What is HIPERLAN in Wireless Network?

April 8, 2018 Author: munishmishra04_3od47tgp
Print Friendly, PDF & Email

There has been a remarkable growth in the field of wireless communication standards. Wireless networks are becoming popular as they allow users, the ability to remain connected while on the move.  These wireless standards are characterized based on their range, maximum signal rate, number of channels, channel bandwidth, data protection, frequency band, Quality of Service (QoS) and applications.



Overview of HiperLan

HIPERLAN is a European (ETSI) standardization initiative for a HIgh PERformance wireless Local Area Network. Radio waves are used instead of a cable as a transmission medium to connect stations. Either, the radio transceiver is mounted to the movable station as an add-on and no base station has to be installed separately, or a base station is needed in addition per room. The stations may be moved during operation-pauses or even become mobile. The maximum data rate for the user depends on the distance of the communicating stations. With short distances (<50 m) and asynchronous transmission a data rate of 20 Mbit/s is achieved, with up to 800 m distance a data rate of 1 Mbit/s are provided. For connection-oriented services, e.g. video-telephony, at least 64 kbit/s are offered.

The standard serves to ensure the possible interoperability of different manufacturers’ wireless communications equipment that operate in this spectrum. The HIPERLAN standard only describes a common air interface including the physical layer for wireless communications equipment, while leaving decisions on higher level configurations and functions open to the equipment manufacturers.

Significance of HiperLan

The need for mobile broadband communications has increased rapidly in recent years placing new demands for the wireless local area networks (WLANs). These requirements include support for QoS, security, handover, and increased throughput. To answer these needs, the European Telecommunications Standards Institute (ETSI) is working on HIPERLAN (HIgh PERformance LAN) standards of various types. These standards merely describe the low-level interfaces and leave the higher level functions open. This essay will concentrate on HIPERLAN/2, a state-of-the-art WLAN technology that has been developed to provide a wireless access to fixed networks. This is intended to be a short overview of its main features and protocol reference model.

HIPERLAN is a European family of standards on digital high speed wireless communication in the 5.15-5.3 GHz and the 17.1-17.3 GHz spectrum developed by ETSI. The committee responsible for HIPERLAN is RES-10 which has been working on the standard since November 1991.

The standard serves to ensure the possible interoperability of different manufacturers’ wireless communications equipment that operate in this spectrum. The HIPERLAN standard only describes a common air interface including the physical layer for wireless communications equipment, while leaving decisions on higher level configurations and functions open to the equipment manufacturers.



HiperLAN 1 Reference Model

HiperLAN 1 defines Data Link Layer and Physical Layer. For Local Area Networks, Data Link Layer is further divided into two sublayers: the Logical Link Control (LLC) and the Medium Access Control (MAC). HiperLAN 1 only deals with MAC and PHY. An intermediate layer, the Channel Access and Control (CAC) sublayer, is introduced in the HiperLAN 1 architecture to deal with the channel access signaling and protocol operation required supporting packet priority.

Hiperlan Reference Model

Figure: HiperLan 1 Reference Model

Applications of HIPERLAN

The applications of HIPERLANs cover a wide range of business, administrative, and professional uses. The following list provides examples. As HIPERLAN technology becomes widely available other applications will emerge which will further increase HIPERLAN’s utilization.

  • Office automation: General office automation covers a wide range of administrative applications. Changes in office organization such as emphasis on work groups lead to demands for flexibility in the location of professional and support staff. In addition, the increased complexity of administrative and management tasks leads to frequent ad-hoc meetings at which people wish to make use of their computers.
  • Financial services: The financial industry is moving towards a more flexible and fast service specialized to meet individual needs. Untethered computing will provide for the realisation of financial products like flexible cash machines, home-banking directly with the user’s equipment and other ad-hoc services.
  • Medical and hospital systems: In all developed countries medical care and hospitalization are becoming more expensive. These extra costs are caused in part by the complexity of medical systems, patient care and medication. The efficiency of medical staff can be improved by giving them on the spot, real-time access, wherever they are, to patient data, x-ray images, video recordings and medical records.
  • Education and training: Computers and networks in particular are being used increasingly in education and training, both in schools and colleges, and in the workplace. HIPERLAN will greatly enhance the services that can be offered as well as the flexibility of their provision. These include the distribution of teaching material, interaction with teachers, sharing of assignments and research results, as well as printing and other services available on wired LANs. Wired systems cannot provide the flexibility needed in educational institutions.
  • Industrial automation: Industrial systems have been using computers for many years; in many cases the systems concerned were centralised where a few computers controlling a large number of machine tools, conveyor systems, etc. With the increasing use of microprocessor technology and with the trend towards flexible production systems, more computing power will be decentralized. This will be paralleled by an increased need for adhoc networking between production floor systems. Radio based networks are ideal for these applications, especially taking into account the ability of HIPERLAN to service moving objects




References

[1] “Radio Equipment and Systems (RES); High Performance Radio Local Area Network (HIPERLAN) Services and facilities”, ETSI Technical February Report, ETR 069, 1993

[2] “Definition of: HIPERLAN”, available online at: https://www.pcmag.com/encyclopedia/term/44280/hiperlan

[3] Janne Korhonen, “HIPERLAN/2”, available online at: http://www.tml.tkk.fi/Studies/Tik-110.300/1999/Essays/hiperlan2.html

[4] Torben Rune, “High Performance LAN (Hiperlan)”, Chapter: Network Concepts and Standards, JPL’s Wireless Communication Reference Website

[5] “Explain in detail HIPERLAN/1 physical layer”, available online at: http://www.ques10.com/p/19447/explain-in-detail-hiperlan1-physical-layer/

 

No Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Insert math as
Block
Inline
Additional settings
Formula color
Text color
#333333
Type math using LaTeX
Preview
\({}\)
Nothing to preview
Insert