Air-to-ground co-channel interference avoidance system
First Claim
1. An air-to-ground communication system comprising:
- a transceiver unit disposed within a ground station included in the air-to-ground communication system, the transceiver unit utilized by the air-to-ground communication system to communicate on a plurality of carriers, each carrier of the plurality of carriers being a different, respective communication channel corresponding to a different, respective frequency of a frequency spectrum utilized by the plurality of carriers, the air-to-ground communication system being a secondary user of the frequency spectrum utilized by the plurality of carriers, the secondary user utilizing the frequency spectrum to provide air-to-ground communications, and the secondary user being subject to one or more restrictions on at least one of power or spatial configuration to thereby allow co-presence of the primary user and the secondary user on the frequency spectrum, wherein the plurality of carriers is configured by the secondary user via grants communicated over a control channel; and
a computer processor coupled to the transceiver unit and configured to;
cause the transceiver unit to communicate, over the control channel, a first transmission grant indicating two or more of the plurality of carriers allocated to the transceiver unit to utilize for sending transmissions;
cause the transceiver unit to transmit, in accordance with the one or more restrictions and with the first transmission grant communicated by the transceiver unit, data on the indicated two or more of the plurality of carriers;
configure the transceiver unit to detect a transmission failure indicating that the transmitted data on a particular carrier of the two or more of the plurality of carriers has not been received by a receiving unit; and
in response to detecting the transmission failure;
cause the transceiver unit to communicate, over the control channel, a retransmission grant excluding an indication of the particular carrier and including an indication of the other carriers of the two or more of the plurality of carriers indicated by the first transmission grant, andcause the transceiver unit to retransmit, to the receiving unit, in accordance with the one or more restrictions and with the retransmission grant communicated by the transceiver unit, the data on the two or more of the plurality of carriers.
9 Assignments
0 Petitions
Accused Products
Abstract
Techniques to reduce scheduling grants to minimize or eliminate the use of control channels, at the expense of flexibility, allow protection of the system from unnecessary retransmissions in case of interference from the primary system. Use of a single grant to allocate a set of resources across all carriers, or communication channels simplifies the system at the cost of retransmission of a grant for all carriers in the case if interference corrupts the transmission of a subset of the carriers. Thus, complementing a single grant embodiment with detection of the affected frequency carriers or victim carriers and remove such carriers from the carrier aggregation configuration allows more efficient use of the allocated spectrum.
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Citations
22 Claims
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1. An air-to-ground communication system comprising:
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a transceiver unit disposed within a ground station included in the air-to-ground communication system, the transceiver unit utilized by the air-to-ground communication system to communicate on a plurality of carriers, each carrier of the plurality of carriers being a different, respective communication channel corresponding to a different, respective frequency of a frequency spectrum utilized by the plurality of carriers, the air-to-ground communication system being a secondary user of the frequency spectrum utilized by the plurality of carriers, the secondary user utilizing the frequency spectrum to provide air-to-ground communications, and the secondary user being subject to one or more restrictions on at least one of power or spatial configuration to thereby allow co-presence of the primary user and the secondary user on the frequency spectrum, wherein the plurality of carriers is configured by the secondary user via grants communicated over a control channel; and a computer processor coupled to the transceiver unit and configured to; cause the transceiver unit to communicate, over the control channel, a first transmission grant indicating two or more of the plurality of carriers allocated to the transceiver unit to utilize for sending transmissions; cause the transceiver unit to transmit, in accordance with the one or more restrictions and with the first transmission grant communicated by the transceiver unit, data on the indicated two or more of the plurality of carriers; configure the transceiver unit to detect a transmission failure indicating that the transmitted data on a particular carrier of the two or more of the plurality of carriers has not been received by a receiving unit; and in response to detecting the transmission failure; cause the transceiver unit to communicate, over the control channel, a retransmission grant excluding an indication of the particular carrier and including an indication of the other carriers of the two or more of the plurality of carriers indicated by the first transmission grant, and cause the transceiver unit to retransmit, to the receiving unit, in accordance with the one or more restrictions and with the retransmission grant communicated by the transceiver unit, the data on the two or more of the plurality of carriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 21)
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10. A method, performed by a computer processor, comprising:
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configuring a transceiver unit to be utilized by an air-to-ground communication system to communicate on a plurality of carriers, the transceiver unit disposed within a ground station included in the air-to-ground communications system, each carrier of the plurality of carriers being a different, respective communication channel corresponding to a different, respective frequency of a frequency spectrum utilized by the plurality of carriers, the air-to-ground communication system being a secondary user of the frequency spectrum utilized by the plurality of carriers, the secondary user utilizing the frequency spectrum to provide air-to-ground communications, and the secondary user being subject to one or more restrictions on at least one of power or spatial configuration to thereby allow co-presence of the primary user and the secondary user on the frequency spectrum, wherein the plurality of carriers is configured by the secondary user using grants communicated over a control channel, and wherein at least one of the communication services comprises a guard time where the transceiver unit halts transmission; causing the transceiver unit to communicate, over the control channel, a first transmission grant indicating two or more of the plurality of carriers allocated to the transceiver unit to utilize for sending transmissions; causing the transceiver unit to transmit, in accordance with the one or more restrictions and with the first transmission grant communicated by the transceiver unit, data on the indicated two or more of the plurality of carriers; configuring the transceiver unit to detect a transmission failure indicating that the transmitted data on a particular carrier of the two or more of the plurality of carriers has not been received by a receiving unit; and in response to detecting the transmission failure; causing the transceiver unit to communicate, over the control channel, a retransmission grant excluding an indication of the particular carrier and including an indication of the other carriers of the two or more of the plurality of carriers indicated by the first transmission grant, and causing the transceiver unit to retransmit, to the receiving unit, in accordance with the one or more restrictions and with the retransmission grant communicated by the transceiver unit, the data on the two or more of the plurality of carriers. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22)
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Specification