METHOD FOR QUIETING AND SENSING IN A SECONDARY COMMUNICATIONS SYSTEM
First Claim
1. A method of performing sensing for incumbent signals in a secondary communications system, the method comprising:
- determining whether an unused portion of an active communications channel meets an incumbent detection interference requirement at a sensing unit; and
if the incumbent detection interference requirement is satisfied on the unused portion of the active communications channel, performing incumbent signal sensing over the unused portion of the active communications channel at the sensing unit.
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Accused Products
Abstract
A method of retaining channel use by a secondary system is described. A secondary channel used during periods of normal communication between a secondary transmitter and receiver is split into sub-bands for use during a quiet period containing quiet phases. During the quiet period, while the transmitter communicates with the receiver on one sub-band, the receiver simultaneously senses for incumbent devices on another sub-band, as well as vice-versa. Transmission and sensing do not occur simultaneously on the same sub-band and transmission is limited to only one of the sub-bands. Transmission and sensing are performed by both the transmitter and the receiver on every sub-band over the course of the quiet period. The locations of secondary receivers are determined and employed during scheduling such that devices sufficiently separated from each other transmit during different quiet phases and transmit and sense in sub-bands separated by another sub-band.
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Citations
20 Claims
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1. A method of performing sensing for incumbent signals in a secondary communications system, the method comprising:
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determining whether an unused portion of an active communications channel meets an incumbent detection interference requirement at a sensing unit; and if the incumbent detection interference requirement is satisfied on the unused portion of the active communications channel, performing incumbent signal sensing over the unused portion of the active communications channel at the sensing unit. - View Dependent Claims (2, 3)
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4. A method of retaining channel use by a secondary system, the method comprising:
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splitting into multiple sub-bands a channel used during periods of normal communication between a secondary transmitter and a secondary receiver of the secondary system; communicating to the secondary receiver scheduling of a quiet period between adjacent periods of normal communication, the quiet period containing multiple quiet phases; and permitting communication between the secondary transmitter and the secondary receiver on one of the sub-bands simultaneous with sensing for incumbent signals by the secondary transmitter or the secondary receiver on another of the sub-bands during the quiet phases. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A secondary system comprising:
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a secondary transmitter; and secondary receivers configured to communicate with the secondary transmitter over a secondary channel during periods of normal communication, wherein the secondary transmitter is configured to transmit a schedule to the secondary receivers for communications on sub-bands of the secondary channel during a quiet period between adjacent periods of normal communication, the quiet period containing multiple quiet phases, the schedule specifying for each secondary receiver when and on which sub-band communication with the secondary transmitter and sensing for incumbent devices are to occur, during at least one of the quiet phases one of the secondary receivers senses on one of the sub-bands while receiving a transmission from the secondary transmitter. - View Dependent Claims (17, 18, 19, 20)
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Specification