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HIPER LAN (High Performance Radio LAN). Two main standards families for Wireless Lan: IEEE 802.11 (802.11b, 802.11a, 802.11g...) ETSI Hiperlan (Hiperlan Type 1, Type 2, HiperAccess, HiperLink...) HiperLAN Family. Motivation of HiperLAN Massive Growth in wireless and mobile communications

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HIPER LAN (High Performance Radio LAN)

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Hiper lan high performance radio lan

HIPER LAN(High Performance Radio LAN)


Hiper lan high performance radio lan

  • Two main standards families for Wireless Lan:

    • IEEE 802.11 (802.11b, 802.11a, 802.11g...)

    • ETSI Hiperlan (Hiperlan Type 1, Type 2, HiperAccess, HiperLink...)

  • HiperLAN Family


Hiper lan high performance radio lan

  • Motivation of HiperLAN

    • Massive Growth in wireless and mobile communications

    • Emergence of multimedia applications

    • Demands for high-speed Internet access

    • Deregulation of the telecommunications industry


Hiper lan high performance radio lan

  • The History, Present and Future

    • HiperLAN Type 1

      • Developed by ETSI during 1991 to 1996

      • 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

      • Support asynchronous data transfer, carrier-sense multiple access multiple access with collision avoidance (CSMA/CA), no QoS guaranteed.


Hiper lan high performance radio lan

  • HiperLAN Type 2

    • Goal: Providing high-speed (raw bit rate ~54Mbps) communications access to different broadband core networks and moving terminals

    • Features: connection-oriented, QoS guaranteed, security mechanism, highly flexibility

  • HiperAccess and HiperLink

    • In parallel to developing the HIPERLAN Type 2 standards, ETSI BRAN has started work on standards complementary to HIPERLAN Type 2


Hiper lan high performance radio lan

  • Architecture

Control Plane

User Plane

CL

MAC

RRC

ACF

DCC

EC

CAC

RLC

MAC

PHY

DLC

HiperLAN Type 1 Reference Model

PHY

HiperLAN Type 2 Reference Model

MAC: Medium Access SublayerEC: Error Control

CAC: Channel Access Control SublayerRLC: Radio Link Control

PHY: Physical LayerRRC: Radio Resource Control

DLC: Data Link Control LayerACF: Association Control Function

CL: Convergence LayerDCC: DLC Connection Control


Cac channel access control sublayer

CAC: Channel Access Control Sublayer

  • This sub layer deals with the access request to the channels.

  • The accomplishing of the request is dependent on the usage of the channel and the priority request.


Hiperlan2 protocol stack

HIPERLAN2 Protocol Stack


Hiper lan high performance radio lan

  • DLC: MAC Sublayer

  • The medium access control creates frames of 2 ms duration as shown in Figure. With a constant symbol length of four μs this results in 500 OFDM symbols.


Hiper lan high performance radio lan

Each MAC frame is further sub-divided into four phases with variable boundaries:

Broadcast phase: The AP of a cell broadcasts the content of the current frame plus information about the cell (identification, status, resources).

Downlink phase: Transmission of user data from an AP to the MTs.

Uplink phase: Transmission of user data from MTs to an AP.

Random access phase: Capacity requests from already registered MTs and access requests from non-registered MTs.


Hiper lan high performance radio lan

HiperLAN2 defines six different so-called transport channels for data transfer in the above listed phases. These transport channels describe the basic message format within a MAC frame.

  • Broadcast channel (BCH): This channel conveys basic information for the radio cell to all MTs. This comprises the identification and current transmission power of the AP. The length is 15 bytes.

  • Frame channel (FCH): This channel contains a directory of the downlink and uplink phases (LCHs, SCHs, and empty parts). This also comprises the PHY mode used. The length is a multiple of 27 bytes.


Hiper lan high performance radio lan

  • Access feedback channel (ACH): This channel gives feedback to MTs regarding the random access during the RCH of the previous frame. The length is 9 bytes.

  • Long transport channel (LCH): This channel transports user and control data for downlinks and uplinks. The length is 54 bytes.

  • Short transport channel (SCH): This channel transports control data for downlinks and uplinks. The length is 9 bytes.

  • Random channel (RCH): This channel is needed to give an MT the opportunity to send information to the AP/CC even without a granted SCH. The length is 9 bytes.


Hiper lan high performance radio lan

  • DLC: Error Control

    • Acknowledged mode: selective-repeat ARQ

    • Repetition mode: typically used for broadcast

    • Unacknowledged mode: unreliable, low latency

  • DLC: other features

    • Radio network functions: Dynamic frequency selection; handover; link adaptation; multibeam antennas; power control

    • 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


Radio link control sublayer

Radio Link Control Sublayer

  • It offers connection oriented systems ,offering QoS.

  • Three main control functions

    • Association control function (ACF): authentication, key management, association, disassociation, encryption

    • Radio resource control function (RRC): handover, dynamic frequency selection, mobile terminal alive/absent, power saving, power control

    • DLC user connection control function (DCC): setup and release of user connections, multicast and broadcast


Convergence layer

Convergence Layer

HiperLAN2 supports two different types of CLs: cell-based and packet-based.

cell-based CL expects data packets of fixed size (cells, e.g., ATM cells).

packet-based CL handles packets that are variable in size (e.g., Ethernet )


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