Investigation of the block ACK scheme in wireless ad hoc networks: Research Articles

  • Authors:
  • Tianji Li;Qiang Ni;Yang Xiao

  • Affiliations:
  • Hamilton Institute, National University of Ireland at Maynooth, Co. Kildare, Ireland;Electr. & Comp. Eng., Brunel Univ., UB8 3PH, West London, U.K. (Qiang Ni is now with Electr. & Comp. Eng., Sch. of Eng. and Des., Brunel Univ., West London, UK. Part of his work was done while he ...;Department of Computer Science, University of Alabama, 101 Houser Hall, Box 870290, Tuscaloosa, AL35487-0290, U.S.A.

  • Venue:
  • Wireless Communications & Mobile Computing - Medium Access Control Protocols for Wireless Ad Hoc Networks
  • Year:
  • 2006

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Abstract

A Block Transmission and Acknowledgement (BTA) scheme, also called Block ACK, has been proposed in the IEEE 802.11e wireless local area networks (WLAN) specification to improve efficiency of the medium access control layer. The idea of the BTA scheme is to transmit multiple data frames followed by only one acknowledgement frame in a transmission block. In this paper, we present a theoretical model to evaluate the saturation throughput for the BTA scheme under error channel conditions in the ad hoc mode, validated with simulations. We show some advantages of BTA over the legacy MAC, and analyze how to select a proper number of frames for each transmission block. Results show that BTA is particularly effective in very high-speed wireless networks, and it is important that the number of frames in each block is negotiated before transmissions to provide better efficiency. Copyright © 2006 John Wiley & Sons, Ltd.