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Transmission power control device and method

A technology of transmit power control and transmit power, applied in power management, transmission control/equalization, communication between multiple stations, etc. Quality deterioration, etc.

Inactive Publication Date: 2002-08-14
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] That is, at the moment when the mobile station device starts moving from a stationary state, the transmission environment surrounding the mobile station device changes from a quasi-static characteristic to a dynamic characteristic, so the signal quality deteriorates rapidly. In the SIR value, the required reception SIR value in the mobile state cannot be ensured, so the communication quality deteriorates
[0012] In such a case, if the target SIR value is set based on the long-term communication quality, the update of the target SIR value is not fast enough, and there is a problem that the transmission power control corresponding to the rapid deterioration of the communication quality cannot be performed.

Method used

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  • Transmission power control device and method
  • Transmission power control device and method
  • Transmission power control device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 A block diagram showing the configuration of a base station apparatus using the transmission power control apparatus according to Embodiment 1 of the present invention.

[0026] The feature of Embodiment 1 is that, when setting the target SIR value of the transmission power control, by shortening the update time constant in the increasing direction of the target SIR value, the transmission power control can be tracked at a high speed in a degraded transmission environment, thereby ensuring the required communication quality .

[0027] figure 1 The illustrated base station apparatus 100 includes an antenna 101, a transmission / reception signal separation unit 102, a radio reception unit 103, a despreading unit 104, a RAKE synthesis unit 105, a demodulation unit 106, a reception SIR measurement unit 107, and a target SIR value setting unit. 108 . SIR comparison / information generation unit 109 , target SIR value storage unit 110 , transmission power control infor...

Embodiment 2

[0057] Figure 5 A block diagram showing the configuration of a base station apparatus using the transmission power control apparatus according to Embodiment 2 of the present invention. Among them, in Figure 5 For and figure 1 The same part is appended with figure 1 The same reference numerals are used, and descriptions thereof are omitted.

[0058] The second embodiment is characterized in that, for a transmitting station whose signal quality fluctuates greatly due to large fluctuations in the transmission environment, by setting a lower limit in the setting of the target SIR value, the set target SIR value is not excessively lowered, even Even when the transmission environment deteriorates rapidly, the transmission power control can be effectively operated to ensure the required communication quality.

[0059] Figure 5 The base station device 500 shown with figure 1 The base station apparatus 100 differs in that, in addition to the constituent elements of the base st...

Embodiment 3

[0075] Figure 7 A block diagram showing the configuration of a base station apparatus using the transmission power control apparatus according to Embodiment 3 of the present invention. in, Figure 7 neutralize Figure 5 The same part is appended with Figure 5 The same reference numerals are used, and descriptions thereof are omitted.

[0076] The third embodiment is characterized in that, for a transmitting station with a large fluctuation range in moving speed, that is, a mobile station device at a transmitting end whose signal quality fluctuates greatly due to a large fluctuation in the transmission environment of the transmitting station, the The amplitude sets a lower limit in the setting of the target SIR value, and the transmission power control can be effectively operated to ensure the required communication quality without excessively lowering the set target SIR value even if the transmission environment deteriorates rapidly.

[0077] Figure 7 The base station ...

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Abstract

A received SIR value measurement section 107 measures a received SIR (desired signal to interference ratio) value. A target SIR value setting section 108 decreases a target SIR value by a predetermined first value if the quality of received data from a demodulation section 106 is better than the desired quality, or increases the target SIR value by a second value greater than the first value if the quality of the received data is poorer than the desired quality. An SIR comparison / information generating section 109 generates transmission power control information for implementing a directive to the transmitting station to increase or decrease transmission power so that a difference between the received SIR value and the set target SIR value is eliminated. By this means, it is possible to prevent delay in updating of the target SIR value and to assure communication quality even in a case where the propagation environment deteriorates rapidly, when target SIR value updating is carried out at the time of transmission power control by means of comparison between the received SIR value and target SIR value.

Description

technical field [0001] The present invention relates to a transmission power control device and transmission power applied to a mobile phone in a mobile communication system, a mobile station device such as an information terminal device having a mobile phone function and a computer function, or a base station device performing wireless communication with a mobile station device, etc. Control Method Background technique [0002] Conventionally, in a CDMA (Code Division Multiple Access: Code Division Multiple Access) mobile wireless communication cellular system, a mobile station device and a base station device jointly perform transmission power control in order to ensure sufficient communication quality in a receiving station device, and Do not cause excessive interference to other devices. [0003] Even in the transmission power control, in the method of controlling based on the desired signal power (the power of the desired signal after demodulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04B1/04H04B7/005H04B7/26H04J13/00H04W52/20H04W52/24H04W52/36
CPCH04W52/24H04W52/36Y02B60/50H04W52/282H04W52/12
Inventor 金本英树加藤修
Owner PANASONIC CORP