毕业论文外文翻译-通用分组无线服务GPRS.doc

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1、大连科技学院2013届本科生毕业设计（论文）外文翻译大连交通大学信息工程学院毕业设计(论文)外文翻译学生姓名 专业班级 信息工程09-2班 指导教师 职 称 所在单位 电气工程系信息工程教研室 教研室主任 完成日期 2013 年 4 月 15 日13GPRS1 GPRS OverviewGPRS is the General Packet Radio Service English abbreviations, for General grouping wireless business in Chinese, is a kind of wireless Packet switching te

2、chnology based on GSM system, provides end-to-end, wide-area wireless IP connection. Relatively original GSM dial-up way way of circuit-switched data transmission, GPRS is packet switching technology, has a real-time online, volume pricing and quick login, high speed transmission and freely switch.

3、Informally, GPRS is a high-speed data processing technology, the method is in the form of group send data to the users hands. Although GPRS as the existing GSM network to make the transition to the third generation mobile communication technology, but it has a significant advantage in many ways.Due

4、to the use of the group technology, Internet users relative stability, to avoid the unnecessary short-term bring trouble. In addition, the use of GPRS Internet method is different from a WAP, with WAP web site like online at home, dial-up first, and on the Internet and cant use the phone line at the

5、 same time, the GPRS download materials and can simultaneously. Technically, the transmission of sound (voice) continue to use the GSM, and can use the GPRS data transmission, in this way, the mobile phone application to promote to a higher level. Development of GPRS technology is economy, because o

6、nly need to use the existing GSM network. GPRS usage is very extensive, including through the mobile phone to send and receive E-mail, browsing on the Internet, etc.GPRS and past continuous in the channel transmission in different ways, to transmit the Packet (Packet) tense, so the burden of cost ca

7、lculation is based on the transmission data unit, not to use its entire channels, theoretically cheaper. GPRS transmission rate can be up to 56 or 114 KBPS.2 An essential part of the GPRS(1) Packet control unit (PCU) : mainly used for the completion of RLC/MAC function with the Gb interface and tran

8、sformation. PCU in physical implementation can have three ways: PCU Settings in the BTS; PCU is set in the BTS; PCU independent setting, A physical entity (contain multiple PCU unit) likely connected to multiple BSC, equipped with the base station subsystem of PCU send packet business through the Gb

9、 interface to SGSN, send via A voice service interface to MSC.(2) Service GPRS support node (SGSN) : perform the function of mobility management, security and access control and routing, and other functions. Between the SGSN and HLR Gr interface used in the SGSN and HLR passed between mobility manag

10、ement of related signaling. SGSN and SMS - GMSC/SMS - IWMSC between Gd interface is used to send short message service via GPRS. Between MSC/VLR and SGSN Gs interface used in the SGSN cooperate with MSC/VLR implementation such as joint location updates, via GPRS for CS paging, etc.(3) Gateway GPRS s

11、upport node (GGSN) : responsible for providing GPRS PLMN and outer packet data network interface, and provide the necessary network security mechanisms (such as a firewall). Between the GGSN and HLR Gc interface as optional interface, is used to contact the HLR GGSN MS routing information. The SGSN

12、and GGSN can be set independently, can also be fellow. The same PLMN by designed.the Gn interfaces for communication between the GSN, different PLMN by Gp interface for communication between the GSN.(4) Border gateway (BG) : border gateway for PLMN interconnection between the GPRS backbone, it shoul

13、d have basic security function, moreover can also according to the roaming agreements between operators increase the related functions. Border gateway can be independent of the physical entity, can also with the GGSN fellow.(5) Billing gateway (CG) : charging gateway through Ga interface and GPRS ne

14、twork entities such as GSN communication, used to collect the GSN send billing data records and billing.(6) Domain name server (DNS) : responsible for providing internal SGSN and GGSN GPRS network nodes of DNS and parse the APN.(7) Mobile station (MS) : A user using the equipment, according to the f

15、unction can be divided into A, B, C three types, by the mobile terminal (MT) and terminal equipment (TE).(8) LIG: lawful intercept gateway, collect information of GPRS users, transmitted to the monitoring agency.(9) Other equipment: BTS, BSC, HLR, MSC/VLR, SMS - GMSC/SMS - IWMSC must be extended to

16、support GSM, such as original equipment associated with the GPRS function. The definition and function reference 900/1800 MHZ TDMA digital public land honeycomb mobile communication network technology system. In a basic network, GPRS base station subsystem can be through the frame relay network are

17、connected to the SGSN, E1 leased line. SGSN and GGSN, BG, CG, DNS, etc. The core network entity is through the IP transmission network signaling and data transmission. In addition, in the core network, SGSN and HLR, MSC/VLR, short message center and GGSN to no. 7 signaling network and HLR to communi

18、cate.3 GPRS service typeAccording to the types of services provided by, now some GPRS Class types have A, B, C three types:(1) Class A can on the Internet of answering the phone at the same time, the technical means and support package exchange (data) and the circuit exchange (voice).(2) Class B can

19、 go online and answer the phone, but not at the same time, the technical means, while also supporting circuit switching and packet switching, but at the same time.(3) Class C can only access to the Internet, when it cant make a phone call, its technology means that it only supports packet switching.

20、 So far, the only Class B type I know mobile phone, that is to say, it can be either GPRS Internet, also can make a phone call, but not simultaneously.But my reasoning is that GPRS service type of the Class is not entirely determined by the phone, but need to GPRS network operators to provide corresponding service to proceed. They are cooperate with each other and interdependent relationship.4 The working principle of GPRSGPRS English fu