Throughput Analysis of a Cooperative ARQ Scheme in the Presence of Hidden and Exposed Terminals

Authors:
Jesus Alonso-Zarate;Luis Alonso;Georgios Kormentzas;R. Tafazolli;Christos Verikoukis
Affiliations:
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Barcelona, Spain 08860;Department of Signal Theory and Comms., Universitat Politècnica de Catalunya (UPC), Barcelona, Spain 08860;Department of Information and Communication Systems Engineering, University of the Aegean, Karlovasi, Greece 83200;Centre for Communication Systems Research, University of Surrey, Guildford, UK;Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Barcelona, Spain 08860
Venue:
Mobile Networks and Applications
Year:
2012

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Abstract

Cooperative Automatic Retransmission Request (C-ARQ) schemes exploit the broadcast nature of the radio channel by allowing those users which overhear a transmission to act as spontaneous relays when a packet has been received with errors at destination. Transmission takes place in two phases. First, the source transmits to the destination. In the case of error, retransmissions are then executed by the relays, providing the system with cooperative diversity. In this paper we analyze how the addition of these relays to the communication modifies the well-known hidden and exposed terminal problems associated to any medium access control protocol based on carrier sensing. This work is focused on Carrier Sensing Multiple Access (CSMA) protocols, such as the one defined in the IEEE 802.11 Standard. The theoretical study presented in this paper has been supported by computer-based simulations.