Application software. Operating system. Memory. Processor. Fig 1. Embedded system components. Processor core. Other external devices

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1 Interntionl Conference on Informtion Science nd Computer Applictions (ISCA 2013 Reserch on The Key Technology of Embedded Linux Logistics System Jinli Chu, Xi Liub, Jun Lic, nd Xioji Chend Deprtment of Informtion Engineering, Xingti Polytechnic College, Xingti, P.R. Chin Keywords Keywords:: embedded; Linux; logistics system; key technology; system construction; GSM; RFID Abstrct.. Embedded Linux hs very wide rnge of pplictions, but lso for the field of logistics Abstrct informtion provides powerful nd flexible solution, this pper mkes reserch on the key technology. First of ll, reserch embedded Linux systems build, including the system components, the typicl hrdwre pltforms, the kernel cutting, the root file system production, etc; Secondly, reserch of mobile communiction technology, including GSM system composition nd GSM in the min ppliction field of logistics informtion; Finlly, reserch rdio frequency identifiction technologies, including RFID system components nd the min technicl. With the development of embedded technology for logistics informtion field grdully mture, The reserch content of this rticle will be bound to get wide rnge of pplictions, to promote the development of logistics industry, to improve the level of logistics industry nd other spects of informtion technology hs gret significnce. Introduction Logistics is to point to meet the needs of customers, t the lowest cost, through trnsport, storge, distribution nd so on, to chieve rw mterils, semi-finished products, finished products or relted informtion from origin of goods to the commodity consumption in the whole process of plnning, implementtion nd mngement. The rpid development of the logistics industry, On the one hnd, in order to ensure the rpid development of the ntionl economy coordintion nd stble, plyed fundmentl role in sfegurding nd supporting. On the other hnd, it lso becme importnt mens in the djustment of industril structure, chnging the mode of economic development nd opening up new economic growth point. Logistics industry, the overll level of informtion technology is reltively bckwrd, unble to dpt to the needs of the rpid expnsion of the scle of the logistics industry, embedded technology is the min technicl to improve the level of informtion logistics industry. Embedded systems is the "control, monitor or ssistive devices, mchines, nd equipment opertion device", is centered on ppliction, bsed on computer technology, softwre nd hrdwre clipping, suitble for ppliction system for function, relibility, cost, volume, power consumption, etc. Strict requirements, dedicted computer system. Embedded Linux is Linux operting system tht by cutting the incresingly populr Linux operting system nd mking it in embedded computer systems running on. Embedded Linux inherits the Internet unlimited open source resources, but lso hs the chrcteristics of embedded operting system [1]. Embedded Linux hs very wide rnge of pplictions, but lso provides powerful flexible solution in logistics informtion field, in order to chieve effective control nd ccelerte logistics opertion. Embedded Linux technology involved lot, in this study only four key technologies. Embedded Linux Systems Build 2.1 Embedded System Components Embedded system is generlly consists of two prts, hrdwre pltform nd softwre pltform, shown in Fig 1. Hrdwre pltform is composed of embedded microcontroller processor nd peripherl hrdwre devices, with the continuous development of chip technology, the embedded processor speeds re The uthors - Published by Atlntis Press 250

2 lso incresing, multiprocessor nd multi-core processor pltform hs lso been grdully pplied in the embedded field, the typicl hrdwre pltform shown in Fig 2. Appliction softwre Operting system Softwre pltform Input Memory Hrdwre pltform Processor Output Fig 1. Embedded system components Clock Reset Interrupt controller Processor core SDRAM Controller Externl bus Controller SDRAM Flsh Other externl devices Fig 2. Typicl embedded hrdwre pltform The softwre pltform is composed of embedded operting system nd ppliction softwre. Appliction softwre running on embedded operting system, when the processor with the MMU (Memory Mngement Unit), cn be seprted from ppliction softwre nd operting system from hrdwre, compiling nd Mngement, Linux using the seprtion mechnism, the dvntges of high system security, the mintinbility is strong, the division of ech function module 2.2 Embedded Linux Kernel Cutting First, the kernel configurtion. Becuse there re mny versions of the kernel, should ccording to the specific processor rchitecture to choose the most suitble kernel version. Once found the pproprite kernel version, unzip it to "$(PRJROOT}/kernel" directory. There re four min methods for the configurtion of the kernel [4]: (1) mke config: Through the commnd interfce, set ech option in turn. (2) mke oldconfig: The configurtion bsed on the originl ".config" configurtion file, only with option is not set previously encountered tht require mnul setting. (3) mke menuconfig: Disply to "curse"-bsed, terminl-style configurtion menu. (4) mke xconfig:disply bsed on Tk "X Windows" menu. Then, compile the kernel. Includes the following three steps: (1) To estblish the dependence of the kernel source code. From the kernel source tree root directory, use "mke" commnd to estblish the dependence of the kernel source code. (2) Set up the kernel imge. Cn indicte "Mkefile" set up "gzip compressed kernel imge, lso cn direct" Mkefile" to estblish n uncompressed kernel imge. (3) Compile the kernel modules. Run "mke" commnd to compile, the generted imge files stored in the "/ rch / rm / boot /" directory, nmed "zimge". Mobile Communiction Technology GSM (Globl System for Mobile Communictions) is Globl stndrd for Mobile Communictions, GSM terminl within the System through the Service Center cn with ny GSM terminl or PSTN network terminl for dt communiction, minly voice, cn provide imges nd dt business [5]. Embedded wireless communiction technology cn use GSM technology or its improvement. 251

