【導(dǎo)讀】嵌入式系統(tǒng)與Intenret技術(shù)的結(jié)合己經(jīng)成為未來嵌入式系統(tǒng)的發(fā)展趨勢，而基于ARM的嵌入。式系統(tǒng)由于其低功耗、低成本、高性能等優(yōu)勢己經(jīng)廣泛地應(yīng)用于工業(yè)控制領(lǐng)域。武器控制，從導(dǎo)彈、坦克、艦艇、雷達(dá)、電子對抗等軍事電子裝備到軍事通。信及軍事指揮系統(tǒng)。業(yè)電子設(shè)備;汽車、機車等電子設(shè)備;通訊控制器及通訊設(shè)備等。是覆蓋全國的GPRS網(wǎng)絡(luò)已成為一種可持續(xù)利用和開發(fā)的資源。簡稱，即通用無線分組業(yè)務(wù)。它是基于現(xiàn)在運行的GSM基礎(chǔ)上發(fā)展的數(shù)據(jù)業(yè)務(wù)，類似于固定交換技。術(shù)中的數(shù)據(jù)分組業(yè)務(wù)；GPRS采用了GSM同樣的無限調(diào)制技術(shù)，同樣的頻率，同樣的TDMA幀結(jié)構(gòu)，GPRS允許用戶在端到端分組。GPRS特別適用于間斷的、突發(fā)性的和頻繁的、少量的數(shù)據(jù)傳輸，也適用。不間斷的信息服務(wù)，利用GPRS可以使用戶在移動狀態(tài)下使用各種高速數(shù)據(jù)業(yè)務(wù)，包括收發(fā)E-mail,使用GPRS，可以實現(xiàn)數(shù)據(jù)分組發(fā)送和接收，用戶永遠(yuǎn)在線且按流量、時間計費，減低了。GPRS模塊與控制器間是通過串行口進行通信的，通信的協(xié)議是AT

　　

【正文】 陜西理工學(xué)院畢業(yè)設(shè)計 第 28 頁 共 43 頁 附錄 A 英文文獻(xiàn)原文 ARM9based chip S3C2410a of GPRS date terminal design system of GPRS With the development of technology, human pace of life speeds up, information on the status of living has bee increasingly important, how convenient and timely and effective access to information bee a modern information processing in the key issues. In this demand, China Mobile GPRS business people operating in time to vote, the application of wireless data munications more widely. Relative of the original GSM dialup method of circuitswitched data transmission. GPRS is a packet switching technology, with realtime online billing by volume, quick sign, highspeed transmission, easily switch the merits. GPRS using packet switching technology, data transmission rate to a maximum theoretical value of kb / s. Circuitswitched data rate of kb / s, so the transmission speed of GPRS has a unique advantage. As more of its own is a packet data work to support the TCP / IP protocol, without going through the PSTN, and other work adapter, can be directly connected with the Inter work, GPRS in the advantages of information processing is unparalleled. GPRS data terminals in order to satisfy the lowcost, small size and other requirements of a flexible and mobile, using ARM9 chip S3c2410a of GPRS data terminal control. In this paper, S3C2410a in transplantation is the Linux operating system, through the Linux operating system can be quickly and easily for data transmission and work device control。 at the same time improve the system performance, improved system reliability, and the further expansion and development of properties Is improved. 1 GPRS technology GPRS principle GPRS is the full name of the English General Packet Radio Service, translated as General Packet Radio Service, which is used to exchange (PacketSwitched) developed the concept of a wireless transmission. The socalled packetswitched, that is packaged as many independent Data packets, and then send these packets out on January 1, somewhat similar to the post office in the form of sending parcels. Its role is only when the information is transmitted only when necessary occupied bandwidth, and can transmit the amount of data pricing, which the majority of users is a more reasonable cost, because, like Interact such data transfer most of the time Bandwidth is idle. GPRS work is based on the existing GSM work to the realization of the existing GSM work in the need to increase the number of nodes, such as GGSN (Gateway GPRS Supporting Node, GPBS gateway support node) and SGS (Serving GSN, GPRS services to support node) , GSN GPRS work is the most important work nodes. GSN is mobile routing management capabilities, it can connect all types of data works, and can be connected to the GPRS register. GSN can plete all kinds of mobile devices and data works and 陜西理工學(xué)院畢業(yè)設(shè)計 第 29 頁 共 43 頁 data transmission between the format conversion. GSN can be a router similar to the independent equipment, and GSM can also be integrated in the MSC. GSN There are two types: one for the SGSN (Serving GSN, services GSN), another for the GGSN (Gateway GSN, Gateway GSN). SGSN the main role is to record the current location of mobile terminals, and in the mobile terminals and GGSN plete mobile packet data between the sending and receiving. GGSN is the main gateway from the role it can and a wide range of data work connections. Such as ISDN. PSPDN and LAN, and so on. GGSN can GSM work in the GPRS packet data protocol conversion kit, these groups can send data packets to a remote TCP / IP or work. GPRS work, through routing for addressing management and the establishment of a data connection, GPRS and routing management in the following three aspects: First, mobile terminals send data to establish the routing。 Second, mobile terminals receive data to establish the routing。 The third is roaming mobile terminals in the establishment of data routing. For the first case, when the mobile terminals resulted in a PDU packet data unit, the PDU after SNDC layer, called the SNDC data unit, and then layer after LLC LLC frame for processing and, through air interface to the GSM work Mobile terminals where the SGSN, SGSN data to the GGSN, GGSN received the news of equipment for processing, conversion to a public data work can be transmitted in a format (such as PSPDN the PDU), eventually gave the public data work Users. In order to improve the transmission efficiency and to guarantee the security of data transmission, air interface can be done on the data pression and encryption processing. In the second case, a public data work users to transmit data to mobile terminals, the first data work through the establishment of the standard agreement between the GGSN and data work routing. Data work users sent the data units (such as PSPDN in the PDU), through the establishment of good routing of the data unit PDU gave GGSN. GGSN PDU and then gave the host mobile terminals on the SGSN, GSN the PDU packaged as SNDC data unit, and then after LLC LLC frame for the handling of the unit, gave the eventual adoption of air interface for mobile terminals. The third situation is a data work to transmit data to a user is roaming of mobile users. Under such circumstances the data to be transmitted through ownership of the GGSN, and then sent to the Ausers. GPRS model agreement Um interface is a GSM air interface. Um interface munication protocol on the five level, bottomup followed by the physical layer, MAC (Media Access Control) layer, LLG (Logical LinkControl) layer, SNDC layer and work layer. Um interface for the physical layer of the radio frequency interface, and the physical link layer is responsible for providing air interface of Luojixindao.