Information Technology Reference
In-Depth Information
Table 2.
The estimated error rates under unstable network environment
No.
n
value the estimated new
m
/
n
values
1 128 8/8 7/8 7/8 1/8 2/8 6/8 8/8 5/8 8/8
2 128 7/8 2/8 2/8 8/8 8/8 4/8 8/8 7/8 5/8
3 64 3/8 8/8 8/8 3/8 5/8 6/8 8/8 8/8 8/8
4 64 8/8 7/8 8/8 6/8 7/8 3/8 6/8 7/8 3/8
5 32 5/8 5/8 8/8 5/8 3/8 8/8 2/8 5/8 5/8
6 32 2/8 8/8 7/8 8/8 8/8 2/8 5/8 7/8 8/8
Table 3.
Several estimated results
No.
n
value the estimated new
m
/
n
values
1
128 7/8 2/8 2/8 8/8 8/8 4/8 8/8 7/8 5/8
2
128 4/8 6/8 2/8 7/8 8/8 2/8 6/8 4/8 3/8
3
64 3/8 8/8 8/8 3/8 5/8 6/8 8/8 8/8 8/8
4 64 8/8 7/8 8/8 6/8 7/8 3/8 6/8 7/8 3/8
5 32 5/8 5/8 8/8 5/8 3/8 8/8 2/8 5/8 5/8
6 32 2/8 8/8 7/8 8/8 8/8 2/8 5/8 7/8 8/8
The comparison of overhead between the fixed scheme and the adaptive scheme un-
der the same network environment is given in Fig.7.
average overhead(n=128, m/n=1/2)
average overhead(n and m/n are veriable)
350
300
250
200
150
100
-10
0
10
20
30
40
50
60
70
80
90
check point
Fig. 7.
The overhead comparison
We can see from it that most overhead of the check points in the adaptive scheme in
which the parameters vary with the network environment is much lower than the fixed
parameters scheme (
n
= 128 and
m
/
n
= 1/2). And the average overhead of the whole
check points is 164.205, which is less than 182 of the original scheme.
