The impact of ONU placement on the network throughput gain.
We conduct an experiment to see the impact of ONU placement on network throughput gain in Fig. 8.
In the simulation, the maximal node degree of the network is 3.
There are 10 gateways (ONUs) deployed in the network with each gateway randomly selecting 3 wireless routers from a set of routers S for direct wireless communications. We vary the size of S from 10 to 50. With smaller size of S, the probability that each gateway selects 3 different wireless mesh routers is lower.
In other words, gateways are deployed in a relatively concentrated area.
Therefore, the average number of hops from a wireless client to a nearby gateway may be large, which causes more interferences in the wireless network, thus limiting the network throughput.
However, with larger size of S, more wireless routers have the chance to directly connect with gateways. In other words, gateways are scattered in the network so that the average number of hops from a wireless client to a nearby gateway may decrease, which will benefit more from the wireless-optical-wireless communication mode introduced by the FiWi network, thus improving the network throughput significantly.
However, the network throughput is not so sensitive to the placement of gateways in the traditional WMN as shown in Fig. 8.
The impact of ONU placement on the network throughput gain. We conduct an experiment to see the impact of ONU placement on network throughput gain in Fig. 8. In the simulation, the maximal node degree of the network is 3. There are 10 gateways (ONUs) deployed in the network with each gateway randomly selecting 3 wireless routers from a set of routers S for direct wireless communications. We vary the size of S from 10 to 50. With smaller size of S, the probability that each gateway selects 3 different wireless mesh routers is lower. In other words, gateways are deployed in a relatively concentrated area. Therefore, the average number of hops from a wireless client to a nearby gateway may be large, which causes more interferences in the wireless network, thus limiting the network throughput. However, with larger size of S, more wireless routers have the chance to directly connect with gateways. In other words, gateways are scattered in the network so that the average number of hops from a wireless client to a nearby gateway may decrease, which will benefit more from the wireless-optical-wireless communication mode introduced by the FiWi network, thus improving the network throughput significantly. However, the network throughput is not so sensitive to the placement of gateways in the traditional WMN as shown in Fig. 8.
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