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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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style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><B><FONT
size=3>4.4 信令网路结构<O:P> </O:P></FONT></B></SPAN></P>
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style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
face=楷体_GB2312 color=#000066 size=3>在建网初期，由于国内的<SPAN
lang=EN-US>No.7信令网不适宜传输MAP消息，作为过渡，可先建立<BR>移动专用No.7信令网。网路结构仍采用三级结构(见图4-8)：</SPAN></FONT><FONT
size=3><SPAN lang=EN-US><O:P> </O:P></SPAN></FONT></SPAN></P>
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face=楷体_GB2312 color=#000066 size=3>第一级为最高级，称高级信令转接点<SPAN
lang=EN-US>(HSTP)；<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"><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
face=楷体_GB2312 color=#000066 size=3>第二级为低级信令转接点<SPAN
lang=EN-US>(LSTP)；第三级为信令点(SP)。<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>
<P class=MsoNormal
style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
face=楷体_GB2312 color=#000066 size=3>移动通信网的专用高级信令转接点<SPAN
lang=EN-US>(HSTP)设置在大区一级移动业务汇接中心，专用的低级信令转接点(LSTP)设置在各省二级移动业务汇接中心，移动业务本地网中的每个MSC／VLR、EIR、HLR／AUC、SCH和BSC设置信令点。<O:P>
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<IMG height=159 src="g4-4.files/g4-4.H19.gif" width=266
v:shapes="_x0000_i1025"><O:P> </O:P></FONT></SPAN></P>
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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>4-8<SPAN
style="mso-spacerun: yes"> </SPAN>GSM信令网结构图<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
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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 lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
size=3> <O:P> </O:P></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21pt; TEXT-ALIGN: justify; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'"><FONT
face=楷体_GB2312 color=#000066 size=3>各大区只设置一个专用<SPAN
lang=EN-US>HSTP，呈单星型结构，HSTP之间以网状网互连。各省专用LSTP连接到本大区中心的专用HSTP上，LSTP间一般不直接相连。各移动业务本地网的SP点至少应连接到本省的2个LSTP点上，LSTP根据业务量可单独设置或合设在省内二级汇接中心内。图4-9表示了我国邮电部门近期数字移动通信网的信令网结构示意图。</SPAN></FONT><FONT
size=3><SPAN lang=EN-US><O:P> </O:P></SPAN></FONT></SPAN></P>
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