C S SAP ) LOP con hOMU Ogc M
3.2. MO HINH THAM CHIEU
Hinh 3.1 mint' hoa m8 hinh tham chieu va pham vi cua chuin. Trong mo hinh tham chieu nay, lap PHY Wang ung veri lop 1 (16p vat 19) va lap MAC twang (mg veri lap 2 (lop lien kEt da lieu) trong m8 hinh OSI.
Chuang 3: Kiln (Sc twig truy cap WiMAX
Lap con hal ty dac to dich Ai -
CS -4— ATM. Ethernet. IP. 802.110
Lop con phan chung - CPS co- Packing, Fragmentation. OoS, ARO
Ltrp con bao mat Authentication. Key Exchange, Encryption
Lap vat Iy OFDM, Ranging, Power Control, DFS. Transmit. Receive
Hinh 3.2. C/uk ming cac lop trong ma hinh phdn lop chudn IEEE 802.16
Tai tram thu, phan cirng WiMAX flip nhAn da lieu tir cac 16p cao. Hinh 3.3 mo
to huong di chuyen tha lung do lieu qua cac lap. Milli 16p se dive hien
encapsulation (clang gel) aft lieu nhk duqc tir cac lerp tren. Tai lop thap nhit, do
lieu duqc truyen duel dang bit qua midi true:rig truyen den ncri nha'n. Tai tram thu, dO lieu se duqc decapsulation (m6 g6i) d'ecitc th6ng tin can thi'et va cac thong tin nay duqc giri Len the 16p cao ham.
Data
Lap con het tu dew lit
dich vu Tieu de CS
r
Payload
r
Lop con Oen chung
MAC/ Lev con Privacy riOu de
MAC Payload CRC
r r
Lop vet hp
Bits
Hinh 3.3. Luang dr: lieu qua cac lop
Gifta 16p con phan chung MAC va lOp con bag mjt kh8ng djnh ngliia diem truy nhap djch vu. Cac packet tir 16p con phan chung MAC Iduing duqc encapsulation tai lop con bao mjt. Phan fieu de 16p con phan chung MAC se bieu thi thong tin ma hea payload. Qua trinh ma Ilea payload duqc thyme hien tai 16p con bao mot.
Chuang 3: Kiln trac mgng truy cpp WiMAX