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<TD borderColor=#6699ff><FONT
size=2>您的位置：技术园地>技术讲座-GSM蜂窝移动通信系统 </FONT></TD></TR>
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<DIV align=center><FONT size=4><B><SPAN
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lang=EN-US>第四讲 GSM网络结构</SPAN></SPAN></B></FONT></DIV></TD></TR>
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size=3><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
face=楷体_GB2312 color=#000066>我国<SPAN
lang=EN-US>GSM数字移动通信网是采用独立网号方式来组网的。它与PSTN、ISDN、<BR>PSPDN以及现有模拟PLMN之间的关系见图4-1所示。</SPAN></FONT></SPAN><FONT
face=楷体_GB2312 color=#000066><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'">中国电信</SPAN><SPAN
lang=EN-US style="mso-ascii-font-family: 宋体">”</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">GSM网路接<BR>入号为</SPAN><SPAN
lang=EN-US style="mso-ascii-font-family: 宋体">“</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">139</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'">，</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'">中国联通</SPAN><SPAN
lang=EN-US style="mso-ascii-font-family: 宋体">”</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">GSM网路接入号为</SPAN><SPAN
lang=EN-US style="mso-ascii-font-family: 宋体">“</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">130</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'">。</SPAN></FONT><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></FONT></P>
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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>4-1
GSM网路与其它网路间的关系<O:P> </O:P></SPAN></FONT><FONT face=楷体_GB2312
size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT><FONT
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size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT></SPAN></P>
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size=3> <O:P> </O:P></FONT></SPAN></P>
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size=3><SPAN style="mso-spacerun: yes"> </SPAN><B><SPAN
style="mso-spacerun: yes"> </SPAN><A name=b1>4.1
全国GSM移动通信网的网路结构<O:P> </A></O:P></B></FONT></SPAN></P>
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style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-ALIGN: justify"><FONT
size=3><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN><FONT
face=楷体_GB2312
color=#000066>全国GSM移动电话网按大区设立一级汇接中心、省内设立二级汇接中心、移动业务本地网设立端局构成三级网路结构。它与PSTN网(公用电话网)的连接关系参见图4-2。从图中可见，三级网路结构组成了一个完全独立的数字移动通信网路。而模拟移动通信网路结构是与PSTN网混合方式来组建的(它与PSTN网的连接关系可见图4-3)，它在省内建立二级汇接中心，在移动业务本地网内建端局，无一级汇接中心，省际间的通信是借助于PSTN网的长途电话网来实现，当然为实现省际间的自动漫游，模拟移动电话网必须建立自己的全国信令网。另外，模拟移动通信网是采用PSTN网的端局号方式接入，以</FONT></SPAN><FONT
face=楷体_GB2312 color=#000066><SPAN lang=EN-US
style="mso-ascii-font-family: 宋体">“</SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">9</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'">字头为标志，因此可以说模拟移动通信网是<SPAN
lang=EN-US>PSTN网的一部分，而GSM数字移动通信网与PSTN网相重叠。当然，公用电话网还有它的国际出口局，而GSM数字移动通信网却无国际出口局，国际间的通信仍然还需借助于公用电话网的国际局。</SPAN></SPAN></FONT><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><SPAN
lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN></SPAN></FONT></P>
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<IMG height=194 src="g4-1-2-3.files/g4-1-213.gif" width=277
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align=center><SPAN
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>4-2
GSM网路与PSTN网路连接示意图<O:P> </O:P></SPAN></FONT><FONT face=楷体_GB2312
size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT><FONT
face=楷体_GB2312 size=3><SPAN
lang=EN-US><O:P></O:P></SPAN></FONT><FONT size=3><SPAN
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size=3><IMG height=181
src="g4-1-2-3.files/g4-1-214.gif" width=277
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align=center><SPAN
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>4-3
模拟移动通信网与PSTN网路连接示意图<O:P> </O:P></SPAN></FONT><FONT face=楷体_GB2312
size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT><FONT
face=楷体_GB2312 size=3><SPAN
lang=EN-US><O:P></O:P></SPAN></FONT><FONT size=3><SPAN
lang=EN-US><O:P></O:P></SPAN></FONT></SPAN></P>
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align=center><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px"
align=center><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><FONT
size=3><SPAN lang=EN-US style="mso-ascii-font-family: 宋体"><FONT
face=楷体_GB2312 color=#000066>“</FONT></SPAN><FONT face=楷体_GB2312
color=#000066><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">中国联通</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'">的<SPAN
lang=EN-US>GSM移动通信网与邮电部门的GSM移动通信网和PSTN网(称公用通信主网，简称主网)之间的网路结构见图4-4。在</SPAN></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'">中国联通</SPAN><SPAN
lang=EN-US style="mso-ascii-font-family: 宋体">”</SPAN><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'">GSM移动交换局所在地，联通网和主网之间各设一个网间接口局，双方接口局按一对一的方式成对互连。联通GSM客户与主网GSM、PSTN客户间的各种业务互通(含本地、自动长途、移动及国际业务等)所需的话路接续和信号，均经过网间接口局连通。</SPAN></FONT><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><O:P>
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