Signal-to-interference ratio adjustment method and terminal equipment based on tpc scheduling command

Abstract

The invention relates to the communication field, and discloses a signal-to-interference ratio adjustment method based on a TPC scheduling command and terminal equipment. In the present invention, by monitoring the TPC change in the outer loop power control action cycle, the detection and elimination of the wind up state are performed based on the method of continuous up-regulation and down-regulation of TPC. When it is determined to be in a non-windup state, the outer loop power control adjusts the SIR target value according to the comparison between the smoothed BLER value and the BLER target value; when it is determined to be in a windup state, the SIR target value is not adjusted. This avoids the problem that the SIR target value is too high when the link returns to normal from the wind up state, causing the transmitter to transmit power higher than the actual required value, causing greater interference to other users, and enhancing the current outer loop power control algorithm. robustness.

Description

technical field [0001] The invention relates to the communication field, in particular to a closed-loop power control technology in the communication field. Background technique [0002] The service provided by the wireless cellular network for each user needs to meet a certain quality of service (QoS), but the QoS is mainly determined by the Signal to Interference Ratio (SIR) of the signal received by each user. For Code Division Multiple Access (CDMA) cellular systems, all users in the same cell use the same frequency band and time slot, and users are isolated from each other only by the (quasi) orthogonal characteristics of spreading codes. However, due to the multipath and delay of the wireless channel, the cross-correlation characteristics between the signals of each user are not ideal, and the signals of other users interfere with the current user signal. This type of interference is called Multiple Access Interference (MAI). In this way, when the number of users in t...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a SIR adjustment method and terminal equipment based on TPC scheduling commands to solve the problem that the SIR target value is too high when the link is from power limited to normal, thereby effectively reducing When the quality returns to normal, the process of reducing the SIR target value to the normal value will cause interference to other users, which enhances the robustness of the current outer loop power control algorithm

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