| 主权项 |
1. A method for choosing the sequence of bursts of an access pattern in the primary network of a cognitive wireless network comprising a primary and a secondary network, wherein this access pattern comprises an alternation of listen periods and signaling transmission periods, these periods having various Lengths;
comprising the computing a random integer X, and then generating a sequence of bursts corresponding to the computed random integer X;wherein it comprises:
choosing a number p between 0 and 1 as a function of the wanted collision rate and choosing an integer L chosen of order loglog of the maximum size N of the primary network, these parameters p and L being common to, all devices in the primary network; computing a random integer X having a geometric distribution with a probability p; when X<kL, letting m1, m2, . . . , mi, . . . , mL be the sequence that is encoded by X in a given base k; mi being integers chosen between 0 and k−1; then deriving a preamble sequence from this integer sequence by taking BS(k−1−m1), BS(k−1−m2), . . . , BS(k−1−mL) as a preamble sequence, where BS(u) is the binary k-sequence which encodes the number u, u being an integer between 0 and k−1. |
