Ec8004 wireless networks unit 1 hiperlan1
- 1. HIPERLAN 1
- 2. HIPERLAN HIPERLAN 1 as a WLAN allowing for node mobility and supporting ad-hoc and infrastructure-based topologies HIPERLAN 1 was originally one out of four HIPERLANs proposed, as ETSI decided to have different types of networks for different purposes. The key feature of all four networks is their integration of time-sensitive data transfer services. Over time, names have changed and the former HIPERLANs 2, 3, and 4 are now called HiperLAN2, HIPERACCESS, and HIPERLINK. The current focus is on HIPERLAN2, a standard that comprises many elements from ETSI‘s BRAN (broadband radio access networks) and wireless ATM activities.
- 3. HIPERLAN 1 Data transmission point-to-point, point-to-multipoint, connectionless 23.5 Mbit/s, 5.1 – 5.3 GHz,1 W power, 2383 byte max. packet size Services asynchronous and time-bounded services with hierarchical priorities compatible with ISO MAC Topology infrastructure or ad-hoc networks transmission range can be larger then coverage of a single node ("forwarding" integrated in mobile terminals) Further mechanisms power saving, encryption, checksums
- 4. An innovative feature of HIPERLAN 1, which many other wireless networks do not offer, is its ability to forward data packets using several relays. Relays can extend the communication on the MAC layer beyond the radio range. For power conservation, a node may set up a specific wake-up pattern. These nodes are called p-savers and need so-called p-supporters that contain information about the wake-up patterns of all the p-savers they are responsible for. HIPERLAN 1
- 5. Medium Access Scheme of HIPERLAN 1 Elimination – Yield Non – preemptive Priority Multiple Access (EY – NPMA)