Patent ID: 9544804
Date: 2017-01-10
CPC Classifications: H04W

Claim:
1. A method for transmitting a power headroom report (PHR) from a user equipment (UE), the method comprising: determining, by the UE, that a PHR trigger condition is satisfied for at least one of a plurality of timing advance groups (TAGs) configured for the UE, each of the TAGs including a plurality of serving cells which share a common timing advance value, wherein the PHR trigger condition includes a case where a prohibit PHR-timer has expired and path loss for at least one serving cell has changed more than a predetermined value; and determining, by the UE, whether a time alignment timer (TAT) is running for the at least one TAG for which the PHR trigger condition is satisfied; generating, by the UE, a medium access control protocol data unit (MAC PDU), which includes, when it is determined that the TAT is running, power headroom information for one or more serving cells included in the at least one TAG for which the PHR trigger condition is satisfied; and transmitting, by the UE to a base station, the generated MAC PDU.