3 3.1 GSM System Components GSM system is minly composed of mobile sttion (MS), bse sttion subsystem (BSS) nd network subsystem (NSS), s shown in Fig 3 [6]. Bse sttion subsystem (BSS) by bse trnsceiver sttion (BTS) nd the bse sttion controller (BSC); Network subsystem by the mobile switching center (MSC), opertion nd mintennce center (OMC) nd home loction register (HLR), visit loction register (VLR), uthentiction center (AUC) nd equipment identity register (EIR), etc. NSS BSS BTS MS BSC VLR MSC HLR PSTN ISDN PDN BTS BSC OMC AUC MS EIR Fig 3. GSM system composition Ech component re described below [7]: MS is physicl device, by subscriber identity module (SIM) nd the hrdwre equipment; BTS includes wireless trnsmission needs vriety of hrdwre nd softwre, connection the interfce circuit of BSC nd BTS itself required for testing nd control equipment, etc.; BSC is the BTS nd MSC join points, the min function is crries on the wireless chnnel mngement, the implementtion clls, the communictions link estblished nd removed, nd control the control of the mobile sttion within the inter-district switch; MSC is the core of the cellulr network, the min function is to control in the MSC region of the user communiction control nd mngement; HLR is dtbse storge locl user's loction informtion; VLR is dtbse storge visiting users loction informtion; AUC identifiction of user identity, only llow you hve the right to ccess network nd ccess services; OMC is the control nd opertion of the whole network. 3.2 GSM Min Appliction The embedded technology hs two min pplictions in the field of logistics informtion. (1) Vehicle system. In order to solve the on-bord system nd ground equipment wireless communiction problems, such s lrge mount of dt, slow speed, esy to lost, cn use the embedded wireless dt communiction system [8]. Selects the ARM7 chip, the dt deposited in the FLASH memory chip, then export to seril port by FLASH chips, use the existing network communiction. Not only retin the most commonly used seril port, nd relize the stble dt communiction. (2) Monitoring system. Trditionl monitoring systems monitor nd control centers vi Internet, the public telephone network, or LAN, etc. wired dt trnsmission, constructing the network cost is high, nd the monitor position is restricted by the network interfce, movement is not flexible. With the improvement of the GSM common network, monitoring system uses the existing wireless mobile network for dt trnsmission, low construction cost, convenient monitor mobile, cn chieve rbitrry loction monitoring multiple wrehouse nd crrier. Rdio Frequency Identifiction Technologies Rdio Frequency Identifiction technology (RFID), is non-contct utomtic Identifiction technology, through Rdio Frequency signl utomticlly identify trget nd get the relevnt dt [9,10]. Hs been widely used in industril utomtion, logistics nd trnsporttion mngement, nd other fields, become one of hot topics in the study of the current IT industry technology. 4.1 RFID System Composition 252

