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Hiperlan

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Hiperlan

  1. 1. Company LOGO HIPERLAN
  2. 2. Index Introduction Motivation Standards Reference Model Types HIPERLAN/1 HIPERLAN/2 HIPERACCESS HIPERLINK Comparison Between Types Failure Web references
  3. 3. What is HIPERLAN ? Hiperlan – High Performance Radio Lan WLAN Standard. It was initiated by the RES-10 group of the ETSI as a pan- European standard for high-speed wireless local networks. In ETSI the standards are defined by the BRAN project (Broadband Radio Access Networks).
  4. 4. Motivation for HIPERLAN Massive Growth in wireless and mobile communications. Emergence of multimedia applications Demands for high-speed Internet access Deregulation of the telecommunications industry
  5. 5. Standard Of HIPERLAN HIPERLAN is a European family of standards on digital high speed wireless communication. Spectrum : 5.15-5.3 GHz and the 17.1-17.3 GHz. Ensure the possible interoperability between different manufacturers. Defines a common air interface including the physical layer for wireless communications tools
  6. 6. HIPERLAN Reference Model
  7. 7. Proposed Types HIPERLAN 1 HIPERLAN 2 HIPERACCESS HIPERLINK
  8. 8. HIPERLAN /1 Characteristics Data transmission  point-to-point, point-to-multipoint, connectionless  23.5 Mbit/s, 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 mechanism  power saving, encryption, checksums
  9. 9. HIPERLAN layers, services, and protocols MSAP HCSAP MSAP HCSAP HM-entity HC-entity HM-entity HC-entity MAC layer CAC layer PHY layerHP-entity HP-entity LLC layer HMPDU HCPDU data bursts MAC protocol CAC protocol PHY protocol MAC service CAC service PHY service MSDU MSDU HCSDUHCSDU
  10. 10. HIPERLAN /1 - Services and protocols CAC service  definition of communication services over a shared medium  specification of access priorities  abstraction of media characteristics MAC protocol  MAC service, compatible with ISO MAC and ISO MAC bridges  uses HIPERLAN CAC CAC protocol  provides a CAC service, uses the PHY layer, specifies hierarchical access mechanisms for one or several channels Physical protocol  send and receive mechanisms, synchronization, FEC, modulation, signal strength
  11. 11. HIPERLAN/1 Physical Layer Functions  modulation, demodulation, bit and frame synchronization  forward error correction mechanisms  measurements of signal strength  channel sensing Channels  3 mandatory and 2 optional channels (with their carrier frequencies)  mandatory • channel 0: 5.1764680 GHz • channel 1: 5.1999974 GHz • channel 2: 5.2235268 GHz  optional (not allowed in all countries) • channel 3: 5.2470562 GHz • channel 4: 5.2705856 GHz
  12. 12. HIPERLAN 1 - Physical layer frames LBR synchronization data0 data1 datam-1 . . . HBR
  13. 13. HIPERLAN 1 - CAC sublayer Channel Access Control (CAC)  assure that terminal does not access forbidden channels  priority scheme Priorities  5 priority levels for QoS support  QoS is mapped onto a priority level with the help of the packet lifetime (set by an application) • if packet lifetime = 0 it makes no sense to forward the packet to the receiver any longer • standard start value 500ms, maximum 16000ms • if a terminal cannot send the packet due to its current priority, waiting time is permanently subtracted from lifetime • based on packet lifetime, waiting time in a sender and number of hops to the receiver, the packet is assigned to one out of five priorities • the priority of waiting packets, therefore, rises automatically
