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  1. 1. HIPERLANHIgh PErformance Radio Local Area Networks<br /><br />
  2. 2. Introduction<br /><ul><li>Roughly speaking there are two types of wireless networks:
  3. 3. Local Area Networks (LAN)
  4. 4. Bluetooth, 802.11 Family, HiperLAN Family, HomeRF...
  5. 5. Wide Area Networks (WAN)
  6. 6. GSM, 3G, 4G, Iridium...</li></ul><br />
  7. 7. Mobility and data rates for communications standards<br /><br />
  8. 8. <ul><li>Two main standards families for Wireless Lan:
  9. 9. IEEE 802.11 (802.11b, 802.11a, 802.11g...)
  10. 10. ETSI HiperLAN (HiperLAN Type 1, Type 2, HiperAccess, HiperLink...)
  11. 11. HiperLAN Family</li></ul><br />
  12. 12. Motivation of HiperLAN <br /><ul><li> Massive Growth in wireless and mobile communications
  13. 13. Emergence of multimedia applications
  14. 14. Demands for high-speed Internet access
  15. 15. Deregulation of the telecommunications industry</li></ul><br />
  16. 16. The History, Present and Future <br /><ul><li>HiperLAN Type 1
  17. 17. Developed by ETSI during 1991 to 1996
  18. 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. 19. Support asynchronous data transfer, carrier-sense multiple access multiple access with collision avoidance (CSMA/CA), no QoS guaranteed.
  20. 20. Products
  21. 21. Proxim's High Speed RangeLAN5 product family (24Mbps; 5GHz; QoS guaranteed)
  22. 22. RadioLAN’s products for indoor wireless communication (10Mbps; 5GHz; Peer-to-Peer Topology)</li></ul><br />
  23. 23. <ul><li>HiperLAN Type 2
  24. 24. Next generation of HiperLAN family: Proposed by ETSI BRAN (Broadband Radio Access Networks) in 1999, and is still under development.
  25. 25. Goal: Providing high-speed (raw bit rate ~54Mbps) communications access to different broadband core networks and moving terminals
  26. 26. Features: connection-oriented, QoS guaranteed, security mechanism, highly flexibility
  27. 27. Product: Prototypes are available now, and commercial products are expected at the end of 2001 (Ericsson).
  28. 28. HiperAccess and HiperLink
  29. 29. In parallel to developing the HIPERLAN Type 2 standards, ETSI BRAN has started work on standards complementary to HIPERLAN Type 2</li></ul><br />
  30. 30. Typical application scenarios<br /><ul><li>HiperLAN: A complement to present-day wireless access systems, giving high data rates to end-users in hot-spot areas.
  31. 31. Typical app. Environment: Offices, homes, exhibition halls, airports, train stations, etc.
  32. 32. Different with Bluetooth, which is mainly used for linking individual communication devices within the personal area network</li></ul><br />
  33. 33.<br />
  34. 34. II. Hiperlan2 System Overview<br />Features<br /><ul><li>5 GHz technology, up to 54 Mbit/s
  35. 35. Generic architecture supporting:Ethernet, IEEE 1394, ATM, 3G etc.
  36. 36. Connection-oriented with QoS per conn.
