Downlink transmission power control method, device and system

Abstract

The invention provides a downlink transmission power control method, a device and a system. The downlink transmission power control method comprises: UE obtains the corresponding first signal quality according to TPC bit on a low power node downlink channel, wherein the UE is positioned in the switching area of a low power node and a high frequency node; the UE compares first signal quality with the target value of the first signal quality, and TPC1 order controlled by the first transmission power is obtained according to the comparison result; the target value of the first signal quality is obtained according to the TPC error rate of the TPC bit; and the UE sends the TPC1 order to the low power node in order to make the low power node adjust the downlink transmission power of the TPC bit. According to the embodiment of the invention, the transmission performance of the downlink channel of the low power node can be improved by comparing the first signal quality corresponding to the low power node and the first signal quality target value to receive a TPC1 order, and using the TPC1 order to correctly control the TPC bit emission power of the low power node so as to improve the transmission performance of the downlink channel of the low power node.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a downlink transmission power control method, device and system. Background technique [0002] Power control is one of the means for a Universal Mobile Telecommunications System (UMTS for short) to combat fading of wireless channel transmission and improve system capacity. [0003] In a heterogeneous network (heterogeneous network, hereinafter referred to as Hetnet), user equipment (User Equipment, hereinafter referred to as UE) obtains macro base station The signal to interference ratio (Signal to interference ratio, hereinafter referred to as SIR) of the downlink channel of the LPN, by comparing the SIR with the target value of the signal to interference ratio, a transmission power control (Transmission Power Control, hereinafter referred to as TPC) command is generated for the macro base station and The transmit power of the LPN is uniformly adjusted. ...

AI Technical Summary

Problems solved by technology

[0004] However, there is an unbalanced uplink and downlink area in Hetnet. When the UE is in the unbalanced uplink and downlink area, and the soft handover area between the macro base station and the LPN is close to the macro base station, the UE receives the downlink signal of the macro base station. The quality is better than that of the LPN downlink signal. The TPC command generated by the UE mainly depends on the downlink signal of the macro base station. As a result, the TPC command cannot correctly control the transmit power of the LPN, thereby affecting the transmission performance of the LPN downlink channel.

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