4 The most bsic RFID consists of three prts, tg, reder nd ntenn. But in order to mke the dt trnsmission, storge nd hndling of the red, usully RFID lso includes two uxiliry prts, middlewre nd computer system [11]. The system composition structure shown in Fig 4. Energy Reder Antenn Clock Dt Antenn Lbel Middlewre Computer System Fig 4. RFID system components (1) Lbel. Commonly known s n electronic tg, lso clls the trnsponder, composed of tg chip nd the coil, the use of inductive coupling or electromgnetic bckscttering coupling principle to relize communiction with reder. (2) Reder. The red / write opertion of equipment for RFID tgs, including the RF module nd digitl signl processing unit of the two prt, is the most importnt infrstructure in RFID system. (3) Antenn. It is n equipment tht implementtion spce RF signl trnsmission nd estblish wireless connection between the RFID tg nd reder. (4) Middlewre. It is softwre tht ccept requests from ppliction softwre, to specify one or more of the reder fter lunching n opertion, receiving, processing to ppliction returns the result dt. (5) Computer system. Is the informtion mngement center of the RFID system, by hrdwre equipment, network equipment, dtbse mngement systems, softwre systems nd other components. 4.2 The Min Technology Of RFID The RFID ppliction premise, is the key to solve the RFID technology. RFID key technology minly in the following respects [12]: (1) RFID systems integrtion nd dt mngement. RFID nd wireless communictions, sensor networks, informtion security, industril control nd so on the integrtion of technology, RFID uses system of middlewre technology, mss of RFID informtion resources orgniztion, storge, mngement, exchnge, distribution, dt processing nd cross-pltform computing technology (2) RFID detection technology nd specifictions. for different industry pplictions of RFID tgs nd relted physicl fetures nd performnce consistency detection technology nd the specifiction, the ir interfce between tg nd reder conformnce testing technology nd specifiction,s well s system solutions nd comprehensive detection technology nd specifiction. (3) Multi-object recognition technology. When there re multiple tgs within reder signl rnge, the sme time, there re two or more thn two tgs while return informtion to the reder, will led to conflict. Trditionl rdio technology for ir seprtion multiplex, frequency division multiplexing, time division multiplexing method nd code multiplexing method nd other methods to solve the similr problems. (4) Lbel of energy supply. Active tg comes with btteries nd used to power dt crrier; Pssive tgs required energy obtined from the rdio frequency electromgnetic bem. Compred with ctive rdio frequency identifiction system, pssive system requires lrge trnsmission power, rdio frequency electromgnetic wve on the lbel vi rdio frequency (RF) detection, voltge regultor, storge circuit processing, into the tg working voltge needed for the job. (5) The security nd integrity of dt trnsmission. Due to the digitl signl will be disturbed in the process of trnsmission, trnsmitted to the receiving end my occur wrong judgment, in order to ensure the integrity of the dt, cn be used to identify the trnsmission errors using clibrtion method, nd correct opertion. The most commonly used method is prity nd redundncy check. 253

5 Conclusion Embedded Linux is bsed on Linux embedded operting system, is widely used in mobile phones, personl digitl ssistnt (PDA), medi plyer nd mny consumer electronic devices. Embedded Linux hs prcticl significnce to the field of logistics informtion, but hs not been widely pplied. With the continuous development of logistics enterprises nd the embedded technology, embedded technology for logistics informtion sector will grdully become mture. Embedded Linux hs prcticl significnce to the field of logistics informtion, but hs not been widely pplied. With the continuous development of logistics enterprises nd the embedded technology, embedded technology for logistics informtion sector will grdully become mture. Through the utomtic billing, rel-time monitoring, provide vriety of sttisticl informtion, reducing stff, inventory mngement, improve service qulity nd other mens, to optimize business processes, improve logistics efficiency, bring brnd-new mngement ide nd service methods for the logistics industry, relize the mximiztion of enterprise vlue. Especilly logistics digitl nti-counterfeiting system, portble storge inventory mchine hrdwre nd system softwre, logistics utomtion wireless storge informtion system, embedded experimentl logistics system is highly ppliction vlue nd socil vlue, is n importnt reserch direction in the future for period of time. References [1] Bidu Encyclopedi, Embedded Linux, [2] C. Li, J. Xio, "Appliction nd technology of embedded Linux development," Electronic Industry Press, [3] Y. F. Li, W. S. Ou, "ARM Linux embedded system development from entry to the mster," Tsinghu University press, [4] X. Y. Chen, "Constructing Embedded Systems Bsed On Linux," Journl of Longyn University, vol. 25, no. 3, pp , [5] G. Q. Zho, T. Xing, Y. C. Ren, "Reserch on Embedded Extend Key Technology in Logistics Control Field," Computer Knowledge nd Technology, vol. 6, no. 20, pp , [6] Y. Zhng, "Design nd Implementtion of the Embedded Logistics Monitor System Bsed on GSM," Mster s Degree of Jingnn University, [7] Vecuronium electronic mrket, "The min structure of GSM system," [8] Y. Z. Guo, X. Xu, "A design of embedded wireless communiction system nd its reliztion," Enterprise technology development, vol. 28, no. 11, pp. 26, [9] G. Q. Zho, T. Xing, Y. C. Ren, "Appliction of Rdio Frequency Identifiction in Embedded Wrehouse Logistics Mngement," Computer Knowledge nd Technology, vol. 6, no. 19, pp , [10] Bidu Encyclopedi, "RFID," [11]H. Q. Luo, X. W. Xie, "The nlysis of the key technology of RFID network," [12] L. Y. Ho, J. P. Zho, Q. X. Liu, "The Key Technology of RFID nd Its Use in the Mnge of the Students," Modern Eduction Technology, vol. 17, no. 1, pp ,