The mobile to fixed measurement is important as in most scenarios the clients will be mobile. In this case, as the antenna gains and the transmit power of the mobile device and the fixed differs significantly from each other, the uplink channel will have different properties from those of the downlink (from AP to mobile) channel. The measurement of radio channel properties on the client side will not give us a proper picture. Therefore we have measured the data transmission capability to both destinations. During the measurements the access point with a 10 dBi antenna fixed on a 4 m high mast has been situated outside the building. As a first situation, the mobile device had been put inside the building (Figure 3, 4). The data rates measured are shown in MBit/s in the Figure 3, 4. Despite of the 40 cm thick walls we have been able to achieve acceptable data rates. Figure 4 shows the second measurement when between the access point and the mobile device there was a concrete building. Even in this case we have measured data rates of 1 MBit/s. In the third measurement we have measured the data transfer capability in a park with bushes and trees (Figure 6). In most cases we have experienced an acceptable data rate. In some situations the data rate measured has been changing drastically within only one meter of distance.
Figure 3
Figure 4
Figure 5
Figure 6
From these measurements we can conclude that there is a high probability that the user with a mobile device will be able to use the wireless services in a WMN even in the case of NLOS. The measurements have been conducted in the town centre. In the suburbs of the town or in rural areas this probability will be much higher.