Coordinated multipoint systems
First Claim
1. A central processor, comprising:
- a fronthaul network transceiver communicatively coupled to a plurality of geographically distributed base transceiver stations via a fronthaul network, the base transceiver stations configured to employ overlapping coverage areas in a Radio Access Network (RAN) to serve a plurality of User Equipments (UEs); and
a cooperative Multiple-Input, Multiple-Output (MIMO) processor configured for;
selecting a plurality of antennas residing on multiple ones of the plurality of base transceiver stations to serve each of the plurality of UEs, wherein each of the plurality of UEs is served by a different plurality of antennas;
computing baseband pre-coding weights for signals to be transmitted by the plurality of antennas, the baseband pre-coding weights computed from RAN channel state information between the plurality of antennas and the plurality of UEs; and
coordinating transmissions of pre-coded signals from the plurality of antennas to exploit multipath in the RAN to coherently combine at each of the plurality of UEs.
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Accused Products
Abstract
In a coordinated multipoint system, geographically distributed base transceiver stations employ overlapping coverage areas in a Radio Access Network (RAN) to serve multiple User Equipments (UEs). A fronthaul network communicatively couples the base transceiver stations to a central processor. The central processor comprises a cooperative multiple-input, multiple-output (MIMO) processor configured to select multiple antennas residing on multiple ones of the base transceiver stations to serve each of the UEs; compute baseband pre-coding weights for signals to be transmitted by the antennas, the baseband pre-coding weights computed from RAN channel state information between the antennas and the UEs; and coordinate transmissions of pre-coded signals from the antennas to exploit multipath in the RAN to coherently combine at each of the UEs. Since each UE can be provided with its own localized coherence zone, this enables the UEs to concurrently employ the same frequency spectrum.
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Citations
25 Claims
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1. A central processor, comprising:
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a fronthaul network transceiver communicatively coupled to a plurality of geographically distributed base transceiver stations via a fronthaul network, the base transceiver stations configured to employ overlapping coverage areas in a Radio Access Network (RAN) to serve a plurality of User Equipments (UEs); and a cooperative Multiple-Input, Multiple-Output (MIMO) processor configured for; selecting a plurality of antennas residing on multiple ones of the plurality of base transceiver stations to serve each of the plurality of UEs, wherein each of the plurality of UEs is served by a different plurality of antennas; computing baseband pre-coding weights for signals to be transmitted by the plurality of antennas, the baseband pre-coding weights computed from RAN channel state information between the plurality of antennas and the plurality of UEs; and coordinating transmissions of pre-coded signals from the plurality of antennas to exploit multipath in the RAN to coherently combine at each of the plurality of UEs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A base transceiver station, comprising:
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a radio access network (RAN) transceiver comprising at least one antenna configured to transmit radio-frequency (RF) signals into the RAN and receive RF signals from the RAN;
at least one fronthaul interface that communicatively couples the base transceiver station to a fronthaul network;a channel state processing system configured to communicate RAN channel state information from the base transceiver station to a central processor via the fronthaul network; and a cooperative multiple-input, multiple-output (MIMO) processor configured to receive pre-coded RAN signals from the central processor via the fronthaul network, and configured by the central processor in coordination with at least one other base transceiver station to concurrently transmit the pre-coded RAN signals for exploiting multipath in the RAN to coherently combine with transmissions from the at least one other base transceiver station at each of a plurality of User Equipments (UEs), wherein each of the plurality of UEs is served by a different plurality of antennas residing on the base transceiver station and the at least one other base transceiver station. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system, comprising:
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a plurality of geographically distributed base transceiver stations configured to employ overlapping coverage areas in a Radio Access Network (RAN) to serve a plurality of User Equipments (UEs); a fronthaul network communicatively coupling the plurality of geographically distributed base transceiver stations to a central processor; and the central processor comprising a cooperative multiple-input, multiple-output (MIMO) processor configured for; selecting a plurality of antennas residing on multiple ones of the plurality of base transceiver stations to serve each of the plurality of UEs, wherein each of the plurality of UEs is served by a different plurality of antennas; computing baseband pre-coding weights for signals to be transmitted by the plurality of antennas, the baseband pre-coding weights computed from RAN channel state information between the plurality of antennas and the plurality of UEs; and coordinating transmissions of pre-coded signals from the plurality of antennas to exploit multipath in the RAN to coherently combine at each of the plurality of UEs. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification