Wimax standards and Security The Wimax

ETSI HIPERLAN Standard

The ETSI has developed analogous standards to the IEEE 802.11 and IEEE
802.16 solutions, known as HIPERLAN and HIPERMAN, respectively. These technologies are considered to be superior from a throughput and design perspective compared to their IEEE 802 counterparts but nevertheless have not been adopted or deployed widely. In addition to the IEEE 802.16 stan- dard, the WiMAX Forum has also supported certification of ETSI HIPERMAN standards-based equipment.
The HIPERLAN WLAN technology standard [6] was established by ETSI as a way to enable wireless network connectivity on a variety of platforms: third-generation cellular, home wireless LAN, and corporate wireless LAN, for example. The ETSI Broadband Radio Access Networks (BRAN) group has developed the second-generation HIPERLAN/2 as the follow-on stan- dard to HIPERLAN/1, similar to the IEEE 802.11 evolution of standards (from the 11 Mbps “b’’ standard to the 54 Mbps “g’’ standard). HIPERLAN/2 operates in the 5 GHz UNII band. It supports data rates ranging from 6 to 54 Mbps via an OFDM format. HIPERLAN/2 uses a TDMA scheme to share the medium among multiple users. Figure 1.5 illustrates the basic architecture of HIPERLAN.
HIPERLAN topologies are similar to cellular infrastructure topologies, in that there are base stations and wireless users. As it complies with the BRAN PHY and data link control (DLC) standards it is interoperable with a vari- ety of other European core network standards such as GSM. There are two modes of operation within HIPERLAN: centralized and direct. Centralized mode is analogous to the infrastructural mode within the IEEE 802.11 stan- dard, where cellular-like infrastructure is required to relay packets from users through base stations to other users. The direct mode is analogous to the ad hoc mode in IEEE 802.11, where users can send and receive packets to and from each other without traversing an infrastructure node. HIPERLAN supports

Network Convergence Sublayer