Table 1 Table 1

Frame length

Channel sensing time

Probability of sensing false alarm

Probability of sensing miss detection

Traffic load parameters of licensed user

Noise power

State space

Composite state space of channels

State space of channel

Space of sensing results

State space of user

Composite state space of channels for user

State space of channel for useri

Transmission rate space

Bit error rate

Steady state probability

Steady state probability of user

Access action set of user

Transmission rate space of user

Action space of user .

Action space of whole CR network

Sensing result at the beginning of th frame

Mapping from the number of packets to transmission rate

Minimum transmission power to achieve a specified BER for channel state and transmission rate .

Immediate reward of user

Immediate power consumption of user

Expected reward of whole CR network

Expected power consumption of user

average power consumption threshold of user

System state in th decision period

The set of centralized policies

Action choice for state according to policy

The set of decentralized policies

Optimal policy

Occupation measure

Local occupation measure of CR user

Optimal occupation measure

Optimal local occupation measure of CR user

State space based on state aggregation of

State space based on state aggregation of

Maximal Doppler frequency of th channel for user

Average SNR

Duration probability

Point probability

State transition probability of

State transition probability of

Transition probability of

Cartesian product