Information Technology Reference
In-Depth Information
BS
2
1
Layer 1
3
9
subnet1
5
4
8
subnet3
subnet2
11
10
6
7
17
24
18
12
13
16
23
Layer 2
19
20
14
15
22
25
32
21
33
26
34
31
28
35
Layer 3
27
30
36
29
subnet4
subnet5
Fig. 3.
Result of networking
Although the LVPLC environment is unpredictable, according to the actual
point-to-point tests, the overall trend of power line signal transmission quality
has a certain relationship with the communication distance due to the signal
attenuation. It is assumed that effective communication is generated at random
in a certain range, so that a dynamic communication distance could be set to
imitate the changing signal transmission environment. In the simulation, the ef-
fective communication distance is generated randomly at 25-30m. The proposed
ACRA of LVPLC is shown in Figure 6.
Fra_H
0
8
0
0
5
Data Fra_E
Fra_H
0
16
0
1
5
13
Data Fra_E
Fra_H
0
31
1
0
5
13
28
Data Fra_E
Fig. 4.
Example of data frame format
According to Figure 5 and Figure 6, each node in tree topology only has single
point-to-point link. Whenever one communication link broke down, unless the
whole network re-constructed again, the interrupted communication link won't
be restored. In the ACRA network, the nodes in the same layer can communi-
cate with other nodes. A meter unit may re-communicate with others due to
the additional tangential connections when one communication link interrupted.
After networking, the BS communicates with any node in the networking via
the center node which it belongs to as relay node, example is shown in Table.1.
It is obvious that communication quality of ACRA is more effective than that in
Search WWH ::
Custom Search