US 7,548,750 B2Granted

System and method for detection of primary spectrum users

AssigneeCisco Technology, Inc.

InventorsJohannes P. Kruys, Christopher G. Meil

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Abstract

An external primary spectrum user detector (ESUD) is used to take over the role of integral radar detectors, and relieve user devices of the constraints associated with Primary Spectrum User detection. The ESUD can establish a relationship with the user devices by means of a cryptographic signature. The ESUD installation includes assigning it a frequency band to scan for primary spectrum user signals and the type of signals to be detected. Once activated, the ESUD will scan its assigned frequencies and emit to types of messages, “All Clear” and “Primary Spectrum User detected.” User devices on the network listen for the ESUD messages. In the absence of messages from the ESUD, the user devices activate their internal primary spectrum user detectors until ESUD messages are received.

Claims10

Dependent claims

A wireless device, comprising:

a wireless transceiver;
dynamic frequency selection logic coupled to the wireless transceiver for selecting an operating frequency for the wireless transceiver;
a network interface coupled to the dynamic frequency selection logic and responsive to receiving a signal from a remote primary spectrum user detector to forward the signal from the remote primary spectrum user detector to the dynamic frequency selection logic;
a timer coupled to the network interface for determining the elapsed time from the last signal received from the remote primary spectrum user detector;
and
primary spectrum user detection logic coupled to the timer and the dynamic frequency selection logic responsive to the timer to activate after a predetermined time has elapsed;
wherein the dynamic frequency selection logic is responsive to the signal from the remote primary spectrum user detector for selecting the operating frequency for the wireless transceiver;
and
wherein the dynamic frequency selection logic is responsive to the primary spectrum user detection logic for selecting the operating frequency while the primary spectrum user detection logic is active.

6 more elements

A wireless device, comprising:

means adapted for sending and receiving wireless signals;
dynamic frequency selection means coupled to the means adapted for sending and receiving wireless signals for selecting an operating frequency for the means adapted for sending and receiving wireless signals;
means adapted for communicating on a network coupled to the dynamic frequency selection means and responsive to receiving a signal from a remote primary spectrum user detector to forward the signal from the remote primary spectrum user detector to the dynamic frequency selection means;
timing means for determining the elapsed time from the last signal received from the remote primary spectrum user detector coupled to the network interface;
and
primary spectrum user detection means coupled to the timing means and the dynamic frequency selection means responsive to the timing means to activate after a predetermined time has elapsed and no signal has been received from the remote primary spectrum user detector, the primary spectrum user detection means remaining active until a signal is received from the remote primary spectrum user detector;
wherein the dynamic frequency selection means is responsive to the signal from the remote primary spectrum user detector for selecting the operating frequency for the wireless transceiver;
and
wherein the dynamic frequency selection means is responsive to the primary spectrum user means for selecting the operating frequency while the primary spectrum user means is active.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/225,719Filed 13 Sep 2005
Published: US 2007/0060065 A115 Mar 2007
Granted: 16 Jun 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01S 7/021
Of systems according to group G01S13/00: auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
H04W 48/16
Access restriction ; Network selection; Access point selection: discovering, processing access restriction or access information
H04W 16/14
Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures: spectrum sharing…
H04W 74/08
Wireless channel access: non-scheduled access, e.g. ALOHA