, , , . .. , , , .. . .
, , . , , , , , , . , , , . .
7.2.
M/D/n/m>. , . , - (t), , , . , , t >t t , , , .. , t . , .. ( ). (t), , - , , , , . , .
, (t ) , n , -n . , . , , , . . (t ) > n, t + , (t ) n , .. , , . (t ) < n,
t + n - (t ) , . , (t) t , t + , (t ). , (t), , ( ), , (t). , . , , . .. , , (t) : P (x)= () e /x!
|
|
(t) , t n . , , , . t+ , , , . . .
(t) =
P C(t) P(0)
P (t + = C(t) P(1) + P (t) P(0)
P (t+ =C(t) P(2) + P (t) P(1) + P (t) P(0)
..
P (t + )= C(t) P(k) + P (t) P(k - 1) + + P (t) P(1) + P (t) P(0) ( 7.1 )
() .
, , :
P = C* P P(k - 1) + + P P + P P(0) ( 7.2 )