UBR+: improving performance of TCP over ATM-UBR service

Goyal, Rohit; Jain, Raj; Kalyanaraman, S.; Fahmy, Sonia; Kim, S.-C.

doi:10.1109/icc.1997.610038

Cited by 53 publications

(40 citation statements)

References 6 publications

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“…The same issues have been studied earlier for persistent/infinite TCP traffic in [3]. Both studies establish that for long delay satellite links, end system policies are far more effective than switch policies in ensuring good performance.…”

Section: End-system Policy Vs Switch Policy For Satellite-atmmentioning

confidence: 66%

See 1 more Smart Citation

Broadband Satellite Network: TCP/IP Performance Analysis

Kota

Goyal

et al. 2000

Broadband Communications

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A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, as well as low earth orbit (LEO) constellations operating in the Ka-band and above. At these frequencies satellite networks are able to provide broadband services requiring wider bandwidth than the current services at C or Ku-band. As a consequence, some of the new services gaining momentum include mobile services, private intranets and high data rate internet access carried over integrated satellite-fiber ATM networks. Several performance issues need to be addressed before a transport layer protocol, like TCP can satisfactorily work over satellite ATM for large delay-bandwidth networks. In this paper, we discuss some of the architectural options and challenges for broadband satellite ATM networks.The performance results of TCP enhancements for Unspecified Bit Rate over ATM (ATM-UBR+) for large bandwidth-delay environments with various end system policies and drop policies for GEO satellite configurations for several buffer sizes are presented.

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Section: End-system Policy Vs Switch Policy For Satellite-atmmentioning

confidence: 66%

“…Partially received packets are accepted if possible. The Selective Drop policy [3] uses per-VC accounting, i.e., keeps track of current buffer utilisation of each active UBR VC. A UBR VC is called "active" if it has at least one cell currently buffered in the switch.…”

Section: Tcpiip Traffic Transport Over Satellite Atmmentioning

confidence: 99%

Broadband Satellite Network: TCP/IP Performance Analysis

Kota

Goyal

et al. 2000

Broadband Communications

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“…The bu!er management policies are tail drop, early packet, discard (EPD) [6], and selective drop (SD) [4]. We also discuss the e!ect of providing a minimum rate guarantee to the entire UBR service category.…”

Section: Problem 1 (Performance Analysis Of Tcp Over Satellite-ubr)mentioning

confidence: 99%

“…While bu!er management techniques provide clear performance improvements for TCP over terrestrial networks [4,7], it is not clear if their bene"ts are substantial over satellite networks that have larger propagation delays. Also, bu!er management mechanisms increase the complexity and hence the cost of designing on-board and ground-based network elements.…”

Section: Introductionmentioning

confidence: 99%

Buffer management and rate guarantees for TCP over satellite‐ATM networks

Goyal¹,

Jain²,

Goyal

et al. 2001

Int. J. Satell. Commun.

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SUMMARYFuture broadband satellite networks will support a variety of service types. Many such systems are being design with ATM or ATM-like technology. A majority of Internet applications use TCP for data transfer. As a result, these systems must e$ciently transport TCP tra$c and provide service guarantees to such tra$c. Several mechanisms have been presented in recent literature to improve TCP performance. Most of these can be categorized as either TCP enhancements or network-based bu!er management techniques. Providing minimum rate guarantees to TCP tra$c has also been suggested as a way to improve its performance in the presence of higher priority tra$c sharing the link. However, the relative performance of the TCP enhancements versus the bu!er management schemes has not been analyzed for long latency networks. In this paper, we address three issues. First, we present a performance analysis of TCP over satellite-ATM links using a best e!ort service*the ATM unspeci"ed bit rate (UBR) service. This analysis shows that the relative impacts of bu!er management, TCP policies and rate guarantees on TCP performance, depend heavily on the latency of the network. Second, we show through simulations that the bu!er size required in the network for high TCP performance is proportional to the delay-bandwidth product of the network. Third, we propose a bu!er management scheme called di!erential fair bu!er allocation (DFBA) and show how it is used to implement a service that provides minimum rate guarantees to TCP tra$c. An example of such a service is the ATM guaranteed frame rate (GFR) service, which is being standardized by the ATM Forum and the ITU.

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“…The problem is particularly noticeable in connections that utilize large congestion windows, since these connections are able to inject enough new segments into the network during recovery to trigger the multiple fast retransmits. Reducing cwnd multiple times for a single loss event may hurt performance [GJKFV98].…”

Section: Allman Et Al Best Current Practice [Page 10]mentioning

confidence: 99%

Enhancing TCP Over Satellite Channels using Standard Mechanisms

Allman¹,

Glover²,

Sánchez³

1999

263

170

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The Transmission Control Protocol (TCP) provides reliable delivery of data across any network path, including network paths containing satellite channels. While TCP works over satellite channels there are several IETF standardized mechanisms that enable TCP to more effectively utilize the available capacity of the network path. This document outlines some of these TCP mitigations. At this time, all mitigations discussed in this document are IETF standards track mechanisms (or are compliant with IETF standards).

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UBR+: improving performance of TCP over ATM-UBR service

Cited by 53 publications

References 6 publications

Broadband Satellite Network: TCP/IP Performance Analysis

Broadband Satellite Network: TCP/IP Performance Analysis

Buffer management and rate guarantees for TCP over satellite‐ATM networks

Enhancing TCP Over Satellite Channels using Standard Mechanisms

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