Wireless and Mobile Communications

Handbook of Research on Ubiquitous Computing Technology for Real Time Enterprises Pub Date : 1900-01-01 DOI:10.4018/978-1-59904-832-1.CH006

J. Schiller

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引用次数: 6

Abstract

Figure 1 gives a rough overview of some prominent wireless communication systems focusing on the two parameters gross data rate and relative speed between sender and receiver. Assuming a mobile end-user connected to a stationary transceiver station, the points on the (non proportional) speed axis resemble nonmoving persons, pedestrians, cars downtown, cars outside cities, and cars on a highway, respectively. Note that high-speed trains and airplanes cannot be accommodated by most technologies without specialized equipment. In the range suitable for higher speeds, we find typical mobile telecommunication systems offering mainly voice service and covering whole countries (see Schiller (2003) for a comparison). The most successful system is GSM (global system for mobile communication) with its successor UMTS (universal mobile communications system) for higher data rates. While GSM can be enhanced for higher data rates with GPRS (general packet radio service) and EDGE (enhanced data rates for global evolution), UMTS with its new enhancements HSDPA (high speed downlink packet access) and HSUPA (high speed uplink packet access) can deliver even higher data rates abstract

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无线及流动通讯

图1给出了一些突出的无线通信系统的粗略概述，重点关注发送方和接收方之间的总数据速率和相对速度这两个参数。假设移动终端用户连接到固定收发器站，(非比例)速度轴上的点分别类似于不移动的人、行人、市中心的汽车、城市外的汽车和高速公路上的汽车。请注意，如果没有专门的设备，大多数技术无法适应高速列车和飞机。在适合更高速度的范围内，我们发现典型的移动电信系统主要提供语音服务并覆盖整个国家(参见Schiller(2003)进行比较)。最成功的系统是GSM(全球移动通信系统)及其继承者UMTS(通用移动通信系统)，用于更高的数据速率。GSM可以通过GPRS(通用分组无线电业务)和EDGE(全球演进的增强数据速率)来增强更高的数据速率，而UMTS通过其新的增强HSDPA(高速下行分组接入)和HSUPA(高速上行分组接入)可以提供更高的数据速率

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Handbook of Research on Ubiquitous Computing Technology for Real Time Enterprises

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