通信人家园

标题: 为什么ISCP过高的原因？ [查看完整版帖子] [打印本页]

时间: 2011-10-14 14:52

作者: andrew1020 标题: 为什么ISCP过高的原因？

ISCP过高一个是外部干扰一个是内部干扰
可是现场我们扫频没有发现外部干扰情况
但是也没发现GPS跑偏情况哪个大侠知道该怎么搞？？？谢谢！

时间: 2012-5-8 14:00

作者: htyjump

<font size=\"3\"><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">提取</span><span lang=EN-US>ISCP</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">（</span><span lang=EN-US>UPPCH</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">、</span><span lang=EN-US>TS1</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">、</span><span lang=EN-US>TS2</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">）值查看是否存在干扰，并排查网外干扰和网内干扰。</span></font>

<font size=\"3\"><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">网外干扰：表现为全时段全频段全时隙存在干扰（后台查看上行存在干扰，外场测试可看到下行也存在干扰），一般干扰强度较大，</span><span lang=EN-US>ISCP</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">值为</span><span lang=EN-US>-85</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">以下，甚至有</span><span lang=EN-US>-70</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">以下的；如果是外部干扰，则该站点周围的其他</span><span lang=EN-US>TD</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">或</span><span lang=EN-US>GSM</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">也会存在干扰。修改</span><span lang=EN-US>UPPCH</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">偏置，干扰无缓解的现象。外部干扰的干扰源一般是小灵通系统，人为放置干扰器（比如加油站、政府部门、学校考试时段等特殊场所及部分场所举办特殊活动的时候会放置干扰器）。</span></font>

<span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\"><font size=\"3\">网内干扰：一般是上行时隙干扰，且只存在于某一频段或时段：</font></span>

<font size=\"3\"><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">（</span><span lang=EN-US>1</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">）频点扰码的干扰，一般忙时干扰较明显，各载频受干扰程度不一样，且</span><span lang=EN-US>ISCP</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">值不是很大，为</span><span lang=EN-US>-90</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">左右；</span><span lang=EN-US>2</span><span lang=EN-US>GPS</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">失步，</span><span lang=EN-US>GPS</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">失步还可能会对业务时隙造成交叉干扰</span><span lang=EN-US>,</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">较轻微失步时</span><span lang=EN-US>,</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">相邻小区无明显干扰</span><span lang=EN-US>,</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">但有可</span></font>

<font size=\"3\"><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">（</span><span lang=EN-US>2</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">）能会造成切换成功率降低；可尝试复位</span><span lang=EN-US>GPS</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">（登录</span><span lang=EN-US>NODE B</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">，命令：</span><span lang=EN-US>RST SYS</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">，即重启</span><span lang=EN-US>NODE B</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">）</span></font>

<font size=\"3\"><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">（</span><span lang=EN-US>3</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">）</span><span lang=EN-US>DwPTS</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">拖尾，会造成</span><span lang=EN-US>UPPCH</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">有持续干扰，而</span><span lang=EN-US>TS1 TS2</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">看起来正常</span><span lang=EN-US>.</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">要通过筛选找到拖尾的小区，调整工程参数像下倾角那些，但这样影响太大，最简单的就是改这个小区的频点和下行同步码，</span><span lang=EN-US>DwPTS</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">拖尾只对同频小区和一定下行同步码的小区造成影响</span></font>

<font size=\"3\"><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">（</span><span lang=EN-US>4</span><span style=\"font-family: 宋体; mso-ascii-font-family: \"Times New Roman\'; mso-hansi-font-family: \'Times New Roman\'\">）邻区关系不合理产生的干扰，如相邻小区信号很好，但是没有加为邻区，那么该小区的信号即为干扰信号；可通过完善邻区关系解决</span></font>

通信人家园 (https://www.txrjy.com/)

Powered by C114