Project from one of our clients
Project Background Due to the propagation characteristic of the WCDMA signal, it needs to endure a high amount of path-loss during signal transmission. Hence, poor signal coverage among the indoor areas are very common. The SPA, GYM and Parking lot of a resort that located in the Central Region of Indonesia are having the weak WCDMA signal problem, while tourists tend to use their WCDMA smart phones around these locations. Therefore, the WCDMA signal enhancement at these locations is urgent. A High Output Power WCDMA Repeater is being implemented in the resort and its primary targeted coverage areas are the SPA, GYM, and Parking lot, and with this High Output Power WCDMA Repeater, the weak WCDMA signal becomes strong and stable. The figure below indicates the site figure and location of this resort. Figure 1 Site Survey The required coverage site information is listed in the Survey Table below. Table 1 From the site survey form, it is obvious that the received donor signal was very good. Table 2 Installation Layout According to the repeater system, the link budget of this repeater site was pre-calculated in order to estimate the approximate repeater performance after the repeater implementation. A detailed Repeater installation location and the actual repeater installation are shown in the figure below. Figure 3 The repeater, donor, and service antennas installation locations are shown in the floor plan figure below. Figure 4 For this repeater site, a Log periodic Antenna was being used as the donor antenna, and there were a total of ten Omni antennas and two Panel antennas being used as service antennas. Figure 5 Test Results Walk tests were done in the repeater coverage areas in order to measure the repeater performance after the repeater was ON. The walk tests primary focused on the following: Scrambling Code Test, RSCP Test, Ec/No Test, CSSR RSCP Test, and CSSR Ec/No Test. All these test results are illustrated in the next few figures. The test result of the Scrambling Code is displayed in the next figure. It shows that in the repeater coverage area the signal is pure, and only one scrambling code was measured. Walk Test – Scrambling Code Plot Figure 6 The RSCP plot demonstrates the signal strength improvement in the SPA, GYM, and Parking lot areas, in most repeater signal coverage areas, the RSCP of the signal is greater than -83dBm. Walk Test – RSCP Plot Figure 7 The CSSR RSCP plot showed that there were no drop calls during the RSCP walk test in the repeater coverage area. Walk Test – CSSR RSCP Plot Figure 8 The Ec/No plot indicates the quality in the SPA, GYM, and Parking lot areas were greatly improved, the quality was better than -5dB among all the coverage areas. Walk Test – Ec/No Plot Figure 9 From the CSSR Ec/No plots, it can be clearly see that there were no call drops during the walk test. Walk Test – CSSR Ec/No Plot Figure 10 Conclusion It is known that the repeater is an ideal solution to extend the cell coverage, because the repeater can be implemented onto a site within a short time, and signal improvement for the site is done swiftly. In this case study, after the PRD40-WCDMA was implemented and ON Air, the 3G signal coverage in the resort improved notably.