Content deleted Content added
Adding some dead link tags. |
Made a few very minor text edits. No facts were added or removed. |
||
Line 14:
== Tailoring to resource efficiency of cross-layer==
The quality aspect is not the only approach to tailor the cross-layer optimization strategy. The control adjusted to availability of limited resources is the first mandatory step to achieve at least a minimum level of quality. Respective studies have been performed and will continue. <ref>http://www.nyman-workshop.org/2003/papers/Cross-Layer%20Optimization%20for%20Sensor%20Networks.pdf</ref>
== Adapting MAC scheduling based on PHY parameters ==
Line 21:
[http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6151784&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6151784 "Cross-Layer Optimization Using Advanced Physical Layer Techniques in Wireless Mesh Networks", in IEEE Transactions on Wireless Communications]</ref><ref name=Miao>{{cite book|author1=[[Guowang Miao]]|author2=Guocong Song|title=Energy and spectrum efficient wireless network design|publisher=[[Cambridge University Press]]|isbn=1107039886|year=2014}}</ref>
In some communications channels (for example, in power lines), noise and interference may be non-stationary and might vary synchronously with the 50 or 60 Hz [[AC current]] cycle. In scenarios like this, the overall system performance can be improved if the MAC can get information from the PHY regarding when and how the noise and interference level is changing, so that the MAC can schedule transmission during the periods of time in which noise and interference levels are lower.<ref name="Miao"/>
An example of a communications system that allows this kind of Cross-layer optimization is the [[ITU-T]] [[G.hn]] standard, which provides high-speed local area networking over existing home wiring (power lines, phone lines and coaxial cables).
| |||