Technique and apparatus for cognitive radio access to a brokered spectrum
AssigneeMotorola, Inc.
InventorsEdgar H. Callaway, JR., Dvid B. Taubenheim
Life of this patent
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Abstract
A technique (300) and apparatus for sharing frequency spectrum amongst cognitive radios, without the use of a centralized control, is provided. By determining open segments of available spectrum within a brokered spectrum (306), and determining costs associated with those available segments (307), a CR device can identify an optimal spectral portion (308) within which to transmit (314) and grow (342) a narrowband signal. The occupied bandwidth growth is monitored such that cost associated with the growth does not exceed a cost threshold (341).
Claims24
A channel access technique for a cognitive radio (CR) device in a cognitive radio system, comprising:
- determining open spectrum segments of a brokered radio frequency spectrum;
- identifying a portion of the open spectrum within which to transmit a narrow-bandwidth signal based on cost criteria;
- transmitting a narrow-bandwidth signal one spectral quantum in width, within the identified portion of spectrum;
- growing the transmitted signal while maintaining the cost criteria within a cost criteria threshold in conjunction with maintaining fence quantum with neighboring spectral devices within the system;
- and
- trading occupancy of fence quantum with neighboring spectral devices, at a rate inversely proportional to occupied bandwidth.
A method for accessing spectrum by a cognitive radio (CR) device, comprising the steps of:
- determining that spectrum has been made available from a spectrum broker;
- determining a lowest cost portion of the available spectrum within which to send a transmission;
- transmitting a narrow-bandwidth signal, one spectral quantum in width, within the lowest-cost portion of available spectrum;
- and
- growing the transmitted signal as a function of occupied bandwidth.
A cognitive radio (CR) network, comprising:
- a plurality of CR devices transmitting signals within open spectrum to produce an economic equilibrium of transmitted signals in which CR devices having higher cost tolerances associated with the open spectrum spend proportionally more for the spectrum, either by occupying a larger bandwidth, or by paying more for an equivalent bandwidth of more costly, but more desirable, spectrum.
A cognitive radio (CR) network, comprising:
- a plurality of CR devices operating within a brokered spectrum, each CR device determining open spectrum segments and a cost associated therewith, each CR device selecting a desired portion of open spectrum based upon cost and each CR device transmitting and growing a narrowband signal within its respective selected open spectrum, wherein a CR device of the plurality of CR devices grows its respective narrowband signal until an occupied bandwidth proportional to a cost tolerance threshold associated with the selected portion of open spectrum is met.
Dependencies are inferred from the claim text.