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标题: 如何降低TCH掉话率3  [查看完整版帖子] [打印本页]
时间:  2007-11-15 17:44
作者: lily6189     标题: 如何降低TCH掉话率3



<p class="MsoNormalIndent" style="margin-left: 18pt; text-indent: -18pt;"><!--Element not supported - Type: 8 Name: #comment--><strong><span lang="EN-US" style="font-size: 12pt;">2、</span></strong><!--Element not supported - Type: 8 Name: #comment--><strong><span style="font-size: 12pt; font-family: 宋体;">路测</span></strong><strong><span lang="EN-US" style="font-size: 12pt;"><op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 18pt;"><strong><span style="font-size: 10.5pt;">在路测过程中，我们可以看到接收电平的确太低的区域，同时也可以观察到越区覆盖的小区以及切换关系定义不全，切换延迟导致的孤岛，以便及时处理。<span lang="EN-US"><op></op></span></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 18pt; text-indent: -18pt;"><!--Element not supported - Type: 8 Name: #comment--><strong><span lang="EN-US">3、</span></strong><!--Element not supported - Type: 8 Name: #comment--><strong><span>用户投诉<span lang="EN-US"><op></op></span></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 18pt;"><strong><span style="font-size: 10.5pt;">一般来说，在路测过程中，我们可以基本了解到室外覆盖的情况，但是对于室内覆盖的信息主要来源于用户的投诉。<span lang="EN-US"><op></op></span></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 21pt;"><strong><span lang="EN-US"><!--Element not supported - Type: 8 Name: #comment--> <!--Element not supported - Type: 8 Name: #comment--><op></op></span></strong></p>

<h3><span lang="EN-US" style="font-size: 12pt; font-family: 宋体;">2.2.2<span>   </span>覆盖的</span><span style="font-size: 12pt; font-family: 宋体;">解决</span><span lang="EN-US" style="font-size: 12pt;"><op></op></span></h3>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span>1、根据路测结果，调整网络参数。网络参数主要包括工程参数和小区参数两部份。我们可以通过调整天线的下倾角、方向角、天线挂高来调整小区的覆盖；在小区参数方面，我们可以通过调整手机最小接入电平（RXLEVAMI）、基站发射功率、切换候选小区最小接入门限（RXLEVMIN）、小区相邻关系等参数来调整覆盖。<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-family: 黑体;"><span>  </span></span></strong><strong><span lang="EN-US" style="font-size: 10.5pt;">2、增加基站。<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-family: 黑体;"><span> </span><span>   </span><op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 56.25pt; text-indent: -48pt;"><!--Element not supported - Type: 8 Name: #comment--><b><span lang="EN-US" style="font-size: 14pt; font-family: Arial;">2.2<span style="font-family: &quot;Times New Roman&quot;; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">                  
</span></span></b><!--Element not supported - Type: 8 Name: #comment--><b><span style="font-size: 14pt; font-family: 黑体;">切换不合理</span></b><b><span lang="EN-US" style="font-size: 14pt; font-family: Arial;"><op></op></span></b></p>

<p class="MsoNormal"><strong><span lang="EN-US"><span>           </span></span></strong><strong><span style="font-family: 宋体;">切换不合理主要包括相邻小区的规划不合理以及切换的参数定义不合理，他是影响掉话率高的重要原因之一，我们可以通过</span></strong><strong><b><span lang="EN-US" style="font-family: Arial;">Unsuccessful Internal Handovers,
Intracell, with Loss of MS</span></b></strong><strong><b><span style="font-family: 宋体;">和</span></b></strong><strong><b><span lang="EN-US" style="font-family: Arial;">Unsuccessful
Internal Handovers, Intercell, with Loss of MS(UNIHIRLC)</span></b></strong><strong><span style="font-family: 宋体;">来定位掉话率高是否因切换引起。</span></strong><strong><span lang="EN-US" style="font-family: Arial;"><op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 56.25pt;"><span style="font-size: 10.5pt;">对于切换的分析我们主要是通过话统分析以及路测来解决。</span><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;"><op></op></span></p>

