When similar contention occurs again in future, the GSC performs the same random selection by ignoring the operator that was selected in the previous contention period.
As shown in this paper, by controlling the load of simultaneously transmitting nodes when contention occurs, the network throughput can be improved (Fig. 6) and queuing delay decreased (Fig. 7).
In (28), Ncoll,i and Ncont,i represent the total numbers of collisions and contentions occurred at MP i, respectively.
In Figure 3, we show a typical scenario where the intra-flow contention problem occurs.
In a worst-case scenario, such as the apartment setup in Figure 2, massive contention may occur.
In Figure 9, the drop in HP traffic throughput with an increase in the total number of traffic flows in the network is attributed to the more aggressive channel contention that occurs between the increasing number of HP flows in the system, thereby leading to higher collisions and hence lesser overall HP throughput. .
Because contention only occurs at the operator placed at the bottom level of the execution plan in form of a tree structure, it is sufficient to allocate a counter recording the occurrence frequency for each physical operator at the bottom level of the execution plan.
Although a lack of adherence to contention measures might have occurred in some cases, another factor possibly underlie this increase that mostly occurred outside the ICU.
This works supports the contention that naturally occurring OA in a large animal model can enable translational medicine.
However, flooding packets can lead to excessive drain on limited battery power and reduce the packet delivery ratio in WSNHA because MAC 802.15.4 cannot afford heavy routing overhead, which can easily cause a broadcast storm when contention and collision occur in the MAC layer.
