Channel Usage Indication and Synchronization for LTE Operation in Unlicensed Bands

Patent metadata

Field	Value
Publication number	US-2019246366-A1
Application number	US-201916387040-A
Country	US
Kind code	A1
Filing date	Apr 17, 2019
Priority date	Sep 24, 2014
Publication date	Aug 8, 2019
Grant date	—

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.

First claim

1 - 34 . (canceled)

35 . A wireless transmit/receive unit (WTRU) comprising:
a processor configured to: receive downlink control information (DCI) for a physical downlink shared channel (PDSCH) transmission, the DCI indicating a rate matching configuration for the PDSCH transmission; determine, based on 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 allocated for the PDSCH transmission; and receive the PDSCH transmission comprising a transport block with the determined TBS in accordance with the rate matching configuration indicated in the DCI.

36 . The WTRU of claim 35 , wherein the rate matching configuration indicates one or more resource elements that are skipped during de-mapping.

37 . The WTRU of claim 35 , wherein the processor is further configured to receive a synchronization signal, and wherein the synchronization signal comprises at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), or a demodulation reference signal (DMRS).

38 . The WTRU of claim 35 , wherein the rate matching configuration indicates one or more time and/or frequency resources to be rate matched around when receiving the PDSCH transmission.

39 . The WTRU of claim 35 , wherein the processor is further configured to perform frequency or timing estimation based on a synchronization signal transmission.

40 . The WTRU of claim 35 , wherein the rate matching configuration is indicated by a rate matching indicator that identifies the one or more resource elements that are rate matched around when receiving the PDSCH transmission.

41 . The WTRU of claim 35 , wherein the rate matching configuration is a first rate matching configuration, and wherein the processor is further configured to receive a semi-static configuration corresponding to a plurality of rate matching configurations and the DCI indicates to apply the first rate matching configuration of the plurality of rate matching configurations for the PDSCH transmission.

42 . The WTRU of claim 35 , wherein the processor is configured to determine the one or more resources that are rate matched around based on the rate matching configuration, and wherein PDSCH data for the WTRU is not mapped to the one or more resource that are rate matched around.

43 . A method comprising:
receiving downlink control information (DCI) for a physical downlink shared channel (PDSCH) transmission, the DCI indicating a rate matching configuration for the PDSCH transmission; determining, based on 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 allocated for the PDSCH transmission; and receiving the PDSCH transmission comprising a transport block with the determined TBS in accordance with the rate matching configuration indicated in the DCI.

44 . A wireless transmit/receive unit (WTRU) comprising:
a processor configured to: receive a power offset indication that indicates a power offset between a synchronization signal transmission and a reference signal transmission; determine, based on the received power offset indication, a reference signal transmission power level; and receive the reference signal transmission.

45 . The WTRU of claim 44 , wherein the power offset indication is received via higher layer signaling.

46 . The WTRU of claim 44 , wherein the power offset indication is received in a radio resource control (RRC) message.

47 . The WTRU of claim 44 , wherein the reference signal transmission comprises a channel state information reference signal (CSI-RS).

48 . The WTRU of claim 44 , wherein the processor is further configured to determine a synchronization signal transmission power level.

49 . The WTRU of claim 48 , wherein the processor is further configured to measure the synchronization signal transmission to determine the synchronization signal transmission power level.

50 . The WTRU of claim 48 , wherein the reference signal transmission power level is determined using the power offset and the synchronization signal transmission power level.

51 . The WTRU of claim 44 , wherein the processor is further configured to determine the power offset based on the power offset indication.

52 . The WTRU of claim 44 , wherein the processor is configured to perform frequency or timing estimation based on the synchronization signal transmission.

53 . The WTRU of claim 44 , wherein the synchronization signal transmission comprises a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

Assignees

• Interdigitial Patent Holdings Inc
• Interdigital Patent Holdings Inc

Inventors

• Sadeghi Pouriya
• Stern-Berkowitz Janet A
• Lee Moon-Il
• Tooher J Patrick
• Rudolf Marian

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title