<h3><span lang="EN-US" style="font-size: 12pt;">2.3.1 <span>   </span></span><span style="font-size: 12pt; font-family: 宋体;">切换不合理的定位</span><span lang="EN-US" style="font-size: 12pt;"><op></op></span></h3>

<p class="MsoBodyTextFirstIndent" style="margin-left: 18pt; text-indent: -18pt;"><!--Element not supported - Type: 8 Name: #comment--><span lang="EN-US">1、</span><!--Element not supported - Type: 8 Name: #comment-->话统分析</p>

<p class="MsoBodyTextFirstIndent"><span lang="EN-US">1）</span><strong><span style="font-size: 10.5pt;">在</span></strong><strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">Attempted
Outgoing Internal Intercell Handovers per Target Cell<op></op></span></b></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">(AOUINIRH) </span></b></strong><strong><b><span style="font-size: 10.5pt;">和</span></b></strong><strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">Successful
Outgoing Internal Intercell Handovers per Target Cell<op></op></span></b></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">(SOUINIRH)</span></b></strong><strong><span style="font-size: 10.5pt;">中定义了到某个邻区的切换成功率，我们可以找出到哪个小区的成功率低，进一步从目标小区查找原因。<span lang="EN-US"><op></op></span></span></strong></p>

<p class="MsoNormal"><span lang="EN-US" style="font-family: 宋体;">2）</span><strong><b><span style="font-family: Arial;">
                                </span></b></strong><strong><span style="font-family: 宋体;">在</span></strong><strong><b><span lang="EN-US" style="font-family: Arial;">Attempted Incoming Internal Intercell
Handovers per Originating Cell (AININIRH)</span></b></strong><strong><b><span style="font-family: 宋体;">和</span></b></strong><strong><b><span lang="EN-US" style="font-family: Arial;">Successful Incoming Internal Intercell
Handovers per OriginatingCell (SININIRH)</span></b></strong><strong><span style="font-family: 宋体;">中定义了相邻小区到本小区的切换成功率，如果哪个小区到本小区的成功率低，可能是对方参数设置不合理。</span></strong><strong><b><span lang="EN-US" style="font-family: Arial;"><op></op></span></b></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 18pt; text-indent: -18pt;"><!--Element not supported - Type: 8 Name: #comment--><strong><span lang="EN-US" style="font-size: 10.5pt;">3）<span style="font-family: &quot;Times New Roman&quot;; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">  </span></span></strong><!--Element not supported - Type: 8 Name: #comment--><strong><span style="font-size: 10.5pt;">如果切换次数与<span lang="EN-US">TCH呼叫占用成功次数不成比例（切换/呼叫＞3），可以初步判断切换参数设置不合理。<op></op></span></span></strong></p>

<p class="MsoNormal"><strong><span lang="EN-US" style="font-size: 12pt; font-family: 宋体;"><!--Element not supported - Type: 8 Name: #comment--> <!--Element not supported - Type: 8 Name: #comment--><op></op></span></strong></p>

<p class="MsoNormal" style="margin-left: 18pt; text-indent: -18pt;"><!--Element not supported - Type: 8 Name: #comment--><strong><span lang="EN-US" style="font-size: 12pt; font-family: 宋体;">2、</span></strong><!--Element not supported - Type: 8 Name: #comment--><strong><span style="font-size: 12pt; font-family: 宋体;">路测<span lang="EN-US"><op></op></span></span></strong></p>

<p class="MsoNormal" style="margin-left: 18pt;"><strong><span lang="EN-US" style="font-family: 宋体;"><span>    </span>在路测过程中，我们可以仔细观察切换是否延迟、是否有乒乓切换以及切换后立即掉话现象，然后再根据具体情况分析原因，是因为参数设置不合理还是小区相邻关系定义不全。<op></op></span></strong></p>

