US 8,576,747 B2 · Distributed scheduling of quiet-period for in-service channel monitoring

Abstract

In a distributed-control cognitive radio network, each secondary user (200) in a network broadcasts parameters (125) that indicate the minimum quiet-period sensing demand for regular quiet-periods that the device requires for reliable detection of a primary user (290). Each device (200) in the network adjusts its quiet-period sensing rate to accommodate the highest minimum sensing demand (155, 160), thereby providing optimal efficiency relative to quiet-period support while assuring that all devices (200) in the network are provided at least their minimum quiet-period sensing demand (150). Both the interval between regular quiet-periods and the duration of these quiet-periods are negotiated among the devices on the network (155). A quiet-period index (140) is used to synchronize all of the devices to a common time base. Techniques are also provided for efficient coordination of on-demand quiet-period requests, and for supporting different quiet-period schedules for multiple classes of primary users.

Claims21

Dependent claims

A method comprising:

determining one or more quiet-period parameters of a first device,
broadcasting the quiet-period parameters,
receiving one or more other quiet-period parameters from a second device,
setting at least one of the quiet-period parameters of the first device equal to at least one of the other quiet-period parameters when a sensing demand of the second device is greater than a sensing rate of the first device,
repeating the broadcasting, receiving, and setting, and
avoiding transmission from the first device during a quiet-period corresponding to the quiet-period parameters of the first device,
wherein the sensing demand of the second device is based on one or more of the quiet-period parameters of the second device, and the sensing rate of the first device is based on one or more of the quiet-period parameters of the first device.

4 more elements

A method comprising:

defining a quiet-period interval at a first device corresponding to a number of transmission units between periodic quiet-periods,
broadcasting a first index corresponding to a phase of a current transmission unit relative to the quiet-period interval,
receiving a second index from a second device,
selectively setting the first index at the first device equal to the second index based on a synchronizing rule that is common to the first device and the second device, the synchronizing rule including setting the first index equal to at least one of:
a minimum of the first index and the second index, and a maximum of the first index and the second index, and
avoiding transmission during a quiet-period based on the first index.

3 more elements

A device comprising:

a receive,
a transmitter,
a processor that is configured to:
define a quiet-period interval corresponding to a number of transmission units between periodic quiet-periods,
broadcast, via the transmitter, an index corresponding to a phase of a current transmission unit relative to the quiet-period interval,
receive, via the receiver, an other index from an other device,
selectively set the index equal to the other index based on a synchronizing rule that is common to the device and the other device, the synchronizing rule including setting the index equal to at least one of:
a minimum of the index and the other index, and a maximum of the index and the other index, and
control the transmitter to avoid transmission during a quiet-period based on the index.

6 more elements

Dependencies are inferred from the claim text.

Distributed scheduling of quiet-period for in-service channel monitoring

Life of this patent

Distributed scheduling of quiet-period for in-service channel monitoring

Life of this patent

Abstract

Claims21