1. A system for managing utilization of un-licensed frequency spectrum resources for secondary systems (203), comprising circuitry, configured to assign a first un-licensed frequency spectrum resource in an availability time period to a first secondary system (203); and reassign at least part of the first un-licensed frequency spectrum resource during the availability time period to a second secondary system (203) based on the current resource utilization by the first and the second secondary system (203), wherein the circuitry is configured to assign and reassign the first un-licensed frequency spectrum resource under protection of a primary system which has a licensed frequency spectrum usage right.

2. The system according to Claim 1, wherein the circuitry is configured to reconfigure operational parameters of the first secondary system (203) to reassign the at least part of the first un-licensed frequency spectrum resource.

3. The system according to Claim 2, wherein the operational parameters comprise available frequency and associated maximum transmit power, and the circuitry is configured to reconfigure frequency and/or transmit power of the first secondary system (203) to reassign the at least part of the first un-licensed frequency spectrum resource.

4. The system according to Claim 1, wherein the circuitry is further configured to determine the current resource utilization of the first un-licensed frequency spectrum resource by the first secondary system (203), reassign the at least part of the first un-licensed frequency spectrum resource in case that the at least part of the first un-licensed frequency spectrum resource is unused by the first secondary system (203) wherein the at least part of the first un-licensed frequency spectrum resource is released by the first secondary system (203) before the availability time period expires.

5. The system according to claim 1, wherein the circuitry assigns available frequency and associated maximum transmit power to the first secondary system (203) as the first un-licensed frequency spectrum resource without intolerable interference to the primary system.

6. The system according to Claim 1, wherein the circuitry is further configured to control interference to other secondary systems (203) when reassign the at least part of first un-licensed frequency spectrum resource to the second secondary system (203).

7. The system according to Claim 1, wherein the circuitry is configured to transmit, to the first secondary system (203), spectrum adjustment information that indicates the at least part of the first un-licensed frequency spectrum resource no longer available to the first secondary system (203) wherein the spectrum adjustment information comprises identity information of the first secondary system (203), the at least part of the first un-licensed frequency spectrum resource unavailable to the first secondary system (203) and/or a second un-licensed frequency spectrum resource assigned to the first secondary system (203).

8. The system according to Claim 1, wherein the circuitry is configured to reassign the first un-licensed frequency spectrum resource to the second secondary system (203) based on location of the second secondary system (203), wherein the circuitry is configured to identify before assigning the at least part of the first un-licensed frequency spectrum resources to the second secondary system (203), based on the location, that the at least part of the first un-licensed frequency spectrum resource is available to the second secondary system (203), the at least part of the first un-licensed frequency spectrum resource is available to the second secondary system (203) when utilization of the at least part of the first un-licensed frequency spectrum resource by the second secondary system (203) at the location causes interference under tolerance of the primary system.

9. The system according to Claim 8, wherein the circuitry is configured to determine available frequency spectrum resource of the second secondary system (203), and identify the at least part of first un-licensed frequency spectrum resource available to the second secondary system (203) if the at least part of first un-licensed frequency spectrum resource is comprised in the available frequency spectrum resource, the available frequency spectrum resource comprises frequencies and associated maximum transmit power calculated based on the location, which can be used by the second secondary system (203) under protection of the primary system.

10. The system according to Claim 8, wherein the at least part of the first un-licensed frequency spectrum resource is available to the second secondary system (203) when utilization of the at least part of the first un-licensed frequency spectrum resource by the second secondary system (203) at the location causes interference under tolerance of the primary system and other secondary systems (203).

11. The system according to Claim 8, wherein the circuitry is configured to receive request for un-licensed frequency spectrum resource from the second secondary system (203), and determine the second secondary system (203) as object to reassign the at least part of the first un-licensed frequency spectrum resource to.

12. The system according to claim 8, wherein the circuitry is configured to receive request for un-licensed frequency spectrum resource from a third secondary system (203), reassign a second un-licensed frequency spectrum resource occupied by the second secondary system (203) to the third secondary system (203) and reassign the at least part of the first un-licensed frequency spectrum resource to the second secondary system (203) if the at least part of the first un-licensed frequency spectrum resource can't be reassigned to the third secondary system (203) for causing intolerable interference to other systems.

13. A system, comprising: circuitry, configured to determine a first un-licensed frequency spectrum resource available to the system in an availability time period; receive a spectrum adjustment information during the availability time period that indicates at least part of the first un-licensed frequency spectrum resource no longer available to the system or based on the current resource utilization by a first and a second secondary system (203); and change operational parameters of the system based on the spectrum adjustment information, wherein the system operates on the first un-licensed frequency spectrum resource under protection of a primary system which has a licensed frequency spectrum usage right.

