中级培训第二模块之一：频率规划.ppt

Adjacency Planning 同站的其它扇区必须做成邻区。 第一圈须做邻区，第二圈根据情况考虑。 通常相邻小区是要做成双向的，A做B，那么B也要做A。 相邻小区最多做32个，如果要加入新的邻区，那么就要先删除一个。 相邻小区不要做的太多，这样手机就有更充足的时间来扫描邻区，使得测试报告的结果更准确，从而使切换更准确。 规划原则 Mapinfo Planning Tool (MIPT) can be used to check neighbor cells on map. There’s a button “Click Find Neighbor” on the toolbar. RED is the serving cell that you want to find its neighbor. Yellow is the neighbors of the serving cell. Gray is not the neighbors of the serving cell. Neighbors can be added/deleted from the database using MIPT - Edit database. Demonstration in Mapinfo. Adjacency Planning 频率分配 确定可用的频点 查找干扰源： CDMA 外部干扰 微波 直放站等 不同层使用不同的频率复用 注意各层间的保护 Three type of BCCH planning are available Dedicated Band Common Band Dedicated mixed Band BCCH TCH BCCH + TCH BCCH TCH Dedicated band Common band Dedicated mixed band Multiple Reuse Pattern (MRP) 1 3 6 9 12 15 18 21 safe planning (BCCH layer) normal planning (TCH macro layer) tight re-use planning (IUO layer) same frequency in every cell (“spread spectrum”) 每层所使用的频点数不同。 BCCH层使用最大的复用方式，即频点最多。 第二层分配给第二块载频，频点相对BCCH层要少。 随着TRX数量的增加，每组的复用度降低，频点也变少。 BCCH Reuse 15 12 12 9 TRX1 TRX2 TRX3 Multiple Reuse Pattern (MRP) Multiple Reuse Pattern (MRP) Example of capacity increase with MRP Network with 300 cells Bandwidth : 8MHz (40 radio channels) Single reuse of 12 Network capacity = 40/12*300 = 1000 TRX Multiple reuse BCCH layer : reuse of 14, 14 frequencies allocated Normal TCH : reuse of 10, 20 frequencies allocated Tight TCH : reuse of 6, 6 frequencies allocated Network capacity = [(14/14) + (20/10) + (6/6)]*300 = 1200TRX Multiple Reuse Pattern (MRP) 跳频 MAIO - 0 1 2 - 3 4 5 - 6 7 8 BTS-3 BTS-2 BTS-1 (sector 3) (sector 2) (sector 1) f1 f2 f3 f4 f5 f6 f7 f8 f9 f10 f11 f12 MAIO offset 0 3 6 HSN 3 3 3 RADIO RESOURCE MANAGEMENTRF Hopping (Site based MAIO allocation) TRX-1 BCCH TRX-2 TCH TRX-3 TCH TRX-4 TCH TRX-5 BCCH TRX-6 TCH TRX-7 TCH TRX-8 TCH TRX-9 BCCH TRX-10 TCH TRX-11 TCH TRX-12 TCH RADIO RESO