upport of 600 Mbps downlink peak rate. These rates are achieved when devices supporting more than three aggregated LTE downlink carriers become available. The LTE performance study done in an office environment was found to be roughly twice the comparable Wi-Fi network data rate, as shown in Figure 10.7, indicating only the extra performance achievable with a single 20 MHz carrier on unlicensed spectrum when there were no other interfering networks present and with 30 Mbps offered load per access node, as presented also in [2]. The office environment contained for both LTE and Wi-Fi networks six access nodes each operating on the same 20 MHz carrier without interference from other LTE Small Cell Optimization Downlink capacity with 20 MHz Downlink capacity with 20 MHz LTE only Wi-Fi only Figure 10.7 LTE capacity compared to the Wi-Fi capacity in the office environment networks. The relative capacity of LTE network would be even higher when the load and number of users are further increased as Wi-Fi capacity will not increase more or even goes down while LTE network can still reach higher throughout. Before the work started in 3GPP, the issue of use of unlicensed spectrum with LTE technology had also been addressed in relevant conferences in the field, such as presented in [3], raising different possibilities coexistence. Especially in the markets where regulatory requirements do not define specific methods to be used, one can of course consider solutions such as fixed amount of DTX to enable coexistence in addition to the more evolved solutions. If one would consider single access node with large number of traffic (hot spot), the LTE design allows the system to stay robust with very large number of users while capacity of Wi-Fi access would start to drop sharply with the increased number of traffic. The advanced features for handling the load in LTE can also be applied when operating in the unlicensed band thus facilitating high capacity also in the presence of large number of users. From the coverage point of vie