ITR - (ASE+ECS) - (dmc+soc): A Framework for Heterogenious Quality-of-Service Guarantees in Wireless Networks: A Communication-theoretic Approach

在无线通信系统中，具有数据、语音和多媒体等不同信息内容的用户通过具有不同的可靠性要求来约束网络。在该项目中，考虑了一种能够为用户提供异质可靠性保证的框架，这为无线网络中的性能权衡增加了一个全新的维度，并且是多终端通信系统所独有的。这就好像网络具有可以在用户之间分配的一定量的可靠性。这是一个非常普遍的概念，可以应用于任何多终端通信问题，这是通过为网络中的用户定义各个错误概率来实现的。因此，对于固定的用户速率向量，系统可以在用户之间提供可靠性的权衡。这组可实现的可靠性被称为多用户网络的多用户可靠性简档。该分布是容量区域内传输速率向量的函数。对于采用多天线的无线系统，该分布称为多用户分集增益分布。此外，这些保证直接体现在物理层，并且可以在网络体系结构的更高层中转换为服务质量保证。与将此任务降级到更高网络层的传统方法相比，这是一个明显的转变。因此，在异质无线网络中，使用本项目所考虑的技术可以更有效地实现异质服务质量保证。该项目预计将对下一代无线网络的设计产生重大影响。

In wireless communication systems, users with heterogeneous information content such as data, voice, and multimedia constrain the network by having different reliability requirements. In this project a framework which can provide heterogeneous reliability guarantees for the users is considered.This adds a completely new dimension to the trade-off of performance in a wireless network, and is unique to multiterminal communication systems. It is as if the network has some amount of reliability that can be allocated among the users. This is a very general concept and can be applied in any multiterminalcommunication problem.This is accomplished by defining individual probabilities of errors for the users in the network. Hence for a fixed vector of rates of the users, a system can provide a trade-off of reliabilities among the users. This set of achievable reliabilities is referred to as the multiuser reliability profile of a multiuser network. This profile is a function of the vector of transmission rates inside the capacity region.For a wireless system employing multiple antennas, this profile is referred to as multiuser diversity gainprofile. Further, these guarantees are directly manifested in the physical layer and can be translated into QoS guarantees in the higher layers in the network architecture. This is a marked shift from conventional approaches that relegate this task to the higher network layers. Hence in a heterogeneous wireless networks,heterogeneous QoS guarantees can be more efficiently realized using the techniques considered in this project. This project is expected to have a significant impact on the design of the next generation of wireless networks.