An Adaptive Protocol Suite for The Next Generation Wireless Internet

自15年前第一个无线通信系统问世以来，无线通信系统的技术和业务都取得了惊人的进步。目前提出的第三代（3G）系统为诸如语音呼叫和消息传送的低带宽服务提供漫游、更高容量和增加的灵活性。虽然未来的无线系统（第四代（4G）和更高）被设想为提供更高的容量，它们还被期望在以下方面支持异构性：（i）物理环境（范围从高带宽低错误率微微小区到低带宽高错误率宏小区）;（ii）网络架构（蜂窝、对等或其他混合网络模型）;以及（iii）应用（从低数据速率非实时应用到高数据速率实时应用）。在这个项目中，我们将研究几个关键要素，是必要的，以实现一个移动的站在4G无线系统的协议栈。最终的目标是开发一个自适应的协议套件，将适应自己的异质性的不同方面所表现出的下一代无线系统。特别是我们将研究以下问题：1.应用层错误率可伸缩性：我们提出了一个自适应多描述算法的错误率可伸缩性。数据率可伸缩性：我们引入了一个最佳的动态速率整形技术，在拥塞或带宽变化的情况下使用。联合优化实时视频流系统：我们提出了一个实时视频流系统集成提出的不平等错误保护机制，多描述编码技术，以及错误隐藏方法.安全一个自适应和可扩展的安全协议：我们提出采用有限域小波来开发新颖的和创新的公钥安全技术，以解决普遍性，可扩展性，移动性和可用性.我们提出了有效的安全协议，移动的设备有限的处理能力.传输层异构数据包流：我们建议研究可以支持更丰富语义集的传输协议，以适应应用程序在每帧基础上选择的可靠性语义。异构网络特性：我们建议构建一个单一的传输协议，以适应各种无线网络环境的特性。异构网络架构：我们建议探索传输层对底层网络模型（蜂窝、对等或混合）的自适应性.网络层应用要求：我们将探索网络层结构，使异构应用程序实现自定义网络层策略.异构网络架构：我们将探索使用新颖的状态传播方案和虚拟骨干网方法来增强传输层性能，并帮助适应异构网络模型.数据链路层速率兼容差错控制编码：我们使用有限域小波变换开发了新型速率兼容卷积码。 方案套件需要新的方案套件集成计划。该项目将包括四个阶段。在第一阶段，我们将设计协议套件的所有建议组件/协议/方法的细节。 在第二阶段，我们将在模拟测试平台上评估它们的性能。在第三阶段，我们将把各个模块集成到套件中，最后在第四阶段，我们将对拟议的协议套件进行原型设计，并在物理测试平台上评估其性能.

The technology and business of wireless communications systems have madespectacular progress since thefirst systems were introduced fifteen years ago. Currently proposed third generation (3G) systems offer roaming, higher capacity, and increased exibility for low bandwidth services, such as voice calls and messaging. While future wireless systems (fourth generation (4G) and higher) are envisioned to provide higher capacity, they are also expected to support heterogeneity in the following aspects: (i) physical environments (ranging from high-bandwidth low error-rate pico-cells to low-bandwidth high error-rate macro-cells); (ii) network architectures (cellular, peer-to-peer, or other hybrid network models); and (iii) applications (ranging from low-data rate non-real-time applications to high-data rate real-time applications). In this project, we will investigate several key elements that are necessary to realize a protocol stack for a mobile station in 4G wireless systems. The ultimate objective is to develop an adaptive protocol suite that would adapt itself to the different aspects of heterogeneity exhibited by the next generation wireless systems. In particular we willinvestigate the following problems:1. Application LayerError-rate scalability: We propose an adaptive multiple description algorithm for error-rate scalability.Data-rate scalability: We introduce an optimal dynamic rate shaping technique to be utilized in the case ofcongestion or bandwidth variations.Jointly optimal real-time video streaming system: We propose a real-time video streaming system integrates the proposed unequal error protection mechanism, the multiple description coding technique, and the error-concealment method.2. SecurityAn adaptive and scalable security protocols: We propose to employ finite-field wavelets to develop novel andinnovative public key security techniques that address ubiquity, scalability, mobility, and usability.We propose efficient security protocols for mobile devices with limited processing power.3. Transport LayerHeterogeneous Packet Flows: We proposetoinvestigate transport protocols that can support a much richerset of semantics, adapting to the reliability semantics chosen by applications on a per-frame basis.Heterogeneous Network Characteristics: We propose to build a single transport protocol that will adapt itselfto the characteristics of a variety of wireless network environments.Heterogeneous Network Architectures: We propose to explore transport layer adaptivity to the underlyingnetwork model (cellular, peer-to-peer, or hybrid).4. Network LayerApplication Requirements: We will explore network layer constructs that enable heterogeneous applicationsto implement custom network layer policies.Heterogeneous Network Architectures: We will explore the use of novel state propagation schemes and virtualbackbone approaches to enhance transport layer performance and help in adapting to heterogeneous networkmodels.5. Data Link LayerRate-compatible error control coding: We develop new types of rate-compatible convolutional codes usingfinite-field wavelet transforms. The protocol suite requires a new Protocol Suite Integration Plan. The project will consist of four phases. During the first phase we will design the details of all the proposed components/protocols/methods of the protocol suite. During the second phase we will assess their performance in a simulation testbed. During the third phase we will integrate the individual modules into the suite and finally in the fourth phase we willprototype the proposed protocol suite and we will assess its performance on a physical testbed.