We Claim:
1. A system for managing utilization of un-licensed frequency spectrum
resources for secondary systems (203), comprising
circuitry, configured to
assign a first un-licensed frequency spectrum resource in an availability time period to a first secondary system (203); and
reassign at least part of the first un-licensed frequency spectrum resource during the availability time period to a second secondary system (203) based on the current resource utilization by the first and the second secondary system (203),
wherein the circuitry is configured to assign and reassign the first un-licensed frequency spectrum resource under protection of a primary system which has a licensed frequency spectrum usage right.
2. The system according to Claim 1, wherein the circuitry is configured to reconfigure operational parameters of the first secondary system (203) to reassign the at least part of the first un-licensed frequency spectrum resource.
3. The system according to Claim 2, wherein the operational parameters comprise available frequency and associated maximum transmit power, and the circuitry is configured to reconfigure frequency and/or transmit power of the first secondary system (203) to reassign the at least part of the first un-licensed frequency spectrum resource.
4. The system according to Claim 1, wherein the circuitry is further configured to determine the current resource utilization of the first un-licensed frequency spectrum resource by the first secondary system (203), reassign the at least part of the first un-licensed frequency spectrum resource in case that the at least part of the first un-licensed frequency spectrum resource is

unused by the first secondary system (203) wherein the at least part of the first un-licensed frequency spectrum resource is released by the first secondary system (203) before the availability time period expires.
5. The system according to claim 1, wherein the circuitry assigns available frequency and associated maximum transmit power to the first secondary system (203) as the first un-licensed frequency spectrum resource without intolerable interference to the primary system.
6. The system according to Claim 1, wherein the circuitry is further configured to control interference to other secondary systems (203) when reassign the at least part of first un-licensed frequency spectrum resource to the second secondary system (203).
7. The system according to Claim 1, wherein the circuitry is configured to transmit, to the first secondary system (203), spectrum adjustment information that indicates the at least part of the first un-licensed frequency spectrum resource no longer available to the first secondary system (203) wherein the spectrum adjustment information comprises identity information of the first secondary system (203), the at least part of the first un-licensed frequency spectrum resource unavailable to the first secondary system (203) and/or a second un-licensed frequency spectrum resource assigned to the first secondary system (203).
8. The system according to Claim 1, wherein the circuitry is configured to reassign the first un-licensed frequency spectrum resource to the second secondary system (203) based on location of the second secondary system (203), wherein the circuitry is configured to identify before assigning the at least part of the first un-licensed frequency spectrum resources to the second secondary system (203), based on the location, that the at least part of the first un-licensed frequency spectrum resource is available to the second secondary system (203), the at least part of the first un-licensed frequency

spectrum resource is available to the second secondary system (203) when utilization of the at least part of the first un-licensed frequency spectrum resource by the second secondary system (203) at the location causes interference under tolerance of the primary system.
9. The system according to Claim 8, wherein the circuitry is configured to determine available frequency spectrum resource of the second secondary system (203), and identify the at least part of first un-licensed frequency spectrum resource available to the second secondary system (203) if the at least part of first un-licensed frequency spectrum resource is comprised in the available frequency spectrum resource, the available frequency spectrum resource comprises frequencies and associated maximum transmit power calculated based on the location, which can be used by the second secondary system (203) under protection of the primary system.
10. The system according to Claim 8, wherein the at least part of the first un-licensed frequency spectrum resource is available to the second secondary system (203) when utilization of the at least part of the first un-licensed frequency spectrum resource by the second secondary system (203) at the location causes interference under tolerance of the primary system and other secondary systems (203).
11. The system according to Claim 8, wherein the circuitry is configured to receive request for un-licensed frequency spectrum resource from the second secondary system (203), and determine the second secondary system (203) as object to reassign the at least part of the first un-licensed frequency spectrum resource to.
12. The system according to claim 8, wherein the circuitry is configured to receive request for un-licensed frequency spectrum resource from a third secondary system (203), reassign a second un-licensed frequency spectrum resource occupied by the second secondary system (203) to the third

secondary system (203) and reassign the at least part of the first un-licensed frequency spectrum resource to the second secondary system (203) if the at least part of the first un-licensed frequency spectrum resource can't be reassigned to the third secondary system (203) for causing intolerable interference to other systems.
13. A system, comprising:
circuitry, configured to
determine a first un-licensed frequency spectrum resource available to the system in an availability time period;
receive a spectrum adjustment information during the availability time period that indicates at least part of the first un-licensed frequency spectrum resource no longer available to the system or based on the current resource utilization by a first and a second secondary system (203); and
change operational parameters of the system based on the spectrum adjustment information,
wherein the system operates on the first un-licensed frequency spectrum resource under protection of a primary system which has a licensed frequency spectrum usage right.