Impact of CF-DAMA on TCP via satellite performance

Neale, J.; Mohsen, A.-K.

doi:10.1109/glocom.2001.966262

Cited by 13 publications

(10 citation statements)

References 5 publications

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“…The DVB-RCS standard defines the following three types of capacity request, from highest to lowest priority (we obviate the free capacity assignment (FCA) [18], which may be granted by the NCC, but not requested).…”

Section: Dynamic Bandwidth Allocation In the Dvb-rcsmentioning

confidence: 99%

“…Although a heavily loaded system with more traffic demands than system resources is assumed throughout the paper, this is not the only possible situation in systems using DVB-RCS. Indeed, if capacity exceeds the requests, then the problem is to assign the free capacity among the users [18]. The basics of the presented algorithms are still useful in that case with some redefinition of the variables.…”

Section: Free Capacity Assignmentmentioning

confidence: 99%

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Cross-Layer Design of Dynamic Bandwidth Allocation in DVB-RCS

Morell

Vázquez-Castro

2008

IEEE Systems Journal

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In this paper, a novel cross-layer framework for optimizing the dynamic bandwidth allocation (DBA) of a digital video broadcast (DVB)-return channel satellite (RCS) system using adaptive coding is proposed. The design of the medium access control (MAC) methods taking into account the adaptive physical layer and higher layers' quality of service (QoS) requirements is cast as an optimization problem by using the network utility maximization (NUM) framework applied within the satellite subnetwork. Hierarchical and global solving procedures fully compliant with the DVB-RCS standard are proposed. They do not only provide minimum bandwidth guarantees but also maximize fairness. Further, they allow a joint optimization of the time slot size and overall system efficiency while minimizing signalling overhead. A reduced computational complexity algorithm to solve the DBA problem is presented. In practical terms, it increases the number of connections with absolute and relative QoS requirements the system can manage and facilitates the interoperability of the satellite network within an Internet protocol (IP) environment. Index Terms-Cross layer, digital video broadcast (DVB)-return channel satellite (RCS), dynamic bandwidth allocation (DBA), optimization algorithms, satellite communications. I. INTRODUCTION A S INTERNET traffic continues to grow, satellite systems need to move from fixed bandwidth services (such as voice and video broadcasting) to dynamic bandwidth Internet Protocol (IP)-based services. Moreover, recent years have seen increasing interest in delivering IP-based multimedia applications requiring broadband support [1]. The digital video broadcasting-satellite (DVB-S) [2] is a widely accepted standard in the forward link of broadband satellite communications. The second generation (DVB-S2) [3] includes the transmission of multimedia contents and a variety of unicast and multicast services. In that context, a satellite terminal is intended to offer a huge package of services to the end-user. These wide system possibilities of DVB-S2 need interactivity and thus, a return link over the satellite is mandatory (a terrestrial return link would limit the expansion of DVB-S2 to certain areas). The current counterpart of DVB-S2 for the return link is the DVB-return channel satellite (RCS) standard [4], [5]. This paper focuses on unicast services for which adaptive coding and Manuscript

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Section: Dynamic Bandwidth Allocation In the Dvb-rcsmentioning

confidence: 99%

Section: Free Capacity Assignmentmentioning

confidence: 99%

Cross-Layer Design of Dynamic Bandwidth Allocation in DVB-RCS

Morell

Vázquez-Castro

2008

IEEE Systems Journal

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“…The effects of delay variation on transport protocols have been discussed in a previous section. As an example, the channel allocation delay can trigger spurious TCP timeouts [55]. In addition, the increased delay due to on-demand resource allocation translates to increased delay to the user.…”

Section: Effect On Transport Protocolsmentioning

confidence: 99%

Modeling wireless links for transport protocols

Gurtov

Floyd²

2004

SIGCOMM Comput. Commun. Rev.

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Wireless links have intrinsic characteristics that affect the performance of transport protocols; these include variable bandwidth, corruption, channel allocation delays, and asymmetry. In this paper we review simulation models for cellular, WLAN and satellite links used in the design of transport protocols, and consider the interplay between wireless links and transport. We argue that the design and evaluation of transport protocols can be improved by providing easily available models of wireless links that strike a balance between realism, generality, and detail.There is an ongoing tussle between wireless link design and transport protocol design, with papers about how wireless link designers should take into account the dynamics of TCP, and other papers about how TCP and other transport protocols can be designed or modified for better performance over current wireless link technologies. In this paper we consider how appropriate models for wireless links can help in this tussle, and in the general design and evaluation of transport protocols over wireless links 1 .

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Section: Tcp and Bod Interactionmentioning

confidence: 99%

“…The interaction of TCP with BoD mechanisms in the context of DVB-RCS networks is discussed in [14] and [15], using simplistic approximations for the resource allocation procedures described in the standard [1]. The authors in [14] consider a single TCP connection, while they model the volumebased dynamic capacity (VBDC) allocation and FCA modes of DVB-RCS are modeled as independent processes: return link slots become available to the terminal either deterministically (periodically) or following some authoritative distribution (exponential or uniform). In [15], it is the BoD-related delay (access delay) that is independently modeled: the access delays related to different DVB-RCS capacity allocation modes are one of the inputs to the simulation, i.e., chosen a priori irrespective of the link capacity and the number of connections that share the link.…”

Section: Tcp and Bod Interactionmentioning

confidence: 99%

Providing Differentiated Service to TCP Flows Over Bandwidth on Demand Geostationary Satellite Networks

Karaliopoulos

Tafazolli

Evans

2004

IEEE J. Select. Areas Commun.

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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.Index Terms-Bandwidth on demand (BoD), fixed point, geosynchronous earth orbit (GEO) satellite networks, media access control (MAC), split connections, transmission control protocol (TCP).

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Impact of CF-DAMA on TCP via satellite performance

Cited by 13 publications

References 5 publications

Cross-Layer Design of Dynamic Bandwidth Allocation in DVB-RCS

Cross-Layer Design of Dynamic Bandwidth Allocation in DVB-RCS

Modeling wireless links for transport protocols

Providing Differentiated Service to TCP Flows Over Bandwidth on Demand Geostationary Satellite Networks

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