MAC Layer:

Service-Specific Convergence Sublayer (CS)

n         MAC CS receives higher level data

n         Provides transformation and mapping into MAC SDU

n         ATM CS and packet CS

MAC Common Part Sublayer (CPS)

n         System access, bandwidth allocation, connection management

n         QoS provisioning

Privacy Sublayer

n         Authentication, secure key exchange, encryption

PHY Layer:

Four different physical layer specifications;

SC, SCa, OFDM, OFDMA.

WiMAX Forum and IEEE 802.16

l         Worldwide interoperability for Microwave Access (WiMAX);

l         An alliance of telecommunication equipment and component manufacturers and service providers

l         Promotes and certify the compatibility and interoperability of BWA products

l         Adopted two version of the IEEE802.16 standard

-          Fixed/nomadic access: IEEE 802.16-2004 OFDM PHY layer

-          Portable/Mobile access: IEEE 802.16e

IEEE 802.16 Physical Layer Attributes:

l         Defines duplexing techniques (TDD, FDD)

l         Supports multiple RF bands

-          10-66 GHz for LOS

-          Below 11 GHz for NLOS

l         Flexible bandwidths

-          Up to 134 MHz in 10-66 GHz band

-          Up to 20 MHz in < 11 GHz band

l         Defines multiply PHYs for different Applications

-          CS for point-to-point long range application

-          OFDM for efficient Point-to-Multi-Point high rate applications

-          OFDMA more optimized for mobility, using sub-channelization  on Downlink and Uplink

l         Specifies Modulation and Channel coding schemes