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Transport Protocols for Next-Generation Networks and Applications

機(jī)譯：下一代網(wǎng)絡(luò)和應(yīng)用程序的傳輸協(xié)議

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Today's Internet is very different from what it was intended to be forty years back. Its capacity has increased by orders of magnitude and the last mile access medium has transitioned from wired to wireless communication technologies. Yet the architecture of the Internet has not fundamentally changed, the same Internet protocol stack remains the vital core of the network. The assumptions made in the development of the Internet protocols were based on wired links and a limited set of applications. Most of these assumptions do not hold for the new types of applications running on wireless links.;The layered-siloed architecture of the Internet has maintained a high level of abstraction that made it possible to adapt to new link types (such as optical networks, WiFi, cellular, satellite, etc.) and support new applications (such as realtime multimedia communication and video streaming). As cellular and other wireles networks take their place as the ubiquitous link layers of the future, wireless resources will become scarcer than ever. On the software side of the world, it is crucial to make the best use of the available resources. Unfortunately, combining the new applications and link layers with the current architecture results in poor application performance and inefficient link layer management.;In this dissertation, we focus on the transport layer which provides the abstraction interface between the link and the application. We argue that a fresh look at the existing transport layer solutions is necessary to fully utilize the capabilities of emerging link-layer technologies and enhance the services provided to new types of applications. We present two solutions to address the interaction of the transport layer with both the link and application layers. Our first solution, Link-Coupled TCP, uses explicit cross-layer communication to allow applications to explicitly configure the desired trade-off between link utilization and queueing delay. By leveraging the architecture of emerging 5th Generation (5G) networks, it allows concurrent flows of applications with heterogeneous requirements to coexist without interfering with one another and without lowering the overall utilization of the wireless link. Our second solution, Application-Aware TCP, uses implicit cross-layer communication to identify the type of traffic generated by the application. It adjusts the congestion control parameters of the transport layer in order to optimize the user's quality of experience. Application-Aware TCP improves the performance of web browsing and adaptive video streaming when competing with bulk transfer traffic without negatively impacting bulk transfer traffic on the long run.;Evaluating new solutions in realistic scenarios requires reliable tools that cover the different components and layers of the network. Network emulation provides enough flexibility by implementing a fully contained software replica of one of the network layers which can be tuned to act like its real counterpart under different conditions. For the scope of our solutions, we focus on three components: the wireless devices, the physical RF medium, and the wired portion of the network. We propose a set of guidelines for performing reliable experiments using the existing network emulation tools in Linux. We also present a wireless network testbed for accurately and reliably emulating the physical RF medium.
機(jī)譯：今天的互聯(lián)網(wǎng)與40年前的互聯(lián)網(wǎng)有很大不同。它的容量增加了幾個(gè)數(shù)量級(jí)，最后一英里的訪問介質(zhì)已經(jīng)從有線通信技術(shù)過渡到無線通信技術(shù)。但是Internet的體系結(jié)構(gòu)并沒有根本改變，相同的Internet協(xié)議棧仍然是網(wǎng)絡(luò)的重要核心。 Internet協(xié)議開發(fā)中所做的假設(shè)基于有線鏈接和一組有限的應(yīng)用程序。這些假設(shè)中的大多數(shù)都不適用于在無線鏈路上運(yùn)行的新型應(yīng)用程序。Internet的分層隔離體系結(jié)構(gòu)保持了較高的抽象水平，從而可以適應(yīng)新的鏈路類型（例如光網(wǎng)絡(luò)， WiFi，蜂窩，衛(wèi)星等）并支持新的應(yīng)用程序（例如實(shí)時(shí)多媒體通信和視頻流）。隨著蜂窩網(wǎng)絡(luò)和其他無線網(wǎng)絡(luò)取代它們成為未來無處不在的鏈路層，無線資源將比以往任何時(shí)候都更加稀缺。在軟件方面，充分利用可用資源至關(guān)重要。不幸的是，將新的應(yīng)用程序和鏈路層與當(dāng)前體系結(jié)構(gòu)結(jié)合在一起會(huì)導(dǎo)致應(yīng)用程序性能差和鏈路層管理效率低下。本文主要研究傳輸層，它提供了鏈路和應(yīng)用程序之間的抽象接口。我們認(rèn)為，有必要重新審視現(xiàn)有的傳輸層解決方案，以充分利用新興鏈路層技術(shù)的功能并增強(qiáng)為新型應(yīng)用程序提供的服務(wù)。我們提出兩種解決方案，以解決傳輸層與鏈路層和應(yīng)用程序?qū)又g的交互。我們的第一個(gè)解決方案是鏈接耦合TCP，它使用顯式的跨層通信來允許應(yīng)用程序顯式配置鏈接利用率和排隊(duì)延遲之間的所需折衷。通過利用新興的第五代（5G）網(wǎng)絡(luò)的體系結(jié)構(gòu)，它可以使具有異構(gòu)需求的應(yīng)用程序并發(fā)流共存，而不會(huì)彼此干擾，也不會(huì)降低無線鏈路的整體利用率。我們的第二個(gè)解決方案是“應(yīng)用程序感知的TCP”，它使用隱式跨層通信來識(shí)別應(yīng)用程序生成的流量類型。它調(diào)整傳輸層的擁塞控制參數(shù)，以優(yōu)化用戶的體驗(yàn)質(zhì)量。當(dāng)與批量傳輸流量競爭時(shí)，具有應(yīng)用程序感知能力的TCP可以提高Web瀏覽和自適應(yīng)視頻流的性能，而從長遠(yuǎn)來看不會(huì)對(duì)批量傳輸流量產(chǎn)生負(fù)面影響。;在現(xiàn)實(shí)情況下評(píng)估新解決方案需要可靠的工具，這些工具必須涵蓋不同的組件和層次網(wǎng)絡(luò)。網(wǎng)絡(luò)仿真通過實(shí)現(xiàn)網(wǎng)絡(luò)層之一的完全包含的軟件副本來提供足夠的靈活性，這些副本可以調(diào)整為在不同條件下像其真實(shí)副本一樣工作。在我們的解決方案范圍內(nèi)，我們專注于三個(gè)組件：無線設(shè)備，物理RF介質(zhì)和網(wǎng)絡(luò)的有線部分。我們提出了一套指南，用于使用Linux中的現(xiàn)有網(wǎng)絡(luò)仿真工具執(zhí)行可靠的實(shí)驗(yàn)。我們還提供了一個(gè)無線網(wǎng)絡(luò)測試平臺(tái)，可以準(zhǔn)確，可靠地模擬物理RF介質(zhì)。

著錄項(xiàng)

  • 作者

    Beshay, Joseph D.;

  • 作者單位

    The University of Texas at Dallas.;

  • 授予單位 The University of Texas at Dallas.;
  • 學(xué)科 Computer science.
  • 學(xué)位 Ph.D.
  • 年度 2017
  • 頁碼 143 p.
  • 總頁數(shù) 143
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 康復(fù)醫(yī)學(xué);
  • 關(guān)鍵詞

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