| Abstract [eng] |
TD-LTE Network's Computer Simulation and Experimental Evaluation The LTE radio access is based on Orthogonal Frequency-Division Multiple Access (OFDMA) technology and supports different carrier frequency bandwidths (1,4–20 MHz) in both frequency-division duplex (FD) and time-division duplex (TD) modes. In nowadays there is rapidly developing and very popular high-bandwidth wireless transmission systems, such as LTE. So, my experiment aim are to make wireless TD-LTE network planning with “ICS Telecom“: theoretically calculating signal distribution and throughput maps, assessing the geographical location of the base stations installations and various interference influences in communications. Also, make some computer simulations of this network scenario with GNU Octave software package, compared with FD-LTE technology. Finally to carry out experimental TD-LTE network evaluation, compared with the theoretical modeling results. The investigations were carried out in the public company "Lithuanian Radio and Television Centre” (LRTC), and Vilnius University Telecommunications Science Center. After acquiring bases of “ICS Telecom” program package, were planned New Vilnia signal distribution, signal and noise ratio and throughput maps. It has been observed that the region was covered with ~ 80 percent of very strong signal, the rest of the area was weaker due to woodland or higher buildings affect. These results were compared with experimental, there was found that areas with high SINR and RSRQ obtained a very stable, high-quality and maximum throughput, which corresponds to the theoretical coverage values, also noted that it is possible both: comparatively lower throughput due to flow restriction of a base station; and data stream cracking due to low upload speeds. Finally, a comparison of FD-LTE and TD-LTE technology modeling with “GNU Octave" software package, was discovered that the FD-LTE technology has a high transfer speed (~70-60 Mbps) near the base station area, while the TD-LTE technology speed is variable (~ 55 to 30 Mbps), depending on the download and upload ratio. |