  37. 37. Security - authentication & encryption
  38. 38. Plug-and-play radio network using DFS
  39. 39. Optimal throughput scheme</li></ul><br />
  40. 40. Architecture<br />Control Plane<br />User Plane<br />CL<br />MAC<br />ACF<br />DCC<br />RRC<br />EC<br />CAC<br />RLC<br />MAC<br />PHY<br />DLC<br />HiperLAN Type 1 Reference Model<br />PHY<br />HiperLAN Type 2 Reference Model<br />MAC: Medium Access Sub layer EC: Error Control<br />CAC: Channel Access Control Sub layer RLC: Radio Link Control<br />PHY: Physical Layer RRC: Radio Resource Control<br />DLC: Data Link Control Layer ACF: Association Control Function<br />CL: Convergence Layer DCC: DLC Connection Control<br /><br />
  41. 41. Physical Layer<br /><ul><li>Data units on physical layer: Burst of variable length, consist of a preamble and a data field
  42. 42. Reference configuration</li></ul>1: information bits<br />2: scrambled bits<br />3: encoded bits<br />4: interleaved bits<br />5: sub-carrier symbols<br />6: complex baseband OFDM symbols<br />7: PHY bursts<br /><br />
  43. 43. <ul><li>Spectrum plays a crucial role in the deployment of WLAN
  44. 44. Currently, most WLAN products operate in the unlicensed 2.4GHz band, which has several limitations: 80MHz bandwidth; spread spectrum technology; interference
  45. 45. Spectrum allocation for Hiperlan2</li></ul><br />
  46. 46. <ul><li>Modulation scheme: Orthogonal frequency-division multiplexing (OFDM)
  47. 47. Robustness on highly dispersive channels of multipath fading and intersymbol interference
  48. 48. Spectrally efficient
  49. 49. Admits great flexibility for different modulation alternatives
  50. 50. Facilitated by the efficiency of FFT and IFFT algorithms and DSP chips
  51. 51. Hiperlan2: 19 channels (20MHz apart). Each channel divided into 52 subcarriers</li></ul><br />
  52. 52. <ul><li>Encoding: Involves the serial sequencing of data, as well as FEC
  53. 53. Key feature: Flexible transmission modes
  54. 54. With different coding rates and modulation schemes
  55. 55. Modes are selected by link adaptation
  56. 56. BPSK, QPSK as well as 16QAM (64QAM) supported</li></ul><br />
  57. 57. Data Link Control Layer<br /><br />
  58. 58. Three main control functions<br /><ul><li>Association control function (ACF): authentication, key management, association, disassociation, encryption
  59. 59. Radio resource control function (RRC): handover, dynamic frequency selection, mobile terminal alive/absent, power saving, power control
  60. 60. DLC user connection control function (DCC): setup and release of user connections, multicast and broadcast</li></ul>Connection-oriented<br /><ul><li>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</li></ul><br />
  61. 61. DLC: MAC Sub layer<br /><ul><li>Basic frame structure (one-sector antenna)</li></ul><br />
  62. 62. <ul><li>BCH (broadcast channel): enables control of radio resources
  63. 63. FCH (frequency channel): exact description of the allocation of resources within the current MAC frame
  64. 64. ACH (access feedback channel): conveys information on previous attempts at random access
  65. 65. Multibeam antennas (sectors) up to 8 beams supported
  66. 66. A connection-oriented approach, QoS guaranteed</li></ul><br />
  67. 67. HiperLAN implements QoS through time slots<br /><ul><li>QoS parameters: bandwidth, bit error rate, latency, and jitter
  68. 68. The original request by a MT to send data uses specific time slots that are allocated for random access.
  69. 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. 70. A control channel provides feedback to the sender.</li></ul><br />
  71. 71. DLC: Error Control<br /><ul><li>Acknowledged mode: selective-repeat ARQ
  72. 72. Repetition mode: typically used for broadcast
  73. 73. Unacknowledged mode: unreliable, low latency</li></ul>DLC: other features<br /><ul><li>Radio network functions: Dynamic frequency selection; handover; link adaptation; Multibeam antennas; power control
  74. 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</li></ul><br />
  75. 75. IV. Conclusion<br /><ul><li>Will HiperLAN standards replace 802.11?
  76. 76. There will be a fight between connection and connectionless camps Hiperlan2/802.11a
  77. 77. Current products under development and becoming available only offer 25Mbps
  78. 78. Hiperlink 155Mbps data rates still some way off
  79. 79. Wireless: Useful as an adjunct to the wired world</li></ul><br />
  80. 80. The End<br /> …… Thank You ……<br /><br />