Table 2: Parameters of the experiment.

ParameterNominal value (range)

Number of videos (M)50
System arrival rate ( )0.3, 0.8 (  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 (Hx)10
Access bandwidth of the central video server (B)100 Mbps
Layering overhead (β)0.25
Proportion of bandwidth reserved ( )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 ( )