INTER-ENB OVER-THE-AIR CALIBRATION FOR RECIPROCITY-BASED COORDINATED MULTIPOINT COMMUNICATIONS
First Claim
1. A method of wireless communication, comprising:
- transmitting, by a central unit, a downlink (DL) calibration reference signal (RS) and a calibration request;
receiving, by the central unit in response to the calibration request, a first uplink (UL) calibration RS and a first DL channel estimate associated with a first transmission point (TP) and a first wireless communication device; and
transmitting, by the central unit, a DL coordinated multipoint (CoMP) joint transmission signal according to an uplink-downlink (UL-DL) reciprocity calibration, wherein the UL-DL reciprocity calibration is based on at least a first UL channel estimate based on the first UL calibration RS, the first DL channel estimate, a second UL channel estimate associated with a second TP and the first wireless communication device, and a second DL channel estimate associated with the second TP and the first wireless communication device.
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Accused Products
Abstract
Wireless communications systems and methods related to over-the-air uplink-downlink (UL-DL) reciprocity calibration. A central unit transmits downlink (DL) calibration reference signal (RS) and a calibration request. The central unit receives, in response to the calibration request, a first uplink (UL) calibration RS and a first DL channel estimate associated with a first transmission point (TP) and a first wireless communication device. The central unit transmits a DL coordinated multipoint (CoMP) joint transmission signal according to an uplink-downlink (UL-DL) reciprocity calibration. The UL-DL reciprocity calibration is based on at least a first UL channel estimate based on the first UL calibration RS, the first DL channel estimate, a second UL channel estimate associated with a second TP and the first wireless communication device, and a second DL channel estimate associated with the second TP and the first wireless communication device.
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Citations
30 Claims
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1. A method of wireless communication, comprising:
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transmitting, by a central unit, a downlink (DL) calibration reference signal (RS) and a calibration request; receiving, by the central unit in response to the calibration request, a first uplink (UL) calibration RS and a first DL channel estimate associated with a first transmission point (TP) and a first wireless communication device; and transmitting, by the central unit, a DL coordinated multipoint (CoMP) joint transmission signal according to an uplink-downlink (UL-DL) reciprocity calibration, wherein the UL-DL reciprocity calibration is based on at least a first UL channel estimate based on the first UL calibration RS, the first DL channel estimate, a second UL channel estimate associated with a second TP and the first wireless communication device, and a second DL channel estimate associated with the second TP and the first wireless communication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of wireless communication, comprising:
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receiving, by a user equipment (UE) from a first transmission point (TP), a first downlink (DL) calibration reference signal (RS) and a calibration request; determining, by the UE, a first DL channel estimate based on the first DL calibration RS; transmitting, by the UE to the first TP in response to the calibration request, a first uplink (UL) calibration RS and the first DL channel estimate to facilitate an uplink-downlink (UL-DL) reciprocity calibration; and receiving, by the UE, a DL coordinated multipoint (CoMP) joint transmission signal transmitted according to the UL-DL reciprocity calibration. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a receiver configured to receive a first uplink (UL) calibration reference signal (RS) and a first DL channel estimate associated with a first transmission point (TP) and a first wireless communication device; and a transmitter configured to; transmit a downlink (DL) calibration reference signal (RS) and a calibration request, wherein the first UL calibration RS and the first DL channel estimate are received in response to the calibration request; and transmit a DL coordinated multipoint (CoMP) joint transmission signal according to an uplink-downlink (UL-DL) reciprocity calibration, wherein the UL-DL reciprocity calibration is based on at least a first UL channel estimate based on the first UL calibration RS, the first DL channel estimate, a second UL channel estimate associated with a second TP and the first wireless communication device, and a second DL channel estimate associated with the second TP and the first wireless communication device. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus comprising:
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a receiver configured to; receive, from a first transmission point (TP), a first downlink (DL) calibration reference signal (RS) and a calibration request; and receive a DL coordinated multipoint (CoMP) joint transmission signal transmitted according to an uplink-downlink (UL-DL) reciprocity calibration; a processor configured to determine a first DL channel estimate based on the first DL calibration RS; and a transmitter configured to transmit, to the first TP in response to the calibration request, a first uplink (UL) calibration RS and the first DL channel estimate to facilitate the UL-DL reciprocity calibration. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification