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郑州联通案例分享:破局“满格信号下的无声之困”

  • 2026-03-31 07:40:30
郑州联通案例分享:破局“满格信号下的无声之困”

破局“满格信号下的无声之困”

网络优化中心 孙贝贝

郑州锦绣山河玉晖园小区及周边区域陆续接到用户集中反馈,反映在终端显示信号强度满格的情况下,通话过程中频繁出现断续、杂音、单通等现象,严重影响居民及周边用户的正常通信体验。经初步核查,周边基站网管数据显示覆盖指标均处于正常范围内,未发现明显的网络异常。然而,用户实际感知与网络指标之间存在显著差异,初步判断可能存在隐蔽的外部干扰源,导致上行链路受扰,进而影响通话质量。为精准定位问题根源,亟需开展现场排查与干扰分析。

【排查与分析】

为根治此“疑难杂症”,进行实地勘察与精细测试:

现场复现与初步定位:技术人员在现场测试中发现,虽然无线覆盖良好,但在上行频段检测到稳定的强干扰,干扰值达到-89dBm左右,这远高于正常底噪水平,是导致通话质量下降的直接原因。

干扰源精确定位:通过沿路逐步排查,团队在小区西北角供电所附近捕捉到异常强烈的信号波动。在此区域,干扰强度急剧攀升至-75dBm,显著异常,由此锁定干扰源极有可能位于此处。

干扰源位置                               放大器照片

干扰源确认:在协调相关单位后,技术人员对疑似干扰设备的天线馈线进行了断电测试。断开瞬间,扫频仪显示原本高耸的干扰波峰迅速回落到正常水平,同时网管后台监控的干扰指标也立即恢复正常。

扫频仪波形图

【解决方案】

确认干扰源后,考虑到彻底移除干扰源可能涉及外部协调等复杂因素,为快速解决用户问题,制定了加装高性能滤波器的优化方案。

滤波器

技术原理:滤波器具备频率选择性通过或阻断的特性。在本案例中,滤波器被配置为仅允许L900频段(904MHz-915MHz)的有用信号通过,而对带外的强干扰信号进行有效抑制。

实施细节:在受影响的小区基站射频单元前级安装工作频段为904MHz-915MHz的滤波器,其关键指标要求对干扰信号实现≥40dB的衰减。

【实施效果】

滤波器加装完成后,网络指标和用户感知均得到立竿见影的改善:

  • 干扰指标显著下降:网管数据显示,4G小区的上行干扰电平由整治前的-89dBm大幅降至-102dBm,已回落至正常水平。这标志着外部强干扰对系统的影响被成功“隔离”。

  • 通话质量彻底改善:现场技术人员进行拨打电话验证,话音清晰、纯净,无任何杂音或断续。

  • 用户满意度大幅提升:通过对前期投诉用户进行回访,所有用户均反馈通话质量已恢复正常,使用感知得到明显提升,问题得到圆满解决。

干扰指标对比

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  1. CONNECT:[ UseTime:0.000481s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000816s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000286s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000462s ]
  6. SELECT * FROM `set` [ RunTime:0.000185s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000525s ]
  8. SELECT * FROM `article` WHERE `id` = 496407 LIMIT 1 [ RunTime:0.000403s ]
  9. UPDATE `article` SET `lasttime` = 1776019471 WHERE `id` = 496407 [ RunTime:0.000768s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000228s ]
  11. SELECT * FROM `article` WHERE `id` < 496407 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000440s ]
  12. SELECT * FROM `article` WHERE `id` > 496407 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000380s ]
  13. SELECT * FROM `article` WHERE `id` < 496407 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000997s ]
  14. SELECT * FROM `article` WHERE `id` < 496407 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000708s ]
  15. SELECT * FROM `article` WHERE `id` < 496407 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000982s ]
0.075911s