ITR: Power Efficient Multimedia Wireless Communications

服务质量（QoS）措施的数量和多样性对多媒体无线通信系统的设计和运行提出了重大挑战。每个信息源（数据、音频、视频）都有自己的信号质量度量标准，网络对每个信息源的容量有一个综合度量标准（例如，电话流量和数据吞吐量的erlang）。除了信号质量和网络容量外，便携式终端的电池寿命对移动信息服务对消费者的价值也有重要影响。现有的质量优化知识通常局限于对单个来源的研究。在20世纪90年代，在蜂窝电话通信的无线电资源管理方面创建了一个重要的知识体系。最近，研究界把注意力转向了无线数据和视频。每项研究都侧重于一种信息类型的一种或两种质量度量：例如，视频的功率和失真；数据的功率和吞吐量。本项目通过将QoS度量的集合视为多维空间中的一个点，采取了更全面的观点。给定一个系统设计和一组运行条件，可达到的点构成一个可行性体积，最优点在表面上。在这个公式中，我们通过分析体积在QoS维度的各种组合上的投影来研究数据和视频的同时传输，包括：视频失真；每个源的数据吞吐量；每个数据源的数据效用；终端总功耗（信号处理功率和传输功率）；在一个基站上同时传输视频的数量；基站总吞吐量；聚合基站效用。重点是节能通信，其结果为联合适应向同一基站传输信号的终端的以下特性提供了指导：数据终端的传输功率和速率以及视频终端的传输功率、压缩和信道编码。

The large number and diversity of quality of service (QoS) measures present a significant challenge to the design and operation of multimedia wireless communications systems. Each information source (data, audio, video) has its own metrics of signal quality and the network has an aggregate measure of capacity for each source (for example, Erlangs of telephone traffic and data throughput). In addition to signal quality and network capacity, the battery life of a portable terminal has a major effect on the value of mobile information services to consumers. Existing knowledge of quality optimization is generally confined to studies of individual sources. In the 1990s, a significant body of knowledge was created on radio resource management for cellular telephone communications. More recently, the research community has turned its attention to wireless data and video. Each study focuses on one or two quality measures for one type of information: for example, power and distortion for video; power and throughput for data. This project takes a more comprehensive view by considering the collection of QoS measures to be a point in a multidimensional space. Given a system design and a set of operating conditions, the achievable points constitute a feasibility volume, with optimum points on the surface. Within this formulation, we study simultaneous transmission of data and video by analyzing projections of the volume onto various combinations of QoS dimensions including: video distortion;data throughput for each source;data utility for each source;total power dissipation (signal processing power and transmission power) in a terminal;number of simultaneous video transmissions at a base station;aggregate base station throughput;aggregate base station utility.The emphasis is on power efficient communications and the results provide guidance on joint adaptation of the following properties of terminals that transmit signals to the same base station: transmission power and rate in data terminals and transmission power, compression, and channel coding in video terminals.