Patent ID: 8406776
Filing Date: 2013-03-26
Classification: H04L

Abstract:
1. A method of searching for free band using a cognitive telecommunication terminal operating in a zone covered by a primary telecommunication system using a plurality of frequency bands, wherein said terminal: calculates, for each band of said plurality, a conditional probability that this band is not occupied, knowing a first set of bands already occupied by the primary telecommunication system and knowing a second set of bands not occupied by the primary telecommunication system but already used by another cognitive terminal, classifies said bands as a function of the conditional probabilities thus calculated; and searches for a free band starting with the band with the highest conditional probability and measuring therein a power of a signal from the primary telecommunication system, wherein said zone is partitioned into elementary zones and, for each given band, and wherein said conditional probability of not being occupied by the primary telecommunication system, called the conditional probability of being available, is calculated from the corresponding probabilities that the different bands are available inside the different elementary zones and the corresponding areas of these zones in which said given band is available.