Resource Management for Broadband Satellite Networks

宽带卫星网络的资源管理

• 批准号: 0087266
• 负责人: Catherine Rosenberg
• 金额: $ 12.97万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0087266&HistoricalAwards=false
• 关键词: Resource; Management; Broadband; Satellite; Networks

Broadband satellite systems have an important role to play in the delivery of multimedia applications.In this proposal we concentrate on GEO (geo-synchronous) based satellite networks. GEO based systemsdeliver continuous services to a specific region with a single satellite. They play an ever-increasing role inthe public and private Internets, due mostly to their large geographic coverage, inherent broadcastcapabilities and fast deployment. They are attractive to support data, audio and video streaming; bulk datatransfer such as software updates or dissemination of Web caches; and applications involving limitedinteractivity such as distance learning. They are also attractive to provide broadband access to users who areeither beyond the reach of the terrestrial network, or have particular needs for broadcast/multicastapplications or fast deployment. We will focus in this proposal on Next Generation Satellite Networks that comprise one (or more) GEOsatellite with some form of onboard processing (OBP). Two of the essential issues regarding broadbandsatellite network are 1) end-to-end resource management, and 2) network availability. Resource management is key to deliver acceptable Quality of Service (QoS) to services while providingadequate efficiency. It is central to any satellite system, be it a bent pipe or an onboard processing (OBP)satellite system. Indeed, in order to offer flexibility and efficiency to bursty applications, the capacity of themultiple access uplink has to be managed using some bandwidth on demand (BoD) scheme. We define network availability as the ability for the network to offer some level of services to someapplications even during degraded periods. Most of the next generation systems will be using the Ka band,which is known for its very difficult transmission characteristics. Many solutions involving variable ratecoding, power control, and/or variable modulation have been proposed to make this band friendly tobroadband applications. This proposal will not study directly those layer 1/2 mechanisms but rather studyhow their use affects BoD and more generally end-to-end resource management. Hence the final objective of our proposal is to design and evaluate end-to-end resource managementfor the Next Generation of Satellite Networks that interworks efficiently with the range of solutionsproposed by the air-interface designer to improve the availability of the transmission. In particular, wewant to understand the trade-off in terms of efficiency and system complexity. To achieve this ultimate objective, we will study:1. Static end-to-end resource management for large GEO OBP systems. The term static refers to thefact that the coding and modulation are fixed. The focus here will be to develop and evaluatemechanisms that are scalable, robust, flexible and protect the OBP (i.e., the switch in the sky). Wewill build upon our extensive previous work in the domain where we developed scalable, robust,flexible end-to-end resource management for large GEO bent pipe systems.2. Network availability. One of the main concerns of satellite network designers is to offer an"appropriate" level of service to the users in spite of the difficult characteristics of the frequencyband. However it is not very clear what is meant by "an appropriate level of service" since it mayvary from a user to another or from an application to another. Most of the studies have focussed onlink availability without taking into account the networking and applications aspects. We believethat coordinating the lower layers with the upper layers will give us a flexible and cost-efficientsolution allowing the system to deliver different levels of network availability to the usersdepending on their need and their willingness to pay. Hence network availability can be seen as aQoS requirement and should be defined and studied that way.3. Designing end-to-end resource management for a system comprising layer 1/2 mechanisms todynamically improve the uplink availability so as to offer flexible and cost efficient services to theusers. We need to propose solutions and to evaluate them to ensure that the increase in complexityis worthwhile in terms of efficiency. We will also propose and study some dynamic pricing schemesintegrated with the BoD so as to allow the users to indicate their willingness to pay for capacity in acontext where the total available capacity is variable due to link impairment.

宽带卫星系统在提供多媒体应用方面发挥着重要作用，在本提案中，我们集中讨论基于地球同步轨道的卫星网络。基于地球同步轨道的系统用一颗卫星向特定区域提供连续服务。它们在公共和私人互联网中发挥着越来越重要的作用，主要是由于它们的大地理覆盖范围，固有的广播能力和快速部署。它们的吸引力在于支持数据、音频和视频流;批量数据传输，如软件更新或网络缓存的传播;以及涉及有限交互性的应用，如远程学习。它们还具有吸引力，可以为地面网络无法覆盖的用户或对广播/组播应用或快速部署有特殊需求的用户提供宽带接入。 我们将把重点放在下一代卫星网络，包括一个（或多个）地球同步卫星与某种形式的机载处理（OBP）的建议。宽带卫星网络的两个基本问题是1）端到端的资源管理和2）网络可用性。 资源管理是在提供足够的效率的同时为服务提供可接受的服务质量（QoS）的关键。它是任何卫星系统的核心，无论是弯管还是机载处理（OBP）卫星系统。事实上，为了给突发应用提供灵活性和效率，必须使用一些带宽按需（BoD）方案来管理多址上行链路的容量。 我们将网络可用性定义为网络即使在降级期间也能为某些应用程序提供某种级别的服务的能力。大多数下一代系统将使用Ka波段，这是众所周知的非常困难的传输特性。已经提出了许多涉及可变速率编码、功率控制和/或可变调制的解决方案，以使该频带对宽带应用友好。本提案将不直接研究这些1/2层机制，而是研究它们的使用如何影响BOD以及更普遍的端到端资源管理。 因此，我们的建议的最终目标是设计和评估下一代卫星网络的端到端资源管理，有效地与空中接口设计师提出的解决方案的范围，以提高传输的可用性。特别是，我们想了解效率和系统复杂性方面的权衡。 为了实现这一最终目标，我们将研究：1。用于大型GEO OBP系统的静态端到端资源管理。术语静态指的是编码和调制是固定的。这里的重点将是开发和评估可扩展、健壮、灵活和保护OBP的机制（即，天空中的开关）。我们将建立在我们以前在该领域的广泛工作的基础上，我们为大型GEO弯管系统开发了可扩展的，强大的，灵活的端到端资源管理。网络可用性。卫星网络设计人员的主要关注之一是，尽管频带的特性很难，但仍要向用户提供“适当”的服务水平。然而，“适当的服务水平”的含义并不十分清楚，因为它可能因用户或应用程序而异。大多数研究都集中在在线链接的可用性上，而没有考虑网络和应用程序方面。我们相信，协调低层与上层将为我们提供一个灵活和具有成本效益的解决方案，使系统能够根据用户的需求和支付意愿为他们提供不同级别的网络可用性。因此，网络可用性可以被看作是一种QoS要求，应该以这种方式定义和研究.设计端到端的资源管理系统，包括第1/2层的机制，以动态地提高上行链路的可用性，从而提供灵活和成本有效的服务给用户。我们需要提出解决方案并对其进行评估，以确保复杂性的增加在效率方面是值得的。我们还将提出和研究一些动态定价方案与BoD集成，以便允许用户表示他们愿意支付的容量在上下文中的总可用容量是可变的，由于链路损伤。