【正文】 ............................................................... 5 2 GPRS 通信無線網(wǎng)絡的介紹 ................................................................................................. 7 什么是 GPRS 無線通訊網(wǎng)絡 ...................................................................................... 7 為什么要有 GPRS ............................................................................................. 7 GPRS 的承載業(yè)務 ...................................................................................................... 7 GPRS 的網(wǎng)絡 結構 ...................................................................................................... 9 GPRS 協(xié)議棧 ................................................................................................... 10 基于 GPRS 的 TCP/IP 協(xié)議 ............................................................................ 10 GPRS 究竟是什么 ........................................................................................... 11 GPRS 有什么優(yōu)點 ........................................................................................... 12 中國移動發(fā)展 GPRS 的市場定位是什么 ................................................................ 13 G 先鋒 — GPRS ................................................................................................ 13 3 GPRS 通信系統(tǒng)的整體設計方案 ....................................................................................... 14 GPRS 通信系統(tǒng)的方案論證 ..................................................................................... 14 GPRS 通信系統(tǒng)的硬件設計方案 ............................................................................. 15 系統(tǒng)總體功能概述 .......................................................................................... 15 單片機的用途和使用 ...................................................................................... 16 單片機 STC89C51 簡介 .................................................................................. 17 CTM900CGPRS 模塊簡介 ............................................................................. 18 GPRS 通信系統(tǒng)的軟件設計方案 ............................................................................. 19 連接的建立 ...................................................................................................... 19 數(shù)據(jù)處理 ........................................................................................................ 28 主程序流程 ...................................................................................................... 28 系統(tǒng)程序 ........................................................................................................ 30 電路原理圖 .................................................................................................... 38 結 論 ........................................................................................................................................ 39 理工大學學士學位論文 IV 致 謝 ........................................................................................................................................ 40 參考文獻 .................................................................................................................................. 41 附錄 A 英文原文 ................................................................................................................... 42 附 錄 B 漢語翻譯 ................................................................................................................... 49 理工大學學士學位論文 5 1 緒 論 課題的背景和意義 GPRS 通用無線分組業(yè)務（ General Packet Radio Service）是利用包交換的概念發(fā)展的一套無線傳輸方式。s main function is to record the current position of mobile terminals, and mobile packet data between mobile terminal and the GGSN in sending and receiving. GGSN main gateway role, with a variety of data work connection, such as ISDN (integrated services digital work), PSPDN (packet switching public data work) and LAN (local area work (LAN), etc. GGSN can put GSM GPRS packet in the packet, protocol conversion, thus the packet packets to the remote TCP/IP or x. 25 work. GPRS work not only has wide coverage, data transmission speed, high munication quality, always online and charged according to traffic advantages, and its type is itself a packet data work, support TCP/IP protocol, can be directly exchanged with the Inter. As a result, the CPRS in portable wireless Inter access, environmental monitoring, traffic monitoring, mobile office, etc have an unparalleled price advantage. System software using C language to write, pile under VB environment. Because this system is a remote terminal management module, so in the writing of the program must adhere to certain protocols, in order to ensure correct munication. The body of the program is how to control the AT mand of GR47 of GR47 initial setup and handling of information data. Program in general can be divided into the following blocks: CPRS connection of initial setup, the judgment of the short message, no data transmission when the heartbeat process, data forwarding, etc. The main program is the program block anic bination together, mutual control, the infinite loop. Keywords: Data transmission and reception Singlechip。 單片機 。主程序是把這些程序塊有機結合到一起，相互控制，無限循環(huán) 。程序的主體是如何控制 GR47 的 AT 命令對 GR47 進行初始設置和對信息數(shù)據(jù)的處理。 系統(tǒng)軟件采用 C 語言編寫，在 VB 環(huán)境下編譯。 GPRS 網(wǎng)不但具有覆蓋范圍廣、數(shù)據(jù)傳輸速度快、通信質量高、永遠在線和按流量計費等優(yōu)點，而且其本身就是一個分組型數(shù)據(jù)網(wǎng)，支持 TCP/IP 協(xié)議，可以直接與 Inter互通。 GGSN 主要起網(wǎng)關作用，可以與多種不同的數(shù)據(jù)網(wǎng)絡連接，如 ISDN(綜合業(yè)務數(shù)字網(wǎng) )、 PSPDN(包交換公用數(shù)據(jù)網(wǎng) )和 LAN(局域網(wǎng) )等。在現(xiàn)有的 GSM 網(wǎng)絡中需要增加一些節(jié)點，如 GGSN(GPRS 網(wǎng)關支持節(jié)點 )和 SGSN(GPRS 服務支持節(jié)點 )。理工大學學士學位論文 I 各專業(yè)完整優(yōu)秀畢業(yè)論文設計圖紙 摘 要 GPRS(通用分組無線電業(yè)務 )是利用包交換的概念發(fā)展的一套無線傳輸方式。GPRS 網(wǎng)絡是基于現(xiàn)有的 GSM(全球移動通信系統(tǒng) )網(wǎng)絡實現(xiàn)的。 SGSN 的主要作用是記錄移動終端的當前位置信息，并且在移動終端與 GGSN 之間完成移動分組數(shù)據(jù)的發(fā)送和接收。 GGSN可以把 GSM網(wǎng)中的 GPRS分組數(shù)據(jù)包進行協(xié)議轉換，從而把這些分組數(shù)據(jù)包傳送到遠端的 TCP/IP 或 。因此， CPRS 在無線上網(wǎng)、環(huán)境監(jiān)測便攜型、交通監(jiān)控、移動辦公等行業(yè)中具有無可比擬的性價比優(yōu)勢。由于本系統(tǒng)是遠程管理終端的一個模塊，因此在程序的編寫中要遵守 一定的協(xié)議，這樣才能保證正確通信。程序總體上可以分為