In underlay spectrum access,we know that the average transmitting power of the primary user is known by the secondary user as SU can transmit data within a threshold level.but what other primary users specification or parameter or knowledge should the secondary user have to access the spectrum efficiently.
the capability cannot simply be realized by monitoring the power in some frequency band of interest but more sophisticated techniques are required in order to capture the temporal and spatial variations in the radio environment and avoid interference to other users.
except power, Bit error rate, SNR and the probability of when PU will access band again
if it's model based then it highly depends on the model you use for the PU. the available information you need to know to avoid interference is the maximum allowed transmission power for SU, the expected transmission power for the PU and the access slot/frequency or probability.
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