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Figure 3 The primary and secondary interferences in link scheduling.
The FAS scheme considers both primary and secondary interferences in its collision-free scheduling.
The interference causing a packet collision is classified into two types: primary and secondary interferences.
Our proposed scheme prevents collisions caused by both primary and secondary interferences in duty-cycled WSNs. Figure 1 shows an example of the two types of interference that can occur in data aggregation scheduling, based on our assumption.
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There are two major kinds of interferences: primary interference and secondary interference.
In F G, the thick gray edge and the thin dark edge describe the primary interference and secondary interference, respectively.
Secondary interference occurs when a node that is receiving a data packet overhears another transmission intended for other nodes.
When a node transmits and receives at the same time slot, primary interference happens; when a node receive two or more distinct transmissions, secondary interference occurs.
Using sub-channelization of OFDMA, secondary interference between two links in the same slot is prevented by assigning different channels to the links.
When the strength of secondary interference to the primary is comparable to the desired signal, treating as noise is not an option because of interference constraints while decoding and canceling requires complex primary receivers.
If the reaction of the primary user (e.g., power control) upon receiving the secondary interference is exploited, some active spectrum sensing methods can be designed, which could significantly outperform the conventional passive sensing methods [88, 89].
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