Exact(3)
Under this scheme, a station is always aware of candidate helpers in the area.
They provide excellent performance even under imperfect (and realistic) conditions, such as a less invasive use of helpers, denial of help by some of the candidate helpers, and imperfect detection capabilities of Oppnet components.
The decision about whether the transmission is in Direct mode or in Cooperative mode is taken by the source station after considering the information maintained in the CoopTable about candidate helpers in neighborhood and the rates they can sustain with both the source and the destination.
Similar(56)
Earlier, HC and EC minislots are assigned for the candidate helper nodes with greater utility values.
The flow chart for the operation at a candidate helper node is shown in Fig. 5.
In a real environment, every station can be assumed as a candidate helper for any neighbor station.
Each entry in the CoopTable, which corresponds to one candidate helper, is indexed by its MAC address.
Fig. 4 Example of mapping between utility values and minislots Fig. 5 Flow chart depicting the process at a candidate helper node.
In HC and EC minislot contention, if any candidate helper node observes that another node has transmitted an RTH frame earlier than itself, it exits the competition.
Any candidate helper node whose two-hop effective rate (Re2) is greater than the one-hop effective rate (Re1) sends a short busy signal to notify all surrounding nodes that there is at least one eligible candidate helper node and thus, the helper node selection procedure will start.
These results suggest that the experimental evolution strategy can be used for LHS screening and Bc 21 is a candidate helper strain for 2-KLG production in high concentration of l-sorbose.
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