METHOD AND APPARATUS FOR SENSING PRESENCE OF AN INCUMBENT SIGNAL ON A SECONDARY RADIO CHANNEL
First Claim
Patent Images
1. A method for determining the presence of an incumbent signal on a secondary radio channel, the method comprising:
- establishing a communication link over the secondary radio channel between a remote station and a base station;
determining a channel estimate and a noise estimate of the secondary channel at the remote station based on a signal received from the base station;
selecting at least one of a plurality of sensing methods available to the remote station, wherein the selecting is determined by at least one of the channel estimate and the noise estimate;
performing the at least one of the sensing methods by the remote station, wherein each of the at least one of the sensing methods provides a result;
providing the result of the at least one of the sensing methods to a decision block of the remote station; and
determining at the decision block whether an incumbent signal is present on the secondary channel based on the result of the at least one of the sensing methods.
2 Assignments
0 Petitions
Accused Products
Abstract
A remote station communicates with a base station over a secondary radio channel. During communication, the remote station determines channel conditions of the secondary radio channel. Based on the channel conditions, the remote station selects one or more sensing methods to be performed on the secondary radio channel. The result of performing the sensing method is used to determining whether an incumbent signal is present on the secondary radio channel.
-
Citations
20 Claims
-
1. A method for determining the presence of an incumbent signal on a secondary radio channel, the method comprising:
-
establishing a communication link over the secondary radio channel between a remote station and a base station; determining a channel estimate and a noise estimate of the secondary channel at the remote station based on a signal received from the base station; selecting at least one of a plurality of sensing methods available to the remote station, wherein the selecting is determined by at least one of the channel estimate and the noise estimate; performing the at least one of the sensing methods by the remote station, wherein each of the at least one of the sensing methods provides a result; providing the result of the at least one of the sensing methods to a decision block of the remote station; and determining at the decision block whether an incumbent signal is present on the secondary channel based on the result of the at least one of the sensing methods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A cognitive radio apparatus, comprising:
-
a channel estimator which produces a channel estimate during radio communication with a base station from a signal received from the base station over a secondary radio channel, the channel estimate indicating a channel condition of the secondary radio channel; a noise estimator which produces a noise estimate of the secondary radio channel based on the signal received from the base station, the noise estimate indicating a noise condition of the secondary channel; a sensing method selector which selects at least one of a plurality of sensing methods available to the cognitive radio apparatus based on at least one of the channel estimate and the noise estimate; and a decision block which evaluates a result of each of the at least one of the sensing methods selected by the sensing method selector to determine whether an incumbent signal is present on the secondary radio channel. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A method for determining whether a secondary radio channel has become occupied by an incumbent signal, the method comprising:
-
establishing a communication link between a mobile station and a base station over the secondary radio channel after an initial determination that the secondary radio channel is free of an incumbent signal; receiving an information signal at the mobile station from the base station, the information signal including information being rendered in a manner perceivable by a user of the mobile station, the information signal further including reference information embedded in the information signal; determining a channel estimate of the secondary radio channel based on the reference information embedded in the information signal, the channel estimate indicating a fading type and a fading rate of the secondary radio channel; determining a noise estimate of the secondary radio channel based on the information signal; determining a likely incumbent signal type based on a spectral location of the secondary radio channel; selecting at least one sensing method from a plurality of sensing methods available to the mobile station, based on the fading type channel estimate, noise estimate, and likely incumbent signal type, including configuring parameters of the at least one sensing method based on the channel estimation and noise estimation; performing the at least one sensing method on a received sample of the secondary radio channel when the mobile station is not receiving a signal from the base station on the secondary radio channel to produce a sensing result for each of the at least one sensing method; and determining whether an incumbent signal is present on the secondary radio channel based on the sensing result of each of the at least one sensing method. - View Dependent Claims (19, 20)
-
Specification