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郑州联通案例分享:5G 模三干扰导致用户速率慢的处理

  • 2026-04-22 09:57:07
郑州联通案例分享:5G 模三干扰导致用户速率慢的处理

5G 模三干扰导致用户速率慢的处理

郑州联通登封分公司 王松明 孙会源

一、问题背景

客户经理,在走访园区时,有客户反馈:所在位置上网速率异常缓慢,刷视频一直转圈,严重影响正常使用,需排查定位并解决问题。

二、现场测试与问题定位

1. 测试环境与工具

使用专业 5G 测试软件在用户投诉点位进行测试,重点采集所占用小区参数、信号质量与速率数据,测试界面核心参数如下:

2. 关键指标分析

  • 服务小区状态:当前服务小区为 PCI=186,RSRP=-75.5dBm(信号强度良好),但 SINR 仅 - 12.53dB,RSRQ=-12.65dB,两项核心质量指标严重不达标,是速率慢的直接原因。

  • 邻区干扰排查:同频(NARFCN=422910)邻区中,PCI=198 的小区 RSRP=-77.53dBm,与服务小区信号强度差值仅 2dB,属于强邻区干扰。

  • 模三干扰判定:计算 PCI 模三值:

    PCI=186:186 ÷ 3 = 62,余数为 0,模三值 = 0

    PCI=198:198 ÷ 3 = 66,余数为 0,模三值 = 0两个小区同频、同模三值,且信号强度接近,满足5G 模三干扰的核心特征:同频同模三、强信号重叠覆盖,导致 SSB 同步信号、导频信号相互干扰,SINR 急剧恶化,最终造成速率大幅下降。

  • 现场环境验证:用户所在位置楼顶即为 PCI=198 的基站,该小区为用户主覆盖小区;而 PCI=186 的基站位于用户点位正北约 900 米处,因方位角、下倾角设置不合理,中间无遮挡,信号越区覆盖至用户所在区域,与主覆盖小区形成强同模三干扰。

三、问题根因分析

1.核心根因:PCI=186 与 PCI=198 两个 5G 小区同频、同模三值,且 PCI=186 基站越区覆盖,在用户点位形成强重叠覆盖,引发严重模三干扰,导致 SINR 恶化、速率骤降。

2.次要诱因:PCI=186 基站方位角、下倾角设置不合理,信号过度覆盖至非目标区域,放大了干扰影响。

四、优化方案与实施

1. 优化思路

优先通过天馈调整解决越区覆盖问题,消除同模三强干扰,而非直接修改 PCI(避免引发新的邻区干扰):

  • 保留用户主覆盖小区 PCI=198,确保用户正常接入;

  • 对 900 米外的 PCI=186 基站进行天馈优化,收缩其覆盖范围,避免信号越区至用户区域,从根源上消除同模三干扰。

2.具体实施操作

根据现场覆盖情况,在网络摸排后,确定优化方案

上塔对 PCI=186 基站进行天馈调整:

方位角调整:将原方位角由180°方向调整至150°,收缩信号覆盖范围,避免信号直射用户区域;

下倾角调整:机械下倾角向下压3°,压低天线覆盖高度,减少信号越区覆盖,确保 PCI=186 仅覆盖其目标服务区域。

五、优化效果验证

1. 指标复测

调整后在用户点位复测,核心指标显著改善:服务小区切换为 PCI=198(主覆盖小区),RSRP 稳定在 - 75dBm 左右(信号强度保持优质);SINR 提升至 15dB 以上,RSRQ 优化至 - 8dB 以内,彻底消除模三干扰;下载速率提升至 200Mbps 以上。

2. 用户回访

回访投诉用户,确认上网速率恢复正常,刷视频、下载文件等场景无卡顿,问题彻底解决。

六、经验总结与预防措施

(一)5G 模三干扰是影响速率的常见问题,核心特征为同频、同模三 PCI、强信号重叠覆盖,排查时需重点关注 SINR 与 RSRP 的匹配度:若 RSRP 良好但 SINR 极差,优先排查同模三强邻区干扰。

(二) 预防措施

1.新建基站规划 PCI 时,严格遵循同频小区模三值错开原则,避免相邻 / 重叠覆盖小区出现同模三情况;

2.定期开展天馈优化,核查越区覆盖小区,根据网络测试情况,结合用户需求,及时调整方位角、下倾角,减少重叠覆盖带来的干扰;

3.针对用户投诉速率慢的场景,优先排查 SINR 指标,快速定位模三干扰、重叠覆盖等问题,提升故障处理效率。

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  1. CONNECT:[ UseTime:0.001005s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000404s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000698s ]
  6. SELECT * FROM `set` [ RunTime:0.000346s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000662s ]
  8. SELECT * FROM `article` WHERE `id` = 518280 LIMIT 1 [ RunTime:0.000446s ]
  9. UPDATE `article` SET `lasttime` = 1777047529 WHERE `id` = 518280 [ RunTime:0.001137s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000262s ]
  11. SELECT * FROM `article` WHERE `id` < 518280 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000515s ]
  12. SELECT * FROM `article` WHERE `id` > 518280 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000458s ]
  13. SELECT * FROM `article` WHERE `id` < 518280 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000648s ]
  14. SELECT * FROM `article` WHERE `id` < 518280 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001296s ]
  15. SELECT * FROM `article` WHERE `id` < 518280 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001003s ]
0.143531s