<h3 style="margin-left: 47.2pt; text-indent: -40.5pt;"><!--Element not supported - Type: 8 Name: #comment--><strong><span lang="EN-US" style="font-size: 12pt; font-family: 宋体;">2.3.2<span style="font-family: &quot;Times New Roman&quot;; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">    
</span></span></strong><!--Element not supported - Type: 8 Name: #comment--><span style="font-size: 12pt; font-family: 宋体;">切换不合理的解决</span><strong><span lang="EN-US" style="font-size: 12pt; font-family: 宋体;">
<op></op></span></strong></h3>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span>  </span>1、合理增加或减少邻区<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-family: 黑体;"><span>     </span></span></strong><strong><span style="font-size: 10.5pt;">根据具体情况增加或减少邻区，如果某邻区信号不是很稳，只是某时突发信号较强，为了避免信号突然下降引起切换失败导致掉话，可以根据实际情况剔掉该邻区。<span lang="EN-US"><op></op></span></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span><op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span>2、调整切换参数<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent" style="margin-left: 18pt;"><strong><span style="font-size: 10.5pt;">调整切换参数主要包括调整上下行电平切换门限<span lang="EN-US">(</span></span></strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">HOLTHLVUL</span></b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">/ <b>HOLTHLVDL)</b></span><strong><span style="font-size: 10.5pt;">、上下行质量切换门限<span lang="EN-US">(</span></span></strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">HOLTHQUUL
/HOLTHQUDL)</span></b><strong><span style="font-size: 10.5pt;">、切换候选小区的接收电平</span></strong><strong><b><span style="font-size: 10.5pt;">（</span></b></strong><strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">RXLEVMIN</span></b></strong><strong><b><span style="font-size: 10.5pt;">）</span></b></strong><strong><span style="font-size: 10.5pt;">、<span lang="EN-US">BGT切换门限</span></span></strong><strong><b><span style="font-size: 10.5pt;">（</span></b></strong><strong><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">BGTHO</span></b></strong><strong><b><span style="font-size: 10.5pt;">）</span></b></strong><strong><span style="font-size: 10.5pt;">等，为了提高上下行电平切换成功率，我们可以提高上下行电平切换门限或提高切换候选小区的接收电平</span></strong><strong><span style="font-size: 10.5pt;">。<span lang="EN-US"><op></op></span></span></strong></p>

<h2><span lang="EN-US" style="font-size: 14pt;">2.4<span>  </span></span><span style="font-size: 14pt; font-family: 黑体;">上下行不平衡</span><span lang="EN-US" style="font-size: 14pt;"><op></op></span></h2>

<p class="MsoNormal" style="margin: 4pt 0cm 4pt 3cm; line-height: 150%;"><span style="font-family: 宋体;">上下行不平衡的情况很多，一般来说，上行信号普遍比下行信号差，如果上下行严重的不平衡，会引起掉话率上升。例如手机当前在</span><span lang="EN-US">CELL1</span><span style="font-family: 宋体;">小区，它的邻区</span><span lang="EN-US">CELL2</span><span style="font-family: 宋体;">存在上下行不平衡（假设是下行很好，但上行已很弱）。那么手机根据下行信号电平进行切换候选小区排序，也许会切进</span><span lang="EN-US">CELL2</span><span style="font-family: 宋体;">，但切过去以后，可能会因为上行太差而导致掉话。</span></p>

<h3><span lang="EN-US" style="font-size: 12pt;">2.4.1<span>  </span></span><span style="font-size: 12pt; font-family: 宋体;">上下行不平衡的定位方法</span><span lang="EN-US" style="font-size: 12pt;"><op></op></span></h3>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-family: 黑体;"><span> </span></span></strong><span lang="EN-US" style="font-size: 10.5pt;">1）在</span><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">ower
and Quality Measurements on Uplink/Downlink Busy TCHs<op></op></span></b></p>

