Cryptography Reference
In-Depth Information
Figure 8.2. Cross-Layer Architecture—Integration, Coupling, and Horizontal
Calibration
physical layer so that it can adjust its error-correction mechanism. Subsequently,
the transport layer can inform the application layer about the TCP packet loss as
it would help the upper layer in the stack (application layer) to adjust its transmit-
ting rate. In addition, it should be noted that self-adaptation loops should not be
part of a cross-layer design approach, as they do not require new interfaces to be
created between the necessary lower and upper layers. For example, in an auto-
rate fall-back mechanism for rate selection in a wireless networking environment
with multirate physical layers, the Medium Authentication Code (MAC) layer
rate selection is dependent on the received acknowledgment that is observable at
the MAC layer. Hence, this mechanism would not qualify as a cross-layer design
approach as there is no need for creating new interfaces for rate adaption.
Figure 8.3. Horizontal Calibration
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