Method and apparatus for uplink transmissions in frame-based equipment nr unlicensed

Abstract

Methods and apparatuses of a BSs and UEs in a wireless communication system are provided. A method of operating the UE comprises: receiving, from a BS over a shared spectrum channel, a first DCI including a COT of the BS; determining a first portion of the COT for a downlink transmission from the BS and a second portion of the COT for an uplink transmission to the BS, wherein the COT includes a gap between the first and second portions of the COT; performing a channel access procedure based on a duration of the gap; receiving the downlink transmission in the first portion of the COT; and transmitting the uplink transmission in the second portion of the COT based on a sensing status of the shared spectrum channel that is sensed as an idle state during the channel access procedure in the duration of the gap.

What is claimed is: 
     
         1 . A method performed by a user equipment (UE) operating in a shared spectrum channel, the method comprising:
 receiving, from a base station, a downlink (DL) transmission in a channel occupancy time (COT);   identifying a time gap between the DL transmission and an uplink (UL) transmission;   identifying whether to perform a channel sensing before the UL transmission according to a value of the time gap; and   transmitting, to the base station, the UL transmission within the COT,   wherein a maximum of the COT Ty is identified as Ty=0.95Tx, where Tx is a duration configured by a higher layer parameter.   
     
     
         2 . The method of  claim 1 , wherein:
 a channel occupancy associated with the COT is initiated by the base station, and   the UL transmission of the UE is transmitted based on a detection of the DL transmission within the COT.   
     
     
         3 . The method of  claim 1 , wherein the UL transmission is transmitted within the COT without the channel sensing in case that the value of the time gap is at most 16 μs. 
     
     
         4 . The method of  claim 1 , wherein the UL transmission is transmitted within the COT after the channel sensing in case that the value of the time gap is more than 16 μs and the channel is identified to be idle for at least a sensing slot duration within a 25 μs interval before the UL transmission. 
     
     
         5 . The method of  claim 4 , wherein the sensing slot duration equals 9 μs. 
     
     
         6 . The method of  claim 1 , wherein physical random access channel (PRACH) occasion is identified to be valid based on whether the PRACH occasion overlaps with a time period before a start of the COT. 
     
     
         7 . The method of  claim 6 , wherein the time period is associated with a duration of the COT. 
     
     
         8 . A user equipment (UE), comprising:
 a transceiver configured to receive, from a base station, a downlink (DL) transmission in a channel occupancy time (COT); and   a processor operably coupled to the transceiver, the processor configured to:
 identify a time gap between the DL transmission and an uplink (UL) transmission; and 
 identify whether to perform a channel sensing on a channel before the UL transmission according to a value of the time gap, 
   wherein the transceiver is configured to transmit, to the base station, the UL transmission within the COT, and   wherein a maximum of the COT Ty is identified as Ty=0.95Tx, where Tx is a duration configured by a higher layer parameter.   
     
     
         9 . The UE of  claim 8 , wherein:
 a channel occupancy associated with the COT is initiated by the base station, and   the UL transmission of the UE is transmitted based on a detection of the DL transmission within the COT.   
     
     
         10 . The UE of  claim 8 , wherein the UL transmission is transmitted within the COT without the channel sensing in case that the value of the time gap is at most 16 μs. 
     
     
         11 . The UE of  claim 8 , wherein the UL transmission is transmitted within the COT after the channel sensing in case that the value of the time gap is more than 16 μs and the channel is identified to be idle for at least a sensing slot duration within a 25 μs interval before the UL transmission. 
     
     
         12 . The UE of  claim 11 , wherein the sensing slot duration equals 9 μs. 
     
     
         13 . The UE of  claim 8 , wherein physical random access channel (PRACH) occasion is identified to be valid based on whether the PRACH occasion overlaps with a time period before a start of the COT. 
     
     
         14 . The UE of  claim 13 , wherein the time period is associated with a duration of the COT. 
     
     
         15 . A base station, comprising:
 a transceiver configured to receive, from a user equipment (UE), an uplink (UL) transmission in a channel occupancy time (COT); and   a processor operably coupled to the transceiver, the processor configured to:
 identify a time gap between the UL transmission and a downlink (DL) transmission; and 
 identify whether to perform a channel sensing on a channel before the DL transmission according to a value of the time gap, 
   wherein the transceiver is configured to transmit, to the UE, the DL transmission within the COT, and   wherein a maximum of the COT Ty is identified as Ty=0.95Tx, where Tx is a duration configured by a higher layer parameter.   
     
     
         16 . The base station of  claim 15 , wherein:
 a channel occupancy associated with the COT is initiated by the base station, and   the DL transmission of the base station is transmitted based on a detection of the UL transmission within the COT.   
     
     
         17 . The base station of  claim 15 , wherein the DL transmission is transmitted within the COT without the channel sensing in case that the value of the time gap is at most 16 μs. 
     
     
         18 . The base station of  claim 15 , wherein the DL transmission is transmitted within the COT after the channel sensing in case that the value of the time gap is more than 16 μs and the channel is identified to be idle for at least a sensing slot duration. 
     
     
         19 . The base station of  claim 18 , wherein the sensing slot duration equals 9 μs. 
     
     
         20 . The base station of  claim 15 , wherein physical random access channel (PRACH) occasion is identified to be valid based on whether the PRACH occasion overlaps with a time period before a start of the COT.