Research Article
An Evolutionary Video Assignment Optimization Technique for VOD System in Heterogeneous Environment
Table 1
Summary of notations.
| | Symbol | Meaning |
| | Number of videos in the system | | Access bandwidth of the central video server (bits/s) | | Proxy size (in bits) | | Bandwidth for broadcasting (bits/s) | | System arrival rate (reqs/s) | | System service rate | | Popularity of video m | | Number of quality levels of video m | | Probability of customers requesting th quality of videos | | Arrival rate for the dedicated streams (reqs/s) | | Average rate of the dedicated streams (bits/s), replication and no broadcast | | Streaming rate of replicated video m having th quality level (bits/s) | | Size of replicated video m encoded into th quality (bits) | | Streaming rate of layered video m having th quality level (bits/s) | | Streaming rate of layer j of video m (bits/s) | | Size of layer j of video m (bits) | | jth quality of video m | | b | Proxy cache map matrix, | | e | Coding approach instance, | | w | Broadcasting map matrix, | | o | Cache-Broadcast map matrix, | | Crossover rate of GA | | Mutation rate of GA | | Population size of Gas | | th quality level |
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