Digital Signal Processing Reference
In-Depth Information
Fig. 7.4
The system scenarios along with their heuristic recommendations
•
decreasing the carrier sense threshold: this lowers the interference at the receiver
and, hence, increases the SINR at the receiver,
•
decreasing the transmission rate: this lowers the required SINR for successful
packet reception at the receiver.
Asymmetric Starvation
The asymmetric starvation problem occurs when terminal A is backing off for
terminal B. However, terminal B is not backing off for terminal A. Thus, terminal A
can try to remove this scenario by:
•
increasing the transmission power: terminal A wants to make himself heard by
increasing the received power at terminal B,
•
increasing the carrier sense threshold: terminal A wants to remove the asymmetric
starvation scenario by not listening to terminal B anymore.
Neighborhood Starvation
We have modeled neighborhood starvation in [46]. The only local action a termi-
nal can take to remove this scenario is to:
•
increase the carrier sense threshold.
Starvation-Free Scenario
Also for the most ideal scenario, we can give heuristic recommendations:
•
increase the transmission rate: the terminal tries to see whether a higher transmis-
sion rate can be sustained,
•
decrease the transmission power: the terminal tries to see whether the current
transmission rate can be sustained at a lower transmission power. This decreases
the interference towards other terminals, allowing them to increase their trans-
mission rate.
