The Effectual Spectrum Defragmentation Algorithm with Holding Time Sensitivity in Elastic Optical Network (EON)

Table 1

Symbols used in predefinitions.

Symbol	Description
B	Bandwidth
D	Client demand
El and Ep	The spectrum continuity
FSs	Frequency slots
Gb	Guard band
Ht	Holding time
L	The number of links is present between all nodes.
M	Modulation format
N	Network
P	Candidate path
Pr and Nr	Current route and next route
R	All routes between the source and the destination
Rc	Connection to be reconfigured
Rt	Routing table
S	Space
s and d	Source and destination
Sslot	The spectrum granularity in EON
T	Time
	The size of the present huge block
	Optical channel and the minimum number fragmentation index