to-understand example only one is selected. Location - In this example the indoor network requires space in a server room and loca- tions around the office to install DUs with the connection between these locations provided by a dedicated Ethernet connection. The option of space in a server room, and the desire to keep the DUs small help influence the architectural options for this network. Disaggregation - With a central location available many of the small cell functions can be centralized. This has the advantage of enabling centralized SON and scheduling functions and potentially CoMP where transmissions are received from several DUs and joined in the upper PHY. The split between the CU and DU will follow the ORAN FH. Platform - With much of the small cell centralized this scenario is ideal for a pool of virtualized small cells running on off-the-shelf server hardware. The RRU will be a low-cost SoC design. 4 NG-RAN Architecture Office Server room (1) Location HIIIIIIIII (2) Disaggregation ORAN FH Virtualized Software (3) Platform Ethernet Hardware Figure 4.6.9 Indoor enterprise scenario. Frequency - The small cell is operating in the sub-6 GHz range on licensed frequencies. Operational mode - Although the small cell network was implemented to benefit employ- ees it is still likely to be a public network, meaning that visitors will also be able to attach and gain a service. If the corporate company already has a business relationship with one mobile operator, then this may be a small cell network serving just one operator. Alternatively, it might be neutral host to serve both the work and private smartphones of all employees regardless of their network. 4.6.6.2 Outdoor Urban Example The second example of a small cell deployment scenario is outdoor urban and is included since this is also a key market for small cells. Specifically, it is viewed as the biggest growth area for small cells (SCF 050) due to the expected 5G trend for ultra-dense networks. An example of this scenario is shown in Figure 4.6.10 and is 