Buffer management and rate guarantees for TCP over satellite-ATM networks
Buffer management and rate guarantees for TCP over satellite-ATM networks
复制标题
卫星 ATM 网络上 TCP 的缓冲区管理和速率保证
DOI：
10.1002/sat.701
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. vonDeak
中科院分区：
文献类型：
--
作者：
R. Goyal;R. Jain;M. Goyal;S. Fahmy;B. Vandalore;S. Kota;N. Butts;T. vonDeak
未来的宽带卫星网络将支持各种服务类型。许多这样的系统是用ATM或类似ATM的技术设计的。大多数互联网应用程序使用TCP进行数据传输。因此，这些系统必须有效地传输TCP流量，并为这些流量提供服务保证。在最近的文献中已经提出了几种机制来提高TCP性能。其中大部分可以归类为TCP增强或基于网络的缓冲区管理技术。提供最低速率保证的TCP流量也被建议作为一种方式，以提高其性能的存在下，更高的优先级流量共享的链接。然而，TCP增强与缓冲区管理方案的相对性能还没有被分析为长延迟网络。在本文中，我们解决三个问题。首先，我们提出了一个性能分析的TCP在卫星ATM链路上使用的最佳努力服务的ATM未指定比特率（UBR）服务。分析表明，缓冲区管理、TCP策略和速率保证对TCP性能的相对影响在很大程度上取决于网络的延迟。其次，我们通过模拟表明，在网络中所需的高TCP性能的缓冲区大小是成比例的网络的延迟带宽产品。第三，我们提出了一个缓冲区管理计划，称为差分公平缓冲区分配（DFBA），并显示它是如何用来实现一个服务，提供最低速率保证TCP流量。这种业务的一个例子是ATM保证帧速率（GFR）业务，它正由ATM论坛和ITU标准化。版权所有© 2001约翰威利父子有限公司。
Future 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 efficiently transport TCP traffic and provide service guarantees to such traffic. 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 buffer management techniques. Providing minimum rate guarantees to TCP traffic has also been suggested as a way to improve its performance in the presence of higher priority traffic sharing the link. However, the relative performance of the TCP enhancements versus the buffer 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 effort service—the ATM unspecified bit rate (UBR) service. This analysis shows that the relative impacts of buffer management, TCP policies and rate guarantees on TCP performance, depend heavily on the latency of the network. Second, we show through simulations that the buffer size required in the network for high TCP performance is proportional to the delay-bandwidth product of the network. Third, we propose a buffer management scheme called differential fair buffer allocation (DFBA) and show how it is used to implement a service that provides minimum rate guarantees to TCP traffic. 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. Copyright © 2001 John Wiley & Sons, Ltd.