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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 color=#000080 size=5><B><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">第八讲</SPAN><SPAN
lang=EN-US style="mso-spacerun: yes"> </SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">呼叫处理</SPAN></B><SPAN
lang=EN-US><SPAN
style="mso-spacerun: yes"> (7-8-9) </SPAN></SPAN></FONT><FONT
size=4></FONT></DIV></TD></TR>
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<P class=MsoNormal
style="TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><B><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><A name="7.7 MS主叫">8.7
MS主叫</A></SPAN></B></P>
<P class=MsoNormal
style="TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><FONT
color=#000066>若一MS处于激活且空闲状态，客户A 要建立一个呼叫，他只要拨被叫<BR>B
客户号码，再按“发送”键，MS便开始启动程序。</FONT></P>
<P class=MsoNormal
style="TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><FONT
color=#000066>首先，MS通过随机接入控制信道（RACH)向网路发第一条消息，既接入请求消息，MSC会分配它一专用信道，查看A客户的类别并标注此客户忙。若网路容许此MS接入网路，则MSC发证实接入请求消息。</FONT></P>
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color=#000066>接着，MS发呼叫建立消息及B客户号码，MSC根据此号码将主叫与被叫所在MSC连通，并将被叫号码送至被叫所在MSC（B客户为移动客户时）或送入固定网（PSTN)转界交换机（B客户为固定客户时）中进行分析。</FONT></P>
<P class=MsoNormal
style="TEXT-INDENT: 21.75pt; LINE-HEIGHT: 150%"><FONT
color=#000066>一旦通往B客户的链路准备好，网路便向MS发呼叫建立证实，并给它分配专用业务信道TCH。至此，呼叫建立过程基本完成，MS等待B客户的证实信号。 </FONT></P>
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color=#000066><B><SPAN lang=EN-US style="FONT-SIZE: 12pt"><A
name="7.8 MS被叫">8.8<SPAN style="mso-spacerun: yes">
</SPAN>MS</A></SPAN><A name="7.8 MS被叫"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">被叫</SPAN></A><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P>
</O:P></SPAN></B></FONT></P>
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color=#000066><SPAN lang=EN-US
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">若</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">MS</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">作被叫，以</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">PSTN</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的固定客户</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">A</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">呼叫</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">GSM</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的移动客户</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">B</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的呼叫建立过程</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">, </SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">如</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">8</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">13</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt">B</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">客户号码为</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt">139H<SUB>l</SUB>H<SUB>2</SUB>H<SUB>3</SUB>ABCD</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><O:P> </O:P></SPAN></FONT></P>
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style="FONT-SIZE: 12pt"> <IMG height=264
src="g8-7-8-9.files/t7-13.gif" width=500 border=0><O:P>
</O:P></SPAN></FONT></P>
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