Abstract
This paper describes the measurements of the signal level changes in LTE networks in different indoor conditions and compares them with OMNeT++ simulation scenarios. The simulation models are matched with the measurements to have the same average signal level for stationary client. Next the mobility model is applied in the simulation and compared with the measurements of the user moving within a building. The comparison has been executed for signal level changes for mobile phones and tablets in three indoor usage scenarios: stationary, office and home mobility. The results show that the popular mobility and signal propagation models give a significantly different variance of the changes of signal level compared with the measurements and are not correctly representing the variance caused by indoor fading.
Highlights
Communication by mobile networks became part of our living
The simulation models rely on two elements to proper represent the transmission conditions and attenuation of the radio link in mobile networks: the radio signal propagation model and the user mobility model
(a) Gauss-Markov 40 dBm (b) RandomWaypoint 40 dBm measured and simulated values in home environment (a) Gauss-Markov 40 dBm (b) RandomWaypoint 40 dBm measured and simulated values in office environment (a) Gauss-Markov 40 dBm (b) RandomWaypoint 40 dBm measured and simulated values of a moving office worker (a) Gauss-Markov (b) RandomWaypoint measured and simulated values in home environment tinguishing maximums, one around values -79 dBm to -74 dBm and the second one -94 dBm to -82 dBm. This is most (a) Gauss-Markov (b) RandomWaypoint measured and simulated values in office environment (a) Gauss-Markov (b) RandomWaypoint measured and simulated values of a moving office worker probably caused by the wall partially separating the room where measurement took place. We simulated this case in the model and we obtained similar effect of signal level concentrating in two different levels, the results of the simulation are considerably different than the measurements
Summary
Communication by mobile networks became part of our living. Among various technologies used for providing indoor and outdoor coverage the LTE (Long Term Evolution) is gaining most attention and is becoming a natural upgrade for the GSM and UMTS networks. The LTE provides data transmission peek rates of 300 MBit/s. Both indoor and outdoor and it has been widely deployed around the world. The wireless networks for mobile devices consist of multiple base stations and provide coverage over a large area. As the mobile clients move, the communication between them and the network is handled by different eNodeBs (base stations). The received signal level changes in time due to node mobility and due to changes in the environment and fading This is the case especially for indoor usage of LTE devices, when even a slight change in the device location may result in large change of measured received signal level and the radio channel fading is significant
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