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CLAIMS
1. A spectrum Sharing Controller, comprising:
an interface to a sharable spectrum, wherein the sharable spectrum is assigned to a first hierarchy level;
a processor configured to enable a first entity for accessing at least part of the sharable spectrum on the first hierarchy level,
wherein the processor is configured to assign a second hierarchy level to the at least part of the sharable spectrum accessible to the first entity, and
wherein the processor is configured to enable a second entity for accessing at least part of the sharable spectrum on the second hierarchy level.
2. The spectrum sharing controller of claim 1,
wherein the processor is configured to combine sharable spectrum on multiple identical or distinct hierarchy levels and to enable a third entity for accessing the combined sharable spectrum; and
wherein the processor is further configured to combine sharable spectrum with other types of spectrum including unlicensed spectrum, any type of White Space spectrum, licensed spectrum and/or spectrum under license-by-rule regime.
3. The spectrum sharing controller of claim 1 or 2,
wherein the processor is configured to enable an entity for accessing the sharable spectrum based on at least one of the following: an auction,
an offer at a fixed prize,
accessible for free for a limited amount of time, accessible for another service in return, an offer at a negotiated price, evaluation of achievable target QoS, evaluation of overall efficiency.
4. The Spectrum Sharing Controller of claim 1 or 2, comprising:
an interface with a first tier network, configured to receive a spectrum sharing offer for sharing at least a portion of a radio spectrum assigned to the first tier network;

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an interface with a second tier network, configured to receive a spectrum sharing request for sharing at least the portion of the radio spectrum;
wherein the processor is configured to assign access for the second tier network to at least the portion of the radio spectrum based on a spectrum sharing scheme with respect to the spectrum sharing offer and the spectrum sharing request.
5. The Spectrum Sharing Controller of claim 4,
wherein the spectrum sharing scheme is based on an auction with respect to the spectrum sharing offer and the spectrum sharing request.
6. The Spectrum Sharing Controller of claim 5,
wherein the auction is based on an amount of available spectrum indicated by the spectrum sharing offer and an amount of requested spectrum indicated by the spectrum sharing request.
7. The Spectrum Sharing Controller of claim 4 or 5, comprising:
an interface with a database,
wherein the processor is configured to store information about sharable portions of the radio spectrum in the database.
8. The Spectrum Sharing Controller of claim 7,
wherein the processor is configured to update the database based on assigned portions of the radio spectrum.
9. The Spectrum Sharing Controller of claim 4 or 5,
wherein the processor is configured to provide information about available portions of the radio spectrum to the second tier network and to assign access to the available portions of the radio spectrum based on a confirmation received from the second tier network.
10. The Spectrum Sharing Controller of claim 4 or 5,
wherein the spectrum sharing request is received from the second tier network based on a registration of the second tier network with the Spectrum Sharing Controller.

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11. The Spectrum Sharing Controller of claim 4 or 5,
wherein the portion of the radio spectrum is a portion with respect to time, frequency and/or geographic location.
12. The Spectrum Sharing Controller of claim 4 or 5,
wherein the first tier network and the second tier network are radio networks of a Spectrum Access System (SAS) or radio networks of a Licensed Shared Access System (LSA).
13. A method for spectrum sharing, the method comprising:
receiving a spectrum sharing offer from a first tier network for sharing at least a portion of a radio spectrum assigned to the first tier network;
receiving a spectrum sharing request from a second tier network for sharing at least the portion of the radio spectrum; and
assigning access for the second tier network to at least the portion of the radio spectrum based on a spectrum sharing scheme with respect to the spectrum sharing offer and the spectrum sharing request.
14. The method of claim 13,
wherein the spectrum sharing scheme is based on an auction with respect to the spectrum sharing offer and the spectrum sharing request.
15. A Spectrum Sharing Controller circuit, comprising:
an interface with a plurality of radio networks, configured to receive a spectrum sharing offer from at least one first radio network of the plurality of radio networks for sharing at least a portion of a radio spectrum assigned to the at least one first radio network, and configured to receive a spectrum sharing request from at least one second radio network of the plurality of radio networks for sharing at least the portion of the radio spectrum; and
a processor configured to assign access for the at least one second radio network to at least the portion of the radio spectrum based on a spectrum sharing scheme with respect to the spectrum sharing offer and the spectrum sharing request.

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16. The Spectrum Sharing Controller circuit of claim 15,
wherein the spectrum sharing scheme is based on an auction with respect to the spectrum sharing offer and the spectrum sharing request.
17. A device for spectrum sharing, the device comprising:
means for receiving a spectrum sharing offer from a first tier network for sharing at least a portion of a radio spectrum assigned to the first tier network;
means for receiving a spectrum sharing request from a second tier network for sharing at least the portion of the radio spectrum; and
means for assigning access for the second tier network to at least the portion of the radio spectrum based on a spectrum sharing scheme with respect to the spectrum sharing offer and the spectrum sharing request.
18. The device of claim 17,
wherein the spectrum sharing scheme is based on an auction with respect to the spectrum sharing offer and the spectrum sharing request.
19. A Spectrum Sharing System, comprising:
A Spectrum Access System (SAS) configured to share a radio spectrum between an incumbent first tier network, a priority access license (PAL) second tier network and a generalized authorized access (GAA) third tier network; and a Spectrum Sharing Controller, comprising:
an interface with the second tier network, configured to receive a spectrum sharing offer for sharing at least a portion of the radio spectrum assigned to the second tier network;
an interface with the third tier network, configured to receive a spectrum sharing request for sharing at least the portion of the radio spectrum; and
a processor configured to assign access for the third tier network to at least the portion of the radio spectrum based on a spectrum sharing scheme with respect to the spectrum sharing offer and the spectrum sharing request.

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20. The Spectrum Sharing System of claim 19,
wherein the spectrum sharing scheme is based on an auction with respect to the spectrum sharing offer and the spectrum sharing request.
21. A Spectrum Sharing System, comprising:
A Licensed Shared Access (LSA) system configured to share a radio spectrum between an incumbent first tier network and a licensed second tier network; and a Spectrum Sharing Controller, comprising:
an interface with the first tier network, configured to receive a spectrum sharing offer for sharing at least a portion of the radio spectrum assigned to the first tier network;
an interface with the second tier network, configured to receive a spectrum sharing request for sharing at least the portion of the radio spectrum; and
a processor configured to assign access for the second tier network to at least the portion of the radio spectrum based on a spectrum sharing scheme with respect to the spectrum sharing offer and the spectrum sharing request.
22. The Spectrum Sharing System of claim 21,
wherein the spectrum sharing scheme is based on an auction with respect to the spectrum sharing offer and the spectrum sharing request.
23. A computer readable non-transitory medium on which computer instructions are stored which when executed by a computer cause the computer to perform the method of claim 13 or 14.
24. A user equipment, UE, comprising:
a receiver, configured to receive a query from an access point or a Citizen Broadband Radio Service (CBSD), wherein the query indicates a compatibility of a sharable spectrum and/or an intention to use the sharable spectrum; and
a transmitter, configured to transmit an answer to the query, the answer comprising an acknowledgement or a decline for using the sharable spectrum.

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25. The UE of claim 24,
wherein the compatibility indicates if the UE is compatible to Spectrum Access System (SAS) bands and/or services of the access point or CBSD.