Method and apparatus for handling transmission in a wireless communication system

Abstract

A method and apparatus for handling transmission in a wireless communication system. In one embodiment, the method includes initiating a RA procedure, by a UE, in a serving cell. The method also includes deciding whether to transmit a RA Preamble, by the UE, in the serving cell at a specific timing during the RA procedure based on at least one information that includes beam(s) (or beam group(s)) of the serving cell detected by the UE.

1 . A method for a User Equipment (UE), comprising:
 initiating a Random Access (RA) procedure in a serving cell;   deciding whether to transmit a RA Preamble in the serving cell at a specific timing during the RA procedure based on at least one information that includes beam(s) (or beam group(s)) of the serving cell detected by the UE.   
     
     
         2 . The method of  claim 1 , wherein the at least one information further includes a relation between a Preamble transmission opportunity in the serving cell and beam(s) (or beam group(s)) of the serving cell. 
     
     
         3 . The method of  claim 1 , wherein the beam(s) (or beam group(s)) detected by the UE means that radio condition (e.g., RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality)) of the beam(s) (or beam group(s)) is higher than a threshold. 
     
     
         4 . The method of  claim 1 , wherein detecting a beam (or a beam group) means that power of a DL (Downlink) reference signal associated with the beam (or the beam group), received by the UE, is larger than a threshold. 
     
     
         5 . The method of  claim 1 , further comprising:
 the UE uses a transmission timing or a transmission resource of a DL (Downlink) reference signal associated with a beam (or a beam group) to identify or detect the beam (or the beam group).   
     
     
         6 . A method for a User Equipment (UE), comprising:
 receiving information associated with a cell controlled by a base station, wherein the information is related to when a beam (or a beam group) of the cell will be generated; and   determining whether to perform a reception or a transmission in the cell based on at least the information.   
     
     
         7 . The method of  claim 6 , wherein the reception is to receive a Random Access Response or to monitor a DL (Downlink) control signaling. 
     
     
         8 . The method of  claim 6 , further comprising:
 determining whether to perform the reception or the transmission in the cell based further on a configuration associated with the reception or a configuration associated with the transmission.   
     
     
         9 . The method of  claim 6 , wherein the transmission is to transmit a Random Access Preamble, a UL (Uplink) reference signal, a Scheduling Request, or a report for DL (Downlink) channel condition. 
     
     
         10 . The method of  claim 6 , wherein the information includes when the beam (or the beam group) will be generated during a time period. 
     
     
         11 . The method of  claim 6 , wherein the information is provided in the beam (or the beam group). 
     
     
         12 . The method of  claim 6 , wherein the information is provided by a DL control signaling, a MAC (Medium Access Control) control element, a PDCCH (Physical Downlink Control Channel) signaling, or a physical layer control signaling. 
     
     
         13 . A method of a User Equipment (UE), comprising:
 the UE receives a downlink signal corresponding to multiple transmission occasions,   wherein the downlink signal includes information instructing the UE which of the multiple transmission occasions the UE should perform a transmission and which of the multiple transmission occasions the UE should not perform the transmission.   
     
     
         14 . The method of  claim 13 , wherein the transmission is a reference signal transmission for beam identification or beam tracking. 
     
     
         15 . The method of  claim 14 , wherein the reference signal is a SRS (Sounding Reference Signal), a demodulation reference signal, or a preamble.