CAREER: Efficient Resource Management and Multi-Access Protocols for Bursty Traffic Over Wireless Networks: A Cross-Layer Design Approach

近年来，人们对无处不在的信息访问的需求有了巨大的增长。 然而，目前的无线网络仍然远远不能满足这一需求。无线系统设计中的一个中心问题是如何在无线链路上有效地传输突发多媒体业务。 预计开发利用通信信道和上层协议层之间相互作用的网络级解决方案将产生显着的性能增益。 跨多个层的优化设计开辟了一个新的有前途的领域，许多设计问题尚未解决。 因此，发展相关理论和方法，以推动该领域的重大进展和革命性突破，是至关重要的。在本项目中，PI提出采用跨层设计方法，设计一套资源分配和多址接入方案，旨在建立一个在衰落信道上传输突发业务的综合框架。 所提出的研究集中在两个领域：1）CDMA上的突发业务：该推力的关键目标是获得干扰受限系统中突发业务传输的跨层优化的最重要原则;以及2）突发业务的“机会主义”接入控制：本研究的目的是深入了解如何利用业务信息在机会通信系统中进行新的接入控制（其基本上是配备有机会调度的TDMA系统）。贯穿始终的一个共同思路是“利用”（而不是“打击”）流量突发和信道变化。1）CDMA网络中的突发业务传输：基于PI最近发现的多址干扰（MAI）是长距离相关的，PI将 a.对MAI的长期相关性进行全面研究，并确定预测MAI 结构，并利用MAI结构来开发有效的基于测量的干扰 预测.流量突发性、衰落和反馈延迟的影响将被检查; B.利用干扰预测来探索有效的资源分配和接入控制。2） 机会通信系统中的突发业务传输：PI将： a. 研究机会通信系统中业务辅助接纳控制; B.为流媒体设计创新的机会调度，以利用多用户分集 增益嵌入在信道变化和业务突发两者中。

Recent years have witnessed a tremendous growth in the demand for ubiquitous information access. Current wireless networks, however, are still far from meeting this demand. A central problem in the design of wireless systems is how to efficiently transmit bursty multimedia traffic over wireless links. It is expected that developing network-level solutions that take advantage of the interplay between the communication channel and the upper protocol layers would yield significant performance gains. Optimal design across multiple layers opens a new promising area with many design issues unresolved. It is therefore of vital importance to develop theory and methodology that help propel significant advances and lead to revolutionary breakthroughs in this area.In this project, the PI proposes to take a cross-layer design approach to devising a suite of resource allocation and multi-access schemes, aiming to establish a comprehensive framework for transmitting bursty traffic over fading channels. The proposed research is centered around two areas: 1) bursty traffic over CDMA: a key goal of this thrust is to obtain overriding principles for cross-layer optimization of bursty traffic transmissions in interference-limited systems; and 2) "opportunistic" access control for bursty traffic: this thrust aims at a deep understanding of how to exploit traffic information for novel access control in opportunistic communication systems (which are basically TDMA systems equipped with opportunistic scheduling). A common thread encountered throughout is to "exploit" (rather than "combat") traffic burstiness and channel variation. The two thrusts are outlined as follows:1) Bursty traffic transmission in CDMA networks: Building on the PI's recent finding that the multi-access interference (MAI) is long-range dependent, the PI will a. conduct a comprehensive study on the MAI long-range dependence and identify the predictive MAI structure, and exploit the MAI structure to develop efficient measurement-based interference prediction. The impact of traffic burstiness, fading, and feedback delay will be examined; b. utilize interference prediction to explore efficient resource allocation and access control.2) Bursty traffic transmission in opportunistic communication systems: The PI will: a. investigate traffic-aided admission control for opportunistic communication systems; b. devise innovative opportunistic scheduling for streaming multimedia to exploit multi-user diversity gain embedded in both channel variation and traffic burstiness.