Apparatus and method for downlink scheduling in a SDMA-enabled OFDMA wireless network
First Claim
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1. A base station capable of communicating with a plurality of subscriber stations in a wireless network, the base station comprising:
- a transceiver capable of transmitting downlink orthogonal frequency division multiple access (OFDMA) signals to the plurality of subscriber stations;
an antenna array capable of transmitting the downlink OFDMA signals to the plurality of subscriber stations using spatially directed beams; and
a scheduling controller capable of scheduling downlink transmissions to the plurality of subscriber stations using spatially directed transmit beams, wherein the scheduling controller schedules a first one of the plurality of subscriber stations to receive in a first time-frequency slot based on a first null space of a matrix associated with at least one subscriber station previously scheduled to receive in the first time-frequency slot.
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Abstract
A scheduler for scheduling downlink transmissions of orthogonal frequency division multiple access (OFDMA) signals using spatially directed beams to a plurality of subscriber stations in a wireless network. The scheduler schedules the downlink transmissions as a function of frequency, time, and space. The scheduler further schedules downlink transmissions to a first subscriber station based on a first null space associated with at least one subscriber station previously scheduled to receive.
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Citations
20 Claims
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1. A base station capable of communicating with a plurality of subscriber stations in a wireless network, the base station comprising:
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a transceiver capable of transmitting downlink orthogonal frequency division multiple access (OFDMA) signals to the plurality of subscriber stations; an antenna array capable of transmitting the downlink OFDMA signals to the plurality of subscriber stations using spatially directed beams; and a scheduling controller capable of scheduling downlink transmissions to the plurality of subscriber stations using spatially directed transmit beams, wherein the scheduling controller schedules a first one of the plurality of subscriber stations to receive in a first time-frequency slot based on a first null space of a matrix associated with at least one subscriber station previously scheduled to receive in the first time-frequency slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless network comprising a plurality of base stations capable of communicating with subscriber stations, each one of the plurality of base stations comprising:
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a transceiver capable of transmitting downlink orthogonal frequency division multiple access (OFDMA) signals to a plurality of the subscriber stations; an antenna array capable of transmitting the downlink OFDMA signals to the plurality of subscriber stations using spatially directed beams; and a scheduling controller capable of scheduling downlink transmissions to the plurality of subscriber stations using spatially directed transmit beams, wherein the scheduling controller schedules a first one of the plurality of subscriber stations to receive in a first time-frequency slot based on a first null space of a matrix associated with at least one subscriber station previously scheduled to receive in the first time-frequency slot. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of communicating with a plurality of subscriber stations in a wireless network, the method comprising:
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transmitting downlink orthogonal frequency division multiple access (OFDMA) signals to at least one subscriber station in a first time-frequency slot using spatially directed beams; determining a first null space of a matrix associated with the at least one subscriber station; and scheduling a first subscriber station to receive in the first time-frequency slot based on the first null space. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification