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= Architecture

Figure 1 presents a system view of the COSMOS testbed. It is based on a multi-layered computing system built in a bottom-up manner with commodity components, programmable hardware, and open-source software.

[[Image(COSMOS-Architecture.png, width=800)]]
[br] '''Figure 1: COSMOS Architecture'''


Each of the domains consists of three types of hardware components:
 * SDR nodes (user devices and radio hardware), 
 * edge cloud servers (radio cloud)
 * general purpose computing cloud. 

In particular, COSMOS includes three types of radio nodes:
 * large (rooftop installed "multi-sector base station" (BS))
 * medium (building side or lightpole-mounted "microcellular BSs")
 * small (fixed or mobile).