英语翻译随着移动通信技术的发展,无线蜂窝网的覆盖面越来越广,移动通信发起的紧急呼叫数量在全部紧急呼叫中所占的比例也随之上

英语翻译
随着移动通信技术的发展,无线蜂窝网的覆盖面越来越广,移动通信发起的紧急呼叫数量在全部紧急呼叫中所占的比例也随之上升.现有的蜂窝网能为移动通信紧急呼叫提供的辅助决策信息非常少,调查表明,约有25%的移动用户在发起紧急呼叫时不知道所处的确切位置,这对极时合理的处警带来很多限制.因此,移动通信网要能为发起紧急呼叫的移动用户提供准确的定位信息.
　　蜂窝移动通信已成为世界范围内的一项非凡成功之作,其发展如此迅速以致业务需求远远超过了原先的预测.大多数情况下,经营者只限定在一个固定频段上,几乎无望增加频谱而原来的模拟技术也不能加以扩展跟上需求的发展.较新的技术具备了频谱的更有效利用以及为用户提供改善的安全性和更多的便利.即使如此,分配给这些新技术的频段常常与老技术所用的重叠,这使得转移策略复杂起来.
　　传统上欧洲使用900MHz频段而北美使用800MHz频段.多数亚洲国家同时使用两个频段.欧洲900MHz分配频率的主要模拟标准是全接入通信系统,虽然某些欧洲国家使用其它标准GSM是 900MHz频段的一种数字系统,已为欧洲采用为共同标准并在世界上许多其它国家使用,提供了非常有用的漫游设备.此外,GMS标准已用于1800MHz(DCS 1800).一些国家正建立独立的1800 MHz网而另一些正试图用此频段增加其GSM容量.因为在两个频段上使用相同协议,现在越来越普遍使用GMS－900和GSM－1800这些术语而不用GSM和DCS1800.

译文如下,望博主采纳,
With the development of mobile communication technology, wireless cellular network coverage more widely,and the number of emergency calls initiated mobile communications in the share of all emergency calls will also rise in proportion. The existing cellular network can provide mobile communications for emergency call to auxiliary decision which is very small, the survey shows that about 25% of mobile users do not know the exact location when they initiate an emergency call , which brings the timely reasonable alarm to many restrictions .Accordingly, the mobile communication network can be able to provide accurate location information for mobile users to initiate an emergency call.
Cellular mobile communication has become an extraordinary success around the world , its development is so rapid that the business requirements far more than the original forecast.For the most part, the operator only restricts a fixed frequency, and almost hopeless increase the spectrum while the expansion original analog technology can not keep pace with demand . More recent technologies have more efficiently use the spectrum and provide users with improved safety and greater convenience.Nevertheless, the frequency band which are assigned to these new technologies are often overlapped with older technologies , which makes the transfer policy complicated.
Traditionally ,the 900MHz band was used in Europe while North America use 800MHz band, and
most Asian countries use both bands.The main criteria of the European 900MHz of analog frequency of allocation is a full access communication system, although some European countries using other standard GSM is a digital system 900MHz frequency band, which has been used in Europe as a common standard and many other countries in the world use, and provided a very useful device roaming.In addition, GMS standard has been used to 1800MHz (DCS 1800). Some countries are setting up an independent 1800 MHz network while others are trying to increase their use of this band GSM capacity. Because both bands using the protocol is uniform, and now people more commonly used the terms of GMS-900 and GSM-1800 rather than GSM and DCS1800.