Triggering of aperiodic channel state information reference signals with mixed numerology
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsSebastian Faxér, Sorour Falahati, Robert Baldemair
Life of this patent
Estimating the term…
Abstract
Devices, systems, and methods described herein may improve aperiodic CSI-RS handling in mixed numerology environments. An exemplary method includes operations of receiving a downlink control information (DCI) message carried by a Physical Downlink Control Channel (PDCCH) on a second carrier, wherein the second carrier uses a second OFDM numerology, obtaining an aperiodic CSI-RS slot offset from the DCI message, determining a reference slot in the first numerology, determining the slot of the aperiodic CSI-RS based on the reference slot and the aperiodic CSI-RS slot offset, and receiving or transmitting the aperiodic CSI-RS in the determined slot.
Claims21
A method, performed by a wireless device, for receiving an aperiodic channel state information reference signal (CSI-RS) on a first carrier, where the first carrier uses a first orthogonal frequency division multiplexing (OFDM) numerology, the method comprising,
- receiving a downlink control information (DCI) message carried by a Physical Downlink Control Channel (PDCCH) on a second carrier, wherein the second carrier uses a second OFDM numerology;
- obtaining an aperiodic CSI-RS slot offset from the DCI message;
- determining a reference slot in the first numerology;
- determining the slot of the aperiodic CSI-RS based on the reference slot and the aperiodic CSI-RS slot offset;
- and
- receiving or transmitting the aperiodic CSI-RS in the determined slot.
A user equipment (UE) for receiving an aperiodic channel state information reference signal (CSI-RS) on a first carrier, where the first carrier uses a first orthogonal frequency division multiplexing (OFDM) numerology, the UE comprising:
- an antenna configured to send and receive wireless signals;
- radio front-end circuitry connected to the antenna and to processing circuitry, and configured to condition signals communicated between the antenna and the processing circuitry;
- the processing circuitry being configured to perform operations comprising:
- receiving a downlink control information (DCI) message carried by a Physical Downlink Control Channel (PDCCH) on a second carrier, wherein the second carrier uses a second OFDM numerology;
- obtaining an aperiodic CSI-RS slot offset from the DCI message;
- determining, on the first carrier, a reference slot in the first numerology;
- determining the slot of the aperiodic CSI-RS based on the reference slot and the aperiodic CSI-RS slot offset;
- and
- receiving the aperiodic CSI-RS in the determined slot of the aperiodic CSI-RS or transmitting an associated CSI-RS report in the determined slot;
- and
- a battery connected to the processing circuitry and configured to supply power to the UE.
A communication system comprising:
- processing circuitry configured to provide user data;
- and
- a communication interface configured to forward the user data to a cellular network for transmission to a user equipment (UE),
- wherein the cellular network comprises at least one base station having a radio interface and processing circuitry, the processing circuitry being configured to transmit channel state information reference signal (CSI-RS) information aperiodically on a first carrier according to a first numerology and on a second carrier according to a second numerology.
A method, performed by a base station, for transmitting an aperiodic channel state information reference signal (CSI-RS) on a first carrier, the method comprising,
- transmitting a downlink control information (DCI) message carried by a Physical Downlink Control Channel (PDCCH) on a second carrier, wherein the DCI message includes an aperiodic CSI-RS slot offset;
- transmitting the aperiodic CSI-RS in the determined slot of the aperiodic CSI-RS according to the aperiodic CSI-RS slot offset.
Dependencies are inferred from the claim text.