Abstract
HDLC is an internationally accepted link control protocol which has been accepted for terrestrial links. When applied to satellite links, however, HDLC has two major deficiencies:
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1.
Blocking due to window size limitations.
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2.
Throughput degradation due to the fact that at most one reject may be outstanding at a given time.
Both problems arise as a consequence of the very long signal propagation delay of satellite links.
In this paper we describe a model for the error behaviour of satellite links with special emphasis on bursty errors. This model is used to explain the unsatisfactorily behaviour of HDLC for satellite links.
Following that, several methods for overcoming these problems are discussed. A new concept (“Virtual Subchannels”) is presented which eliminates the HDLC-deficiencies by means of a two-level hierarchy of link protocols. The lower level (“Subchannel Level”) operates exactly according to HDLC; the second level (“Total System”) is a superposition of several independent subchannels together with a frame reordering scheme and a flow control rule for the total system.
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References
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O. SPANIOL:Performance Evaluation of the Virtual Subchannel Protocol for Satellite Link Communication. (To be presented at the URSI conference, august 10–19, 1981, Washington D.C.)
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© 1981 Springer-Verlag Berlin Heidelberg
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Pujolle, G., Spaniol, O. (1981). The Virtual Subchannel Protocol for Satellite Link Communications. In: Schindler, S., Schröder, J.C.W. (eds) Kommunikation in verteilten Systemen. Informatik-Fachberichte, vol 40. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67978-0_13
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DOI: https://doi.org/10.1007/978-3-642-67978-0_13
Publisher Name: Springer, Berlin, Heidelberg
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