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To describe the Connectivity Prediction Method, we create a performance evaluation model. In this model, parameters are as follows:
Number of peer groups: m
Total number of peers: n
Arrival rate: ル
Departure rate: レ
Utilization Rate: ヱ=ル/µ
In the figure, peer B is participating in peer group II with arrival rate ル and also departing peer group II with departure rate レ. It is difficult to investigate ル and レ, e.g. peers¨ participation and departure from P2P internet file sharing service caused by a hardware failure of peers, and staffs' move in/out of their working sections in the society. |