  14. 14. HIPERLAN /1 MAC Layer Compatible to ISO MAC Supports time-bounded services via a priority scheme Packet forwarding  support of directed (point-to-point) forwarding and broadcast forwarding (if no path information is available)  support of QoS while forwarding Encryption mechanisms  mechanisms integrated, but without key management Power conservation mechanisms  mobile terminals can agree upon awake patterns (e.g., periodic wake-ups to receive data)  additionally, some nodes in the networks must be able to buffer data for sleeping terminals and to forward them at the right time (so called stores)
  15. 15. HIPERLAN/2 Features High speed transmission (54 Mbit/s) Connection-oriented Quality-of-Service (QoS) support Automatic frequency allocation Security support Mobility support Network & application independent Power save
  16. 16. HIPERLAN/2 Reference Model
  17. 17. Table 1: PHY modes defined for HIPERLAN/2.
  18. 18. Data Link Layer Functions
  19. 19. Data Link Layer Functions
  20. 20. MAC frame structure
  21. 21. Convergence Layer
  22. 22. Generic Model
  23. 23. HIPERACCESS HIPERACCESS provides outdoor, high speed (25 Mbit/s typical data rate) radio access, it provides fixed radio connections to customer premises and is capable of supporting multimedia applications. Other technologies such as HIPERLAN/2 might be used for distribution within the premises. HIPERACCESS will provide the wide area broadband access network connections to residential households and small businesses.
  24. 24. HIPERLINK Interconnecting high data rate sources such as (access) networks requires high bit rates and large channel capacities. HIPERLINK provides point-to-point interconnection at very high data rates, e.g. up to 155 Mbit/s over distances up to 150m.
  25. 25. Comparison Between Types HIPERLAN 1 HIPERLAN 2 HIPERLAN 3 HIPERLAN 4 Application wireless LAN access to ATM fixed networks wireless local loop point-to-point wireless ATM connections Frequency 5.1-5.3GHz 17.2-17.3GHz Topology decentralized ad- hoc/infrastructure cellular, centralized point-to- multipoint point-to-point Antenna omni-directional directional Range 50 m 50-100 m 5000 m 150 m QoS statistical ATM traffic classes (VBR, CBR, ABR, UBR) Mobility <10m/s stationary Interface conventional LAN ATM networks Data rate 23.5 Mbit/s >20 Mbit/s 155 Mbit/s Power conservation yes not necessary
  26. 26. Comparison Between 802.11 and HIPERLAN/2 802.11 802.11b 802.11a HiperLAN2 Spectrum (GHz) 2.4 2.4 5 5 Max PHY rate (Mbps) 2 11 54 54 Max data rate, layer 3 (Mbps) 1.2 5 32 32 MAC CS CSMA/CA Central resource control/TDMA/TDD Connectivity Conn.-less Conn.-less Conn.- less Conn.-oriented Multicast Yes Yes Yes Yes QoS PCF (Point Control Function) PCF PCF ATM/802.1p/RSVP/Diff Serv (full control) Frequency selection Frequency-hopping or DSSS DSSS Single carrier Single carrier with Dynamic Frequency Selection Authentication No No No NAI/IEEE address/X.509
  27. 27. Comparison Between 802.11 and HIPERLAN/2 802.11 802.11b 802.11a HiperLAN2 Encryption 40-bit RC4 40-bit RC4 40-bit RC4 DES, 3DES Handover support No No No To be specified by H2GF Fixed Network Support Ethernet Ethernet Ethernet Ethernet, IP, ATM, UMTS, FireWire (IEEE 1394), PPP Management 802.11 MIB 802.11 MIB 802.11 MIB HiperLAN/2 MIB Radio link quality control No No No Link adaptation
  28. 28. Failure Due to competition from IEEE 802.11, which was simpler to implement and made it faster to the market. No Support of packets and frames with different size, and detection of the data frame type to be sent. No proper Generation of the appropriate sequence of control messages.
  29. 29. Web References http://en.wikipedia.org/wiki/HiperLAN http://www.cwins.wpi.edu/wlans96/documents/wsh96_wil kinson.pdf http://www.wirelesscommunication.nl/reference/chaptr01 /wrlslans/hiperlan.htm http://www.comlab.hut.fi/opetus/Summer_School_2004/ material/HIPERLAN.pdf http://www.ustudy.in/node/1738
  30. 30. Company LOGO

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