US 10,313,990 B2 · Channel usage indication and synchronization for LTE operation in unlicensed bands

Abstract

Systems, methods, and instrumentalities are disclosed for LTE operation in an unlicensed spectrum, LTE-U. A wireless transmit/receive unit, WTRU, may establish a connection with a first cell on a licensed frequency band. The WTRU may receive a first downlink transmission from a second cell operating on an unlicensed frequency band. The WTRU may determine that a synchronization signal transmission from a third cell operating on the unlicensed frequency band is transmitted using one or more resource elements. The WTRU may perform frequency and/or timing estimation based on the synchronization signal transmission. The WTRU may perform rate matching around the one or more resource elements that correspond to the synchronization signal transmission. The WTRU may perform rate matching around the one or more resource elements by de-mapping symbols of the downlink transmission.

Claims18

Dependent claims

A method comprising:

receiving a downlink grant, the downlink grant comprising downlink control information (DCI) for a physical downlink shared channel (PDSCH) transmission, the DCI comprising an indication that indicates one or more resource elements to be rate matched around when receiving the PDSCH transmission;
determining, based on at least the indication comprised in the DCI, a total number of resource elements used for the PDSCH transmission;
determining a transport block size (TBS) for the PDSCH transmission based on the total number of resource elements used for the PDSCH transmission;
and
receiving the PDSCH transmission comprising a transport block with the determined TBS, wherein receiving the PDSCH transmission comprises performing rate matching around the one or more resource elements that the indication in the DCI indicated to be rate matched around.

2 more elements

A wireless transmit/receive unit (WTRU) comprising:

a processor configured to:
receive a downlink grant, the downlink grant comprising downlink control information (DCI) for a physical downlink shared channel (PDSCH) transmission, the DCI comprising an indication that indicates one or more resource elements to be rate matched around when the PDSCH transmission is received;
determine, based on at least the indication comprised in the DCI, a total number of resource elements used for the PDSCH transmission;
determine a transport block size (TBS) for the PDSCH transmission based on the total number of resource elements used for the PDSCH transmission;
and
receive the PDSCH transmission comprising a transport block with the determined TBS, wherein being configured to receive the PDSCH transmission comprises being configured to perform rate matching around the one or more resource elements that the indication in the DCI indicated to be rate matched around.

3 more elements

Dependencies are inferred from the claim text.

Channel usage indication and synchronization for LTE operation in unlicensed bands

Life of this patent

Channel usage indication and synchronization for LTE operation in unlicensed bands

Life of this patent

Abstract

Claims18