【導(dǎo)讀】單片機(jī)具有體積小、功能強(qiáng)、成本低、應(yīng)用面廣等優(yōu)點，可以說智能化控。制與自動控制的核心就是單片機(jī)?；趩纹瑱C(jī)的控制系統(tǒng)已廣泛應(yīng)用于各行業(yè)。程，使其實現(xiàn)復(fù)位、定時和報警的功能。本次設(shè)計的系統(tǒng)實用性強(qiáng)、判斷精確、操。作簡單、擴(kuò)展功能強(qiáng)。

　　

【正文】 services include: 9001800MHz second generation GSM digital cellular mobile telemunication business, 800MHz second generation CDMA digital cellular mobile munications services, third generation digital cellular mobile munications business. 1. 900/1800MHZ GSM the second generation of digital cellular business 900/1800MHz short titles of the second generation of GSM digital cellular mobile munications GSM mobile munication business refers to work in the 9001800MHz band of GSM mobile munications works provide voice and data services. Wireless interface of GSM mobile munication system using TDMA technology, core work mobility management protocol MAP Protocol. Over 900/1800mhz GSM the second generation of digital cellular business includes the following major types ： Bi directional voice service end to end. Mobile Messaging service, using the GSM work and launched mobile messaging platform, mobile business of messages received. On the move to hosted business and mobile data services. Mobile supplementary services, such as calling number display, call forwarding business. Common GSM work and intelligent work to offer mobile intelligent work services, such as prepaid services, and so on. Domestic roaming and international roaming service. 900/1800MHZ GSM the second generation of digital cellular business operators of the anization must own GSM mobile munications work, the mobile types can be a part or all. To provide a mobile work of the operators is the same work, with different operators. Provide work pleted between the mobile international business and must be approved by the state of international munications door. 2. 800MHz second generation CDMA digital cellular mobile munications business 800MHz second generation CDMA digital cellular mobile telemunication CDMA mobile munication services for short refers to work on the 800MHz band of CDMA mobile munication work to provide voice and data services. CDMA 基于 51 單片機(jī)的 8 路搶答器的設(shè)計 30 wireless interface of mobile munication using narrow band CDMA code division multiple access technology, core work mobility management protocol uses IS41 protocols. 800MHz second generation CDMA digital cellular mobile munications services include the following business types : Bi directional voice service end to end. Mobile Messaging service, using CDMA works and mobile messaging platform, mobile business of messages received. On the move to hosted business and mobile data services. Mobile supplementary services, such as calling number display, call forwarding business. CDMA work together with intelligent works to offer mobile intelligent work services, such as prepaid services, and so on. Domestic roaming and international roaming service. 800MHz second generation CDMA digital cellular mobile telemunication business operators must form a CDMA mobile munications work, provided by the mobile munications business types can be part or all of. Provide a work of mobile munications business pass, can be the same operator work, can also be done by works of different operators. Providing international munication services in mobile works, must be approved by the State import and export of international munication. 