Method for opportunistic access to the spectrum

A non-transitory computer-readable medium comprising a computer program product stored thereon and having an executable code for implementing a method of opportunistic access to a frequency band when the code is executed by a processor of a secondary user device, wherein the frequency band is dedicated to a synchronous primary network, and the frequency band is divided into a number of K independent channels, an indicator Bk and an average availability Sk being assigned to each channel k from the K independent channels, wherein said executable code comprising:

• executable code that configures the secondary user device, at each time frame t to:
• observe a channel i having a greatest indicator Bi(t),
• update an average availability Si of the channel i,
• when the channel i is free:
• set up a data transmission during the time frame t, on the channel i, between the secondary user device and a distant user device, and
• compute a quality index Ri (t) of the channel i, and
• update indicators Bk (t) of the K independent channels as a function of the average availabilities Sk, of the quality index Ri (t) and as a function of a bias Ak (t) computed for each channel k.

A communications device comprising:

• a radiocommunications device;
• at least one battery;
• at least one computer;
• memory;
• at least one sensor capable of observing the availability of a frequency channel;
• and
• a computer program product stored in the memory and having an executable code for implementing a method of opportunistic access to a frequency band when the code is executed by the at least one computer, wherein the frequency band is dedicated to a synchronous primary network, and the frequency band is divided into a number of K independent channels, an indicator Bk and an average availability Sk being assigned to each channel k from the K independent channels, and wherein the executable code comprises:
• executable code that configures the communications device, at each time frame t to:
• observe a channel i having a greatest indicator Bi(t),
• update an average availability Si of the channel i,
• when the channel i is free:
• set up a data transmission during the time frame t, on the channel i, between the secondary user device and a distant user device, and
• compute a quality index Ri (t) of the channel i, and
• update indicators Bk (t) of the K independent channels as a function of the average availabilities Si, of the quality index Ri (t) and as a function of a bias Ak (t) computed for each channel k.