Modelling ARQ for a high-speed wireless ATM based LAN

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Modelling ARQ for a high-speed wireless ATM based LAN

Technische Universiteit Eindhoven
  • Mobile Telecommunication
  • Electrical Engineering: Report Series
  • Radio Transmission (General). Antenna Theory
  • Digital Communications. Pulse-Code Modulation
  • Broadband Communication
  • Local Telecommunication
  • Data Transmission - Radiocommunication
  • Telecommunication - Traffic Theory


rUle technische universiteit eindhoven Faculty of Electrical Engineering Section of Telecommunication Technology and Electromagnetics Master's Thesis: Modelling ARQ for a high-speed wireless ATM based LAN M.F.R. de Gier Coaches: dr. ir. P.F.M. Smulders, ir. D. van de Meulenhof Supervisor: prof. dr. ir. G. Brussaard The faculty of Electrical Engineering of Eindhoven University of Technology does not accept any responsibility regarding the contents of Master's Theses Abstract There is an increasing tendency visible in the use of the Asynchronous Transfer Mode (ATM) for broadband networks. Originally intended for the use in fixed networks, due to the increase in user mobility, large research efforts are made in investigating the use of ATM for wireless broadband networks. In the Advanced Services and telecommunications project MEDIAN an ATM based high- speed wireless Local Area Network (LAN) at 60 GHz with a 150 Mbitls capacity is investigated. A demonstrator has been built to show the possibilities of a wireless broadband local environment. However, the functionality of this demonstrator is still limited. To add functionality, without immediately implementing it a simulation model of a wireless LAN, based on the demonstrator, has been developed. To ensure reliable communication, a Forward Error Correction (FEC) scheme is used leading to reasonable Cell Loss Ratios (CLR) on the wireless link. To improve the CLR, a retransmission scheme, or Automatic Repeat requested (ARQ) is proposed, to be used on top of the FEe. To enable the use of ARQ, sequence numbers are attached to the ATM cells, in order to uniquely identifY each cell on the wireless link. Also, a 'Sequence Number confirmed' is added to the ATM cell to acknowledge cells going in the opposite direction. A special ACK PDU, containing a number of acknowledgements is necessary in case the traffic is unbalanced. To ensure a fast response, retransmissions are given priority over normal transmissions and requests for retra

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