tailieunhanh - TEAM FLY WIRELESS NETWORK DEPLOYMENTS phần 4

Chúng tôi đã giải quyết các vấn đề này trong bài báo này cụ thể là, RF tuyên truyền, C / I, quy hoạch tần số, vị trí trang web di động, các vấn đề intermod . và các giải pháp có thể đề xuất để nâng cao năng lực và hiệu suất. Nếu độc giả của tôi tìm thấy thông tin hữu ích, tôi sẽ được thưởng amply. | 70 Chapter 4 approximately 500 sectors. reducing to approximately 380 for a conversion ratio of 1 when we deploy CDMA on every analog cell site within the aootprint. Ratio of CDMA to AMPS sites within CDMA footprint Figure 5. Shows the variation of the guard zone traffic with the conversion rate However as we increase the traffic the CDMA coverage starts to shrink. The coverage prodded by the cell sites along the border starts to shrink and we are required to deploy more cell sites within the dual-111 ode footprint to maintain the same coverage. As the coverage along the borders shrinks tlightly the number of cells within the guard zone is also reduced. This reduces the impact of the CDMA system on the underlying analog system while increasing the traffic a ity of the system. Table 1 illustrates the trend and shows the increase in the total traffic AMI S CDMA with respect to the the dual-mode footprint and the size of the guard f one. As we increase the number of cell sites within the dual-mode footprint we can increase the traafic that we can carry. As the CDMA traffic increases we could opt to add an additional frequency to our CDMA system. If we go to an additional frequency we clonblc pffectively the CDMA capacity though incurring an additional loss in the underlying analog system. From Table 1 we see that only when the fonversion rate is around or higher do we see that there Is a benefit togoing to another frequency. Optimization of Dual Mode CDMA AMPS Networks 71 Table 1. Increase in total Traffic AMPS5 CDMA with respect to the traffic in the dualmode footprint and the guard Conversion Rate CDMA Traffic Sectors in Guard zone Reduction in Analog Traffic E Total Traffic E 785 500 827 42 073 861 452 748 114 949 424 701 248 092 1014 389 643 371 1 00 1084 378 625 459 Before the actual deployment uniform traffic amongst the cells is typically assumed. However in a rail deployment .