Method for Preventing Co-Channel Operation with Radar Systems

• US 20090086684A1
• Filed: 10/02/2007
• Published: 04/02/2009
• Est. Priority Date: 10/02/2007
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kelly, Robert P., Wilson, Timothy, Smith, Brian K.
• Granted Patent: US 8,179,862 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

A method for preventing co-channel operation with a radar system includes the steps of setting a state of a first communication channel to active, connecting to a first wireless access point on the first communication channel, passively scanning at least a second communication channel for communication from a second wireless access point, setting a state of the second channel to active if frames are received on the second channel, determining whether an elapsed time since frames were received on at least one of the first channel and the second channel has exceed a predefined value, and in response to the predefined value being exceeded for at least one of the first channel and the second channel, setting the state of a corresponding one of the first channel and the second channel to passive.

Claims

1. A method for preventing co-channel operation with a radar system, the method comprising:

setting a state of a first communication channel to active;

connecting to a first wireless access point on the first communication channel;

passively scanning at least a second communication channel for communication from a second wireless access point;

setting a state of the second channel to active if frames are received on the second channel;

determining whether an elapsed time since frames were received on at least one of the first channel and the second channel has exceed a predefined value; and

in response to the predefined value being exceeded for at least one of the first channel and the second channel, setting the state of a corresponding one of the first channel and the second channel to passive.

2. The method according to claim 1, further comprising:

determining whether a signal quality value of at least one of the first wireless access point and the second wireless access point exceeds a predetermined minimum value; and

setting all communication modes to passive in response to determining that the signal quality value of the at least one of the first wireless access point and the second wireless access point does not exceed the predetermined minimum value.

3. The method according to claim 2, further comprising:

entering a low-power sleep mode for a predetermined amount of time in response to the signal quality exceeding the predetermined minimum value; and

upon expiration of the predetermined amount of time, passively scanning at least a third communication channel for communication from the second wireless access point.

4. The method according to claim 1, further comprising:

in response to the predefined value not being exceeded for at least one of the first channel and the second channel, determining whether a signal quality value exceeds a predetermined minimum value.

5. The method according to claim 1, further comprising:

assigning a timestamp value in response to setting the state of the second channel to active.

6. The method according to claim 5, wherein the elapsed time comprises:

a difference between a current time value and the timestamp value.

7. A device for preventing co-channel operation with a radar system, the device comprising:

a timer;

a transceiver operable to communicate on a plurality of channels to a plurality of access points; and

a processor communicatively coupled to the processor and to the timer, the processor operable to;

set a state of a first communication channel to active;

connect with the transceiver to a first wireless access point on the first communication channel;

passively scan with the transceiver at least a second communication channel for communication from a second wireless access point;

set a state of the second channel to active if frames are received on the second channel;

determine with the timer whether an elapsed time since frames were received on at least one of the first channel and the second channel has exceed a predefined value; and

in response to the predefined value being exceeded for at least one of the first channel and the second channel, setting the state of a corresponding one of the first channel and the second channel to passive.

8. The device according to claim 7, wherein the processor is further operable to:

determine whether a signal quality value exceeds a predetermined minimum value in response to the predefined value not being exceeded for at least one of the first channel and the second channel.

9. The device according to claim 8, wherein the processor is further operable to:

enter a low-power sleep mode for a predetermined amount of time; and

passively scan at least a third communication channel for communication from a second wireless access point upon expiration of the predetermined amount of time.

10. The device according to claim 7, wherein the processor is further operable to:

assign a timestamp value in response to setting the state of the second channel to active.

11. The device according to claim 10, wherein the elapsed time comprises:

a difference between a current time value and the timestamp value.

12. A method for preventing co-channel operation with a radar system, the method comprising:

identifying at least one channel as one of a passive channel and a radar channel;

performing a passive scan on the identified channels;

receiving, from a first wireless access point, a first flame on at least one of the identified channels;

setting a state of the at least one of the identified channels to active;

initializing a timestamp for the at least one of the identified channels;

determining whether an elapsed time has passed since a second frame has been received on the at least one of the identified channels; and

in response to the elapsed time being passed, setting the state of the at least one of the identified channels to passive.

13. The method according to claim 12, further comprising:

in response to the elapsed time not being passed, determining whether a signal quality value exceeds a predetermined minimum value.

14. The method according to claim 13, further comprising:

entering a low-power sleep mode for a predetermined amount of time; and

upon expiration of the predetermined amount of time, passively scanning at least one communication channel for communication from a second wireless access point.

15. The method according to claim 12, further comprising.

assigning a timestamp value in response to setting a state of the at least one of the identified channels to active.

16. The method according to claim 15, wherein the elapsed time comprises:

a difference between a current time value and the timestamp value.