Table 2 Characterization of heterogeneous secondary users
β i | Risk attitudes | Types of secondary users |
|---|---|---|
β i >0 | Risk-seeking | High channel gain, real-time services, |
| Â | Â | urgent messages |
β i <0 | Risk-averse | Low channel gain, non-real-time services, |
| Â | Â | non-urgent messages |
β i =0 | Risk-neutral | Modest channel gain, non-urgent messages |