基于单片机GPRS通信系统的计 毕业设计 好

基于单片机GPRS通信系统的计

基于单片机GPRS通信系统的计

摘要

GPRS（通用分组无线电业务）是利用包交换的概念发展的一套无线传输方式，GPRS网络是基于现有的GSM（全球移动通信系统）网络实现的，在现有的GSM网络中需要增加一些节点，如GGSN（GPRS网关支持节点）和SGSN（GPRS服务支持节点）。SGSN的主要作用是记录移动终端的当前位置信息，并且在移动终端与GGSN之间完成移动分组数据的发送和接受。GGSN主要起网关作用，可以与多种不同的数据网络连接，如ISDM（综合业务数字网）、PSPDN（包交换公用数据网）和LAN（局域网）等。GGSN可以把GSM网中的GPRS分组数据包进行协议转换。从而把这些分组数据包传送到远端的TCP/IP或X.25网络。GPRS网不但具有覆盖范围广、数据传输速度快、通信质量高、永远在线和按流量计费等有点，而且其本身就是一个分组性数据网，支持TCP/IP协议，可以直接与Internet互通。因此，GPRS在无线上网、环境监测便携型、交通监控、移动办公等行业中具有无可比拟的性价比优势。

关键词：数据传输与接收 单片机 GPRS通信系统

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基于单片机GPRS通信系统的计

Abstract

GPRS (general packet radio service) is to use the concept of packet switching the development of a wireless transmission, a GPRS network is based on existing GSM (global system for mobile communications) network realization, in the existing GSM network of some nodes need to increase, such as GGSN (GPRS gateway support node) and SGSN (GPRS service support node).The main Function is to record SGSN mobile terminal current position information, and in the mobile terminal and GGSN completed of mobile group data to send and receive. GGSN main up gateway function, and can be with a variety of different data network, such as ISDM (integrated services digital network), PSPDN (packet switching public data networks) and LAN (local area network), etc. GGSN can put the GSM network packets of GPRS group for protocol conversion. So the group sent packets to a remote TCP/IP or X.25 network. GPRS nets not only has to cover range, data transmission speed, high quality, and always online communication according to flow billing, and a bit, and its itself is a group sex data networks, support the TCP/IP protocol, can be directly and Internet communication. Therefore, GPRS is in wireless Internet and environmental monitoring portable type, traffic monitoring, mobile office, and other industries with an unmatched price advantage.

Keywords：Data transmission and reception Single-chip, microcomputer,

GPRS communication system

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基于单片机GPRS通信系统的计

目录

摘要 ................................................................................................................ I Abstract ....................................................................................................... II 目录 ..............................................................................................................III 前言 ................................................................................................................1 1 GPRS通信 .................................................................................................2

1.1 国内外的研究现状 ..........................................................................2 1.2 课题研究的背景和意义 ..................................................................3 2 GPRS通信无线网络的介绍 .....................................................................5

2.1 什么是GPRS无线通讯网络 ..........................................................5 2.1.1 为什么要有GPRS.....................................................................5 2.2 GPRS的网络结构 ...........................................................................5 2.2.1 GPRS协议栈.............................................................................6 2.2.2 基于GPRS的TCP/IP协议......................................................7 2.2.3 GPRS究竟是什么.....................................................................8 2.2.4 GPRS有什么优点.....................................................................8 2.3 中国移动发展GPRS的市场定位是什么 ......................................9 2.4.3 G先锋—GPRS..........................................................................9 3 GPRS通信系统的整体设计方案 ........................................................... 11

3.1 GPRS通信系统的方案论证 ......................................................... 11 3.2 GPRS通信系统的硬件设计方案 .................................................13 3.2.1 系统总体功能概述..................................................................14 3.2.2 单片机的用途和使用..............................................................14 3.2.3 单片机STC89C51简介..........................................................15 3.2.4 GPRS模块简介及应用...........................................................16 3.2.5 CTM900-C GPRS模块简介 ...................................................17 3.3 GPRS通信系统的软件设计方案 .................................................17 3.3.1 连接的建立..............................................................................17

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