Patent ID: 8463188

Claim:
A method for spectrum access, comprising: estimating channel parameters of primary channels according to the Markov model used by the primary channels; selecting a primary channel with a largest available bandwidth according to the estimated channel parameters; and detecting the selected primary channel, and transmitting data through the selected primary channel if the primary channel is idle; wherein if the Markov model used b the primary channel is discrete-time Markov model, the step of estimating the channel parameters of the primary channels according to the Markov model used b the primary channel comprises: performing sampling according to a number of an initial sample and obtaining rough channel parameters according to an initial sampling result; obtaining a specific number of samples required by the system according to the rough channel parameters estimation precision required by the system and standard normal distribution function; performing left sampling according to the specific number of samples required by the system, and the number of the initial sample which has been performed; obtaining an overall sampling result; and obtaining a channel parameter with the estimation precision required by the system according to the specific number of samples and the overall sampling result; wherein if the primary channels use a continuous-time Markov model, the primary channel with the largest available bandwidth is confirmed according to a formula of i * = arg ⁢ ⁢ max i = 1 , … ⁢ , N ⁢ ⁢ 1 λ yi ( 1 λ xi + 1 λ yi ) ⁢ B i , wherein, B i represents the bandwidth of the primary channel I, and λ xi and λ yi represents channel parameters of the primary channel I; and if the primary channels use a discrete-time Markov model, the primary channel with the largest available bandwidth is selected according to a formula of i * = arg ⁢ ⁢ max i = 1 , … ⁢ , N ⁢ ( μ i ⁢ β i + ( 1 - μ i ) ⁢ α i ) ⁢ B i wherein B i , represents the bandwidth of the primary channel i, μ i represents probability that a secondary user uses the primary channel and i; α i and β i represents channel parameters of the primary channel i.