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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>4-4
联通GSM与主网PSTN/GSM网路间互通组网方式示意图<O:P> </O:P></SPAN></FONT></SPAN></P>
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size=3><A name=b2>4.2 省内GSM移动通信网的网路结构</A><O:P>
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face=楷体_GB2312 color=#000066 size=3>省内<SPAN
lang=EN-US>GSM移动通信网由省内的各移动业务本地网构成，省内设若干个移动业务汇接中心(即二级汇接中心)，汇接中心之间为网球网结构，汇接中心与移动端局之间成星状网。根据业务量的大小，二级汇接中心可以是单独设置的汇接中心(即不带客户，全有至基站接口，只作汇接)，也可兼作移动端局(与基站相连，可带客户)。省内GSM移动通信网中一般设置二三个移动汇接局较为适宜，最多不超过四个，每个移动端局至少应与省内两个二级汇接中心相连，见图4-5所示。任意两个移动交换局之间若有较大业务量时，可建立话音专线。</SPAN></FONT><FONT
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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>4-5
省内GSM移动通信网络结构示意图<O:P> </O:P></SPAN></FONT><FONT face=楷体_GB2312
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size=3><A name=b3>4.3 移动业务本地网的网路结构</A><O:P>
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size=3>全国可划分为若干个移动业务本地网，划分的原则是长途区号为<SPAN
lang=EN-US>2位或3位的地区为一个移动业务本地网。每个移动业务本地网中应设立一个HLR(必要时可增设HLR，HLR可以是有物理实体的，也可是虚拟的，即几个移动业务本地网公用同一个物理实体HLR，HLR内部划分成若干个区域，每个移动业务本地网用一个区域，由一个业务终端来管理，见图4-6)和一个或若干个移动业务交换中心(MSC)，
还可以几个移动业务本地网共用一个MSC，见图4-7。<SPAN
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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>4-6 <SPAN
style="mso-spacerun: yes"> </SPAN>虚拟HLR的实现框图<O:P>
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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>4-7
GSM移动业务本地网结构示意图<O:P> </O:P></SPAN></FONT><FONT face=楷体_GB2312
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</SPAN><FONT face=楷体_GB2312
color=#000066>在移动业务本地网中，每个MSC与局所在地的长途局相连，并与局所在地的市话汇接局相连。在长途多局制地区，MSC应与该地区的高级长途局相连。在没有市话汇接局或话务量足够大的情况下，MSC亦可与本地市话端局相连。当一个MSC覆盖几个长途编号区时，该MSC亦可和这几个长途编号区的市话汇接局和长途局相连。<O:P>
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</SPAN>每个MSC均为数字移动通信网的入口局，入口局具有为移动终端的呼叫询问呼叫路由的功能和为呼叫选路至它们终端的目的地---被叫移动台的功能。</FONT></SPAN></FONT></P>
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