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A Medium Access Control Protocol for Real Time Video over High Latency Satellite Channels

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Abstract

We report the results of extensive simulation work on a new satellite medium access control (MAC) protocol for medium quality interactive video. This MAC protocol uses combined random access/demand assigned multiple access (RA/DAMA). The underlying multiple access physical layer is time division multiple access (TDMA). The RA/DAMA MAC seeks to adaptively minimize the delay of each network layer (nl) packet that arrives to the output queue by transmitting packets on either a collision free demand assigned channel or on a collision possible random access channel. Combined with this dual channel transmission method is a new technique for acquiring demand assigned bandwidth, called a packet flow rate metric (PFRM). This metric seeks to track the slow time behavior of video traffic, leading to a significant reduction in the amount of DAMA signaling. All simulations were conducted using SMACS, the Satellite Medium Access Control Simulator [4], a simulation tool built into ns-2.0 (network simulator version 2) [10]. This simulation tool allowed us to evaluate our MAC protocol using an actual 2 hour long video trace rather than a parametric video traffic generator. Our results show that if light packet loss is tolerable (less than 3%), then significantly lower delays and higher link utilization can be achieved.

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Authors and Affiliations

  1. University of California Los Angeles, Los Angeles, CA, 90095, USA

    Dennis Connors & Gregory J. Pottie

  2. Teledesic Corporation, Bellevue, WA, USA

    Bo Ryu

  3. HRL Laboratories LLC, Malibu, CA 90265, USA

    Son Dao

Authors
  1. Dennis Connors
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  2. Bo Ryu
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  3. Gregory J. Pottie
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  4. Son Dao
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Connors, D., Ryu, B., Pottie, G.J. et al. A Medium Access Control Protocol for Real Time Video over High Latency Satellite Channels. Mobile Networks and Applications 7, 9–20 (2002). https://doi.org/10.1023/A:1013297627486

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  • DOI: https://doi.org/10.1023/A:1013297627486

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