Notion::
The existing networks layer consists of OSI 7 layers. The rule is, each layer work independent.
The Cross layer, however, even break the rules of such a hierarchy, a independent property of OSI 7.
That is, the cross layer means that specific information send to a non-adjacent layer, or shared variables to share In
order to improve the efficiency in communication,
Why need::
It help the wireless communication that based on a existing OSI 7 layer, to improve about efficiency. Because the
wireless communication is not good in existing OSI 7 layer.
2 problems::
1) small scale channel variations
2) Large-scale channel variation
Therefore, we need a another architecture for wireless communication compared with OSI 7 layers.