Picocell range expansion configuration on authorized shared access

1. A method, comprising:

determining, in a controller, at least one allowable maximal range expansion bias value for at least one picocell within a coverage area of a macrocell; and

sending the determined at least one allowable maximal range expansion bias value for the at least one picocell from the controller to the macrocell.

2. The method of claim 1 , wherein the determining is based on at least one of an interference consideration, locations of the at least one picocell, and at least one currently used range expansion bias value for the at least one picocell.

3. The method of claim 1 , wherein the determining is triggered by the controller receiving an indication that a carrier frequency is to be reutilized by a primary system.

4. The method of claim 1 , wherein the controller is configured as an authorized shared access controller.

5. The method of claim 1 , wherein the sending the at least one allowable maximal range expansion bias value for the at least one picocell comprises sending at least one respective value in combination with at least one corresponding picocell identification code for the at least one picocell.

6. The method of claim 1 , wherein the determining is based on a report received from the macrocell, wherein the report comprises at least one of at least one picocell identification code within the coverage area of the at least one macrocell, locations of the at least one picocell, and at least one currently used range expansion bias value for the at least one picocell.

7. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code,

wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to

determine, in a controller, at least one allowable maximal range expansion bias value for at least one picocell within a coverage area of a macrocell; and

send the determined at least one allowable maximal range expansion bias value for the at least one picocell from the controller to the macrocell.

8. The apparatus of claim 7 , wherein the determining is based on at least one of an interference consideration, locations of the at least one picocell, and at least one currently used range expansion bias value for the at least one picocell.

9. The apparatus of claim 7 , wherein the determining is triggered by the controller receiving an indication that a carrier frequency is to be reutilized by a primary system.

10. The apparatus of claim 7 , wherein the controller is configured as an authorized shared access controller.

11. The apparatus of claim 7 , wherein the sending the at least one allowable maximal range expansion bias value for the at least one picocell comprises sending at least one respective value in combination with at least one corresponding picocell identification code for the at least one picocell.

12. The apparatus of claim 7 , wherein the determining is based on a report received from the macrocell, wherein the report comprises at least one of at least one picocell identification code within the coverage area of the at least one macrocell, locations of the at least one picocell, and currently used range expansion bias vales for the at least one picocell.

13. A method, comprising:

receiving at least one allowable maximal range expansion bias value for at least one picocell from a controller; and

updating, by a macrocell, at least one range expansion bias value for at least one picocell within a macrocell based on the received at least one allowable maximal range expansion bias value.

14. The method of claim 13 , further comprising:

reporting a list comprising at least one of at least one picocell identification code corresponding to the at least one picocell within a coverage area of the macrocell, locations of the at least one picocell, and at least one currently used range expansion bias value for the at least one picocell, wherein the at least one allowable maximal range expansion bias value is received in response to the list.

15. The method of claim 14 , further comprising:

receiving instructions to reduce transmit power of the macrocell on a carrier frequency, wherein the reporting the list is responsive to the received instructions.

16. The method of claim 13 , wherein the macrocell comprises an evolved Node B.

17. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code,

wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to

receive at least one allowable maximal range expansion bias value for at least one picocell from a controller; and

update, by a macrocell, at least one range expansion bias value for at least one picocell within a macrocell based on the at least one received allowable maximal range expansion bias value.

18. The apparatus of claim 17 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to report a list of at least one of at least one picocell identification code corresponding to the at least one picocell within a coverage area of the macrocell, locations of the at least one picocell, and at least one currently used range expansion bias value for the at least one picocell, wherein the at least one allowable maximal range expansion bias value is received in response to the list.

19. The apparatus of claim 18 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to receive instructions to reduce transmit power of the macrocell on a carrier frequency, wherein the reporting the list is responsive to the received instructions.

20. The apparatus of claim 17 , wherein the macrocell comprises an evolved Node B.