Power headroom reporting (PHR) method and user equipment in carrier aggregation communication system

Abstract

The invention discloses a power headroom reporting (PHR) method in a carrier aggregation communication system. The method comprises the following steps that: an eNodeB (eNB) configures PHR triggering carrier groups and PHR carrier groups for user equipment (UE) respectively and configures one downlink path loss change threshold parameter for each PHR triggering carrier group respectively; the UE selects one measuring carrier from each PHR triggering carrier group; and if the measured path loss change of the carrier is more than or equal to the downlink path loss change threshold parameter configured by the eNB for the PHR triggering carrier group where the carrier is positioned, the PHR is triggered by all carriers in the PHR triggering carrier group where the carrier is positioned, and the UE selects one carrier from each PHR carrier group for the PHR. The invention also discloses the UE in the carrier aggregation communication system. Though the power headroom reporting method and the UE, the PHR can be accurately and efficiently performed, and the wireless resources of the system are saved.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a power headroom reporting method and user equipment (UE) in a carrier aggregation communication system. Background technique [0002] In the long-term evolution (LTE) system, the uplink power resource allocation of the base station (eNodeB, eNB) to the user equipment (UE) generally cannot exceed the maximum transmit power of the UE. To ensure this, the UE needs to report the power headroom to the eNB. [0003] In the existing LTE standard of the 3rd Generation Partnership Project (3GPP) Release 8, during the power headroom reporting process, the UE provides the serving eNB with the estimated maximum transmission power of the UE and the transmission power of the current Physical Uplink Shared Channel (PUSCH) difference information between. The radio resource control (RRC) controls the power headroom reporting process by configuring two timers and a downlink path loss ch...

AI Technical Summary

Problems solved by technology

Carrier-level PHR reporting can accurately report the power headroom of each carrier to the eNB, but in the case of a large number of carriers configured by the UE, using carrier-level PHR reporting will result in too frequent reporting, thus consuming too many radio resources

The number of UE-level PHR reports is less, which is beneficial to save radio resources, but it is difficult for eNB to know the UPH of each carrier accurately by using UE-level PHR report, so it will affect the efficiency of eNB scheduling

In short, the two power headroom reporting methods of the existing carrier aggregation communication system have their own advantages and disadvantages, but neither can achieve accurate and efficient power headroom report results

Images