<p class="MsoBodyTextFirstIndent"><b><span lang="EN-US" style="font-size: 10.5pt; font-family: Arial;">(PWRUPDW)</span></b><span style="font-size: 10.5pt;">中，定义了忙时上行接收电平<span lang="EN-US">/接收质量以及下行接收电平/接收质量的情况，我们可以分析上下行平均接收电平来定位上下行是否平衡。<op></op></span></span></p>

<p class="MsoBodyTextFirstIndent"><span lang="EN-US" style="font-size: 10.5pt;">2）如果上行电平切换请求次数比下行电平切换请求次数多很多，说明上行信号比下行信号差。<op></op></span></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt; font-family: 黑体;">3）</span></strong><strong><span style="font-size: 10.5pt;">检查塔放和功放，看是否有这方面的告警，如果有告警，可能会导致上行信号比下行信号差。当天馈有驻波比告警或合路器有告警时，会导致下行信号比上行信号差。<span lang="EN-US"><op></op></span></span></strong></p>

<h3><span lang="EN-US" style="font-size: 12pt;">2.4.2<span>  </span></span><span style="font-size: 12pt; font-family: 宋体;">上下行不平衡的解决方法</span><span lang="EN-US" style="font-size: 12pt;"><op></op></span></h3>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-family: 黑体;"><span> </span></span></strong><strong><span lang="EN-US" style="font-size: 10.5pt;">1）检查塔放和功放、天馈、合路器等，并检查告警情况综合判断。<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span>2）<span>    </span>检查基站的天线方向与设计的方向是否符合。如果分集接收天线接反，会导致天线的分集接收增益大大减少，从而引起上行信号比下行信号差。<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span>3）<span>    </span>观察MA10测量报告。<op></op></span></strong></p>

<p class="MsoBodyTextFirstIndent"><strong><span style="font-size: 10.5pt;">检查<span lang="EN-US">BSC数据配置（手机、基站发射功率，手机最小接入电平）。<op></op></span></span></strong></p>

<p class="MsoBodyTextFirstIndent"><span lang="EN-US" style="font-size: 10.5pt;"><span> </span><op></op></span></p>

<h2 align="left" style="text-align: left;"><span lang="EN-US" style="font-size: 14pt; font-family: 宋体;">2.5 设备问题<op></op></span></h2>

<p class="MsoNormalIndent" style="text-indent: 0cm;"><span lang="EN-US"><span>      </span></span><span style="font-family: 宋体;">设备问题主要指载频板、功放、塔放的故障，这些设备故障会导致掉话率上升。</span></p>

<h3><span lang="EN-US" style="font-size: 12pt;">2.5.1<span>  </span></span><span style="font-size: 12pt; font-family: 宋体;">问题定位</span><span lang="EN-US" style="font-size: 12pt;"><op></op></span></h3>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span>1）如果从话统中看到TCH可用率异常，则该小区可能有部分设备故障。<op></op></span></strong></p>

<p align="left" class="MsoBodyTextFirstIndent" style="text-align: left;"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span> </span>2）<span>    </span>若该小区的掉话率和拥塞率一直很高，则该小区可能有部分设备故障。<op></op></span></strong></p>

<h3><span lang="EN-US" style="font-size: 12pt;">2.5.2<span>  </span></span><span style="font-size: 12pt; font-family: 宋体;">问题解决</span><span lang="EN-US" style="font-size: 12pt;"><op></op></span></h3>

<p class="MsoBodyTextFirstIndent"><strong><span lang="EN-US" style="font-size: 10.5pt;"><span>    </span>观察传输和单板告警（TRAU故障，A接口PCM失步告警，LAPD断链，CU板告警），根据告警数据，
分析是否传输断或有故障单板存在（如载频板坏或接触不良）。<op></op></span></strong></p>

时间:  2009-2-17 20:12
作者: zyj200467

时间:  2009-3-10 09:30
作者: onlyjim

谢谢！
时间:  2009-3-10 09:33
作者: onlyjim





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