3. Third generation digital cellular mobile munications business Short titles of the third generation of digital cellular mobile munication 3G mobile munication business refers to the use of third generation mobile munications works provide voice, data, video, images and other business operations. Main features of the third generation of digital cellular mobile munications services is to provide mobile broadband multimedia services, which under the fast moving environment to support 144kbs rate, walking and slow mobile support 384kbs rates, indoor environment supporting 2Mbs rate of data transfer, and to guarantee reliable QoS quality of service. Third generation digital cellular mobile munications business, including the second generation cellular mobile munications can provide all types of business and mobile multimedia services. Third generation digital cellular mobile telemunication business operators must form a 3G of mobile munications work, provided by the mobile munications business types can be part or all of. Provide a work of mobile munications business pass, can be the same operator work facilities or pleted by the different operators of the work infrastructure. Providing international munication services in mobile works, must be approved by the State import and export of international munication. 基于 51 單片機(jī)的 8 路搶答器的設(shè)計 31 譯 文 蜂窩移動通信原理 蜂窩移動通信 是采用蜂窩無線組網(wǎng)方式，在終端和網(wǎng)絡(luò)設(shè)備之間通過無線通道連接起來，進(jìn)而實現(xiàn)用戶在活動中可相互通信。其主要特征是終端的移動性，并具有越區(qū)切換 和跨本地網(wǎng)自動漫游功能。蜂窩移動通信業(yè)務(wù)是指經(jīng)過由基站子系統(tǒng)和移動交換子系統(tǒng)等設(shè)備組成蜂窩移動通信網(wǎng)提供的話音、數(shù)據(jù)、視頻圖像等業(yè)務(wù)。 蜂窩移動通信業(yè) 務(wù)包括： 900/1800MHz GSM 第二代數(shù)字蜂窩移動通信業(yè)務(wù)、800MHz CDMA 第二代數(shù)字蜂窩移動通信業(yè)務(wù)、第三代數(shù)字蜂窩移動通信業(yè)務(wù)。 1． 900/1800MHz GSM 第二代數(shù)字蜂窩移動通信業(yè)務(wù) 900/1800MHz GSM 第二代數(shù)字蜂窩移動通信（簡稱 GSM 移動通信）業(yè)務(wù)是指利用工作在 900/1800MHz 頻段的 GSM 移動通信網(wǎng)絡(luò)提供的 話音和數(shù)據(jù)業(yè)務(wù)。GSM 移動通信系統(tǒng)的無線接口采用 TDMA 技術(shù)，核心網(wǎng)移動性管理協(xié)議采用 MAP協(xié)議。 900/1800MHz GSM 第二代數(shù)字蜂窩移動通信業(yè)務(wù)包括以下主要業(yè)務(wù)類型： －端到端的雙向話音業(yè)務(wù)。 －移動消息業(yè)務(wù)，利用 GSM 網(wǎng)絡(luò)和消息平臺提供的移動臺發(fā)起、移動臺接收的消息業(yè)務(wù)。 －移動承載業(yè)務(wù)以及其上的移動數(shù)據(jù)業(yè)務(wù)。 －移動補(bǔ)充業(yè)務(wù)，如主叫號碼顯示、呼叫 轉(zhuǎn)接 業(yè)務(wù)等。 －經(jīng)過 GSM 網(wǎng)絡(luò)與智能網(wǎng)共同提供的移動智能網(wǎng)業(yè)務(wù)，如預(yù)付費業(yè)務(wù)等。 －國內(nèi)漫游和國際漫游業(yè)務(wù)。 900/1800MHz GSM 第二代數(shù) 字蜂窩移動通信業(yè)務(wù)的經(jīng)營者必須自己組建 GSM移動通信網(wǎng)絡(luò)，所提供的移動通信業(yè)務(wù)類型可以是一部分或全部。提供一次移動通信業(yè)務(wù)經(jīng)過的網(wǎng)絡(luò)可以是同一個運(yùn)營者的網(wǎng)絡(luò)，也可以由不同運(yùn)營者的網(wǎng)絡(luò)共同完成 。提供移動網(wǎng)國際通信業(yè)務(wù)，必須經(jīng)過國家批準(zhǔn)設(shè)立的國際通信出入口 2． 800MHz CDMA 第二代數(shù)字蜂窩移動通信業(yè)務(wù) 800MHz CDMA 第二代數(shù)字蜂窩移動通信（簡稱 CDMA 移動通信）業(yè)務(wù)是指利用工作在 800MHz 頻段上的 CDMA 移動通信網(wǎng)絡(luò)提供的話音和數(shù)據(jù)業(yè)務(wù)。 CDMA移動通信的無線接口采用窄帶碼分多址 CDMA 技術(shù)， 核心網(wǎng)移動性管理協(xié)議采用IS41 協(xié)議。 800MHz CDMA 第二代數(shù)字蜂窩移動通信業(yè)務(wù)包括以下主要業(yè)務(wù)類型： －端到端的雙向話音業(yè)務(wù)。 －移動消息業(yè)務(wù)，利用 CDMA 網(wǎng)絡(luò)和消息平臺提供的移動臺發(fā)起、移動臺接收的消息業(yè)務(wù)。 －移動承載業(yè)務(wù)以及其上的移動數(shù)據(jù)業(yè)務(wù)。 －移動補(bǔ)充業(yè)務(wù)，如主叫號碼顯示、呼叫前轉(zhuǎn)業(yè)務(wù)等 。 －經(jīng)過 CDMA 網(wǎng)絡(luò)與智能網(wǎng)共同提供的移動智能網(wǎng)業(yè)務(wù)，如預(yù)付費業(yè)務(wù)等。 －國內(nèi)漫游和國際漫游業(yè)務(wù)。 800MHz CDMA 第二代數(shù)字蜂窩移動通信業(yè)務(wù)的