Patent ID: 9125164
Filing Date: 2015-09-01
Classification: H04W

Abstract:
1. A method of providing a power headroom reporting (PHR) in wireless communications system, the method comprising: determining whether a user equipment (UE) has allocated uplink (UL) resources for a new transmission for a current transmission time interval (TTI); determining whether at least one PHR is to be triggered, wherein the PHR is triggered by a configuration or reconfiguration of the PHR functionality by upper layers, which is not used to disable the PHR functionality; determining whether the allocated UL resources can accommodate a PHR medium access control (MAC) control element (CE) as a result of logical channel prioritization; if it is determined that the at least one PHR is to be triggered, the UE has the allocated UL resources for the new transmission for the current TTL, and the allocated UL resources can accommodate the PHR MAC CE as the result of logical channel prioritization, generating and transmitting the PHR MAC control element based on a power headroom value obtained from a physical layer; if it is determined that the allocated UL resources cannot accommodate the PHR MAC CE as the result of logical channel prioritization, determining whether the UE has the allocated UL resources for the new transmission for a next TTI; generating and transmitting the PHR MAC control element based on the power headroom value obtained from the physical layer if it is determined that the UE has the allocated UL resources for the new transmission for the next TTI; and starting a periodic PHR timer after transmitting the PHR MAC control element.