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Each CR transmitter estimates its possible maximum interference range not only based on the primary sensing information gathered directly from itself, but also with the help of one hop secondary neighbors (SNs).
For a node v, it should guarantee that nodes with higher priority within its H hop distance have been assigned channels before it; as for nodes outside H hops, they are impossible to generate interference for node v. Here, (H = left lceil {frac {{R^{prime }}} {T}} right rceil ), R ′ is the maximum interference range with channel separation 0, i.e., co-channel interference range.
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Table 2 Simulation parameters Field size 1000 m × 1000 m Maximum transmission range 250 m Interference range 550 m Number of nodes 50 100 MAC protocol 802.11 Traffic pattern CBR Trans.
while in the disk graph model, the threshold D is replaced by the maximum between the interference ranges D x and D y of the two readers.
Let R T and R I stand for the maximum transmission range of SU and the interference range of PU, respectively.
As the distance grows, the attenuation of the signal prevents the reader from disturbing the activity of the other readers: the maximum distance D beyond which no interference is generated is called interference range or collision range.
Specifically, interference is assumed when nodes have overlapping interference range.
We take into account three optimization objectives, including the maximum interference, average interference and average path interference.
Figure 3 Effect of large Interference range.
Before introducing the interference model, we present the concept of transmission range and interference range.
It remains to mitigate the maximum interference at two hops.
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