Method and system for localizing interference in spectrum co-existence network

1. A method for sharing spectrum between a primary user and a secondary user, the method comprising:

receiving a signal transmitted by the primary user at a first network equipment of the secondary user;

determining a first attenuation coefficient for the first network equipment;

estimating interference from the first network equipment at a receiver of the primary user wherein estimating interference comprises estimating interference at the receiver of the primary source from the second network equipment, multiplying the first attenuation coefficient by a transmission power of the first network equipment to determine a first interference value, multiplying the second attenuation coefficient by a transmission power of the second network equipment to determine a second interference value, and adding the first interference value and the second interference value to determine an aggregate interference value from the first and second network equipment at the receiver of the primary user;

receiving the signal at a second network equipment of the secondary user;

determining a second attenuation coefficient for the second network equipment;

determining a direction of a source of interference to the primary user by analyzing signals transmitted from the first network equipment and received by the receiver of the primary user;

identifying the source of interference to the primary user as the first network equipment based on the direction of the source of interference;

comparing the aggregate interference value to a predetermined threshold value; and

adjusting parameters of the first network equipment when the estimated interference value exceeds the predetermined threshold value,

wherein determining the first attenuation value includes comparing a transmitted signal power of the first signal to a first received signal strength value of the first network equipment, and

wherein determining the second attenuation value includes comparing the transmitted signal power of the first signal to a second received signal strength value of the second network equipment,

wherein the network parameters include a number of user equipment attached to the first network equipment, and

wherein adjusting parameters includes handing over user equipment attached to the first network equipment to a different network equipment.

2. The method of claim 1 , wherein adjusting parameters of the first network equipment includes reducing the transmission power of the first network equipment so that the estimated interference is below the predetermined threshold value.

3. The method of claim 1 , wherein the first attenuation coefficient is less than the second attenuation coefficient, and wherein adjusting parameters further comprises:

reducing the transmission power of the first network equipment by a first amount; and

reducing the transmission power of the second network equipment by a second amount that is less than the first amount.

4. The method of claim 1 , wherein the first attenuation coefficient is less than the second attenuation coefficient, the method further comprising:

handing over user equipment attached to the first network equipment to the second network equipment to reduce the interference from the first network equipment at the receiver of the primary user.

5. The method of claim 1 , further comprising:

determining timing information for signals transmitted by a second network equipment; and

comparing the timing information to signals received by the primary user to identify the second network equipment as a source of interference.

6. The method of claim 1 , wherein the transmitted signal power is received from the primary user.

7. The method of claim 1 , wherein the primary user is an incumbent user and the signal is a radar transmission.

8. A method for sharing spectrum between a primary user and a secondary user, the method comprising:

receiving a signal transmitted by the primary user at a first network equipment of the secondary user;

determining a first attenuation coefficient for the first network equipment;

estimating interference from the first network equipment at a receiver of the primary user wherein estimating interference comprises estimating interference at the receiver of the primary source from the second network equipment, multiplying the first attenuation coefficient by a transmission power of the first network equipment to determine a first interference value, multiplying the second attenuation coefficient by a transmission power of the second network equipment to determine a second interference value, and adding the first interference value and the second interference value to determine an aggregate interference value from the first and second network equipment at the receiver of the primary user;

receiving the signal at a second network equipment of the secondary user;

determining a second attenuation coefficient for the second network equipment;

determining a direction of a source of interference to the primary user by analyzing signals transmitted from the first network equipment and received by the receiver of the primary user;

identifying the source of interference to the primary user as the first network equipment based on the direction of the source of interference;

comparing the aggregate interference value to a predetermined threshold value; and

adjusting parameters of the first network equipment when the estimated interference value exceeds the predetermined threshold value,

wherein determining the first attenuation value includes comparing a transmitted signal power of the first signal to a first received signal strength value of the first network equipment, and

wherein determining the second attenuation value includes comparing the transmitted signal power of the first signal to a second received signal strength value of the second network equipment,

wherein the first attenuation coefficient is less than the second attenuation coefficient, and wherein adjusting parameters further comprises:

reducing the transmission power of the first network equipment by a first amount; and

reducing the transmission power of the second network equipment by a second amount that is less than the first amount.

9. A method for sharing spectrum between a primary user and a secondary user, the method comprising:

receiving a signal transmitted by the primary user at a first network equipment of the secondary user;

determining a first attenuation coefficient for the first network equipment;

estimating interference from the first network equipment at a receiver of the primary user wherein estimating interference comprises estimating interference at the receiver of the primary source from the second network equipment, multiplying the first attenuation coefficient by a transmission power of the first network equipment to determine a first interference value, multiplying the second attenuation coefficient by a transmission power of the second network equipment to determine a second interference value, and adding the first interference value and the second interference value to determine an aggregate interference value from the first and second network equipment at the receiver of the primary user;

receiving the signal at a second network equipment of the secondary user;

determining a second attenuation coefficient for the second network equipment;

determining a direction of a source of interference to the primary user by analyzing signals transmitted from the first network equipment and received by the receiver of the primary user;

identifying the source of interference to the primary user as the first network equipment based on the direction of the source of interference;

comparing the aggregate interference value to a predetermined threshold value;

adjusting parameters of the first network equipment when the estimated interference value exceeds the predetermined threshold value; and

handing over user equipment attached to the first network equipment to the second network equipment to reduce the interference from the first network equipment at the receiver of the primary user,

wherein determining the first attenuation value includes comparing a transmitted signal power of the first signal to a first received signal strength value of the first network equipment, and

wherein determining the second attenuation value includes comparing the transmitted signal power of the first signal to a second received signal strength value of the second network equipment,

wherein the network parameters include a number of user equipment attached to the first network equipment and the first attenuation coefficient is less than the second attenuation coefficient.