Spectrum pooling is a spectrum management

Spectrum management

Spectrum management is the process of regulating the use of radio frequencies to promote efficient use and gain a net social benefit.The term radio spectrum typically refers to the full frequency range from 3 kHz to 300 GHz that may be used for wireless communication...

 strategy in which multiple radio spectrum users can coexist within a single allocation of radio spectrum space. One use of this technique is for primary users of a spectrum allocation to be able to rent out use of unused parts of their allocation to secondary users. Spectrum pooling schemes generally require cognitive radio

Cognitive radio

A cognitive radio is a kind of two-way radio that automatically changes its transmission or reception parameters, in a way where the entire wireless communication network -- of which it is a node -- communicates efficiently, while avoiding interference with licensed or licensed exempt users...

techniques to implement them.