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Providing differentiated service to TCP flows over bandwidth on demand geostationary satellite networks | IEEE Journals & Magazine | IEEE Xplore

Providing differentiated service to TCP flows over bandwidth on demand geostationary satellite networks

Publisher: IEEE

Abstract:

The elasticity of transmission control protocol (TCP) traffic complicates attempts to provide performance guarantees to TCP flows. The existence of different types of net...View more

Abstract:

The elasticity of transmission control protocol (TCP) traffic complicates attempts to provide performance guarantees to TCP flows. The existence of different types of networks and environments on the connections' paths only aggravates this problem. In this paper, simulation is the primary means for investigating the specific problem in the context of bandwidth on demand (BoD) geostationary satellite networks. Proposed transport-layer options and mechanisms for TCP performance enhancement, studied in the single connection case or without taking into account the media access control (MAC)-shared nature of the satellite link, are evaluated within a BoD-aware satellite simulation environment. Available capabilities at MAC layer, enabling the provision of differentiated service to TCP flows, are demonstrated and the conditions under which they perform efficiently are investigated. The BoD scheduling algorithm and the policy regarding spare capacity distribution are two MAC-layer mechanisms that appear to be complementary in this context; the former is effective at high levels of traffic load, whereas the latter drives the differentiation at low traffic load. When coupled with transport layer mechanisms they can form distinct bearer services over the satellite network that increase the differentiation robustness against the TCP bias against connections with long round-trip times. We also explore the use of analytical, fixed-point methods to predict the performance at transport level and link level. The applicability of the approach is mainly limited by the lack of analytical models accounting for prioritization mechanisms at the MAC layer and the nonuniform distribution of traffic load among satellite terminals.
Published in: IEEE Journal on Selected Areas in Communications ( Volume: 22, Issue: 2, February 2004)
Page(s): 333 - 347
Date of Publication: 06 February 2004

ISSN Information:

Publisher: IEEE

I. Introduction

The dominance of the Internet Protocol (IP) within data networks seems today to be clearer than ever before. The expectations in the late 1980s/early 1990s that asynchronous transfer mode (ATM) would be the future network protocol have not materialized. Internet applications constitute the overwhelming majority of data applications running over wired data networks; at the same time the penetration of IP in wireless networks is increasing, embracing different access technologies.

References

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