirbng truyen m8i tru&ng cis chimg, ten thit
dutmg don, vi ngan guy' kit nhi v8 tuyen.
Trong lien lac LOS, mOt tin hieu di qua mOt dirtmg Ulm tiep vi Ichong N tic
nghen tir may phit din may thu. MOt lien lac LOS yeu cau phin Ion mien Fresnel this
nhAt thi kh8ng bj nein cim cis bit Id vet can nao, neu lieu chain nay ;thong thda man
thi c6 sir thu nh6 ding ke cubng dO tin hien quan sit. DO her Fresnel duct yeu ciu phu
thuOc vao tin s6 hoM Ong vi Ichoing each gifts vi tri miy phit vi may thu.
Trong lien lac NLOS, tin hieu den miy thu qua phin xa, tin xa, nhigu xa. Cic tin
hieu den may thu bao gam cac thanh phin hY dubng tnrc dip, cic dutmg duqc phim xp
nhieu lin, Wing luqng bj tin xa vi cic thrtmg truyen bj nhigu xa. Cic tin hieu nay c6
Idioang trg khic nhau, suy hao, phan cvc vii dO on djnh quan hu vbi dubng truyen trim
dip la nguyen nhan gay ra nhigu ISI vi mio tin hieu. Dieu d6 !thong phai la van de deli
ved LOS, nhung yeti NLOS thi Iai la van de chinh.
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