Method and apparatus for cancelling buffer status report in wireless communication system

Abstract

A method and apparatus for cancelling at least one of a buffer status report (BSR), a power headroom report (PHR) and a scheduling request (SR) in a wireless communication system is provided. A user equipment (UE) triggers at least one of a BSR, a PHR and an SR, and cancels the triggered at least one of BSR, PHR and SR if uplink transmission (UL) transmission is not available. Furthermore, the UE prohibits triggering additional at least one of BSR, PHR and SR until the UL transmission is available.

1 . A method for cancelling, by a user equipment (UE), at least one of a buffer status report (BSR), a power headroom report (PHR) and a scheduling request (SR) in a wireless communication system, the method comprising:
 triggering at least one of a BSR, a PHR and an SR; and   cancelling the triggered at least one of BSR, PHR and SR if uplink transmission (UL) transmission is not available.   
     
     
         2 . The method of  claim 1 , further comprising prohibiting triggering additional at least one of BSR, PHR and SR until the UL transmission is available. 
     
     
         3 . The method of  claim 1 , further comprising:
 triggering at least one of BSR, PHR and SR if the UL transmission is available;   transmitting the triggered at least one of BSR, PHR and SR.   
     
     
         4 . The method of  claim 3 , further comprising cancelling all triggered at least one of BSR, PHR and SR. 
     
     
         5 . The method of  claim 1 , wherein the UL transmission is not available when in-device coexistence (IDC) interference occurs. 
     
     
         6 . The method of  claim 1 , wherein if the BSR is triggered, the triggered BSR includes a BSR where UL data becomes available for transmission, and the UL data belongs to a logical channel with higher priority than priorities of logical channels which belong to any logical channel group (LCG) and for which data is already available for transmission, 
     
     
         7 . The method of  claim 1 , wherein if the BSR is triggered, the triggered BSR includes a BSR where UL data becomes available for transmission, or there is no data available for transmission for any of logical channels which belongs to a LCG. 
     
     
         8 . A user equipment (UE) in a wireless communication system, the UE comprising:
 a radio frequency (RF) unit for transmitting or receiving a radio signal; and   a processor coupled to the RF unit, and configured for:   triggering at least one of a buffer status reporting (BSR), a power headroom reporting (PHR) and a scheduling request (SR); and   cancelling the triggered at least one of BSR, PHR and SR if uplink transmission (UL) transmission is not available.   
     
     
         9 . The UE of  claim 8 , wherein the processor is further configured for prohibiting triggering additional at least one of BSR, PHR and SR until the UL transmission is available. 
     
     
         10 . The UE of  claim 8 , wherein the processor is further configured for:
 triggering at least one of BSR, PHR and SR if the UL transmission is available;   transmitting the triggered at least one of BSR, PHR and SR.   
     
     
         11 . The UE of  claim 10 , wherein the processor is further configured for cancelling all triggered at least one of BSR, PHR and SR. 
     
     
         12 . The UE of  claim 8 , wherein the UL transmission is not available when in-device coexistence (IDC) interference occurs. 
     
     
         13 . The UE of  claim 8 , wherein if the BSR is triggered, the triggered BSR includes a BSR where UL data becomes available for transmission, and the UL data belongs to a logical channel with higher priority than priorities of logical channels which belong to any logical channel group (LCG) and for which data is already available for transmission, 
     
     
         14 . The UE of  claim 8 , wherein if the BSR is triggered, the triggered BSR includes a BSR where UL data becomes available for transmission, or there is no data available for transmission for any of logical channels which belongs to a LCG.