A low-complexity source encoding assisted multiple access protocol for voice/data integrated networks

  • Authors:

  • Andres Kwasinski;Mehdi Alasti;K. J. R. Liu;Nariman Farvardin

  • Affiliations:

  • Department of Electrical and Computer Engineering and The Institute for Systems Research, University of Maryland, College Park, MD;Department of Electrical and Computer Engineering and The Institute for Systems Research, University of Maryland, College Park, MD;Department of Electrical and Computer Engineering and The Institute for Systems Research, University of Maryland, College Park, MD;Department of Electrical and Computer Engineering and The Institute for Systems Research, University of Maryland, College Park, MD

  • Venue:
  • EURASIP Journal on Applied Signal Processing
  • Year:
  • 2005

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Abstract

We present and evaluate the performance of a reduced complexity variation to the source encoding assisted multiple access (SEAMA) protocol for integrating voice and data over a wireless network. This protocol, denoted as slow movable-boundary SEAMA (SMB-SEAMA), uses the same embedded and multistate voice encoder used in the original SEAMA protocol. However, in SMB-SEAMA, the movable voice/data boundary is not set based on the frame-by-frame bandwidth demand of the voice sub-system, but on the number of ongoing voice calls and the acceptable average distortion level. This results in a protocol that, at the network layer, is packet switched for both voice and data; however, from the data traffic point of view, the voice looks like circuit switched. Analytical results show that SMB-SEAMA is a very efficient MAC protocol and presents a model for analyzing the performance of queuing systems with a variable number of servers, each with a constant service time. Consequently, while reducing the refreshing rate of the movable boundary by three orders of magnitude, simulation results demonstrate that SMB-SEAMA does not significantly degrade the system performance (less than 8% reduction in throughput) and it still performs better than packet reservation multiple access (PRMA), the other known packet-switched scheme, which updates the boundary during every transmit frame.