Uplink power control device and method

Abstract

The invention discloses an upstream power control device and a method, relating to the power control technology of E-DCH channels in an HSPA+ system. The method of the invention is as follows: firstly, a terminal reads TPCs from a base station within a plurality of recent time slots, current transmission power of upstream channels and a modulation type of the E-DPDCH channel in the next TTI; secondly, a power control method is selected according to the modulation type of an E-DPDCH channel in the next TTI; thirdly, transmission power of an upstream channel applied in the next TTI is calculated according to the TPCS received within the plurality of recent time slots, the current transmission power and maximum transmission power of the upstream channels, minimum transmission power requirement, power control adjustment steplength and beta factor opposite to a DPCCH channel; fourthly, transmission power of all the upstream channels or a part of the upstream channels in TTIs of the whole E-DPDCH channel is kept to be constant. By adoption of the device and the method, crosstalk between I-path signals and Q-path signals is effectively reduced.

Description

technical field [0001] The present invention relates to a power control technology in a Wideband Code Division Multiple Access (WCDMA) mobile communication system, in particular to an enhanced special Channel (Enhanced Dedicated CHannel, hereinafter referred to as E-DCH) power control technology. Background technique [0002] According to the 3rd Generation Partnership Project (3 rd Generation Partnership Project, hereinafter referred to as 3GPP) RP-060844 ("Proposed WID for Higher Order Modulation in HSUPA") proposal, high-speed packet access evolution HSPA+ will add 16-order quadrature amplitude modulation (hereinafter referred to as 16QAM) on the E-DCH data channel ) This new high-order modulation method. [0003] Such as figure 1 As shown, according to 3GPP's R1-070590 ("DRAFT Introduction of 16QAMfor HSUPA") proposal, 16QAM will be 4-level pulse amplitude modulation (4Pulse-Amplitude Modulation, hereinafter referred to as 4PAM) in phase (that is, I channel) and quad...

AI Technical Summary

Problems solved by technology

[0009] On the contrary, if when E-DPDCH transmits 4PAM (I/Q multiplexing is equivalent to 16QAM) data, the transmission power of each time slot in the 2ms TTI is changed (up or down

Images