Fig. 2
From: A dynamic handover scheme based on bidirectional VLC channel in multi-user attocell networks
Relevant diagram of system model: a A distribution mode of APs, b an AM model and c a geometry diagram of the AM model projected on the ground. Figure is illustrated in “System model” section. a shows a top view of four access points coverage and their geometric annotations. b depicts the access model in bidirectional visible light communications system, the light green and orange part illustrate the coverage of visible light signal from access point in downlink and from user’ terminal in uplink, respectively. c illustrates the geometric structure projected on the ground from b