課程說明......................................................................................................................................1
課程介紹......................................................................................................................................1
課程目標......................................................................................................................................1
相關資料......................................................................................................................................1
第 1章概述..................................................................................................................................2
1.1 干擾對網(wǎng)絡的影響..................................................................................................................2
第 2章干擾源...............................................................................................................................3
2.1 干擾源分類.............................................................................................................................3
2.1.1 自然噪聲......................................................................................................................3
2.1.2 人為噪聲......................................................................................................................3
2.2 對移動通信有主要影響的干擾源............................................................................................4
第 3章干擾問題的發(fā)現(xiàn)................................................................................................................6
3.1 通過OMC話統(tǒng)發(fā)現(xiàn)干擾........................................................................................................6
3.2 OMC告警和用戶申告............................................................................................................8
3.3 通過路測發(fā)現(xiàn)干擾..................................................................................................................9
第 4章定位和排除干擾源...........................................................................................................10
4.1 干擾定位和排查建議步驟.....................................................................................................10
4.1.1 根據(jù)關鍵性能指標KPI 確定干擾小區(qū)...................................................................10
4.1.2 檢查OMC告警..........................................................................................................10
4.1.3 檢查頻率規(guī)劃.............................................................................................................10
4.1.4 檢查小區(qū)參數(shù)設置.....................................................................................................11
4.1.5 路測...........................................................................................................................11
4.1.6 干擾排除....................................................................................................................11
4.2 硬件故障定位和排除............................................................................................................11
4.2.1 天線性能下降.............................................................................................................12
4.2.2 天線或饋管進水.........................................................................................................13
4.2.3 天饋接頭故障.............................................................................................................13
4.2.4 天線接反....................................................................................................................14
4.2.5 基站跳線接錯.............................................................................................................15
4.2.6 TRX故障...................................................................................................................16
4.2.7 時鐘失鎖....................................................................................................................19
4.2.8 小結(jié)...........................................................................................................................20
4.3 網(wǎng)內(nèi)干擾...............................................................................................................................20
4.3.1 同頻干擾....................................................................................................................20
4.3.2 鄰頻干擾....................................................................................................................23
4.3.3 越區(qū)覆蓋導致干擾.....................................................................................................24
4.3.4 緊密復用引起干擾.....................................................................................................25
4.4 直放站干擾...........................................................................................................................26
4.5 網(wǎng)外干擾...............................................................................................................................27
4.5.1 微波干擾....................................................................................................................27
4.5.2 大功率電臺干擾.........................................................................................................28
4.5.3 地面衛(wèi)星站干擾.........................................................................................................29
4.6 數(shù)據(jù)配置或設定錯誤導致干擾..............................................................................................30
4.7 其它導致干擾的現(xiàn)象............................................................................................................32
4.8 虛假干擾...............................................................................................................................34
第 5章抗干擾措施......................................................................................................................36
第 6章干擾測試工具..................................................................................................................37
6.1 頻譜儀的基本知識介紹.........................................................................................................37
6.2 定向天線...............................................................................................................................38
第 7章干擾的測試方法..............................................................................................................39
7.1 內(nèi)部干擾的測試方法............................................................................................................39
7.2 外部干擾的測試方法............................................................................................................39
7.3 外部干擾源的搜索方法.........................................................................................................40