An Evolutionary Video Assignment Optimization Technique for VOD System in Heterogeneous Environment

Table 2

Parameters of the experiment.

Parameter	Nominal value (range)
Number of videos (M)	50
System arrival rate (𝜆)	0.3, 0.8 (0.1-1 reqs/s)
Proxy size (K)	5% (5% of the total video storage requirement in the replication system is about 5 Gbits.) (0%, 5%, 10%)
Number of broadcast channels (H^x)	10
Access bandwidth of the central video server (B)	100 Mbps
Layering overhead (β)	0.25
Proportion of bandwidth reserved (𝑝𝑟𝑠𝑣)	0.1 (0, 0.1, 0.5)
Crossover rate of GA (σ)	0.6
Mutation rate of GA (δ)	0.01
Population size of GA (Z)	20
Skew parameter (θ)	0.271 (0, 0.217, 1)
Layer stream rate (𝜂^𝐿𝑚𝑗)	𝜂^𝐿𝑚1