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This presentation has the details about the HIPERLAN information...

This presentation has the details about the HIPERLAN information...

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  • 1. HIPERLANHIgh PErformance Radio Local Area Networks
    www.ustudy.in
  • 2. Introduction
    • Roughly speaking there are two types of wireless networks:
    • 3. Local Area Networks (LAN)
    • 4. Bluetooth, 802.11 Family, HiperLAN Family, HomeRF...
    • 5. Wide Area Networks (WAN)
    • 6. GSM, 3G, 4G, Iridium...
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  • 7. Mobility and data rates for communications standards
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  • 8.
    • Two main standards families for Wireless Lan:
    • 9. IEEE 802.11 (802.11b, 802.11a, 802.11g...)
    • 10. ETSI HiperLAN (HiperLAN Type 1, Type 2, HiperAccess, HiperLink...)
    • 11. HiperLAN Family
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  • 12. Motivation of HiperLAN
    • Massive Growth in wireless and mobile communications
    • 13. Emergence of multimedia applications
    • 14. Demands for high-speed Internet access
    • 15. Deregulation of the telecommunications industry
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  • 16. The History, Present and Future
    • HiperLAN Type 1
    • 17. Developed by ETSI during 1991 to 1996
    • 18. Goal: to achieve higher data rate than IEEE 802.11 data rates: 1~2 Mbps, and to be used in ad hoc networking of portable devices
    • 19. Support asynchronous data transfer, carrier-sense multiple access multiple access with collision avoidance (CSMA/CA), no QoS guaranteed.
    • 20. Products
    • 21. Proxim's High Speed RangeLAN5 product family (24Mbps; 5GHz; QoS guaranteed)
    • 22. RadioLAN’s products for indoor wireless communication (10Mbps; 5GHz; Peer-to-Peer Topology)
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  • 23.
    • HiperLAN Type 2
    • 24. Next generation of HiperLAN family: Proposed by ETSI BRAN (Broadband Radio Access Networks) in 1999, and is still under development.
    • 25. Goal: Providing high-speed (raw bit rate ~54Mbps) communications access to different broadband core networks and moving terminals
    • 26. Features: connection-oriented, QoS guaranteed, security mechanism, highly flexibility
    • 27. Product: Prototypes are available now, and commercial products are expected at the end of 2001 (Ericsson).
    • 28. HiperAccess and HiperLink
    • 29. In parallel to developing the HIPERLAN Type 2 standards, ETSI BRAN has started work on standards complementary to HIPERLAN Type 2
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  • 30. Typical application scenarios
    • HiperLAN: A complement to present-day wireless access systems, giving high data rates to end-users in hot-spot areas.
    • 31. Typical app. Environment: Offices, homes, exhibition halls, airports, train stations, etc.
    • 32. Different with Bluetooth, which is mainly used for linking individual communication devices within the personal area network
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  • 33. www.ustudy.in
  • 34. II. Hiperlan2 System Overview
    Features
    • 5 GHz technology, up to 54 Mbit/s
    • 35. Generic architecture supporting:Ethernet, IEEE 1394, ATM, 3G etc.
    • 36. Connection-oriented with QoS per conn.
    • 37. Security - authentication & encryption
    • 38. Plug-and-play radio network using DFS
    • 39. Optimal throughput scheme
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  • 40. Architecture
    Control Plane
    User Plane
    CL
    MAC
    ACF
    DCC
    RRC
    EC
    CAC
    RLC
    MAC
    PHY
    DLC
    HiperLAN Type 1 Reference Model
    PHY
    HiperLAN Type 2 Reference Model
    MAC: Medium Access Sub layer EC: Error Control
    CAC: Channel Access Control Sub layer RLC: Radio Link Control
    PHY: Physical Layer RRC: Radio Resource Control
    DLC: Data Link Control Layer ACF: Association Control Function
    CL: Convergence Layer DCC: DLC Connection Control
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  • 41. Physical Layer
    • Data units on physical layer: Burst of variable length, consist of a preamble and a data field
    • 42. Reference configuration
    1: information bits
    2: scrambled bits
    3: encoded bits
    4: interleaved bits
    5: sub-carrier symbols
    6: complex baseband OFDM symbols
    7: PHY bursts
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  • 43.
    • Spectrum plays a crucial role in the deployment of WLAN
    • 44. Currently, most WLAN products operate in the unlicensed 2.4GHz band, which has several limitations: 80MHz bandwidth; spread spectrum technology; interference
    • 45. Spectrum allocation for Hiperlan2
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  • 46.
    • Modulation scheme: Orthogonal frequency-division multiplexing (OFDM)
    • 47. Robustness on highly dispersive channels of multipath fading and intersymbol interference
    • 48. Spectrally efficient
    • 49. Admits great flexibility for different modulation alternatives
    • 50. Facilitated by the efficiency of FFT and IFFT algorithms and DSP chips
    • 51. Hiperlan2: 19 channels (20MHz apart). Each channel divided into 52 subcarriers
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  • 52.
    • Encoding: Involves the serial sequencing of data, as well as FEC
    • 53. Key feature: Flexible transmission modes
    • 54. With different coding rates and modulation schemes
    • 55. Modes are selected by link adaptation
    • 56. BPSK, QPSK as well as 16QAM (64QAM) supported
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  • 57. Data Link Control Layer
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  • 58. Three main control functions
    • Association control function (ACF): authentication, key management, association, disassociation, encryption
    • 59. Radio resource control function (RRC): handover, dynamic frequency selection, mobile terminal alive/absent, power saving, power control
    • 60. DLC user connection control function (DCC): setup and release of user connections, multicast and broadcast
    Connection-oriented
    • After completing association, a mobile terminal may request one or several DLC connections, with one unique DLC address corresponding to each DLC connection, thus providing different QoS for each connection
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  • 61. DLC: MAC Sub layer
    • Basic frame structure (one-sector antenna)
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  • 62.
    • BCH (broadcast channel): enables control of radio resources
    • 63. FCH (frequency channel): exact description of the allocation of resources within the current MAC frame
    • 64. ACH (access feedback channel): conveys information on previous attempts at random access
    • 65. Multibeam antennas (sectors) up to 8 beams supported
    • 66. A connection-oriented approach, QoS guaranteed
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  • 67. HiperLAN implements QoS through time slots
    • QoS parameters: bandwidth, bit error rate, latency, and jitter
    • 68. The original request by a MT to send data uses specific time slots that are allocated for random access.
    • 69. AP grants access by allocating specific time slots for a specific duration in transport channels. The MT then sends data without interruption from other MT operating on that frequency.
    • 70. A control channel provides feedback to the sender.
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  • 71. DLC: Error Control
    • Acknowledged mode: selective-repeat ARQ
    • 72. Repetition mode: typically used for broadcast
    • 73. Unacknowledged mode: unreliable, low latency
    DLC: other features
    • Radio network functions: Dynamic frequency selection; handover; link adaptation; Multibeam antennas; power control
    • 74. QoS support: Appropriate error control mode selected; Scheduling performed at MAC level; link adaptation; internal functions (admission, congestion control, and dropping mechanisms) for avoiding overload
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  • 75. IV. Conclusion
    • Will HiperLAN standards replace 802.11?
    • 76. There will be a fight between connection and connectionless camps Hiperlan2/802.11a
    • 77. Current products under development and becoming available only offer 25Mbps
    • 78. Hiperlink 155Mbps data rates still some way off
    • 79. Wireless: Useful as an adjunct to the wired world
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  • 80. The End
    …… Thank You ……
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