Planning Optimization of the Distributed Antenna System in High-Speed Railway Communication Network Based on Improved Cuckoo Search

Table 2

Introductions of the parameters used in Section 3.

Symbol	Meaning
	Total cost of the DAS
	Cost of the passive optical splitters
	Cost of the optical line terminal
	Cost of the antenna units
	Cost of the optical fiber
	Unit price of the passive optical splitter
	Unit price of the optical line terminal
	Unit price of the antenna unit
	Unit price of the optical fiber
	Distance between the passive optical splitter and antenna unit
	Distance between the passive optical splitter and the optical line terminal
	Instantaneous rate of the network in
	Minimum network transmission rate limit
	Instantaneous velocity of the train at
	End abscissa of the ith logical cell
	Start abscissa of the ith logical cell
	Time of crossing the two logical cells
	Theoretical hand-off time
	Switching regulator