Power control method and device

A technology for power control and transmit power control, applied in power management, transmission control/equalization, code division multiplexing systems, etc., and can solve the decoding of dedicated control information, communication interruption, and deterioration of the reception quality of dedicated control channel information. And other issues

Inactive Publication Date: 2008-01-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In the case where the synchronization channel SCH and the dedicated communication channel DTCH overlap, only the audio quality is degraded, not fatal
However, when the synchronization channel SCH and the dedicated control channel DCCH overlap, sometimes the reception quality of the dedicated control channel information deteriorates, so that the dedicated control information cannot be decoded correctly, and a fatal situation of communication interruption will occur.

Method used

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Embodiment Construction

[0065] (A) Wireless interface in W-CDMA system

[0066]FIG. 1 is an explanatory diagram of a protocol structure of a radio interface in a W-CDMA system. It consists of three protocol layers: the physical layer (layer 1), the data link layer (layer 2), and the network layer (layer 3). Layer 2 is further divided into a MAC (Medium Access Control; Media Access Control) sublayer and an RLC (RadioLink Control: Radio Link Control) sublayer.

[0067] The channel of the wireless interface is composed of three layers: physical channel, transmission channel, and logical signal. A logical channel is a channel provided by the MAC sublayer to the RLC sublayer. It is classified according to the function and logical characteristics of the transmitted signal, and its characteristics are determined by the information content transmitted. The logical channels involved in the present invention are dedicated control channel DCCH and dedicated communication channel DTCH. The transport channel i...

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PUM

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Abstract

An open-loop power control unit of a transmission power controller checks whether a dedicated control channel (DCCH) is superimposed on a synchronous channel (SCH). If so, The open-loop power control unit suspends the normal open-loop power control processing, increases a target SIR by a sufficient level, and sends the increased target SIR to a closed-loop power control unit. The closed-loop power control unit holds the sent target SIR, and performs a closed-loop transmission power control processing according to the target SIR. The open-loop power control unit resumes the normal open-loop power control processing after DCCH reception.

Description

technical field [0001] The present invention relates to a power control method and device in W-CDMA, and more particularly to a power control method and device for changing the target quality for downlink transmission power control bit (TPC) generation in consideration of the positional relationship between a downlink dedicated control channel and a synchronization channel. Background technique [0002] In CDMA mobile communication, channels are distinguished according to spreading codes assigned to each channel, so that multiple channels share one frequency band for communication. However, in an actual mobile communication environment, since the delay caused by multipath fading spreads to radio waves from other cells, the received signal is interfered by this channel and other channels, and this interference adversely affects channel separation. In addition, the amount of interference received by a received signal varies with time due to instantaneous fluctuations in receiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B7/005H04J13/00H04W52/04H04W52/12H04W52/24H04W52/36
CPCH04W52/12H04W52/143H04W52/08H04W52/04H04L1/0025H04W52/24H04W52/10
Inventor 山野攻
Owner FUJITSU LTD
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