g3-11.htm

介绍移动通信gsm原理的书籍

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            style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT 
            face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>3-42<SPAN 
            style="mso-spacerun: yes">&nbsp; </SPAN>设备识别<O:P> 
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            size=3>&nbsp;<O:P> </O:P></FONT></SPAN></P>
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            color=#000066>何时需要设备识别取决于网路运营者。目前我国大部分省市的GSM网路均未配置此设备(EIR)，所以此保护措施也末采用。<O:P> 
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            size=3>&nbsp;<O:P> </O:P></FONT></SPAN></P>
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            size=3><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
            </SPAN><FONT color=#0000cc>(5) 临时识别码(TMSI)<O:P> 
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            style="mso-spacerun: yes"><FONT size=3>&nbsp;&nbsp;&nbsp; 
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            size=3>临时识别码的设置是为了防止非法个人或团体通过监听无线路径上的信令交换而窃得移动客户真实的客户识别码(IMSI)或跟踪移动客户的位置。<O:P> 
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            color=#000066>客户临时识别码(TMSI)是由MSC／VLR分配，并不断地进行更换，更换周期由网路运营者设置。更换的频次越快，起到的保密性越好，但对客户的SIM卡寿命有影响。</FONT><O:P> 
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            face=楷体_GB2312 color=#000066 size=3>客户识别码保密程序见图<SPAN 
            lang=EN-US>3-43，每当MS用IMSI向系统请求位置更新、呼叫尝试或业务激活时，MSC／VLR对它进行鉴权。允许接入网路后，MSC／VLR产生一个新的TMSI，通过给IMSI分配<SPAN 
            style="mso-spacerun: yes">&nbsp; </SPAN>图3-43<SPAN 
            style="mso-spacerun: yes">&nbsp; 
            </SPAN>位置更新TMIS的命令将其传送给移动台，写入客户SIM卡。此后，MSC／VLR和MS之间的命令交换就使用TMIS，客户实际的识别码IMSI便不再在无线路径上传送。<O:P> 
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            size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            <IMG height=205 src="g3-11.files/g3-11.9.gif" width=305 
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            style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT 
            face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>3-43 位置更新<O:P> 
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            size=3><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
            </SPAN><FONT color=#0000cc>(6) PIN码<O:P> 
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            color=#000066>在GSM系统中，客户签约等信息均被记录在一个客户识别模块(SIM)中，此模块称作客户卡。客户卡插到某个GSM终端设备中，便视作自己的电话机，通话的计费帐单便记录在此客户卡户名下。为防止帐单上产生讹误计费，保证入局呼叫被正确传送，在SIM卡上设置了PIN码操作(类似计算机上的Password功能)。PIN码是由4～8位数字组成，其位数由客户自己决定。如客户输入了一个错误的PIN码，它会给客户一个提示，重新输入，若连续3次输入错误，SIM 
            卡就被闭锁，即使将SIM卡拔出或关掉手机电源也无济于事。闭锁后，还有个</FONT></SPAN><FONT 
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            style="mso-ascii-font-family: 宋体">“</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">个人解锁码</SPAN><SPAN 
            lang=EN-US style="mso-ascii-font-family: 宋体">”</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">，是由<SPAN 
            lang=EN-US>8位数字组成的，若连续l0次输入错<SPAN style="mso-spacerun: yes">&nbsp; 
            </SPAN>误，SIM卡将再一次闭锁，这时只有到SIM卡管理中心，由SIM卡业务激活器予以解决。<O:P> 
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